Simple examples for Building for the Web: Day 2 - The Backend

app.js

'use strict';
var express = require('express');
var app = express();

app.get('/api/v1/songs', function(req, res) {
  var data = {
    songs: [{
      id: 1,
      album: 1,
      favorite: false,
      name: 'Pretty When You Cry'
    }, {
      id: 1,
      album: 1,
      favorite: false,
      name: 'Money Power Glory'
    }]
  };

  res.json(data);
});

var server = app.listen(8000, function() {
  console.log('Listening on port %d', server.address().port);
});

app.py

from flask import Flask, jsonify


app = Flask(__name__)


@app.route('/api/v1/songs')
def songs():
    data = {
        'songs': [{
            'id': 1,
            'album': 1,
            'favorite': False,
            'name': 'Pretty When You Cry'
        }, {
            'id': 2,
            'album': 1,
            'favorite': True,
            'name': 'Money Power Glory'
        }]
    }

    return jsonify(data)

if __name__ == '__main__':
    app.run()

app.rb

require 'sinatra'
require 'json'

get '/api/v1/songs' do
    data = {
        'songs' => [{
            'id' => 1,
            'album' => 1,
            'favorite' => false,
            'name' => 'Pretty When You Cry'
        }, {
            'id' => 2,
            'album' => 1,
            'favorite' => true,
            'name' => 'Money Power Glory'
        }]
    }

    data.to_json
end

main.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
	"os"
)

type Response map[string]interface{}

func (r Response) String() (s string) {
	b, err := json.Marshal(r)
	if err != nil {
		s = ""
		return
	}
	s = string(b)
	return
}

type Song struct {
	Id       int    `json:"id"`
	Album    int    `json:"album"`
	Name     string `json:"name"`
	Favorite bool   `json:"favorite"`
}

func songsHandler(w http.ResponseWriter, r *http.Request) {
	if r.Method == "GET" {
		songs := make([]Song, 2)

		songs[0] = Song{
			Id:       1,
			Name:     "Pretty When You Cry",
			Album:    1,
			Favorite: false,
		}

		songs[1] = Song{
			Id:       2,
			Name:     "Money Power Glory",
			Album:    1,
			Favorite: true,
		}

		data := Response{"songs": songs}

		w.Header().Set("Content-Type", "application/json")
		fmt.Fprint(w, data)
		return
	}
}

func main() {
	http.HandleFunc("/api/v1/songs", songsHandler)

	err := http.ListenAndServe(getPort(), nil)

	if err != nil {
		log.Fatal("ListenAndServe: ", err)
		return
	}
}

func getPort() string {
	var port = os.Getenv("PORT")

	// Set a default port if there is nothing in the environment
	if port == "" {
		port = "8080"
	}

	log.Println("INFO: Listening to http://localhost:" + port)

	return ":" + port
}