feat(relay): propagate errors to Transport::{listen_on,dial}
#4745
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thomaseizinger
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Oct 27, 2023
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This was referenced Oct 27, 2023
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This pull request has merge conflicts. Could you please resolve them @thomaseizinger? 🙏 |
Co-authored-by: Max Inden <[email protected]>
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This PR implements the long-awaited design of disallowing `ConnectionHandler`s to close entire connections. Instead, users should close connections via `ToSwarm::CloseConnection` from a `NetworkBehaviour` or - even better - from the `Swarm` via `close_connection`. A `NetworkBehaviour` also does not have a "full" view onto how a connection is used but at least it can correlate whether it created the connection via the `ConnectionId`. In general, the more modular and friendly approach is to stop "using" a connection if a particular protocol no longer needs it. As a result of the keep-alive algorithm, such a connection is then closed automatically. Depends-on: #4745. Depends-on: #4718. Depends-on: #4749. Related: #3353. Related: #4714. Resolves: #3591. Pull-Request: #4755.
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Description
To make a reservation with a relay, a user calls
Swarm::listen_onwith an address of the relay, suffixed with a/p2pcircuitprotocol. Similarly, to establish a circuit to another peer, a user needs to callSwarm::dialwith such an address. Upon success, theSwarmthen issues aSwarmEvent::NewListenAddrevent in case of a successful reservation or aSwarmEvent::ConnectionEstablishedin case of a successful connect.The story is different for errors. Somewhat counterintuitively, the actual reason of an error during these operations are only reported as
relay::Events without a direct correlation to the user'sSwarm::listen_onorSwarm::dialcalls.With this PR, we send these errors back "into" the
Transportand report them asSwarmEvent::ListenerClosedorSwarmEvent::OutgoingConnectionError. This is conceptually more correct. Additionally, by sending these errors back to the transport, we no longer useConnectionHandlerEvent::Closewhich entirely closes the underlying relay connection. In case the connection is not used for something else, it will be closed by the keep-alive algorithm.Resolves: #4717.
Related: #3591.
Related: #4718.
Notes & open questions
Change checklist