workerman/Core/Master.php

<?php 
namespace WORKERMAN\Core;
error_reporting(E_ALL);
ini_set('display_errors', 'on');
ini_set('limit_memory','512M');
date_default_timezone_set('Asia/Shanghai');

require_once WORKERMAN_ROOT_DIR . 'Core/Lib/Checker.php';
require_once WORKERMAN_ROOT_DIR . 'Core/Lib/Config.php';
require_once WORKERMAN_ROOT_DIR . 'Core/Lib/Task.php';
require_once WORKERMAN_ROOT_DIR . 'Core/Lib/Log.php';

/**
 * 
 * 主进程
 * 
 * @package Core
 * 
* @author walkor <worker-man@qq.com>
 * <b>使用示例:</b>
 * <pre>
 * <code>
 * Master::run();
 * <code>
 * </pre>
 * 
 */
class Master
{
    /**
     * 版本
     * @var string
     */
    const VERSION = '2.0.1';
    
    /**
     * 服务名
     * @var string
     */
    const NAME = 'WorkerMan';
    
    /**
     * 服务状态 启动中
     * @var integer
     */ 
    const STATUS_STARTING = 1;
    
    /**
     * 服务状态 运行中
     * @var integer
     */
    const STATUS_RUNNING = 2;
    
    /**
     * 服务状态 关闭中
     * @var integer
     */
    const STATUS_SHUTDOWN = 4;
    
    /**
     * 服务状态 平滑重启中
     * @var integer
     */
    const STATUS_RESTARTING_WORKERS = 8;
    
    /**
     * 整个服务能够启动的最大进程数
     * @var integer
     */
    const SERVER_MAX_WORKER_COUNT = 5000;
    
    /**
     * 单个进程打开文件数限制
     * @var integer
     */
    const MIN_SOFT_OPEN_FILES = 10000;
    
    /**
     * 单个进程打开文件数限制 硬性限制
     * @var integer
     */
    const MIN_HARD_OPEN_FILES = 10000;
    
    /**
     * 共享内存中用于存储主进程统计信息的变量id
     * @var integer
     */
    const STATUS_VAR_ID = 1;
    
    /**
     * 发送停止命令多久后worker没退出则发送sigkill信号
     * @var integer
     */
    const KILL_WORKER_TIME_LONG = 4;
    
    /**
     * 用于保存所有子进程pid ['worker_name1'=>[pid1=>pid1,pid2=>pid2,..], 'worker_name2'=>[pid3,..], ...]
     * @var array
     */
    protected static $workerPids = array();
    
    /**
     * 服务的状态，默认是启动中
     * @var integer
     */
    protected static $serverStatus = self::STATUS_STARTING;
    
    /**
     * 用来监听端口的Socket数组，用来fork worker使用
     * @var array
     */
    protected static $listenedSockets = array();
    
    /**
     * 要重启的worker的pid数组 [pid1=>time_stamp, pid2=>time_stamp, ..]
     * @var array
     */
    protected static $workerToRestart = array();
    
    /**
     * 共享内存resource id
     * @var resource
     */
    protected static $shmId = 0;
    
    /**
     * 消息队列 resource id
     * @var resource
     */
    protected static $queueId = 0;
    
    /**
     * master进程pid
     * @var integer
     */
    protected static $masterPid = 0;
    
    /**
     * server统计信息 ['start_time'=>time_stamp, 'worker_exit_code'=>['worker_name1'=>[code1=>count1, code2=>count2,..], 'worker_name2'=>[code3=>count3,...], ..] ]
     * @var array
     */
    protected static $serverStatusInfo = array(
        'start_time' => 0,
        'worker_exit_code' => array(),
    );
    
    /**
     * 服务运行
     * @return void
     */
    public static function run()
    {
        self::notice("Server is starting ...", true);
        // 初始化
        self::init();
        // 检查环境
        self::checkEnv();
        // 变成守护进程
        self::daemonize();
        // 保存进程pid
        self::savePid();
        // 安装信号
        self::installSignal();
        // 创建监听套接字
        self::createSocketsAndListen();
        // 创建worker进程
        self::createWorkers();
        
        self::notice("Server start success ...", true);
        // 标记sever状态为运行中...
        self::$serverStatus = self::STATUS_RUNNING;
        // 关闭标准输出
        self::resetStdFd();
        // 主循环
        self::loop();
    }
    
    
    /**
     * 初始化 配置、进程名、共享内存、消息队列等
     * @return void
     */
    public static function init()
    {
        // 获取配置文件
        $config_path = Lib\Config::instance()->filename;
    
        // 设置进程名称，如果支持的话
        self::setProcessTitle(self::NAME.':master with-config:' . $config_path);
        
        // 初始化共享内存消息队列
        if(extension_loaded('sysvmsg') && extension_loaded('sysvshm'))
        {
            self::$shmId = shm_attach(IPC_KEY, DEFAULT_SHM_SIZE, 0666);
            self::$queueId = msg_get_queue(IPC_KEY, 0666);
            msg_set_queue(self::$queueId,array('msg_qbytes'=>65535));
        }
    }
    
    /**
     * 检查环境配置
     * @return void
     */
    public static function checkEnv()
    {
        Lib\Checker::checkPidFile();
        
        // 检查扩展支持情况
        Lib\Checker::checkExtension();
        
        // 检查函数禁用情况
        Lib\Checker::checkDisableFunction();
        
        // 检查log目录是否可读
        Lib\Log::init();
        
        // 检查配置和语法错误等
        Lib\Checker::checkWorkersConfig();
        
        // 检查文件限制
        Lib\Checker::checkLimit();
    }
    
    /**
     * 使之脱离终端，变为守护进程
     * @return void
     */
    protected static function daemonize()
    {
        // 设置umask
        umask(0);
        // fork一次
        $pid = pcntl_fork();
        if(-1 == $pid)
        {
            // 出错退出
            exit("Daemonize fail ,can not fork");
        }
        elseif($pid > 0)
        {
            // 父进程，退出
            exit(0);
        }
        // 子进程使之成为session leader
        if(-1 == posix_setsid())
        {
            // 出错退出
            exit("Daemonize fail ,setsid fail");
        }
    
        // 再fork一次
        $pid2 = pcntl_fork();
        if(-1 == $pid2)
        {
            // 出错退出
            exit("Daemonize fail ,can not fork");
        }
        elseif(0 !== $pid2)
        {
            // 结束第一子进程，用来禁止进程重新打开控制终端
            exit(0);
        }
    
        // 记录server启动时间
        self::$serverStatusInfo['start_time'] = time();
    }
    
    /**
     * 保存主进程pid
     */
    public static function savePid()
    {
        // 保存在变量中
        self::$masterPid = posix_getpid();
        
        // 保存到文件中，用于实现停止、重启
        if(false === @file_put_contents(WORKERMAN_PID_FILE, self::$masterPid))
        {
            exit("\033[31;40mCan not save pid to pid-file(" . WORKERMAN_PID_FILE . ")\033[0m\n\n\033[31;40mServer start fail\033[0m\n\n");
        }
        
        // 更改权限
        chmod(WORKERMAN_PID_FILE, 0644);
    }
    
    /**
     * 获取主进程pid
     * @return int
     */
    public static function getMasterPid()
    {
        return self::$masterPid;
    }
    
    /**
     * 根据配置文件，创建监听套接字
     * @return void
     */
    protected static function createSocketsAndListen()
    {
        // 循环读取配置创建socket
        foreach (Lib\Config::get('workers') as $worker_name=>$config)
        {
            if(isset($config['socket']))
            {
                $flags = $config['socket']['protocol'] == 'udp' ? STREAM_SERVER_BIND : STREAM_SERVER_BIND | STREAM_SERVER_LISTEN;
                $ip = isset($config['socket']['ip']) ? $config['socket']['ip'] : "0.0.0.0";
                $error_no = 0;
                $error_msg = '';
                // 创建监听socket
                self::$listenedSockets[$worker_name] = stream_socket_server("{$config['socket']['protocol']}://{$ip}:{$config['socket']['port']}", $error_no, $error_msg, $flags);
                if(!self::$listenedSockets[$worker_name])
                {
                    Lib\Log::add("can not create socket {$config['socket']['protocol']}://{$ip}:{$config['socket']['port']} info:{$error_no} {$error_msg}\tServer start fail");
                    exit("\n\033[31;40mcan not create socket {$config['socket']['protocol']}://{$ip}:{$config['socket']['port']} info:{$error_no} {$error_msg}\033[0m\n\n\033[31;40mServer start fail\033[0m\n\n");
                }
            }
        }
    }
    
    
    /**
     * 根据配置文件创建Workers
     * @return void
     */
    protected static function createWorkers()
    {
        // 循环读取配置创建一定量的worker进程
        foreach (Lib\Config::get('workers') as $worker_name=>$config)
        {
            // 初始化
            if(empty(self::$workerPids[$worker_name]))
            {
                self::$workerPids[$worker_name] = array();
            }
    
            while(count(self::$workerPids[$worker_name]) < $config['children_count'])
            {
                $pid = self::forkOneWorker($worker_name);
                // 子进程退出
                if($pid == 0)
                {
                    self::notice("CHILD EXIT ERR");
                }
            }
        }
    }
    
    /**
     * 创建一个worker进程
     * @param string $worker_name worker的名称
     * @return int 父进程:>0得到新worker的pid ;<0 出错; 子进程:始终为0
     */
    protected static function forkOneWorker($worker_name)
    {
        // 创建子进程
        $pid = pcntl_fork();
        
        // 先处理收到的信号
        pcntl_signal_dispatch();
        
        // 父进程
        if($pid > 0)
        {
            // 初始化master的一些东东
            self::$workerPids[$worker_name][$pid] = $pid;
            // 更新进程信息到共享内存
            self::updateStatusToShm();
            
            return $pid;
        }
        // 子进程
        elseif($pid === 0)
        {
            // 忽略信号
            self::ignoreSignal();
            
            // 清空任务
            Lib\Task::delAll();
            
            // 关闭不用的监听socket
            foreach(self::$listenedSockets as $tmp_worker_name => $tmp_socket)
            {
                if($tmp_worker_name != $worker_name)
                {
                    fclose($tmp_socket);
                }
            }
    
            // 尝试以指定用户运行worker
            if($worker_user = Lib\Config::get('workers.' . $worker_name . '.user'))
            {
                self::setWorkerUser($worker_user);
            }
    
            // 关闭输出
            self::resetStdFd();
    
            // 尝试设置子进程进程名称
            self::setWorkerProcessTitle($worker_name);
    
            // 创建worker实例
            include_once WORKERMAN_ROOT_DIR . "Workers/$worker_name.php";
            $worker = new $worker_name($worker_name);
            // 如果该worker有配置监听端口，则将监听端口的socket传递给子进程
            if(isset(self::$listenedSockets[$worker_name]))
            {
                $worker->setListendSocket(self::$listenedSockets[$worker_name]);
            }
            
            // 使worker开始服务
            $worker->start();
            return 0;
        }
        // 出错
        else
        {
            self::notice("create worker fail worker_name:$worker_name detail:pcntl_fork fail");
            return $pid;
        }
    }
    
    
    /**
     * 安装相关信号控制器
     * @return void
     */
    protected static function installSignal()
    {
        // 设置终止信号处理函数
        pcntl_signal(SIGINT,  array('\WORKERMAN\Core\Master', 'signalHandler'), false);
        // 设置SIGUSR1信号处理函数,测试用
        pcntl_signal(SIGUSR1, array('\WORKERMAN\Core\Master', 'signalHandler'), false);
        // 设置SIGUSR2信号处理函数,平滑重启Server
        pcntl_signal(SIGHUP, array('\WORKERMAN\Core\Master', 'signalHandler'), false);
        // 设置子进程退出信号处理函数
        pcntl_signal(SIGCHLD, array('\WORKERMAN\Core\Master', 'signalHandler'), false);
    
        // 设置忽略信号
        pcntl_signal(SIGPIPE, SIG_IGN);
        pcntl_signal(SIGTTIN, SIG_IGN);
        pcntl_signal(SIGTTOU, SIG_IGN);
        pcntl_signal(SIGQUIT, SIG_IGN);
        pcntl_signal(SIGALRM, SIG_IGN);
    }
    
    /**
     * 忽略信号
     * @return void
     */
    protected static function ignoreSignal()
    {
        // 设置忽略信号
        pcntl_signal(SIGPIPE, SIG_IGN);
        pcntl_signal(SIGTTIN, SIG_IGN);
        pcntl_signal(SIGTTOU, SIG_IGN);
        pcntl_signal(SIGQUIT, SIG_IGN);
        pcntl_signal(SIGALRM, SIG_IGN);
        pcntl_signal(SIGINT, SIG_IGN);
        pcntl_signal(SIGUSR1, SIG_IGN);
        pcntl_signal(SIGHUP, SIG_IGN);
        pcntl_signal(SIGCHLD, SIG_IGN);
    }
    
    /**
     * 设置server信号处理函数
     * @param null $null
     * @param int $signal
     * @return void
     */
    public static function signalHandler($signal)
    {
        switch($signal)
        {
            // 停止server信号
            case SIGINT:
                self::notice("Server is shutting down");
                self::stop();
                break;
            // 测试用
            case SIGUSR1:
                break;
            // worker退出信号
            case SIGCHLD:
                // 不要在这里fork，fork出来的子进程无法收到信号
                // self::checkWorkerExit();
                break;
            // 平滑重启server信号
            case SIGHUP:
                Lib\Config::reload();
                self::notice("Server reloading");
                self::addToRestartWorkers(array_keys(self::getPidWorkerNameMap()));
                self::restartWorkers();
                break;
        }
    }
    
    /**
     * 设置子进程进程名称
     * @param string $worker_name
     * @return void
     */
    public static function setWorkerProcessTitle($worker_name)
    {
        if(isset(self::$listenedSockets[$worker_name]))
        {
            // 获得socket的信息
            $sock_name = stream_socket_get_name(self::$listenedSockets[$worker_name], false);
            
            // 更改进程名，如果支持的话
            $mata_data = stream_get_meta_data(self::$listenedSockets[$worker_name]);
            $protocol = substr($mata_data['stream_type'], 0, 3);
            self::setProcessTitle(self::NAME.":worker $worker_name {$protocol}://$sock_name");
        }
        else
        {
            self::setProcessTitle(self::NAME.":worker $worker_name");
        }
            
    }
    
    /**
     * 主进程主循环 主要是监听子进程退出、服务终止、平滑重启信号
     * @return void
     */
    public static function loop()
    {
        $siginfo = array();
        while(1)
        {
            @pcntl_sigtimedwait(array(SIGCHLD), $siginfo, 1);
            // 初始化任务系统
            Lib\Task::tick();
            // 检查是否有进程退出
            self::checkWorkerExit();
            // 触发信号处理
            pcntl_signal_dispatch();
        }
    }
    
    
    /**
     * 监控worker进程状态，退出重启
     * @param resource $channel
     * @param int $flag
     * @param int $pid 退出的进程id
     * @return mixed
     */
    public static function checkWorkerExit()
    {
        // 由于SIGCHLD信号可能重叠导致信号丢失，所以这里要循环获取所有退出的进程id
        while(($pid = pcntl_waitpid(-1, $status, WUNTRACED | WNOHANG)) != 0)
        {
            // 如果是重启的进程，则继续重启进程
            if(isset(self::$workerToRestart[$pid]) && self::$serverStatus != self::STATUS_SHUTDOWN)
            {
                unset(self::$workerToRestart[$pid]);
                self::restartWorkers();
            }
    
            // 出错
            if($pid == -1)
            {
                // 没有子进程了,可能是出现Fatal Err 了
                if(pcntl_get_last_error() == 10)
                {
                    self::notice('Server has no workers now');
                }
                return -1;
            }
    
            // 查找子进程对应的woker_name
            $pid_workname_map = self::getPidWorkerNameMap();
            $worker_name = isset($pid_workname_map[$pid]) ? $pid_workname_map[$pid] : '';
            // 没找到worker_name说明出错了 哪里来的野孩子？
            if(empty($worker_name))
            {
                self::notice("child exist but not found worker_name pid:$pid");
                break;
            }
    
            // 进程退出状态不是0，说明有问题了
            if($status !== 0)
            {
                self::notice("worker exit status $status pid:$pid worker:$worker_name");
            }
            // 记录进程退出状态
            self::$serverStatusInfo['worker_exit_code'][$worker_name][$status] = isset(self::$serverStatusInfo['worker_exit_code'][$worker_name][$status]) ? self::$serverStatusInfo['worker_exit_code'][$worker_name][$status] + 1 : 1;
            // 更新状态到共享内存
            self::updateStatusToShm();
            
            // 清理这个进程的数据
            self::clearWorker($worker_name, $pid);
    
            // 如果服务是不是关闭中
            if(self::$serverStatus != self::STATUS_SHUTDOWN)
            {
                // 重新创建worker
                self::createWorkers();
            }
            // 判断是否都重启完毕
            else
            {
                $all_worker_pid = self::getPidWorkerNameMap();
                if(empty($all_worker_pid))
                {
                    // 删除共享内存
                    self::removeShmAndQueue();
                    // 发送提示
                    self::notice("Server stoped");
                    // 删除pid文件
                    @unlink(WORKERMAN_PID_FILE);
                    exit(0);
                }
            }//end if
        }//end while
    }
    
    /**
     * 获取pid 到 worker_name 的映射
     * @return array ['pid1'=>'worker_name1','pid2'=>'worker_name2', ...]
     */
    public static function getPidWorkerNameMap()
    {
        $all_pid = array();
        foreach(self::$workerPids as $worker_name=>$pid_array)
        {
            foreach($pid_array as $pid)
            {
                $all_pid[$pid] = $worker_name;
            }
        }
        return $all_pid;
    }
    
    /**
     * 放入重启队列中
     * @param array $restart_pids
     * @return void
     */
    public static function addToRestartWorkers($restart_pids)
    {
        if(!is_array($restart_pids))
        {
            self::notice("addToRestartWorkers(".var_export($restart_pids, true).") \$restart_pids not array");
            return false;
        }
    
        // 将pid放入重启队列
        foreach($restart_pids as $pid)
        {
            if(!isset(self::$workerToRestart[$pid]))
            {
                // 重启时间=0
                self::$workerToRestart[$pid] = 0;
            }
        }
    }
    
    /**
     * 重启workers
     * @return void
     */
    public static function restartWorkers()
    {
        // 标记server状态
        if(self::$serverStatus != self::STATUS_RESTARTING_WORKERS && self::$serverStatus != self::STATUS_SHUTDOWN)
        {
            self::$serverStatus = self::STATUS_RESTARTING_WORKERS;
        }
    
        // 没有要重启的进程了
        if(empty(self::$workerToRestart))
        {
            self::$serverStatus = self::STATUS_RUNNING;
            self::notice("\nWorker Restart Success");
            return true;
        }
    
        // 遍历要重启的进程 标记它们重启时间
        foreach(self::$workerToRestart as $pid => $stop_time)
        {
            if($stop_time == 0)
            {
                self::$workerToRestart[$pid] = time();
                posix_kill($pid, SIGHUP);
                Lib\Task::add(self::KILL_WORKER_TIME_LONG, array('\WORKERMAN\Core\Master', 'forceKillWorker'), array($pid), false);
                break;
            }
        }
    }
    
    /**
     * worker进程退出时，master进程的一些清理工作
     * @param string $worker_name
     * @param int $pid
     * @return void
     */
    protected static function clearWorker($worker_name, $pid)
    {
        // 释放一些不用了的数据
        unset(self::$workerToRestart[$pid], self::$workerPids[$worker_name][$pid]);
    }
    
    /**
     * 停止服务
     * @return void
     */
    public static function stop()
    {
        
        // 如果没有子进程则直接退出
        $all_worker_pid = self::getPidWorkerNameMap();
        if(empty($all_worker_pid))
        {
            exit(0);
        }
    
        // 标记server开始关闭
        self::$serverStatus = self::STATUS_SHUTDOWN;
    
        // killWorkerTimeLong 秒后如果还没停止则强制杀死所有进程
        Lib\Task::add(self::KILL_WORKER_TIME_LONG, array('\WORKERMAN\Core\Master', 'stopAllWorker'), array(true), false);
    
        // 停止所有worker
        self::stopAllWorker();
    }
    
    /**
     * 停止所有worker
     * @param bool $force 是否强制退出
     * @return void
     */
    public static function stopAllWorker($force = false)
    {
        // 获得所有pid
        $all_worker_pid = self::getPidWorkerNameMap();
    
        // 强行杀死？
        if($force)
        {
            // 杀死所有子进程
            foreach($all_worker_pid as $pid=>$worker_name)
            {
                // 发送kill信号
                self::forceKillWorker($pid);
                self::notice("Kill workers($worker_name) force!");
            }
        }
        else
        {
            // 向所有子进程发送终止信号
            foreach($all_worker_pid as $pid=>$worker_name)
            {
                // 发送SIGINT信号
                posix_kill($pid, SIGINT);
            }
        }
    }
    
    
    /**
     * 强制杀死进程
     * @param int $pid
     * @return void
     */
    public static function forceKillWorker($pid)
    {
        if(posix_kill($pid, 0))
        {
            self::notice("Kill workers $pid force!");
            posix_kill($pid, SIGKILL);
        }
    }
    
    
    /**
     * 设置运行用户
     * @param string $worker_user
     * @return void
     */
    protected static function setWorkerUser($worker_user)
    {
        $user_info = posix_getpwnam($worker_user);
        // 尝试设置gid uid
        if(!posix_setgid($user_info['gid']) || !posix_setuid($user_info['uid']))
        {
            $notice = 'Notice : Can not run woker as '.$worker_user." , You shuld be root\n";
            self::notice($notice, true);
        }
    }
    
    /**
     * 获取共享内存资源id
     * @return resource
     */
    public static function getShmId()
    {
        return self::$shmId;
    }
    
    /**
     * 获取消息队列资源id
     * @return resource
     */
    public static function getQueueId()
    {
        return self::$queueId;
    }
    
    
    /**
     * 关闭标准输入输出
     * @return void
     */
    protected static function resetStdFd()
    {
        // 开发环境不关闭标准输出，用于调试
        if(Lib\Config::get('debug') == 1 && posix_ttyname(STDOUT))
        {
            return;
        }
        global $STDOUT, $STDERR;
        @fclose(STDOUT);
        @fclose(STDERR);
        // 将标准输出重定向到/dev/null
        $STDOUT = fopen('/dev/null',"rw+");
        $STDERR = fopen('/dev/null',"rw+");
    }
    
    /**
     * 更新主进程收集的状态信息到共享内存
     * @return bool
     */
    protected static function updateStatusToShm()
    {
        if(!self::$shmId)
        {
            return true;
        }
        return shm_put_var(self::$shmId, self::STATUS_VAR_ID, array_merge(self::$serverStatusInfo, array('pid_map'=>self::$workerPids)));
    }
    
    /**
     * 销毁共享内存以及消息队列
     * @return void
     */
    protected static function removeShmAndQueue()
    {
        if(self::$shmId)
        {
            shm_remove(self::$shmId);
        }
        if(self::$queueId)
        {
            msg_remove_queue(self::$queueId);
        }
    }
    
    /**
     * 设置进程名称，需要proctitle支持 或者php>=5.5
     * @param string $title
     * @return void
     */
    protected static function setProcessTitle($title)
    {
        // >=php 5.5
        if (version_compare(phpversion(), "5.5", "ge") && function_exists('cli_set_process_title'))
        {
            cli_set_process_title($title);
        }
        // 需要扩展
        elseif(extension_loaded('proctitle') && function_exists('setproctitle'))
        {
            setproctitle($title);
        }
    }
    
    /**
     * notice,记录到日志
     * @param string $msg
     * @param bool $display
     * @return void
     */
    public static function notice($msg, $display = false)
    {
        Lib\Log::add("Server:".$msg);
        if($display)
        {
            if(self::$serverStatus == self::STATUS_STARTING)
            {
                echo($msg."\n");
            }
        }
    }
}