BitSwitch Countertparty version

bitswitch_intel_edison_counterparty.js

/*jslint node:true, vars:true, bitwise:true, unparam:true */
/*jshint unused:false */
/*global */

var mraa = require('mraa'); //require mraa
var request = require('request');
var _ = require('underscore')

var addr2watch = '1LJ4rddYGzT8GqwQioMNw3cYQJdwjM3Drs' // bitcoin address to watch 
var assetName  = 'PROG'
//var loop_time  = 10000 // ms (checks every 10 sec)
var loop_time  = 3000  // ms   (checks every 3 sec)
var balance    = null
var relayPin   = new mraa.Gpio(13)

var check_balance = function(){
  // this version uses xcp.blockscan.com API
  var url = 'http://xcp.blockscan.com/api2?module=address&action=balance&btc_address='+addr2watch+'&asset='+assetName
  request(url, function (error, response, body) {
    if (!error && response.statusCode == 200) {
      var json = JSON.parse(body)
      if (json.status != "error") {
        // var unconfirmed = Math.abs(json.data[0].unconfirmed_balance)
        // var value = parseInt(unconfirmed)
        // 
        // you can use var unconfirmed and value above to test, otherwise you have to wait for btc blockchain confirmation time
        var bal = json.data[0].balance
        var value = parseInt(bal)

        // this is the simplest approach, just check if the balance if different
        // you could check if the price is increased by X amount or better if you got a transaction exactly of x btc
        // console.log("balance:", balance, value) // uncomment this to see the balance at every tick (check)
        if (balance && balance != value)
          activate()

        balance = value
      } else {
        console.log("error:", json.message) 
      }
    }
    _.delay(check_balance, loop_time)
  })
}

var activate = function() {
  console.log("Address balance changed, new one is:", balance, assetName)
  console.log("Let there be light!")
  relayPin.write(0); 
}

var main = function() {
  console.log('MRAA Version: ' + mraa.getVersion()); //write the mraa version to the Intel XDK console
  relayPin.dir(mraa.DIR_OUT);
  relayPin.write(1); 
  
  console.log("check_balance() initialized")
  check_balance()
}


main()