Learn You Node exercises

httpClient.js

var http = require('http')

http.get(process.argv[2], (res) => {
  res.setEncoding('utf8')
  res.on('data', console.log)
  res.on('error', console.error)
}).on('error', (e) => {
  console.error(`Got error: ${e.message}`)
})

httpCollect.js

var http = require('http')
var bl = require('bl')

http.get(process.argv[2], (res) => {
  res.setEncoding('utf8')
  res.pipe(bl( (err, data) => {
    if (err) {
      console.error(err)
    } else {
      data = data.toString()
      console.log(data.length)
      console.log(data)
    }
  }))
})

httpServer.js

var http = require('http')
var fs = require('fs')

var server = http.createServer(function(request, response) {
  response.writeHead(200, 'application-type/text')
  fs.createReadStream(process.argv[3]).pipe(response)
})

server.listen(Number(process.argv[2]))

httpToUpperCase.js

var http = require('http')
var map = require('through2-map')

var server = http.createServer(function(request, response) {
  if(request.method !== 'POST') {
    response.end('POST \n')
  }

  request.pipe(map(function(chunk) {
    return chunk.toString().toUpperCase()
  })).pipe(response)

})

server.listen(Number(process.argv[2]))

jugglingAsync.js

'use strict'
var http = require('http')
var bl = require('bl')
var results = []
var count = 0

function printResults() {
  for(var i = 0; i < 3; i++) {
    console.log(results[i])
  }
}

function getUrl(index) {
  http.get(process.argv[2 + index], function(response) {
    response.pipe(bl(function(err, data) {
      if (err) {
        console.error(err)
      }
      results[index] = data.toString()
      count++

      if (count === 3) {
        printResults()
      }
    }))
  })
}

for (var i = 0; i < 3; i++) {
  getUrl(i)
}

jugglingAsync2.js

// From a discussion on the node github, I wanted to compare the solutions for optimization

var http = require('http');
var urls = [process.argv[2], process.argv[3], process.argv[4]]; 
var holder = [];
var count = 1;
var endCount = 0;

for(var i in urls){     

      responseCount(i, urls[i])

  }

function responseCount(count, url){
    http.get(url, function(res){
        res.setEncoding('utf8');                            

        var string = '';
        res.on('data', function(chunk){         

            string += chunk;

        });

        res.on('end', function(){
            holder[count] = string;
            endCount ++;
            if(endCount >= 3){
                for(var i in holder){
                    console.log(holder[i]); 
                }

            }
        })


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

timeServer.js

var net = require('net')

function fillTime (i) {
  return (i < 10 ? '0' : '') + i
}

function dateNow() {
  var data = new Date()

  return data.getFullYear() + '-' + 
  fillTime(data.getMonth() + 1) + '-' + 
  fillTime(data.getDate()) + ' ' + 
  fillTime(data.getHours()) + ':' + 
  fillTime(data.getMinutes())
}

var server = net.createServer(function (socket) {
  socket.end(dateNow() + '\n')
})
server.listen(Number(process.argv[2]))