我创建了以下代码来回答大约10个站点及其上的多个功能 问题是，如果网站有超过50个用户在线，同时CPU使用率将达到100％并崩溃服务器 能不能给我任何解决方案吗？
var app = require('http').createServer()
var io = require('socket.io')(app);
var fs = require('fs');
var moment = require('moment')();
moment .zone("+-8:00");
//moment.date() dat of month
//moment.month() dat of month
var mysql = require('mysql');
var connection;
// MYSQL CONFIG
connection = mysql.createConnection({
host: '',
user: '',
password: '@@',
database: 'nodejs'
});
// listen port 8084
// please open this port on firewall and iptables
app.listen(8084);
var xsocket = io.listen(app);
console.log('Listen On Port 8084 ' + connection);
var dblists = [];
var users = {};
var domains_tmp;
// get db list
connection.query('SELECT db_name, domain_name FROM tbl_dblist order by id asc ;', function (err, rows, fields) {
// console.log('Connection result error ' + err);
// console.log('no of records is ' + rows.length);
// send data to all servers
var count = -1;
rows.forEach(function (entry) {
count++;
dblists[entry["domain_name"]] = {
dbname: entry["db_name"], cn: mysql.createConnection({
host: '',
user: '',
password: '',
database: entry["db_name"]
})
};
})
// console.log("DBLIST : ", dblists);
});
// handle request from clients
function handler(conn,conn_id) {
if(!conn.connected)
return;
var i = String(users[conn_id].domain);
// when db for domain not defined
try {
if (i.length <= 0 || i == "undefined")
return;
if (dblists[i].dbname.length == 0) {
return;
}
dblists[i].cn.query('SELECT max(id) as id FROM tbl_transaction ;', function (err, maxrow, fields) {
// send data to Connected Client
if (maxrow.length > 0) {
//console.log("length ",maxrow.length);
if (maxrow[0].id > users[conn_id].maxrows) {
var last_id1 = maxrow[0].id;
var last_id = users[conn_id].maxrows;
// get last 20 record from table
dblists[i].cn.query('SELECT tbl_user.username as who, tbl_transaction.amount,tbl_transaction.date,tbl_transaction.note FROM '+
'tbl_transaction inner join tbl_user on tbl_user.user_id = tbl_transaction.user_id '+
' where tbl_transaction.id > ' + last_id + ' and tbl_transaction.id <=' + last_id1 + ' order by tbl_transaction.id desc limit 20;', function (err, rows, fields) {
// console.log('Connection result error ' + err);
//console.log('no of records is ' + rows.length);
if(!conn.connected)
return;
// send data to Connected Client
conn.emit("alert", rows);
// console.log(rows);
});
users[conn_id].maxrows = maxrow[0].id;
}
}
});
// repeat data fetching every 0.5 seconds
setTimeout(function () {
handler(conn,conn_id);
}
, 1000);
}
catch (ex) {
}
finally {
}
}
function mktime() {
var d = new Date(),
r = arguments,
i = 0,
e = ['Hours', 'Minutes', 'Seconds', 'Month', 'Date', 'FullYear'];
for (i = 0; i < e.length; i++) {
if (typeof r[i] === 'undefined') {
r[i] = d['get' + e[i]]();
r[i] += (i === 3); // +1 to fix JS months.
} else {
r[i] = parseInt(r[i], 10);
if (isNaN(r[i])) {
return false;
}
}
}
// Map years 0-69 to 2000-2069 and years 70-100 to 1970-2000.
r[5] += (r[5] >= 0 ? (r[5] <= 69 ? 2e3 : (r[5] <= 100 ? 1900 : 0)) : 0);
// Set year, month (-1 to fix JS months), and date.
// !This must come before the call to setHours!
d.setFullYear(r[5], r[3] - 1, r[4]);
// Set hours, minutes, and seconds.
d.setHours(r[0], r[1], r[2]);
// Divide milliseconds by 1000 to return seconds and drop decimal.
// Add 1 second if negative or it'll be off from PHP by 1 second.
return (d.getTime() / 1e3 >> 0) - (d.getTime() < 0);
}
var i=1654;
function onlineu(socks,connection_online) {
// die function when the client disconnected
if (!socks.connected)
return;
var return_data = {played:0,total:0,players:0,today:0};
dblists[connection_online].cn.query('Select sum(playnum) as cnt,sum(amount) as mnt from tbl_user ;', function (err, rows, fields) {
if (rows.length > 0) {
console.log("Rows :", rows[0].cnt, rows[0].mnt);
return_data.played = rows[0].cnt;
return_data.total = rows[0].mnt;
}
});
dblists[connection_online].cn.query('select count(user_id) as players from tbl_user ;', function (err, rows, fields) {
if (rows.length > 0) {
console.log("Rows :", rows[0].players);
return_data.players = rows[0].players;
}
});
var d=moment.date();
var m=moment.month()+1;
var begin=mktime(0,0,0, m, d );
var end=mktime(23,59,59,m,d);
dblists[connection_online].cn.query('Select count(id) as cnt,sum(amount) as today from tbl_transaction where date between '+ begin+' and '+ end+' ;', function (err, rows, fields) {
if (rows.length > 0) {
console.log("Rows :", rows[0].today);
return_data.today = rows[0].today;
}
});
// die function when the client disconnected
if (!socks.connected)
return;
//console.log("online Users", return_data);
socks.emit("online", return_data);
setTimeout(function () {
onlineu(socks,domains_tmp);
}, 1000);
}
// waiting for client html/js loaded
xsocket.set('authorization', function (handshakeData, callback) {
query = handshakeData._query;
if (query.domain == undefined || query.domain.length == 0) {
console.log("No Domain Specified, Return False");
return false;
}
domains_tmp = query.domain;
callback(null, true);
});
xsocket.on('connection', function (conn) {
console.log("New Client : " + conn.id);
console.log("New Client Domain : " + domains_tmp);
// Register Client Domain
users[conn.id] = {id: conn.id, domain: domains_tmp, maxrows: 0};
onlineu(conn,domains_tmp);
handler(conn, conn.id);
conn.on('disconnect', function (conn) {
// Do Some Thing
});
});
// end
由于
答案 0 :(得分：0)
如果要在单个IP /服务器后面运行多个node.js应用程序，最好的办法是使用nginx，varnish，ha-proxy等服务器来反向代理对应用程序的请求。 Nginx在此角色中运行良好，也可用于缓存，SSL终止，spdy，pagespeed和其他增强功能。最近的nginx版本支持websockets。
注意：这确实是一个大杂烩的建议，因为你的问题非常广泛，而且方法相当草率......一般将你的逻辑分解为可用于的功能模块对物体采取行动。从这里，您可以更好地测试和撰写应用程序。