WARNING Error: Meteor code must always run within a Fiber when call method on server

Question

I'm trying to deploy my meteor app onto the server but it always has this error on my meteor server log

Fri Jun 21 2013 11:39:31 GMT+0000 (UTC)] INFO HIT /img/bg.png
183.90.41.21 [Fri Jun 21 2013 11:39:32 GMT+0000 (UTC)] INFO HIT /favicon.ico 183.90.41.21 [Fri Jun 21 2013 11:39:41 GMT+0000 (UTC)] INFO HIT /form 183.90.41.21 [Fri Jun 21 2013 11:39:42 GMT+0000 (UTC)] INFO HIT /favicon.ico 183.90.41.21 [Fri Jun 21 2013 11:39:49 GMT+0000 (UTC)] WARNING           }).run();
             ^ [Fri Jun 21 2013 11:39:49 GMT+0000 (UTC)] WARNING app/server/server.js:53 [Fri Jun 21 2013 11:39:49 GMT+0000 (UTC)] WARNING Error: Meteor code must always run within a Fiber
    at _.extend.get (app/packages/meteor/dynamics_nodejs.js:14:13)
    at _.extend.apply (app/packages/livedata/livedata_server.js:1268:57)
    at _.extend.call (app/packages/livedata/livedata_server.js:1229:17)
    at Meteor.startup.Meteor.methods.streamTwit (app/server/server.js:51:22)

but I have already wrapped it within Fiber and it works well locally. I really do not know what could be the problem. Appreciate if anyone can help.

//server.js

Meteor.startup(function () {
    var require = Npm.require;
    var fs = require('fs');
    var path = require('path');
    var base = path.resolve('.');
    var isBundle = fs.existsSync(base + '/bundle');
    var modulePath = base + (isBundle ? '/bundle/static' : '/public') + '/node_modules';

    var ntwitter = require(modulePath + '/ntwitter');
    var Fiber = require(modulePath + '/fibers');

    var twit = new ntwitter({
      consumer_key: 'my key',
      consumer_secret: 'my key',
      access_token_key: 'my key',
      access_token_secret: 'my key'
    });

  Meteor.methods({
      postText : function(questionText){
        twit.verifyCredentials(function (err, data) {
        if (err) {
          console.log("Error verifying credentials: " + err);
          process.exit(1);
        }
      }).updateStatus(questionText,
        function (err, data) {
          if (err) {
            console.log('Tweeting failed: ' + err);
            return false;
          }
          else {
            console.log('Success!');
            return true;
          }
        }
      );
    },

    streamTwit: function (twit){
      var userid = '1527228696';
    twit.stream(
    'statuses/filter',
    { follow: userid},
      function(stream) {
          stream.on('data', function(tweet) {

          Fiber(function(){
            if(tweet.user.id_str === userid)
            {
              Meteor.call('addQn', tweet);
            }
          }).run();
          console.log('----------------------tracking tweet-----------------');
              console.log(tweet);
              console.log('---------------------------------------------------------');
              console.log(tweet.user.screen_name);
              console.log(tweet.user.name);
              console.log(tweet.text);
          });
        }
      );
    },

    addQn:function(tweet){
      questionDB.insert({'tweet': tweet, 'date': new Date()});
    }
  });
Fiber(function(){
  Meteor.call('streamTwit', twit);
}).run();
});

PS:I've replace my OAuth key. Thanks in advance

nate-strauser · Answer 1 · 2013-06-21T18:49:13.720

9

i think you should wrap your callbacks with Meteor.bindEnvironment rather than use fibers directly - see here https://gist.github.com/possibilities/3443021

i use this quite extensively and it works well because you stay within the fiber rather than leaving and having to re-enter

normal callback style

someMethod({OPTIONS}, function(callbackReturnArgs){
    //this is the normal callback
));

bind environment wrapped callback

someMethod({OPTIONS}, Meteor.bindEnvironment(
  function(callbackReturnArgs){
    //this is the normal callback
  },
  function(e){
    console.log('bind failure');
  }
));

if you consistently wrap async callbacks like this, meteor is always accessbile

for this bit here

Fiber(function(){
  Meteor.call('streamTwit', twit);
}).run();

you do not need to fiber wrap this, you are already in the Meteor.startup context, so this is redundant - just the Meteor.call(...); will do the trick

edited Jun 21 '13 at 18:49

answered Jun 21 '13 at 13:49

nate-strauser

2,763
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16

Sorry, I'm new to meteor, and I couldn't understand the Meteor.bindEnvironment. Is it possible for you to provide an example? Thanks! – You Hock Tan Jun 21 '13 at 15:22
already was a bindenvironment example - i added the 'normal' example so you can clearly see the difference – nate-strauser Jun 21 '13 at 18:50
what I don't understand is how can I change this to your example above. my functions were written on Meteor.methods, functions were declared as methodname: function(params){}, if so, what exactly is someMethod and whether is {OPTIONS} params? thanks – You Hock Tan Jun 22 '13 at 00:38
Why call back functions are not wrapped by it in default? Does it effect performance? – user3218743 Aug 30 '15 at 14:57

WARNING Error: Meteor code must always run within a Fiber when call method on server

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