ConsoleReaderChildProcess.php

<?php
 
/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
 */
 
declare(strict_types=1);
 
namespace pocketmine\console;
 
use pmmp\thread\Thread as NativeThread;
use pmmp\thread\ThreadSafeArray;
use pocketmine\utils\Process;
use function cli_set_process_title;
use function count;
use function dirname;
use function feof;
use function fwrite;
use function stream_socket_client;
 
require dirname(__DIR__, 2) . '/vendor/autoload.php';
 
if(count($argv) !== 2){
    die("Please provide a server to connect to");
}
 
@cli_set_process_title('PocketMine-MP Console Reader');
$errCode = null;
$errMessage = null;
$socket = stream_socket_client($argv[1], $errCode, $errMessage, 15.0);
if($socket === false){
    throw new \RuntimeException("Failed to connect to server process ($errCode): $errMessage");
}
 
$channel = new ThreadSafeArray();
$thread = new class($channel) extends NativeThread{
    public function __construct(
        private ThreadSafeArray $channel,
    ){}
 
    public function run() : void{
        require dirname(__DIR__, 2) . '/vendor/autoload.php';
 
        $channel = $this->channel;
        $reader = new ConsoleReader();
        while(true){ // @phpstan-ignore-line
            $line = $reader->readLine();
            if($line !== null){
                $channel->synchronized(function() use ($channel, $line) : void{
                    $channel[] = $line;
                    $channel->notify();
                });
            }
        }
    }
};
 
$thread->start(NativeThread::INHERIT_NONE);
while(!feof($socket)){
    $line = $channel->synchronized(function() use ($channel) : ?string{
        if(count($channel) === 0){
            $channel->wait(1_000_000);
        }
        $line = $channel->shift();
        return $line;
    });
    if(@fwrite($socket, ($line ?? "") . "\n") === false){
        //Always send even if there's no line, to check if the parent is alive
        //If the parent process was terminated forcibly, it won't close the connection properly, so feof() will return
        //false even though the connection is actually broken. However, fwrite() will fail.
        break;
    }
}
 
//For simplicity's sake, we don't bother with a graceful shutdown here.
//The parent process would normally forcibly terminate the child process anyway, so we only reach this point if the
//parent process was terminated forcibly and didn't clean up after itself.
Process::kill(Process::pid());