refactor: examples transports (#503)

* refactor: examples-transports

* chore: apply suggestions from code review

Co-Authored-By: Jacob Heun <jacobheun@gmail.com>

* chore: address review

* chore: address review

Co-authored-by: Jacob Heun <jacobheun@gmail.com>

examples/transports/2.js

@@ -1,39 +1,31 @@
 /* eslint-disable no-console */
 'use strict'
 
-const libp2p = require('../../')
+const Libp2p = require('../..')
 const TCP = require('libp2p-tcp')
+const SECIO = require('libp2p-secio')
+const MPLEX = require('libp2p-mplex')
 const PeerInfo = require('peer-info')
-const waterfall = require('async/waterfall')
-const defaultsDeep = require('@nodeutils/defaults-deep')
-const parallel = require('async/parallel')
-const pull = require('pull-stream')
 
-class MyBundle extends libp2p {
-  constructor (_options) {
-    const defaults = {
-      modules: {
-        transport: [
-          TCP
-        ]
-      }
+const pipe = require('it-pipe')
+const concat = require('it-concat')
+
+const createNode = async (peerInfo) => {
+  // To signall the addresses we want to be available, we use
+  // the multiaddr format, a self describable address
+  peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
+
+  const node = await Libp2p.create({
+    peerInfo,
+    modules: {
+      transport: [TCP],
+      connEncryption: [SECIO],
+      streamMuxer: [MPLEX]
     }
+  })
 
-    super(defaultsDeep(_options, defaults))
-  }
-}
-
-function createNode (callback) {
-  let node
-
-  waterfall([
-    (cb) => PeerInfo.create(cb),
-    (peerInfo, cb) => {
-      peerInfo.multiaddrs.add('/ip4/0.0.0.0/tcp/0')
-      node = new MyBundle({ peerInfo: peerInfo })
-      node.start(cb)
-    }
-  ], (err) => callback(err, node))
+  await node.start()
+  return node
 }
 
 function printAddrs (node, number) {
@@ -41,29 +33,31 @@ function printAddrs (node, number) {
   node.peerInfo.multiaddrs.forEach((ma) => console.log(ma.toString()))
 }
 
-parallel([
-  (cb) => createNode(cb),
-  (cb) => createNode(cb)
-], (err, nodes) => {
-  if (err) { throw err }
-
-  const node1 = nodes[0]
-  const node2 = nodes[1]
+;(async () => {
+  const [peerInfo1, peerInfo2] = await Promise.all([
+    PeerInfo.create(),
+    PeerInfo.create()
+  ])
+  const [node1, node2] = await Promise.all([
+    createNode(peerInfo1),
+    createNode(peerInfo2)
+  ])
 
   printAddrs(node1, '1')
   printAddrs(node2, '2')
 
-  node2.handle('/print', (protocol, conn) => {
-    pull(
-      conn,
-      pull.map((v) => v.toString()),
-      pull.log()
+  node2.handle('/print', async ({ stream }) => {
+    const result = await pipe(
+      stream,
+      concat
     )
+    console.log(result.toString())
   })
 
-  node1.dialProtocol(node2.peerInfo, '/print', (err, conn) => {
-    if (err) { throw err }
+  const { stream } = await node1.dialProtocol(node2.peerInfo, '/print')
 
-    pull(pull.values(['Hello', ' ', 'p2p', ' ', 'world', '!']), conn)
-  })
-})
+  await pipe(
+    ['Hello', ' ', 'p2p', ' ', 'world', '!'],
+    stream
+  )
+})();