chaosc-cosmdisplay/cosm.js

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var restify = require('restify')
, util = require('util')
, EventEmitter = require('events').EventEmitter;
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// constructor function
function Cosm(streams, key) {
var self = this;
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self._streams = streams;
self._interval = 5000;
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self._jsonClient = restify.createJsonClient({
url: 'http://api.cosm.com',
headers: { 'X-ApiKey': key },
version:'*'
});
var recentvalues = {};
setInterval(function() {
for(var i=0; i<streams.length; i++) {
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self._jsonClient.get('/v2/feeds/' + self._streams[i] + ".json", function(err, req, res, obj) {
if(err || obj.datastreams == null) {
console.error("error getting stream: " + err)
return;
}
for(var i=0; i<obj.datastreams.length; i++) {
var dataStream = obj.datastreams[i];
if(dataStream.id == null) continue;
var streamName = dataStream.id;
if(streamName.length < 2 && dataStream.tags != null) {
streamName = dataStream.tags[0] + streamName;
}
var currentValue = dataStream.current_value;
if(isNumber(currentValue)) currentValue = parseFloat(currentValue);
var object = {
'stream': obj.id,
'feed': dataStream.id,
'tags': dataStream.tags,
'displayname': streamName,
'value': currentValue
};
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var address = obj.id + ":" + dataStream.id;
console.log(recentvalues[address] + " " + currentValue);
console.log(typeof(recentvalues[address]) + " " + typeof(currentValue));
if(recentvalues[address] !== currentValue) {
self.emit('changedvalue', object);
}
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else
self.emit('updatevalue', object);
recentvalues[address] = currentValue;
}
});
}
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}, self._interval);
}
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util.inherits(Cosm, EventEmitter);
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Cosm.prototype.getStreams = function(streams, callback) {
var self = this;
for(var i=0; i<streams.length; i++) {
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self._jsonClient.get('/v2/feeds/' + streams[i] + ".json", function(err, req, res, obj) {
if(err || obj.datastreams == null) {
console.error("error getting stream: " + err)
return;
}
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// console.dir(obj);
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var object = {
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id: obj.id,
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description: obj.description,
lat: typeof obj.location === 'undefined' ? 'undefined' : obj.location.lat,
lon: typeof obj.location === 'undefined' ? 'undefined' : obj.location.lon,
location: typeof obj.location === 'undefined' ? 'undefined' :obj.location.name,
title: obj.title
};
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if(callback != 'undefined') callback(object);
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});
}
};
module.exports = Cosm;
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function isNumber(value) {
if ((undefined === value) || (null === value)) {
return false;
}
if (typeof value == 'number') {
return true;
}
return !isNaN(value - 0);
}