Remove a few boxes

src/error.rs

@@ -128,6 +128,9 @@ pub(crate) enum UploadError {
 
     #[error("Command failed")]
     Status,
+
+    #[error(transparent)]
+    Limit(#[from] super::LimitError),
 }
 
 impl From<awc::error::SendRequestError> for UploadError {
@@ -152,6 +155,7 @@ impl ResponseError for Error {
     fn status_code(&self) -> StatusCode {
         match self.kind {
             UploadError::DuplicateAlias
+            | UploadError::Limit(_)
             | UploadError::NoFiles
             | UploadError::Upload(_)
             | UploadError::ParseReq(_) => StatusCode::BAD_REQUEST,

src/file.rs

@@ -11,12 +11,18 @@ pub(crate) use io_uring::File;
 pub(crate) use tokio_file::File;
 
 pin_project_lite::pin_project! {
-    struct CrateError<S> {
+    pub(super) struct CrateError<S> {
         #[pin]
         inner: S
     }
 }
 
+impl<S> CrateError<S> {
+    pub(super) fn new(inner: S) -> Self {
+        CrateError { inner }
+    }
+}
+
 impl<T, E, S> Stream for CrateError<S>
 where
     S: Stream<Item = Result<T, E>>,
@@ -112,11 +118,10 @@ mod tokio_file {
                 (None, None) => Either::right(self.inner),
             };
 
-            Ok(super::CrateError {
-                inner: BytesFreezer {
-                    inner: FramedRead::new(obj, BytesCodec::new()),
-                },
-            })
+            Ok(super::CrateError::new(BytesFreezer::new(FramedRead::new(
+                obj,
+                BytesCodec::new(),
+            ))))
         }
     }
 
@@ -127,6 +132,12 @@ mod tokio_file {
         }
     }
 
+    impl<S> BytesFreezer<S> {
+        fn new(inner: S) -> Self {
+            BytesFreezer { inner }
+        }
+    }
+
     impl<S, E> Stream for BytesFreezer<S>
     where
         S: Stream<Item = Result<BytesMut, E>> + Unpin,

src/main.rs

@@ -57,6 +57,7 @@ use self::{
     config::{Config, Format},
     either::Either,
     error::{Error, UploadError},
+    file::CrateError,
     middleware::{Deadline, Internal},
     upload_manager::{Details, UploadManager, UploadManagerSession},
     validate::{image_webp, video_mp4},
@@ -340,6 +341,59 @@ struct UrlQuery {
     url: String,
 }
 
+pin_project_lite::pin_project! {
+    struct Limit<S> {
+        #[pin]
+        inner: S,
+
+        count: u64,
+        limit: u64,
+    }
+}
+
+impl<S> Limit<S> {
+    fn new(inner: S, limit: u64) -> Self {
+        Limit {
+            inner,
+            count: 0,
+            limit,
+        }
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+#[error("Resonse body larger than size limit")]
+struct LimitError;
+
+impl<S, E> Stream for Limit<S>
+where
+    S: Stream<Item = Result<web::Bytes, E>>,
+    E: From<LimitError>,
+{
+    type Item = Result<web::Bytes, E>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        let this = self.as_mut().project();
+
+        let limit = this.limit;
+        let count = this.count;
+        let inner = this.inner;
+
+        inner.poll_next(cx).map(|opt| {
+            opt.map(|res| match res {
+                Ok(bytes) => {
+                    *count += bytes.len() as u64;
+                    if *count > *limit {
+                        return Err(LimitError.into());
+                    }
+                    Ok(bytes)
+                }
+                Err(e) => Err(e),
+            })
+        })
+    }
+}
+
 /// download an image from a URL
 #[instrument(name = "Downloading file", skip(client, manager))]
 async fn download(
@@ -347,15 +401,19 @@ async fn download(
     manager: web::Data<UploadManager>,
     query: web::Query<UrlQuery>,
 ) -> Result<HttpResponse, Error> {
-    let mut res = client.get(&query.url).propagate().send().await?;
+    let res = client.get(&query.url).propagate().send().await?;
 
     if !res.status().is_success() {
         return Err(UploadError::Download(res.status()).into());
     }
 
-    let fut = res.body().limit(CONFIG.max_file_size() * MEGABYTES);
+    let mut stream = Limit::new(
+        CrateError::new(res),
+        (CONFIG.max_file_size() * MEGABYTES) as u64,
+    );
 
-    let stream = Box::pin(once(fut));
+    // SAFETY: stream is shadowed, so original cannot not be moved
+    let stream = unsafe { Pin::new_unchecked(&mut stream) };
 
     let permit = PROCESS_SEMAPHORE.acquire().await?;
     let session = manager.session().upload(stream).await?;
@@ -743,7 +801,7 @@ async fn ranged_file_resp(
 
     Ok(srv_response(
         builder,
-        Box::pin(stream),
+        stream,
         details.content_type(),
         7 * DAYS,
         details.system_time(),
@@ -759,7 +817,7 @@ fn srv_response<S, E>(
     modified: SystemTime,
 ) -> HttpResponse
 where
-    S: Stream<Item = Result<web::Bytes, E>> + Unpin + 'static,
+    S: Stream<Item = Result<web::Bytes, E>> + 'static,
     E: std::error::Error + 'static,
     actix_web::Error: From<E>,
 {
@@ -772,7 +830,8 @@ where
         ]))
         .insert_header((ACCEPT_RANGES, "bytes"))
         .content_type(ext.to_string())
-        .streaming(stream)
+        // TODO: remove pin when actix-web drops Unpin requirement
+        .streaming(Box::pin(stream))
 }
 
 #[derive(Debug, serde::Deserialize)]

src/stream.rs

@@ -22,12 +22,19 @@ pub(crate) struct Process {
     span: Span,
 }
 
-pub(crate) struct ProcessRead<I> {
-    inner: I,
-    span: Span,
-    err_recv: Receiver<std::io::Error>,
-    err_closed: bool,
-    handle: JoinHandle<()>,
+struct DropHandle {
+    inner: JoinHandle<()>,
+}
+
+pin_project_lite::pin_project! {
+    struct ProcessRead<I> {
+        #[pin]
+        inner: I,
+        span: Span,
+        err_recv: Receiver<std::io::Error>,
+        err_closed: bool,
+        handle: DropHandle,
+    }
 }
 
 impl Process {
@@ -86,13 +93,13 @@ impl Process {
             .instrument(span),
         );
 
-        Some(Box::pin(ProcessRead {
+        Some(ProcessRead {
             inner: stdout,
             span: self.span,
             err_recv: rx,
             err_closed: false,
-            handle,
-        }))
+            handle: DropHandle { inner: handle },
+        })
     }
 
     pub(crate) fn file_read(
@@ -129,30 +136,36 @@ impl Process {
             .instrument(span),
         );
 
-        Some(Box::pin(ProcessRead {
+        Some(ProcessRead {
             inner: stdout,
             span: self.span,
             err_recv: rx,
             err_closed: false,
-            handle,
-        }))
+            handle: DropHandle { inner: handle },
+        })
     }
 }
 
 impl<I> AsyncRead for ProcessRead<I>
 where
-    I: AsyncRead + Unpin,
+    I: AsyncRead,
 {
     fn poll_read(
         mut self: Pin<&mut Self>,
         cx: &mut Context<'_>,
         buf: &mut ReadBuf<'_>,
     ) -> Poll<std::io::Result<()>> {
-        let span = self.span.clone();
+        let this = self.as_mut().project();
+
+        let span = this.span;
+        let err_recv = this.err_recv;
+        let err_closed = this.err_closed;
+        let inner = this.inner;
+
         span.in_scope(|| {
-            if !self.err_closed {
-                if let Poll::Ready(res) = Pin::new(&mut self.err_recv).poll(cx) {
-                    self.err_closed = true;
+            if !*err_closed {
+                if let Poll::Ready(res) = Pin::new(err_recv).poll(cx) {
+                    *err_closed = true;
                     if let Ok(err) = res {
                         let display = format!("{}", err);
                         let debug = format!("{:?}", err);
@@ -163,7 +176,7 @@ where
                 }
             }
 
-            if let Poll::Ready(res) = Pin::new(&mut self.inner).poll_read(cx, buf) {
+            if let Poll::Ready(res) = inner.poll_read(cx, buf) {
                 if let Err(err) = &res {
                     let display = format!("{}", err);
                     let debug = format!("{:?}", err);
@@ -178,9 +191,9 @@ where
     }
 }
 
-impl<I> Drop for ProcessRead<I> {
+impl Drop for DropHandle {
     fn drop(&mut self) {
-        self.handle.abort();
+        self.inner.abort();
     }
 }
 

src/upload_manager/session.rs

@@ -9,15 +9,13 @@ use crate::{
     },
 };
 use actix_web::web;
-use futures_util::stream::{LocalBoxStream, StreamExt};
+use futures_util::stream::{Stream, StreamExt};
 use std::path::PathBuf;
 use tokio::io::AsyncRead;
 use tracing::{debug, instrument, warn, Span};
 use tracing_futures::Instrument;
 use uuid::Uuid;
 
-type UploadStream<E> = LocalBoxStream<'static, Result<web::Bytes, E>>;
-
 pub(crate) struct UploadManagerSession {
     manager: UploadManager,
     alias: Option<String>,
@@ -136,7 +134,7 @@ impl UploadManagerSession {
         alias: String,
         content_type: mime::Mime,
         validate: bool,
-        mut stream: UploadStream<E>,
+        mut stream: impl Stream<Item = Result<web::Bytes, E>> + Unpin,
     ) -> Result<Self, Error>
     where
         Error: From<E>,
@@ -177,7 +175,10 @@ impl UploadManagerSession {
 
     /// Upload the file, discarding bytes if it's already present, or saving if it's new
     #[instrument(skip(self, stream))]
-    pub(crate) async fn upload<E>(mut self, mut stream: UploadStream<E>) -> Result<Self, Error>
+    pub(crate) async fn upload<E>(
+        mut self,
+        mut stream: impl Stream<Item = Result<web::Bytes, E>> + Unpin,
+    ) -> Result<Self, Error>
     where
         Error: From<E>,
     {