QRCodeReader.js

main.js

/*jslint node:true, vars:true, bitwise:true, unparam:true */
/*jshint unused:true */
// Leave the above lines for propper jshinting

var execSync = require('exec-sync');
    
var isProcessing = 0;
//var shellPython = require('python-shell');

var upmBuzzer = require("jsupm_buzzer");
var mBuzzer = new upmBuzzer.Buzzer(3); //Buzzer for sound notification

var app = require('express')(); //Express Library
var http = require('http');
http.post = require('http-post');

// Server Cloud
var serverAddress = "http://edison-hesahesa.rhcloud.com/edison/payment/iot";

var server = require('http').Server(app); //Create HTTP instance
var io = require('socket.io')(server); //Socket.IO Library


var mraa = require('mraa');
var LCD  = require ('jsupm_i2clcd'); //LCD to display price & color notification
console.log('Current version of MRAA is', mraa.getVersion());

var touch = new mraa.Aio(0); //touch sensor for input testing
var touchValue;
var lcdMessage=" ";
var myLCD = new LCD.Jhd1313m1(6, 0x3E, 0x62);

var myLED = new mraa.Gpio(2);
myLED.dir(mraa.DIR_OUT);

var price = "20.000"; //sample price
var nowDate = new Date();
var trxID = "";
myLCD.setColor(0,0,255);

var success = true;

function readQRcode()
{
    console.log("Reading QR code...");
    
    //Take a picture from the USB camera - from command line
    //var result = execSync('python /home/root/qrCodeScanner.py');
    var resultPython = execSync('sudo python /home/root/qrCodeScanner.py');
    //execSync('python',['/home/root/qrCodeScanner.py'],function(err,result){ 
    console.log(resultPython);
    console.log("Done capturing image");
    isProcessing = 0;
    return resultPython;
} 

// run external command to activate USB
/*
function run_cmd(cmd, args, callBack ) {
    var spawn = require('child_process').spawn;
    var child = spawn(cmd, args);
    var resp = "";

    child.stdout.on('data', function (buffer) { resp += buffer.toString(); });
    child.stdout.on('end', function() { callBack (resp); });
}*/

function showDisplay(LCD,msg1, msg2){
    //update text display on LCD
    LCD.clear();
    LCD.setCursor(0,1);
    LCD.write(msg1);
    LCD.setCursor(1,15 - msg2.length);
    LCD.write(msg2);
    
}

function successNotif(Buzzer, LED, LCD){
    //give notification when transaction is success
    LED.write(1);
    LCD.setColor(0,255,0);
    
    showDisplay(LCD,"SUCCESS!!", "Thank You :)");
    Buzzer.playSound(1000, 100000);
    Buzzer.playSound(2000, 200000);
    Buzzer.stopSound();
    
    LCD.setColor(0,0,255);
    LED.write(0);
    
    isProcessing = 0;
    setTimeout(displayWelcome,5000);
}

function inputNotif(Buzzer, LED, LCD){
    //give notification when transaction is success
    LED.write(1);
    LCD.setColor(255,255,0);
    
    Buzzer.playSound(500, 50000);
    Buzzer.stopSound();
    
    LCD.setColor(255,255,0);
    LED.write(0);
}

function failNotif(Buzzer, LED, LCD){
    //give notification when transaction is failed
    LCD.setColor(255,0,0);
    showDisplay(LCD,"Transaction","ERROR :(");
    
    Buzzer.playSound(20000, 600000);
    Buzzer.stopSound();
    
    LCD.setColor(255,0,0);
    LED.write(0);
    
    isProcessing = 0;
    setTimeout(displayWelcome,5000);
}

// Timeout Notification
function timeoutNotif(Buzzer, LED, LCD){
    //give notification when transaction is failed
    LCD.setColor(255,0,0);
    showDisplay(LCD,"Transaction","TIMEOUT :(");
    
    Buzzer.playSound(20000, 600000);
    Buzzer.stopSound();
    
    LCD.setColor(255,0,0);
    LED.write(0);
    
    isProcessing = 0;
    setTimeout(displayWelcome,5000);
}


// Handle Payment
function handlePayment() {
    var result = readQRcode();
    console.log("payment " + result);
    if(result == "timeout") {
        console.log("payment failed: timeout");
        timeoutNotif(mBuzzer, myLED, myLCD);   // timeout
    } else if(result !== undefined) {
        var resultSplit = result.split(" ");
        if(resultSplit[1] == "QRCODE") {
            if(resultSplit[3] !== ""){
                var userToken = resultSplit[3].replace(/^"(.*)"$/, '$1');
                console.log("userToken: " + userToken);
                trxID = "TRX-" + nowDate.getYear() + nowDate.getMonth() + nowDate.getDate() + nowDate.getHours() + nowDate.getMinutes() + nowDate.getSeconds();
                http.post(serverAddress, { paymenttoken: trxID, usertoken: userToken, ammount: price }, function(res){
                    res.setEncoding('utf8');
                    res.on('data', function(chunk) {
                        console.log(chunk);
                        if(chunk.indexOf("success") !== -1) {
                            console.log("payment success");
                            successNotif(mBuzzer,myLED,myLCD);
                        } else {
                            console.log("payment failed");
                            failNotif(mBuzzer, myLED, myLCD);                           
                        }
                    });
                });
                //showDisplay(myLCD,"","");
            }
        }
    }
}

function displayWelcome(){
    myLCD.setColor(0,0,255);
    showDisplay(myLCD,"Welcome","ALSTUBLIEFT :)");
}

//listener for price input
io.on('connection', function(socket){
    console.log("come here");
    socket.on('changePrice', function(data){ //on incoming websocket message...
        if(isProcessing === 0) { // Only handle one transcation at a time
            inputNotif(mBuzzer,myLED,myLCD);
            isProcessing = 1;
            price = data;
            showDisplay(myLCD, "TOTAL",price);
            handlePayment();
        }
    });
});                   

server.listen(3000);

// Main function
function loop() {
    lcdMessage = price;
    
    var readTouch = touch.read();
    readTouch = Math.round(readTouch*0.1);
    mBuzzer.stopSound();
    if(touchValue != readTouch){
        touchValue = readTouch;

        console.log(lcdMessage); 

        if(touchValue > 50){
            success = !success; //alternate between success and fail
            if(success){
                successNotif(mBuzzer,myLED, myLCD);
            }else{
                failNotif(mBuzzer,myLED, myLCD);
            }
            
        }
        
    }
    setTimeout(loop,100);
}

displayWelcome();
loop();