<?php
/**
 * WebSocket服务端类
 * User: fantasticbin
 * Date: 2020/1/15
 */
namespace server;

use Swoole\WebSocket\Server;
use app\common\controller\JsonReturn;
use app\common\controller\Task;
use think\facade\Cache;

class Http
{
    const HOST = '0.0.0.0';
    const PORT = 8080;

    // WebSocket对象
    public $server;
    public $fd_table;

    public function __construct()
    {
        // 创建WebSocket服务器，监听本机的所有地址并监听 8080 端口
        $this->server = new Server(self::HOST, self::PORT);

        // 设置响应html文件模式以及定义路径
        $this->server->set([
            /*'worker_num' => 2,*/
            'task_worker_num' => 2,
            'dispatch_mode' => 5,
            /*'enable_coroutine' => true,
            'task_enable_coroutine' => true,*/ // Task 启用协程，前提是enable_coroutine必须为true
            'enable_static_handler' => true,
            'document_root' => dirname(dirname(__FILE__)) . '/public/page'
        ]);

        // 设置异步AIO线程数量
        swoole_async_set([
            'thread_num' => 10,
        ]);

        // 监听启动
        $this->server->on('Start', [$this, 'onStart']);
        // 监听worker进程加载
        $this->server->on('WorkerStart', [$this, 'onWorkerStart']);
        // 监听请求并输出内容
        $this->server->on('Request', [$this, 'onRequest']);
        // 监听客户端握手成功
        $this->server->on('Open', [$this, 'onOpen']);
        // 监听客户端发送消息
        $this->server->on('Message', [$this, 'onMessage']);
        // 监听task任务执行
        $this->server->on('Task', [$this, 'onTask']);
        // 监听task任务完成
        $this->server->on('Finish', [$this, 'onFinish']);
        // 监听关闭
        $this->server->on('Close', [$this, 'onClose']);
    }

    /**
     * 监听启动，修改主进程名称，便于执行平滑重启
     */
    public function onStart()
    {
        swoole_set_process_name('http_server');
    }

    /**
     * 监听worker进程加载
     * @param $server Server WebSocket对象
     * @param $worker_id int 进程ID
     */
    public function onWorkerStart($server, $worker_id)
    {
        define('APP_PATH', __DIR__ . '/../application/');
        // 加载基础文件
        require __DIR__ . '/../thinkphp/base.php';
    }

    /**
     * 监听请求并输出内容
     * @param $request object 请求对象
     * @param $response object 响应对象
     */
    public function onRequest($request, $response)
    {
        // 过滤图标请求
        if ($request->server['request_uri'] == '/favicon.ico') {
            $response->status(404);
            $response->end();
            return;
        }

        // 把swoole接收的信息转换为thinkphp可识别的
        $_SERVER = [];
        if (isset($request->server)) {
            foreach ($request->server as $k => $v) {
                $_SERVER[strtoupper($k)] = $v;
            }
        }

        if (isset($request->header)) {
            foreach ($request->header as $k => $v) {
                $_SERVER[strtoupper($k)] = $v;
            }
        }

        // swoole对于超全局数组：$_SERVER、$_GET、$_POST、define不会释放
        $_GET = [];
        if (isset($request->get)) {
            foreach ($request->get as $k => $v) {
                $_GET[$k] = $v;
            }
        }

        $_POST = [];
        if (isset($request->post)) {
            foreach ($request->post as $k => $v) {
                $_POST[$k] = $v;
            }
        }

        // 最好全局保存一下 $this->server 对象以供thinkphp控制器中使用，此案例没用到所以省略了

        ob_start();
        // 执行应用并响应
        try {
            \think\Container::get('app', [APP_PATH])->run()->send();
        } catch (\Exception $e) {
            echo $e->getMessage();
            // todo
        }
        $res = ob_get_contents();
        ob_end_clean();
        $response->header('content-type','text/html; charset=UTF-8');
        $response->end($res);
    }

    /**
     * 监听客户端握手成功
     * @param $server Server WebSocket对象
     * @param $request object 请求对象
     */
    public function onOpen($server, $request)
    {
        $fd = $request->fd;
        $token = $request->get['token'] ?? '';    //拿到客户端用户ID
        if (!$token) {
            $server->push($fd, JsonReturn::error('请先登录！'));
            $server->close($fd);
            return;
        }

        $user_data = Cache::get($token);
        if (!$user_data) {
            $server->push($fd, JsonReturn::error('用户身份无效，请重新登录！'));
            $server->close($fd);
            return;
        }

        // 把用户id绑定到fd中
        $server->bind($fd, $user_data->id);

        // 使用table内存表用来保存客户端fd跟用户ID的关联
        if (!isset($this->fd_table)) {
            $this->fd_table = new \Swoole\Table(1024);
            $this->fd_table->column('fd', $this->fd_table::TYPE_INT, 4);
            $this->fd_table->create();
        }

        $this->fd_table->set('user' . $user_data->id, ['fd' => $fd]);
    }

    /**
     * 监听客户端发送消息
     * @param $server Server WebSocket对象
     * @param $frame object 客户端数据对象
     */
    public function onMessage($server, $frame)
    {
        $data = json_decode($frame->data, true);
        foreach ($data as $key => $value) {
            $_POST[$key] = $value;
        }

        try {
            $response = \think\Container::get('think\App', [APP_PATH])->action('index/user/sendMessage', [], 'controller', false);
        } catch (\Exception $e) {
            $exp_data = json_decode($e->getMessage(), true);
            $server->push($frame->fd, JsonReturn::error($exp_data['message']));
            return;
        }

        if (!isset($this->fd_table)) {
            $server->push($frame->fd, JsonReturn::error('发送消息暂不可用，请稍后重试！'));
            return;
        }

        if (!$this->fd_table->exist('user' . $response['take_id'])) {
            $server->push($frame->fd, JsonReturn::error('对方暂不在线，无法发送消息！后续开放留言功能~'));
            return;
        }

        $friend_fd = $this->fd_table->get('user' . $response['take_id']);

        // 发送者返回的数据
        $send_response_data = array_merge($response, ['type' => 1]);
        // 接受者返回的数据
        $take_response_date = array_merge($response, ['type' => 2]);
        if ($friend_fd) {
            $server->push($friend_fd['fd'], JsonReturn::success('推送消息成功！', $take_response_date));
            $server->push($frame->fd, JsonReturn::success('发送消息成功！', $send_response_data));
        }
    }

    /**
     * 监听task任务执行
     * @param $server Server WebSocket对象
     * @param $task object task任务数据对象
     * @return string 执行结果
     */
    public function onTask($server, $task)
    {
        // 分发task任务机制，让不同的任务，走不同的逻辑
        $my_task = new Task();
        $method = $task->data['method'];
        $result = $my_task->$method($task->data['data']);
        // 把结果告诉worker
        return $result;
    }

    /**
     * 监听task任务完成
     * @param $server Server WebSocket对象
     * @param $task_id int task任务ID
     * @param $data string onTask执行完返回的结果
     */
    public function onFinish($server, $task_id, $data)
    {}

    /**
     * 监听关闭
     * @param $server Server WebSocket对象
     * @param $client_id int 客户端连接ID
     */
    public function onClose($server, $client_id)
    {
        // 关闭时清除用户fd数据
        if (isset($this->fd_table)) $this->fd_table->del('user' . $client_id);
    }

    /**
     * 启动服务器
     */
    public function start()
    {
        $this->server->start();
    }
}

$http = new Http();
$http->start();