在事件侦听器回调中未调用Restify res.send（）

Question

我正在使用restify 2.8.4，nodejs 0.10.36和IBM MQ Light消息传递。

这是一种RPC模式，每当接收方准备好结果时，它将发出一个事件，而在以下条件下，重新调整POST路由将捕获该事件和数据，并使用res.send ()回复。

问题是，不会触发res.send () 。 而且我不明白为什么未触发res.send () 。 此POST路由中只有一个res.send () 。

尝试过res.write ()和res.end () 。 一样。 未触发。

任何建议深表感谢。

route.js

server.post ('/user', function (req, res, next) {
  var body = req.body;

  var recvClient = createRecv ();

  var sendClient = createSend (body);

  recvClient.on ("receiver:got:it", function () {
    // receiver has confirmed received message
    // so sender client can be released 
    console.log ('stopping send client...'.info);
    sendClient.stop ();
  });

  recvClient.on ("receiver:replied", function (data) {
    // event callback was triggered
    console.log ('receiver replied captured...');

    res.send ();
    return next ();
  });

});

receiver.js

recvClient.on('started', function() {
    recvClient.subscribe(topicPattern, {qos: 1, autoConfirm: false, credit: 1});

    recvClient.on('message', function(data, delivery) {
      console.log('Recv: ' + util.inspect (data, false, null));

      delivery.message.confirmDelivery (function () {
        recvClient.emit ('receiver:got:it'); 
      });

      var user = new User (data);     
      user.create ()           
      .then (function (user) { 
        recvClient.emit ('receiver:replied', user);
    }, function (err) {      
        recvClient.emit ('receiver:replied', {err: err.message});
    })
      .finally (function (){   
        console.log ('stopping receiver client...');
        recvClient.stop ();    
      });

    });
  });

输出轨迹

body: {}  //stuff here
Recv: {}  // receiver received body stuff
stopping send client...
// do work

receiver replied captured...
stopping receiver client...

更新1

如果我将事件发射器替换为接收器中的另一个发送/接收消息队列，则会调用res.send () 。

这种方法比事件发射器更混乱。 我仍然拒绝相信事件发射器为何不起作用。

var rpcReceive = new RpcReceive ("user.create.replied", {qos:1, autoConfirm: false, credit: 1});

rpcReceive.receive (recvClient)
.then (function (user){
  res.send (user);
  return next ();
})
.then (undefined, function (err){
  return next (new restify.errors.BadRequestError (err.message));
});

Answer 1

该问题看起来像是route.js的结构。 实际上，recvClient.on事件不应依赖于server.post（'/ user'）。 正确的结构应为：

var recvClient = createRecv ();     // should be global object

server.post ('/user', function (req, res, next) {
  var body = req.body;

  //var recvClient = createRecv ();     //commented out this code as this is moved out of this API.

  //var sendClient = createSend (body); //commented out this code. May be this wont be required.

});

recvClient.on ("receiver:got:it", function () {
    // receiver has confirmed received message
    // so sender client can be released 
    console.log ('stopping send client...'.info);
    //sendClient.stop ();       //commented out this code. May be this wont be required.
});

recvClient.on ("receiver:replied", function (data) {
    // event callback was triggered
    console.log ('receiver replied captured...');

    //res.send ();              
    //return next ();       

    /*commented out these two lines. Instead of sending response like this, emit some event from here, which can be consumed on receiver.js. Use something like below code to send response to receiver.js */
    recvClient.emit('sending:response', "response");
});

而且您的receive.js应该具有以下逻辑（除了代码之外），以接收来自route.js的响应。

recvClient.on('sending:response', function(response) {
    // do processing on response
});

请尝试此操作，如果发现问题，请回复。 我已经在创建聊天应用程序时使用类似的逻辑来发出和使用事件。 如果您仍然遇到问题，请告诉我。

Answer 2

您可以尝试使用res.json（{'status'：200}）吗？