Solving the Stream Muxer interoperability between Go and JS implementations

[daviddias]

I'm creating this issue to keep track of all the work that has been put towards this endeavour, as it is becoming harder to have a clear picture of what is left.

• Available Stream Muxers
  • js-libp2p-multiplex
  • js-libp2p-spdy
  • spdystream (Go) - equivalent to js-libp2p-spdy
  • yamux (Go)
  • muxado (Go)
  • go-multiplex (Go) - equivalent to js-libp2p-multiplex

With https://github.com/libp2p/interface-stream-muxer, we got a standard interface for Stream Multiplex and with it, a very comprehensive battery of tests, which can be found:

• JS - https://github.com/libp2p/interface-stream-muxer/tree/master/src
• Go - https://github.com/jbenet/go-stream-muxer/blob/master/test/ttest.go

The following table presents the current state of each multiplex:

Module	interface tests	stress tests	mega stress test	interop
js-libp2p-spdy	✔️	✔️	✔️	𝙓
js-libp2p-multiplex	✔️	✔️	✔️	𝙓
spdystream	✔️	??	??	𝙓
yamux	✔️	✔️	✔️	N/A
muxado	✔️	??	??	N/A
go-multiplex	✔️	??	??	𝙓

Threads with information about this issue:

• Interop Tests available in js-ipfs repo test(interop): add more sizes, get that multiplexing thing done #715
• SPDY diagnostics go-libp2p-spdy has problems - Can not send objects to go, if they are larger than 64k libp2p/js-libp2p-spdy#48
• @victorbjelkholm TODO https://hackmd.io/CwJghgrBzGC0A2ApgTgMx2ARhUuLgl4BjCAIwQQgBMAzLWiYoA==#

[daviddias]

@victorbjelkholm how is the state of testing? Have we confirmed that go-multiplex actually passes all the tests like yamux?

What about the tests just between js-libp2p-ipfs-node.js and go-libp2p, do those show any interesting behaviour?

[victorb]

@diasdavid

@victorbjelkholm how is the state of testing? Have we confirmed that go-multiplex actually passes all the tests like yamux?

I cannot confirm that either go-multiplex or yamux is passing the tests since I cannot run them. Wrote a comment about this here: libp2p/go-stream-muxer#10 (comment)

Gonna skip muxando for now.

What about the tests just between js-libp2p-ipfs-node.js and go-libp2p, do those show any interesting behaviour?

So, with spdy everything is fine and seemingly working, when testing the echo example, however, when using multiplex, libp2p-nodejs fails with:

/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/pull-pair/index.js:11
      throw new Error('already piped')
      ^

Error: already piped
    at sink (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/pull-pair/index.js:11:13)
    at Connection.consume (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/pull-defer/sink.js:7:17)
    at pull (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/pull-stream/pull.js:43:9)
    at Dialer.handle (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/multistream-select/src/dialer/index.js:47:5)
    at protocolHandshake (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/libp2p-swarm/src/dial.js:183:10)
    at attemptMuxerUpgrade (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/libp2p-swarm/src/dial.js:60:11)
    at ms.select (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/libp2p-swarm/src/dial.js:147:17)
    at f (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/once/once.js:25:25)
    at select (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/multistream-select/src/dialer/index.js:76:16)
    at pullLP.decodeFromReader (/Users/user/projects/ipfs/js-libp2p-ipfs-nodejs/node_modules/multistream-select/src/select.js:25:14)

I'm now on a OS where I can reproduce the test-failures we saw with libp2p-swarm and libp2p-nodejs when multiplex is activated, so gonna look into and see if I can figure out why.

[daviddias]

Started a 'how to repro' issue to help everyone debug here: https://github.com/ipfs/js-libp2p-ipfs-nodejs/issues/59

[daviddias]

ipfs/in-web-browsers#19 (comment)

[jackkleeman]

Any news on the status of this in browsers? I have no issues from node in spdy, but in browser both spdy and multiplex (after enabling multiplex on the go listener) fails during the handshake, after selecting /spdy/3.1.0 or selecting /mplex/6.7.0. Well, it doesn't fail with an error, it just stalls.

[dignifiedquire]

The version on master is fully interoperable with go-ipfs@0.4.6-rc1 using multiplex on node.js. I am still working through testing multiplex in the browser.