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…13700) `Protocol` is not a reliable source for the information of connected peers because it doesn't have real-time information of the actual connectivity state because it's not resposible for accepting/rejecting connections and gets that information with delay from `SyncinEngine`.
…orker (paritytech#13730) * Remove `HeaderBackend` requirement from `NetworkWorker` * Remove HeaderBackend from authority-discovery
* Attempt to relieve pressure on `mpsc_network_worker` `SyncingEngine` interacting with `NetworkWorker` can put a lot of strain on the channel if the number of inbound connections is high. This is because `SyncingEngine` is notified of each inbound substream which it then can either accept or reject and this causes a lot of message exchange on the already busy channel. Use a direct channel pair between `Protocol` and `SyncingEngine` to exchange notification events. It is a temporary change to alleviate the problems caused by syncing being an independent protocol and the fix will be removed once `NotificationService` is implemented. * Apply review comments * fixes * trigger ci * Fix tests Verify that both peers have a connection now that the validation goes through `SyncingEngine`. Depending on how the tasks are scheduled, one of them might not have the peer registered in `SyncingEngine` at which point the test won't make any progress because block announcement received from an unknown peer is discarded. Move polling of `ChainSync` at the end of the function so that if a block announcement causes a block request to be sent, that can be sent in the same call to `SyncingEngine::poll()`. --------- Co-authored-by: parity-processbot <>
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