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WebSocket has become a common protocol in modern Web development. It can establish a two-way communication channel between the client (browser) and the server. However, unstable network environment or other unknown reasons may cause unexpected disconnection of WebSocket, which will cause great trouble to developers in development and maintenance.
Swoole is a high-performance network communication framework for PHP. It supports the WebSocket protocol and provides the WebSocket disconnection and reconnection function. This article will introduce how Swoole implements the disconnection and reconnection function of WebSocket, hoping to help developers better cope with unstable network environments.
The demand for the WebSocket disconnection and reconnection function mainly occurs in the following scenarios:
In these cases, if there is no disconnection and reconnection function, it will cause the user to log in again, reconnect and other operations, which will have a great impact on the user experience.
Swoole's support for the WebSocket protocol is very comprehensive and complete. It provides a series of event callback functions that allow us to implement these functions. WebSocket's disconnection and reconnection function.
The following are some callback functions provided by Swoole:
Among them, the onClose function is the key function to realize WebSocket disconnection and reconnection.
When the connection between the client and the server is closed, we can implement the disconnection and reconnection logic in the onClose event callback function. The specific implementation plan is as follows:
The following is a sample code that shows how to use Swoole to implement the disconnection and reconnection function of WebSocket:
<?php $server = new swoole_websocket_server("0.0.0.0", 9501); $connections = array(); //连接开启时 $server->on('open', function ($server, $request) { echo "Client {$request->fd} connected "; }); //接收到消息时 $server->on('message', function ($server, $frame) use (&$connections) { echo "Received message: {$frame->data} "; }); //连接关闭时 $server->on('close', function ($server, $fd) use (&$connections) { echo "Connection {$fd} closed "; // 遍历所有连接,找到断开的连接的标识符,并删除记录 foreach($connections as $key => $value){ if($value == $fd){ unset($connections[$key]); } } // 重连 swoole_timer_after(5000, function() use ($fd, &$connections){ if (!in_array($fd, $connections)) { $connection = new swoole_http_client('127.0.0.1', 9501); $connection->upgrade('/', function ($client) use ($fd, &$connections){ echo "Connection {$fd} reconnected "; $connections[$client->sock] = $fd; }); } }); }); $server->start();
In the above code, when the connection is closed, we use the swoole_timer_after function to implement the disconnection and reconnection function. This function indicates that a callback function will be executed after a certain time interval.
The specific operations are as follows:
Through this implementation, we can realize the disconnection and reconnection function of WebSocket when the network environment is unstable.
In modern Web development, WebSocket has become an important protocol. However, unstable network environment or other unknown reasons may cause the WebSocket connection to be abnormally disconnected, which will cause trouble to developers.
Swoole is a high-performance network communication framework that supports the WebSocket protocol and provides a series of event callback functions that allow us to implement the WebSocket disconnection and reconnection function. Through the introduction of this article, I hope it can help developers better understand and apply Swoole.
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