src/bin/proxmox-backup-client.rs: use a std channel to write the catalog

src/tools/wrapped_reader_stream.rs

@@ -1,11 +1,14 @@
 use std::io::{self, Read};
 use std::pin::Pin;
 use std::task::{Context, Poll};
+use std::sync::mpsc::Receiver;
+
 
 use futures::stream::Stream;
 
 use crate::tools::runtime::block_in_place;
 
+/// Wrapper struct to convert a Reader into a Stream
 pub struct WrappedReaderStream<R: Read + Unpin> {
     reader: R,
     buffer: Vec<u8>,
@@ -39,6 +42,21 @@ impl<R: Read + Unpin> Stream for WrappedReaderStream<R> {
     }
 }
 
+
+/// Wrapper struct to convert a channel Receiver into a Stream
+pub struct StdChannelStream<T>(pub Receiver<T>);
+
+impl<T> Stream for StdChannelStream<T> {
+    type Item = T;
+
+    fn poll_next(self: Pin<&mut Self>, _cx: &mut Context) -> Poll<Option<Self::Item>> {
+        match block_in_place(|| self.0.recv()) {
+            Ok(data) => Poll::Ready(Some(data)),
+            Err(_) => Poll::Ready(None),// channel closed
+        }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use std::io;