Setting/getting pins from the web in Node.js

Discussion in 'General Programming Discussion' started by francescomm, Dec 14, 2013.

  1. francescomm

    francescomm Member

    Joined:
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    Just a quick hack to pilot/read the UDOO from the web/lan, requires node, node-udoo, and that you run this script in node:

    Code:
    ubuntu@udoo:~/nodeweb$ node /home/ubuntu/nodeweb/main.js
Server running at port 8080/ Node v0.10.22 arm
    After this the UDOO will be accessible from the lan (or the web if you configure your routers right).

    Code:
    http://<UDOO ip>/set/?p10=hi
    will light up a led connected to pin 10


    Code:
    // Example of accessing pins from the web
// copyleft Francesco Munafò

// Use as you wish.
// This is not throughly tested code, just a quick hack prototype
// It does seem to work though

// Sample:

// API to get pin values
// http://127.0.0.1:8080/get/?p12&p13&p10
// result: {"p12":"false","p13":"false","p10":"false"}

// API to set pin values
// http://127.0.0.1:8080/set/?p12=hi&p13=lo&p10=hi
// result should be ignored same as below with no params

// if you connect to http://127.0.0.1:8080/ with no params you can see a little web page sample to handle pins 10-13 by clicking links.



var udoo = require('udoo');
var util = require('util');
var http = require('http');
var url = require('url') ;
var fs = require('fs');
var querystring=require('querystring');

udoo.reset()


http.createServer(function (req, res) {
	var parsedUrl = url.parse(req.url,true);
	var getData = parsedUrl.query;
	var urlData = parsedUrl.pathname;

	var postData = "";
	res.outputPins=[];
	res.pinsAdded=0;
	res.pinsDone=0;
	res.done=false;
	
	req.on('data', function (chunk) {
		postData += chunk;
	});
	req.on('end', function () {
		handleRequest(req,res,urlData,getData,querystring.parse(postData));
	});
}).listen(8080);

var postHTML1 = 
  '<html><head><title>Control Panel</title></head>' +
  '<body>' +
  '<div>10 | <a href="/set/?p10=hi">on</a>' +' <a href="/set/?p10=lo">off</a></div>' +
  '<div>11 | <a href="/set/?p11=hi">on</a>' +' <a href="/set/?p11=lo">off</a></div>' +
  '<div>12 | <a href="/set/?p12=hi">on</a>' +' <a href="/set/?p12=lo">off</a></div>' +
  '<div>13 | <a href="/set/?p13=hi">on</a>' +' <a href="/set/?p13=lo">off</a></div>';
  '<div>all <a href="/get/?p10&p11&p12&p13" target="_blank">get</a></div>';
var postHTML2 = 
  '</body></html>';
var postHTML = postHTML1+postHTML2;


function handleRequest(req,res,urlData,getData,postData) {
    var pin,val;
    var doSet=false;
    var doGet=false;
    var callbacks=[];
   
    
    
      
    // Suggested use is /get/ as a directory with final slash
     if(urlData=="/get" || urlData=="/get/" || urlData=="/get.php") {
        doSet=false;
        doGet=true;
    } else if(urlData=="/set" || urlData=="/set/" || urlData=="/set.php") {
        doSet=true;   
        doGet=false;
    } else {
        res.end(postHTML);
        return;
    }
    
    var pins=[];
    var pinsCount=0;
    var done=false;

    for(var it in getData) {
    	pin=(it);
        val=getData[it];
        
        if(pin.substr(0,1)=="p") {
            pin=pin.substr(1);
            pin=parseInt(pin);
            console.log("\nPIN: "+pin+" "+val);
            if(doSet) {
                var led=udoo.outputPin(pin);    
                if(val==="hi" || val=="on" || val=="high" || val=="255") {
                    led.setHigh();
                } else if(val==="lo" || val=="off" || val=="low" || val=="0") {
                    led.setLow();
                } else {
                    led.set(parseInt(val)); // NOT SUPPORTED YET BY NODEUDOO
                }
                
            } else {
                res.pinsAdded++;
                var led=udoo.inputPin(pin);
                // console.log("\nSEARCH "+'p'+pin+"=?");
                getAndSave(led,pin,res);
            }
        }
    }
    res.done=true;
    // console.log("\nTEST "+res.outputPinsCount+">="+pinsCount);
    if(res.pinsDone>=res.pinsAdded) {
       console.log("done after loop.");
       shootout(res);
    }
    
    
}

function getAndSave(led,apin,res) {
    var apin2=apin;
    led.get(function(err,val) {
        var tmp=0+apin2;
        res.outputPins["p"+tmp]=val;
        if(res.done) console.log("GOT(d) "+'p'+tmp+"="+val);
        else console.log("GOT "+'p'+tmp+"="+val);
        res.pinsDone++;
        if(res.done && res.pinsDone>=res.pinsAdded) {
            console.log("done after received data.");
            shootout(res);
            res.pinsDone=-1;
        }
   });
}
function shootout(res) {
        // res.write("URL "+util.inspect(urlData));
        // res.write("GET "+util.inspect(getData));
        // res.write("POST "+util.inspect(postData));
        console.log(res.outputPins);
        var out="{";
        var sep="";
        for(var it in res.outputPins) {
            out+=sep+'"'+it+'":"'+res.outputPins[it]+'"';
            sep=",";
        }
        out+='}';
        if(out=="{}") {
            res.setHeader("Content-Type", "text/html");
            res.writeHead(200);
            res.end(postHTML);
        } else {
            res.setHeader("Content-Type", "text/plain");
            res.writeHead(200);
            // res.write(postHTML1);
            // res.write(out);
            // res.end(postHTML2);
           res.end(out);
        }
        // console.log("\nCLOSE.");
}


console.log('Server running at port 8080/ Node '+process.version+ ' '+process.arch);
    Have fun!

    UDOO Rocks.
     
    francescomm, Dec 14, 2013
    #1
  2. Rickor

    Rickor New Member

    Joined:
    Nov 30, 2013
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    Rickor, Dec 19, 2013
    #2

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