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site.node.js
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var pg = require('pg'),
express = require('express'),
swig = require('swig'),
bodyParser = require('body-parser'),
cookieParser = require('cookie-parser'); //npm install cookie-parser
var Actions = {
GET: [
{
path: '/',
template: './template/auth.html'
},
{
path: '/exit',
template: './template/auth.html',
callback: function(page, resource){
resource.clearCookie('id');
resource.clearCookie('login');
resource.redirect('/');
}
},
{
path: '/films',
template: './template/films.html',
callback: function(page, resource){
SQL.Query('SELECT m.id, m.title, m.poster, m.rank, ARRAY_AGG(l.user_id) as likes FROM movie m LEFT JOIN likes l ON m.id = l.movie_id GROUP BY (m.id) ORDER BY m.id', function(data){
SQL.Query('SELECT m.id, m.title, m.poster, m.rank, COUNT(l) as likes FROM likes l JOIN movie m ON l.movie_id = m.id GROUP BY (m.id) ORDER BY likes DESC LIMIT 10', function(dataTop){
resource.send(page({
'data': data,
'top': dataTop
}));
});
});
}
},
{
path: '/films/:film_id',
template: './template/film.html',
callback: function(page, resource, request){
//SELECT m.id, m.title, m.poster, m.rank, ARRAY_AGG(l.user_id), ARRAY_AGG(c.text) FROM movie m LEFT JOIN likes l ON m.id = l.movie_id LEFT JOIN comment c ON m.id = c.movie_id WHERE m.id = 1 GROUP BY (m.id)
//Возвращает несколько записей
SQL.Query('SELECT m.id, m.title, m.poster, m.rank, m.year, ARRAY_AGG(l.user_id) as likes, r.rating FROM movie m LEFT JOIN likes l ON m.id = l.movie_id LEFT JOIN ratings r ON m.id = r.movie_id AND r.user_id = ' + request.cookies.id + ' WHERE m.id = ' + request.params.film_id + ' GROUP BY (m.id, r.rating)', function(data){
SQL.Query('SELECT t1.text, t2.name FROM comment t1 JOIN users t2 ON t1.user_id = t2.id WHERE t1.movie_id = ' + request.params.film_id + ' ORDER BY t1.id', function(dataComments){
SQL.Query('SELECT * FROM movie WHERE rank BETWEEN ' + data[0].rank + ' - 0.5 AND ' + data[0].rank + ' + 0.5 AND year BETWEEN ' + data[0].year + ' - 3 AND ' + data[0].year + ' + 3 AND id <> ' + data[0].id, function(dataSame){
resource.send(page({
'movie': data[0],
'near': dataSame,
'comments': dataComments
}));
});
});
});
}
},
{
path: '/recommendations/users',
template: './template/rec_users.html',
callback: function(page, resource, request){
SQL.Query('SELECT u.name, ud.l1, ud.l2, ud.same_likes, ud.g FROM like_user_distance ud LEFT JOIN users u ON ud.to_id = u.id WHERE ud.from_id = ' + request.cookies.id + ' ORDER BY ud.l2', function(data){
resource.send(page({
'data': data
}));
});
}
},
{
path: '/recommendations/films/:film_id',
template: './template/rec_films.html',
callback: function(page, resource, request){
SQL.Query('SELECT fd.to_id, fd.l1, fd.l2, fd.same_likes, fd.g, m.title FROM like_film_distance fd LEFT JOIN movie m ON fd.to_id = m.id WHERE from_id = ' + request.params.film_id + ' ORDER BY fd.l2', function(data){
resource.send(page({
'data': data
}));
});
}
},
{
path: '/recommendations/users_by_rating',
template: './template/rec_users_r.html',
callback: function(page, resource, request){
SQL.Query('SELECT u.name, ud.l1, ud.l2 FROM rating_user_distance ud LEFT JOIN users u ON ud.to_id = u.id WHERE ud.from_id = ' + request.cookies.id + ' ORDER BY ud.l2', function(data){
resource.send(page({
'data': data
}));
});
}
},
{
path: '/recommendations/films_by_rating/:film_id',
template: './template/rec_films_r.html',
callback: function(page, resource, request){
SQL.Query('SELECT fd.to_id, fd.l1, fd.l2, m.title FROM rating_film_distance fd LEFT JOIN movie m ON fd.to_id = m.id WHERE from_id = ' + request.params.film_id + ' ORDER BY fd.l2', function(data){
resource.send(page({
'data': data
}));
});
}
},
{
path: '/recommendations_update',
template: './template/rec_films.html',
callback: function(page, resource, request){
SQL.Query('TRUNCATE TABLE like_user_distance', function(){
SQL.Query('SELECT u.id, ARRAY_AGG(l.movie_id) as likes FROM likes l LEFT JOIN users u ON l.user_id = u.id GROUP BY (u.id)', function(users){
SQL.Query('INSERT INTO like_user_distance VALUES ' + analyzeLikes(users));
});
});
SQL.Query('TRUNCATE TABLE like_film_distance', function(){
SQL.Query('SELECT l.movie_id as id, ARRAY_AGG(l.user_id) as likes FROM likes l LEFT JOIN movie m ON l.movie_id = m.id GROUP BY (l.movie_id)', function(likes){
SQL.Query('INSERT INTO like_film_distance VALUES ' + analyzeLikes(likes));
});
});
SQL.Query('TRUNCATE TABLE rating_user_distance', function(){
SQL.Query('SELECT u.id, ARRAY_AGG(r.movie_id) as iid, ARRAY_AGG(r.rating) as rating FROM ratings r LEFT JOIN users u ON r.user_id = u.id GROUP BY (u.id)', function(data){
SQL.Query('INSERT INTO rating_user_distance VALUES ' + analyzeRating(data));
});
});
SQL.Query('TRUNCATE TABLE rating_film_distance', function(){
SQL.Query('SELECT r.movie_id as id, ARRAY_AGG(r.user_id) as iid, ARRAY_AGG(r.rating) as rating FROM ratings r LEFT JOIN movie m ON r.movie_id = m.id GROUP BY (r.movie_id)', function(data){
SQL.Query('INSERT INTO rating_film_distance VALUES ' + analyzeRating(data));
});
});
resource.send('updated!');
function analyzeLikes(data)
{
var result = []
count = 0;
for (var i = 0, l = data.length; i < l; i++)
{
for (var _i = 0, _l = data.length; _i < l; _i++)
{
var analyze = getDistance(data[i].likes, data[_i].likes);
result[count] = {
from_id: data[i].id,
to_id: data[_i].id,
l1: analyze[0],
l2: analyze[1],
same_likes: analyze[2],
g: analyze[3] == 'Infinity' ? '\'Infinity\'' : analyze[3]
};
count++;
}
}
var sql = [];
for(var i = 0, l = result.length; i < l; i++)
sql[i] = '(' + result[i].from_id + ', ' + result[i].to_id + ', ' + result[i].l1 + ', ' + result[i].l2 + ', ' + result[i].g + ', ' + result[i].same_likes + ')';
return sql;
}
function analyzeRating(data)
{
var result = []
count = 0;
for (var i = 0, l = data.length; i < l; i++)
{
for (var _i = 0, _l = data.length; _i < l; _i++)
{
var analyze = getDistance(data[i].iid, data[_i].iid, data[i].rating, data[_i].rating);
result[count] = {
from_id: data[i].id,
to_id: data[_i].id,
l1: analyze[0],
l2: analyze[1]
};
count++;
}
}
var sql = [];
for(var i = 0, l = result.length; i < l; i++)
sql[i] = '(' + result[i].from_id + ', ' + result[i].to_id + ', ' + result[i].l1 + ', ' + result[i].l2 + ')';
return sql;
}
function getDistance(a, b, _a, _b)
{
var mask = false;
var l1 = l2 = 0;
if(_a && _b)
{
mask = [];
var mask_a = a.concat(b);
var mask_c = _a.concat(_b);
for(var i = 0; i < mask_a.length; i++)
mask[mask_a[i]] = mask.indexOf(mask_a[i]) != -1 ? Math.abs(mask[mask_a[i]] - mask_c[i]) : mask_c[i];
var same_f = a.filter(function(i) { return b.indexOf(i) > -1; });
for (var i = 0; i < same_f.length; i++)
{
l1 += mask[same_f[i]];
l2 += Math.pow(mask[same_f[i]], 2);
}
}
var first = a.filter(function(i) { return b.indexOf(i) < 0; }),
last = b.filter(function(i) { return a.indexOf(i) < 0; }),
full = first.concat(last);
for (var i = 0; i < full.length; i++)
{
var item = mask ? (mask[full[i]] || 0) : 1;
l1 += item;
l2 += Math.pow(item, 2);
}
l2 = Math.sqrt(l2);
var same = a.length + b.length - full.length;
var g = same / (a.length + b.length - same);
return [l1, l2, same, g];
}
}
}
],
POST: [
{
path: '/auth',
callback: function(body, resource){
//console.log(JSON.stringify(body));
if(body.login){
SQL.Query('SELECT id FROM users WHERE name = \'' + body.login + '\' LIMIT 1', function(data){
if(!data.length){
SQL.Query('INSERT INTO users (name) VALUES (\'' + body.login + '\') RETURNING id', function(data){
createCookie(data[0].id);
});
return;
}
createCookie(data[0].id);
});
return;
}
resource.redirect('/');
function createCookie(id){
var cookieAge = 1000 * 60 * 600;
resource.cookie('id', id, { maxAge: cookieAge });
resource.cookie('login', body.login, { maxAge: cookieAge });
resource.redirect('/films');
}
}
},
{
path: '/like',
callback: function(body, resource, request){
SQL.Query('INSERT INTO likes (user_id, movie_id) VALUES (' + request.cookies.id + ', ' + body.movie + ') ON CONFLICT DO NOTHING RETURNING 1', function(data){
if(!data.length)
SQL.Query('DELETE FROM likes WHERE user_id = ' + request.cookies.id + ' AND movie_id = ' + body.movie);
});
resource.redirect(request.get('referer'));
}
},
{
path: '/comment',
callback: function(body, resource, request){
SQL.Query('INSERT INTO comment (user_id, movie_id, text) VALUES (' + request.cookies.id + ', ' + body.movie + ', \'' + body.comment + '\')');
resource.redirect(request.get('referer'));
}
},
{
path: '/rating',
callback: function(body, resource, request){
SQL.Query('INSERT INTO ratings (user_id, movie_id, rating) VALUES (' + request.cookies.id + ', ' + body.movie + ', ' + body.rating + ') ON CONFLICT (user_id, movie_id) DO UPDATE SET rating = ' + body.rating);
resource.redirect(request.get('referer'));
}
}
]
}
var SQL = {
Connect: false,
Query: function(query, callback){
try{
if(!this.Connect){
this.Connect = new pg.Client('postgres://postgres:postgres@localhost/market');
//database.on('drain', database.end.bind(database));
this.Connect.connect(function(error, client, done) { //Connect.connect щито?
if(error)
throw new Error(error);
});
}
var request = this.Connect.query(query),
result = [];
request.on('error', function(error) {
throw new Error(query + ' : ' + error);
});
if(callback){
request.on('row', function(row) {
result.push(row);
});
request.on('end', function(end) {
callback(result);
});
}
}
catch(e){
console.error(e.message);
}
}
}
function System(actions){
var self = this;
var app = express(),
database = false;
app.use(express.static('statics'));
app.use(cookieParser());
var urlencodedParser = bodyParser.urlencoded({ extended: false });
self.Init = function(){
for (var i = 0, l = actions.GET.length; i < l; i++)
self.GET(actions.GET[i].path, actions.GET[i].template, actions.GET[i].callback);
for (var i = 0, l = actions.POST.length; i < l; i++)
self.POST(actions.POST[i].path, actions.POST[i].callback);
app.listen(3000, function() {
console.log('Example app listening on port 3000!');
});
}
self.GET = function(path, template, callback){
app.get(path, function (req, res) {
console.log('GET: ' + path);
var page = swig.compileFile(template);
if(callback){
if(!Object.getOwnPropertyNames(req.cookies).length){
res.redirect('/');
return;
}
callback(page, res, req);
return;
}
res.send(page());
});
}
self.POST = function(path, callback){
app.post(path, urlencodedParser, function (req, res) {
console.log('POST: ' + path);
callback(req.body, res, req);
});
}
self.Init();
}
var system = new System(Actions);