如何将PHP和NodeJS与Redis同步并按顺序获取数据
我有一个示例代码,用于尝试在一个简单的聊天示例中思考如何同步nodejs和php 这是我的NodeJS服务器:如何将PHP和NodeJS与Redis同步并按顺序获取数据,php,node.js,redis,Php,Node.js,Redis,我有一个示例代码,用于尝试在一个简单的聊天示例中思考如何同步nodejs和php 这是我的NodeJS服务器: var redis = require('redis'), subscriber = redis.createClient(), publisher = redis.createClient(); //var sckio = require('socket.io').listen(8888); var http = require('http');
var redis = require('redis'),
subscriber = redis.createClient(),
publisher = redis.createClient();
//var sckio = require('socket.io').listen(8888);
var http = require('http');
var querystring = require('querystring');
var WebSocketServer = require('ws').Server
var ENCODING = 'utf8';
var tCounter = 0;
/* #################################### */
// Event on "subscribe" to any channel
subscriber.on("subscribe", function (channel, count) {
// Publish to redis server Test Message
publisher.publish("chat", "NODEJS MESSAGE");
});
// Suscrib to redis server
subscriber.on('message', function (channel, json) {
console.log('SUB: ' + channel + ' | ' + json);
console.log('PHP PUSH TO REDIS, AND NODE CAPTURE REDIS PUSH: ' + (getMicrotime(true) - tCounter));
});
subscriber.subscribe('chat'); // Subs to "mysql" channel
/*
var clients = [];
sckio.sockets.on('connection', function (socket) {
clients.push(socket);
publisher.publish("chat", "User connected");
socket.on('message', function (from, msg) {
publisher.publish("chat", msg);
clients.forEach(function (client) {
if (client === socket) return;
client.send(msg);
});
});
socket.on('disconnect', function () {
clients.splice(clients.indexOf(socket), 1);
publisher.publish("chat", "User disconnected");
});
});
*/
var wss = new WebSocketServer({port: 8888, timeout : 500});
var wsClients = [];
wss.on('connection', function(ws) {
ws.AUTH_ID = Math.random();
wsClients.push(ws);
publisher.publish("chat", "User enter");
ws.on('message', function(message) {
wsClients.forEach(function (client) {
client.send(ws.AUTH_ID + ' ' + message);
});
tCounter = getMicrotime(true);
console.log('CALL TO PHP: ' + tCounter);
PostCode('CODE TO PHP FROM NODE', function() {
wsClients.forEach(function (client) {
client.send('PHP SAVE DATA');
});
});
});
ws.on('close', function(message) {
wsClients.splice(wsClients.indexOf(ws), 1);
publisher.publish("chat", "User left");
});
ws.send('HELLO USER!');
});
function getMicrotime(get_as_float) {
var now = new Date().getTime() / 1000;
var s = parseInt(now, 10);
return (get_as_float) ? now : (Math.round((now - s) * 1000) / 1000) + ' ' + s;
}
function PostCode(codestring, callback) {
// Build the post string from an object
var post_data = querystring.stringify({
'output_format': 'json',
'js_code' : codestring
});
// An object of options to indicate where to post to
var post_options = {
host: '127.0.0.1',
port: '80',
path: '/NodeJS/chat_system/php_system.php',
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': post_data.length
}
};
// Set up the request
var post_req = http.request(post_options, function(res) {
res.setEncoding(ENCODING);
res.on('data', function (chunk) {
console.log('Response FROM PHP: ' + chunk);
if (typeof callback == 'function') {
callback(chunk);
}
});
});
// post the data
post_req.write(post_data);
post_req.end();
}
这是我的PHP服务器
require 'Predis/Autoloader.php';
Predis\Autoloader::register();
function pushToRedis($data) {
try {
$redis = new Predis\Client(array(
'scheme' => 'tcp',
'host' => '127.0.0.1',
'port' => 6379,
));
} catch (Exception $e) {
echo "Couldn't connected to Redis";
echo $e->getMessage();
return false;
}
$json = json_encode($data);
$redis->publish("chat", $json);
return true;
}
pushToRedis('PHP PUSH TO REDIS!');
header('Content-Type: application/json');
echo json_encode(array('response' => print_r(array($_REQUEST, $_SERVER), true)));
我的客户:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebSockets - Simple chat</title>
<style>
.chat { width: 400px; height: 250px; overflow-y: scroll; }
</style>
</head>
<body>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script>
var connection = new WebSocket('ws://127.0.0.1:8888');
$(document).ready(function() {
/*
var socket = io.connect('http://127.0.0.1:8888');
socket.on('message', function (data) {
alert(data);
});
socket.send('HELLO!');
*/
connection.onopen = function () {
console.log('connected!');
};
connection.onerror = function (error) {
};
connection.onmessage = function (message) {
$('.chat').append(message.data + '<br>');
$('.chat').scrollTop($('.chat')[0].scrollHeight);
};
$('input[name="text"]').on('keydown', function(e) {
if (e.keyCode === 13) {
var msg = $(this).val();
connection.send(msg);
$(this).val('').focus();
}
});
});
</script>
<div class="chat">
</div>
<input type="text" name="text">
</body>
</html>
问题在于当网络处于繁忙状态时,PHP通过Redis将响应返回给NodeJS的顺序
例如:我从de javascript客户端发送更多消息,然后,NodeJS调用PHP每一条消息,PHP将数据保存在MYSQL中,并调用Redis,NodeJS检测Redis推送并更新客户端。但是,在某些情况下,如果我从Javascript客户机循环发送一些0-10000的消息,我不会以相同的顺序回复其他客户机,如果在客户机中获得像200201300202320203这样的数字
我认为这是为了PHP延迟响应
我的问题是如何管理响应以正确的顺序更新客户端?因为这个问题可能会导致客户端以错误的顺序接收聊天消息。但是为什么要使用php,您可以使用nodejs的mysql包直接向mysql发送数据 您可以通过以下方式安装mysql软件包: npm安装mysql 连接方式: mysql=需要“mysql” connection=mysql.createConnection{ 主机:“localhost”, 用户:“用户名”, 密码:“password”, 数据库:'数据库名称', 港口:3306 }, 并使用以下命令抛出查询:
var q=connection.query'select*from表 我认为您无法控制这一点,因为您有3个变量需要考虑,1是从节点到php的延迟,2是sql写入的延迟,3是redis的延迟。我想。。。但我不是专家,我的想法是另一种。。当我从web客户端向节点发送消息时,我会等待将消息发送给聊天室的其他用户,完成后,向原始用户发送“确定”以在消息聊天室中加载消息,此方法会同步消息,但如果用户延迟太长,消息不会出现,用户可能会认为消息未发送,并尝试写入更多消息。。我认为用户体验很差。。等待响应是一个选项,但会将用户的延迟增加一倍。。