feat: adding circuit relaying

Author: dryajov

src/index.js

@@ -14,6 +14,7 @@ const PeerInfo = require('peer-info')
 const PeerBook = require('peer-book')
 const mafmt = require('mafmt')
 const multiaddr = require('multiaddr')
+const Circuit = require('libp2p-circuit')
 
 exports = module.exports
 
@@ -29,6 +30,7 @@ class Node extends EventEmitter {
     this.peerInfo = _peerInfo
     this.peerBook = _peerBook || new PeerBook()
     this.isOnline = false
+    this.relayCircuit = null
 
     this.swarm = new Swarm(this.peerInfo, this.peerBook)
 
@@ -41,6 +43,24 @@ class Node extends EventEmitter {
       // If muxer exists, we can use Identify
       this.swarm.connection.reuse()
 
+      // enable circuit relaying
+      // TODO: move defaults elsewhere
+      _options.Relay = Object.assign({
+        Circuit: {
+          Enabled: false,
+          Active: false
+        },
+        DialMode: 'onion'
+      }, _options.Relay)
+
+      if (_options.Relay.Circuit.Enabled) {
+        this.relayCircuit = new Circuit.Relay(_options.Relay.Circuit)
+        this.relayCircuit.mount(this.swarm)
+      }
+
+      // If muxer exists, we can use Relay for listening/dialing
+      this.swarm.connection.relay(_options.Relay)
+
       // Received incommind dial and muxer upgrade happened,
       // reuse this muxed connection
       this.swarm.on('peer-mux-established', (peerInfo) => {