[pbs-devel] [PATCH v2 proxmox-backup 3/3] client: reader: signal server before client disconnect

[Fabian Grünbichler]

On December 4, 2024 9:31 am, Christian Ebner wrote:
> Signal the server that the client has successfully finished its
> operation and is about to close the connection. This allows the server
> side to react and clean up the connection, without returning and
> logging an error state, as that can cause confusion [0], as this is
> not an error but normal behaviour.
> 
> Report in the community forum:
> [0] https://forum.proxmox.com/threads/158306/
> 
> Signed-off-by: Christian Ebner <c.ebner at proxmox.com>
> ---
> changes since version 1:
> - no changes
> 
> Note:
> I am not sure this is the best approach, as this might block the
> thread until the server responds or it runs into a time out.
> 
> The alternative would require completely reworking all backup reader
> related call sides. Or maybe there is another alternative?
> 
>  pbs-client/src/backup_reader.rs | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/pbs-client/src/backup_reader.rs b/pbs-client/src/backup_reader.rs
> index 88cba599b..63106c999 100644
> --- a/pbs-client/src/backup_reader.rs
> +++ b/pbs-client/src/backup_reader.rs
> @@ -27,6 +27,8 @@ pub struct BackupReader {
>  
>  impl Drop for BackupReader {
>      fn drop(&mut self) {
> +        // Ignore errors
> +        let _ = proxmox_async::runtime::block_on(self.post("finish", None));

should we maybe make this explicit, like we do in the BackupWriter? I
know that it's a bit less "obvious" here compared to writer sessions
what constitutes success/being finished ;)

means a bit more churn now to adapt the users of BackupReader, but would
make it possible to differentiate server side whether a reader session
was exited normally or via an error?

we could even provide some sort of message via the finish API call that
the server could log if desired, differentiating between:

- regular finish (no error/warning)
- finish called with a warning message (warning)
- finish not called, reader went away (error)

?

>          self.abort.abort();
>      }
>  }
> -- 
> 2.39.5
> 
> 
> 
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