websocket的消息推送只能固定在某一个页面吗？

Posted 2023-05-03

参考技术A

不会固定某一个页面一般都是用多 frame 来实现，即建立 WebSocket 是单独的一个 frame，且此 frame 不随页面切换而刷新，至于其他需要在页面切换时刷新的元素放在其他 frame 里。

websocket 对前端其实还蛮简单(如果以前有对ajax的经验的话)，与平时ajax的区别大多就是在事件监听上的不同，在onMessage回调里拿到你想要的数据后就与ajax无异了，主要是后端的推送数据方式有比较大的改变。

后端推送数据方式就有点类似于 tcp 的方式，搭配框架实现起来还蛮方便的，如果你了解php，建议你后端使用 php workerman，当然websocket其实只能实现在线推送，推送方面类似的比如 PWA 也不错，不过学习成本比较高。

基于Hyperf实现RabbitMQ+WebSocket消息推送

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介绍

基于 Hyperf+ WebSocket +RabbitMQ 实现的一个简单大屏幕的消息推送。

思路

利用 WebSocket 协议让客户端和服务器端保持有状态的长链接，

保存链接上来的客户端 id。订阅发布者发布的消息针对已保存的客户端 id 进行广播消息。

WebSocket 服务

composer require hyperf/websocket-server

配置文件 [config/autoload/server.php]

<?phpreturn [ 'mode' => SWOOLE_PROCESS, 'servers' => [ [ 'name' => 'http', 'type' => Server::SERVER_HTTP, 'host' => '0.0.0.0', 'port' => 11111, 'sock_type' => SWOOLE_SOCK_TCP, 'callbacks' => [ SwooleEvent::ON_REQUEST => [Hyperf\HttpServer\Server::class, 'onRequest'], ], ], [ 'name' => 'ws', 'type' => Server::SERVER_WEBSOCKET, 'host' => '0.0.0.0', 'port' => 12222, 'sock_type' => SWOOLE_SOCK_TCP, 'callbacks' => [ SwooleEvent::ON_HAND_SHAKE => [Hyperf\WebSocketServer\Server::class, 'onHandShake'], SwooleEvent::ON_MESSAGE => [Hyperf\WebSocketServer\Server::class, 'onMessage'], SwooleEvent::ON_CLOSE => [Hyperf\WebSocketServer\Server::class, 'onClose'], ], ], ],

WebSocket 服务器端代码示例

<?phpdeclare(strict_types=1);/** * This file is part of Hyperf. * * @link https://www.hyperf.io * @document https://doc.hyperf.io * @contact [e-mail] * @license https://github.com/hyperf-cloud/hyperf/blob/master/LICENSE */namespace App\Controller;use Hyperf\Contract\OnCloseInterface;use Hyperf\Contract\OnMessageInterface;use Hyperf\Contract\OnOpenInterface;use Swoole\Http\Request;use Swoole\Server;use Swoole\Websocket\Frame;use Swoole\WebSocket\Server as WebSocketServer;class WebSocketController extends Controller implements OnMessageInterface, OnOpenInterface, OnCloseInterface{ /** * 发送消息 * @param WebSocketServer $server * @param Frame $frame */ public function onMessage(WebSocketServer $server, Frame $frame): void{ //心跳刷新缓存 $redis = $this->container->get(\Redis::class); //获取所有的客户端id $fdList = $redis->sMembers('websocket_sjd_1'); //如果当前客户端在客户端集合中,就刷新 if (in_array($frame->fd, $fdList)) { $redis->sAdd('websocket_sjd_1', $frame->fd); $redis->expire('websocket_sjd_1', 7200); } $server->push($frame->fd, 'Recv: ' . $frame->data); } /** * 客户端失去链接 * @param Server $server * @param int $fd * @param int $reactorId */ public function onClose(Server $server, int $fd, int $reactorId): void{ //删掉客户端id $redis = $this->container->get(\Redis::class); //移除集合中指定的value $redis->sRem('websocket_sjd_1', $fd); var_dump('closed'); } /** * 客户端链接 * @param WebSocketServer $server * @param Request $request */ public function onOpen(WebSocketServer $server, Request $request): void{ //保存客户端id $redis = $this->container->get(\Redis::class); $res1 = $redis->sAdd('websocket_sjd_1', $request->fd); var_dump($res1); $res = $redis->expire('websocket_sjd_1', 7200); var_dump($res); $server->push($request->fd, 'Opened'); }}

WebSocket 前端代码

function WebSocketTest() { if ("WebSocket" in window) { console.log("您的浏览器支持 WebSocket!"); var num = 0 // 打开一个 web socket var ws = new WebSocket("ws://127.0.0.1:12222"); ws.onopen = function () { // Web Socket 已连接上，使用 send() 方法发送数据 //alert("数据发送中..."); //ws.send("发送数据"); }; window.setInterval(function () { //每隔5秒钟发送一次心跳，避免websocket连接因超时而自动断开 var ping = {"type": "ping"}; ws.send(JSON.stringify(ping)); }, 5000); ws.onmessage = function (evt) { var d = JSON.parse(evt.data); console.log(d); if (d.code == 300) { $(".address").text(d.address) } if (d.code == 200) { var v = d.data console.log(v); num++ var str = `<div class="item"> <p>${v.recordOutTime}</p> <p>${v.userOutName}</p> <p>${v.userOutNum}</p> <p>${v.doorOutName}</p> </div>` $(".tableHead").after(str) if (num > 7) { num-- $(".table .item:nth-last-child(1)").remove() } } }; ws.error = function (e) { console.log(e) alert(e) } ws.onclose = function () { // 关闭 websocket alert("连接已关闭..."); }; } else { alert("您的浏览器不支持 WebSocket!"); }}

AMQP 组件

composer require hyperf/amqp

配置文件 [config/autoload/amqp.php]

<?phpreturn [ 'default' => [ 'host' => 'localhost', 'port' => 5672, 'user' => 'guest', 'password' => 'guest', 'vhost' => '/', 'pool' => [ 'min_connections' => 1, 'max_connections' => 10, 'connect_timeout' => 10.0, 'wait_timeout' => 3.0, 'heartbeat' => -1, ], 'params' => [ 'insist' => false, 'login_method' => 'AMQPLAIN', 'login_response' => null, 'locale' => 'en_US', 'connection_timeout' => 3.0, 'read_write_timeout' => 6.0, 'context' => null, 'keepalive' => false, 'heartbeat' => 3, ], ],];

MQ 消费者代码

<?phpdeclare(strict_types=1);namespace App\Amqp\Consumer;use Hyperf\Amqp\Annotation\Consumer;use Hyperf\Amqp\Message\ConsumerMessage;use Hyperf\Amqp\Result;use Hyperf\Server\Server;use Hyperf\Server\ServerFactory;/** * @Consumer(exchange="hyperf", routingKey="hyperf", queue="hyperf", nums=1) */class DemoConsumer extends ConsumerMessage{ /** * rabbmitMQ消费端代码 * @param $data * @return string */ public function consume($data): string{ print_r($data); //获取集合中所有的value $redis = $this->container->get(\Redis::class); $fdList=$redis->sMembers('websocket_sjd_1'); $server=$this->container->get(ServerFactory::class)->getServer()->getServer(); foreach($fdList as $key=>$v){ if(!empty($v)){ $server->push((int)$v, $data); } } return Result::ACK; }}

控制器代码

/** * test * @return array */public function test(){ $data = array( 'code' => 200, 'data' => [ 'userOutName' => 'ccflow', 'userOutNum' => '9999', 'recordOutTime' => date("Y-m-d H:i:s", time()), 'doorOutName' => '教师公寓', ] ); $data = \GuzzleHttp\json_encode($data); $message = new DemoProducer($data); $producer = ApplicationContext::getContainer()->get(Producer::class); $result = $producer->produce($message); var_dump($result); $user = $this->request->input('user', 'Hyperf'); $method = $this->request->getMethod(); return [ 'method' => $method, 'message' => "{$user}.", ];}

最终效果

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