From 2f271a220a77704ae8aa96a3241065518b064072 Mon Sep 17 00:00:00 2001
From: Edward Shen <code@eddie.sh>
Date: Mon, 12 Jul 2021 16:35:17 -0400
Subject: [PATCH] remove tarpaulin-report

---
 tarpaulin-report.html | 660 ------------------------------------------
 1 file changed, 660 deletions(-)
 delete mode 100644 tarpaulin-report.html
diff --git a/tarpaulin-report.html b/tarpaulin-report.html
deleted file mode 100644
index 4c8e450..0000000
--- a/tarpaulin-report.html
+++ /dev/null
@@ -1,660 +0,0 @@
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These structs have alternative deserialize and serializations\n//! implementations to assist reading from the official client file format.\n\nuse std::str::FromStr;\n\nuse chrono::{DateTime, FixedOffset};\nuse serde::de::{Unexpected, Visitor};\nuse serde::{Deserialize, Serialize};\n\nuse super::ImageContentType;\n\n#[derive(Copy, Clone, Deserialize)]\npub struct LegacyImageMetadata {\n    pub(crate) content_type: Option\u003cLegacyImageContentType\u003e,\n    pub(crate) size: Option\u003cu32\u003e,\n    pub(crate) last_modified: Option\u003cLegacyDateTime\u003e,\n}\n\n#[derive(Copy, Clone, Serialize)]\npub struct LegacyDateTime(pub DateTime\u003cFixedOffset\u003e);\n\nimpl\u003c'de\u003e Deserialize\u003c'de\u003e for LegacyDateTime {\n    fn deserialize\u003cD\u003e(deserializer: D) -\u003e Result\u003cSelf, D::Error\u003e\n    where\n        D: serde::Deserializer\u003c'de\u003e,\n    {\n        struct LegacyDateTimeVisitor;\n\n        impl\u003c'de\u003e Visitor\u003c'de\u003e for LegacyDateTimeVisitor {\n            type Value = LegacyDateTime;\n\n            fn expecting(\u0026self, f: \u0026mut std::fmt::Formatter) -\u003e std::fmt::Result {\n                write!(f, \"a valid image type\")\n            }\n\n            fn visit_str\u003cE\u003e(self, v: \u0026str) -\u003e Result\u003cSelf::Value, E\u003e\n            where\n                E: serde::de::Error,\n            {\n                DateTime::parse_from_rfc2822(v)\n                    .map(LegacyDateTime)\n                    .map_err(|_| E::invalid_value(Unexpected::Str(v), \u0026\"a valid image type\"))\n            }\n        }\n\n        deserializer.deserialize_str(LegacyDateTimeVisitor)\n    }\n}\n\n#[derive(Copy, Clone)]\npub struct LegacyImageContentType(pub ImageContentType);\n\nimpl\u003c'de\u003e Deserialize\u003c'de\u003e for LegacyImageContentType {\n    fn deserialize\u003cD\u003e(deserializer: D) -\u003e Result\u003cSelf, D::Error\u003e\n    where\n        D: serde::Deserializer\u003c'de\u003e,\n    {\n        struct LegacyImageContentTypeVisitor;\n\n        impl\u003c'de\u003e Visitor\u003c'de\u003e for LegacyImageContentTypeVisitor {\n            type Value = LegacyImageContentType;\n\n            fn expecting(\u0026self, f: \u0026mut std::fmt::Formatter) -\u003e std::fmt::Result {\n                write!(f, \"a valid image type\")\n            }\n\n            fn visit_str\u003cE\u003e(self, v: \u0026str) -\u003e Result\u003cSelf::Value, E\u003e\n            where\n                E: serde::de::Error,\n            {\n                ImageContentType::from_str(v)\n                    .map(LegacyImageContentType)\n                    .map_err(|_| E::invalid_value(Unexpected::Str(v), \u0026\"a valid image type\"))\n            }\n        }\n\n        deserializer.deserialize_str(LegacyImageContentTypeVisitor)\n    }\n}\n","traces":[{"line":23,"address":[4324992],"length":1,"stats":{"Line":1},"fn_name":"deserialize\u003c\u0026mut serde_json::de::Deserializer\u003cserde_json::read::IoRead\u003cstd::fs::File\u003e\u003e\u003e"},{"line":29,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":30,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":32,"address":[4325024],"length":1,"stats":{"Line":0},"fn_name":"expecting"},{"line":33,"address":[4325043],"length":1,"stats":{"Line":0},"fn_name":null},{"line":36,"address":[4325120],"length":1,"stats":{"Line":1},"fn_name":"visit_str\u003cserde_json::error::Error\u003e"},{"line":40,"address":[4325195,4325144],"length":1,"stats":{"Line":2},"fn_name":null},{"line":41,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":42,"address":[4325232,4325248,4325185],"length":1,"stats":{"Line":1},"fn_name":"{{closure}}\u003cserde_json::error::Error\u003e"},{"line":46,"address":[4325009],"length":1,"stats":{"Line":1},"fn_name":null},{"line":54,"address":[4325312],"length":1,"stats":{"Line":1},"fn_name":"deserialize\u003c\u0026mut serde_json::de::Deserializer\u003cserde_json::read::IoRead\u003cstd::fs::File\u003e\u003e\u003e"},{"line":60,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":61,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":63,"address":[4325376],"length":1,"stats":{"Line":0},"fn_name":"expecting"},{"line":64,"address":[4325395],"length":1,"stats":{"Line":0},"fn_name":null},{"line":67,"address":[4325472],"length":1,"stats":{"Line":1},"fn_name":"visit_str\u003cserde_json::error::Error\u003e"},{"line":71,"address":[4325486,4325535],"length":1,"stats":{"Line":2},"fn_name":null},{"line":72,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":73,"address":[4325609,4325600,4325530],"length":1,"stats":{"Line":1},"fn_name":"{{closure}}\u003cserde_json::error::Error\u003e"},{"line":77,"address":[4325321],"length":1,"stats":{"Line":1},"fn_name":null}],"covered":10,"coverable":20},{"path":["/","home","edward","Documents","repos","mangadex-home","src","cache","disk.rs"],"content":"//! Low memory caching stuff\n\nuse std::convert::TryFrom;\nuse std::hint::unreachable_unchecked;\nuse std::os::unix::prelude::OsStrExt;\nuse std::path::{Path, PathBuf};\nuse std::str::FromStr;\nuse std::sync::atomic::{AtomicU64, Ordering};\nuse std::sync::Arc;\n\nuse async_trait::async_trait;\nuse futures::StreamExt;\nuse log::{debug, error, warn, LevelFilter};\nuse md5::digest::generic_array::GenericArray;\nuse md5::{Digest, Md5};\nuse sqlx::sqlite::SqliteConnectOptions;\nuse sqlx::{ConnectOptions, Sqlite, SqlitePool, Transaction};\nuse tokio::fs::remove_file;\nuse tokio::sync::mpsc::{channel, Receiver, Sender};\nuse tokio_stream::wrappers::ReceiverStream;\n\nuse crate::units::Bytes;\n\nuse super::{Cache, CacheError, CacheKey, CacheStream, CallbackCache, ImageMetadata};\n\npub struct DiskCache {\n    disk_path: PathBuf,\n    disk_cur_size: AtomicU64,\n    db_update_channel_sender: Sender\u003cDbMessage\u003e,\n}\n\nenum DbMessage {\n    Get(Arc\u003cPathBuf\u003e),\n    Put(Arc\u003cPathBuf\u003e, u64),\n}\n\nimpl DiskCache {\n    /// Constructs a new low memory cache at the provided path and capacity.\n    /// This internally spawns a task that will wait for filesystem\n    /// notifications when a file has been written.\n    pub async fn new(disk_max_size: Bytes, disk_path: PathBuf) -\u003e Arc\u003cSelf\u003e {\n        let (db_tx, db_rx) = channel(128);\n        let db_pool = {\n            let db_url = format!(\"sqlite:{}/metadata.sqlite\", disk_path.to_string_lossy());\n            let mut options = SqliteConnectOptions::from_str(\u0026db_url)\n                .unwrap()\n                .create_if_missing(true);\n            options.log_statements(LevelFilter::Trace);\n            let db = SqlitePool::connect_with(options).await.unwrap();\n\n            // Run db init\n            sqlx::query_file!(\"./db_queries/init.sql\")\n                .execute(\u0026mut db.acquire().await.unwrap())\n                .await\n                .unwrap();\n\n            db\n        };\n\n        // This is intentional.\n        #[allow(clippy::cast_sign_loss)]\n        let disk_cur_size = {\n            let mut conn = db_pool.acquire().await.unwrap();\n            sqlx::query!(\"SELECT IFNULL(SUM(size), 0) AS size FROM Images\")\n                .fetch_one(\u0026mut conn)\n                .await\n                .map(|record| record.size)\n                .unwrap_or_default()\n                .unwrap_or_default() as u64\n        };\n\n        let new_self = Arc::new(Self {\n            disk_path,\n            disk_cur_size: AtomicU64::new(disk_cur_size),\n            db_update_channel_sender: db_tx,\n        });\n\n        // maybe this is better? in theory this sounds like it should be faster\n        // but in practice I haven't seen any perf improvements\n\n        // let ret = Arc::clone(\u0026new_self);\n        // std::thread::spawn(move || {\n        //     tokio::runtime::Builder::new_current_thread()\n        //         .enable_all()\n        //         .build()\n        //         .unwrap()\n        //         .block_on(db_listener(\n        //             Arc::clone(\u0026new_self),\n        //             db_rx,\n        //             db_pool,\n        //             disk_max_size.get() as u64 / 20 * 19,\n        //         ))\n        // });\n        // ret\n\n        tokio::spawn(db_listener(\n            Arc::clone(\u0026new_self),\n            db_rx,\n            db_pool,\n            disk_max_size.get() as u64 / 20 * 19,\n        ));\n\n        new_self\n    }\n\n    #[cfg(test)]\n    fn in_memory() -\u003e (Self, Receiver\u003cDbMessage\u003e) {\n        let (db_tx, db_rx) = channel(128);\n        (\n            Self {\n                disk_path: PathBuf::new(),\n                disk_cur_size: AtomicU64::new(0),\n                db_update_channel_sender: db_tx,\n            },\n            db_rx,\n        )\n    }\n}\n\n/// Spawn a new task that will listen for updates to the db, pruning if the size\n/// becomes too large.\nasync fn db_listener(\n    cache: Arc\u003cDiskCache\u003e,\n    db_rx: Receiver\u003cDbMessage\u003e,\n    db_pool: SqlitePool,\n    max_on_disk_size: u64,\n) {\n    let mut recv_stream = ReceiverStream::new(db_rx).ready_chunks(128);\n    while let Some(messages) = recv_stream.next().await {\n        let mut transaction = match db_pool.begin().await {\n            Ok(transaction) =\u003e transaction,\n            Err(e) =\u003e {\n                error!(\"Failed to start a transaction to DB, cannot update DB. Disk cache may be losing track of files! {}\", e);\n                continue;\n            }\n        };\n\n        for message in messages {\n            match message {\n                DbMessage::Get(entry) =\u003e handle_db_get(\u0026entry, \u0026mut transaction).await,\n                DbMessage::Put(entry, size) =\u003e {\n                    handle_db_put(\u0026entry, size, \u0026cache, \u0026mut transaction).await;\n                }\n            }\n        }\n\n        if let Err(e) = transaction.commit().await {\n            error!(\n                \"Failed to commit transaction to DB. Disk cache may be losing track of files! {}\",\n                e\n            );\n        }\n\n        let on_disk_size = (cache.disk_cur_size.load(Ordering::Acquire) + 4095) / 4096 * 4096;\n        if on_disk_size \u003e= max_on_disk_size {\n            let mut conn = match db_pool.acquire().await {\n                Ok(conn) =\u003e conn,\n                Err(e) =\u003e {\n                    error!(\n                        \"Failed to get a DB connection and cannot prune disk cache: {}\",\n                        e\n                    );\n                    continue;\n                }\n            };\n\n            let items = {\n                let request =\n                    sqlx::query!(\"select id, size from Images order by accessed asc limit 1000\")\n                        .fetch_all(\u0026mut conn)\n                        .await;\n                match request {\n                    Ok(items) =\u003e items,\n                    Err(e) =\u003e {\n                        error!(\n                            \"Failed to fetch oldest images and cannot prune disk cache: {}\",\n                            e\n                        );\n                        continue;\n                    }\n                }\n            };\n\n            let mut size_freed = 0;\n            #[allow(clippy::cast_sign_loss)]\n            for item in items {\n                debug!(\"deleting file due to exceeding cache size\");\n                size_freed += item.size as u64;\n                tokio::spawn(async move {\n                    let key = item.id;\n                    if let Err(e) = remove_file(key.clone()).await {\n                        match e.kind() {\n                            std::io::ErrorKind::NotFound =\u003e {\n                                let hash = Md5Hash(*GenericArray::from_slice(key.as_bytes()));\n                                let path: PathBuf = hash.into();\n                                if let Err(e) = remove_file(\u0026path).await {\n                                    warn!(\n                                        \"Failed to delete file `{}` from cache: {}\",\n                                        path.to_string_lossy(),\n                                        e\n                                    );\n                                }\n                            }\n                            _ =\u003e {\n                                warn!(\"Failed to delete file `{}` from cache: {}\", \u0026key, e);\n                            }\n                        }\n                    }\n                });\n            }\n\n            cache.disk_cur_size.fetch_sub(size_freed, Ordering::Release);\n        }\n    }\n}\n\nasync fn handle_db_get(entry: \u0026Path, transaction: \u0026mut Transaction\u003c'_, Sqlite\u003e) {\n    let hash = if let Ok(hash) = Md5Hash::try_from(entry) {\n        hash\n    } else {\n        error!(\n            \"Failed to derive hash from entry, dropping message: {}\",\n            entry.to_string_lossy()\n        );\n        return;\n    };\n\n    let hash_str = hash.to_hex_string();\n    let key = entry.as_os_str().to_str();\n    let now = chrono::Utc::now();\n    let query = sqlx::query!(\n        \"update Images set accessed = ? where id = ? or id = ?\",\n        now,\n        key,\n        hash_str\n    )\n    .execute(transaction)\n    .await;\n    if let Err(e) = query {\n        warn!(\"Failed to update timestamp in db for {:?}: {}\", key, e);\n    }\n}\n\nasync fn handle_db_put(\n    entry: \u0026Path,\n    size: u64,\n    cache: \u0026DiskCache,\n    transaction: \u0026mut Transaction\u003c'_, Sqlite\u003e,\n) {\n    let key = entry.as_os_str().to_str();\n    let now = chrono::Utc::now();\n\n    // This is intentional.\n    #[allow(clippy::cast_possible_wrap)]\n    let casted_size = size as i64;\n    let query = sqlx::query!(\n        \"insert into Images (id, size, accessed) values (?, ?, ?) on conflict do nothing\",\n        key,\n        casted_size,\n        now,\n    )\n    .execute(transaction)\n    .await;\n\n    if let Err(e) = query {\n        warn!(\"Failed to add {:?} to db: {}\", key, e);\n    }\n\n    cache.disk_cur_size.fetch_add(size, Ordering::Release);\n}\n\n/// Represents a Md5 hash that can be converted to and from a path. This is used\n/// for compatibility with the official client, where the image id and on-disk\n/// path is determined by file path.\n#[derive(Clone, Copy, PartialEq, Eq, Debug)]\nstruct Md5Hash(GenericArray\u003cu8, \u003cMd5 as md5::Digest\u003e::OutputSize\u003e);\n\nimpl Md5Hash {\n    fn to_hex_string(self) -\u003e String {\n        format!(\"{:x}\", self.0)\n    }\n}\n\nimpl TryFrom\u003c\u0026Path\u003e for Md5Hash {\n    type Error = ();\n\n    fn try_from(path: \u0026Path) -\u003e Result\u003cSelf, Self::Error\u003e {\n        let mut iter = path.iter();\n        let file_name = iter.next_back().ok_or(())?;\n        let chapter_hash = iter.next_back().ok_or(())?;\n        let is_data_saver = iter.next_back().ok_or(())? == \"saver\";\n        let mut hasher = Md5::new();\n        if is_data_saver {\n            hasher.update(\"saver\");\n        }\n        hasher.update(chapter_hash.as_bytes());\n        hasher.update(\".\");\n        hasher.update(file_name.as_bytes());\n        Ok(Self(hasher.finalize()))\n    }\n}\n\nimpl From\u003cMd5Hash\u003e for PathBuf {\n    fn from(hash: Md5Hash) -\u003e Self {\n        let hex_value = dbg!(hash.to_hex_string());\n        let path = hex_value[0..3]\n            .chars()\n            .rev()\n            .map(|char| Self::from(char.to_string()))\n            .reduce(|first, second| first.join(second));\n\n        match path {\n            Some(p) =\u003e p.join(hex_value),\n            None =\u003e unsafe { unreachable_unchecked() }, // literally not possible\n        }\n    }\n}\n\n#[async_trait]\nimpl Cache for DiskCache {\n    async fn get(\n        \u0026self,\n        key: \u0026CacheKey,\n    ) -\u003e Option\u003cResult\u003c(CacheStream, ImageMetadata), CacheError\u003e\u003e {\n        let channel = self.db_update_channel_sender.clone();\n\n        let path = Arc::new(self.disk_path.clone().join(PathBuf::from(key)));\n        let path_0 = Arc::clone(\u0026path);\n\n        tokio::spawn(async move { channel.send(DbMessage::Get(path_0)).await });\n\n        super::fs::read_file_from_path(\u0026path).await.map(|res| {\n            let (inner, maybe_header, metadata) = res?;\n            CacheStream::new(inner, maybe_header)\n                .map(|stream| (stream, metadata))\n                .map_err(|_| CacheError::DecryptionFailure)\n        })\n    }\n\n    async fn put(\n        \u0026self,\n        key: CacheKey,\n        image: bytes::Bytes,\n        metadata: ImageMetadata,\n    ) -\u003e Result\u003c(), CacheError\u003e {\n        let channel = self.db_update_channel_sender.clone();\n\n        let path = Arc::new(self.disk_path.clone().join(PathBuf::from(\u0026key)));\n        let path_0 = Arc::clone(\u0026path);\n\n        let db_callback = |size: u64| async move {\n            std::mem::drop(channel.send(DbMessage::Put(path_0, size)).await);\n        };\n\n        super::fs::write_file(\u0026path, key, image, metadata, db_callback, None)\n            .await\n            .map_err(CacheError::from)\n    }\n}\n\n#[async_trait]\nimpl CallbackCache for DiskCache {\n    async fn put_with_on_completed_callback(\n        \u0026self,\n        key: CacheKey,\n        image: bytes::Bytes,\n        metadata: ImageMetadata,\n        on_complete: Sender\u003c(CacheKey, bytes::Bytes, ImageMetadata, u64)\u003e,\n    ) -\u003e Result\u003c(), CacheError\u003e {\n        let channel = self.db_update_channel_sender.clone();\n\n        let path = Arc::new(self.disk_path.clone().join(PathBuf::from(\u0026key)));\n        let path_0 = Arc::clone(\u0026path);\n\n        let db_callback = |size: u64| async move {\n            // We don't care about the result of the send\n            std::mem::drop(channel.send(DbMessage::Put(path_0, size)).await);\n        };\n\n        super::fs::write_file(\u0026path, key, image, metadata, db_callback, Some(on_complete))\n            .await\n            .map_err(CacheError::from)\n    }\n}\n\n#[cfg(test)]\nmod db {\n    use chrono::{DateTime, Utc};\n    use sqlx::{Connection, Row, SqliteConnection};\n    use std::error::Error;\n\n    use super::*;\n\n    #[tokio::test]\n    async fn get() -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n        let (cache, _) = DiskCache::in_memory();\n        let path = PathBuf::from_str(\"a/b/c\")?;\n        let mut conn = SqliteConnection::connect(\"sqlite::memory:\").await?;\n        sqlx::query_file!(\"./db_queries/init.sql\")\n            .execute(\u0026mut conn)\n            .await?;\n\n        // Add an entry\n        let mut transaction = conn.begin().await?;\n        handle_db_put(\u0026path, 10, \u0026cache, \u0026mut transaction).await;\n        transaction.commit().await?;\n\n        let time_fence = Utc::now();\n\n        let mut transaction = conn.begin().await?;\n        handle_db_get(\u0026path, \u0026mut transaction).await;\n        transaction.commit().await?;\n\n        let mut rows: Vec\u003c_\u003e = sqlx::query(\"select * from Images\")\n            .fetch(\u0026mut conn)\n            .collect()\n            .await;\n        assert_eq!(rows.len(), 1);\n        let entry = rows.pop().unwrap()?;\n        assert!(time_fence \u003c entry.get::\u003c'_, DateTime\u003cUtc\u003e, _\u003e(\"accessed\"));\n\n        Ok(())\n    }\n\n    #[tokio::test]\n    async fn put() -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n        let (cache, _) = DiskCache::in_memory();\n        let path = PathBuf::from_str(\"a/b/c\")?;\n        let mut conn = SqliteConnection::connect(\"sqlite::memory:\").await?;\n        sqlx::query_file!(\"./db_queries/init.sql\")\n            .execute(\u0026mut conn)\n            .await?;\n\n        let mut transaction = conn.begin().await?;\n        let transaction_time = Utc::now();\n        handle_db_put(\u0026path, 10, \u0026cache, \u0026mut transaction).await;\n        transaction.commit().await?;\n\n        let mut rows: Vec\u003c_\u003e = sqlx::query(\"select * from Images\")\n            .fetch(\u0026mut conn)\n            .collect()\n            .await;\n        assert_eq!(rows.len(), 1);\n\n        let entry = rows.pop().unwrap()?;\n        assert_eq!(entry.get::\u003c'_, \u0026str, _\u003e(\"id\"), \"a/b/c\");\n        assert_eq!(entry.get::\u003c'_, i64, _\u003e(\"size\"), 10);\n\n        let accessed: DateTime\u003cUtc\u003e = entry.get(\"accessed\");\n        assert!(transaction_time \u003c accessed);\n        assert!(accessed \u003c Utc::now());\n\n        assert_eq!(cache.disk_cur_size.load(Ordering::SeqCst), 10);\n\n        Ok(())\n    }\n}\n\n#[cfg(test)]\nmod md5_hash {\n    use super::*;\n\n    #[test]\n    fn to_cache_path() {\n        let hash = Md5Hash(\n            *GenericArray::\u003c_, \u003cMd5 as md5::Digest\u003e::OutputSize\u003e::from_slice(\u0026[\n                0xab, 0xcd, 0xef, 0xab, 0xcd, 0xef, 0xab, 0xcd, 0xef, 0xab, 0xcd, 0xef, 0xab, 0xcd,\n                0xef, 0xab,\n            ]),\n        );\n        assert_eq!(\n            PathBuf::from(hash).to_str(),\n            Some(\"c/b/a/abcdefabcdefabcdefabcdefabcdefab\")\n        )\n    }\n\n    #[test]\n    fn from_data_path() {\n        let mut expected_hasher = Md5::new();\n        expected_hasher.update(\"foo.bar.png\");\n        assert_eq!(\n            Md5Hash::try_from(Path::new(\"data/foo/bar.png\")),\n            Ok(Md5Hash(expected_hasher.finalize()))\n        );\n    }\n\n    #[test]\n    fn from_data_saver_path() {\n        let mut expected_hasher = Md5::new();\n        expected_hasher.update(\"saverfoo.bar.png\");\n        assert_eq!(\n            Md5Hash::try_from(Path::new(\"saver/foo/bar.png\")),\n            Ok(Md5Hash(expected_hasher.finalize()))\n        );\n    }\n\n    #[test]\n    fn can_handle_long_paths() {\n        assert_eq!(\n            Md5Hash::try_from(Path::new(\"a/b/c/d/e/f/g/saver/foo/bar.png\")),\n            Md5Hash::try_from(Path::new(\"saver/foo/bar.png\")),\n        );\n    }\n\n    #[test]\n    fn from_invalid_paths() {\n        assert!(Md5Hash::try_from(Path::new(\"foo/bar.png\")).is_err());\n        assert!(Md5Hash::try_from(Path::new(\"bar.png\")).is_err());\n        assert!(Md5Hash::try_from(Path::new(\"\")).is_err());\n    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This module contains two functions whose sole purpose is to allow a single\n//! producer multiple consumer (SPMC) system using the filesystem as an\n//! intermediate.\n//!\n//! Consider the scenario where two clients, A and B, request the same uncached\n//! file, one after the other. In a typical caching system, both requests would\n//! result in a cache miss, and both requests would then be proxied from\n//! upstream. But, we can do better. We know that by the time one request\n//! begins, there should be a file on disk for us to read from. Why require\n//! subsequent requests to read from upstream, when we can simply fetch one and\n//! read from the filesystem that we know will have the exact same data?\n//! Instead, we can just read from the filesystem and just inform all readers\n//! when the file is done. This is beneficial to both downstream and upstream as\n//! upstream no longer needs to process duplicate requests and sequential cache\n//! misses are treated as closer as a cache hit.\n\nuse std::error::Error;\nuse std::fmt::Display;\nuse std::io::{Seek, SeekFrom};\nuse std::path::Path;\nuse std::pin::Pin;\nuse std::task::{Context, Poll};\n\nuse actix_web::error::PayloadError;\nuse bytes::Bytes;\nuse futures::Future;\nuse log::{debug, warn};\nuse serde::{Deserialize, Serialize};\nuse sodiumoxide::crypto::secretstream::{\n    Header, Pull, Push, Stream as SecretStream, Tag, HEADERBYTES,\n};\nuse tokio::fs::{create_dir_all, remove_file, File};\nuse tokio::io::{AsyncRead, AsyncReadExt, AsyncSeekExt, AsyncWrite, AsyncWriteExt, ReadBuf};\nuse tokio::sync::mpsc::Sender;\nuse tokio_util::codec::{BytesCodec, FramedRead};\n\nuse super::compat::LegacyImageMetadata;\nuse super::{CacheKey, ImageMetadata, InnerStream, ENCRYPTION_KEY};\n\n#[derive(Serialize, Deserialize)]\npub enum OnDiskMetadata {\n    Encrypted(Header, ImageMetadata),\n    Plaintext(ImageMetadata),\n}\n\n/// Attempts to lookup the file on disk, returning a byte stream if it exists.\n/// Note that this could return two types of streams, depending on if the file\n/// is in progress of being written to.\n#[inline]\npub(super) async fn read_file_from_path(\n    path: \u0026Path,\n) -\u003e Option\u003cResult\u003c(InnerStream, Option\u003cHeader\u003e, ImageMetadata), std::io::Error\u003e\u003e {\n    read_file(std::fs::File::open(path).ok()?).await\n}\n\nasync fn read_file(\n    file: std::fs::File,\n) -\u003e Option\u003cResult\u003c(InnerStream, Option\u003cHeader\u003e, ImageMetadata), std::io::Error\u003e\u003e {\n    let mut file_0 = file.try_clone().unwrap();\n    let file_1 = file.try_clone().unwrap();\n\n    // Try reading decrypted header first...\n    let mut deserializer = serde_json::Deserializer::from_reader(file);\n    let mut maybe_metadata = ImageMetadata::deserialize(\u0026mut deserializer);\n\n    // Failed to parse normally, see if we have a legacy file format\n    if maybe_metadata.is_err() {\n        file_0.seek(SeekFrom::Start(2)).ok()?;\n        let mut deserializer = serde_json::Deserializer::from_reader(file_0);\n        maybe_metadata =\n            LegacyImageMetadata::deserialize(\u0026mut deserializer).map(LegacyImageMetadata::into);\n    }\n\n    let parsed_metadata;\n    let mut maybe_header = None;\n    let mut reader: Option\u003cPin\u003cBox\u003cdyn AsyncRead + Send\u003e\u003e\u003e = None;\n    if let Ok(metadata) = maybe_metadata {\n        // image is decrypted\n        if ENCRYPTION_KEY.get().is_some() {\n            // invalidate cache since we're running in at-rest encryption and\n            // the file wasn't encrypted.\n            warn!(\"Found file but was not encrypted!\");\n            return None;\n        }\n\n        reader = Some(Box::pin(File::from_std(file_1)));\n        parsed_metadata = Some(metadata);\n        debug!(\"Found not encrypted file\");\n    } else {\n        let mut file = File::from_std(file_1);\n        file.seek(SeekFrom::Start(0)).await.ok()?;\n        let file_0 = file.try_clone().await.unwrap();\n\n        // image is encrypted or corrupt\n\n        // If the encryption key was set, use the encrypted disk reader instead;\n        // else, just directly read from file.\n        if let Some(key) = ENCRYPTION_KEY.get() {\n            let mut header_bytes = [0; HEADERBYTES];\n            if let Err(e) = file.read_exact(\u0026mut header_bytes).await {\n                warn!(\"Found file but failed reading header: {}\", e);\n                return None;\n            }\n\n            let file_header = if let Some(header) = Header::from_slice(\u0026header_bytes) {\n                header\n            } else {\n                warn!(\"Found file, but encrypted header was invalid. Assuming corrupted!\");\n                return None;\n            };\n\n            let secret_stream = if let Ok(stream) = SecretStream::init_pull(\u0026file_header, key) {\n                stream\n            } else {\n                warn!(\"Failed to init secret stream with key and header. Assuming corrupted!\");\n                return None;\n            };\n\n            maybe_header = Some(file_header);\n\n            reader = Some(Box::pin(EncryptedDiskReader::new(file, secret_stream)));\n        }\n\n        let mut deserializer = serde_json::Deserializer::from_reader(file_0.into_std().await);\n        parsed_metadata = ImageMetadata::deserialize(\u0026mut deserializer).ok();\n\n        if parsed_metadata.is_some() {\n            debug!(\"Found encrypted file\");\n        }\n    }\n\n    // parsed_metadata is either set or unset here. If it's set then we\n    // successfully decoded the data; otherwise the file is garbage.\n\n    if let Some(reader) = reader {\n        let stream = InnerStream::Completed(FramedRead::new(reader, BytesCodec::new()));\n        parsed_metadata.map(|metadata| Ok((stream, maybe_header, metadata)))\n    } else {\n        debug!(\"Reader was invalid, file is corrupt\");\n        None\n    }\n}\n\nstruct EncryptedDiskReader {\n    file: Pin\u003cBox\u003cFile\u003e\u003e,\n    stream: SecretStream\u003cPull\u003e,\n    buf: Vec\u003cu8\u003e,\n}\n\nimpl EncryptedDiskReader {\n    fn new(file: File, stream: SecretStream\u003cPull\u003e) -\u003e Self {\n        Self {\n            file: Box::pin(file),\n            stream,\n            buf: vec![],\n        }\n    }\n}\n\nimpl AsyncRead for EncryptedDiskReader {\n    fn poll_read(\n        mut self: Pin\u003c\u0026mut Self\u003e,\n        cx: \u0026mut Context\u003c'_\u003e,\n        buf: \u0026mut ReadBuf\u003c'_\u003e,\n    ) -\u003e Poll\u003cstd::io::Result\u003c()\u003e\u003e {\n        let cursor_start = buf.filled().len();\n\n        let res = self.as_mut().file.as_mut().poll_read(cx, buf);\n        if res.is_pending() {\n            return Poll::Pending;\n        }\n\n        let cursor_new = buf.filled().len();\n\n        // pull_to_vec internally calls vec.clear() and vec.reserve(). Generally\n        // speaking we should be reading about the same amount of data each time\n        // so we shouldn't experience too much of a slow down w.r.t resizing the\n        // buffer...\n        let new_self = Pin::into_inner(self);\n        new_self\n            .stream\n            .pull_to_vec(\n                \u0026buf.filled()[cursor_start..cursor_new],\n                None,\n                \u0026mut new_self.buf,\n            )\n            .unwrap();\n\n        // data is strictly smaller than the encrypted stream, since you need to\n        // encode tags as well, so this is always safe.\n\n        // rewrite encrypted data into decrypted data\n        let buffer = buf.filled_mut();\n        for (old, new) in buffer[cursor_start..].iter_mut().zip(\u0026new_self.buf) {\n            *old = *new;\n        }\n        buf.set_filled(cursor_start + new_self.buf.len());\n\n        res\n    }\n}\n\n/// Writes the metadata and input stream (in that order) to a file, returning a\n/// stream that reads from that file. Accepts a db callback function that is\n/// provided the number of bytes written, and an optional on-complete callback\n/// that is called with a completed cache entry.\npub(super) async fn write_file\u003cFut, DbCallback\u003e(\n    path: \u0026Path,\n    cache_key: CacheKey,\n    bytes: Bytes,\n    metadata: ImageMetadata,\n    db_callback: DbCallback,\n    on_complete: Option\u003cSender\u003c(CacheKey, Bytes, ImageMetadata, u64)\u003e\u003e,\n) -\u003e Result\u003c(), std::io::Error\u003e\nwhere\n    Fut: 'static + Send + Sync + Future\u003cOutput = ()\u003e,\n    DbCallback: 'static + Send + Sync + FnOnce(u64) -\u003e Fut,\n{\n    let file = {\n        let parent = path.parent().expect(\"The path to have a parent\");\n        create_dir_all(parent).await?;\n        let file = File::create(path).await?; // we need to make sure the file exists and is truncated.\n        file\n    };\n\n    let metadata_string = serde_json::to_string(\u0026metadata).expect(\"serialization to work\");\n    let metadata_size = metadata_string.len();\n\n    let (mut writer, maybe_header): (Pin\u003cBox\u003cdyn AsyncWrite + Send\u003e\u003e, _) =\n        if let Some((enc, header)) = ENCRYPTION_KEY\n            .get()\n            .map(|key| SecretStream::init_push(key).expect(\"Failed to init enc stream\"))\n        {\n            (Box::pin(EncryptedDiskWriter::new(file, enc)), Some(header))\n        } else {\n            (Box::pin(file), None)\n        };\n\n    let mut error = if let Some(header) = maybe_header {\n        writer.write_all(header.as_ref()).await.err()\n    } else {\n        None\n    };\n\n    if error.is_none() {\n        error = writer.write_all(metadata_string.as_bytes()).await.err();\n    }\n    if error.is_none() {\n        error = writer.write_all(\u0026bytes).await.err();\n    }\n\n    if let Some(e) = error {\n        // It's ok if the deleting the file fails, since we truncate on\n        // create anyways, but it should be best effort.\n        //\n        // We don't care about the result of the call.\n        std::mem::drop(remove_file(path).await);\n        return Err(e);\n    }\n\n    writer.flush().await?;\n    debug!(\"writing to file done\");\n\n    let bytes_written = (metadata_size + bytes.len()) as u64;\n    tokio::spawn(db_callback(bytes_written));\n\n    if let Some(sender) = on_complete {\n        tokio::spawn(async move {\n            sender\n                .send((cache_key, bytes, metadata, bytes_written))\n                .await\n        });\n    }\n\n    Ok(())\n}\n\nstruct EncryptedDiskWriter {\n    file: Pin\u003cBox\u003cFile\u003e\u003e,\n    stream: Option\u003cSecretStream\u003cPush\u003e\u003e,\n    encryption_buffer: Vec\u003cu8\u003e,\n    write_buffer: Vec\u003cu8\u003e,\n}\n\nimpl EncryptedDiskWriter {\n    fn new(file: File, stream: SecretStream\u003cPush\u003e) -\u003e Self {\n        Self {\n            file: Box::pin(file),\n            stream: Some(stream),\n            encryption_buffer: vec![],\n            write_buffer: vec![],\n        }\n    }\n}\n\nimpl AsyncWrite for EncryptedDiskWriter {\n    fn poll_write(\n        self: Pin\u003c\u0026mut Self\u003e,\n        cx: \u0026mut Context\u003c'_\u003e,\n        buf: \u0026[u8],\n    ) -\u003e Poll\u003cResult\u003cusize, std::io::Error\u003e\u003e {\n        let new_self = Pin::into_inner(self);\n        {\n            let encryption_buffer = \u0026mut new_self.encryption_buffer;\n            if let Some(stream) = new_self.stream.as_mut() {\n                stream\n                    .push_to_vec(buf, None, Tag::Message, encryption_buffer)\n                    .expect(\"Failed to write encrypted data to buffer\");\n            }\n        }\n\n        new_self.write_buffer.extend(\u0026new_self.encryption_buffer);\n\n        match new_self\n            .file\n            .as_mut()\n            .poll_write(cx, \u0026new_self.write_buffer)\n        {\n            Poll::Ready(Ok(n)) =\u003e {\n                new_self.write_buffer.drain(..n);\n                // We buffered all the bytes that were provided to use.\n                Poll::Ready(Ok(buf.len()))\n            }\n            poll =\u003e poll,\n        }\n    }\n\n    fn poll_flush(\n        mut self: Pin\u003c\u0026mut Self\u003e,\n        cx: \u0026mut Context\u003c'_\u003e,\n    ) -\u003e Poll\u003cResult\u003c(), std::io::Error\u003e\u003e {\n        if self.as_ref().write_buffer.is_empty() {\n            self.file.as_mut().poll_flush(cx)\n        } else {\n            let new_self = Pin::into_inner(self);\n            let buffer = new_self.write_buffer.as_ref();\n            match new_self.file.as_mut().poll_write(cx, buffer) {\n                Poll::Ready(res) =\u003e {\n                    let n = res?;\n                    new_self.write_buffer.drain(..n);\n                    // We're immediately ready to do some more flushing!\n                    cx.waker().wake_by_ref();\n                    // Return pending here because we still need to flush the\n                    // file\n                    Poll::Pending\n                }\n                Poll::Pending =\u003e Poll::Pending,\n            }\n        }\n    }\n\n    fn poll_shutdown(\n        mut self: Pin\u003c\u0026mut Self\u003e,\n        cx: \u0026mut Context\u003c'_\u003e,\n    ) -\u003e Poll\u003cResult\u003c(), std::io::Error\u003e\u003e {\n        self.as_mut()\n            .stream\n            .take()\n            .map(|stream| stream.finalize(None));\n        self.file.as_mut().poll_shutdown(cx)\n    }\n}\n\n/// Represents some upstream error.\n#[derive(Debug, PartialEq, Eq)]\npub struct UpstreamError;\n\nimpl Error for UpstreamError {}\n\nimpl Display for UpstreamError {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        write!(f, \"An upstream error occurred\")\n    }\n}\n\nimpl From\u003cUpstreamError\u003e for actix_web::Error {\n    #[inline]\n    fn from(_: UpstreamError) -\u003e Self {\n        PayloadError::Incomplete(None).into()\n    }\n}\n\n#[cfg(test)]\nmod read_file {\n    use crate::cache::{ImageContentType, ImageMetadata};\n\n    use super::read_file;\n    use bytes::Bytes;\n    use chrono::DateTime;\n    use futures::StreamExt;\n    use std::io::{Seek, SeekFrom, Write};\n    use tempfile::tempfile;\n\n    #[tokio::test]\n    async fn can_read() {\n        let mut temp_file = tempfile().unwrap();\n        temp_file\n            .write_all(\n                br#\"{\"content_type\":0,\"content_length\":708370,\"last_modified\":\"2021-04-13T04:37:41+00:00\"}abc\"#,\n            )\n            .unwrap();\n        temp_file.seek(SeekFrom::Start(0)).unwrap();\n\n        let (inner_stream, maybe_header, metadata) = read_file(temp_file).await.unwrap().unwrap();\n\n        let foo: Vec\u003c_\u003e = inner_stream.collect().await;\n        assert_eq!(foo, vec![Ok(Bytes::from(\"abc\"))]);\n        assert!(maybe_header.is_none());\n        assert_eq!(\n            metadata,\n            ImageMetadata {\n                content_length: Some(708_370),\n                content_type: Some(ImageContentType::Png),\n                last_modified: Some(\n                    DateTime::parse_from_rfc3339(\"2021-04-13T04:37:41+00:00\").unwrap()\n                )\n            }\n        );\n    }\n}\n\n#[cfg(test)]\nmod read_file_compat {\n    use crate::cache::{ImageContentType, ImageMetadata};\n\n    use super::read_file;\n    use bytes::Bytes;\n    use chrono::DateTime;\n    use futures::StreamExt;\n    use std::io::{Seek, SeekFrom, Write};\n    use tempfile::tempfile;\n\n    #[tokio::test]\n    async fn can_read_legacy() {\n        let mut temp_file = tempfile().unwrap();\n        temp_file\n            .write_all(\n                b\"\\x00\\x5b{\\\"content_type\\\":\\\"image/jpeg\\\",\\\"last_modified\\\":\\\"Sat, 10 Apr 2021 10:55:22 GMT\\\",\\\"size\\\":117888}abc\",\n            )\n            .unwrap();\n        temp_file.seek(SeekFrom::Start(0)).unwrap();\n\n        let (inner_stream, maybe_header, metadata) = read_file(temp_file).await.unwrap().unwrap();\n\n        let foo: Vec\u003c_\u003e = inner_stream.collect().await;\n        assert_eq!(foo, vec![Ok(Bytes::from(\"abc\"))]);\n        assert!(maybe_header.is_none());\n        assert_eq!(\n            metadata,\n            ImageMetadata {\n                content_length: Some(117_888),\n                content_type: Some(ImageContentType::Jpeg),\n                last_modified: Some(\n                    DateTime::parse_from_rfc2822(\"Sat, 10 Apr 2021 10:55:22 GMT\").unwrap()\n                )\n            }\n        );\n    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std::sync::atomic::{AtomicU64, Ordering};\nuse std::sync::Arc;\n\nuse super::{\n    Cache, CacheError, CacheKey, CacheStream, CallbackCache, ImageMetadata, InnerStream, MemStream,\n};\nuse async_trait::async_trait;\nuse bytes::Bytes;\nuse futures::FutureExt;\nuse lfu_cache::LfuCache;\nuse lru::LruCache;\nuse tokio::sync::mpsc::{channel, Sender};\nuse tokio::sync::Mutex;\n\ntype CacheValue = (Bytes, ImageMetadata, u64);\n\n/// Use LRU as the eviction strategy\npub type Lru = LruCache\u003cCacheKey, CacheValue\u003e;\n/// Use LFU as the eviction strategy\npub type Lfu = LfuCache\u003cCacheKey, CacheValue\u003e;\n\n/// Adapter trait for memory cache backends\npub trait InternalMemoryCache: Sync + Send {\n    fn unbounded() -\u003e Self;\n    fn get(\u0026mut self, key: \u0026CacheKey) -\u003e Option\u003c\u0026CacheValue\u003e;\n    fn push(\u0026mut self, key: CacheKey, data: CacheValue);\n    fn pop(\u0026mut self) -\u003e Option\u003c(CacheKey, CacheValue)\u003e;\n}\n\nimpl InternalMemoryCache for Lfu {\n    #[inline]\n    fn unbounded() -\u003e Self {\n        Self::unbounded()\n    }\n\n    #[inline]\n    fn get(\u0026mut self, key: \u0026CacheKey) -\u003e Option\u003c\u0026CacheValue\u003e {\n        self.get(key)\n    }\n\n    #[inline]\n    fn push(\u0026mut self, key: CacheKey, data: CacheValue) {\n        self.insert(key, data);\n    }\n\n    #[inline]\n    fn pop(\u0026mut self) -\u003e Option\u003c(CacheKey, CacheValue)\u003e {\n        self.pop_lfu_key_value()\n    }\n}\n\nimpl InternalMemoryCache for Lru {\n    #[inline]\n    fn unbounded() -\u003e Self {\n        Self::unbounded()\n    }\n\n    #[inline]\n    fn get(\u0026mut self, key: \u0026CacheKey) -\u003e Option\u003c\u0026CacheValue\u003e {\n        self.get(key)\n    }\n\n    #[inline]\n    fn push(\u0026mut self, key: CacheKey, data: CacheValue) {\n        self.put(key, data);\n    }\n\n    #[inline]\n    fn pop(\u0026mut self) -\u003e Option\u003c(CacheKey, CacheValue)\u003e {\n        self.pop_lru()\n    }\n}\n\n/// Memory accelerated disk cache. Uses the internal cache implementation in\n/// memory to speed up reads.\npub struct MemoryCache\u003cMemoryCacheImpl, ColdCache\u003e {\n    inner: ColdCache,\n    cur_mem_size: AtomicU64,\n    mem_cache: Mutex\u003cMemoryCacheImpl\u003e,\n    master_sender: Sender\u003c(CacheKey, Bytes, ImageMetadata, u64)\u003e,\n}\n\nimpl\u003cMemoryCacheImpl, ColdCache\u003e MemoryCache\u003cMemoryCacheImpl, ColdCache\u003e\nwhere\n    MemoryCacheImpl: 'static + InternalMemoryCache,\n    ColdCache: 'static + Cache,\n{\n    pub async fn new(inner: ColdCache, max_mem_size: crate::units::Bytes) -\u003e Arc\u003cSelf\u003e {\n        let (tx, mut rx) = channel(100);\n        let new_self = Arc::new(Self {\n            inner,\n            cur_mem_size: AtomicU64::new(0),\n            mem_cache: Mutex::new(MemoryCacheImpl::unbounded()),\n            master_sender: tx,\n        });\n\n        let new_self_0 = Arc::clone(\u0026new_self);\n        tokio::spawn(async move {\n            let new_self = new_self_0;\n            let max_mem_size = max_mem_size.get() / 20 * 19;\n            while let Some((key, bytes, metadata, size)) = rx.recv().await {\n                // Add to memory cache\n                // We can add first because we constrain our memory usage to 95%\n                new_self\n                    .cur_mem_size\n                    .fetch_add(size as u64, Ordering::Release);\n                new_self\n                    .mem_cache\n                    .lock()\n                    .await\n                    .push(key, (bytes, metadata, size));\n\n                // Pop if too large\n                while new_self.cur_mem_size.load(Ordering::Acquire) \u003e= max_mem_size as u64 {\n                    let popped = new_self\n                        .mem_cache\n                        .lock()\n                        .await\n                        .pop()\n                        .map(|(key, (bytes, metadata, size))| (key, bytes, metadata, size));\n                    if let Some((_, _, _, size)) = popped {\n                        new_self\n                            .cur_mem_size\n                            .fetch_sub(size as u64, Ordering::Release);\n                    } else {\n                        break;\n                    }\n                }\n            }\n        });\n\n        new_self\n    }\n}\n\n#[async_trait]\nimpl\u003cMemoryCacheImpl, ColdCache\u003e Cache for MemoryCache\u003cMemoryCacheImpl, ColdCache\u003e\nwhere\n    MemoryCacheImpl: InternalMemoryCache,\n    ColdCache: CallbackCache,\n{\n    #[inline]\n    async fn get(\n        \u0026self,\n        key: \u0026CacheKey,\n    ) -\u003e Option\u003cResult\u003c(CacheStream, ImageMetadata), super::CacheError\u003e\u003e {\n        match self.mem_cache.lock().now_or_never() {\n            Some(mut mem_cache) =\u003e match mem_cache.get(key).map(|(bytes, metadata, _)| {\n                Ok((InnerStream::Memory(MemStream(bytes.clone())), *metadata))\n            }) {\n                Some(v) =\u003e Some(v.and_then(|(inner, metadata)| {\n                    CacheStream::new(inner, None)\n                        .map(|v| (v, metadata))\n                        .map_err(|_| CacheError::DecryptionFailure)\n                })),\n                None =\u003e self.inner.get(key).await,\n            },\n            None =\u003e self.inner.get(key).await,\n        }\n    }\n\n    #[inline]\n    async fn put(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n    ) -\u003e Result\u003c(), super::CacheError\u003e {\n        self.inner\n            .put_with_on_completed_callback(key, image, metadata, self.master_sender.clone())\n            .await\n    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Serialize_repr};\nuse sodiumoxide::crypto::secretstream::{Header, Key, Pull, Stream as SecretStream};\nuse thiserror::Error;\nuse tokio::io::AsyncRead;\nuse tokio::sync::mpsc::Sender;\nuse tokio_util::codec::{BytesCodec, FramedRead};\n\npub use disk::DiskCache;\npub use fs::UpstreamError;\npub use mem::MemoryCache;\n\nuse self::compat::LegacyImageMetadata;\n\npub static ENCRYPTION_KEY: OnceCell\u003cKey\u003e = OnceCell::new();\n\nmod compat;\nmod disk;\nmod fs;\npub mod mem;\n\n#[derive(PartialEq, Eq, Hash, Clone)]\npub struct CacheKey(pub String, pub String, pub bool);\n\nimpl Display for CacheKey {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        if self.2 {\n            write!(f, \"saver/{}/{}\", self.0, self.1)\n        } else {\n            write!(f, \"data/{}/{}\", self.0, self.1)\n        }\n    }\n}\n\nimpl From\u003cCacheKey\u003e for PathBuf {\n    #[inline]\n    fn from(key: CacheKey) -\u003e Self {\n        key.to_string().into()\n    }\n}\n\nimpl From\u003c\u0026CacheKey\u003e for PathBuf {\n    #[inline]\n    fn from(key: \u0026CacheKey) -\u003e Self {\n        key.to_string().into()\n    }\n}\n\n#[derive(Clone)]\npub struct CachedImage(pub Bytes);\n\n#[derive(Copy, Clone, Serialize, Deserialize, Debug, PartialEq)]\npub struct ImageMetadata {\n    pub content_type: Option\u003cImageContentType\u003e,\n    pub content_length: Option\u003cu32\u003e,\n    pub last_modified: Option\u003cDateTime\u003cFixedOffset\u003e\u003e,\n}\n\n// Confirmed by Ply to be these types: https://link.eddie.sh/ZXfk0\n#[derive(Copy, Clone, Serialize_repr, Deserialize_repr, Debug, PartialEq, Eq)]\n#[repr(u8)]\npub enum ImageContentType {\n    Png = 0,\n    Jpeg,\n    Gif,\n}\n\npub struct InvalidContentType;\n\nimpl FromStr for ImageContentType {\n    type Err = InvalidContentType;\n\n    #[inline]\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        match s {\n            \"image/png\" =\u003e Ok(Self::Png),\n            \"image/jpeg\" =\u003e Ok(Self::Jpeg),\n            \"image/gif\" =\u003e Ok(Self::Gif),\n            _ =\u003e Err(InvalidContentType),\n        }\n    }\n}\n\nimpl AsRef\u003cstr\u003e for ImageContentType {\n    #[inline]\n    fn as_ref(\u0026self) -\u003e \u0026str {\n        match self {\n            Self::Png =\u003e \"image/png\",\n            Self::Jpeg =\u003e \"image/jpeg\",\n            Self::Gif =\u003e \"image/gif\",\n        }\n    }\n}\n\nimpl From\u003cLegacyImageMetadata\u003e for ImageMetadata {\n    fn from(legacy: LegacyImageMetadata) -\u003e Self {\n        Self {\n            content_type: legacy.content_type.map(|v| v.0),\n            content_length: legacy.size,\n            last_modified: legacy.last_modified.map(|v| v.0),\n        }\n    }\n}\n\n#[derive(Debug)]\npub enum ImageRequestError {\n    ContentType,\n    ContentLength,\n    LastModified,\n}\n\nimpl ImageMetadata {\n    pub fn new(\n        content_type: Option\u003cHeaderValue\u003e,\n        content_length: Option\u003cHeaderValue\u003e,\n        last_modified: Option\u003cHeaderValue\u003e,\n    ) -\u003e Result\u003cSelf, ImageRequestError\u003e {\n        Ok(Self {\n            content_type: content_type\n                .map(|v| match v.to_str() {\n                    Ok(v) =\u003e ImageContentType::from_str(v),\n                    Err(_) =\u003e Err(InvalidContentType),\n                })\n                .transpose()\n                .map_err(|_| ImageRequestError::ContentType)?,\n            content_length: content_length\n                .map(|header_val| {\n                    header_val\n                        .to_str()\n                        .map_err(|_| ImageRequestError::ContentLength)?\n                        .parse()\n                        .map_err(|_| ImageRequestError::ContentLength)\n                })\n                .transpose()?,\n            last_modified: last_modified\n                .map(|header_val| {\n                    DateTime::parse_from_rfc2822(\n                        header_val\n                            .to_str()\n                            .map_err(|_| ImageRequestError::LastModified)?,\n                    )\n                    .map_err(|_| ImageRequestError::LastModified)\n                })\n                .transpose()?,\n        })\n    }\n}\n\n#[derive(Error, Debug)]\npub enum CacheError {\n    #[error(transparent)]\n    Io(#[from] std::io::Error),\n    #[error(transparent)]\n    Reqwest(#[from] reqwest::Error),\n    #[error(transparent)]\n    Upstream(#[from] UpstreamError),\n    #[error(\"An error occurred while reading the decryption header\")]\n    DecryptionFailure,\n}\n\n#[async_trait]\npub trait Cache: Send + Sync {\n    async fn get(\u0026self, key: \u0026CacheKey)\n        -\u003e Option\u003cResult\u003c(CacheStream, ImageMetadata), CacheError\u003e\u003e;\n\n    async fn put(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n    ) -\u003e Result\u003c(), CacheError\u003e;\n}\n\n#[async_trait]\nimpl\u003cT: Cache\u003e Cache for Arc\u003cT\u003e {\n    #[inline]\n    async fn get(\n        \u0026self,\n        key: \u0026CacheKey,\n    ) -\u003e Option\u003cResult\u003c(CacheStream, ImageMetadata), CacheError\u003e\u003e {\n        self.as_ref().get(key).await\n    }\n\n    #[inline]\n    async fn put(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n    ) -\u003e Result\u003c(), CacheError\u003e {\n        self.as_ref().put(key, image, metadata).await\n    }\n}\n\n#[async_trait]\npub trait CallbackCache: Cache {\n    async fn put_with_on_completed_callback(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n        on_complete: Sender\u003c(CacheKey, Bytes, ImageMetadata, u64)\u003e,\n    ) -\u003e Result\u003c(), CacheError\u003e;\n}\n\n#[async_trait]\nimpl\u003cT: CallbackCache\u003e CallbackCache for Arc\u003cT\u003e {\n    #[inline]\n    async fn put_with_on_completed_callback(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n        on_complete: Sender\u003c(CacheKey, Bytes, ImageMetadata, u64)\u003e,\n    ) -\u003e Result\u003c(), CacheError\u003e {\n        self.as_ref()\n            .put_with_on_completed_callback(key, image, metadata, on_complete)\n            .await\n    }\n}\n\npub struct CacheStream {\n    inner: InnerStream,\n    decrypt: Option\u003cSecretStream\u003cPull\u003e\u003e,\n}\n\nimpl CacheStream {\n    pub(self) fn new(inner: InnerStream, header: Option\u003cHeader\u003e) -\u003e Result\u003cSelf, ()\u003e {\n        Ok(Self {\n            inner,\n            decrypt: header\n                .and_then(|header| {\n                    ENCRYPTION_KEY\n                        .get()\n                        .map(|key| SecretStream::init_pull(\u0026header, key))\n                })\n                .transpose()?,\n        })\n    }\n}\n\nimpl Stream for CacheStream {\n    type Item = CacheStreamItem;\n\n    fn poll_next(mut self: Pin\u003c\u0026mut Self\u003e, cx: \u0026mut Context\u003c'_\u003e) -\u003e Poll\u003cOption\u003cSelf::Item\u003e\u003e {\n        self.inner.poll_next_unpin(cx).map(|data| {\n            // False positive (`data`): https://link.eddie.sh/r1fXX\n            #[allow(clippy::option_if_let_else)]\n            if let Some(keystream) = self.decrypt.as_mut() {\n                data.map(|bytes_res| {\n                    bytes_res.and_then(|bytes| {\n                        keystream\n                            .pull(\u0026bytes, None)\n                            .map(|(data, _tag)| Bytes::from(data))\n                            .map_err(|_| UpstreamError)\n                    })\n                })\n            } else {\n                data\n            }\n        })\n    }\n}\n\npub(self) enum InnerStream {\n    Memory(MemStream),\n    Completed(FramedRead\u003cPin\u003cBox\u003cdyn AsyncRead + Send\u003e\u003e, BytesCodec\u003e),\n}\n\nimpl From\u003cCachedImage\u003e for InnerStream {\n    fn from(image: CachedImage) -\u003e Self {\n        Self::Memory(MemStream(image.0))\n    }\n}\n\ntype CacheStreamItem = Result\u003cBytes, UpstreamError\u003e;\n\nimpl Stream for InnerStream {\n    type Item = CacheStreamItem;\n\n    fn poll_next(self: Pin\u003c\u0026mut Self\u003e, cx: \u0026mut Context\u003c'_\u003e) -\u003e Poll\u003cOption\u003cSelf::Item\u003e\u003e {\n        match self.get_mut() {\n            Self::Memory(stream) =\u003e stream.poll_next_unpin(cx),\n            Self::Completed(stream) =\u003e stream\n                .poll_next_unpin(cx)\n                .map_ok(BytesMut::freeze)\n                .map_err(|_| UpstreamError),\n        }\n    }\n}\n\npub struct MemStream(pub Bytes);\n\nimpl Stream for MemStream {\n    type Item = CacheStreamItem;\n\n    fn poll_next(mut self: Pin\u003c\u0026mut Self\u003e, _: \u0026mut Context\u003c'_\u003e) -\u003e Poll\u003cOption\u003cSelf::Item\u003e\u003e {\n        let mut new_bytes = Bytes::new();\n        std::mem::swap(\u0026mut self.0, \u0026mut new_bytes);\n        if new_bytes.is_empty() {\n            Poll::Ready(None)\n        } else {\n            Poll::Ready(Some(Ok(new_bytes)))\n        }\n    }\n}\n\n#[cfg(test)]\nmod tests {\n    use super::*;\n\n    #[test]\n    fn metadata_size() {\n        assert_eq!(std::mem::size_of::\u003cImageMetadata\u003e(), 32);\n    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std::collections::HashMap;\nuse std::sync::Arc;\nuse std::time::Duration;\n\nuse actix_web::http::{HeaderMap, HeaderName, HeaderValue};\nuse actix_web::web::Data;\nuse bytes::Bytes;\nuse log::{debug, error, warn};\nuse once_cell::sync::Lazy;\nuse parking_lot::RwLock;\nuse reqwest::header::{\n    ACCESS_CONTROL_ALLOW_ORIGIN, ACCESS_CONTROL_EXPOSE_HEADERS, CACHE_CONTROL, CONTENT_LENGTH,\n    CONTENT_TYPE, LAST_MODIFIED, X_CONTENT_TYPE_OPTIONS,\n};\nuse reqwest::{Client, StatusCode};\nuse tokio::sync::watch::{channel, Receiver};\nuse tokio::sync::Notify;\n\nuse crate::cache::{Cache, CacheKey, ImageMetadata};\n\npub static HTTP_CLIENT: Lazy\u003cCachingClient\u003e = Lazy::new(|| CachingClient {\n    inner: Client::builder()\n        .pool_idle_timeout(Duration::from_secs(180))\n        .https_only(true)\n        .http2_prior_knowledge()\n        .build()\n        .expect(\"Client initialization to work\"),\n    locks: RwLock::new(HashMap::new()),\n});\n\npub static DEFAULT_HEADERS: Lazy\u003cHeaderMap\u003e = Lazy::new(|| {\n    let mut headers = HeaderMap::with_capacity(8);\n    headers.insert(X_CONTENT_TYPE_OPTIONS, HeaderValue::from_static(\"nosniff\"));\n    headers.insert(\n        ACCESS_CONTROL_ALLOW_ORIGIN,\n        HeaderValue::from_static(\"https://mangadex.org\"),\n    );\n    headers.insert(ACCESS_CONTROL_EXPOSE_HEADERS, HeaderValue::from_static(\"*\"));\n    headers.insert(\n        CACHE_CONTROL,\n        HeaderValue::from_static(\"public, max-age=1209600\"),\n    );\n    headers.insert(\n        HeaderName::from_static(\"timing-allow-origin\"),\n        HeaderValue::from_static(\"https://mangadex.org\"),\n    );\n    headers\n});\n\npub struct CachingClient {\n    inner: Client,\n    locks: RwLock\u003cHashMap\u003cString, Receiver\u003cFetchResult\u003e\u003e\u003e,\n}\n\n#[derive(Clone, Debug)]\npub enum FetchResult {\n    ServiceUnavailable,\n    InternalServerError,\n    Data(StatusCode, HeaderMap, Bytes),\n    Processing,\n}\n\nimpl CachingClient {\n    pub async fn fetch_and_cache(\n        \u0026'static self,\n        url: String,\n        key: CacheKey,\n        cache: Data\u003cdyn Cache\u003e,\n    ) -\u003e FetchResult {\n        if let Some(recv) = self.locks.read().get(\u0026url) {\n            let mut recv = recv.clone();\n            loop {\n                if !matches!(*recv.borrow(), FetchResult::Processing) {\n                    break;\n                }\n                if recv.changed().await.is_err() {\n                    break;\n                }\n            }\n\n            return recv.borrow().clone();\n        }\n        let url_0 = url.clone();\n\n        let notify = Arc::new(Notify::new());\n        let notify2 = Arc::clone(\u0026notify);\n\n        tokio::spawn(async move {\n            let (tx, rx) = channel(FetchResult::Processing);\n\n            self.locks.write().insert(url.clone(), rx);\n            notify.notify_one();\n            let resp = self.inner.get(\u0026url).send().await;\n\n            let resp = match resp {\n                Ok(mut resp) =\u003e {\n                    let content_type = resp.headers().get(CONTENT_TYPE);\n\n                    let is_image = content_type\n                        .map(|v| String::from_utf8_lossy(v.as_ref()).contains(\"image/\"))\n                        .unwrap_or_default();\n\n                    if resp.status() != StatusCode::OK || !is_image {\n                        warn!(\"Got non-OK or non-image response code from upstream, proxying and not caching result.\");\n\n                        let mut headers = DEFAULT_HEADERS.clone();\n\n                        if let Some(content_type) = content_type {\n                            headers.insert(CONTENT_TYPE, content_type.clone());\n                        }\n\n                        FetchResult::Data(\n                            resp.status(),\n                            headers,\n                            resp.bytes().await.unwrap_or_default(),\n                        )\n                    } else {\n                        let (content_type, length, last_mod) = {\n                            let headers = resp.headers_mut();\n                            (\n                                headers.remove(CONTENT_TYPE),\n                                headers.remove(CONTENT_LENGTH),\n                                headers.remove(LAST_MODIFIED),\n                            )\n                        };\n\n                        let body = resp.bytes().await.unwrap();\n\n                        debug!(\"Inserting into cache\");\n\n                        let metadata = ImageMetadata::new(\n                            content_type.clone(),\n                            length.clone(),\n                            last_mod.clone(),\n                        )\n                        .unwrap();\n\n                        match cache.put(key, body.clone(), metadata).await {\n                            Ok(()) =\u003e {\n                                debug!(\"Done putting into cache\");\n\n                                let mut headers = DEFAULT_HEADERS.clone();\n                                if let Some(content_type) = content_type {\n                                    headers.insert(CONTENT_TYPE, content_type);\n                                }\n\n                                if let Some(content_length) = length {\n                                    headers.insert(CONTENT_LENGTH, content_length);\n                                }\n\n                                if let Some(last_modified) = last_mod {\n                                    headers.insert(LAST_MODIFIED, last_modified);\n                                }\n\n                                FetchResult::Data(StatusCode::OK, headers, body)\n                            }\n                            Err(e) =\u003e {\n                                warn!(\"Failed to insert into cache: {}\", e);\n                                FetchResult::InternalServerError\n                            }\n                        }\n                    }\n                }\n                Err(e) =\u003e {\n                    error!(\"Failed to fetch image from server: {}\", e);\n                    FetchResult::ServiceUnavailable\n                }\n            };\n            // This shouldn't happen\n            tx.send(resp).unwrap();\n            self.locks.write().remove(\u0026url);\n        });\n\n        notify2.notified().await;\n\n        let mut recv = self.locks.read().get(\u0026url_0).unwrap().clone();\n        loop {\n            if !matches!(*recv.borrow(), FetchResult::Processing) {\n                break;\n            }\n            if recv.changed().await.is_err() {\n                break;\n            }\n        }\n        let resp = recv.borrow().clone();\n        resp\n    }\n\n    #[inline]\n    pub const fn inner(\u0026self) -\u003e \u0026Client {\n        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std::fmt::{Display, Formatter};\nuse std::fs::{File, OpenOptions};\nuse std::hint::unreachable_unchecked;\nuse std::io::{ErrorKind, Write};\nuse std::net::{IpAddr, Ipv4Addr, SocketAddr};\nuse std::num::NonZeroU16;\nuse std::path::{Path, PathBuf};\nuse std::str::FromStr;\nuse std::sync::atomic::{AtomicBool, Ordering};\n\nuse clap::{crate_authors, crate_description, crate_version, Clap};\nuse log::LevelFilter;\nuse serde::{Deserialize, Serialize};\nuse thiserror::Error;\nuse url::Url;\n\nuse crate::units::{KilobitsPerSecond, Mebibytes, Port};\n\n// Validate tokens is an atomic because it's faster than locking on rwlock.\npub static VALIDATE_TOKENS: AtomicBool = AtomicBool::new(false);\npub static OFFLINE_MODE: AtomicBool = AtomicBool::new(false);\n\n#[derive(Error, Debug)]\npub enum ConfigError {\n    #[error(\"No config found. One has been created for you to modify.\")]\n    NotInitialized,\n    #[error(transparent)]\n    Io(#[from] std::io::Error),\n    #[error(transparent)]\n    Parse(#[from] serde_yaml::Error),\n}\n\npub fn load_config() -\u003e Result\u003cConfig, ConfigError\u003e {\n    // Load cli args first\n    let cli_args: CliArgs = CliArgs::parse();\n\n    // Load yaml file next\n    let config_file: Result\u003cYamlArgs, _\u003e = {\n        let config_path = cli_args\n            .config_path\n            .as_deref()\n            .unwrap_or_else(|| Path::new(\"./settings.yaml\"));\n        match File::open(config_path) {\n            Ok(file) =\u003e serde_yaml::from_reader(file),\n            Err(e) if e.kind() == ErrorKind::NotFound =\u003e {\n                let mut file = OpenOptions::new()\n                    .write(true)\n                    .create_new(true)\n                    .open(config_path)\n                    .unwrap();\n\n                let default_config = include_str!(\"../settings.sample.yaml\");\n                file.write_all(default_config.as_bytes()).unwrap();\n\n                return Err(ConfigError::NotInitialized);\n            }\n            Err(e) =\u003e return Err(e.into()),\n        }\n    };\n\n    // generate config\n    let config = Config::from_cli_and_file(cli_args, config_file?);\n\n    // initialize globals\n    OFFLINE_MODE.store(\n        config\n            .unstable_options\n            .contains(\u0026UnstableOptions::OfflineMode),\n        Ordering::Release,\n    );\n\n    Ok(config)\n}\n\n#[derive(Debug)]\n/// Represents a fully parsed config, from a variety of sources.\npub struct Config {\n    pub cache_type: CacheType,\n    pub cache_path: PathBuf,\n    pub shutdown_timeout: NonZeroU16,\n    pub log_level: LevelFilter,\n    pub client_secret: ClientSecret,\n    pub port: Port,\n    pub bind_address: SocketAddr,\n    pub external_address: Option\u003cSocketAddr\u003e,\n    pub ephemeral_disk_encryption: bool,\n    pub network_speed: KilobitsPerSecond,\n    pub disk_quota: Mebibytes,\n    pub memory_quota: Mebibytes,\n    pub unstable_options: Vec\u003cUnstableOptions\u003e,\n    pub override_upstream: Option\u003cUrl\u003e,\n    pub enable_metrics: bool,\n}\n\nimpl Config {\n    fn from_cli_and_file(cli_args: CliArgs, file_args: YamlArgs) -\u003e Self {\n        let file_extended_options = file_args.extended_options.unwrap_or_default();\n\n        let log_level = match (cli_args.quiet, cli_args.verbose) {\n            (n, _) if n \u003e 2 =\u003e LevelFilter::Off,\n            (2, _) =\u003e LevelFilter::Error,\n            (1, _) =\u003e LevelFilter::Warn,\n            // Use log level from file if no flags were provided to CLI\n            (0, 0) =\u003e file_extended_options\n                .logging_level\n                .unwrap_or(LevelFilter::Info),\n            (_, 1) =\u003e LevelFilter::Debug,\n            (_, n) if n \u003e 1 =\u003e LevelFilter::Trace,\n            // compiler can't figure it out\n            _ =\u003e unsafe { unreachable_unchecked() },\n        };\n\n        let bind_port = cli_args\n            .port\n            .unwrap_or(file_args.server_settings.port)\n            .get();\n\n        // This needs to be outside because rust isn't smart enough yet to\n        // realize a disjointed borrow of a moved value is ok. This will be\n        // fixed in Rust 2021.\n        let external_port = file_args\n            .server_settings\n            .external_port\n            .map_or(bind_port, Port::get);\n\n        Self {\n            cache_type: cli_args\n                .cache_type\n                .or(file_extended_options.cache_type)\n                .unwrap_or_default(),\n            cache_path: cli_args\n                .cache_path\n                .or(file_extended_options.cache_path)\n                .unwrap_or_else(|| PathBuf::from_str(\"./cache\").unwrap()),\n            shutdown_timeout: file_args\n                .server_settings\n                .graceful_shutdown_wait_seconds\n                .unwrap_or(unsafe { NonZeroU16::new_unchecked(60) }),\n            log_level,\n            // secret should never be in CLI\n            client_secret: if let Ok(v) = std::env::var(\"CLIENT_SECRET\") {\n                ClientSecret(v)\n            } else {\n                file_args.server_settings.secret\n            },\n            port: cli_args.port.unwrap_or(file_args.server_settings.port),\n            bind_address: SocketAddr::new(\n                file_args\n                    .server_settings\n                    .hostname\n                    .unwrap_or_else(|| IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0))),\n                bind_port,\n            ),\n            external_address: file_args\n                .server_settings\n                .external_ip\n                .map(|ip_addr| SocketAddr::new(ip_addr, external_port)),\n            ephemeral_disk_encryption: cli_args.ephemeral_disk_encryption\n                || file_extended_options\n                    .ephemeral_disk_encryption\n                    .unwrap_or_default(),\n            network_speed: cli_args\n                .network_speed\n                .unwrap_or(file_args.server_settings.external_max_kilobits_per_second),\n            disk_quota: cli_args\n                .disk_quota\n                .unwrap_or(file_args.max_cache_size_in_mebibytes),\n            memory_quota: cli_args\n                .memory_quota\n                .or(file_extended_options.memory_quota)\n                .unwrap_or_default(),\n            enable_metrics: file_extended_options.enable_metrics.unwrap_or_default(),\n\n            // Unstable options (and related) should never be in yaml config\n            unstable_options: cli_args.unstable_options,\n            override_upstream: cli_args.override_upstream,\n        }\n    }\n}\n\n// this intentionally does not implement display\n#[derive(Deserialize, Serialize, Clone)]\npub struct ClientSecret(String);\n\nimpl std::fmt::Debug for ClientSecret {\n    fn fmt(\u0026self, f: \u0026mut Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        write!(f, \"[client secret]\")\n    }\n}\n\n#[derive(Deserialize, Copy, Clone, Debug)]\n#[serde(rename_all = \"snake_case\")]\npub enum CacheType {\n    OnDisk,\n    Lru,\n    Lfu,\n}\n\nimpl FromStr for CacheType {\n    type Err = String;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        match s {\n            \"on_disk\" =\u003e Ok(Self::OnDisk),\n            \"lru\" =\u003e Ok(Self::Lru),\n            \"lfu\" =\u003e Ok(Self::Lfu),\n            _ =\u003e Err(format!(\"Unknown option: {}\", s)),\n        }\n    }\n}\n\nimpl Default for CacheType {\n    fn default() -\u003e Self {\n        Self::OnDisk\n    }\n}\n\n#[derive(Deserialize)]\nstruct YamlArgs {\n    // Naming is legacy\n    max_cache_size_in_mebibytes: Mebibytes,\n    server_settings: YamlServerSettings,\n    // This implementation custom options\n    extended_options: Option\u003cYamlExtendedOptions\u003e,\n}\n\n// Naming is legacy\n#[derive(Deserialize)]\nstruct YamlServerSettings {\n    secret: ClientSecret,\n    #[serde(default)]\n    port: Port,\n    external_max_kilobits_per_second: KilobitsPerSecond,\n    external_port: Option\u003cPort\u003e,\n    graceful_shutdown_wait_seconds: Option\u003cNonZeroU16\u003e,\n    hostname: Option\u003cIpAddr\u003e,\n    external_ip: Option\u003cIpAddr\u003e,\n}\n\n#[derive(Deserialize, Default)]\nstruct YamlExtendedOptions {\n    memory_quota: Option\u003cMebibytes\u003e,\n    cache_type: Option\u003cCacheType\u003e,\n    ephemeral_disk_encryption: Option\u003cbool\u003e,\n    enable_metrics: Option\u003cbool\u003e,\n    logging_level: Option\u003cLevelFilter\u003e,\n    cache_path: Option\u003cPathBuf\u003e,\n}\n\n#[derive(Clap, Clone)]\n#[clap(version = crate_version!(), author = crate_authors!(), about = crate_description!())]\nstruct CliArgs {\n    /// The port to listen on.\n    #[clap(short, long)]\n    pub port: Option\u003cPort\u003e,\n    /// How large, in mebibytes, the in-memory cache should be. Note that this\n    /// does not include runtime memory usage.\n    #[clap(long)]\n    pub memory_quota: Option\u003cMebibytes\u003e,\n    /// How large, in mebibytes, the on-disk cache should be. Note that actual\n    /// values may be larger for metadata information.\n    #[clap(long)]\n    pub disk_quota: Option\u003cMebibytes\u003e,\n    /// Sets the location of the disk cache.\n    #[clap(long)]\n    pub cache_path: Option\u003cPathBuf\u003e,\n    /// The network speed to advertise to Mangadex@Home control server.\n    #[clap(long)]\n    pub network_speed: Option\u003cKilobitsPerSecond\u003e,\n    /// Changes verbosity. Default verbosity is INFO, while increasing counts of\n    /// verbose flags increases the verbosity to DEBUG and TRACE, respectively.\n    #[clap(short, long, parse(from_occurrences), conflicts_with = \"quiet\")]\n    pub verbose: usize,\n    /// Changes verbosity. Default verbosity is INFO, while increasing counts of\n    /// quiet flags decreases the verbosity to WARN, ERROR, and no logs,\n    /// respectively.\n    #[clap(short, long, parse(from_occurrences), conflicts_with = \"verbose\")]\n    pub quiet: usize,\n    #[clap(short = 'Z', long)]\n    pub unstable_options: Vec\u003cUnstableOptions\u003e,\n    #[clap(long)]\n    pub override_upstream: Option\u003cUrl\u003e,\n    /// Enables ephemeral disk encryption. Items written to disk are first\n    /// encrypted with a key generated at runtime. There are implications to\n    /// performance, privacy, and usability with this flag enabled.\n    #[clap(short, long)]\n    pub ephemeral_disk_encryption: bool,\n    #[clap(short, long)]\n    pub config_path: Option\u003cPathBuf\u003e,\n    #[clap(short = 't', long)]\n    pub cache_type: Option\u003cCacheType\u003e,\n}\n\n#[derive(Clone, Copy, Debug, PartialEq, Eq)]\npub enum UnstableOptions {\n    /// Overrides the upstream URL to fetch images from. Don't use this unless\n    /// you know what you're dealing with.\n    OverrideUpstream,\n\n    /// Disables token validation. Don't use this unless you know the\n    /// ramifications of this command.\n    DisableTokenValidation,\n\n    /// Tries to run without communication to MangaDex.\n    OfflineMode,\n\n    /// Serves HTTP in plaintext\n    DisableTls,\n}\n\nimpl FromStr for UnstableOptions {\n    type Err = String;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        match s {\n            \"override-upstream\" =\u003e Ok(Self::OverrideUpstream),\n            \"disable-token-validation\" =\u003e Ok(Self::DisableTokenValidation),\n            \"offline-mode\" =\u003e Ok(Self::OfflineMode),\n            \"disable-tls\" =\u003e Ok(Self::DisableTls),\n            _ =\u003e Err(format!(\"Unknown unstable option '{}'\", s)),\n        }\n    }\n}\n\nimpl Display for UnstableOptions {\n    fn fmt(\u0026self, f: \u0026mut Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        match self {\n            Self::OverrideUpstream =\u003e write!(f, \"override-upstream\"),\n            Self::DisableTokenValidation =\u003e write!(f, \"disable-token-validation\"),\n            Self::OfflineMode =\u003e write!(f, \"offline-mode\"),\n            Self::DisableTls =\u003e write!(f, \"disable-tls\"),\n        }\n    }\n}\n\n#[cfg(test)]\nmod sample_yaml {\n    use crate::config::YamlArgs;\n\n    #[test]\n    fn sample_yaml_parses() {\n        assert!(serde_yaml::from_str::\u003cYamlArgs\u003e(include_str!(\"../settings.sample.yaml\")).is_ok());\n    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clippy::nursery)]\n// We're end users, so these is ok\n#![allow(clippy::module_name_repetitions)]\n\nuse std::env::VarError;\nuse std::error::Error;\nuse std::fmt::Display;\nuse std::num::ParseIntError;\nuse std::sync::atomic::{AtomicBool, Ordering};\nuse std::sync::Arc;\nuse std::time::Duration;\n\nuse actix_web::rt::{spawn, time, System};\nuse actix_web::web::{self, Data};\nuse actix_web::{App, HttpResponse, HttpServer};\nuse cache::{Cache, DiskCache};\nuse config::Config;\nuse log::{debug, error, info, warn};\nuse parking_lot::RwLock;\nuse rustls::{NoClientAuth, ServerConfig};\nuse simple_logger::SimpleLogger;\nuse sodiumoxide::crypto::secretstream::gen_key;\nuse state::{RwLockServerState, ServerState};\nuse stop::send_stop;\nuse thiserror::Error;\n\nuse crate::cache::mem::{Lfu, Lru};\nuse crate::cache::{MemoryCache, ENCRYPTION_KEY};\nuse crate::config::{CacheType, UnstableOptions, OFFLINE_MODE};\nuse crate::state::DynamicServerCert;\n\nmod cache;\nmod client;\nmod config;\nmod metrics;\nmod ping;\nmod routes;\nmod state;\nmod stop;\nmod units;\n\nconst CLIENT_API_VERSION: usize = 31;\n\n#[derive(Error, Debug)]\nenum ServerError {\n    #[error(\"There was a failure parsing config\")]\n    Config(#[from] VarError),\n    #[error(\"Failed to parse an int\")]\n    ParseInt(#[from] ParseIntError),\n}\n\n#[actix_web::main]\nasync fn main() -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n    sodiumoxide::init().expect(\"Failed to initialize crypto\");\n    // It's ok to fail early here, it would imply we have a invalid config.\n    dotenv::dotenv().ok();\n\n    //\n    // Config loading\n    //\n\n    let config = match config::load_config() {\n        Ok(c) =\u003e c,\n        Err(e) =\u003e {\n            eprintln!(\"{}\", e);\n            return Err(Box::new(e) as Box\u003c_\u003e);\n        }\n    };\n\n    let memory_quota = config.memory_quota;\n    let disk_quota = config.disk_quota;\n    let cache_type = config.cache_type;\n    let cache_path = config.cache_path.clone();\n    let disable_tls = config\n        .unstable_options\n        .contains(\u0026UnstableOptions::DisableTls);\n    let bind_address = config.bind_address;\n\n    //\n    // Logging and warnings\n    //\n\n    SimpleLogger::new().with_level(config.log_level).init()?;\n\n    if let Err(e) = print_preamble_and_warnings(\u0026config) {\n        error!(\"{}\", e);\n        return Err(e);\n    }\n\n    debug!(\"{:?}\", \u0026config);\n\n    let client_secret = config.client_secret.clone();\n    let client_secret_1 = config.client_secret.clone();\n\n    if config.ephemeral_disk_encryption {\n        info!(\"Running with at-rest encryption!\");\n        ENCRYPTION_KEY.set(gen_key()).unwrap();\n    }\n\n    if config.enable_metrics {\n        metrics::init();\n    }\n\n    // HTTP Server init\n\n    let server = if OFFLINE_MODE.load(Ordering::Acquire) {\n        ServerState::init_offline()\n    } else {\n        ServerState::init(\u0026client_secret, \u0026config).await?\n    };\n    let data_0 = Arc::new(RwLockServerState(RwLock::new(server)));\n    let data_1 = Arc::clone(\u0026data_0);\n\n    //\n    // At this point, the server is ready to start, and starts the necessary\n    // threads.\n    //\n\n    // Set ctrl+c to send a stop message\n    let running = Arc::new(AtomicBool::new(true));\n    let running_1 = running.clone();\n    let system = System::current();\n    ctrlc::set_handler(move || {\n        let system = \u0026system;\n        let client_secret = client_secret.clone();\n        let running_2 = Arc::clone(\u0026running_1);\n        if !OFFLINE_MODE.load(Ordering::Acquire) {\n            System::new().block_on(async move {\n                if running_2.load(Ordering::SeqCst) {\n                    send_stop(\u0026client_secret).await;\n                } else {\n                    warn!(\"Got second Ctrl-C, forcefully exiting\");\n                    system.stop();\n                }\n            });\n        }\n        running_1.store(false, Ordering::SeqCst);\n    })\n    .expect(\"Error setting Ctrl-C handler\");\n\n    // Spawn ping task\n    if !OFFLINE_MODE.load(Ordering::Acquire) {\n        spawn(async move {\n            let mut interval = time::interval(Duration::from_secs(90));\n            let mut data = Arc::clone(\u0026data_0);\n            loop {\n                interval.tick().await;\n                debug!(\"Sending ping!\");\n                ping::update_server_state(\u0026client_secret_1, \u0026config, \u0026mut data).await;\n            }\n        });\n    }\n\n    let memory_max_size = memory_quota.into();\n    let cache = DiskCache::new(disk_quota.into(), cache_path.clone()).await;\n    let cache: Arc\u003cdyn Cache\u003e = match cache_type {\n        CacheType::OnDisk =\u003e cache,\n        CacheType::Lru =\u003e MemoryCache::\u003cLfu, _\u003e::new(cache, memory_max_size).await,\n        CacheType::Lfu =\u003e MemoryCache::\u003cLru, _\u003e::new(cache, memory_max_size).await,\n    };\n\n    let cache_0 = Arc::clone(\u0026cache);\n\n    // Start HTTPS server\n    let server = HttpServer::new(move || {\n        App::new()\n            .service(routes::index)\n            .service(routes::token_data)\n            .service(routes::token_data_saver)\n            .service(routes::metrics)\n            .route(\n                \"/data/{tail:.*}\",\n                web::get().to(HttpResponse::UnavailableForLegalReasons),\n            )\n            .route(\n                \"/data-saver/{tail:.*}\",\n                web::get().to(HttpResponse::UnavailableForLegalReasons),\n            )\n            .route(\"{tail:.*}\", web::get().to(routes::default))\n            .app_data(Data::from(Arc::clone(\u0026data_1)))\n            .app_data(Data::from(Arc::clone(\u0026cache_0)))\n    })\n    .shutdown_timeout(60);\n\n    if disable_tls {\n        server.bind(bind_address)?.run().await?;\n    } else {\n        // Rustls only supports TLS 1.2 and 1.3.\n        let tls_config = {\n            let mut tls_config = ServerConfig::new(NoClientAuth::new());\n            tls_config.cert_resolver = Arc::new(DynamicServerCert);\n            tls_config\n        };\n\n        server.bind_rustls(bind_address, tls_config)?.run().await?;\n    }\n\n    // Waiting for us to finish sending stop message\n    while running.load(Ordering::SeqCst) {\n        std::thread::sleep(Duration::from_millis(250));\n    }\n\n    Ok(())\n}\n\n#[derive(Debug)]\nenum InvalidCombination {\n    MissingUnstableOption(\u0026'static str, UnstableOptions),\n}\n\nimpl Display for InvalidCombination {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        match self {\n            InvalidCombination::MissingUnstableOption(opt, arg) =\u003e {\n                write!(\n                    f,\n                    \"The option '{}' requires the unstable option '-Z {}'\",\n                    opt, arg\n                )\n            }\n        }\n    }\n}\n\nimpl Error for InvalidCombination {}\n\nfn print_preamble_and_warnings(args: \u0026Config) -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n    println!(concat!(\n        env!(\"CARGO_PKG_NAME\"),\n        \" \",\n        env!(\"CARGO_PKG_VERSION\"),\n        \" (\",\n        env!(\"VERGEN_GIT_SHA_SHORT\"),\n        \")\",\n        \"  Copyright (C) 2021  \",\n        env!(\"CARGO_PKG_AUTHORS\"),\n        \"\\n\\n\",\n        env!(\"CARGO_PKG_NAME\"),\n        \" is free software: you can redistribute it and/or modify\\n\\\n        it under the terms of the GNU General Public License as published by\\n\\\n        the Free Software Foundation, either version 3 of the License, or\\n\\\n        (at your option) any later version.\\n\\n\",\n        env!(\"CARGO_PKG_NAME\"),\n        \" is distributed in the hope that it will be useful,\\n\\\n        but WITHOUT ANY WARRANTY; without even the implied warranty of\\n\\\n        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\\n\\\n        GNU General Public License for more details.\\n\\n\\\n        You should have received a copy of the GNU General Public License\\n\\\n        along with \",\n        env!(\"CARGO_PKG_NAME\"),\n        \". If not, see \u003chttps://www.gnu.org/licenses/\u003e.\\n\"\n    ));\n\n    if args.ephemeral_disk_encryption {\n        error!(\"Encrypted files are _very_ broken; caveat emptor!\");\n    }\n\n    if !args.unstable_options.is_empty() {\n        warn!(\"Unstable options are enabled. These options should not be used in production!\");\n    }\n\n    if args\n        .unstable_options\n        .contains(\u0026UnstableOptions::OfflineMode)\n    {\n        warn!(\"Running in offline mode. No communication to MangaDex will be made!\");\n    }\n\n    if args.unstable_options.contains(\u0026UnstableOptions::DisableTls) {\n        warn!(\"Serving insecure traffic! You better be running this for development only.\");\n    }\n\n    if args.override_upstream.is_some()\n        \u0026\u0026 !args\n            .unstable_options\n            .contains(\u0026UnstableOptions::OverrideUpstream)\n    {\n        Err(Box::new(InvalidCombination::MissingUnstableOption(\n            \"override-upstream\",\n            UnstableOptions::OverrideUpstream,\n        )))\n    } else {\n        Ok(())\n    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once_cell::sync::Lazy;\nuse prometheus::{register_int_counter, IntCounter};\n\nmacro_rules! init_counters {\n    ($(($counter:ident, $ty:ty, $name:literal, $desc:literal),)*) =\u003e {\n        $(\n            pub static $counter: Lazy\u003c$ty\u003e = Lazy::new(|| {\n                register_int_counter!($name, $desc).unwrap()\n            });\n        )*\n\n        #[allow(clippy::shadow_unrelated)]\n        pub fn init() {\n            $(let _a = $counter.get();)*\n        }\n    };\n}\n\ninit_counters!(\n    (\n        CACHE_HIT_COUNTER,\n        IntCounter,\n        \"cache_hit\",\n        \"The number of cache hits.\"\n    ),\n    (\n        CACHE_MISS_COUNTER,\n        IntCounter,\n        \"cache_miss\",\n        \"The number of cache misses.\"\n    ),\n    (\n        REQUESTS_TOTAL_COUNTER,\n        IntCounter,\n        \"requests_total\",\n        \"The total number of requests served.\"\n    ),\n    (\n        REQUESTS_DATA_COUNTER,\n        IntCounter,\n        \"requests_data\",\n        \"The number of requests served from the /data endpoint.\"\n    ),\n    (\n        REQUESTS_DATA_SAVER_COUNTER,\n        IntCounter,\n        \"requests_data_saver\",\n        \"The number of requests served from the /data-saver endpoint.\"\n    ),\n    (\n        REQUESTS_OTHER_COUNTER,\n        IntCounter,\n        \"requests_other\",\n        \"The total number of request not served by primary endpoints.\"\n    ),\n);\n","traces":[{"line":7,"address":[5160256,5160864,5162556,5162688,5163296,5161340,5161472,5163772,5161948,5163164,5162080,5160732],"length":1,"stats":{"Line":0},"fn_name":"{{closure}}"},{"line":8,"address":[5161355,5160614,5162703,5163311,5160271,5160747,5161963,5163179,5161487,5162571,5163046,5163787,5162095,5163654,5161830,5161222,5160879,5162438],"length":1,"stats":{"Line":0},"fn_name":null},{"line":13,"address":[5163888],"length":1,"stats":{"Line":0},"fn_name":"init"},{"line":14,"address":[5163892],"length":1,"stats":{"Line":0},"fn_name":null}],"covered":0,"coverable":4},{"path":["/","home","edward","Documents","repos","mangadex-home","src","ping.rs"],"content":"use std::sync::atomic::Ordering;\nuse std::{io::BufReader, sync::Arc};\n\nuse log::{debug, error, info, warn};\nuse rustls::internal::pemfile::{certs, rsa_private_keys};\nuse rustls::sign::{RSASigningKey, SigningKey};\nuse rustls::Certificate;\nuse serde::de::{MapAccess, Visitor};\nuse serde::{Deserialize, Serialize};\nuse serde_repr::Deserialize_repr;\nuse sodiumoxide::crypto::box_::PrecomputedKey;\nuse url::Url;\n\nuse crate::config::{ClientSecret, Config, UnstableOptions, VALIDATE_TOKENS};\nuse crate::state::{\n    RwLockServerState, PREVIOUSLY_COMPROMISED, PREVIOUSLY_PAUSED, TLS_CERTS,\n    TLS_PREVIOUSLY_CREATED, TLS_SIGNING_KEY,\n};\nuse crate::units::{BytesPerSecond, Mebibytes, Port};\nuse crate::CLIENT_API_VERSION;\n\npub const CONTROL_CENTER_PING_URL: \u0026str = \"https://api.mangadex.network/ping\";\n\n#[derive(Serialize)]\npub struct Request\u003c'a\u003e {\n    secret: \u0026'a ClientSecret,\n    port: Port,\n    disk_space: Mebibytes,\n    network_speed: BytesPerSecond,\n    build_version: usize,\n    tls_created_at: Option\u003cString\u003e,\n}\n\nimpl\u003c'a\u003e Request\u003c'a\u003e {\n    fn from_config_and_state(secret: \u0026'a ClientSecret, config: \u0026Config) -\u003e Self {\n        Self {\n            secret,\n            port: config.port,\n            disk_space: config.disk_quota,\n            network_speed: config.network_speed.into(),\n            build_version: CLIENT_API_VERSION,\n            tls_created_at: TLS_PREVIOUSLY_CREATED\n                .get()\n                .map(|v| v.load().as_ref().clone()),\n        }\n    }\n}\n\nimpl\u003c'a\u003e From\u003c(\u0026'a ClientSecret, \u0026Config)\u003e for Request\u003c'a\u003e {\n    fn from((secret, config): (\u0026'a ClientSecret, \u0026Config)) -\u003e Self {\n        Self {\n            secret,\n            port: config.port,\n            disk_space: config.disk_quota,\n            network_speed: config.network_speed.into(),\n            build_version: CLIENT_API_VERSION,\n            tls_created_at: None,\n        }\n    }\n}\n\n#[derive(Deserialize, Debug)]\n#[serde(untagged)]\npub enum Response {\n    Ok(OkResponse),\n    Error(ErrorResponse),\n}\n\n#[derive(Deserialize, Debug)]\npub struct OkResponse {\n    pub image_server: Url,\n    pub latest_build: usize,\n    pub url: Url,\n    pub token_key: Option\u003cString\u003e,\n    pub compromised: bool,\n    pub paused: bool,\n    #[serde(default)]\n    pub force_tokens: bool,\n    pub tls: Option\u003cTls\u003e,\n}\n\n#[derive(Deserialize, Debug)]\npub struct ErrorResponse {\n    pub error: String,\n    pub status: ErrorCode,\n}\n\n#[derive(Deserialize_repr, Debug, Copy, Clone)]\n#[repr(u16)]\npub enum ErrorCode {\n    MalformedJson = 400,\n    InvalidSecret = 401,\n    InvalidContentType = 415,\n}\n\npub struct Tls {\n    pub created_at: String,\n    pub priv_key: Arc\u003cBox\u003cdyn SigningKey\u003e\u003e,\n    pub certs: Vec\u003cCertificate\u003e,\n}\n\nimpl\u003c'de\u003e Deserialize\u003c'de\u003e for Tls {\n    fn deserialize\u003cD\u003e(deserializer: D) -\u003e Result\u003cSelf, D::Error\u003e\n    where\n        D: serde::Deserializer\u003c'de\u003e,\n    {\n        struct TlsVisitor;\n\n        impl\u003c'de\u003e Visitor\u003c'de\u003e for TlsVisitor {\n            type Value = Tls;\n\n            fn expecting(\u0026self, formatter: \u0026mut std::fmt::Formatter) -\u003e std::fmt::Result {\n                formatter.write_str(\"a tls struct\")\n            }\n\n            fn visit_map\u003cA\u003e(self, mut map: A) -\u003e Result\u003cSelf::Value, A::Error\u003e\n            where\n                A: MapAccess\u003c'de\u003e,\n            {\n                let mut created_at = None;\n                let mut priv_key = None;\n                let mut certificates = None;\n\n                while let Some((key, value)) = map.next_entry::\u003c\u0026str, String\u003e()? {\n                    match key {\n                        \"created_at\" =\u003e created_at = Some(value.to_string()),\n                        \"private_key\" =\u003e {\n                            priv_key = rsa_private_keys(\u0026mut BufReader::new(value.as_bytes()))\n                                .ok()\n                                .and_then(|mut v| {\n                                    v.pop().and_then(|key| RSASigningKey::new(\u0026key).ok())\n                                });\n                        }\n                        \"certificate\" =\u003e {\n                            certificates = certs(\u0026mut BufReader::new(value.as_bytes())).ok();\n                        }\n                        _ =\u003e (), // Ignore extra fields\n                    }\n                }\n\n                match (created_at, priv_key, certificates) {\n                    (Some(created_at), Some(priv_key), Some(certificates)) =\u003e Ok(Tls {\n                        created_at,\n                        priv_key: Arc::new(Box::new(priv_key)),\n                        certs: certificates,\n                    }),\n                    _ =\u003e Err(serde::de::Error::custom(\"Could not deserialize tls info\")),\n                }\n            }\n        }\n\n        deserializer.deserialize_map(TlsVisitor)\n    }\n}\n\nimpl std::fmt::Debug for Tls {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        f.debug_struct(\"Tls\")\n            .field(\"created_at\", \u0026self.created_at)\n            .finish()\n    }\n}\n\npub async fn update_server_state(\n    secret: \u0026ClientSecret,\n    cli: \u0026Config,\n    data: \u0026mut Arc\u003cRwLockServerState\u003e,\n) {\n    let req = Request::from_config_and_state(secret, cli);\n    let client = reqwest::Client::new();\n    let resp = client.post(CONTROL_CENTER_PING_URL).json(\u0026req).send().await;\n    match resp {\n        Ok(resp) =\u003e match resp.json::\u003cResponse\u003e().await {\n            Ok(Response::Ok(resp)) =\u003e {\n                debug!(\"got write guard for server state\");\n                let mut write_guard = data.0.write();\n\n                let image_server_changed = write_guard.image_server != resp.image_server;\n                if !write_guard.url_overridden \u0026\u0026 image_server_changed {\n                    write_guard.image_server = resp.image_server;\n                } else if image_server_changed {\n                    warn!(\"Ignoring new upstream url!\");\n                }\n\n                if let Some(key) = resp.token_key {\n                    if let Some(key) = base64::decode(\u0026key)\n                        .ok()\n                        .and_then(|k| PrecomputedKey::from_slice(\u0026k))\n                    {\n                        write_guard.precomputed_key = key;\n                    } else {\n                        error!(\"Failed to parse token key: got {}\", key);\n                    }\n                }\n\n                if !cli\n                    .unstable_options\n                    .contains(\u0026UnstableOptions::DisableTokenValidation)\n                    \u0026\u0026 VALIDATE_TOKENS.load(Ordering::Acquire) != resp.force_tokens\n                {\n                    if resp.force_tokens {\n                        info!(\"Client received command to enforce token validity.\");\n                    } else {\n                        info!(\"Client received command to no longer enforce token validity\");\n                    }\n                    VALIDATE_TOKENS.store(resp.force_tokens, Ordering::Release);\n                }\n\n                if let Some(tls) = resp.tls {\n                    TLS_PREVIOUSLY_CREATED\n                        .get()\n                        .unwrap()\n                        .swap(Arc::new(tls.created_at));\n                    TLS_SIGNING_KEY.get().unwrap().swap(tls.priv_key);\n                    TLS_CERTS.get().unwrap().swap(Arc::new(tls.certs));\n                }\n\n                let previously_compromised = PREVIOUSLY_COMPROMISED.load(Ordering::Acquire);\n                if resp.compromised != previously_compromised {\n                    PREVIOUSLY_COMPROMISED.store(resp.compromised, Ordering::Release);\n                    if resp.compromised {\n                        error!(\"Got compromised response from control center!\");\n                    } else if previously_compromised {\n                        info!(\"No longer compromised!\");\n                    }\n                }\n\n                let previously_paused = PREVIOUSLY_PAUSED.load(Ordering::Acquire);\n                if resp.paused != previously_paused {\n                    PREVIOUSLY_PAUSED.store(resp.paused, Ordering::Release);\n                    if resp.paused {\n                        warn!(\"Control center has paused this node.\");\n                    } else {\n                        info!(\"Control center is no longer pausing this node.\");\n                    }\n                }\n\n                if resp.url != write_guard.url {\n                    info!(\"This client's URL has been updated to {}\", resp.url);\n                }\n\n                debug!(\"dropping write guard for server state\");\n            }\n            Ok(Response::Error(resp)) =\u003e {\n                error!(\n                    \"Got an {} error from upstream: {}\",\n                    resp.status as u16, resp.error\n                );\n            }\n            Err(e) =\u003e warn!(\"Got malformed response: {}\", e),\n        },\n        Err(e) =\u003e match e {\n            e if e.is_timeout() =\u003e {\n                error!(\"Response timed out to control server. Is MangaDex down?\");\n            }\n            e =\u003e warn!(\"Failed to send request: {}\", e),\n        },\n    }\n}\n","traces":[{"line":35,"address":[5142816],"length":1,"stats":{"Line":0},"fn_name":"from_config_and_state"},{"line":38,"address":[5142845],"length":1,"stats":{"Line":0},"fn_name":null},{"line":39,"address":[5142857],"length":1,"stats":{"Line":0},"fn_name":null},{"line":40,"address":[5142866],"length":1,"stats":{"Line":0},"fn_name":null},{"line":42,"address":[5142880],"length":1,"stats":{"Line":0},"fn_name":null},{"line":50,"address":[5143212,5143184],"length":1,"stats":{"Line":0},"fn_name":"from"},{"line":53,"address":[5143225],"length":1,"stats":{"Line":0},"fn_name":null},{"line":54,"address":[5143237],"length":1,"stats":{"Line":0},"fn_name":null},{"line":55,"address":[5143246],"length":1,"stats":{"Line":0},"fn_name":null},{"line":103,"address":[5143360],"length":1,"stats":{"Line":0},"fn_name":"deserialize\u003cserde::__private::de::content::ContentRefDeserializer\u003cserde_json::error::Error\u003e\u003e"},{"line":109,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":110,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":112,"address":[5143392],"length":1,"stats":{"Line":0},"fn_name":"expecting"},{"line":113,"address":[5143419],"length":1,"stats":{"Line":0},"fn_name":null},{"line":116,"address":[5143456,5145125],"length":1,"stats":{"Line":0},"fn_name":"visit_map\u003c\u0026mut 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std::sync::atomic::Ordering;\n\nuse actix_web::error::ErrorNotFound;\nuse actix_web::http::header::{CONTENT_LENGTH, CONTENT_TYPE, LAST_MODIFIED};\nuse actix_web::http::HeaderValue;\nuse actix_web::web::Path;\nuse actix_web::HttpResponseBuilder;\nuse actix_web::{get, web::Data, HttpRequest, HttpResponse, Responder};\nuse base64::DecodeError;\nuse bytes::Bytes;\nuse chrono::{DateTime, Utc};\nuse futures::Stream;\nuse log::{debug, error, info, trace};\nuse prometheus::{Encoder, TextEncoder};\nuse serde::Deserialize;\nuse sodiumoxide::crypto::box_::{open_precomputed, Nonce, PrecomputedKey, NONCEBYTES};\nuse thiserror::Error;\n\nuse crate::cache::{Cache, CacheKey, ImageMetadata, UpstreamError};\nuse crate::client::{FetchResult, DEFAULT_HEADERS, HTTP_CLIENT};\nuse crate::config::{OFFLINE_MODE, VALIDATE_TOKENS};\nuse crate::metrics::{\n    CACHE_HIT_COUNTER, CACHE_MISS_COUNTER, REQUESTS_DATA_COUNTER, REQUESTS_DATA_SAVER_COUNTER,\n    REQUESTS_OTHER_COUNTER, REQUESTS_TOTAL_COUNTER,\n};\nuse crate::state::RwLockServerState;\n\nconst BASE64_CONFIG: base64::Config = base64::Config::new(base64::CharacterSet::UrlSafe, false);\n\npub enum ServerResponse {\n    TokenValidationError(TokenValidationError),\n    HttpResponse(HttpResponse),\n}\n\nimpl Responder for ServerResponse {\n    #[inline]\n    fn respond_to(self, req: \u0026HttpRequest) -\u003e HttpResponse {\n        match self {\n            Self::TokenValidationError(e) =\u003e e.respond_to(req),\n            Self::HttpResponse(resp) =\u003e {\n                REQUESTS_TOTAL_COUNTER.inc();\n                resp.respond_to(req)\n            }\n        }\n    }\n}\n\n#[allow(clippy::unused_async)]\n#[get(\"/\")]\nasync fn index() -\u003e impl Responder {\n    HttpResponse::Ok().body(include_str!(\"index.html\"))\n}\n\n#[allow(clippy::future_not_send)]\n#[get(\"/{token}/data/{chapter_hash}/{file_name}\")]\nasync fn token_data(\n    state: Data\u003cRwLockServerState\u003e,\n    cache: Data\u003cdyn Cache\u003e,\n    path: Path\u003c(String, String, String)\u003e,\n) -\u003e impl Responder {\n    REQUESTS_DATA_COUNTER.inc();\n    let (token, chapter_hash, file_name) = path.into_inner();\n    if VALIDATE_TOKENS.load(Ordering::Acquire) {\n        if let Err(e) = validate_token(\u0026state.0.read().precomputed_key, token, \u0026chapter_hash) {\n            return ServerResponse::TokenValidationError(e);\n        }\n    }\n    fetch_image(state, cache, chapter_hash, file_name, false).await\n}\n\n#[allow(clippy::future_not_send)]\n#[get(\"/{token}/data-saver/{chapter_hash}/{file_name}\")]\nasync fn token_data_saver(\n    state: Data\u003cRwLockServerState\u003e,\n    cache: Data\u003cdyn Cache\u003e,\n    path: Path\u003c(String, String, String)\u003e,\n) -\u003e impl Responder {\n    REQUESTS_DATA_SAVER_COUNTER.inc();\n    let (token, chapter_hash, file_name) = path.into_inner();\n    if VALIDATE_TOKENS.load(Ordering::Acquire) {\n        if let Err(e) = validate_token(\u0026state.0.read().precomputed_key, token, \u0026chapter_hash) {\n            return ServerResponse::TokenValidationError(e);\n        }\n    }\n\n    fetch_image(state, cache, chapter_hash, file_name, true).await\n}\n\n#[allow(clippy::future_not_send)]\npub async fn default(state: Data\u003cRwLockServerState\u003e, req: HttpRequest) -\u003e impl Responder {\n    REQUESTS_OTHER_COUNTER.inc();\n    let path = \u0026format!(\n        \"{}{}\",\n        state.0.read().image_server,\n        req.path().chars().skip(1).collect::\u003cString\u003e()\n    );\n\n    if OFFLINE_MODE.load(Ordering::Acquire) {\n        info!(\"Got unknown path in offline mode, returning 404: {}\", path);\n        return ServerResponse::HttpResponse(\n            ErrorNotFound(\"Path is not valid in offline mode\").into(),\n        );\n    }\n\n    info!(\"Got unknown path, just proxying: {}\", path);\n\n    let mut resp = match HTTP_CLIENT.inner().get(path).send().await {\n        Ok(resp) =\u003e resp,\n        Err(e) =\u003e {\n            error!(\"{}\", e);\n            return ServerResponse::HttpResponse(HttpResponse::BadGateway().finish());\n        }\n    };\n    let content_type = resp.headers_mut().remove(CONTENT_TYPE);\n    let mut resp_builder = HttpResponseBuilder::new(resp.status());\n    let mut headers = DEFAULT_HEADERS.clone();\n    if let Some(content_type) = content_type {\n        headers.insert(CONTENT_TYPE, content_type);\n    }\n    // push_headers(\u0026mut resp_builder);\n\n    let mut resp = resp_builder.body(resp.bytes().await.unwrap_or_default());\n    *resp.headers_mut() = headers;\n    ServerResponse::HttpResponse(resp)\n}\n\n#[allow(clippy::future_not_send, clippy::unused_async)]\n#[get(\"/metrics\")]\npub async fn metrics() -\u003e impl Responder {\n    let metric_families = prometheus::gather();\n    let mut buffer = Vec::new();\n    TextEncoder::new()\n        .encode(\u0026metric_families, \u0026mut buffer)\n        .unwrap();\n    String::from_utf8(buffer).unwrap()\n}\n\n#[derive(Error, Debug)]\npub enum TokenValidationError {\n    #[error(\"Failed to decode base64 token.\")]\n    DecodeError(#[from] DecodeError),\n    #[error(\"Nonce was too short.\")]\n    IncompleteNonce,\n    #[error(\"Invalid nonce.\")]\n    InvalidNonce,\n    #[error(\"Decryption failed\")]\n    DecryptionFailure,\n    #[error(\"The token format was invalid.\")]\n    InvalidToken,\n    #[error(\"The token has expired.\")]\n    TokenExpired,\n    #[error(\"Invalid chapter hash.\")]\n    InvalidChapterHash,\n}\n\nimpl Responder for TokenValidationError {\n    #[inline]\n    fn respond_to(self, _: \u0026HttpRequest) -\u003e HttpResponse {\n        let mut resp = HttpResponse::Forbidden().finish();\n        *resp.headers_mut() = DEFAULT_HEADERS.clone();\n        resp\n    }\n}\n\nfn validate_token(\n    precomputed_key: \u0026PrecomputedKey,\n    token: String,\n    chapter_hash: \u0026str,\n) -\u003e Result\u003c(), TokenValidationError\u003e {\n    #[derive(Deserialize)]\n    struct Token\u003c'a\u003e {\n        expires: DateTime\u003cUtc\u003e,\n        hash: \u0026'a str,\n    }\n\n    let data = base64::decode_config(token, BASE64_CONFIG)?;\n    if data.len() \u003c NONCEBYTES {\n        return Err(TokenValidationError::IncompleteNonce);\n    }\n\n    let (nonce, encrypted) = data.split_at(NONCEBYTES);\n\n    let nonce = Nonce::from_slice(nonce).ok_or(TokenValidationError::InvalidNonce)?;\n    let decrypted = open_precomputed(encrypted, \u0026nonce, precomputed_key)\n        .map_err(|_| TokenValidationError::DecryptionFailure)?;\n\n    let parsed_token: Token =\n        serde_json::from_slice(\u0026decrypted).map_err(|_| TokenValidationError::InvalidToken)?;\n\n    if parsed_token.expires \u003c Utc::now() {\n        return Err(TokenValidationError::TokenExpired);\n    }\n\n    if parsed_token.hash != chapter_hash {\n        return Err(TokenValidationError::InvalidChapterHash);\n    }\n\n    debug!(\"Token validated!\");\n\n    Ok(())\n}\n\n#[allow(clippy::future_not_send)]\nasync fn fetch_image(\n    state: Data\u003cRwLockServerState\u003e,\n    cache: Data\u003cdyn Cache\u003e,\n    chapter_hash: String,\n    file_name: String,\n    is_data_saver: bool,\n) -\u003e ServerResponse {\n    let key = CacheKey(chapter_hash, file_name, is_data_saver);\n\n    match cache.get(\u0026key).await {\n        Some(Ok((image, metadata))) =\u003e {\n            CACHE_HIT_COUNTER.inc();\n            return construct_response(image, \u0026metadata);\n        }\n        Some(Err(_)) =\u003e {\n            return ServerResponse::HttpResponse(HttpResponse::BadGateway().finish());\n        }\n        None =\u003e (),\n    }\n\n    CACHE_MISS_COUNTER.inc();\n\n    // If in offline mode, return early since there's nothing else we can do\n    if OFFLINE_MODE.load(Ordering::Acquire) {\n        return ServerResponse::HttpResponse(\n            ErrorNotFound(\"Offline mode enabled and image not in cache\").into(),\n        );\n    }\n\n    let url = if is_data_saver {\n        format!(\n            \"{}/data-saver/{}/{}\",\n            state.0.read().image_server,\n            \u0026key.0,\n            \u0026key.1,\n        )\n    } else {\n        format!(\"{}/data/{}/{}\", state.0.read().image_server, \u0026key.0, \u0026key.1)\n    };\n\n    match HTTP_CLIENT.fetch_and_cache(url, key, cache).await {\n        FetchResult::ServiceUnavailable =\u003e {\n            ServerResponse::HttpResponse(HttpResponse::ServiceUnavailable().finish())\n        }\n        FetchResult::InternalServerError =\u003e {\n            ServerResponse::HttpResponse(HttpResponse::InternalServerError().finish())\n        }\n        FetchResult::Data(status, headers, data) =\u003e {\n            let mut resp = HttpResponseBuilder::new(status);\n            let mut resp = resp.body(data);\n            *resp.headers_mut() = headers;\n            ServerResponse::HttpResponse(resp)\n        }\n        FetchResult::Processing =\u003e panic!(\"Race condition found with fetch result\"),\n    }\n}\n\n#[inline]\npub fn construct_response(\n    data: impl Stream\u003cItem = Result\u003cBytes, UpstreamError\u003e\u003e + Unpin + 'static,\n    metadata: \u0026ImageMetadata,\n) -\u003e ServerResponse {\n    trace!(\"Constructing response\");\n\n    let mut resp = HttpResponse::Ok();\n\n    let mut headers = DEFAULT_HEADERS.clone();\n    if let Some(content_type) = metadata.content_type {\n        headers.insert(\n            CONTENT_TYPE,\n            HeaderValue::from_str(content_type.as_ref()).unwrap(),\n        );\n    }\n\n    if let Some(content_length) = metadata.content_length {\n        headers.insert(CONTENT_LENGTH, HeaderValue::from(content_length));\n    }\n\n    if let Some(last_modified) = metadata.last_modified {\n        headers.insert(\n            LAST_MODIFIED,\n            HeaderValue::from_str(\u0026last_modified.to_rfc2822()).unwrap(),\n        );\n    }\n\n    let mut ret = resp.streaming(data);\n    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OnceCell\u003cArcSwap\u003cBox\u003cdyn SigningKey\u003e\u003e\u003e = OnceCell::new();\npub static TLS_CERTS: OnceCell\u003cArcSwap\u003cVec\u003cCertificate\u003e\u003e\u003e = OnceCell::new();\n\n#[derive(Error, Debug)]\npub enum ServerInitError {\n    #[error(transparent)]\n    MalformedResponse(reqwest::Error),\n    #[error(transparent)]\n    Timeout(reqwest::Error),\n    #[error(transparent)]\n    SendFailure(reqwest::Error),\n    #[error(\"Failed to parse token key\")]\n    KeyParseError(String),\n    #[error(\"Token key was not provided in initial request\")]\n    MissingTokenKey,\n    #[error(\"Got error response from control center\")]\n    ErrorResponse,\n}\n\nimpl ServerState {\n    pub async fn init(secret: \u0026ClientSecret, config: \u0026Config) -\u003e Result\u003cSelf, ServerInitError\u003e {\n        let resp = reqwest::Client::new()\n            .post(CONTROL_CENTER_PING_URL)\n            .json(\u0026Request::from((secret, config)))\n            .send()\n            .await;\n\n        match resp {\n            Ok(resp) =\u003e match resp.json::\u003cResponse\u003e().await {\n                Ok(Response::Ok(mut resp)) =\u003e {\n                    let key = resp\n                        .token_key\n                        .ok_or(ServerInitError::MissingTokenKey)\n                        .and_then(|key| {\n                            if let Some(key) = base64::decode(\u0026key)\n                                .ok()\n                                .and_then(|k| PrecomputedKey::from_slice(\u0026k))\n                            {\n                                Ok(key)\n                            } else {\n                                error!(\"Failed to parse token key: got {}\", key);\n                                Err(ServerInitError::KeyParseError(key))\n                            }\n                        })?;\n\n                    PREVIOUSLY_COMPROMISED.store(resp.compromised, Ordering::Release);\n                    if resp.compromised {\n                        error!(\"Got compromised response from control center!\");\n                    }\n\n                    PREVIOUSLY_PAUSED.store(resp.paused, Ordering::Release);\n                    if resp.paused {\n                        warn!(\"Control center has paused this node!\");\n                    }\n\n                    if let Some(ref override_url) = config.override_upstream {\n                        resp.image_server = override_url.clone();\n                        warn!(\"Upstream URL overridden to: {}\", resp.image_server);\n                    } else {\n                    }\n\n                    info!(\"This client's URL has been set to {}\", resp.url);\n\n                    if config\n                        .unstable_options\n                        .contains(\u0026UnstableOptions::DisableTokenValidation)\n                    {\n                        warn!(\"Token validation is explicitly disabled!\");\n                    } else {\n                        if resp.force_tokens {\n                            info!(\"This client will validate tokens.\");\n                        } else {\n                            info!(\"This client will not validate tokens.\");\n                        }\n                        VALIDATE_TOKENS.store(resp.force_tokens, Ordering::Release);\n                    }\n\n                    let tls = resp.tls.unwrap();\n                    std::mem::drop(\n                        TLS_PREVIOUSLY_CREATED.set(ArcSwap::from_pointee(tls.created_at)),\n                    );\n                    std::mem::drop(TLS_SIGNING_KEY.set(ArcSwap::new(tls.priv_key)));\n                    std::mem::drop(TLS_CERTS.set(ArcSwap::from_pointee(tls.certs)));\n\n                    Ok(Self {\n                        precomputed_key: key,\n                        image_server: resp.image_server,\n                        url: resp.url,\n                        url_overridden: config.override_upstream.is_some(),\n                    })\n                }\n                Ok(Response::Error(resp)) =\u003e {\n                    error!(\n                        \"Got an {} error from upstream: {}\",\n                        resp.status as u16, resp.error\n                    );\n                    Err(ServerInitError::ErrorResponse)\n                }\n                Err(e) =\u003e {\n                    error!(\"Got malformed response: {}. Is MangaDex@Home down?\", e);\n                    Err(ServerInitError::MalformedResponse(e))\n                }\n            },\n            Err(e) =\u003e match e {\n                e if e.is_timeout() =\u003e {\n                    error!(\"Response timed out to control server. Is MangaDex@Home down?\");\n                    Err(ServerInitError::Timeout(e))\n                }\n                e =\u003e {\n                    error!(\"Failed to send request: {}\", e);\n                    Err(ServerInitError::SendFailure(e))\n                }\n            },\n        }\n    }\n\n    pub fn init_offline() -\u003e Self {\n        assert!(OFFLINE_MODE.load(Ordering::Acquire));\n        Self {\n            precomputed_key: PrecomputedKey::from_slice(\u0026[41; PRECOMPUTEDKEYBYTES]).unwrap(),\n            image_server: Url::from_file_path(\"/dev/null\").unwrap(),\n            url: Url::from_str(\"http://localhost\").unwrap(),\n            url_overridden: false,\n        }\n    }\n}\n\npub struct RwLockServerState(pub RwLock\u003cServerState\u003e);\n\npub struct DynamicServerCert;\n\nimpl ResolvesServerCert for DynamicServerCert {\n    fn resolve(\u0026self, _: ClientHello) -\u003e Option\u003cCertifiedKey\u003e {\n        // TODO: wait for actix-web to use a new version of rustls so we can\n        // remove cloning the certs all the time\n        Some(CertifiedKey {\n            cert: TLS_CERTS.get().unwrap().load().as_ref().clone(),\n            key: TLS_SIGNING_KEY.get().unwrap().load_full(),\n            ocsp: None,\n            sct_list: None,\n        })\n    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log::{info, warn};\nuse reqwest::StatusCode;\nuse serde::Serialize;\n\nuse crate::config::ClientSecret;\n\nconst CONTROL_CENTER_STOP_URL: \u0026str = \"https://api.mangadex.network/ping\";\n\n#[derive(Serialize)]\nstruct StopRequest\u003c'a\u003e {\n    secret: \u0026'a ClientSecret,\n}\n\npub async fn send_stop(secret: \u0026ClientSecret) {\n    let request = StopRequest { secret };\n    let client = reqwest::Client::new();\n    match client\n        .post(CONTROL_CENTER_STOP_URL)\n        .json(\u0026request)\n        .send()\n        .await\n    {\n        Ok(resp) =\u003e {\n            if resp.status() == StatusCode::OK {\n                info!(\"Successfully sent stop message to control center.\");\n            } else {\n                warn!(\"Got weird response from server: {:?}\", resp.headers());\n            }\n        }\n        Err(e) =\u003e warn!(\"Got error while sending stop message: {}\", e),\n    }\n}\n","traces":[{"line":14,"address":[4530999,4530960,4532986,4533029,4530896,4530918],"length":1,"stats":{"Line":0},"fn_name":"send_stop"},{"line":15,"address":[4531073],"length":1,"stats":{"Line":0},"fn_name":null},{"line":16,"address":[4531077],"length":1,"stats":{"Line":0},"fn_name":null},{"line":17,"address":[4532908,4531138,4531621,4533016,4531305,4531197],"length":1,"stats":{"Line":0},"fn_name":null},{"line":19,"address":[4531177],"length":1,"stats":{"Line":0},"fn_name":null},{"line":23,"address":[4531623,4531544],"length":1,"stats":{"Line":0},"fn_name":null},{"line":24,"address":[4532417,4532053,4531663],"length":1,"stats":{"Line":0},"fn_name":null},{"line":25,"address":[4531735,4531821,4531897],"length":1,"stats":{"Line":0},"fn_name":null},{"line":27,"address":[4531778,4532058,4532134],"length":1,"stats":{"Line":0},"fn_name":null},{"line":30,"address":[4532441,4532850,4531559,4532517],"length":1,"stats":{"Line":0},"fn_name":null}],"covered":0,"coverable":10},{"path":["/","home","edward","Documents","repos","mangadex-home","src","units.rs"],"content":"use std::fmt::Display;\nuse std::num::{NonZeroU16, NonZeroU64, ParseIntError};\nuse std::str::FromStr;\n\nuse serde::{Deserialize, Serialize};\n\n/// Wrapper type for a port number.\n#[derive(Serialize, Deserialize, Debug, Clone, Copy)]\npub struct Port(NonZeroU16);\n\nimpl Port {\n    pub const fn get(self) -\u003e u16 {\n        self.0.get()\n    }\n}\n\nimpl Default for Port {\n    fn default() -\u003e Self {\n        Self(unsafe { NonZeroU16::new_unchecked(443) })\n    }\n}\n\nimpl FromStr for Port {\n    type Err = \u003cNonZeroU16 as FromStr\u003e::Err;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        NonZeroU16::from_str(s).map(Self)\n    }\n}\n\nimpl Display for Port {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        self.0.fmt(f)\n    }\n}\n\n#[derive(Copy, Clone, Serialize, Deserialize, Default, Debug, Hash, Eq, PartialEq)]\npub struct Mebibytes(usize);\n\nimpl FromStr for Mebibytes {\n    type Err = ParseIntError;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        s.parse::\u003cusize\u003e().map(Self)\n    }\n}\n\npub struct Bytes(usize);\n\nimpl Bytes {\n    pub const fn get(\u0026self) -\u003e usize {\n        self.0\n    }\n}\n\nimpl From\u003cMebibytes\u003e for Bytes {\n    fn from(mib: Mebibytes) -\u003e Self {\n        Self(mib.0 \u003c\u003c 20)\n    }\n}\n\n#[derive(Copy, Clone, Deserialize, Debug, Hash, Eq, PartialEq)]\npub struct KilobitsPerSecond(NonZeroU64);\n\nimpl FromStr for KilobitsPerSecond {\n    type Err = ParseIntError;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        s.parse::\u003cNonZeroU64\u003e().map(Self)\n    }\n}\n\n#[derive(Copy, Clone, Serialize, Debug, Hash, Eq, PartialEq)]\npub struct BytesPerSecond(NonZeroU64);\n\nimpl From\u003cKilobitsPerSecond\u003e for BytesPerSecond {\n    fn from(kbps: KilobitsPerSecond) -\u003e Self {\n        Self(unsafe { NonZeroU64::new_unchecked(kbps.0.get() * 125) })\n    }\n}\n","traces":[{"line":12,"address":[4126240],"length":1,"stats":{"Line":0},"fn_name":"get"},{"line":13,"address":[4126249],"length":1,"stats":{"Line":0},"fn_name":null},{"line":18,"address":[4126272],"length":1,"stats":{"Line":1},"fn_name":"default"},{"line":19,"address":[4126273],"length":1,"stats":{"Line":1},"fn_name":null},{"line":26,"address":[4126320],"length":1,"stats":{"Line":0},"fn_name":"from_str"},{"line":27,"address":[4126334],"length":1,"stats":{"Line":0},"fn_name":null},{"line":32,"address":[4126384],"length":1,"stats":{"Line":0},"fn_name":"fmt"},{"line":33,"address":[4126398],"length":1,"stats":{"Line":0},"fn_name":null},{"line":43,"address":[4126432],"length":1,"stats":{"Line":0},"fn_name":"from_str"},{"line":44,"address":[4126446],"length":1,"stats":{"Line":0},"fn_name":null},{"line":51,"address":[4126560],"length":1,"stats":{"Line":0},"fn_name":"get"},{"line":52,"address":[4126565],"length":1,"stats":{"Line":0},"fn_name":null},{"line":57,"address":[4126576],"length":1,"stats":{"Line":0},"fn_name":"from"},{"line":58,"address":[4126585],"length":1,"stats":{"Line":0},"fn_name":null},{"line":68,"address":[4126624],"length":1,"stats":{"Line":0},"fn_name":"from_str"},{"line":69,"address":[4126638],"length":1,"stats":{"Line":0},"fn_name":null},{"line":77,"address":[4126736],"length":1,"stats":{"Line":0},"fn_name":"from"},{"line":78,"address":[4126813,4126745],"length":1,"stats":{"Line":0},"fn_name":null}],"covered":2,"coverable":18}]};
-        var previousData = {"files":[{"path":["/","home","edward","Documents","repos","mangadex-home","build.rs"],"content":"use std::error::Error;\n\nuse vergen::{vergen, Config, ShaKind};\n\nfn main() -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n    // Initialize vergen stuff\n    let mut config = Config::default();\n    *config.git_mut().sha_kind_mut() = ShaKind::Short;\n    vergen(config)?;\n\n    Ok(())\n}\n","traces":[],"covered":0,"coverable":0},{"path":["/","home","edward","Documents","repos","mangadex-home","src","cache","compat.rs"],"content":"//! These structs have alternative deserialize and serializations\n//! implementations to assist reading from the official client file format.\n\nuse std::str::FromStr;\n\nuse chrono::{DateTime, FixedOffset};\nuse serde::de::{Unexpected, Visitor};\nuse serde::{Deserialize, Serialize};\n\nuse super::ImageContentType;\n\n#[derive(Copy, Clone, Deserialize)]\npub struct LegacyImageMetadata {\n    pub(crate) content_type: Option\u003cLegacyImageContentType\u003e,\n    pub(crate) size: Option\u003cu32\u003e,\n    pub(crate) last_modified: Option\u003cLegacyDateTime\u003e,\n}\n\n#[derive(Copy, Clone, Serialize)]\npub struct LegacyDateTime(pub DateTime\u003cFixedOffset\u003e);\n\nimpl\u003c'de\u003e Deserialize\u003c'de\u003e for LegacyDateTime {\n    fn deserialize\u003cD\u003e(deserializer: D) -\u003e Result\u003cSelf, D::Error\u003e\n    where\n        D: serde::Deserializer\u003c'de\u003e,\n    {\n        struct LegacyDateTimeVisitor;\n\n        impl\u003c'de\u003e Visitor\u003c'de\u003e for LegacyDateTimeVisitor {\n            type Value = LegacyDateTime;\n\n            fn expecting(\u0026self, f: \u0026mut std::fmt::Formatter) -\u003e std::fmt::Result {\n                write!(f, \"a valid image type\")\n            }\n\n            fn visit_str\u003cE\u003e(self, v: \u0026str) -\u003e Result\u003cSelf::Value, E\u003e\n            where\n                E: serde::de::Error,\n            {\n                DateTime::parse_from_rfc2822(v)\n                    .map(LegacyDateTime)\n                    .map_err(|_| E::invalid_value(Unexpected::Str(v), \u0026\"a valid image type\"))\n            }\n        }\n\n        deserializer.deserialize_str(LegacyDateTimeVisitor)\n    }\n}\n\n#[derive(Copy, Clone)]\npub struct LegacyImageContentType(pub ImageContentType);\n\nimpl\u003c'de\u003e Deserialize\u003c'de\u003e for LegacyImageContentType {\n    fn deserialize\u003cD\u003e(deserializer: D) -\u003e Result\u003cSelf, D::Error\u003e\n    where\n        D: serde::Deserializer\u003c'de\u003e,\n    {\n        struct LegacyImageContentTypeVisitor;\n\n        impl\u003c'de\u003e Visitor\u003c'de\u003e for LegacyImageContentTypeVisitor {\n            type Value = LegacyImageContentType;\n\n            fn expecting(\u0026self, f: \u0026mut std::fmt::Formatter) -\u003e std::fmt::Result {\n                write!(f, \"a valid image type\")\n            }\n\n            fn visit_str\u003cE\u003e(self, v: \u0026str) -\u003e Result\u003cSelf::Value, E\u003e\n            where\n                E: serde::de::Error,\n            {\n                ImageContentType::from_str(v)\n                    .map(LegacyImageContentType)\n                    .map_err(|_| E::invalid_value(Unexpected::Str(v), \u0026\"a valid image type\"))\n            }\n        }\n\n        deserializer.deserialize_str(LegacyImageContentTypeVisitor)\n    }\n}\n","traces":[{"line":23,"address":[4324992],"length":1,"stats":{"Line":1},"fn_name":"deserialize\u003c\u0026mut serde_json::de::Deserializer\u003cserde_json::read::IoRead\u003cstd::fs::File\u003e\u003e\u003e"},{"line":29,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":30,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":32,"address":[4325024],"length":1,"stats":{"Line":0},"fn_name":"expecting"},{"line":33,"address":[4325043],"length":1,"stats":{"Line":0},"fn_name":null},{"line":36,"address":[4325120],"length":1,"stats":{"Line":1},"fn_name":"visit_str\u003cserde_json::error::Error\u003e"},{"line":40,"address":[4325144,4325195],"length":1,"stats":{"Line":2},"fn_name":null},{"line":41,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":42,"address":[4325185,4325232,4325248],"length":1,"stats":{"Line":1},"fn_name":"{{closure}}\u003cserde_json::error::Error\u003e"},{"line":46,"address":[4325009],"length":1,"stats":{"Line":1},"fn_name":null},{"line":54,"address":[4325312],"length":1,"stats":{"Line":1},"fn_name":"deserialize\u003c\u0026mut serde_json::de::Deserializer\u003cserde_json::read::IoRead\u003cstd::fs::File\u003e\u003e\u003e"},{"line":60,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":61,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":63,"address":[4325376],"length":1,"stats":{"Line":0},"fn_name":"expecting"},{"line":64,"address":[4325395],"length":1,"stats":{"Line":0},"fn_name":null},{"line":67,"address":[4325472],"length":1,"stats":{"Line":1},"fn_name":"visit_str\u003cserde_json::error::Error\u003e"},{"line":71,"address":[4325535,4325486],"length":1,"stats":{"Line":2},"fn_name":null},{"line":72,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":73,"address":[4325530,4325609,4325600],"length":1,"stats":{"Line":1},"fn_name":"{{closure}}\u003cserde_json::error::Error\u003e"},{"line":77,"address":[4325321],"length":1,"stats":{"Line":1},"fn_name":null}],"covered":10,"coverable":20},{"path":["/","home","edward","Documents","repos","mangadex-home","src","cache","disk.rs"],"content":"//! Low memory caching stuff\n\nuse std::convert::TryFrom;\nuse std::hint::unreachable_unchecked;\nuse std::os::unix::prelude::OsStrExt;\nuse std::path::{Path, PathBuf};\nuse std::str::FromStr;\nuse std::sync::atomic::{AtomicU64, Ordering};\nuse std::sync::Arc;\n\nuse async_trait::async_trait;\nuse futures::StreamExt;\nuse log::{debug, error, warn, LevelFilter};\nuse md5::digest::generic_array::GenericArray;\nuse md5::{Digest, Md5};\nuse sqlx::sqlite::SqliteConnectOptions;\nuse sqlx::{ConnectOptions, Sqlite, SqlitePool, Transaction};\nuse tokio::fs::remove_file;\nuse tokio::sync::mpsc::{channel, Receiver, Sender};\nuse tokio_stream::wrappers::ReceiverStream;\n\nuse crate::units::Bytes;\n\nuse super::{Cache, CacheError, CacheKey, CacheStream, CallbackCache, ImageMetadata};\n\npub struct DiskCache {\n    disk_path: PathBuf,\n    disk_cur_size: AtomicU64,\n    db_update_channel_sender: Sender\u003cDbMessage\u003e,\n}\n\nenum DbMessage {\n    Get(Arc\u003cPathBuf\u003e),\n    Put(Arc\u003cPathBuf\u003e, u64),\n}\n\nimpl DiskCache {\n    /// Constructs a new low memory cache at the provided path and capacity.\n    /// This internally spawns a task that will wait for filesystem\n    /// notifications when a file has been written.\n    pub async fn new(disk_max_size: Bytes, disk_path: PathBuf) -\u003e Arc\u003cSelf\u003e {\n        let (db_tx, db_rx) = channel(128);\n        let db_pool = {\n            let db_url = format!(\"sqlite:{}/metadata.sqlite\", disk_path.to_string_lossy());\n            let mut options = SqliteConnectOptions::from_str(\u0026db_url)\n                .unwrap()\n                .create_if_missing(true);\n            options.log_statements(LevelFilter::Trace);\n            let db = SqlitePool::connect_with(options).await.unwrap();\n\n            // Run db init\n            sqlx::query_file!(\"./db_queries/init.sql\")\n                .execute(\u0026mut db.acquire().await.unwrap())\n                .await\n                .unwrap();\n\n            db\n        };\n\n        // This is intentional.\n        #[allow(clippy::cast_sign_loss)]\n        let disk_cur_size = {\n            let mut conn = db_pool.acquire().await.unwrap();\n            sqlx::query!(\"SELECT IFNULL(SUM(size), 0) AS size FROM Images\")\n                .fetch_one(\u0026mut conn)\n                .await\n                .map(|record| record.size)\n                .unwrap_or_default()\n                .unwrap_or_default() as u64\n        };\n\n        let new_self = Arc::new(Self {\n            disk_path,\n            disk_cur_size: AtomicU64::new(disk_cur_size),\n            db_update_channel_sender: db_tx,\n        });\n\n        // maybe this is better? in theory this sounds like it should be faster\n        // but in practice I haven't seen any perf improvements\n\n        // let ret = Arc::clone(\u0026new_self);\n        // std::thread::spawn(move || {\n        //     tokio::runtime::Builder::new_current_thread()\n        //         .enable_all()\n        //         .build()\n        //         .unwrap()\n        //         .block_on(db_listener(\n        //             Arc::clone(\u0026new_self),\n        //             db_rx,\n        //             db_pool,\n        //             disk_max_size.get() as u64 / 20 * 19,\n        //         ))\n        // });\n        // ret\n\n        tokio::spawn(db_listener(\n            Arc::clone(\u0026new_self),\n            db_rx,\n            db_pool,\n            disk_max_size.get() as u64 / 20 * 19,\n        ));\n\n        new_self\n    }\n\n    #[cfg(test)]\n    fn in_memory() -\u003e (Self, Receiver\u003cDbMessage\u003e) {\n        let (db_tx, db_rx) = channel(128);\n        (\n            Self {\n                disk_path: PathBuf::new(),\n                disk_cur_size: AtomicU64::new(0),\n                db_update_channel_sender: db_tx,\n            },\n            db_rx,\n        )\n    }\n}\n\n/// Spawn a new task that will listen for updates to the db, pruning if the size\n/// becomes too large.\nasync fn db_listener(\n    cache: Arc\u003cDiskCache\u003e,\n    db_rx: Receiver\u003cDbMessage\u003e,\n    db_pool: SqlitePool,\n    max_on_disk_size: u64,\n) {\n    let mut recv_stream = ReceiverStream::new(db_rx).ready_chunks(128);\n    while let Some(messages) = recv_stream.next().await {\n        let mut transaction = match db_pool.begin().await {\n            Ok(transaction) =\u003e transaction,\n            Err(e) =\u003e {\n                error!(\"Failed to start a transaction to DB, cannot update DB. Disk cache may be losing track of files! {}\", e);\n                continue;\n            }\n        };\n\n        for message in messages {\n            match message {\n                DbMessage::Get(entry) =\u003e handle_db_get(\u0026entry, \u0026mut transaction).await,\n                DbMessage::Put(entry, size) =\u003e {\n                    handle_db_put(\u0026entry, size, \u0026cache, \u0026mut transaction).await;\n                }\n            }\n        }\n\n        if let Err(e) = transaction.commit().await {\n            error!(\n                \"Failed to commit transaction to DB. Disk cache may be losing track of files! {}\",\n                e\n            );\n        }\n\n        let on_disk_size = (cache.disk_cur_size.load(Ordering::Acquire) + 4095) / 4096 * 4096;\n        if on_disk_size \u003e= max_on_disk_size {\n            let mut conn = match db_pool.acquire().await {\n                Ok(conn) =\u003e conn,\n                Err(e) =\u003e {\n                    error!(\n                        \"Failed to get a DB connection and cannot prune disk cache: {}\",\n                        e\n                    );\n                    continue;\n                }\n            };\n\n            let items = {\n                let request =\n                    sqlx::query!(\"select id, size from Images order by accessed asc limit 1000\")\n                        .fetch_all(\u0026mut conn)\n                        .await;\n                match request {\n                    Ok(items) =\u003e items,\n                    Err(e) =\u003e {\n                        error!(\n                            \"Failed to fetch oldest images and cannot prune disk cache: {}\",\n                            e\n                        );\n                        continue;\n                    }\n                }\n            };\n\n            let mut size_freed = 0;\n            #[allow(clippy::cast_sign_loss)]\n            for item in items {\n                debug!(\"deleting file due to exceeding cache size\");\n                size_freed += item.size as u64;\n                tokio::spawn(async move {\n                    let key = item.id;\n                    if let Err(e) = remove_file(key.clone()).await {\n                        match e.kind() {\n                            std::io::ErrorKind::NotFound =\u003e {\n                                let hash = Md5Hash(*GenericArray::from_slice(key.as_bytes()));\n                                let path: PathBuf = hash.into();\n                                if let Err(e) = remove_file(\u0026path).await {\n                                    warn!(\n                                        \"Failed to delete file `{}` from cache: {}\",\n                                        path.to_string_lossy(),\n                                        e\n                                    );\n                                }\n                            }\n                            _ =\u003e {\n                                warn!(\"Failed to delete file `{}` from cache: {}\", \u0026key, e);\n                            }\n                        }\n                    }\n                });\n            }\n\n            cache.disk_cur_size.fetch_sub(size_freed, Ordering::Release);\n        }\n    }\n}\n\nasync fn handle_db_get(entry: \u0026Path, transaction: \u0026mut Transaction\u003c'_, Sqlite\u003e) {\n    let hash = if let Ok(hash) = Md5Hash::try_from(entry) {\n        hash\n    } else {\n        error!(\n            \"Failed to derive hash from entry, dropping message: {}\",\n            entry.to_string_lossy()\n        );\n        return;\n    };\n\n    let hash_str = hash.to_hex_string();\n    let key = entry.as_os_str().to_str();\n    let now = chrono::Utc::now();\n    let query = sqlx::query!(\n        \"update Images set accessed = ? where id = ? or id = ?\",\n        now,\n        key,\n        hash_str\n    )\n    .execute(transaction)\n    .await;\n    if let Err(e) = query {\n        warn!(\"Failed to update timestamp in db for {:?}: {}\", key, e);\n    }\n}\n\nasync fn handle_db_put(\n    entry: \u0026Path,\n    size: u64,\n    cache: \u0026DiskCache,\n    transaction: \u0026mut Transaction\u003c'_, Sqlite\u003e,\n) {\n    let key = entry.as_os_str().to_str();\n    let now = chrono::Utc::now();\n\n    // This is intentional.\n    #[allow(clippy::cast_possible_wrap)]\n    let casted_size = size as i64;\n    let query = sqlx::query!(\n        \"insert into Images (id, size, accessed) values (?, ?, ?) on conflict do nothing\",\n        key,\n        casted_size,\n        now,\n    )\n    .execute(transaction)\n    .await;\n\n    if let Err(e) = query {\n        warn!(\"Failed to add {:?} to db: {}\", key, e);\n    }\n\n    cache.disk_cur_size.fetch_add(size, Ordering::Release);\n}\n\n/// Represents a Md5 hash that can be converted to and from a path. This is used\n/// for compatibility with the official client, where the image id and on-disk\n/// path is determined by file path.\n#[derive(Clone, Copy, PartialEq, Eq, Debug)]\nstruct Md5Hash(GenericArray\u003cu8, \u003cMd5 as md5::Digest\u003e::OutputSize\u003e);\n\nimpl Md5Hash {\n    fn to_hex_string(self) -\u003e String {\n        format!(\"{:x}\", self.0)\n    }\n}\n\nimpl TryFrom\u003c\u0026Path\u003e for Md5Hash {\n    type Error = ();\n\n    fn try_from(path: \u0026Path) -\u003e Result\u003cSelf, Self::Error\u003e {\n        let mut iter = path.iter();\n        let file_name = iter.next_back().ok_or(())?;\n        let chapter_hash = iter.next_back().ok_or(())?;\n        let is_data_saver = iter.next_back().ok_or(())? == \"saver\";\n        let mut hasher = Md5::new();\n        if is_data_saver {\n            hasher.update(\"saver\");\n        }\n        hasher.update(chapter_hash.as_bytes());\n        hasher.update(\".\");\n        hasher.update(file_name.as_bytes());\n        Ok(Self(hasher.finalize()))\n    }\n}\n\nimpl From\u003cMd5Hash\u003e for PathBuf {\n    fn from(hash: Md5Hash) -\u003e Self {\n        let hex_value = dbg!(hash.to_hex_string());\n        let path = hex_value[0..3]\n            .chars()\n            .rev()\n            .map(|char| Self::from(char.to_string()))\n            .reduce(|first, second| first.join(second));\n\n        match path {\n            Some(p) =\u003e p.join(hex_value),\n            None =\u003e unsafe { unreachable_unchecked() }, // literally not possible\n        }\n    }\n}\n\n#[async_trait]\nimpl Cache for DiskCache {\n    async fn get(\n        \u0026self,\n        key: \u0026CacheKey,\n    ) -\u003e Option\u003cResult\u003c(CacheStream, ImageMetadata), CacheError\u003e\u003e {\n        let channel = self.db_update_channel_sender.clone();\n\n        let path = Arc::new(self.disk_path.clone().join(PathBuf::from(key)));\n        let path_0 = Arc::clone(\u0026path);\n\n        tokio::spawn(async move { channel.send(DbMessage::Get(path_0)).await });\n\n        super::fs::read_file_from_path(\u0026path).await.map(|res| {\n            let (inner, maybe_header, metadata) = res?;\n            CacheStream::new(inner, maybe_header)\n                .map(|stream| (stream, metadata))\n                .map_err(|_| CacheError::DecryptionFailure)\n        })\n    }\n\n    async fn put(\n        \u0026self,\n        key: CacheKey,\n        image: bytes::Bytes,\n        metadata: ImageMetadata,\n    ) -\u003e Result\u003c(), CacheError\u003e {\n        let channel = self.db_update_channel_sender.clone();\n\n        let path = Arc::new(self.disk_path.clone().join(PathBuf::from(\u0026key)));\n        let path_0 = Arc::clone(\u0026path);\n\n        let db_callback = |size: u64| async move {\n            std::mem::drop(channel.send(DbMessage::Put(path_0, size)).await);\n        };\n\n        super::fs::write_file(\u0026path, key, image, metadata, db_callback, None)\n            .await\n            .map_err(CacheError::from)\n    }\n}\n\n#[async_trait]\nimpl CallbackCache for DiskCache {\n    async fn put_with_on_completed_callback(\n        \u0026self,\n        key: CacheKey,\n        image: bytes::Bytes,\n        metadata: ImageMetadata,\n        on_complete: Sender\u003c(CacheKey, bytes::Bytes, ImageMetadata, u64)\u003e,\n    ) -\u003e Result\u003c(), CacheError\u003e {\n        let channel = self.db_update_channel_sender.clone();\n\n        let path = Arc::new(self.disk_path.clone().join(PathBuf::from(\u0026key)));\n        let path_0 = Arc::clone(\u0026path);\n\n        let db_callback = |size: u64| async move {\n            // We don't care about the result of the send\n            std::mem::drop(channel.send(DbMessage::Put(path_0, size)).await);\n        };\n\n        super::fs::write_file(\u0026path, key, image, metadata, db_callback, Some(on_complete))\n            .await\n            .map_err(CacheError::from)\n    }\n}\n\n#[cfg(test)]\nmod db {\n    use chrono::{DateTime, Utc};\n    use sqlx::{Connection, Row, SqliteConnection};\n    use std::error::Error;\n\n    use super::*;\n\n    #[tokio::test]\n    async fn get() -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n        let (cache, _) = DiskCache::in_memory();\n        let path = PathBuf::from_str(\"a/b/c\")?;\n        let mut conn = SqliteConnection::connect(\"sqlite::memory:\").await?;\n        sqlx::query_file!(\"./db_queries/init.sql\")\n            .execute(\u0026mut conn)\n            .await?;\n\n        // Add an entry\n        let mut transaction = conn.begin().await?;\n        handle_db_put(\u0026path, 10, \u0026cache, \u0026mut transaction).await;\n        transaction.commit().await?;\n\n        let time_fence = Utc::now();\n\n        let mut transaction = conn.begin().await?;\n        handle_db_get(\u0026path, \u0026mut transaction).await;\n        transaction.commit().await?;\n\n        let mut rows: Vec\u003c_\u003e = sqlx::query(\"select * from Images\")\n            .fetch(\u0026mut conn)\n            .collect()\n            .await;\n        assert_eq!(rows.len(), 1);\n        let entry = rows.pop().unwrap()?;\n        assert!(time_fence \u003c entry.get::\u003c'_, DateTime\u003cUtc\u003e, _\u003e(\"accessed\"));\n\n        Ok(())\n    }\n\n    #[tokio::test]\n    async fn put() -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n        let (cache, _) = DiskCache::in_memory();\n        let path = PathBuf::from_str(\"a/b/c\")?;\n        let mut conn = SqliteConnection::connect(\"sqlite::memory:\").await?;\n        sqlx::query_file!(\"./db_queries/init.sql\")\n            .execute(\u0026mut conn)\n            .await?;\n\n        let mut transaction = conn.begin().await?;\n        let transaction_time = Utc::now();\n        handle_db_put(\u0026path, 10, \u0026cache, \u0026mut transaction).await;\n        transaction.commit().await?;\n\n        let mut rows: Vec\u003c_\u003e = sqlx::query(\"select * from Images\")\n            .fetch(\u0026mut conn)\n            .collect()\n            .await;\n        assert_eq!(rows.len(), 1);\n\n        let entry = rows.pop().unwrap()?;\n        assert_eq!(entry.get::\u003c'_, \u0026str, _\u003e(\"id\"), \"a/b/c\");\n        assert_eq!(entry.get::\u003c'_, i64, _\u003e(\"size\"), 10);\n\n        let accessed: DateTime\u003cUtc\u003e = entry.get(\"accessed\");\n        assert!(transaction_time \u003c accessed);\n        assert!(accessed \u003c Utc::now());\n\n        assert_eq!(cache.disk_cur_size.load(Ordering::SeqCst), 10);\n\n        Ok(())\n    }\n}\n\n#[cfg(test)]\nmod md5_hash {\n    use super::*;\n\n    #[test]\n    fn to_cache_path() {\n        let hash = Md5Hash(\n            *GenericArray::\u003c_, \u003cMd5 as md5::Digest\u003e::OutputSize\u003e::from_slice(\u0026[\n                0xab, 0xcd, 0xef, 0xab, 0xcd, 0xef, 0xab, 0xcd, 0xef, 0xab, 0xcd, 0xef, 0xab, 0xcd,\n                0xef, 0xab,\n            ]),\n        );\n        assert_eq!(\n            PathBuf::from(hash).to_str(),\n            Some(\"c/b/a/abcdefabcdefabcdefabcdefabcdefab\")\n        )\n    }\n\n    #[test]\n    fn from_data_path() {\n        let mut expected_hasher = Md5::new();\n        expected_hasher.update(\"foo.bar.png\");\n        assert_eq!(\n            Md5Hash::try_from(Path::new(\"data/foo/bar.png\")),\n            Ok(Md5Hash(expected_hasher.finalize()))\n        );\n    }\n\n    #[test]\n    fn from_data_saver_path() {\n        let mut expected_hasher = Md5::new();\n        expected_hasher.update(\"saverfoo.bar.png\");\n        assert_eq!(\n            Md5Hash::try_from(Path::new(\"saver/foo/bar.png\")),\n            Ok(Md5Hash(expected_hasher.finalize()))\n        );\n    }\n\n    #[test]\n    fn can_handle_long_paths() {\n        assert_eq!(\n            Md5Hash::try_from(Path::new(\"a/b/c/d/e/f/g/saver/foo/bar.png\")),\n            Md5Hash::try_from(Path::new(\"saver/foo/bar.png\")),\n        );\n    }\n\n    #[test]\n    fn from_invalid_paths() {\n   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This module contains two functions whose sole purpose is to allow a single\n//! producer multiple consumer (SPMC) system using the filesystem as an\n//! intermediate.\n//!\n//! Consider the scenario where two clients, A and B, request the same uncached\n//! file, one after the other. In a typical caching system, both requests would\n//! result in a cache miss, and both requests would then be proxied from\n//! upstream. But, we can do better. We know that by the time one request\n//! begins, there should be a file on disk for us to read from. Why require\n//! subsequent requests to read from upstream, when we can simply fetch one and\n//! read from the filesystem that we know will have the exact same data?\n//! Instead, we can just read from the filesystem and just inform all readers\n//! when the file is done. This is beneficial to both downstream and upstream as\n//! upstream no longer needs to process duplicate requests and sequential cache\n//! misses are treated as closer as a cache hit.\n\nuse std::error::Error;\nuse std::fmt::Display;\nuse std::io::{Seek, SeekFrom};\nuse std::path::Path;\nuse std::pin::Pin;\nuse std::task::{Context, Poll};\n\nuse actix_web::error::PayloadError;\nuse bytes::Bytes;\nuse futures::Future;\nuse log::{debug, warn};\nuse serde::{Deserialize, Serialize};\nuse sodiumoxide::crypto::secretstream::{\n    Header, Pull, Push, Stream as SecretStream, Tag, HEADERBYTES,\n};\nuse tokio::fs::{create_dir_all, remove_file, File};\nuse tokio::io::{AsyncRead, AsyncReadExt, AsyncSeekExt, AsyncWrite, AsyncWriteExt, ReadBuf};\nuse tokio::sync::mpsc::Sender;\nuse tokio_util::codec::{BytesCodec, FramedRead};\n\nuse super::compat::LegacyImageMetadata;\nuse super::{CacheKey, ImageMetadata, InnerStream, ENCRYPTION_KEY};\n\n#[derive(Serialize, Deserialize)]\npub enum OnDiskMetadata {\n    Encrypted(Header, ImageMetadata),\n    Plaintext(ImageMetadata),\n}\n\n/// Attempts to lookup the file on disk, returning a byte stream if it exists.\n/// Note that this could return two types of streams, depending on if the file\n/// is in progress of being written to.\n#[inline]\npub(super) async fn read_file_from_path(\n    path: \u0026Path,\n) -\u003e Option\u003cResult\u003c(InnerStream, Option\u003cHeader\u003e, ImageMetadata), std::io::Error\u003e\u003e {\n    read_file(std::fs::File::open(path).ok()?).await\n}\n\nasync fn read_file(\n    file: std::fs::File,\n) -\u003e Option\u003cResult\u003c(InnerStream, Option\u003cHeader\u003e, ImageMetadata), std::io::Error\u003e\u003e {\n    let mut file_0 = file.try_clone().unwrap();\n    let file_1 = file.try_clone().unwrap();\n\n    // Try reading decrypted header first...\n    let mut deserializer = serde_json::Deserializer::from_reader(file);\n    let mut maybe_metadata = ImageMetadata::deserialize(\u0026mut deserializer);\n\n    // Failed to parse normally, see if we have a legacy file format\n    if maybe_metadata.is_err() {\n        file_0.seek(SeekFrom::Start(2)).ok()?;\n        let mut deserializer = serde_json::Deserializer::from_reader(file_0);\n        maybe_metadata =\n            LegacyImageMetadata::deserialize(\u0026mut deserializer).map(LegacyImageMetadata::into);\n    }\n\n    let parsed_metadata;\n    let mut maybe_header = None;\n    let mut reader: Option\u003cPin\u003cBox\u003cdyn AsyncRead + Send\u003e\u003e\u003e = None;\n    if let Ok(metadata) = maybe_metadata {\n        // image is decrypted\n        if ENCRYPTION_KEY.get().is_some() {\n            // invalidate cache since we're running in at-rest encryption and\n            // the file wasn't encrypted.\n            warn!(\"Found file but was not encrypted!\");\n            return None;\n        }\n\n        reader = Some(Box::pin(File::from_std(file_1)));\n        parsed_metadata = Some(metadata);\n        debug!(\"Found not encrypted file\");\n    } else {\n        let mut file = File::from_std(file_1);\n        file.seek(SeekFrom::Start(0)).await.ok()?;\n        let file_0 = file.try_clone().await.unwrap();\n\n        // image is encrypted or corrupt\n\n        // If the encryption key was set, use the encrypted disk reader instead;\n        // else, just directly read from file.\n        if let Some(key) = ENCRYPTION_KEY.get() {\n            let mut header_bytes = [0; HEADERBYTES];\n            if let Err(e) = file.read_exact(\u0026mut header_bytes).await {\n                warn!(\"Found file but failed reading header: {}\", e);\n                return None;\n            }\n\n            let file_header = if let Some(header) = Header::from_slice(\u0026header_bytes) {\n                header\n            } else {\n                warn!(\"Found file, but encrypted header was invalid. Assuming corrupted!\");\n                return None;\n            };\n\n            let secret_stream = if let Ok(stream) = SecretStream::init_pull(\u0026file_header, key) {\n                stream\n            } else {\n                warn!(\"Failed to init secret stream with key and header. Assuming corrupted!\");\n                return None;\n            };\n\n            maybe_header = Some(file_header);\n\n            reader = Some(Box::pin(EncryptedDiskReader::new(file, secret_stream)));\n        }\n\n        let mut deserializer = serde_json::Deserializer::from_reader(file_0.into_std().await);\n        parsed_metadata = ImageMetadata::deserialize(\u0026mut deserializer).ok();\n\n        if parsed_metadata.is_some() {\n            debug!(\"Found encrypted file\");\n        }\n    }\n\n    // parsed_metadata is either set or unset here. If it's set then we\n    // successfully decoded the data; otherwise the file is garbage.\n\n    if let Some(reader) = reader {\n        let stream = InnerStream::Completed(FramedRead::new(reader, BytesCodec::new()));\n        parsed_metadata.map(|metadata| Ok((stream, maybe_header, metadata)))\n    } else {\n        debug!(\"Reader was invalid, file is corrupt\");\n        None\n    }\n}\n\nstruct EncryptedDiskReader {\n    file: Pin\u003cBox\u003cFile\u003e\u003e,\n    stream: SecretStream\u003cPull\u003e,\n    buf: Vec\u003cu8\u003e,\n}\n\nimpl EncryptedDiskReader {\n    fn new(file: File, stream: SecretStream\u003cPull\u003e) -\u003e Self {\n        Self {\n            file: Box::pin(file),\n            stream,\n            buf: vec![],\n        }\n    }\n}\n\nimpl AsyncRead for EncryptedDiskReader {\n    fn poll_read(\n        mut self: Pin\u003c\u0026mut Self\u003e,\n        cx: \u0026mut Context\u003c'_\u003e,\n        buf: \u0026mut ReadBuf\u003c'_\u003e,\n    ) -\u003e Poll\u003cstd::io::Result\u003c()\u003e\u003e {\n        let cursor_start = buf.filled().len();\n\n        let res = self.as_mut().file.as_mut().poll_read(cx, buf);\n        if res.is_pending() {\n            return Poll::Pending;\n        }\n\n        let cursor_new = buf.filled().len();\n\n        // pull_to_vec internally calls vec.clear() and vec.reserve(). Generally\n        // speaking we should be reading about the same amount of data each time\n        // so we shouldn't experience too much of a slow down w.r.t resizing the\n        // buffer...\n        let new_self = Pin::into_inner(self);\n        new_self\n            .stream\n            .pull_to_vec(\n                \u0026buf.filled()[cursor_start..cursor_new],\n                None,\n                \u0026mut new_self.buf,\n            )\n            .unwrap();\n\n        // data is strictly smaller than the encrypted stream, since you need to\n        // encode tags as well, so this is always safe.\n\n        // rewrite encrypted data into decrypted data\n        let buffer = buf.filled_mut();\n        for (old, new) in buffer[cursor_start..].iter_mut().zip(\u0026new_self.buf) {\n            *old = *new;\n        }\n        buf.set_filled(cursor_start + new_self.buf.len());\n\n        res\n    }\n}\n\n/// Writes the metadata and input stream (in that order) to a file, returning a\n/// stream that reads from that file. Accepts a db callback function that is\n/// provided the number of bytes written, and an optional on-complete callback\n/// that is called with a completed cache entry.\npub(super) async fn write_file\u003cFut, DbCallback\u003e(\n    path: \u0026Path,\n    cache_key: CacheKey,\n    bytes: Bytes,\n    metadata: ImageMetadata,\n    db_callback: DbCallback,\n    on_complete: Option\u003cSender\u003c(CacheKey, Bytes, ImageMetadata, u64)\u003e\u003e,\n) -\u003e Result\u003c(), std::io::Error\u003e\nwhere\n    Fut: 'static + Send + Sync + Future\u003cOutput = ()\u003e,\n    DbCallback: 'static + Send + Sync + FnOnce(u64) -\u003e Fut,\n{\n    let file = {\n        let parent = path.parent().expect(\"The path to have a parent\");\n        create_dir_all(parent).await?;\n        let file = File::create(path).await?; // we need to make sure the file exists and is truncated.\n        file\n    };\n\n    let metadata_string = serde_json::to_string(\u0026metadata).expect(\"serialization to work\");\n    let metadata_size = metadata_string.len();\n\n    let (mut writer, maybe_header): (Pin\u003cBox\u003cdyn AsyncWrite + Send\u003e\u003e, _) =\n        if let Some((enc, header)) = ENCRYPTION_KEY\n            .get()\n            .map(|key| SecretStream::init_push(key).expect(\"Failed to init enc stream\"))\n        {\n            (Box::pin(EncryptedDiskWriter::new(file, enc)), Some(header))\n        } else {\n            (Box::pin(file), None)\n        };\n\n    let mut error = if let Some(header) = maybe_header {\n        writer.write_all(header.as_ref()).await.err()\n    } else {\n        None\n    };\n\n    if error.is_none() {\n        error = writer.write_all(metadata_string.as_bytes()).await.err();\n    }\n    if error.is_none() {\n        error = writer.write_all(\u0026bytes).await.err();\n    }\n\n    if let Some(e) = error {\n        // It's ok if the deleting the file fails, since we truncate on\n        // create anyways, but it should be best effort.\n        //\n        // We don't care about the result of the call.\n        std::mem::drop(remove_file(path).await);\n        return Err(e);\n    }\n\n    writer.flush().await?;\n    debug!(\"writing to file done\");\n\n    let bytes_written = (metadata_size + bytes.len()) as u64;\n    tokio::spawn(db_callback(bytes_written));\n\n    if let Some(sender) = on_complete {\n        tokio::spawn(async move {\n            sender\n                .send((cache_key, bytes, metadata, bytes_written))\n                .await\n        });\n    }\n\n    Ok(())\n}\n\nstruct EncryptedDiskWriter {\n    file: Pin\u003cBox\u003cFile\u003e\u003e,\n    stream: Option\u003cSecretStream\u003cPush\u003e\u003e,\n    encryption_buffer: Vec\u003cu8\u003e,\n    write_buffer: Vec\u003cu8\u003e,\n}\n\nimpl EncryptedDiskWriter {\n    fn new(file: File, stream: SecretStream\u003cPush\u003e) -\u003e Self {\n        Self {\n            file: Box::pin(file),\n            stream: Some(stream),\n            encryption_buffer: vec![],\n            write_buffer: vec![],\n        }\n    }\n}\n\nimpl AsyncWrite for EncryptedDiskWriter {\n    fn poll_write(\n        self: Pin\u003c\u0026mut Self\u003e,\n        cx: \u0026mut Context\u003c'_\u003e,\n        buf: \u0026[u8],\n    ) -\u003e Poll\u003cResult\u003cusize, std::io::Error\u003e\u003e {\n        let new_self = Pin::into_inner(self);\n        {\n            let encryption_buffer = \u0026mut new_self.encryption_buffer;\n            if let Some(stream) = new_self.stream.as_mut() {\n                stream\n                    .push_to_vec(buf, None, Tag::Message, encryption_buffer)\n                    .expect(\"Failed to write encrypted data to buffer\");\n            }\n        }\n\n        new_self.write_buffer.extend(\u0026new_self.encryption_buffer);\n\n        match new_self\n            .file\n            .as_mut()\n            .poll_write(cx, \u0026new_self.write_buffer)\n        {\n            Poll::Ready(Ok(n)) =\u003e {\n                new_self.write_buffer.drain(..n);\n                // We buffered all the bytes that were provided to use.\n                Poll::Ready(Ok(buf.len()))\n            }\n            poll =\u003e poll,\n        }\n    }\n\n    fn poll_flush(\n        mut self: Pin\u003c\u0026mut Self\u003e,\n        cx: \u0026mut Context\u003c'_\u003e,\n    ) -\u003e Poll\u003cResult\u003c(), std::io::Error\u003e\u003e {\n        if self.as_ref().write_buffer.is_empty() {\n            self.file.as_mut().poll_flush(cx)\n        } else {\n            let new_self = Pin::into_inner(self);\n            let buffer = new_self.write_buffer.as_ref();\n            match new_self.file.as_mut().poll_write(cx, buffer) {\n                Poll::Ready(res) =\u003e {\n                    let n = res?;\n                    new_self.write_buffer.drain(..n);\n                    // We're immediately ready to do some more flushing!\n                    cx.waker().wake_by_ref();\n                    // Return pending here because we still need to flush the\n                    // file\n                    Poll::Pending\n                }\n                Poll::Pending =\u003e Poll::Pending,\n            }\n        }\n    }\n\n    fn poll_shutdown(\n        mut self: Pin\u003c\u0026mut Self\u003e,\n        cx: \u0026mut Context\u003c'_\u003e,\n    ) -\u003e Poll\u003cResult\u003c(), std::io::Error\u003e\u003e {\n        self.as_mut()\n            .stream\n            .take()\n            .map(|stream| stream.finalize(None));\n        self.file.as_mut().poll_shutdown(cx)\n    }\n}\n\n/// Represents some upstream error.\n#[derive(Debug, PartialEq, Eq)]\npub struct UpstreamError;\n\nimpl Error for UpstreamError {}\n\nimpl Display for UpstreamError {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        write!(f, \"An upstream error occurred\")\n    }\n}\n\nimpl From\u003cUpstreamError\u003e for actix_web::Error {\n    #[inline]\n    fn from(_: UpstreamError) -\u003e Self {\n        PayloadError::Incomplete(None).into()\n    }\n}\n\n#[cfg(test)]\nmod read_file {\n    use crate::cache::{ImageContentType, ImageMetadata};\n\n    use super::read_file;\n    use bytes::Bytes;\n    use chrono::DateTime;\n    use futures::StreamExt;\n    use std::io::{Seek, SeekFrom, Write};\n    use tempfile::tempfile;\n\n    #[tokio::test]\n    async fn can_read() {\n        let mut temp_file = tempfile().unwrap();\n        temp_file\n            .write_all(\n                br#\"{\"content_type\":0,\"content_length\":708370,\"last_modified\":\"2021-04-13T04:37:41+00:00\"}abc\"#,\n            )\n            .unwrap();\n        temp_file.seek(SeekFrom::Start(0)).unwrap();\n\n        let (inner_stream, maybe_header, metadata) = read_file(temp_file).await.unwrap().unwrap();\n\n        let foo: Vec\u003c_\u003e = inner_stream.collect().await;\n        assert_eq!(foo, vec![Ok(Bytes::from(\"abc\"))]);\n        assert!(maybe_header.is_none());\n        assert_eq!(\n            metadata,\n            ImageMetadata {\n                content_length: Some(708_370),\n                content_type: Some(ImageContentType::Png),\n                last_modified: Some(\n                    DateTime::parse_from_rfc3339(\"2021-04-13T04:37:41+00:00\").unwrap()\n                )\n            }\n        );\n    }\n}\n\n#[cfg(test)]\nmod read_file_compat {\n    use crate::cache::{ImageContentType, ImageMetadata};\n\n    use super::read_file;\n    use bytes::Bytes;\n    use chrono::DateTime;\n    use futures::StreamExt;\n    use std::io::{Seek, SeekFrom, Write};\n    use tempfile::tempfile;\n\n    #[tokio::test]\n    async fn can_read_legacy() {\n        let mut temp_file = tempfile().unwrap();\n        temp_file\n            .write_all(\n                b\"\\x00\\x5b{\\\"content_type\\\":\\\"image/jpeg\\\",\\\"last_modified\\\":\\\"Sat, 10 Apr 2021 10:55:22 GMT\\\",\\\"size\\\":117888}abc\",\n            )\n            .unwrap();\n        temp_file.seek(SeekFrom::Start(0)).unwrap();\n\n        let (inner_stream, maybe_header, metadata) = read_file(temp_file).await.unwrap().unwrap();\n\n        let foo: Vec\u003c_\u003e = inner_stream.collect().await;\n        assert_eq!(foo, vec![Ok(Bytes::from(\"abc\"))]);\n        assert!(maybe_header.is_none());\n        assert_eq!(\n            metadata,\n            ImageMetadata {\n                content_length: Some(117_888),\n                content_type: Some(ImageContentType::Jpeg),\n                last_modified: Some(\n                    DateTime::parse_from_rfc2822(\"Sat, 10 Apr 2021 10:55:22 GMT\").unwrap()\n                )\n            }\n        );\n    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std::sync::atomic::{AtomicU64, Ordering};\nuse std::sync::Arc;\n\nuse super::{\n    Cache, CacheError, CacheKey, CacheStream, CallbackCache, ImageMetadata, InnerStream, MemStream,\n};\nuse async_trait::async_trait;\nuse bytes::Bytes;\nuse futures::FutureExt;\nuse lfu_cache::LfuCache;\nuse lru::LruCache;\nuse tokio::sync::mpsc::{channel, Sender};\nuse tokio::sync::Mutex;\n\ntype CacheValue = (Bytes, ImageMetadata, u64);\n\n/// Use LRU as the eviction strategy\npub type Lru = LruCache\u003cCacheKey, CacheValue\u003e;\n/// Use LFU as the eviction strategy\npub type Lfu = LfuCache\u003cCacheKey, CacheValue\u003e;\n\n/// Adapter trait for memory cache backends\npub trait InternalMemoryCache: Sync + Send {\n    fn unbounded() -\u003e Self;\n    fn get(\u0026mut self, key: \u0026CacheKey) -\u003e Option\u003c\u0026CacheValue\u003e;\n    fn push(\u0026mut self, key: CacheKey, data: CacheValue);\n    fn pop(\u0026mut self) -\u003e Option\u003c(CacheKey, CacheValue)\u003e;\n}\n\nimpl InternalMemoryCache for Lfu {\n    #[inline]\n    fn unbounded() -\u003e Self {\n        Self::unbounded()\n    }\n\n    #[inline]\n    fn get(\u0026mut self, key: \u0026CacheKey) -\u003e Option\u003c\u0026CacheValue\u003e {\n        self.get(key)\n    }\n\n    #[inline]\n    fn push(\u0026mut self, key: CacheKey, data: CacheValue) {\n        self.insert(key, data);\n    }\n\n    #[inline]\n    fn pop(\u0026mut self) -\u003e Option\u003c(CacheKey, CacheValue)\u003e {\n        self.pop_lfu_key_value()\n    }\n}\n\nimpl InternalMemoryCache for Lru {\n    #[inline]\n    fn unbounded() -\u003e Self {\n        Self::unbounded()\n    }\n\n    #[inline]\n    fn get(\u0026mut self, key: \u0026CacheKey) -\u003e Option\u003c\u0026CacheValue\u003e {\n        self.get(key)\n    }\n\n    #[inline]\n    fn push(\u0026mut self, key: CacheKey, data: CacheValue) {\n        self.put(key, data);\n    }\n\n    #[inline]\n    fn pop(\u0026mut self) -\u003e Option\u003c(CacheKey, CacheValue)\u003e {\n        self.pop_lru()\n    }\n}\n\n/// Memory accelerated disk cache. Uses the internal cache implementation in\n/// memory to speed up reads.\npub struct MemoryCache\u003cMemoryCacheImpl, ColdCache\u003e {\n    inner: ColdCache,\n    cur_mem_size: AtomicU64,\n    mem_cache: Mutex\u003cMemoryCacheImpl\u003e,\n    master_sender: Sender\u003c(CacheKey, Bytes, ImageMetadata, u64)\u003e,\n}\n\nimpl\u003cMemoryCacheImpl, ColdCache\u003e MemoryCache\u003cMemoryCacheImpl, ColdCache\u003e\nwhere\n    MemoryCacheImpl: 'static + InternalMemoryCache,\n    ColdCache: 'static + Cache,\n{\n    pub async fn new(inner: ColdCache, max_mem_size: crate::units::Bytes) -\u003e Arc\u003cSelf\u003e {\n        let (tx, mut rx) = channel(100);\n        let new_self = Arc::new(Self {\n            inner,\n            cur_mem_size: AtomicU64::new(0),\n            mem_cache: Mutex::new(MemoryCacheImpl::unbounded()),\n            master_sender: tx,\n        });\n\n        let new_self_0 = Arc::clone(\u0026new_self);\n        tokio::spawn(async move {\n            let new_self = new_self_0;\n            let max_mem_size = max_mem_size.get() / 20 * 19;\n            while let Some((key, bytes, metadata, size)) = rx.recv().await {\n                // Add to memory cache\n                // We can add first because we constrain our memory usage to 95%\n                new_self\n                    .cur_mem_size\n                    .fetch_add(size as u64, Ordering::Release);\n                new_self\n                    .mem_cache\n                    .lock()\n                    .await\n                    .push(key, (bytes, metadata, size));\n\n                // Pop if too large\n                while new_self.cur_mem_size.load(Ordering::Acquire) \u003e= max_mem_size as u64 {\n                    let popped = new_self\n                        .mem_cache\n                        .lock()\n                        .await\n                        .pop()\n                        .map(|(key, (bytes, metadata, size))| (key, bytes, metadata, size));\n                    if let Some((_, _, _, size)) = popped {\n                        new_self\n                            .cur_mem_size\n                            .fetch_sub(size as u64, Ordering::Release);\n                    } else {\n                        break;\n                    }\n                }\n            }\n        });\n\n        new_self\n    }\n}\n\n#[async_trait]\nimpl\u003cMemoryCacheImpl, ColdCache\u003e Cache for MemoryCache\u003cMemoryCacheImpl, ColdCache\u003e\nwhere\n    MemoryCacheImpl: InternalMemoryCache,\n    ColdCache: CallbackCache,\n{\n    #[inline]\n    async fn get(\n        \u0026self,\n        key: \u0026CacheKey,\n    ) -\u003e Option\u003cResult\u003c(CacheStream, ImageMetadata), super::CacheError\u003e\u003e {\n        match self.mem_cache.lock().now_or_never() {\n            Some(mut mem_cache) =\u003e match mem_cache.get(key).map(|(bytes, metadata, _)| {\n                Ok((InnerStream::Memory(MemStream(bytes.clone())), *metadata))\n            }) {\n                Some(v) =\u003e Some(v.and_then(|(inner, metadata)| {\n                    CacheStream::new(inner, None)\n                        .map(|v| (v, metadata))\n                        .map_err(|_| CacheError::DecryptionFailure)\n                })),\n                None =\u003e self.inner.get(key).await,\n            },\n            None =\u003e self.inner.get(key).await,\n        }\n    }\n\n    #[inline]\n    async fn put(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n    ) -\u003e Result\u003c(), super::CacheError\u003e {\n        self.inner\n            .put_with_on_completed_callback(key, image, metadata, self.master_sender.clone())\n            .await\n    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Serialize_repr};\nuse sodiumoxide::crypto::secretstream::{Header, Key, Pull, Stream as SecretStream};\nuse thiserror::Error;\nuse tokio::io::AsyncRead;\nuse tokio::sync::mpsc::Sender;\nuse tokio_util::codec::{BytesCodec, FramedRead};\n\npub use disk::DiskCache;\npub use fs::UpstreamError;\npub use mem::MemoryCache;\n\nuse self::compat::LegacyImageMetadata;\n\npub static ENCRYPTION_KEY: OnceCell\u003cKey\u003e = OnceCell::new();\n\nmod compat;\nmod disk;\nmod fs;\npub mod mem;\n\n#[derive(PartialEq, Eq, Hash, Clone)]\npub struct CacheKey(pub String, pub String, pub bool);\n\nimpl Display for CacheKey {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        if self.2 {\n            write!(f, \"saver/{}/{}\", self.0, self.1)\n        } else {\n            write!(f, \"data/{}/{}\", self.0, self.1)\n        }\n    }\n}\n\nimpl From\u003cCacheKey\u003e for PathBuf {\n    #[inline]\n    fn from(key: CacheKey) -\u003e Self {\n        key.to_string().into()\n    }\n}\n\nimpl From\u003c\u0026CacheKey\u003e for PathBuf {\n    #[inline]\n    fn from(key: \u0026CacheKey) -\u003e Self {\n        key.to_string().into()\n    }\n}\n\n#[derive(Clone)]\npub struct CachedImage(pub Bytes);\n\n#[derive(Copy, Clone, Serialize, Deserialize, Debug, PartialEq)]\npub struct ImageMetadata {\n    pub content_type: Option\u003cImageContentType\u003e,\n    pub content_length: Option\u003cu32\u003e,\n    pub last_modified: Option\u003cDateTime\u003cFixedOffset\u003e\u003e,\n}\n\n// Confirmed by Ply to be these types: https://link.eddie.sh/ZXfk0\n#[derive(Copy, Clone, Serialize_repr, Deserialize_repr, Debug, PartialEq, Eq)]\n#[repr(u8)]\npub enum ImageContentType {\n    Png = 0,\n    Jpeg,\n    Gif,\n}\n\npub struct InvalidContentType;\n\nimpl FromStr for ImageContentType {\n    type Err = InvalidContentType;\n\n    #[inline]\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        match s {\n            \"image/png\" =\u003e Ok(Self::Png),\n            \"image/jpeg\" =\u003e Ok(Self::Jpeg),\n            \"image/gif\" =\u003e Ok(Self::Gif),\n            _ =\u003e Err(InvalidContentType),\n        }\n    }\n}\n\nimpl AsRef\u003cstr\u003e for ImageContentType {\n    #[inline]\n    fn as_ref(\u0026self) -\u003e \u0026str {\n        match self {\n            Self::Png =\u003e \"image/png\",\n            Self::Jpeg =\u003e \"image/jpeg\",\n            Self::Gif =\u003e \"image/gif\",\n        }\n    }\n}\n\nimpl From\u003cLegacyImageMetadata\u003e for ImageMetadata {\n    fn from(legacy: LegacyImageMetadata) -\u003e Self {\n        Self {\n            content_type: legacy.content_type.map(|v| v.0),\n            content_length: legacy.size,\n            last_modified: legacy.last_modified.map(|v| v.0),\n        }\n    }\n}\n\n#[derive(Debug)]\npub enum ImageRequestError {\n    ContentType,\n    ContentLength,\n    LastModified,\n}\n\nimpl ImageMetadata {\n    pub fn new(\n        content_type: Option\u003cHeaderValue\u003e,\n        content_length: Option\u003cHeaderValue\u003e,\n        last_modified: Option\u003cHeaderValue\u003e,\n    ) -\u003e Result\u003cSelf, ImageRequestError\u003e {\n        Ok(Self {\n            content_type: content_type\n                .map(|v| match v.to_str() {\n                    Ok(v) =\u003e ImageContentType::from_str(v),\n                    Err(_) =\u003e Err(InvalidContentType),\n                })\n                .transpose()\n                .map_err(|_| ImageRequestError::ContentType)?,\n            content_length: content_length\n                .map(|header_val| {\n                    header_val\n                        .to_str()\n                        .map_err(|_| ImageRequestError::ContentLength)?\n                        .parse()\n                        .map_err(|_| ImageRequestError::ContentLength)\n                })\n                .transpose()?,\n            last_modified: last_modified\n                .map(|header_val| {\n                    DateTime::parse_from_rfc2822(\n                        header_val\n                            .to_str()\n                            .map_err(|_| ImageRequestError::LastModified)?,\n                    )\n                    .map_err(|_| ImageRequestError::LastModified)\n                })\n                .transpose()?,\n        })\n    }\n}\n\n#[derive(Error, Debug)]\npub enum CacheError {\n    #[error(transparent)]\n    Io(#[from] std::io::Error),\n    #[error(transparent)]\n    Reqwest(#[from] reqwest::Error),\n    #[error(transparent)]\n    Upstream(#[from] UpstreamError),\n    #[error(\"An error occurred while reading the decryption header\")]\n    DecryptionFailure,\n}\n\n#[async_trait]\npub trait Cache: Send + Sync {\n    async fn get(\u0026self, key: \u0026CacheKey)\n        -\u003e Option\u003cResult\u003c(CacheStream, ImageMetadata), CacheError\u003e\u003e;\n\n    async fn put(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n    ) -\u003e Result\u003c(), CacheError\u003e;\n}\n\n#[async_trait]\nimpl\u003cT: Cache\u003e Cache for Arc\u003cT\u003e {\n    #[inline]\n    async fn get(\n        \u0026self,\n        key: \u0026CacheKey,\n    ) -\u003e Option\u003cResult\u003c(CacheStream, ImageMetadata), CacheError\u003e\u003e {\n        self.as_ref().get(key).await\n    }\n\n    #[inline]\n    async fn put(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n    ) -\u003e Result\u003c(), CacheError\u003e {\n        self.as_ref().put(key, image, metadata).await\n    }\n}\n\n#[async_trait]\npub trait CallbackCache: Cache {\n    async fn put_with_on_completed_callback(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n        on_complete: Sender\u003c(CacheKey, Bytes, ImageMetadata, u64)\u003e,\n    ) -\u003e Result\u003c(), CacheError\u003e;\n}\n\n#[async_trait]\nimpl\u003cT: CallbackCache\u003e CallbackCache for Arc\u003cT\u003e {\n    #[inline]\n    async fn put_with_on_completed_callback(\n        \u0026self,\n        key: CacheKey,\n        image: Bytes,\n        metadata: ImageMetadata,\n        on_complete: Sender\u003c(CacheKey, Bytes, ImageMetadata, u64)\u003e,\n    ) -\u003e Result\u003c(), CacheError\u003e {\n        self.as_ref()\n            .put_with_on_completed_callback(key, image, metadata, on_complete)\n            .await\n    }\n}\n\npub struct CacheStream {\n    inner: InnerStream,\n    decrypt: Option\u003cSecretStream\u003cPull\u003e\u003e,\n}\n\nimpl CacheStream {\n    pub(self) fn new(inner: InnerStream, header: Option\u003cHeader\u003e) -\u003e Result\u003cSelf, ()\u003e {\n        Ok(Self {\n            inner,\n            decrypt: header\n                .and_then(|header| {\n                    ENCRYPTION_KEY\n                        .get()\n                        .map(|key| SecretStream::init_pull(\u0026header, key))\n                })\n                .transpose()?,\n        })\n    }\n}\n\nimpl Stream for CacheStream {\n    type Item = CacheStreamItem;\n\n    fn poll_next(mut self: Pin\u003c\u0026mut Self\u003e, cx: \u0026mut Context\u003c'_\u003e) -\u003e Poll\u003cOption\u003cSelf::Item\u003e\u003e {\n        self.inner.poll_next_unpin(cx).map(|data| {\n            // False positive (`data`): https://link.eddie.sh/r1fXX\n            #[allow(clippy::option_if_let_else)]\n            if let Some(keystream) = self.decrypt.as_mut() {\n                data.map(|bytes_res| {\n                    bytes_res.and_then(|bytes| {\n                        keystream\n                            .pull(\u0026bytes, None)\n                            .map(|(data, _tag)| Bytes::from(data))\n                            .map_err(|_| UpstreamError)\n                    })\n                })\n            } else {\n                data\n            }\n        })\n    }\n}\n\npub(self) enum InnerStream {\n    Memory(MemStream),\n    Completed(FramedRead\u003cPin\u003cBox\u003cdyn AsyncRead + Send\u003e\u003e, BytesCodec\u003e),\n}\n\nimpl From\u003cCachedImage\u003e for InnerStream {\n    fn from(image: CachedImage) -\u003e Self {\n        Self::Memory(MemStream(image.0))\n    }\n}\n\ntype CacheStreamItem = Result\u003cBytes, UpstreamError\u003e;\n\nimpl Stream for InnerStream {\n    type Item = CacheStreamItem;\n\n    fn poll_next(self: Pin\u003c\u0026mut Self\u003e, cx: \u0026mut Context\u003c'_\u003e) -\u003e Poll\u003cOption\u003cSelf::Item\u003e\u003e {\n        match self.get_mut() {\n            Self::Memory(stream) =\u003e stream.poll_next_unpin(cx),\n            Self::Completed(stream) =\u003e stream\n                .poll_next_unpin(cx)\n                .map_ok(BytesMut::freeze)\n                .map_err(|_| UpstreamError),\n        }\n    }\n}\n\npub struct MemStream(pub Bytes);\n\nimpl Stream for MemStream {\n    type Item = CacheStreamItem;\n\n    fn poll_next(mut self: Pin\u003c\u0026mut Self\u003e, _: \u0026mut Context\u003c'_\u003e) -\u003e Poll\u003cOption\u003cSelf::Item\u003e\u003e {\n        let mut new_bytes = Bytes::new();\n        std::mem::swap(\u0026mut self.0, \u0026mut new_bytes);\n        if new_bytes.is_empty() {\n            Poll::Ready(None)\n        } else {\n            Poll::Ready(Some(Ok(new_bytes)))\n        }\n    }\n}\n\n#[cfg(test)]\nmod tests {\n    use super::*;\n\n    #[test]\n    fn metadata_size() {\n        assert_eq!(std::mem::size_of::\u003cImageMetadata\u003e(), 32);\n    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std::collections::HashMap;\nuse std::sync::Arc;\nuse std::time::Duration;\n\nuse actix_web::http::{HeaderMap, HeaderName, HeaderValue};\nuse actix_web::web::Data;\nuse bytes::Bytes;\nuse log::{debug, error, warn};\nuse once_cell::sync::Lazy;\nuse parking_lot::RwLock;\nuse reqwest::header::{\n    ACCESS_CONTROL_ALLOW_ORIGIN, ACCESS_CONTROL_EXPOSE_HEADERS, CACHE_CONTROL, CONTENT_LENGTH,\n    CONTENT_TYPE, LAST_MODIFIED, X_CONTENT_TYPE_OPTIONS,\n};\nuse reqwest::{Client, StatusCode};\nuse tokio::sync::watch::{channel, Receiver};\nuse tokio::sync::Notify;\n\nuse crate::cache::{Cache, CacheKey, ImageMetadata};\n\npub static HTTP_CLIENT: Lazy\u003cCachingClient\u003e = Lazy::new(|| CachingClient {\n    inner: Client::builder()\n        .pool_idle_timeout(Duration::from_secs(180))\n        .https_only(true)\n        .http2_prior_knowledge()\n        .build()\n        .expect(\"Client initialization to work\"),\n    locks: RwLock::new(HashMap::new()),\n});\n\npub static DEFAULT_HEADERS: Lazy\u003cHeaderMap\u003e = Lazy::new(|| {\n    let mut headers = HeaderMap::with_capacity(8);\n    headers.insert(X_CONTENT_TYPE_OPTIONS, HeaderValue::from_static(\"nosniff\"));\n    headers.insert(\n        ACCESS_CONTROL_ALLOW_ORIGIN,\n        HeaderValue::from_static(\"https://mangadex.org\"),\n    );\n    headers.insert(ACCESS_CONTROL_EXPOSE_HEADERS, HeaderValue::from_static(\"*\"));\n    headers.insert(\n        CACHE_CONTROL,\n        HeaderValue::from_static(\"public, max-age=1209600\"),\n    );\n    headers.insert(\n        HeaderName::from_static(\"timing-allow-origin\"),\n        HeaderValue::from_static(\"https://mangadex.org\"),\n    );\n    headers\n});\n\npub struct CachingClient {\n    inner: Client,\n    locks: RwLock\u003cHashMap\u003cString, Receiver\u003cFetchResult\u003e\u003e\u003e,\n}\n\n#[derive(Clone, Debug)]\npub enum FetchResult {\n    ServiceUnavailable,\n    InternalServerError,\n    Data(StatusCode, HeaderMap, Bytes),\n    Processing,\n}\n\nimpl CachingClient {\n    pub async fn fetch_and_cache(\n        \u0026'static self,\n        url: String,\n        key: CacheKey,\n        cache: Data\u003cdyn Cache\u003e,\n    ) -\u003e FetchResult {\n        if let Some(recv) = self.locks.read().get(\u0026url) {\n            let mut recv = recv.clone();\n            loop {\n                if !matches!(*recv.borrow(), FetchResult::Processing) {\n                    break;\n                }\n                if recv.changed().await.is_err() {\n                    break;\n                }\n            }\n\n            return recv.borrow().clone();\n        }\n        let url_0 = url.clone();\n\n        let notify = Arc::new(Notify::new());\n        let notify2 = Arc::clone(\u0026notify);\n\n        tokio::spawn(async move {\n            let (tx, rx) = channel(FetchResult::Processing);\n\n            self.locks.write().insert(url.clone(), rx);\n            notify.notify_one();\n            let resp = self.inner.get(\u0026url).send().await;\n\n            let resp = match resp {\n                Ok(mut resp) =\u003e {\n                    let content_type = resp.headers().get(CONTENT_TYPE);\n\n                    let is_image = content_type\n                        .map(|v| String::from_utf8_lossy(v.as_ref()).contains(\"image/\"))\n                        .unwrap_or_default();\n\n                    if resp.status() != StatusCode::OK || !is_image {\n                        warn!(\"Got non-OK or non-image response code from upstream, proxying and not caching result.\");\n\n                        let mut headers = DEFAULT_HEADERS.clone();\n\n                        if let Some(content_type) = content_type {\n                            headers.insert(CONTENT_TYPE, content_type.clone());\n                        }\n\n                        FetchResult::Data(\n                            resp.status(),\n                            headers,\n                            resp.bytes().await.unwrap_or_default(),\n                        )\n                    } else {\n                        let (content_type, length, last_mod) = {\n                            let headers = resp.headers_mut();\n                            (\n                                headers.remove(CONTENT_TYPE),\n                                headers.remove(CONTENT_LENGTH),\n                                headers.remove(LAST_MODIFIED),\n                            )\n                        };\n\n                        let body = resp.bytes().await.unwrap();\n\n                        debug!(\"Inserting into cache\");\n\n                        let metadata = ImageMetadata::new(\n                            content_type.clone(),\n                            length.clone(),\n                            last_mod.clone(),\n                        )\n                        .unwrap();\n\n                        match cache.put(key, body.clone(), metadata).await {\n                            Ok(()) =\u003e {\n                                debug!(\"Done putting into cache\");\n\n                                let mut headers = DEFAULT_HEADERS.clone();\n                                if let Some(content_type) = content_type {\n                                    headers.insert(CONTENT_TYPE, content_type);\n                                }\n\n                                if let Some(content_length) = length {\n                                    headers.insert(CONTENT_LENGTH, content_length);\n                                }\n\n                                if let Some(last_modified) = last_mod {\n                                    headers.insert(LAST_MODIFIED, last_modified);\n                                }\n\n                                FetchResult::Data(StatusCode::OK, headers, body)\n                            }\n                            Err(e) =\u003e {\n                                warn!(\"Failed to insert into cache: {}\", e);\n                                FetchResult::InternalServerError\n                            }\n                        }\n                    }\n                }\n                Err(e) =\u003e {\n                    error!(\"Failed to fetch image from server: {}\", e);\n                    FetchResult::ServiceUnavailable\n                }\n            };\n            // This shouldn't happen\n            tx.send(resp).unwrap();\n            self.locks.write().remove(\u0026url);\n        });\n\n        notify2.notified().await;\n\n        let mut recv = self.locks.read().get(\u0026url_0).unwrap().clone();\n        loop {\n            if !matches!(*recv.borrow(), FetchResult::Processing) {\n                break;\n            }\n            if recv.changed().await.is_err() {\n                break;\n            }\n        }\n        let resp = recv.borrow().clone();\n        resp\n    }\n\n    #[inline]\n    pub const fn inner(\u0026self) -\u003e \u0026Client {\n        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std::fmt::{Display, Formatter};\nuse std::fs::{File, OpenOptions};\nuse std::hint::unreachable_unchecked;\nuse std::io::{ErrorKind, Write};\nuse std::net::{IpAddr, Ipv4Addr, SocketAddr};\nuse std::num::NonZeroU16;\nuse std::path::{Path, PathBuf};\nuse std::str::FromStr;\nuse std::sync::atomic::{AtomicBool, Ordering};\n\nuse clap::{crate_authors, crate_description, crate_version, Clap};\nuse log::LevelFilter;\nuse serde::{Deserialize, Serialize};\nuse thiserror::Error;\nuse url::Url;\n\nuse crate::units::{KilobitsPerSecond, Mebibytes, Port};\n\n// Validate tokens is an atomic because it's faster than locking on rwlock.\npub static VALIDATE_TOKENS: AtomicBool = AtomicBool::new(false);\npub static OFFLINE_MODE: AtomicBool = AtomicBool::new(false);\n\n#[derive(Error, Debug)]\npub enum ConfigError {\n    #[error(\"No config found. One has been created for you to modify.\")]\n    NotInitialized,\n    #[error(transparent)]\n    Io(#[from] std::io::Error),\n    #[error(transparent)]\n    Parse(#[from] serde_yaml::Error),\n}\n\npub fn load_config() -\u003e Result\u003cConfig, ConfigError\u003e {\n    // Load cli args first\n    let cli_args: CliArgs = CliArgs::parse();\n\n    // Load yaml file next\n    let config_file: Result\u003cYamlArgs, _\u003e = {\n        let config_path = cli_args\n            .config_path\n            .as_deref()\n            .unwrap_or_else(|| Path::new(\"./settings.yaml\"));\n        match File::open(config_path) {\n            Ok(file) =\u003e serde_yaml::from_reader(file),\n            Err(e) if e.kind() == ErrorKind::NotFound =\u003e {\n                let mut file = OpenOptions::new()\n                    .write(true)\n                    .create_new(true)\n                    .open(config_path)\n                    .unwrap();\n\n                let default_config = include_str!(\"../settings.sample.yaml\");\n                file.write_all(default_config.as_bytes()).unwrap();\n\n                return Err(ConfigError::NotInitialized);\n            }\n            Err(e) =\u003e return Err(e.into()),\n        }\n    };\n\n    // generate config\n    let config = Config::from_cli_and_file(cli_args, config_file?);\n\n    // initialize globals\n    OFFLINE_MODE.store(\n        config\n            .unstable_options\n            .contains(\u0026UnstableOptions::OfflineMode),\n        Ordering::Release,\n    );\n\n    Ok(config)\n}\n\n#[derive(Debug)]\n/// Represents a fully parsed config, from a variety of sources.\npub struct Config {\n    pub cache_type: CacheType,\n    pub cache_path: PathBuf,\n    pub shutdown_timeout: NonZeroU16,\n    pub log_level: LevelFilter,\n    pub client_secret: ClientSecret,\n    pub port: Port,\n    pub bind_address: SocketAddr,\n    pub external_address: Option\u003cSocketAddr\u003e,\n    pub ephemeral_disk_encryption: bool,\n    pub network_speed: KilobitsPerSecond,\n    pub disk_quota: Mebibytes,\n    pub memory_quota: Mebibytes,\n    pub unstable_options: Vec\u003cUnstableOptions\u003e,\n    pub override_upstream: Option\u003cUrl\u003e,\n    pub enable_metrics: bool,\n}\n\nimpl Config {\n    fn from_cli_and_file(cli_args: CliArgs, file_args: YamlArgs) -\u003e Self {\n        let file_extended_options = file_args.extended_options.unwrap_or_default();\n\n        let log_level = match (cli_args.quiet, cli_args.verbose) {\n            (n, _) if n \u003e 2 =\u003e LevelFilter::Off,\n            (2, _) =\u003e LevelFilter::Error,\n            (1, _) =\u003e LevelFilter::Warn,\n            // Use log level from file if no flags were provided to CLI\n            (0, 0) =\u003e file_extended_options\n                .logging_level\n                .unwrap_or(LevelFilter::Info),\n            (_, 1) =\u003e LevelFilter::Debug,\n            (_, n) if n \u003e 1 =\u003e LevelFilter::Trace,\n            // compiler can't figure it out\n            _ =\u003e unsafe { unreachable_unchecked() },\n        };\n\n        let bind_port = cli_args\n            .port\n            .unwrap_or(file_args.server_settings.port)\n            .get();\n\n        // This needs to be outside because rust isn't smart enough yet to\n        // realize a disjointed borrow of a moved value is ok. This will be\n        // fixed in Rust 2021.\n        let external_port = file_args\n            .server_settings\n            .external_port\n            .map_or(bind_port, Port::get);\n\n        Self {\n            cache_type: cli_args\n                .cache_type\n                .or(file_extended_options.cache_type)\n                .unwrap_or_default(),\n            cache_path: cli_args\n                .cache_path\n                .or(file_extended_options.cache_path)\n                .unwrap_or_else(|| PathBuf::from_str(\"./cache\").unwrap()),\n            shutdown_timeout: file_args\n                .server_settings\n                .graceful_shutdown_wait_seconds\n                .unwrap_or(unsafe { NonZeroU16::new_unchecked(60) }),\n            log_level,\n            // secret should never be in CLI\n            client_secret: if let Ok(v) = std::env::var(\"CLIENT_SECRET\") {\n                ClientSecret(v)\n            } else {\n                file_args.server_settings.secret\n            },\n            port: cli_args.port.unwrap_or(file_args.server_settings.port),\n            bind_address: SocketAddr::new(\n                file_args\n                    .server_settings\n                    .hostname\n                    .unwrap_or_else(|| IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0))),\n                bind_port,\n            ),\n            external_address: file_args\n                .server_settings\n                .external_ip\n                .map(|ip_addr| SocketAddr::new(ip_addr, external_port)),\n            ephemeral_disk_encryption: cli_args.ephemeral_disk_encryption\n                || file_extended_options\n                    .ephemeral_disk_encryption\n                    .unwrap_or_default(),\n            network_speed: cli_args\n                .network_speed\n                .unwrap_or(file_args.server_settings.external_max_kilobits_per_second),\n            disk_quota: cli_args\n                .disk_quota\n                .unwrap_or(file_args.max_cache_size_in_mebibytes),\n            memory_quota: cli_args\n                .memory_quota\n                .or(file_extended_options.memory_quota)\n                .unwrap_or_default(),\n            enable_metrics: file_extended_options.enable_metrics.unwrap_or_default(),\n\n            // Unstable options (and related) should never be in yaml config\n            unstable_options: cli_args.unstable_options,\n            override_upstream: cli_args.override_upstream,\n        }\n    }\n}\n\n// this intentionally does not implement display\n#[derive(Deserialize, Serialize, Clone)]\npub struct ClientSecret(String);\n\nimpl std::fmt::Debug for ClientSecret {\n    fn fmt(\u0026self, f: \u0026mut Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        write!(f, \"[client secret]\")\n    }\n}\n\n#[derive(Deserialize, Copy, Clone, Debug)]\n#[serde(rename_all = \"snake_case\")]\npub enum CacheType {\n    OnDisk,\n    Lru,\n    Lfu,\n}\n\nimpl FromStr for CacheType {\n    type Err = String;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        match s {\n            \"on_disk\" =\u003e Ok(Self::OnDisk),\n            \"lru\" =\u003e Ok(Self::Lru),\n            \"lfu\" =\u003e Ok(Self::Lfu),\n            _ =\u003e Err(format!(\"Unknown option: {}\", s)),\n        }\n    }\n}\n\nimpl Default for CacheType {\n    fn default() -\u003e Self {\n        Self::OnDisk\n    }\n}\n\n#[derive(Deserialize)]\nstruct YamlArgs {\n    // Naming is legacy\n    max_cache_size_in_mebibytes: Mebibytes,\n    server_settings: YamlServerSettings,\n    // This implementation custom options\n    extended_options: Option\u003cYamlExtendedOptions\u003e,\n}\n\n// Naming is legacy\n#[derive(Deserialize)]\nstruct YamlServerSettings {\n    secret: ClientSecret,\n    #[serde(default)]\n    port: Port,\n    external_max_kilobits_per_second: KilobitsPerSecond,\n    external_port: Option\u003cPort\u003e,\n    graceful_shutdown_wait_seconds: Option\u003cNonZeroU16\u003e,\n    hostname: Option\u003cIpAddr\u003e,\n    external_ip: Option\u003cIpAddr\u003e,\n}\n\n#[derive(Deserialize, Default)]\nstruct YamlExtendedOptions {\n    memory_quota: Option\u003cMebibytes\u003e,\n    cache_type: Option\u003cCacheType\u003e,\n    ephemeral_disk_encryption: Option\u003cbool\u003e,\n    enable_metrics: Option\u003cbool\u003e,\n    logging_level: Option\u003cLevelFilter\u003e,\n    cache_path: Option\u003cPathBuf\u003e,\n}\n\n#[derive(Clap, Clone)]\n#[clap(version = crate_version!(), author = crate_authors!(), about = crate_description!())]\nstruct CliArgs {\n    /// The port to listen on.\n    #[clap(short, long)]\n    pub port: Option\u003cPort\u003e,\n    /// How large, in mebibytes, the in-memory cache should be. Note that this\n    /// does not include runtime memory usage.\n    #[clap(long)]\n    pub memory_quota: Option\u003cMebibytes\u003e,\n    /// How large, in mebibytes, the on-disk cache should be. Note that actual\n    /// values may be larger for metadata information.\n    #[clap(long)]\n    pub disk_quota: Option\u003cMebibytes\u003e,\n    /// Sets the location of the disk cache.\n    #[clap(long)]\n    pub cache_path: Option\u003cPathBuf\u003e,\n    /// The network speed to advertise to Mangadex@Home control server.\n    #[clap(long)]\n    pub network_speed: Option\u003cKilobitsPerSecond\u003e,\n    /// Changes verbosity. Default verbosity is INFO, while increasing counts of\n    /// verbose flags increases the verbosity to DEBUG and TRACE, respectively.\n    #[clap(short, long, parse(from_occurrences), conflicts_with = \"quiet\")]\n    pub verbose: usize,\n    /// Changes verbosity. Default verbosity is INFO, while increasing counts of\n    /// quiet flags decreases the verbosity to WARN, ERROR, and no logs,\n    /// respectively.\n    #[clap(short, long, parse(from_occurrences), conflicts_with = \"verbose\")]\n    pub quiet: usize,\n    #[clap(short = 'Z', long)]\n    pub unstable_options: Vec\u003cUnstableOptions\u003e,\n    #[clap(long)]\n    pub override_upstream: Option\u003cUrl\u003e,\n    /// Enables ephemeral disk encryption. Items written to disk are first\n    /// encrypted with a key generated at runtime. There are implications to\n    /// performance, privacy, and usability with this flag enabled.\n    #[clap(short, long)]\n    pub ephemeral_disk_encryption: bool,\n    #[clap(short, long)]\n    pub config_path: Option\u003cPathBuf\u003e,\n    #[clap(short = 't', long)]\n    pub cache_type: Option\u003cCacheType\u003e,\n}\n\n#[derive(Clone, Copy, Debug, PartialEq, Eq)]\npub enum UnstableOptions {\n    /// Overrides the upstream URL to fetch images from. Don't use this unless\n    /// you know what you're dealing with.\n    OverrideUpstream,\n\n    /// Disables token validation. Don't use this unless you know the\n    /// ramifications of this command.\n    DisableTokenValidation,\n\n    /// Tries to run without communication to MangaDex.\n    OfflineMode,\n\n    /// Serves HTTP in plaintext\n    DisableTls,\n}\n\nimpl FromStr for UnstableOptions {\n    type Err = String;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        match s {\n            \"override-upstream\" =\u003e Ok(Self::OverrideUpstream),\n            \"disable-token-validation\" =\u003e Ok(Self::DisableTokenValidation),\n            \"offline-mode\" =\u003e Ok(Self::OfflineMode),\n            \"disable-tls\" =\u003e Ok(Self::DisableTls),\n            _ =\u003e Err(format!(\"Unknown unstable option '{}'\", s)),\n        }\n    }\n}\n\nimpl Display for UnstableOptions {\n    fn fmt(\u0026self, f: \u0026mut Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        match self {\n            Self::OverrideUpstream =\u003e write!(f, \"override-upstream\"),\n            Self::DisableTokenValidation =\u003e write!(f, \"disable-token-validation\"),\n            Self::OfflineMode =\u003e write!(f, \"offline-mode\"),\n            Self::DisableTls =\u003e write!(f, \"disable-tls\"),\n        }\n    }\n}\n\n#[cfg(test)]\nmod sample_yaml {\n    use crate::config::YamlArgs;\n\n    #[test]\n    fn sample_yaml_parses() {\n        assert!(serde_yaml::from_str::\u003cYamlArgs\u003e(include_str!(\"../settings.sample.yaml\")).is_ok());\n    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clippy::nursery)]\n// We're end users, so these is ok\n#![allow(clippy::module_name_repetitions)]\n\nuse std::env::VarError;\nuse std::error::Error;\nuse std::fmt::Display;\nuse std::num::ParseIntError;\nuse std::sync::atomic::{AtomicBool, Ordering};\nuse std::sync::Arc;\nuse std::time::Duration;\n\nuse actix_web::rt::{spawn, time, System};\nuse actix_web::web::{self, Data};\nuse actix_web::{App, HttpResponse, HttpServer};\nuse cache::{Cache, DiskCache};\nuse config::Config;\nuse log::{debug, error, info, warn};\nuse parking_lot::RwLock;\nuse rustls::{NoClientAuth, ServerConfig};\nuse simple_logger::SimpleLogger;\nuse sodiumoxide::crypto::secretstream::gen_key;\nuse state::{RwLockServerState, ServerState};\nuse stop::send_stop;\nuse thiserror::Error;\n\nuse crate::cache::mem::{Lfu, Lru};\nuse crate::cache::{MemoryCache, ENCRYPTION_KEY};\nuse crate::config::{CacheType, UnstableOptions, OFFLINE_MODE};\nuse crate::state::DynamicServerCert;\n\nmod cache;\nmod client;\nmod config;\nmod metrics;\nmod ping;\nmod routes;\nmod state;\nmod stop;\nmod units;\n\nconst CLIENT_API_VERSION: usize = 31;\n\n#[derive(Error, Debug)]\nenum ServerError {\n    #[error(\"There was a failure parsing config\")]\n    Config(#[from] VarError),\n    #[error(\"Failed to parse an int\")]\n    ParseInt(#[from] ParseIntError),\n}\n\n#[actix_web::main]\nasync fn main() -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n    sodiumoxide::init().expect(\"Failed to initialize crypto\");\n    // It's ok to fail early here, it would imply we have a invalid config.\n    dotenv::dotenv().ok();\n\n    //\n    // Config loading\n    //\n\n    let config = match config::load_config() {\n        Ok(c) =\u003e c,\n        Err(e) =\u003e {\n            eprintln!(\"{}\", e);\n            return Err(Box::new(e) as Box\u003c_\u003e);\n        }\n    };\n\n    let memory_quota = config.memory_quota;\n    let disk_quota = config.disk_quota;\n    let cache_type = config.cache_type;\n    let cache_path = config.cache_path.clone();\n    let disable_tls = config\n        .unstable_options\n        .contains(\u0026UnstableOptions::DisableTls);\n    let bind_address = config.bind_address;\n\n    //\n    // Logging and warnings\n    //\n\n    SimpleLogger::new().with_level(config.log_level).init()?;\n\n    if let Err(e) = print_preamble_and_warnings(\u0026config) {\n        error!(\"{}\", e);\n        return Err(e);\n    }\n\n    debug!(\"{:?}\", \u0026config);\n\n    let client_secret = config.client_secret.clone();\n    let client_secret_1 = config.client_secret.clone();\n\n    if config.ephemeral_disk_encryption {\n        info!(\"Running with at-rest encryption!\");\n        ENCRYPTION_KEY.set(gen_key()).unwrap();\n    }\n\n    if config.enable_metrics {\n        metrics::init();\n    }\n\n    // HTTP Server init\n\n    let server = if OFFLINE_MODE.load(Ordering::Acquire) {\n        ServerState::init_offline()\n    } else {\n        ServerState::init(\u0026client_secret, \u0026config).await?\n    };\n    let data_0 = Arc::new(RwLockServerState(RwLock::new(server)));\n    let data_1 = Arc::clone(\u0026data_0);\n\n    //\n    // At this point, the server is ready to start, and starts the necessary\n    // threads.\n    //\n\n    // Set ctrl+c to send a stop message\n    let running = Arc::new(AtomicBool::new(true));\n    let running_1 = running.clone();\n    let system = System::current();\n    ctrlc::set_handler(move || {\n        let system = \u0026system;\n        let client_secret = client_secret.clone();\n        let running_2 = Arc::clone(\u0026running_1);\n        if !OFFLINE_MODE.load(Ordering::Acquire) {\n            System::new().block_on(async move {\n                if running_2.load(Ordering::SeqCst) {\n                    send_stop(\u0026client_secret).await;\n                } else {\n                    warn!(\"Got second Ctrl-C, forcefully exiting\");\n                    system.stop();\n                }\n            });\n        }\n        running_1.store(false, Ordering::SeqCst);\n    })\n    .expect(\"Error setting Ctrl-C handler\");\n\n    // Spawn ping task\n    if !OFFLINE_MODE.load(Ordering::Acquire) {\n        spawn(async move {\n            let mut interval = time::interval(Duration::from_secs(90));\n            let mut data = Arc::clone(\u0026data_0);\n            loop {\n                interval.tick().await;\n                debug!(\"Sending ping!\");\n                ping::update_server_state(\u0026client_secret_1, \u0026config, \u0026mut data).await;\n            }\n        });\n    }\n\n    let memory_max_size = memory_quota.into();\n    let cache = DiskCache::new(disk_quota.into(), cache_path.clone()).await;\n    let cache: Arc\u003cdyn Cache\u003e = match cache_type {\n        CacheType::OnDisk =\u003e cache,\n        CacheType::Lru =\u003e MemoryCache::\u003cLfu, _\u003e::new(cache, memory_max_size).await,\n        CacheType::Lfu =\u003e MemoryCache::\u003cLru, _\u003e::new(cache, memory_max_size).await,\n    };\n\n    let cache_0 = Arc::clone(\u0026cache);\n\n    // Start HTTPS server\n    let server = HttpServer::new(move || {\n        App::new()\n            .service(routes::index)\n            .service(routes::token_data)\n            .service(routes::token_data_saver)\n            .service(routes::metrics)\n            .route(\n                \"/data/{tail:.*}\",\n                web::get().to(HttpResponse::UnavailableForLegalReasons),\n            )\n            .route(\n                \"/data-saver/{tail:.*}\",\n                web::get().to(HttpResponse::UnavailableForLegalReasons),\n            )\n            .route(\"{tail:.*}\", web::get().to(routes::default))\n            .app_data(Data::from(Arc::clone(\u0026data_1)))\n            .app_data(Data::from(Arc::clone(\u0026cache_0)))\n    })\n    .shutdown_timeout(60);\n\n    if disable_tls {\n        server.bind(bind_address)?.run().await?;\n    } else {\n        // Rustls only supports TLS 1.2 and 1.3.\n        let tls_config = {\n            let mut tls_config = ServerConfig::new(NoClientAuth::new());\n            tls_config.cert_resolver = Arc::new(DynamicServerCert);\n            tls_config\n        };\n\n        server.bind_rustls(bind_address, tls_config)?.run().await?;\n    }\n\n    // Waiting for us to finish sending stop message\n    while running.load(Ordering::SeqCst) {\n        std::thread::sleep(Duration::from_millis(250));\n    }\n\n    Ok(())\n}\n\n#[derive(Debug)]\nenum InvalidCombination {\n    MissingUnstableOption(\u0026'static str, UnstableOptions),\n}\n\nimpl Display for InvalidCombination {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        match self {\n            InvalidCombination::MissingUnstableOption(opt, arg) =\u003e {\n                write!(\n                    f,\n                    \"The option '{}' requires the unstable option '-Z {}'\",\n                    opt, arg\n                )\n            }\n        }\n    }\n}\n\nimpl Error for InvalidCombination {}\n\nfn print_preamble_and_warnings(args: \u0026Config) -\u003e Result\u003c(), Box\u003cdyn Error\u003e\u003e {\n    println!(concat!(\n        env!(\"CARGO_PKG_NAME\"),\n        \" \",\n        env!(\"CARGO_PKG_VERSION\"),\n        \" (\",\n        env!(\"VERGEN_GIT_SHA_SHORT\"),\n        \")\",\n        \"  Copyright (C) 2021  \",\n        env!(\"CARGO_PKG_AUTHORS\"),\n        \"\\n\\n\",\n        env!(\"CARGO_PKG_NAME\"),\n        \" is free software: you can redistribute it and/or modify\\n\\\n        it under the terms of the GNU General Public License as published by\\n\\\n        the Free Software Foundation, either version 3 of the License, or\\n\\\n        (at your option) any later version.\\n\\n\",\n        env!(\"CARGO_PKG_NAME\"),\n        \" is distributed in the hope that it will be useful,\\n\\\n        but WITHOUT ANY WARRANTY; without even the implied warranty of\\n\\\n        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\\n\\\n        GNU General Public License for more details.\\n\\n\\\n        You should have received a copy of the GNU General Public License\\n\\\n        along with \",\n        env!(\"CARGO_PKG_NAME\"),\n        \". If not, see \u003chttps://www.gnu.org/licenses/\u003e.\\n\"\n    ));\n\n    if args.ephemeral_disk_encryption {\n        error!(\"Encrypted files are _very_ broken; caveat emptor!\");\n    }\n\n    if !args.unstable_options.is_empty() {\n        warn!(\"Unstable options are enabled. These options should not be used in production!\");\n    }\n\n    if args\n        .unstable_options\n        .contains(\u0026UnstableOptions::OfflineMode)\n    {\n        warn!(\"Running in offline mode. No communication to MangaDex will be made!\");\n    }\n\n    if args.unstable_options.contains(\u0026UnstableOptions::DisableTls) {\n        warn!(\"Serving insecure traffic! You better be running this for development only.\");\n    }\n\n    if args.override_upstream.is_some()\n        \u0026\u0026 !args\n            .unstable_options\n            .contains(\u0026UnstableOptions::OverrideUpstream)\n    {\n        Err(Box::new(InvalidCombination::MissingUnstableOption(\n            \"override-upstream\",\n            UnstableOptions::OverrideUpstream,\n        )))\n    } else {\n        Ok(())\n    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once_cell::sync::Lazy;\nuse prometheus::{register_int_counter, IntCounter};\n\nmacro_rules! init_counters {\n    ($(($counter:ident, $ty:ty, $name:literal, $desc:literal),)*) =\u003e {\n        $(\n            pub static $counter: Lazy\u003c$ty\u003e = Lazy::new(|| {\n                register_int_counter!($name, $desc).unwrap()\n            });\n        )*\n\n        #[allow(clippy::shadow_unrelated)]\n        pub fn init() {\n            $(let _a = $counter.get();)*\n        }\n    };\n}\n\ninit_counters!(\n    (\n        CACHE_HIT_COUNTER,\n        IntCounter,\n        \"cache_hit\",\n        \"The number of cache hits.\"\n    ),\n    (\n        CACHE_MISS_COUNTER,\n        IntCounter,\n        \"cache_miss\",\n        \"The number of cache misses.\"\n    ),\n    (\n        REQUESTS_TOTAL_COUNTER,\n        IntCounter,\n        \"requests_total\",\n        \"The total number of requests served.\"\n    ),\n    (\n        REQUESTS_DATA_COUNTER,\n        IntCounter,\n        \"requests_data\",\n        \"The number of requests served from the /data endpoint.\"\n    ),\n    (\n        REQUESTS_DATA_SAVER_COUNTER,\n        IntCounter,\n        \"requests_data_saver\",\n        \"The number of requests served from the /data-saver endpoint.\"\n    ),\n    (\n        REQUESTS_OTHER_COUNTER,\n        IntCounter,\n        \"requests_other\",\n        \"The total number of request not served by primary endpoints.\"\n    ),\n);\n","traces":[{"line":7,"address":[5162080,5161948,5160256,5161340,5162688,5160864,5162556,5163296,5163164,5163772,5160732,5161472],"length":1,"stats":{"Line":0},"fn_name":"{{closure}}"},{"line":8,"address":[5162438,5161963,5162095,5161487,5161222,5160271,5163179,5160747,5163046,5163654,5160614,5161355,5162703,5161830,5160879,5162571,5163787,5163311],"length":1,"stats":{"Line":0},"fn_name":null},{"line":13,"address":[5163888],"length":1,"stats":{"Line":0},"fn_name":"init"},{"line":14,"address":[5163892],"length":1,"stats":{"Line":0},"fn_name":null}],"covered":0,"coverable":4},{"path":["/","home","edward","Documents","repos","mangadex-home","src","ping.rs"],"content":"use std::sync::atomic::Ordering;\nuse std::{io::BufReader, sync::Arc};\n\nuse log::{debug, error, info, warn};\nuse rustls::internal::pemfile::{certs, rsa_private_keys};\nuse rustls::sign::{RSASigningKey, SigningKey};\nuse rustls::Certificate;\nuse serde::de::{MapAccess, Visitor};\nuse serde::{Deserialize, Serialize};\nuse serde_repr::Deserialize_repr;\nuse sodiumoxide::crypto::box_::PrecomputedKey;\nuse url::Url;\n\nuse crate::config::{ClientSecret, Config, UnstableOptions, VALIDATE_TOKENS};\nuse crate::state::{\n    RwLockServerState, PREVIOUSLY_COMPROMISED, PREVIOUSLY_PAUSED, TLS_CERTS,\n    TLS_PREVIOUSLY_CREATED, TLS_SIGNING_KEY,\n};\nuse crate::units::{BytesPerSecond, Mebibytes, Port};\nuse crate::CLIENT_API_VERSION;\n\npub const CONTROL_CENTER_PING_URL: \u0026str = \"https://api.mangadex.network/ping\";\n\n#[derive(Serialize)]\npub struct Request\u003c'a\u003e {\n    secret: \u0026'a ClientSecret,\n    port: Port,\n    disk_space: Mebibytes,\n    network_speed: BytesPerSecond,\n    build_version: usize,\n    tls_created_at: Option\u003cString\u003e,\n}\n\nimpl\u003c'a\u003e Request\u003c'a\u003e {\n    fn from_config_and_state(secret: \u0026'a ClientSecret, config: \u0026Config) -\u003e Self {\n        Self {\n            secret,\n            port: config.port,\n            disk_space: config.disk_quota,\n            network_speed: config.network_speed.into(),\n            build_version: CLIENT_API_VERSION,\n            tls_created_at: TLS_PREVIOUSLY_CREATED\n                .get()\n                .map(|v| v.load().as_ref().clone()),\n        }\n    }\n}\n\nimpl\u003c'a\u003e From\u003c(\u0026'a ClientSecret, \u0026Config)\u003e for Request\u003c'a\u003e {\n    fn from((secret, config): (\u0026'a ClientSecret, \u0026Config)) -\u003e Self {\n        Self {\n            secret,\n            port: config.port,\n            disk_space: config.disk_quota,\n            network_speed: config.network_speed.into(),\n            build_version: CLIENT_API_VERSION,\n            tls_created_at: None,\n        }\n    }\n}\n\n#[derive(Deserialize, Debug)]\n#[serde(untagged)]\npub enum Response {\n    Ok(OkResponse),\n    Error(ErrorResponse),\n}\n\n#[derive(Deserialize, Debug)]\npub struct OkResponse {\n    pub image_server: Url,\n    pub latest_build: usize,\n    pub url: Url,\n    pub token_key: Option\u003cString\u003e,\n    pub compromised: bool,\n    pub paused: bool,\n    #[serde(default)]\n    pub force_tokens: bool,\n    pub tls: Option\u003cTls\u003e,\n}\n\n#[derive(Deserialize, Debug)]\npub struct ErrorResponse {\n    pub error: String,\n    pub status: ErrorCode,\n}\n\n#[derive(Deserialize_repr, Debug, Copy, Clone)]\n#[repr(u16)]\npub enum ErrorCode {\n    MalformedJson = 400,\n    InvalidSecret = 401,\n    InvalidContentType = 415,\n}\n\npub struct Tls {\n    pub created_at: String,\n    pub priv_key: Arc\u003cBox\u003cdyn SigningKey\u003e\u003e,\n    pub certs: Vec\u003cCertificate\u003e,\n}\n\nimpl\u003c'de\u003e Deserialize\u003c'de\u003e for Tls {\n    fn deserialize\u003cD\u003e(deserializer: D) -\u003e Result\u003cSelf, D::Error\u003e\n    where\n        D: serde::Deserializer\u003c'de\u003e,\n    {\n        struct TlsVisitor;\n\n        impl\u003c'de\u003e Visitor\u003c'de\u003e for TlsVisitor {\n            type Value = Tls;\n\n            fn expecting(\u0026self, formatter: \u0026mut std::fmt::Formatter) -\u003e std::fmt::Result {\n                formatter.write_str(\"a tls struct\")\n            }\n\n            fn visit_map\u003cA\u003e(self, mut map: A) -\u003e Result\u003cSelf::Value, A::Error\u003e\n            where\n                A: MapAccess\u003c'de\u003e,\n            {\n                let mut created_at = None;\n                let mut priv_key = None;\n                let mut certificates = None;\n\n                while let Some((key, value)) = map.next_entry::\u003c\u0026str, String\u003e()? {\n                    match key {\n                        \"created_at\" =\u003e created_at = Some(value.to_string()),\n                        \"private_key\" =\u003e {\n                            priv_key = rsa_private_keys(\u0026mut BufReader::new(value.as_bytes()))\n                                .ok()\n                                .and_then(|mut v| {\n                                    v.pop().and_then(|key| RSASigningKey::new(\u0026key).ok())\n                                });\n                        }\n                        \"certificate\" =\u003e {\n                            certificates = certs(\u0026mut BufReader::new(value.as_bytes())).ok();\n                        }\n                        _ =\u003e (), // Ignore extra fields\n                    }\n                }\n\n                match (created_at, priv_key, certificates) {\n                    (Some(created_at), Some(priv_key), Some(certificates)) =\u003e Ok(Tls {\n                        created_at,\n                        priv_key: Arc::new(Box::new(priv_key)),\n                        certs: certificates,\n                    }),\n                    _ =\u003e Err(serde::de::Error::custom(\"Could not deserialize tls info\")),\n                }\n            }\n        }\n\n        deserializer.deserialize_map(TlsVisitor)\n    }\n}\n\nimpl std::fmt::Debug for Tls {\n    fn fmt(\u0026self, f: \u0026mut std::fmt::Formatter\u003c'_\u003e) -\u003e std::fmt::Result {\n        f.debug_struct(\"Tls\")\n            .field(\"created_at\", \u0026self.created_at)\n            .finish()\n    }\n}\n\npub async fn update_server_state(\n    secret: \u0026ClientSecret,\n    cli: \u0026Config,\n    data: \u0026mut Arc\u003cRwLockServerState\u003e,\n) {\n    let req = Request::from_config_and_state(secret, cli);\n    let client = reqwest::Client::new();\n    let resp = client.post(CONTROL_CENTER_PING_URL).json(\u0026req).send().await;\n    match resp {\n        Ok(resp) =\u003e match resp.json::\u003cResponse\u003e().await {\n            Ok(Response::Ok(resp)) =\u003e {\n                debug!(\"got write guard for server state\");\n                let mut write_guard = data.0.write();\n\n                let image_server_changed = write_guard.image_server != resp.image_server;\n                if !write_guard.url_overridden \u0026\u0026 image_server_changed {\n                    write_guard.image_server = resp.image_server;\n                } else if image_server_changed {\n                    warn!(\"Ignoring new upstream url!\");\n                }\n\n                if let Some(key) = resp.token_key {\n                    if let Some(key) = base64::decode(\u0026key)\n                        .ok()\n                        .and_then(|k| PrecomputedKey::from_slice(\u0026k))\n                    {\n                        write_guard.precomputed_key = key;\n                    } else {\n                        error!(\"Failed to parse token key: got {}\", key);\n                    }\n                }\n\n                if !cli\n                    .unstable_options\n                    .contains(\u0026UnstableOptions::DisableTokenValidation)\n                    \u0026\u0026 VALIDATE_TOKENS.load(Ordering::Acquire) != resp.force_tokens\n                {\n                    if resp.force_tokens {\n                        info!(\"Client received command to enforce token validity.\");\n                    } else {\n                        info!(\"Client received command to no longer enforce token validity\");\n                    }\n                    VALIDATE_TOKENS.store(resp.force_tokens, Ordering::Release);\n                }\n\n                if let Some(tls) = resp.tls {\n                    TLS_PREVIOUSLY_CREATED\n                        .get()\n                        .unwrap()\n                        .swap(Arc::new(tls.created_at));\n                    TLS_SIGNING_KEY.get().unwrap().swap(tls.priv_key);\n                    TLS_CERTS.get().unwrap().swap(Arc::new(tls.certs));\n                }\n\n                let previously_compromised = PREVIOUSLY_COMPROMISED.load(Ordering::Acquire);\n                if resp.compromised != previously_compromised {\n                    PREVIOUSLY_COMPROMISED.store(resp.compromised, Ordering::Release);\n                    if resp.compromised {\n                        error!(\"Got compromised response from control center!\");\n                    } else if previously_compromised {\n                        info!(\"No longer compromised!\");\n                    }\n                }\n\n                let previously_paused = PREVIOUSLY_PAUSED.load(Ordering::Acquire);\n                if resp.paused != previously_paused {\n                    PREVIOUSLY_PAUSED.store(resp.paused, Ordering::Release);\n                    if resp.paused {\n                        warn!(\"Control center has paused this node.\");\n                    } else {\n                        info!(\"Control center is no longer pausing this node.\");\n                    }\n                }\n\n                if resp.url != write_guard.url {\n                    info!(\"This client's URL has been updated to {}\", resp.url);\n                }\n\n                debug!(\"dropping write guard for server state\");\n            }\n            Ok(Response::Error(resp)) =\u003e {\n                error!(\n                    \"Got an {} error from upstream: {}\",\n                    resp.status as u16, resp.error\n                );\n            }\n            Err(e) =\u003e warn!(\"Got malformed response: {}\", e),\n        },\n        Err(e) =\u003e match e {\n            e if e.is_timeout() =\u003e {\n                error!(\"Response timed out to control server. Is MangaDex down?\");\n            }\n            e =\u003e warn!(\"Failed to send request: {}\", e),\n        },\n    }\n}\n","traces":[{"line":35,"address":[5142816],"length":1,"stats":{"Line":0},"fn_name":"from_config_and_state"},{"line":38,"address":[5142845],"length":1,"stats":{"Line":0},"fn_name":null},{"line":39,"address":[5142857],"length":1,"stats":{"Line":0},"fn_name":null},{"line":40,"address":[5142866],"length":1,"stats":{"Line":0},"fn_name":null},{"line":42,"address":[5142880],"length":1,"stats":{"Line":0},"fn_name":null},{"line":50,"address":[5143184,5143212],"length":1,"stats":{"Line":0},"fn_name":"from"},{"line":53,"address":[5143225],"length":1,"stats":{"Line":0},"fn_name":null},{"line":54,"address":[5143237],"length":1,"stats":{"Line":0},"fn_name":null},{"line":55,"address":[5143246],"length":1,"stats":{"Line":0},"fn_name":null},{"line":103,"address":[5143360],"length":1,"stats":{"Line":0},"fn_name":"deserialize\u003cserde::__private::de::content::ContentRefDeserializer\u003cserde_json::error::Error\u003e\u003e"},{"line":109,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":110,"address":[],"length":0,"stats":{"Line":0},"fn_name":null},{"line":112,"address":[5143392],"length":1,"stats":{"Line":0},"fn_name":"expecting"},{"line":113,"address":[5143419],"length":1,"stats":{"Line":0},"fn_name":null},{"line":116,"address":[5143456,5145125],"length":1,"stats":{"Line":0},"fn_name":"visit_map\u003c\u0026mut 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std::sync::atomic::Ordering;\n\nuse actix_web::error::ErrorNotFound;\nuse actix_web::http::header::{CONTENT_LENGTH, CONTENT_TYPE, LAST_MODIFIED};\nuse actix_web::http::HeaderValue;\nuse actix_web::web::Path;\nuse actix_web::HttpResponseBuilder;\nuse actix_web::{get, web::Data, HttpRequest, HttpResponse, Responder};\nuse base64::DecodeError;\nuse bytes::Bytes;\nuse chrono::{DateTime, Utc};\nuse futures::Stream;\nuse log::{debug, error, info, trace};\nuse prometheus::{Encoder, TextEncoder};\nuse serde::Deserialize;\nuse sodiumoxide::crypto::box_::{open_precomputed, Nonce, PrecomputedKey, NONCEBYTES};\nuse thiserror::Error;\n\nuse crate::cache::{Cache, CacheKey, ImageMetadata, UpstreamError};\nuse crate::client::{FetchResult, DEFAULT_HEADERS, HTTP_CLIENT};\nuse crate::config::{OFFLINE_MODE, VALIDATE_TOKENS};\nuse crate::metrics::{\n    CACHE_HIT_COUNTER, CACHE_MISS_COUNTER, REQUESTS_DATA_COUNTER, REQUESTS_DATA_SAVER_COUNTER,\n    REQUESTS_OTHER_COUNTER, REQUESTS_TOTAL_COUNTER,\n};\nuse crate::state::RwLockServerState;\n\nconst BASE64_CONFIG: base64::Config = base64::Config::new(base64::CharacterSet::UrlSafe, false);\n\npub enum ServerResponse {\n    TokenValidationError(TokenValidationError),\n    HttpResponse(HttpResponse),\n}\n\nimpl Responder for ServerResponse {\n    #[inline]\n    fn respond_to(self, req: \u0026HttpRequest) -\u003e HttpResponse {\n        match self {\n            Self::TokenValidationError(e) =\u003e e.respond_to(req),\n            Self::HttpResponse(resp) =\u003e {\n                REQUESTS_TOTAL_COUNTER.inc();\n                resp.respond_to(req)\n            }\n        }\n    }\n}\n\n#[allow(clippy::unused_async)]\n#[get(\"/\")]\nasync fn index() -\u003e impl Responder {\n    HttpResponse::Ok().body(include_str!(\"index.html\"))\n}\n\n#[allow(clippy::future_not_send)]\n#[get(\"/{token}/data/{chapter_hash}/{file_name}\")]\nasync fn token_data(\n    state: Data\u003cRwLockServerState\u003e,\n    cache: Data\u003cdyn Cache\u003e,\n    path: Path\u003c(String, String, String)\u003e,\n) -\u003e impl Responder {\n    REQUESTS_DATA_COUNTER.inc();\n    let (token, chapter_hash, file_name) = path.into_inner();\n    if VALIDATE_TOKENS.load(Ordering::Acquire) {\n        if let Err(e) = validate_token(\u0026state.0.read().precomputed_key, token, \u0026chapter_hash) {\n            return ServerResponse::TokenValidationError(e);\n        }\n    }\n    fetch_image(state, cache, chapter_hash, file_name, false).await\n}\n\n#[allow(clippy::future_not_send)]\n#[get(\"/{token}/data-saver/{chapter_hash}/{file_name}\")]\nasync fn token_data_saver(\n    state: Data\u003cRwLockServerState\u003e,\n    cache: Data\u003cdyn Cache\u003e,\n    path: Path\u003c(String, String, String)\u003e,\n) -\u003e impl Responder {\n    REQUESTS_DATA_SAVER_COUNTER.inc();\n    let (token, chapter_hash, file_name) = path.into_inner();\n    if VALIDATE_TOKENS.load(Ordering::Acquire) {\n        if let Err(e) = validate_token(\u0026state.0.read().precomputed_key, token, \u0026chapter_hash) {\n            return ServerResponse::TokenValidationError(e);\n        }\n    }\n\n    fetch_image(state, cache, chapter_hash, file_name, true).await\n}\n\n#[allow(clippy::future_not_send)]\npub async fn default(state: Data\u003cRwLockServerState\u003e, req: HttpRequest) -\u003e impl Responder {\n    REQUESTS_OTHER_COUNTER.inc();\n    let path = \u0026format!(\n        \"{}{}\",\n        state.0.read().image_server,\n        req.path().chars().skip(1).collect::\u003cString\u003e()\n    );\n\n    if OFFLINE_MODE.load(Ordering::Acquire) {\n        info!(\"Got unknown path in offline mode, returning 404: {}\", path);\n        return ServerResponse::HttpResponse(\n            ErrorNotFound(\"Path is not valid in offline mode\").into(),\n        );\n    }\n\n    info!(\"Got unknown path, just proxying: {}\", path);\n\n    let mut resp = match HTTP_CLIENT.inner().get(path).send().await {\n        Ok(resp) =\u003e resp,\n        Err(e) =\u003e {\n            error!(\"{}\", e);\n            return ServerResponse::HttpResponse(HttpResponse::BadGateway().finish());\n        }\n    };\n    let content_type = resp.headers_mut().remove(CONTENT_TYPE);\n    let mut resp_builder = HttpResponseBuilder::new(resp.status());\n    let mut headers = DEFAULT_HEADERS.clone();\n    if let Some(content_type) = content_type {\n        headers.insert(CONTENT_TYPE, content_type);\n    }\n    // push_headers(\u0026mut resp_builder);\n\n    let mut resp = resp_builder.body(resp.bytes().await.unwrap_or_default());\n    *resp.headers_mut() = headers;\n    ServerResponse::HttpResponse(resp)\n}\n\n#[allow(clippy::future_not_send, clippy::unused_async)]\n#[get(\"/metrics\")]\npub async fn metrics() -\u003e impl Responder {\n    let metric_families = prometheus::gather();\n    let mut buffer = Vec::new();\n    TextEncoder::new()\n        .encode(\u0026metric_families, \u0026mut buffer)\n        .unwrap();\n    String::from_utf8(buffer).unwrap()\n}\n\n#[derive(Error, Debug)]\npub enum TokenValidationError {\n    #[error(\"Failed to decode base64 token.\")]\n    DecodeError(#[from] DecodeError),\n    #[error(\"Nonce was too short.\")]\n    IncompleteNonce,\n    #[error(\"Invalid nonce.\")]\n    InvalidNonce,\n    #[error(\"Decryption failed\")]\n    DecryptionFailure,\n    #[error(\"The token format was invalid.\")]\n    InvalidToken,\n    #[error(\"The token has expired.\")]\n    TokenExpired,\n    #[error(\"Invalid chapter hash.\")]\n    InvalidChapterHash,\n}\n\nimpl Responder for TokenValidationError {\n    #[inline]\n    fn respond_to(self, _: \u0026HttpRequest) -\u003e HttpResponse {\n        let mut resp = HttpResponse::Forbidden().finish();\n        *resp.headers_mut() = DEFAULT_HEADERS.clone();\n        resp\n    }\n}\n\nfn validate_token(\n    precomputed_key: \u0026PrecomputedKey,\n    token: String,\n    chapter_hash: \u0026str,\n) -\u003e Result\u003c(), TokenValidationError\u003e {\n    #[derive(Deserialize)]\n    struct Token\u003c'a\u003e {\n        expires: DateTime\u003cUtc\u003e,\n        hash: \u0026'a str,\n    }\n\n    let data = base64::decode_config(token, BASE64_CONFIG)?;\n    if data.len() \u003c NONCEBYTES {\n        return Err(TokenValidationError::IncompleteNonce);\n    }\n\n    let (nonce, encrypted) = data.split_at(NONCEBYTES);\n\n    let nonce = Nonce::from_slice(nonce).ok_or(TokenValidationError::InvalidNonce)?;\n    let decrypted = open_precomputed(encrypted, \u0026nonce, precomputed_key)\n        .map_err(|_| TokenValidationError::DecryptionFailure)?;\n\n    let parsed_token: Token =\n        serde_json::from_slice(\u0026decrypted).map_err(|_| TokenValidationError::InvalidToken)?;\n\n    if parsed_token.expires \u003c Utc::now() {\n        return Err(TokenValidationError::TokenExpired);\n    }\n\n    if parsed_token.hash != chapter_hash {\n        return Err(TokenValidationError::InvalidChapterHash);\n    }\n\n    debug!(\"Token validated!\");\n\n    Ok(())\n}\n\n#[allow(clippy::future_not_send)]\nasync fn fetch_image(\n    state: Data\u003cRwLockServerState\u003e,\n    cache: Data\u003cdyn Cache\u003e,\n    chapter_hash: String,\n    file_name: String,\n    is_data_saver: bool,\n) -\u003e ServerResponse {\n    let key = CacheKey(chapter_hash, file_name, is_data_saver);\n\n    match cache.get(\u0026key).await {\n        Some(Ok((image, metadata))) =\u003e {\n            CACHE_HIT_COUNTER.inc();\n            return construct_response(image, \u0026metadata);\n        }\n        Some(Err(_)) =\u003e {\n            return ServerResponse::HttpResponse(HttpResponse::BadGateway().finish());\n        }\n        None =\u003e (),\n    }\n\n    CACHE_MISS_COUNTER.inc();\n\n    // If in offline mode, return early since there's nothing else we can do\n    if OFFLINE_MODE.load(Ordering::Acquire) {\n        return ServerResponse::HttpResponse(\n            ErrorNotFound(\"Offline mode enabled and image not in cache\").into(),\n        );\n    }\n\n    let url = if is_data_saver {\n        format!(\n            \"{}/data-saver/{}/{}\",\n            state.0.read().image_server,\n            \u0026key.0,\n            \u0026key.1,\n        )\n    } else {\n        format!(\"{}/data/{}/{}\", state.0.read().image_server, \u0026key.0, \u0026key.1)\n    };\n\n    match HTTP_CLIENT.fetch_and_cache(url, key, cache).await {\n        FetchResult::ServiceUnavailable =\u003e {\n            ServerResponse::HttpResponse(HttpResponse::ServiceUnavailable().finish())\n        }\n        FetchResult::InternalServerError =\u003e {\n            ServerResponse::HttpResponse(HttpResponse::InternalServerError().finish())\n        }\n        FetchResult::Data(status, headers, data) =\u003e {\n            let mut resp = HttpResponseBuilder::new(status);\n            let mut resp = resp.body(data);\n            *resp.headers_mut() = headers;\n            ServerResponse::HttpResponse(resp)\n        }\n        FetchResult::Processing =\u003e panic!(\"Race condition found with fetch result\"),\n    }\n}\n\n#[inline]\npub fn construct_response(\n    data: impl Stream\u003cItem = Result\u003cBytes, UpstreamError\u003e\u003e + Unpin + 'static,\n    metadata: \u0026ImageMetadata,\n) -\u003e ServerResponse {\n    trace!(\"Constructing response\");\n\n    let mut resp = HttpResponse::Ok();\n\n    let mut headers = DEFAULT_HEADERS.clone();\n    if let Some(content_type) = metadata.content_type {\n        headers.insert(\n            CONTENT_TYPE,\n            HeaderValue::from_str(content_type.as_ref()).unwrap(),\n        );\n    }\n\n    if let Some(content_length) = metadata.content_length {\n        headers.insert(CONTENT_LENGTH, HeaderValue::from(content_length));\n    }\n\n    if let Some(last_modified) = metadata.last_modified {\n        headers.insert(\n            LAST_MODIFIED,\n            HeaderValue::from_str(\u0026last_modified.to_rfc2822()).unwrap(),\n        );\n    }\n\n    let mut ret = resp.streaming(data);\n    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OnceCell\u003cArcSwap\u003cBox\u003cdyn SigningKey\u003e\u003e\u003e = OnceCell::new();\npub static TLS_CERTS: OnceCell\u003cArcSwap\u003cVec\u003cCertificate\u003e\u003e\u003e = OnceCell::new();\n\n#[derive(Error, Debug)]\npub enum ServerInitError {\n    #[error(transparent)]\n    MalformedResponse(reqwest::Error),\n    #[error(transparent)]\n    Timeout(reqwest::Error),\n    #[error(transparent)]\n    SendFailure(reqwest::Error),\n    #[error(\"Failed to parse token key\")]\n    KeyParseError(String),\n    #[error(\"Token key was not provided in initial request\")]\n    MissingTokenKey,\n    #[error(\"Got error response from control center\")]\n    ErrorResponse,\n}\n\nimpl ServerState {\n    pub async fn init(secret: \u0026ClientSecret, config: \u0026Config) -\u003e Result\u003cSelf, ServerInitError\u003e {\n        let resp = reqwest::Client::new()\n            .post(CONTROL_CENTER_PING_URL)\n            .json(\u0026Request::from((secret, config)))\n            .send()\n            .await;\n\n        match resp {\n            Ok(resp) =\u003e match resp.json::\u003cResponse\u003e().await {\n                Ok(Response::Ok(mut resp)) =\u003e {\n                    let key = resp\n                        .token_key\n                        .ok_or(ServerInitError::MissingTokenKey)\n                        .and_then(|key| {\n                            if let Some(key) = base64::decode(\u0026key)\n                                .ok()\n                                .and_then(|k| PrecomputedKey::from_slice(\u0026k))\n                            {\n                                Ok(key)\n                            } else {\n                                error!(\"Failed to parse token key: got {}\", key);\n                                Err(ServerInitError::KeyParseError(key))\n                            }\n                        })?;\n\n                    PREVIOUSLY_COMPROMISED.store(resp.compromised, Ordering::Release);\n                    if resp.compromised {\n                        error!(\"Got compromised response from control center!\");\n                    }\n\n                    PREVIOUSLY_PAUSED.store(resp.paused, Ordering::Release);\n                    if resp.paused {\n                        warn!(\"Control center has paused this node!\");\n                    }\n\n                    if let Some(ref override_url) = config.override_upstream {\n                        resp.image_server = override_url.clone();\n                        warn!(\"Upstream URL overridden to: {}\", resp.image_server);\n                    } else {\n                    }\n\n                    info!(\"This client's URL has been set to {}\", resp.url);\n\n                    if config\n                        .unstable_options\n                        .contains(\u0026UnstableOptions::DisableTokenValidation)\n                    {\n                        warn!(\"Token validation is explicitly disabled!\");\n                    } else 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config.override_upstream.is_some(),\n                    })\n                }\n                Ok(Response::Error(resp)) =\u003e {\n                    error!(\n                        \"Got an {} error from upstream: {}\",\n                        resp.status as u16, resp.error\n                    );\n                    Err(ServerInitError::ErrorResponse)\n                }\n                Err(e) =\u003e {\n                    error!(\"Got malformed response: {}. Is MangaDex@Home down?\", e);\n                    Err(ServerInitError::MalformedResponse(e))\n                }\n            },\n            Err(e) =\u003e match e {\n                e if e.is_timeout() =\u003e {\n                    error!(\"Response timed out to control server. Is MangaDex@Home down?\");\n                    Err(ServerInitError::Timeout(e))\n                }\n                e =\u003e {\n                    error!(\"Failed to send request: {}\", e);\n                    Err(ServerInitError::SendFailure(e))\n                }\n            },\n        }\n    }\n\n    pub fn init_offline() -\u003e Self {\n        assert!(OFFLINE_MODE.load(Ordering::Acquire));\n        Self {\n            precomputed_key: PrecomputedKey::from_slice(\u0026[41; PRECOMPUTEDKEYBYTES]).unwrap(),\n            image_server: Url::from_file_path(\"/dev/null\").unwrap(),\n            url: Url::from_str(\"http://localhost\").unwrap(),\n            url_overridden: false,\n        }\n    }\n}\n\npub struct RwLockServerState(pub RwLock\u003cServerState\u003e);\n\npub struct DynamicServerCert;\n\nimpl ResolvesServerCert for DynamicServerCert {\n    fn resolve(\u0026self, _: ClientHello) -\u003e Option\u003cCertifiedKey\u003e {\n        // TODO: wait for actix-web to use a new 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log::{info, warn};\nuse reqwest::StatusCode;\nuse serde::Serialize;\n\nuse crate::config::ClientSecret;\n\nconst CONTROL_CENTER_STOP_URL: \u0026str = \"https://api.mangadex.network/ping\";\n\n#[derive(Serialize)]\nstruct StopRequest\u003c'a\u003e {\n    secret: \u0026'a ClientSecret,\n}\n\npub async fn send_stop(secret: \u0026ClientSecret) {\n    let request = StopRequest { secret };\n    let client = reqwest::Client::new();\n    match client\n        .post(CONTROL_CENTER_STOP_URL)\n        .json(\u0026request)\n        .send()\n        .await\n    {\n        Ok(resp) =\u003e {\n            if resp.status() == StatusCode::OK {\n                info!(\"Successfully sent stop message to control center.\");\n            } else {\n                warn!(\"Got weird response from server: {:?}\", resp.headers());\n            }\n        }\n        Err(e) =\u003e warn!(\"Got error while sending stop message: {}\", e),\n    }\n}\n","traces":[{"line":14,"address":[4532986,4533029,4530999,4530918,4530896,4530960],"length":1,"stats":{"Line":0},"fn_name":"send_stop"},{"line":15,"address":[4531073],"length":1,"stats":{"Line":0},"fn_name":null},{"line":16,"address":[4531077],"length":1,"stats":{"Line":0},"fn_name":null},{"line":17,"address":[4531305,4533016,4531621,4531138,4531197,4532908],"length":1,"stats":{"Line":0},"fn_name":null},{"line":19,"address":[4531177],"length":1,"stats":{"Line":0},"fn_name":null},{"line":23,"address":[4531623,4531544],"length":1,"stats":{"Line":0},"fn_name":null},{"line":24,"address":[4531663,4532053,4532417],"length":1,"stats":{"Line":0},"fn_name":null},{"line":25,"address":[4531735,4531897,4531821],"length":1,"stats":{"Line":0},"fn_name":null},{"line":27,"address":[4532134,4531778,4532058],"length":1,"stats":{"Line":0},"fn_name":null},{"line":30,"address":[4532441,4532850,4531559,4532517],"length":1,"stats":{"Line":0},"fn_name":null}],"covered":0,"coverable":10},{"path":["/","home","edward","Documents","repos","mangadex-home","src","units.rs"],"content":"use 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{\n    type Err = ParseIntError;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        s.parse::\u003cusize\u003e().map(Self)\n    }\n}\n\npub struct Bytes(usize);\n\nimpl Bytes {\n    pub const fn get(\u0026self) -\u003e usize {\n        self.0\n    }\n}\n\nimpl From\u003cMebibytes\u003e for Bytes {\n    fn from(mib: Mebibytes) -\u003e Self {\n        Self(mib.0 \u003c\u003c 20)\n    }\n}\n\n#[derive(Copy, Clone, Deserialize, Debug, Hash, Eq, PartialEq)]\npub struct KilobitsPerSecond(NonZeroU64);\n\nimpl FromStr for KilobitsPerSecond {\n    type Err = ParseIntError;\n\n    fn from_str(s: \u0026str) -\u003e Result\u003cSelf, Self::Err\u003e {\n        s.parse::\u003cNonZeroU64\u003e().map(Self)\n    }\n}\n\n#[derive(Copy, Clone, Serialize, Debug, Hash, Eq, PartialEq)]\npub struct BytesPerSecond(NonZeroU64);\n\nimpl From\u003cKilobitsPerSecond\u003e for BytesPerSecond {\n    fn from(kbps: KilobitsPerSecond) -\u003e Self {\n        Self(unsafe { NonZeroU64::new_unchecked(kbps.0.get() * 125) })\n    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