Switch to protocol buffers for communication.

lib/wire/channelmanager.js

@@ -0,0 +1,51 @@
+var events = require('events')
+var util = require('util')
+
+function ChannelManager() {
+  events.EventEmitter.call(this)
+  this.channels = Object.create(null)
+}
+
+util.inherits(ChannelManager, events.EventEmitter)
+
+ChannelManager.prototype.register = function(id, timeout) {
+  this.channels[id] = {
+    timeout: timeout
+  , lastActivity: Date.now()
+  , timer: null
+  }
+
+  // Set timer with initial check
+  this.check(id)
+}
+
+ChannelManager.prototype.unregister = function(id) {
+  var channel = this.channels[id]
+  delete this.channels[id]
+  clearInterval(channel.timer)
+}
+
+ChannelManager.prototype.keepalive = function(id) {
+  var channel = this.channels[id]
+  if (channel) {
+    channel.lastActivity = Date.now()
+  }
+}
+
+ChannelManager.prototype.check = function(id) {
+  var channel = this.channels[id]
+    , inactivePeriod = Date.now() - channel.lastActivity
+
+  if (inactivePeriod >= channel.timeout) {
+    this.unregister(id)
+    this.emit('timeout', id)
+  }
+  else if (channel.timeout < Infinity) {
+    channel.timer = setTimeout(
+      this.check.bind(this, id)
+    , channel.timeout - inactivePeriod
+    )
+  }
+}
+
+module.exports = ChannelManager