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async-broadcast returns Overflowed error once if channel overflow happened. Public APIs such as get_next_event JSON-RPC method are only expecting an error if the channel is closed, so we should not propagate overflow error outside. In particular, Delta Chat Desktop stop receiving events completely if an error is returned once. If overflow happens, we should ignore it and try again until we get an event or an error because the channel is closed (in case of recv()) or empty (in case of try_recv()).
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The problem exists since switch to async-broadcast in #5478. I discovered the problem while playing with realtime channels with webxdc and creating too many WebxdcRealtimeData events. |
Simon-Laux
approved these changes
May 20, 2024
iequidoo
reviewed
May 21, 2024
| Err(async_broadcast::RecvError::Overflowed(_)) => { | ||
| // Some events have been lost, | ||
| // but the channel is not closed. | ||
| continue; |
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Maybe it's worth returning a special event telling that some events are lost? I.e. if we don't see such an event in the log, then no events are missing
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async-broadcast returns Overflowed error once
if channel overflow happened.
Public APIs such as get_next_event JSON-RPC method are only expecting an error if the channel is closed, so we should not propagate overflow error outside. In particular, Delta Chat Desktop
stop receiving events completely if an error
is returned once.
If overflow happens, we should ignore it
and try again until we get an event or an error because the channel is closed (in case of recv())
or empty (in case of try_recv()).