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feat: report changes in supported protocols to ConnectionHandler

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With this patch, implementations of `ConnectionHandler` (which are typically composed in a tree) can exchange information about the supported protocols of a remote with each other via `ConnectionHandlerEvent::ReportRemoteProtocols`. The provided `ProtocolSupport` enum can describe either additions or removals of the remote peer's protocols.

This information is aggregated in the connection and passed down to the `ConnectionHandler` via `ConnectionEvent::RemoteProtocolsChange`.

Similarly, if the listen protocols of a connection change, all `ConnectionHandler`s on the connection will be notified via `ConnectionEvent::LocalProtocolsChange`. This will allow us to eventually remove `PollParameters` from `NetworkBehaviour`.

This pattern allows protocols on a connection to communicate with each other. For example, protocols like identify can share the list of (supposedly) supported protocols by the remote with all other handlers. A protocol like kademlia can accurately add and remove a remote from its routing table as a result.

Resolves: #2680.
Related: #3124.

Pull-Request: #3651.
This commit is contained in:
Thomas Eizinger
2023-05-08 16:36:30 +02:00
committed by GitHub
parent b8a7684153
commit b035fc80a0
30 changed files with 844 additions and 243 deletions
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4
protocols/request-response/src/handler.rs
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@ -382,7 +382,9 @@ where
ConnectionEvent::ListenUpgradeError(listen_upgrade_error) => {
self.on_listen_upgrade_error(listen_upgrade_error)
}
ConnectionEvent::AddressChange(_) => {}
ConnectionEvent::AddressChange(_)
| ConnectionEvent::LocalProtocolsChange(_)
| ConnectionEvent::RemoteProtocolsChange(_) => {}
}
}
}