feat(events): Support of paused client event (webtorrent#411)

* feat: Added `paused` client event

* fix(events): fixed 'invalid event' response on 'paused' request from client

* fix(styles): fixed extra semicolon

Author: pavloniym

lib/common-node.js

@@ -11,18 +11,20 @@ exports.REMOVE_IPV4_MAPPED_IPV6_RE = /^::ffff:/
 
 exports.CONNECTION_ID = Buffer.concat([toUInt32(0x417), toUInt32(0x27101980)])
 exports.ACTIONS = { CONNECT: 0, ANNOUNCE: 1, SCRAPE: 2, ERROR: 3 }
-exports.EVENTS = { update: 0, completed: 1, started: 2, stopped: 3 }
+exports.EVENTS = { update: 0, completed: 1, started: 2, stopped: 3, paused: 4 }
 exports.EVENT_IDS = {
   0: 'update',
   1: 'completed',
   2: 'started',
-  3: 'stopped'
+  3: 'stopped',
+  4: 'paused'
 }
 exports.EVENT_NAMES = {
   update: 'update',
   completed: 'complete',
   started: 'start',
-  stopped: 'stop'
+  stopped: 'stop',
+  paused: 'pause'
 }
 
 /**

lib/server/swarm.js

@@ -47,6 +47,8 @@ class Swarm {
       self._onAnnounceCompleted(params, peer, id)
     } else if (params.event === 'update') {
       self._onAnnounceUpdate(params, peer, id)
+    } else if (params.event === 'paused') {
+      self._onAnnouncePaused(params, peer, id)
     } else {
       cb(new Error('invalid event'))
       return
@@ -132,6 +134,15 @@ class Swarm {
     this.peers.set(id, peer)
   }
 
+  _onAnnouncePaused (params, peer, id) {
+    if (!peer) {
+      debug('unexpected `paused` event from peer that is not in swarm')
+      return this._onAnnounceStarted(params, peer, id) // treat as a start
+    }
+
+    this._onAnnounceUpdate(params, peer, id)
+  }
+
   _getPeers (numwant, ownPeerId, isWebRTC) {
     const peers = []
     const ite = randomIterate(this.peers.keys)