Support

Lets do some coding stuff :)

/**
 * YoutubeService
 *
 * @description :: Server-side logic for managing youtubes
 * @help        :: See http://sailsjs.org/#!/documentation/concepts/Controllers
 */

module.exports = {
        /**
         * Method: getChannelSubscriberCount
         * @return json
         * returns Gets number of subscribers for channel
         */
        getChannelSubscriberCount: function(headers, parameters, callback) {
                var url = sails.config.youtubeDataV3.baseUrl + '/channels';
                var params = {
                	part:'statistics',
                	id:parameters.channelId
                };

                var postHeader={
                    'User-Agent': headers.host,
                    'Accept':'application/json',
                    'Authorization':headers.authorization // pass authorization header received in request
                };

                RequestService.getData(url, postHeader, params, callback);
        },
}

/api/controllers/YoutubeController.js

/**
 * YoutubeController
 *
 * @description :: Server-side logic for managing youtube
 * @help        :: See http://sailsjs.org/#!/documentation/concepts/Controllers
 */

module.exports = {
        /**
         * Method: channelSubscriberCount
         * @return json
         * returns Gets YouTube Channel subscriber count
         */
        channelSubscriberCount: function(req, res) {
                console.log("Headers: ", req.headers);
                console.log("Query Parameters: ", req.query);
                YoutubeService.getChannelSubscriberCount(req.headers, req.query, function(err, response, data) {
                        if (err || response.statusCode != 200) {
                            if (err) {
                                console.log(err);
                                return res.status(500).send(err)
                            } else {
                                return res.status(response.statusCode).send(response.body);
                            }
                        };
                        
                        // Building object for LaMetric. We will return it
                        var responseObj={};
                        responseObj.frames=[];
                        var frame = {
                            'index':0,
                            'text': '0',
                            'icon':'i280',
                        };

                        // Checking if we have required parameters passed to our API. 
                        if (req.query.channelId === '') {
                            // If no channel Id – displaying this text
                            frame.text = 'CHNL?'
                        } else {
                            // Getting subscriber count from YouTube Data API response.
                            frame.text = data.items[0].statistics.subscriberCount;                        
                        }

                        responseObj.frames.push(frame);

                        if (!data) {
                            console.log("Error: ", response.statusCode);
                            res.status(response.statusCode).send(response.body);
                        } else {
                            console.log("Response: ", responseObj);
                            return res.status(200).json(responseObj);
                        }
                })
        },
}

Starting Web Service

Now when the code is in place it is time to start our web service. At first, let's install some NodeJS dependencies:

# npm install request

And start Web service:

# sails lift

Web service should work on your computer at this point. To access it in your network you should know your computer’s IP address. LaMetric should access it on your local network just fine. But if you are planning to publish your app for everyone – please consider hosting your web service somewhere in the cloud. There are few free NodeJS hostings you can use (for example OpenShift – https://www.openshift.com/pricing/index.html).

LaMetric Application

Now it is time to create LaMetric app – a client for your web service.

Steps:

1. Go to https://developer.lametric.com
2. Create indicator app with single frame:
   
   
3. Choose app type to be “Poll”
4. Fill in your data URL and poll frequency
    
5. Add OAuth2 authentication option
   
   

   OAuth2 type	Google
   Client id	<your client id>
   Client secret	<your client secret>
   Auth URL	https://accounts.google.com/o/oauth2/v2/auth?access_type=offline&prompt=consent
   Redirect URI	http://lametric.com/redirect
   Scope	https://www.googleapis.com/auth/youtube.readonly
   Response type	Code
   Access/Refresh token URL	https://www.googleapis.com/oauth2/v4/token

   
   

6. Add option for channel ID that we will be used in order to get subscribers
   
   
7. Publish your app privately.