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<?phpnamespace 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<?phpnamespace 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>界面效果后台控制点击按钮1
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