fix: promisified methods (#398)

* chore: update ws rendezvous dep

test(fix): fix tests with latest ws rendezvous server

* fix: promisification of libp2p methods

test: add tests to verify promisify support until async/await endeavor is complete

* chore: fix linting

test/promisify.node.js

@@ -0,0 +1,87 @@
+/* eslint-env mocha */
+'use strict'
+
+/**
+ * This test suite is intended to validate compatability of
+ * the promisified api, until libp2p has been fully migrated to
+ * async/await. Once the migration is complete and all tests
+ * are using async/await, this file can be removed.
+ */
+
+const chai = require('chai')
+chai.use(require('dirty-chai'))
+const expect = chai.expect
+const promisify = require('promisify-es6')
+const createNode = promisify(require('./utils/create-node'))
+const { createPeerInfo } = require('./utils/create-node')
+const Node = require('./utils/bundle-nodejs')
+const pull = require('pull-stream')
+const Ping = require('libp2p-ping')
+
+/**
+ * As libp2p is currently promisified, when extending libp2p,
+ * method arguments must be passed to `super` to ensure the
+ * promisify callbacks are properly resolved
+ */
+class AsyncLibp2p extends Node {
+  async start (...args) {
+    await super.start(...args)
+  }
+
+  async stop (...args) {
+    await super.start(...args)
+  }
+}
+
+async function createAsyncNode () {
+  const peerInfo = await promisify(createPeerInfo)()
+  peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
+  return new AsyncLibp2p({ peerInfo })
+}
+
+describe('promisified libp2p', () => {
+  let libp2p
+  let otherNode
+  const ECHO_PROTO = '/echo/1.0.0'
+
+  before('Create and Start', async () => {
+    [libp2p, otherNode] = await Promise.all([
+      createNode('/ip4/0.0.0.0/tcp/0'),
+      createAsyncNode()
+    ])
+
+    return [libp2p, otherNode].map(node => {
+      node.handle(ECHO_PROTO, (_, conn) => pull(conn, conn))
+      return node.start()
+    })
+  })
+
+  after('Stop', () => {
+    return [libp2p, otherNode].map(node => node.stop())
+  })
+
+  afterEach('Hang up', () => {
+    return libp2p.hangUp(otherNode.peerInfo)
+  })
+
+  it('dial', async () => {
+    const stream = await libp2p.dial(otherNode.peerInfo)
+    expect(stream).to.not.exist()
+    expect(libp2p._switch.connection.getAll()).to.have.length(1)
+  })
+
+  it('dialFSM', async () => {
+    const connectionFSM = await libp2p.dialFSM(otherNode.peerInfo, ECHO_PROTO)
+    expect(connectionFSM).to.exist()
+  })
+
+  it('dialProtocol', async () => {
+    const stream = await libp2p.dialProtocol(otherNode.peerInfo, ECHO_PROTO)
+    expect(stream).to.exist()
+  })
+
+  it('ping', async () => {
+    const ping = await libp2p.ping(otherNode.peerInfo)
+    expect(ping).to.be.an.instanceOf(Ping)
+  })
+})