async fn download_stream(
    source: impl Into<RemoteDif>,
    stream: impl Stream<Item = Result<impl AsRef<[u8]>, DownloadError>>,
    destination: PathBuf,
    timeout: Option<Duration>,
) -> Result<DownloadStatus, DownloadError> {
    let source = source.into();

    // All file I/O in this function is blocking!
    log::trace!("Downloading from {}", source);
    let future = async {
        let mut file = File::create(&destination)
            .await
            .map_err(DownloadError::BadDestination)?;
        futures::pin_mut!(stream);

        let mut throughput_recorder =
            MeasureSourceDownloadGuard::new("source.download.stream", source.source_metric_key());
        let result: Result<_, DownloadError> = async {
            while let Some(chunk) = stream.next().await {
                let chunk = chunk?;
                let chunk = chunk.as_ref();
                throughput_recorder.add_bytes_transferred(chunk.len() as u64);
                file.write_all(chunk).await.map_err(DownloadError::Write)?;
            }
            Ok(())
        }
        .await;
        throughput_recorder.done(&result);
        result?;

        file.flush().await.map_err(DownloadError::Write)?;
        Ok(DownloadStatus::Completed)
    };

    match timeout {
        Some(timeout) => tokio::time::timeout(timeout, future)
            .await
            .map_err(|_| DownloadError::Canceled)?,
        None => future.await,
    }
}
/// Download the source from a stream.
///
/// This is common functionality used by many downloaders.
///
/// # Errors
/// - [`DownloadError::BadDestination`]
/// - [`DownloadError::Write`]
/// - [`DownloadError::Canceled`]
Download the source from a stream.
This is common functionality used by many downloaders.
Download the source from a stream . This is common functionality used by many downloaders .
async fn download_stream(
    source: impl Into<RemoteDif>,
    stream: impl Stream<Item = Result<impl AsRef<[u8]>, DownloadError>>,
    destination: PathBuf,
    timeout: Option<Duration>,
) -> Result<DownloadStatus, DownloadError> {
    let source = source.into();
    // All file I/O in this function is blocking!
    log::trace!("Downloading from {}", source);
    let future = async {
        let mut file = File::create(&destination)
            .await
            .map_err(DownloadError::BadDestination)?;
        futures::pin_mut!(stream);
        let mut throughput_recorder =
            MeasureSourceDownloadGuard::new("source.download.stream", source.source_metric_key());
        let result: Result<_, DownloadError> = async {
            while let Some(chunk) = stream.next().await {
                let chunk = chunk?;
                let chunk = chunk.as_ref();
                throughput_recorder.add_bytes_transferred(chunk.len() as u64);
                file.write_all(chunk).await.map_err(DownloadError::Write)?;
            }
            Ok(())
        }
        .await;
        throughput_recorder.done(&result);
        result?;
        file.flush().await.map_err(DownloadError::Write)?;
        Ok(DownloadStatus::Completed)
    };
    match timeout {
        Some(timeout) => tokio::time::timeout(timeout, future)
            .await
            .map_err(|_| DownloadError::Canceled)?,
        None => future.await,
    }
}
async fn download_stream ( source : impl Into < RemoteDif > , stream : impl Stream < Item = Result < impl AsRef < [ u8 ] > , DownloadError > > , destination : PathBuf , timeout : Option < Duration > , ) -> Result < DownloadStatus , DownloadError > { let source = source . into ( ) ; // All file I/O in this function is blocking! log :: trace ! ( " " source ) ; let future = async { let mut file = File :: create ( & destination ) . await . map_err ( DownloadError :: BadDestination ) ? ; futures :: pin_mut ! ( stream ) ; let mut throughput_recorder = MeasureSourceDownloadGuard :: new ( " " , source . source_metric_key ( ) ) ; let result : Result < _ , DownloadError > = async { while let Some ( chunk ) = stream . next ( ) . await { let chunk = chunk ? ; let chunk = chunk . as_ref ( ) ; throughput_recorder . add_bytes_transferred ( chunk . len ( ) as u64 ) ; file . write_all ( chunk ) . await . map_err ( DownloadError :: Write ) ? ; } Ok ( ( ) ) } . await ; throughput_recorder . done ( & result ) ; result ? ; file . flush ( ) . await . map_err ( DownloadError :: Write ) ? ; Ok ( DownloadStatus :: Completed ) } ; match timeout { Some ( timeout ) => tokio :: time :: timeout ( timeout , future ) . await . map_err ( | _ | DownloadError :: Canceled ) ? , None => future . await , } }
Download the source from a stream.
Download the source from a stream .
source
impl Into<RemoteDif>
stream
impl Stream<Item = Result<impl AsRef<[u8]>, DownloadError>>
destination
PathBuf
timeout
Option<Duration>
source
impl Into<RemoteDif>
stream
impl Stream<Item = Result<impl AsRef<[u8]>, DownloadError>>
destination
PathBuf
timeout
Option<Duration>
errors
None