[pbs-devel] [PATCH proxmox-backup 5/9] file-restore-daemon: work around tokio DuplexStream bug

[Stefan Reiter <s.reiter@proxmox.com>]

See this PR for more info: https://github.com/tokio-rs/tokio/pull/3756

As a workaround use a pair of connected unix sockets - this obviously
incurs some overhead, albeit not measureable on my machine. Once tokio
includes the fix we can go back to a DuplexStream for performance and
simplicity.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
---

Thanks to @Wolfgang for helping debug this!

 src/bin/proxmox_restore_daemon/api.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/bin/proxmox_restore_daemon/api.rs b/src/bin/proxmox_restore_daemon/api.rs
index f1d601ce..5aeb69f3 100644
--- a/src/bin/proxmox_restore_daemon/api.rs
+++ b/src/bin/proxmox_restore_daemon/api.rs
@@ -275,7 +275,11 @@ fn extract(
             bail!("file or directory {:?} does not exist", path);
         }
 
-        let (mut writer, reader) = tokio::io::duplex(1024 * 64);
+        // FIXME: DuplexStream is currently broken and doesn't wake pending writers on close, i.e.
+        // this doesn't drop the WatchdogInhibitor if we encounter an error (client aborts, etc...)
+        // see: https://github.com/tokio-rs/tokio/pull/3756
+        // let (mut writer, reader) = tokio::io::duplex(1024 * 64);
+        let (mut writer, reader) = tokio::net::UnixStream::pair()?;
 
         if pxar {
             tokio::spawn(async move {
-- 
2.20.1