docs(examples): PubSub 1 and 2 (#103)

examples/pubsub/1.js

@@ -0,0 +1,68 @@
+'use strict'
+
+const libp2p = require('libp2p')
+const TCP = require('libp2p-tcp')
+const Multiplex = require('libp2p-multiplex')
+const SECIO = require('libp2p-secio')
+const PeerInfo = require('peer-info')
+const MulticastDNS = require('libp2p-mdns')
+const FloodSub = require('libp2p-floodsub')
+const waterfall = require('async/waterfall')
+const parallel = require('async/parallel')
+const series = require('async/series')
+
+class MyBundle extends libp2p {
+  constructor (peerInfo) {
+    const modules = {
+      transport: [new TCP()],
+      connection: {
+        muxer: [Multiplex],
+        crypto: [SECIO]
+      },
+      discovery: [new MulticastDNS(peerInfo, { interval: 2000 })]
+    }
+    super(modules, peerInfo)
+  }
+}
+
+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)
+      node.start(cb)
+    }
+  ], (err) => callback(err, node))
+}
+
+parallel([
+  (cb) => createNode(cb),
+  (cb) => createNode(cb)
+], (err, nodes) => {
+  if (err) { throw err }
+
+  const node1 = nodes[0]
+  const node2 = nodes[1]
+
+  const fs1 = new FloodSub(node1)
+  const fs2 = new FloodSub(node2)
+
+  series([
+    (cb) => fs1.start(cb),
+    (cb) => fs2.start(cb),
+    (cb) => node1.once('peer:discovery', (peer) => node1.dial(peer, cb)),
+    (cb) => setTimeout(cb, 500)
+  ], (err) => {
+    if (err) { throw err }
+
+    fs2.on('news', (msg) => console.log(msg.from, msg.data.toString()))
+    fs2.subscribe('news')
+
+    setInterval(() => {
+      fs1.publish('news', Buffer.from('Bird bird bird, bird is the word!'))
+    }, 1000)
+  })
+})