心跳上的Socket.io事件

Question

Socket.IO uses heartbeat pattern to be sure that a client is still connected. It would solve my algorithm if I would be able to subscribe to the hearbeat event on server.

for instance: socket.on "heartbeat", -> mycode

any idea if this is possible?

Answer 1

The heartbeat happens very frequently, are you sure that's the right thing? I use the "connect" event, that seems like it might do what you need:

  connect: (url, options, connectCallback) =>
    someFunction = =>
      @doSomeRedisStuff() if @connected

    @logger.debug "starting connection to url: #{url}"
    @socket = @socket.connect(url, options)
    @logger.debug "connecting ..."
    @socket.on "connect", =>    
      @logger.info "connected (socket id #{(@socket.socket.sessionid)})"
      @connected = true 
      setTimeout someFunction, 2000
      connectCallback() if connectCallback?
     @socket.on "disconnect", =>
       @connected = false 

If the connection to the server is interrupted (eg the server is restarted) the connect event will kick off when the connection comes back. Socket.IO is smart about this.