nodejs

error:03000086:digital envelope routines::initialization error

export SET NODE_OPTIONS=--openssl-legacy-provider
npm run serve

add node_modules/.bin to PATH to use local modules

export PATH="$(pwd)/node_modules/.bin:$PATH"

nvm

  • Kan nvm aanraden (Simon) 
    nvm install 14
nvm use 14
npm i

install and run nodemon

npx nodemon

documentatie.org resolver (set documentatie.org in /etc/hosts)

const express = require('express')
const app     = express()

app.get('*', (req, res) => {
  res.redirect('https://data.netwerkdigitaalerfgoed.nl/hetutrechtsarchief/UDS/browser?resource='
    + encodeURIComponent("http://" + req.host + req.url))
})

const server = app.listen(80, () => {})

import many JSON files to a new CouchDB database

see [couchdb]

serve textfile as paginated array

var cors = require('cors');
var fs = require('fs');
const express = require('express')
const app = express()
var ids;
var pageSize = 10;

app.use(cors());

app.get('/', (req, res) => res.send('Usage: /1'));

app.get('/:page', function(req, res) {
  var index = req.params["page"] * pageSize;

  res.send(ids.slice(index, index + pageSize).map(id => {
    return {
      id: id
    }
  })); 
});

fs.readFile('data/uids-no-download-niet-compleet.txt', 'utf8', function (err,data) {
  if (err) return console.log(err);
  ids = data.split("\n");
  app.listen(3000, () => console.log('Serve API on port 3000 with '+ids.length+' items'));
});

result:

[
"f7daecfe-c684-5c18-9374-14005ceb992c",
"189bdd36-0fb2-51cf-a2a2-e49d55688f1f",
"32237189-2792-55f8-8765-ef3ddf1c8fc5",
"0e9a560b-11b2-59af-9717-f6058d3412ac",
"8ea7eedf-facc-5e38-bbc2-9f003f59fe46",
"6945af22-a81f-5f2b-bf38-0658847d8a33",
"e45e1be6-7d03-596a-a95b-4281480958d3",
"1a15e70d-ac5d-5e92-9d56-e82d3311b8e6",
"d6d64213-9a8f-5a50-9e41-6b59b0a58766",
"849ca4e2-d158-552d-8622-1234ac3664ed"
]

test2

Debuggen via Chrome Dev Console

node --inspect-brk index.js

Session JAR for 302 redirects

var request = require('request').defaults({
    followRedirect: true,
    followAllRedirects: true,
    jar: true // this creates session 'jar'
});

var url = "http://URL";

request(url, function (error, response, body) {
    console.log(body);
});

express params

app.get('/detail/:id/:index', function(req, res) {
  res.send(req.params);
});

get all links from file using cheerio

var fs = require('fs')
var cheerio = require('cheerio');

fs.readFile('index.html', 'utf8', function (err,data) {
    if (err) return console.log(err);

    var $ = cheerio.load(data);

    $('a').each(function(i, elem) {
        console.log($(this).attr('href'));
    });

});

Redis is ready

generate by: Doodle3D-App/node_modules/superlogin/lib/sessionAdapters/RedisAdapter.js

parse HTML jQuery style

https://github.com/cheeriojs/cheerio

var request = require('request');
var cheerio = require('cheerio');
var url = 'http://www.marktplaats.nl/s/749032247370.html';

request(url, function (error, response, body) {
    if (!error) {
        var $ = cheerio.load(body);
        var url = $('.search-result span').attr('data-url');
        var title = $('.search-result img').attr('title');
        var img = $('.search-result img').attr('src').replace("_82","_83");
        console.log("url:   ",url);
        console.log("title: ",title);
        console.log("img:   ",img);
    } else {
        console.log(error);
    }
});

app.use & app.get/post combined

var express = require('express');
var app = express();
var http = require('http').Server(app);

app.use(express.static(__dirname + '/www'));

app.post('/api/v1/call/:roomName', function(req, res) {
  res.send("Hoi: " + req.params.roomName);
});

http.listen(8081, function(){
  console.log('listening on *:8081');
});

Long polling

Install log

Node.js was installed at

   /usr/local/bin/node

npm was installed at

   /usr/local/bin/npm

Make sure that /usr/local/bin is in your $PATH.

node-webkit

  • What is nw.js (previously node-webkit) ?

Node.js CMS: Keystone

Mail van Peter: Hey Rick, Dat op Node.js CMS waar ik het over had was Keystone. http://keystonejs.com/ Interessante slides: Moving from PHP to a nodejs full stack CMS https://s3.amazonaws.com/mnb_keystone/slidedecks/keystonejs.pdf

Een aantal toffe dingen:

  • Je genereert de basis met Yeoman http://yeoman.io wat je dan vervolgens kan gaan customizen. Dit is eigenlijk bijna de hele frontend.
  • De daadwerkelijke Keystone CMS is gewoon een dependency (npm package)
  • Doordat het veel bekende bouwstenen gebruikt zoals Express en Mongoose (MongoDB) is het sneller te leren en zijn er stiekem al veel resources.
  • Doordat het Express gebruikt kun je allerlei template talen https://github.com/strongloop/express/wiki#template-engines gebruiken.
  • Content types, routes (url's) en overzicht pagina's (denk aan de fabmoments pagina)) beschrijf je met overzichtelijke stukjes javascript.
  • Doordat bijna alles met bestanden werkt (behalve de content) kun je normaal versie beheer doen. (Voor content hebben ze csv export mogelijkheden.)
  • Doordat je werkt met Mongoose en template talen kun je heel makkelijk overzicht pagina's (views) maken.
  • Doordat de flow achter het generen van pagina's heel overzichtelijk is heb ik gisteren al fabpublication pagina's kunnen maken.
  • Stiekem zijn er al veel field types, Relations (verwijzingen naar andere soorten content types), TextField met eventueel wysiwyg editor, intern of extern gehoste afbeeldingen of bestanden, datum.
  • Het lijkt een hele actieve community.
  • Prima docs http://keystonejs.com/docs/.

Nadelen:

Voor puur blogging/publishing is Ghost waarschijnlijk interessanter, maar daar heb ik nog niet echt naar gekeken. https://ghost.org/

Peter

Express extensions + templates

doorbell

gpio's on Raspberry Pi with nodejs

var Gpio = require('onoff').Gpio;

var cols = [
  new Gpio(7, 'in', 'both'),
  new Gpio(8, 'in', 'both'),
  new Gpio(25, 'in', 'both'),
  new Gpio(24, 'in', 'both'),
  new Gpio(23, 'in', 'both')
];

var rows = [
  new Gpio(14, 'out'),
  new Gpio(15, 'out'),
  new Gpio(18, 'out')
];

setInterval(function() {
  rows[0].writeSync(0);
  rows[1].writeSync(0);
  rows[2].writeSync(0);
  var s = '';
  for (var i=0; i<5; i++) {
    s+=cols[i].readSync();
  }
  console.log(s);
},100);

info about semantic versions

http://semver.org/

olimex through serial monitor

screen /dev/tty.NoZAP-PL2303-00001014 115200 pm2 logs

pm2 log

cd ~/......./..... DEBUG=cloud* pm2 start —name=cloud -o /tmp/cloud.log -e /tmp/cloud.error.log index.js

pm2 logs cloud

nodejs http client example

var http = require('http');

http.get("........", function(res) {
  console.log("Got response: " + res.statusCode);

  res.on('data', function (chunk) {
    console.log('BODY length: ' + chunk.length);
  });

  res.on('end', function (chunk) {
    console.log('end');
  });

}).on('error', function(e) {
  console.log("Got error: " + e.message);
});

http client using node request module

var request = require('request');
var fs = require('fs');

request("http://10.0.0.71:8080/?action=snapshot").pipe(fs.createWriteStream('doodle.png'))

nodejs webcam proxy

nodejs webcam stream with EventSource

https://github.com/koajs/webcam-mjpeg-stream

nvm

curl https://raw.githubusercontent.com/creationix/nvm/v0.11.1/install.sh | bash => Close and reopen your terminal to start using NVM nvm install 0.11

socket.io-redis module

https://www.npmjs.org/package/socket.io-redis

Access-Control-Allow-Origin

res.header('Access-Control-Allow-Origin', '*') res.status(200).send(user.toObject());

create a NodeJS client

var io = require('socket.io-client');
var socket = io.connect('http://cloud.doodle3d.com:5000');

socket.on("error", function(data) {
  console.log("error",data);
})

socket.on("connect_error", function() {
  console.log("connect_error");
})

socket.on("connect", function() {
  console.log("connected");
})

pm2

https://github.com/Unitech/pm2 npm install pm2 node_modules/pm2/bin/pm2 start server.js pm2 list pm2 describe ...

install module from github

npm install --save git+https://github.com/nkzawa/socket.io-stream.git

stream handbook

https://github.com/substack/stream-handbook

serve

var express = require('express');
var app = express();
var http = require('http').Server(app);

app.use(express.static(__dirname, '/'));

http.listen(3000, function(){
  console.log('listening on *:3000');
});

nodejs & ajax image loading

dit nog lezen: http://blog.marcon.me/post/31143865164/send-images-through-websockets

//server

var app = require('express')();
var http = require('http').Server(app);
var fs = require('fs');

app.get('/', function(req, res){
  res.sendFile(__dirname+'/index.html');
})

app.get('/image', function(req, res){
  //res.sendFile(__dirname+"/image.png");
  //return;

  fs.readFile('image.png', function(err, data) {
    res.writeHead(200, {'Content-Type': 'text/plain'});
    res.end("data:image/png;base64,"+data.toString("base64"));
  });
})

http.listen(3000, function(){
  console.log('listening on *:3000');
});

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>

<script>
$(document).ready(function() {

  $.get("/image", function(data) {
    $("#img").attr("src",data); //"data:image/jpeg;base64,"+b64;
  });

})
</script>

<img id="img">

binaries over socket.io (wouter)

send an image

fs.readFile('test.png', function(err, data) {
  if (err) throw err; // Fail if the file can't be read.
    res.writeHead(200, {'Content-Type': 'image/png'});
    res.end(data); // Send the file data to the browser.
});

body-parser

var bodyParser = require('body-parser');
//....
app.use(bodyParser.json());
//....
app.post('/stl', function(req, res){
  res.send('<h1>Hello world</h1>');
  console.log(req.body);
})

stljs

https://github.com/cubehero/stljs/blob/master/template/povray.tmpl needs [[povray]] and needs a change in '''node_modules/stljs/lib/to/image.js''': remove '-s' in command.

debug

DEBUG=socket.io* nodemon

webcam stream via websockets

RPC using socket.io (with angular example)

bower

sudo npm install -g bower

webserver example with express

var app = require('express')();
var http = require('http').Server(app);

app.get('/', function(req, res){
  //res.send('<h1>Hello world</h1>');
  res.sendfile('index.html');
})

http.listen(3000, function(){
  console.log('listening on *:3000');
});

socket.io example with express

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

//default namespace
io.on('connection', function(socket) {
  console.log('a user connected');

  socket.on('disconnect', function(){
    console.log('user disconnected');
  });

  socket.on('chat message', function(msg){
    console.log(msg);
    io.emit('chat message', msg);
  });
});

///////// OTHER NAMESPACE
io.of("/printers").on('connection', function(socket) {

  socket.on('list', function(msg){
    console.log("printers.list")
    socket.emit("list",[
      {id:1, name: "test1",network:"network 1"},
      {id:2, name: "test2",network:"network 2"}
    ]);
  });

});

http.listen(3000, function(){
  console.log('listening on *:3000');
});

nodejs socket.io with SSL

websocket chat

install via package managers

install

[https://github.com/joyent/node/wiki/backports.debian.org]()

  1. Install Node and NPM
  2. Run the following (as root): 
    sudo echo "deb http://ftp.us.debian.org/debian wheezy-backports main" >> /etc/apt/sources.list
sudo apt-get update
sudo apt-get install nodejs-legacy
#curl --insecure https://www.npmjs.org/install.sh | bash
curl --insecure https://www.npmjs.org/install.sh > install.sh
chmod +x install.sh
sudo ./install.sh

edit nodejs files remotely with sublimetext (and sftp package) and use nodemon for restarting node server on file change

note: nodemon likes to be installed globally with -g but it also works in your local folder

  npm install  nodemon
  export PATH=$PATH:`pwd`/node_modules/nodemon/bin
  nodemon.js

make nodemon only watch single file

nodemon -w server.js server.js

nodejs socket.io with angular

socket.io with token authentication