Resolve clippy lints

src/cache/fs.rs

@@ -15,10 +15,11 @@
 //! misses are treated as closer as a cache hit.
 
 use std::collections::HashMap;
+use std::convert::TryFrom;
 use std::error::Error;
 use std::fmt::Display;
 use std::io::SeekFrom;
-use std::num::NonZeroU32;
+use std::num::NonZeroUsize;
 use std::path::{Path, PathBuf};
 use std::pin::Pin;
 use std::task::{Context, Poll};
@@ -26,7 +27,7 @@ use std::task::{Context, Poll};
 use actix_web::error::PayloadError;
 use bytes::{Buf, Bytes, BytesMut};
 use futures::{Future, Stream, StreamExt};
-use log::{debug, warn};
+use log::{debug, error, warn};
 use once_cell::sync::Lazy;
 use serde::{Deserialize, Serialize};
 use sodiumoxide::crypto::secretstream::{
@@ -236,7 +237,7 @@ where
     tokio::spawn(async move {
         let path_buf = path_buf; // moves path buf into async
         let mut errored = false;
-        let mut bytes_written = 0;
+        let mut bytes_written: u32 = 0;
         let mut acc_bytes = BytesMut::new();
         let accumulate = on_complete.is_some();
         writer.write_all(metadata_string.as_bytes()).await?;
@@ -253,7 +254,21 @@ where
                         0 => break,
                         n => {
                             bytes.advance(n);
-                            bytes_written += n as u32;
+                            let n = if let Ok(n) = u32::try_from(n) {
+                                n
+                            } else {
+                                error!("Tried to advance larger than an u32?");
+                                errored = true;
+                                break;
+                            };
+                            let (new_size, overflowed) = bytes_written.overflowing_add(n);
+                            if overflowed {
+                                error!("File size was larger than u32! Aborting!");
+                                errored = true;
+                                break;
+                            }
+                            bytes_written = new_size;
+
                             // We don't care if we don't have receivers
                             let _ = tx.send(WritingStatus::NotDone);
                         }
@@ -393,10 +408,10 @@ pub struct ConcurrentFsStream {
     /// this reader will never complete.
     receiver: Pin<Box<WatchStream<WritingStatus>>>,
     /// The number of bytes the reader has read
-    bytes_read: u32,
+    bytes_read: usize,
     /// The number of bytes that the writer has reported it has written. If the
     /// writer has not reported yet, this value is None.
-    bytes_total: Option<NonZeroU32>,
+    bytes_total: Option<NonZeroUsize>,
 }
 
 impl ConcurrentFsStream {
@@ -465,7 +480,8 @@ impl Stream for ConcurrentFsStream {
             if let Poll::Ready(Some(WritingStatus::Done(n))) =
                 self.receiver.as_mut().poll_next_unpin(cx)
             {
-                self.bytes_total = Some(NonZeroU32::new(n).expect("Stored a 0 byte image?"))
+                self.bytes_total =
+                    Some(NonZeroUsize::new(n as usize).expect("Stored a 0 byte image?"))
             }
 
             // Okay, now we know if we've read enough bytes or not. If the
@@ -488,7 +504,7 @@ impl Stream for ConcurrentFsStream {
             Poll::Ready(Some(Ok(Bytes::new())))
         } else {
             // We have data! Give it to the reader!
-            self.bytes_read += filled as u32;
+            self.bytes_read += filled;
             bytes.truncate(filled);
             Poll::Ready(Some(Ok(bytes.into())))
         }