Arjun Patel
100 lines
3.7 KiB
JavaScript
100 lines
3.7 KiB
JavaScript
var app = require('express')();
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var server = require('http').Server(app);
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var io = require('socket.io')(server);
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var mysql = require('mysql');
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var db_config = {
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host: 'us-cdbr-iron-east-04.cleardb.net',
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user: 'bc7fa7fdf1822b',
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password: 'f62b55b3',
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database: 'heroku_99e764eb3c2ab7e'
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};
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var con;
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var port = process.env.PORT || 3000;
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server.listen(port, () => console.log('serving on port: ' + port));
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app.get('/', function (req, res) {
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res.sendFile(__dirname + '/index.html');
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});
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function handleDisconnect() {
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con = mysql.createConnection(db_config); // Recreate the connection, since
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// the old one cannot be reused.
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con.connect(function(err) { // The server is either down
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if(err) { // or restarting (takes a while sometimes).
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console.log('error when connecting to db:', err);
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setTimeout(handleDisconnect, 2000); // We introduce a delay before attempting to reconnect,
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} // to avoid a hot loop, and to allow our node script to
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}); // process asynchronous requests in the meantime.
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// If you're also serving http, display a 503 error.
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con.on('error', function(err) {
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console.log('db error', err);
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if(err.code === 'PROTOCOL_CONNECTION_LOST') { // Connection to the MySQL server is usually
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handleDisconnect(); // lost due to either server restart, or a
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} else { // connnection idle timeout (the wait_timeout
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throw err; // server variable configures this)
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}
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});
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}
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handleDisconnect();
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io.on('connection', function (socket) {
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console.log('Client connected: ' + socket.id);
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socket.on('initial', (position) => {
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console.log(position.long + ' ' + position.lat);
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//var sql = 'select * from messages where lng = 0';
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var sql = 'SELECT * FROM messages HAVING (6371393 * acos(cos(radians((?))) * cos(radians(lat)) * cos(radians(lng) - radians((?))) + sin(radians((?))) * sin(radians(lat))) < 100) ORDER BY id;'
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con.query(sql, [position.lat, position.long, position.lat], function (err, result, fields) {
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if (err) throw err;
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socket.emit('initMessages', result);
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console.log('sent all initial messages');
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});
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});
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//io.on('test', () => console.log('worked~')); // test with web page
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socket.on('newMessage', function(msg) {
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var sql = "INSERT INTO messages (userId, text, createdAt, lng, lat) VALUES (?, ?, ?, ?, ?)";
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var currTime = new Date().toString();
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con.query(sql, [msg.userId, msg.text, currTime, msg.lng, msg.lat], function(err, result) {
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if (err) throw err;
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console.log('Message sent to db!');
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var msgId = 0;
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con.query('SELECT LAST_INSERT_ID()', function(err, result) {
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if(err) throw err;
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msgId = result;
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console.log(msgId);
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});
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var uploadedMsg = {
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id: msgId,
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userId: msg.userId,
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text: msg.text,
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createdAt: currTime,
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lng: msg.lng,
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lat: msg.lat
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};
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io.emit('newMessage', uploadedMsg);
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});
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});
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socket.on('disconnect', function() {
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console.log('Client disconnected: ' + socket.id);
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});
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socket.on('error', function(err) {
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console.log('db error', err);
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if(err.code === 'PROTOCOL_CONNECTION_LOST') { // Connection to the MySQL server is usually
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handleDisconnect(); // lost due to either server restart, or a
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} else { // connnection idle timeout (the wait_timeout
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throw err; // server variable configures this)
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}
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});
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});
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