最近使用 swoole 做了项目,里面设计推送信息给界面前端,和无登陆用户的状态监控,以下是本人从中获取的一点心得,有改进的地方请留言评论。
需求分析
我们假设有一个需求,我在后端点击按钮1,首页弹出“后端触发了按钮1”。后端点了按钮2,列表页弹出“后端触发了按钮2”。做到根据不同场景推送到不同页面。
代码思路
Swoole fd
客户端浏览器打开或者刷新界面,在swoole服务会生成一个进程句柄 fd ,每次浏览器页面有打开链接websocket的js代码,便会生成,每次刷新的时候,会关闭之前打开的 fd,重新生成一个新的,关闭界面的时候会生成一个新的。swoole的 fd生成规则是从1开始递增。
Redis Hash存储 fd
我们建立一个key为swoole:fds redis哈希类型数据,fd 为hash的字段,每个字段的值我们存储前端websocket请求的url参数信息(根据业务复杂度自己灵活变通,我在项目中会在url带上sessionId)。每次链接打开swoole服务的时候我们存储其信息,每次关闭页面时候我们清除其字段。在redis存储如下
-
触发分场景推送
在界面上当进行了触发操作的时候,通过后台curl请求swoole http服务,swoole http服务根据你向我传递的参数分发给对应的逻辑处理。如curl请求
127.0.0.1:9502page=back&func=pushHomeLogic&token=123456
我们可以根据传入的func参数,在后台分发给对应逻辑处理。如分发给pushHomeLogic方法。在其里面实现自己的逻辑。为防止过多的if else 以及 foreach 操作,我们采用的是闭包,call_user_func等方法实现如下public function onRequest($request,$response) { if ($this->checkAccess("", $request)) { $param = $request->get; // 分发处理请求逻辑 if (isset($param['func'])) { if (method_exists($this,$param['func'])) { call_user_func([$this,$param['func']],$request); } } } }// 往首页推送逻辑处理 public function pushHomeLogic($request) { $callback = function (array $aContent,int $fd,SwooleDemo $oSwoole)use($request) { if ($aContent && $aContent['page'] == "home") { $aRes['message'] = "后端按了按钮1"; $aRes['code'] = "200"; $oSwoole::$server->push($fd,xss_json($aRes)); } }; $this->eachFdLogic($callback); }
完整代码
swool脚本代码逻辑
<?php
namespace App\Console\Commands;
use Closure;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Redis;
class SwooleDemo extends Command
{
// 命令名称
protected $signature = 'swoole:demo';
// 命令说明
protected $description = '这是关于swoole websocket的一个测试demo';
// swoole websocket服务
private static $server = null;
public function __construct()
{
parent::__construct();
}
// 入口
public function handle()
{
$this->redis = Redis::connection('websocket');
$server = self::getWebSocketServer();
$server->on('open',[$this,'onOpen']);
$server->on('message', [$this, 'onMessage']);
$server->on('close', [$this, 'onClose']);
$server->on('request', [$this, 'onRequest']);
$this->line("swoole服务启动成功 ...");
$server->start();
}
// 获取服务
public static function getWebSocketServer()
{
if (!(self::$server instanceof \swoole_websocket_server)) {
self::setWebSocketServer();
}
return self::$server;
}
// 服务处始设置
protected static function setWebSocketServer():void
{
self::$server = new \swoole_websocket_server("0.0.0.0", 9502);
self::$server->set([
'worker_num' => 1,
'heartbeat_check_interval' => 60, // 60秒检测一次
'heartbeat_idle_time' => 121, // 121秒没活动的
]);
}
// 打开swoole websocket服务回调代码
public function onOpen($server, $request)
{
if ($this->checkAccess($server, $request)) {
self::$server->push($request->fd,xss_json(["code"=>200,"message"=>"打开swoole服务成功"]));
}
}
// 给swoole websocket 发送消息回调代码
public function onMessage($server, $frame)
{
}
// http请求swoole websocket 回调代码
public function onRequest($request,$response)
{
if ($this->checkAccess("", $request)) {
$param = $request->get;
// 分发处理请求逻辑
if (isset($param['func'])) {
if (method_exists($this,$param['func'])) {
call_user_func([$this,$param['func']],$request);
}
}
}
}
// websocket 关闭回调代码
public function onClose($serv,$fd)
{
$this->redis->hdel('swoole:fds', $fd);
$this->line("客户端 {$fd} 关闭");
}
// 校验客户端连接的合法性,无效的连接不允许连接
public function checkAccess($server, $request):bool
{
$bRes = true;
if (!isset($request->get) || !isset($request->get['token'])) {
self::$server->close($request->fd);
$this->line("接口验证字段不全");
$bRes = false;
} else if ($request->get['token'] != 123456) {
$this->line("接口验证错误");
$bRes = false;
}
$this->storeUrlParamToRedis($request);
return $bRes;
}
// 将每个界面打开websocket的url 存储起来
public function storeUrlParamToRedis($request):void
{
// 存储请求url带的信息
$sContent = json_encode(
[
'page' => $request->get['page'],
'fd' => $request->fd,
], true);
$this->redis->hset("swoole:fds", $request->fd, $sContent);
}
/**
* @param $request
* @see 循环逻辑处理
*/
public function eachFdLogic(Closure $callback = null)
{
foreach (self::$server->connections as $fd) {
if (self::$server->isEstablished($fd)) {
$aContent = json_decode($this->redis->hget("swoole:fds",$fd),true);
$callback($aContent,$fd,$this);
} else {
$this->redis->hdel("swoole:fds",$fd);
}
}
}
// 往首页推送逻辑处理
public function pushHomeLogic($request)
{
$callback = function (array $aContent,int $fd,SwooleDemo $oSwoole)use($request) {
if ($aContent && $aContent['page'] == "home") {
$aRes['message'] = "后端按了按钮1";
$aRes['code'] = "200";
$oSwoole::$server->push($fd,xss_json($aRes));
}
};
$this->eachFdLogic($callback);
}
// 往列表页推送逻辑处理
public function pushListLogic($request)
{
$callback = function (array $aContent,int $fd,SwooleDemo $oSwoole)use($request) {
if ($aContent && $aContent['page'] == "list") {
$aRes['message'] = "后端按了按钮2";
$aRes['code'] = "200";
$oSwoole::$server->push($fd,xss_json($aRes));
}
};
$this->eachFdLogic($callback);
}
// 启动websocket服务
public function start()
{
self::$server->start();
}
}
控制器代码
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Redis;
class TestController extends Controller
{
// 首页
public function home()
{
return view("home");
}
// 列表
public function list()
{
return view("list");
}
// 后端控制
public function back()
{
if (request()->method() == 'POST') {
$this->curl_get($this->getUrl());
return json_encode(['code'=>200,"message"=>"成功"]);
} else {
return view("back");
}
}
// 获取要请求swoole websocet服务地址
public function getUrl():string
{
// 域名 端口 请求swoole服务的方法
$sBase = request()->server('HTTP_HOST');
$iPort = 9502;
$sFunc = request()->post('func');
$sPage = "back";
return $sBase.":".$iPort."?func=".$sFunc."&token=123456&page=".$sPage;
}
// curl 推送
public function curl_get(string $url):string
{
$ch_curl = curl_init();
curl_setopt ($ch_curl, CURLOPT_TIMEOUT_MS, 3000);
curl_setopt($ch_curl, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt ($ch_curl, CURLOPT_HEADER,false);
curl_setopt($ch_curl, CURLOPT_HTTPGET, 1);
curl_setopt($ch_curl, CURLOPT_RETURNTRANSFER,true);
curl_setopt ($ch_curl, CURLOPT_URL,$url);
$str = curl_exec($ch_curl);
curl_close($ch_curl);
return $str;
}
}
页面js代码
后端控制页
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>后端界面</title>
<meta name=viewport content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
</head>
<body>
<button class="push" data-func="pushHomeLogic">按钮1</button>
<button class="push" data-func="pushListLogic">按钮2</button>
</body>
<script src="{{ asset("/vendor/tw/global/jQuery/jquery-2.2.3.min.js")}} "></script>
<script>
$(function () {
$(".push").on('click',function(){
var func = $(this).attr('data-func').trim();
ajaxGet(func)
})
function ajaxGet(func) {
url = "{{route('back')}}";
token = "{{csrf_token()}}";
$.ajax({
url: url,
type: 'post',
dataType: "json",
data:{func:func,_token:token},
error: function (data) {
alert("服务器繁忙, 请联系管理员!");
return;
},
success: function (result) {
},
})
}
})
</script>
</html>
首页
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>swoole首页</title>
<meta name=viewport content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
</head>
<body>
<h1>这是首页</h1>
</body>
<script>
var ws;//websocket实例
var lockReconnect = false;//避免重复连接
var wsUrl = 'ws://{{$_SERVER["HTTP_HOST"]}}:9502?page=home&token=123456';
function initEventHandle() {
ws.onclose = function () {
reconnect(wsUrl);
};
ws.onerror = function () {
reconnect(wsUrl);
};
ws.onopen = function () {
//心跳检测重置
heartCheck.reset().start();
};
ws.onmessage = function (event) {
//如果获取到消息,心跳检测重置
//拿到任何消息都说明当前连接是正常的
var data = JSON.parse(event.data);
if (data.code == 200) {
console.log(data.message)
}
heartCheck.reset().start();
}
}
createWebSocket(wsUrl);
/**
* 创建链接
* @param url
*/
function createWebSocket(url) {
try {
ws = new WebSocket(url);
initEventHandle();
} catch (e) {
reconnect(url);
}
}
function reconnect(url) {
if(lockReconnect) return;
lockReconnect = true;
//没连接上会一直重连,设置延迟避免请求过多
setTimeout(function () {
createWebSocket(url);
lockReconnect = false;
}, 2000);
}
//心跳检测
var heartCheck = {
timeout: 60000,//60秒
timeoutObj: null,
serverTimeoutObj: null,
reset: function(){
clearTimeout(this.timeoutObj);
clearTimeout(this.serverTimeoutObj);
return this;
},
start: function(){
var self = this;
this.timeoutObj = setTimeout(function(){
//这里发送一个心跳,后端收到后,返回一个心跳消息,
//onmessage拿到返回的心跳就说明连接正常
ws.send("heartbeat");
self.serverTimeoutObj = setTimeout(function(){//如果超过一定时间还没重置,说明后端主动断开了
ws.close();//如果onclose会执行reconnect,我们执行ws.close()就行了.如果直接执行reconnect 会触发onclose导致重连两次
}, self.timeout);
}, this.timeout);
},
header:function(url) {
window.location.href=url
}
}
</script>
</html>
列表页面
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>swoole列表页</title>
<meta name=viewport content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
</head>
<body>
<h1>swoole列表页</h1>
</body>
<script>
var ws;//websocket实例
var lockReconnect = false;//避免重复连接
var wsUrl = 'ws://{{$_SERVER["HTTP_HOST"]}}:9502?page=list&token=123456';
function initEventHandle() {
ws.onclose = function () {
reconnect(wsUrl);
};
ws.onerror = function () {
reconnect(wsUrl);
};
ws.onopen = function () {
//心跳检测重置
heartCheck.reset().start();
};
ws.onmessage = function (event) {
//如果获取到消息,心跳检测重置
//拿到任何消息都说明当前连接是正常的
var data = JSON.parse(event.data);
if (data.code == 200) {
console.log(data.message)
}
heartCheck.reset().start();
}
}
createWebSocket(wsUrl);
/**
* 创建链接
* @param url
*/
function createWebSocket(url) {
try {
ws = new WebSocket(url);
initEventHandle();
} catch (e) {
reconnect(url);
}
}
function reconnect(url) {
if(lockReconnect) return;
lockReconnect = true;
//没连接上会一直重连,设置延迟避免请求过多
setTimeout(function () {
createWebSocket(url);
lockReconnect = false;
}, 2000);
}
//心跳检测
var heartCheck = {
timeout: 60000,//60秒
timeoutObj: null,
serverTimeoutObj: null,
reset: function(){
clearTimeout(this.timeoutObj);
clearTimeout(this.serverTimeoutObj);
return this;
},
start: function(){
var self = this;
this.timeoutObj = setTimeout(function(){
//这里发送一个心跳,后端收到后,返回一个心跳消息,
//onmessage拿到返回的心跳就说明连接正常
ws.send("heartbeat");
self.serverTimeoutObj = setTimeout(function(){//如果超过一定时间还没重置,说明后端主动断开了
ws.close();//如果onclose会执行reconnect,我们执行ws.close()就行了.如果直接执行reconnect 会触发onclose导致重连两次
}, self.timeout);
}, this.timeout);
},
header:function(url) {
window.location.href=url
}
}
</script>
</html>
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