greyhound.php
author Dan
Wed, 24 Sep 2008 13:47:42 -0400
changeset 54 6d8b9497e44b
parent 48 d643bfb862d8
child 55 b8a3c9c54fbe
permissions -rwxr-xr-x
Added check for PHP 5.1.0 and improved error handling for missing pcntl
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#!/usr/bin/env php
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<?php
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/**
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 * Greyhound - real web management for Amarok
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 * Copyright (C) 2008 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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define('GREY_VERSION', '0.1a4');
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// Try to trap termination signals to cleanly close the socket when needed
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// AmaroK sends a SIGTERM when it is shut down or the user requests to stop
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// the script
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if ( function_exists('pcntl_signal') )
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{
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  // required for signal handling to work
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  declare(ticks=1);
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  // trap SIGTERM
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  pcntl_signal(SIGTERM, 'sigterm');
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  pcntl_signal(SIGINT,  'sigterm');
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  pcntl_signal(SIGUSR1, 'handle_refresh_signal');
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}
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@ini_set('display_errors', 'on');
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// get the root
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define('GREY_ROOT', dirname(__FILE__));
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// what kind of terminal do we have?
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$use_colors = ( @in_array(@$_SERVER['TERM'], array('linux', 'xterm', 'vt100')) ) ? true : false;
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require(GREY_ROOT . '/functions.php');
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// start up...
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status('Starting Greyhound Web Control v' . GREY_VERSION);
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status('loading files');
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require_once(GREY_ROOT . '/webserver.php');
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define('SMARTY_DIR', GREY_ROOT . '/smarty/');
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require_once(GREY_ROOT . '/smarty/Smarty.class.php');
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require_once(GREY_ROOT . '/playlist.php');
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require_once(GREY_ROOT . '/json.php');
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require_once(GREY_ROOT . '/ajax.php');
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require_once(GREY_ROOT . '/uiconfig.php');
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require_once(GREY_ROOT . '/imagetools.php');
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require_once(GREY_ROOT . '/sessions.php');
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//
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// LOAD OUR CONFIG
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// Amarok launches Greyhound with a different wd than Greyhound's root. This means
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// that we can drop our own config (set up from the web UI) in there and load that
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// instead of the default config, which comes with greyhound.
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//
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grey_reload_config();
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// create directories
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@mkdir('./compiled');
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// signal handler
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function sigterm($signal)
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{
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  global $httpd, $avahi_process;
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  if ( !defined('HTTPD_WS_CHILD') )
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  {
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    status("Caught SIGTERM, cleaning up.");
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    if ( is_resource($avahi_process) )
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    {
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      @proc_terminate($avahi_process);
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    }
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  }
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  exit(0);
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}
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status('doing PHP capabilities check');
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if ( version_compare(PHP_VERSION, '5.1.0', '<') )
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{
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  burnout('The minimum required version of PHP for Greyhound is 5.1.0. PHP 5.2.x is recommended.');
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}
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if ( !function_exists('pcntl_signal') )
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{
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  warning('System does not support POSIX functions. Termination signals will result in unclean shutdown and multi-process webserving will not work.');
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  $allow_fork = false;
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}
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if ( !function_exists('simplexml_load_file') )
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{
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  warning('Can\'t find support for SimpleXML, which is needed to parse the Amarok playlist file.');
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  burnout('SimpleXML required to continue. You may have an outdated version of PHP; most versions of PHP 5 have SimpleXML built-in. Check your distribution\'s documentation to find out how to enable PHP\'s SimpleXML support.');
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}
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if ( !function_exists('imagepng') || !function_exists('imagecopyresampled') || !function_exists('imagecreatefromjpeg') || !function_exists('imagecreatefromwbmp') )
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{
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  warning('Can\'t find support for GD 2.0. Artwork will not be displayed. Look around in your distro\'s package manager for php-gd or php5-gd.');
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}
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status('initializing playlist');
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// init playlist object
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$playlist = array();
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$amarok_home = false;
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rebuild_playlist();
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// startup webserver
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$ip = ( $public ) ? '0.0.0.0' : '127.0.0.1';
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$port = 7447;
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try
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{
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  status('starting PhpHttpd');
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  $httpd = new WebServer($ip, $port);
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  // if we have avahi and proc_open support, publish the service (new)
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  if ( $allowcontrol && function_exists('proc_open') && $path = which('avahi-publish') )
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  {
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    // get our current hostname (hack, sort of)
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    $hostfile = tempnam('hostname', ( function_exists('sys_get_temp_dir') ? sys_get_temp_dir() : '/tmp' ));
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    system("hostname > '$hostfile' 2>/dev/null");
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    $hostname = trim(@file_get_contents($hostfile));
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    unlink($hostfile);
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    if ( !empty($hostname) )
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    {
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      status('Publishing service on local network with Avahi');
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      $descriptorspec = array(
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          0 => array('pipe', 'r'),
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          1 => array('pipe', 'w'),
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          2 => array('pipe', 'w')
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        );
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      $thisuser = get_current_user();
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      $avahi_command = "'$path' -s \"{$thisuser}'s\"' AmaroK playlist on $hostname' _greyhound._tcp $port";
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      $avahi_process = proc_open($avahi_command, $descriptorspec, $avahi_pipes);
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      if ( !$avahi_process )
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      {
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        warning('proc_open() failed; could not start announcement of service on Avahi network');
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      }
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    }
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  }
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  // setup handlers
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  status('initializing handlers');
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  $httpd->add_handler('index',                'function', 'amarok_playlist');
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  $httpd->add_handler('login',                'function', 'greyhound_login_page');
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  $httpd->add_handler('logout',               'function', 'greyhound_logout');
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  $httpd->add_handler('config',               'function', 'greyhound_config');
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  $httpd->add_handler('action.json',          'function', 'ajax_request_handler');
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  $httpd->add_handler('artwork',              'function', 'artwork_request_handler');
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  $httpd->add_handler('scripts',              'dir',      GREY_ROOT . '/scripts');
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  $httpd->add_handler('favicon.ico',          'file',     GREY_ROOT . '/amarok_icon.ico');
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  $httpd->add_handler('apple-touch-icon.png', 'file',     GREY_ROOT . '/apple-touch-icon.png');
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  $httpd->add_handler('spacer.gif',           'file',     GREY_ROOT . '/spacer.gif');
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  $httpd->threader->ipc_register('reloadconfig', 'grey_reload_config');
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  // load all themes if forking is enabled
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  // Themes are loaded when the playlist is requested. This is fine for
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  // single-threaded operation, but if the playlist handler is only loaded
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  // in a child process, we need to preload all themes into the parent before
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  // children can respond to theme resource requests.
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  // if ( $allow_fork )
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  // {
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    status('Preloading themes');
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    $dh = @opendir(GREY_ROOT . '/themes');
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    if ( !$dh )
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      burnout('Could not open themes directory');
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    while ( $dir = @readdir($dh) )
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    {
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      if ( $dir == '.' || $dir == '..' )
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        continue;
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      if ( is_dir( GREY_ROOT . "/themes/$dir" ) )
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        load_theme($dir);
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    }
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  // }
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  $httpd->allow_dir_list = true;
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  $httpd->allow_fork = ( $allow_fork ) ? true : false;
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  $httpd->default_document = 'index';
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  status("Entering main server loop - ^C to interrupt, listening on port $port");
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  $httpd->serve();
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}
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catch( Exception $e )
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{
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  if ( strstr(strval($e), "Could not bind") || strstr(strval($e), "Address already in use") )
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  {
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    burnout("Could not bind to the port $ip:$port. Is Greyhound already running? Sometimes browsers don't close off their connections until Greyhound has been dead for about a minute, so try starting Greyhound again in roughly 60 seconds. If that doesn't work, type \"killall -9 php\" at a terminal and try starting Greyhound again in 60 seconds.");
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  }
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  burnout("Exception caught while running webserver:\n$e");
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}
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function handle_refresh_signal()
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{
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  global $httpd;
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  if ( !is_object($httpd) )
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    // we're not serving yet.
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    return false;
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  // we've got an httpd instance; rebuild the playlist
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  rebuild_playlist();
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}
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