node.js authetication

TimL

Hi,

I'm using LightStreamer to connect with IG Index (https://labs.ig.com/streaming-api-guide). I have succeeded using javascript in Chrome and now I am trying with node.js with very similar code. I can connect over http to "http://push.lightstreamer.com" without any authentication but I can't connection to https with a password. What am I missing? I am sure the endpoint, clientId and password are correct in that they are the same as the Chrome version which works. I keep getting:

Lightstreamer connection status:CONNECTING
Lightstreamer connection status :Smile_Ag: ISCONNECTED:WILL-RETRY
Lightstreamer connection status:CONNECTING
Lightstreamer connection status :Smile_Ag: ISCONNECTED:WILL-RETRY
Lightstreamer connection status:CONNECTING

Thanks for your help!
Tim

Node.js Code

    ls = require("lightstreamer-client");


    IGInterface.prototype.connectToLightstreamer = function(loginCallback) {
      console.log("Connecting to lightstreamer");
      this.lsClient = new ls.LightstreamerClient(this.lsEndpoint);
      this.lsClient.connectionDetails.setUser(this.clientId);
      this.password = "";
      if (this.clientToken) {
        this.password = "CST-" + this.clientToken;
      }
      if (this.clientToken && this.accountToken) {
        this.password = this.password + "|";
      }
      if (this.accountToken) {
        this.password = this.password + "XST-" + this.accountToken;
      }
      this.lsClient.connectionDetails.setPassword(this.password);
      console.log(this.lsClient.connectionDetails);
      this.lsClient.addListener({
        onListenStart: (function(_this) {
          return function() {
            return _this.showMessage("Lightstreamer client - start listening");
          };
        })(this),
        onStatusChange: (function(_this) {
          return function(status) {
            _this.showMessage("Lightstreamer connection status:" + status);
            if (status === "CONNECTED:WS-STREAMING") {
              return loginCallback();
            }
          };
        })(this)
      });
      return this.lsClient.connect();
    };

Giuseppe Corti

Hi Tim,

Please could you confirm if your node app is able to connect to "https://push.lightstreamer.com"?
Furthermore, please enable the detailed log of the Lightstreamer JavaScript client library so that we can get some more precise information about what is happening.
You should add something like this to your code:

[SYNTAX=JS]var loggerProvider = new ls.SimpleLoggerProvider();
ls.LightstreamerClient.setLoggerProvider(loggerProvider);
var myAppender = new ls.ConsoleAppender("DEBUG", "*");
loggerProvider.addLoggerAppender(myAppender);[/SYNTAX]

Regards,
Giuseppe

TimL

I am able to connect to https://push.lightstreamer.comas well as http://push.lightstreamer.com . I've attached the LoggerProvider and the error looks to be 'License not valid for this Client version'. Is there anything I can do about that without access to the server?

Full log:

Giuseppe Corti

Hi Tim,

To fix your issue should be enough change the version of the JavaScript client library in use. The correct one to use with IG servers is those downloadable from here(sdk_client_javascript.zip\sdk_client_javascript\alternative_libs\lightstreamer_node.js).

Regards,
Giuseppe

TimL

Thanks! I'll give that a go.

TimL

Thank you Giuseppe! This is probably a bit of a noob question but how do I use that library in node.js? I am requiring it like so:

ls = require "../thirdparty/lightstreamer_node.js"

but ls appears to be an empty object when I log it. I have tried putting module.exports at the beginning of the lightstreamer_node.js file (which is minified):

module.exports = (function(){function u(){return function(g){return g}}function D().....

but ls is then undefined for some reason. Also, unless I require "amdefine" at the beginning of the minified lightstreamer_node.js file I get the error "define is not defined".

var define = require("amdefine");

This all just worked when I npm installed lightstreamer-client. I have even tried replacing the lightstreamer.js file with the contents of the lightstreamer_node.js file in the node_modules folder but no luck. Any help would be much appreciated.

Cheers,
Tim

Edit:
I have also npm installed faye-websocket and xmlhttprequest as I think they are dependencies but still no dice.

Giuseppe Corti

Hi Tim,

Unfortunately the versions prior to 6.2.3 of lightstreamer-client package can not be obtained through "npm istall".
So you should use the lightstreamer_node.js file and rely on an AMD loader (i.e.: require.js).
Please refer to section "2.3.5.2 Using the AMD loader" of "JavaScript Client Guide" documentation, but in your case something like this should work:

[SYNTAX=JS]var requirejs = require('requirejs');

requirejs.config({
deps: ["lightstreamer_node.js"],
nodeRequire: require
});

requirejs(["LightstreamerClient","Subscription"],function(LightstreamerClient,Subscription) {
//YOUR CODE HERE
});[/SYNTAX]

TimL

Sorry to bother you again Giuseppe. Perhaps this is one for Stack Overflow: Why would define still be undefined after requiring lightstreamer_node.js in the way you described above? From what I have read here: http://requirejs.org/docs/node.html requirejs should define define for me.

I have installed requirejs

npm install requirejs

and my code looks like this

    var ls = {};

    IGInterface.prototype.connectToLightstreamer = function(loginCallback) {
      var requirejs;
      requirejs = require('requirejs');

      requirejs.config({
        deps: ["../thirdparty/lightstreamer_node.js"],
        nodeRequire: require
      });

      return requirejs(["LightstreamerClient", "Subscription"], (function(_this) {
        return function(LightstreamerClient, Subscription) {
          ls.LightstreamerClient = LightstreamerClient;
          ls.Subscription = Subscription;
          _this.lsClient = new ls.LightstreamerClient(_this.endPoint);
          _this.lsClient.connectionDetails.setUser(_this.clientId);
          _this.lsClient.connectionDetails.setPassword(_this.getPassword());
          _this.lsClient.addListener({
            onStatusChange: function(status) {
              _this.showMessage("LS connection status: " + status);
              if (status === "CONNECTED:WS-STREAMING") {
                return loginCallback();
              }
            }
          });
          return _this.lsClient.connect();
        };
      })(this));
    };

the error is

/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:2585
                    throw err;
                          ^
Error: Tried loading "../thirdparty/lightstreamer_node.js" at ../thirdparty/lightstreamer_node.js then tried node's require("../thirdparty/lightstreamer_node.js") and it failed with error: ReferenceError: define is not defined
    at /home/ubuntu/workspace/node_modules/requirejs/bin/r.js:2578:27
    at Object.context.execCb (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:1929:33)
    at Object.Module.check (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:1129:51)
    at Object.Module.enable (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:1416:22)
    at Object.Module.init (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:1034:26)
    at callGetModule (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:1443:63)
    at Object.context.completeLoad (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:1822:21)
    at Function.req.load (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:2591:17)
    at Object.context.load (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:1918:21)
    at Object.Module.load (/home/ubuntu/workspace/node_modules/requirejs/bin/r.js:1080:29)

I have tried reinstalling requirejs several times, deleting it in node_modules first and I've also re downloaded lightstreamer_node.js to make sure it's not been corrupted by me. Any ideas?

Cheers,
Tim

TimL

I eventually fixed this. lightstreamer_node.js had to be in the same directory as the file I was writing: https://github.com/jrburke/requirejs/issues/122

Giuseppe Corti

Hi Tim,

Good news, thank you for the feedback.

Mone

Hi,

we just published version 6.1.4 on npm, so you can install the old version from there (and thus stop using the requirejs package)
You can install the old version by using either
npm install lightstreamer-client@6.1.4
or
npm install lightstreamer-client@legacy-server-5.1.2

you can also obviously configure your package.json accordingly