refactor: add js-libp2p-switch to the libp2p codebase (#388)

Co-authored-by: Alan Shaw <alan.shaw@protocol.ai>
Co-authored-by: Alan Shaw <alan@tableflip.io>
Co-authored-by: Arnaud <arnaud.valensi@gmail.com>
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Co-authored-by: Hugo Dias <hugomrdias@gmail.com>
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Co-authored-by: kumavis <kumavis@users.noreply.github.com>
Co-authored-by: ᴠɪᴄᴛᴏʀ ʙᴊᴇʟᴋʜᴏʟᴍ <victorbjelkholm@gmail.com>

test/switch/swarm-muxing+webrtc-star.browser.js

@@ -0,0 +1,153 @@
+/* eslint-env mocha */
+'use strict'
+
+const chai = require('chai')
+const dirtyChai = require('dirty-chai')
+const expect = chai.expect
+chai.use(dirtyChai)
+
+const peerId = require('peer-id')
+const PeerInfo = require('peer-info')
+const WebRTCStar = require('libp2p-webrtc-star')
+const spdy = require('libp2p-spdy')
+const parallel = require('async/parallel')
+const series = require('async/series')
+const pull = require('pull-stream')
+const PeerBook = require('peer-book')
+const tryEcho = require('./utils').tryEcho
+const sinon = require('sinon')
+
+const Switch = require('libp2p-switch')
+
+describe('Switch (webrtc-star)', () => {
+  let switch1
+  let peer1
+  let wstar1
+
+  let switch2
+  let peer2
+  let wstar2
+
+  before((done) => series([
+    (cb) => peerId.create((err, id1) => {
+      expect(err).to.not.exist()
+      peer1 = new PeerInfo(id1)
+      const ma1 = '/ip4/127.0.0.1/tcp/15555/ws/p2p-webrtc-star/ipfs/' +
+        id1.toB58String()
+      peer1.multiaddrs.add(ma1)
+      cb()
+    }),
+    (cb) => peerId.create((err, id2) => {
+      expect(err).to.not.exist()
+      peer2 = new PeerInfo(id2)
+      const ma2 = '/ip4/127.0.0.1/tcp/15555/ws/p2p-webrtc-star/ipfs/' +
+        id2.toB58String()
+      peer2.multiaddrs.add(ma2)
+      cb()
+    })
+  ], (err) => {
+    expect(err).to.not.exist()
+
+    switch1 = new Switch(peer1, new PeerBook())
+    switch2 = new Switch(peer2, new PeerBook())
+    done()
+  }))
+
+  afterEach(() => {
+    sinon.restore()
+  })
+
+  it('add WebRTCStar transport to switch 1', () => {
+    wstar1 = new WebRTCStar()
+    switch1.transport.add('wstar', wstar1)
+    expect(Object.keys(switch1.transports).length).to.equal(1)
+  })
+
+  it('add WebRTCStar transport to switch 2', () => {
+    wstar2 = new WebRTCStar()
+    switch2.transport.add('wstar', wstar2)
+    expect(Object.keys(switch2.transports).length).to.equal(1)
+  })
+
+  it('listen on switch 1', (done) => {
+    switch1.start(done)
+  })
+
+  it('listen on switch 2', (done) => {
+    switch2.start(done)
+  })
+
+  it('add spdy', () => {
+    switch1.connection.addStreamMuxer(spdy)
+    switch1.connection.reuse()
+    switch2.connection.addStreamMuxer(spdy)
+    switch2.connection.reuse()
+  })
+
+  it('handle proto', () => {
+    switch2.handle('/echo/1.0.0', (protocol, conn) => pull(conn, conn))
+  })
+
+  it('dial on proto', (done) => {
+    switch1.dial(peer2, '/echo/1.0.0', (err, conn) => {
+      expect(err).to.not.exist()
+      expect(switch1.connection.getAll()).to.have.length(1)
+
+      tryEcho(conn, () => {
+        expect(switch2.connection.getAll()).to.have.length(1)
+        done()
+      })
+    })
+  })
+
+  it('create a third node and check that discovery works', function (done) {
+    this.timeout(20 * 1000)
+
+    let counter = 0
+
+    let switch3
+
+    function check () {
+      if (++counter === 4) {
+        const s1n = switch1.connection.getAll()
+        const s2n = switch2.connection.getAll()
+        const s3n = switch3.connection.getAll()
+        expect(s1n).to.have.length(2)
+        expect(s2n).to.have.length(2)
+        expect(s3n).to.have.length(2)
+        switch3.stop(done)
+      }
+      if (counter === 3) {
+        setTimeout(check, 2000)
+      }
+    }
+
+    wstar1.discovery.on('peer', (peerInfo) => switch1.dial(peerInfo, check))
+    wstar2.discovery.on('peer', (peerInfo) => switch2.dial(peerInfo, check))
+    sinon.stub(wstar1.discovery, '_isStarted').value(true)
+    sinon.stub(wstar2.discovery, '_isStarted').value(true)
+
+    peerId.create((err, id3) => {
+      expect(err).to.not.exist()
+
+      const peer3 = new PeerInfo(id3)
+      const mh3 = '/ip4/127.0.0.1/tcp/15555/ws/p2p-webrtc-star/ipfs/' + id3.toB58String()
+      peer3.multiaddrs.add(mh3)
+
+      switch3 = new Switch(peer3, new PeerBook())
+      const wstar3 = new WebRTCStar()
+      sinon.stub(wstar3.discovery, '_isStarted').value(true)
+      switch3.transport.add('wstar', wstar3)
+      switch3.connection.addStreamMuxer(spdy)
+      switch3.connection.reuse()
+      switch3.start(check)
+    })
+  })
+
+  it('stop', (done) => {
+    parallel([
+      (cb) => switch1.stop(cb),
+      (cb) => switch2.stop(cb)
+    ], done)
+  })
+})