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core/muxing: Redesign StreamMuxer trait #2648

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wants to merge 7 commits into from
Closed

core/muxing: Redesign StreamMuxer trait #2648

wants to merge 7 commits into from

Commits on Jun 15, 2022

  1. Fix StreamMuxer::Error to io::Error 

    We are already enforcing that the associated type must convert to
`io::Error`. We might as well just make all functions return an
`io::Error` directly.
    @thomaseizinger
    thomaseizinger committed Jun 15, 2022
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  2. Add newline before return value 

    Visually separating this makes it easier to read.
    @thomaseizinger
    thomaseizinger committed Jun 15, 2022
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  3. Re-design the StreamMuxer trait 

    The current `StreamMuxer` API is based around a poll-based approach
where each substream needs to be passed by value to read/write/close
it.

The muxer itself however is not available in the end-user abstractions
like `ConnectionHandler`. To circumvent this, the `StreamMuxerBox`
type exists which allows a `StreamMuxer` to be cloned. Together with
`SubstreamRef`, this allows each substream to own a reference to the
muxer it was created with and pass itself to the muxer within
implementations of `AsyncRead` and `AsyncWrite`. These implementations
are convenient as they allow an end-user to simply read and write to
the substream without holding a reference to anything else.

We can achieve the same goal by changing the `StreamMuxerBox` abstraction
to use a `SubstreamBox`. Users of `libp2p-core` can continue to
depend on the `Substream` associated type of `StreamMuxer`.
    @thomaseizinger
    thomaseizinger committed Jun 15, 2022
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  4. fixup! Re-design the StreamMuxer trait 

    Reduce diff.
    @thomaseizinger
    thomaseizinger committed Jun 15, 2022
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  5. fixup! Re-design the StreamMuxer trait 

    Reduce diff.
    @thomaseizinger
    thomaseizinger committed Jun 15, 2022
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  6. fixup! Re-design the StreamMuxer trait 

    Fix compile errors.
    @thomaseizinger
    thomaseizinger committed Jun 15, 2022
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  7. fixup! Re-design the StreamMuxer trait 

    Fix docs error.
    @thomaseizinger
    thomaseizinger committed Jun 15, 2022
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