muxers: Add test harness for StreamMuxer implementations
#2952
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This is now covered by the compliance test suite.
This ensures we cover the same things as the original mplex tests.
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Very much in favor of this change. Thanks @thomaseizinger for the excellent design.
| /// Verifies that the dialer of a substream can receive a message. | ||
| pub async fn dialer_can_receive<A, B, S, E>(alice: A, bob: B) | ||
| where | ||
| A: StreamMuxer<Substream = S, Error = E> + Unpin, | ||
| B: StreamMuxer<Substream = S, Error = E> + Unpin, | ||
| S: AsyncRead + AsyncWrite + Send + Unpin + 'static, | ||
| E: fmt::Debug, | ||
| { | ||
| run_commutative( | ||
| alice, | ||
| bob, | ||
| |mut stream| async move { | ||
| let mut buf = Vec::new(); | ||
| stream.read_to_end(&mut buf).await.unwrap(); | ||
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| assert_eq!(buf, b"PING"); | ||
| }, | ||
| |mut stream| async move { | ||
| stream.write_all(b"PING").await.unwrap(); | ||
| stream.close().await.unwrap(); | ||
| }, | ||
| ) | ||
| .await; | ||
| } |
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This is the official winner in the competition of most-concise-test-case within the rust-libp2p repository!
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When it comes to tests, every character of noise counts. You don't want to read details that are not important :)
I'd like to get rid of the trait bounds put I don't think it is possible.
| } | ||
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| #[async_std::test] | ||
| #[ignore] // Hangs forever, is this a harness bug? It passes if we try to write to the stream. |
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May it be the case that the Rust yamux implementation only announces the stream to the remote once it writes the first byte onto it?
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Could be yeah.
Because of multistream-select, we will always write something but it is still a bit odd.
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I managed to adapt the mplex implementation so I got the reset test case to pass. Going to work on yamux next. |
thomaseizinger
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We should probably extract that into a separate PR. It might break something and that will make bisecting easier. |
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Given that both our muxers, We can then fix the muxer implementations in a separate PR! |
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Removed the mplex changes as per comment above and chat with @mxinden out-of-band. This is ready for another review :) |
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Merging because semver checks are a false-positive error. |
Description
This adds a basic test harness for stream muxers. It covers everything that was covered by the old mplex tests but additionally runs them also for yamux.
yamux doesn't pass one of them. I don't understand yet whether it is a harness bug or an actual bug in yamux. In any case, this is a strict improvement over what we currently have so I would like to not block this PR on that. The harness will be used to make progress on the WebRTC implementation. See melekes#9 (comment).
As part of writing this harness, I realised that
StreamMuxerExt::next_{inbound,outbound}were a bad idea because they don't uphold theStreamMuxercontract of callingStreamMuxer::pollso I went ahead and deprecated them.cc @melekes
Links to any relevant issues
Open Questions
Open tasks
StreamMuxerExtfunctions into separate PR: core/muxer: DeprecateStreamMuxerExt::next_{inbound,outbound}#3002write_to_remote_closedtestAdd test for resetting stream on dropChange checklist