I am trying to integrate kurento with Meteor. I am facing problems in converting the nested callbacks of Node.JS into proper Meteor server code.
Below is my code which I am trying to convert using Meteor.wrapAsync
:
kurento(args.ws_uri, function(error, client) {
if ( error ) return onError(error);
client.create('MediaPipeline', function(error, pipeline) {
if ( error ) return onError(error);
console.log("Got MediaPipeline");
pipeline.create('RecorderEndpoint', { uri : file_uri }, function(error, recorder) {
if ( error ) return onError(error);
console.log("Got RecorderEndpoint");
pipeline.create('WebRtcEndpoint', function(error, webRtc) {
if ( error ) return onError(error);
console.log("Got WebRtcEndpoint");
webRtc.connect(recorder, function(error) {
if ( error ) return onError(error);
console.log("Connected");
recorder.record(function(error) {
if ( error ) return onError(error);
console.log("record");
webRtc.connect(webRtc, function(error) {
if ( error ) return onError(error);
console.log("Second connect");
});
webRtc.processOffer(offer, function(error, answer) {
if ( error ) return onError(error);
console.log("offer");
return answer;
});
});
});
});
});
});
});
I am trying to write it in meteor server using wrapAsync as below.
client = Meteor.wrapAsync(kurento,ws_uri);
//client = Meteor.wrapAsync(getKurentoClient);
console.log("got connected to server");
pipeline = Meteor.wrapAsync(client.create,'MediaPipeline');
console.log("Got MediaPipeline");
var webRtc = Meteor.wrapAsync(pipeline.create,'WebRtcEndpoint');
console.log("Got WebRtcEndpoint");
var recorder = Meteor.wrapAsync(pipeline.create,('RecorderEndpoint', {uri: file_uri}));
console.log("Got RecorderEndpoint");
Meteor.wrapAsync(webRtc.connect,recorder);
console.log("Connected recorder");
Meteor.wrapAsync(webRtc.connect,webRtc);
console.log("Connected webRtc");
Meteor.wrapAsync(recorder.record);
console.log("started recording");
var sdpAnswer = Meteor.wrapAsync(webRtc.processOffer,offer);
console.log("sdpAnswer"+sdpAnswer());
return sdpAnswer;
Whenever I am trying to do something like this, I am getting a function as output, not the object!. Below is the output of my last concole log statement to see sdpanswer.
Exception while invoking method 'onOffer' TypeError: Cannot call method 'apply' of undefined
I20150722-19:10:15.185(5.5)? at packages/meteor/helpers.js:118:1
I20150722-19:10:15.186(5.5)? at [object Object].Meteor.methods.onOffer (app/absimpl.js:90:31)
I20150722-19:10:15.186(5.5)? at maybeAuditArgumentChecks (packages/ddp/livedata_server.js:1617:1)
I20150722-19:10:15.186(5.5)? at packages/ddp/livedata_server.js:648:1
I20150722-19:10:15.186(5.5)? at [object Object]._.extend.withValue (packages/meteor/dynamics_nodejs.js:56:1)
I20150722-19:10:15.186(5.5)? at packages/ddp/livedata_server.js:647:1
I20150722-19:10:15.186(5.5)? at [object Object]._.extend.withValue (packages/meteor/dynamics_nodejs.js:56:1)
I20150722-19:10:15.186(5.5)? at [object Object]._.extend.protocol_handlers.method (packages/ddp/livedata_server.js:646:1)
I20150722-19:10:15.186(5.5)? at packages/ddp/livedata_server.js:546:1
How can I properly convert a callback hell to a nice synchronous function using Meteor.wrapAsync
?