[pbs-devel] [PATCH proxmox-backup 4/4] pxar: use anyhow::Error in PxarBackupStream

[Gabriel Goller]

Instead of storing the error as a string in the PxarBackupStream, we
store it as an anyhow::Error. As we can't clone an anyhow::Error, we take
it out from the mutex and return it. This won't change anything as
the consumation of the stream will stop if it gets a Some(Err(..)).

Signed-off-by: Gabriel Goller <g.goller at proxmox.com>
---
 pbs-client/src/pxar_backup_stream.rs | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/pbs-client/src/pxar_backup_stream.rs b/pbs-client/src/pxar_backup_stream.rs
index 22a6ffdc..4dbfd472 100644
--- a/pbs-client/src/pxar_backup_stream.rs
+++ b/pbs-client/src/pxar_backup_stream.rs
@@ -5,7 +5,7 @@ use std::pin::Pin;
 use std::sync::{Arc, Mutex};
 use std::task::{Context, Poll};
 
-use anyhow::{format_err, Error};
+use anyhow::Error;
 use futures::future::{AbortHandle, Abortable};
 use futures::stream::Stream;
 use nix::dir::Dir;
@@ -25,7 +25,7 @@ use pbs_datastore::catalog::CatalogWriter;
 pub struct PxarBackupStream {
     rx: Option<std::sync::mpsc::Receiver<Result<Vec<u8>, Error>>>,
     handle: Option<AbortHandle>,
-    error: Arc<Mutex<Option<String>>>,
+    error: Arc<Mutex<Option<Error>>>,
 }
 
 impl Drop for PxarBackupStream {
@@ -68,7 +68,7 @@ impl PxarBackupStream {
             .await
             {
                 let mut error = error2.lock().unwrap();
-                *error = Some(err.to_string());
+                *error = Some(err);
             }
         };
 
@@ -100,18 +100,20 @@ impl Stream for PxarBackupStream {
     fn poll_next(self: Pin<&mut Self>, _cx: &mut Context) -> Poll<Option<Self::Item>> {
         {
             // limit lock scope
-            let error = self.error.lock().unwrap();
-            if let Some(ref msg) = *error {
-                return Poll::Ready(Some(Err(format_err!("{}", msg))));
+            let mut error = self.error.lock().unwrap();
+            if error.is_some() {
+                let err = error.take().unwrap();
+                return Poll::Ready(Some(Err(err)));
             }
         }
 
         match proxmox_async::runtime::block_in_place(|| self.rx.as_ref().unwrap().recv()) {
             Ok(data) => Poll::Ready(Some(data)),
             Err(_) => {
-                let error = self.error.lock().unwrap();
-                if let Some(ref msg) = *error {
-                    return Poll::Ready(Some(Err(format_err!("{}", msg))));
+                let mut error = self.error.lock().unwrap();
+                if error.is_some() {
+                    let err = error.take().unwrap();
+                    return Poll::Ready(Some(Err(err)));
                 }
                 Poll::Ready(None) // channel closed, no error
             }
-- 
2.43.0