mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Scribunto
synced 2024-12-13 16:58:26 +00:00
763 lines
20 KiB
PHP
763 lines
20 KiB
PHP
<?php
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use MediaWiki\Logger\LoggerFactory;
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use Psr\Log\LoggerInterface;
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use Psr\Log\NullLogger;
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// @codingStandardsIgnoreLine Squiz.Classes.ValidClassName.NotCamelCaps
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class Scribunto_LuaStandaloneEngine extends Scribunto_LuaEngine {
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protected static $clockTick;
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public $initialStatus;
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public function load() {
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parent::load();
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if ( php_uname( 's' ) === 'Linux' ) {
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$this->initialStatus = $this->interpreter->getStatus();
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} else {
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$this->initialStatus = false;
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}
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}
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public function getPerformanceCharacteristics() {
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return [
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'phpCallsRequireSerialization' => true,
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];
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}
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function reportLimitData( ParserOutput $output ) {
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try {
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$this->load();
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} catch ( Exception $e ) {
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return;
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}
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if ( $this->initialStatus ) {
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$status = $this->interpreter->getStatus();
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$output->setLimitReportData( 'scribunto-limitreport-timeusage',
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[
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sprintf( "%.3f", $status['time'] / $this->getClockTick() ),
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sprintf( "%.3f", $this->options['cpuLimit'] )
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]
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);
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$output->setLimitReportData( 'scribunto-limitreport-virtmemusage',
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[
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$status['vsize'],
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$this->options['memoryLimit']
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]
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);
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$output->setLimitReportData( 'scribunto-limitreport-estmemusage',
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$status['vsize'] - $this->initialStatus['vsize']
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);
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}
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$logs = $this->getLogBuffer();
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if ( $logs !== '' ) {
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$output->addModules( 'ext.scribunto.logs' );
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$output->setLimitReportData( 'scribunto-limitreport-logs', $logs );
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}
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}
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function formatLimitData( $key, &$value, &$report, $isHTML, $localize ) {
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global $wgLang;
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$lang = $localize ? $wgLang : Language::factory( 'en' );
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switch ( $key ) {
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case 'scribunto-limitreport-logs':
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if ( $isHTML ) {
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$report .= $this->formatHtmlLogs( $value, $localize );
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}
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return false;
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case 'scribunto-limitreport-virtmemusage':
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$value = array_map( [ $lang, 'formatSize' ], $value );
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break;
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case 'scribunto-limitreport-estmemusage':
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$value = $lang->formatSize( $value );
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break;
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}
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return true;
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}
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/**
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* @return mixed
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*/
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function getClockTick() {
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if ( self::$clockTick === null ) {
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Wikimedia\suppressWarnings();
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self::$clockTick = intval( shell_exec( 'getconf CLK_TCK' ) );
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Wikimedia\restoreWarnings();
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if ( !self::$clockTick ) {
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self::$clockTick = 100;
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}
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}
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return self::$clockTick;
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}
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/**
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* @return Scribunto_LuaStandaloneInterpreter
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*/
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function newInterpreter() {
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return new Scribunto_LuaStandaloneInterpreter( $this, $this->options + [
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'logger' => LoggerFactory::getInstance( 'Scribunto' )
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] );
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}
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public function getSoftwareInfo( array &$software ) {
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$ver = Scribunto_LuaStandaloneInterpreter::getLuaVersion( $this->options );
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if ( $ver !== null ) {
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if ( substr( $ver, 0, 6 ) === 'LuaJIT' ) {
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$software['[http://luajit.org/ LuaJIT]'] = str_replace( 'LuaJIT ', '', $ver );
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} else {
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$software['[http://www.lua.org/ Lua]'] = str_replace( 'Lua ', '', $ver );
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}
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}
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}
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}
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// @codingStandardsIgnoreLine Squiz.Classes.ValidClassName.NotCamelCaps
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class Scribunto_LuaStandaloneInterpreter extends Scribunto_LuaInterpreter {
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protected static $nextInterpreterId = 0;
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/**
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* @var Scribunto_LuaStandaloneEngine
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*/
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public $engine;
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/**
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* @var bool
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*/
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public $enableDebug;
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/**
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* @var resource
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*/
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public $proc;
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/**
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* @var resource
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*/
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public $writePipe;
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/**
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* @var resource
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*/
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public $readPipe;
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/**
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* @var ScribuntoException
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*/
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public $exitError;
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/**
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* @var int
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*/
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public $id;
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/**
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* @var LoggerInterface
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*/
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protected $logger;
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/**
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* @param Scribunto_LuaStandaloneEngine $engine
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* @param array $options
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* @throws MWException
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* @throws Scribunto_LuaInterpreterNotFoundError
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* @throws ScribuntoException
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*/
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function __construct( $engine, array $options ) {
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$this->id = self::$nextInterpreterId++;
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if ( $options['errorFile'] === null ) {
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$options['errorFile'] = wfGetNull();
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}
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if ( $options['luaPath'] === null ) {
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$path = false;
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// Note, if you alter these, also alter getLuaVersion() below
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if ( PHP_OS == 'Linux' ) {
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if ( PHP_INT_SIZE == 4 ) {
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$path = 'lua5_1_5_linux_32_generic/lua';
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} elseif ( PHP_INT_SIZE == 8 ) {
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$path = 'lua5_1_5_linux_64_generic/lua';
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}
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} elseif ( PHP_OS == 'Windows' || PHP_OS == 'WINNT' || PHP_OS == 'Win32' ) {
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if ( PHP_INT_SIZE == 4 ) {
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$path = 'lua5_1_5_Win32_bin/lua5.1.exe';
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} elseif ( PHP_INT_SIZE == 8 ) {
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$path = 'lua5_1_5_Win64_bin/lua5.1.exe';
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}
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} elseif ( PHP_OS == 'Darwin' ) {
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$path = 'lua5_1_5_mac_lion_fat_generic/lua';
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}
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if ( $path === false ) {
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throw new Scribunto_LuaInterpreterNotFoundError(
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'No Lua interpreter was given in the configuration, ' .
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'and no bundled binary exists for this platform.' );
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}
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$options['luaPath'] = __DIR__ . "/binaries/$path";
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if ( !is_executable( $options['luaPath'] ) ) {
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throw new MWException(
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sprintf( 'The lua binary (%s) is not executable.', $options['luaPath'] )
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);
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}
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}
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$this->engine = $engine;
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$this->enableDebug = !empty( $options['debug'] );
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$this->logger = isset( $options['logger'] )
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? $options['logger']
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: new NullLogger();
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$pipes = null;
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$cmd = wfEscapeShellArg(
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$options['luaPath'],
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__DIR__ . '/mw_main.lua',
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dirname( dirname( __DIR__ ) ),
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$this->id,
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PHP_INT_SIZE
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);
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if ( php_uname( 's' ) == 'Linux' ) {
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// Limit memory and CPU
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$cmd = wfEscapeShellArg(
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'exec', # proc_open() passes $cmd to 'sh -c' on Linux, so add an 'exec' to bypass it
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'/bin/sh',
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__DIR__ . '/lua_ulimit.sh',
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$options['cpuLimit'], # soft limit (SIGXCPU)
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$options['cpuLimit'] + 1, # hard limit
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intval( $options['memoryLimit'] / 1024 ),
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$cmd );
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}
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if ( php_uname( 's' ) == 'Windows NT' ) {
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// Like the passthru() in older versions of PHP,
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// PHP's invokation of cmd.exe in proc_open() is broken:
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// http://news.php.net/php.internals/21796
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// Unlike passthru(), it is not fixed in any PHP version,
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// so we use the fix similar to one in wfShellExec()
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$cmd = '"' . $cmd . '"';
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}
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$this->logger->debug( __METHOD__.": creating interpreter: $cmd\n" );
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// Check whether proc_open is available before trying to call it (e.g.
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// PHP's disable_functions may have removed it)
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if ( !function_exists( 'proc_open' ) ) {
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throw $this->engine->newException( 'scribunto-luastandalone-proc-error-proc-open' );
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}
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// Clear the "last error", so if proc_open fails we can know any
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// warning was generated by that.
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// @codingStandardsIgnoreLine Generic.PHP.NoSilencedErrors.Discouraged
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@trigger_error( '' );
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$this->proc = proc_open(
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$cmd,
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[
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[ 'pipe', 'r' ],
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[ 'pipe', 'w' ],
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[ 'file', $options['errorFile'], 'a' ]
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],
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$pipes );
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if ( !$this->proc ) {
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$err = error_get_last();
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if ( !empty( $err['message'] ) ) {
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throw $this->engine->newException( 'scribunto-luastandalone-proc-error-msg',
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[ 'args' => [ $err['message'] ] ] );
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} else {
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throw $this->engine->newException( 'scribunto-luastandalone-proc-error' );
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}
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}
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$this->writePipe = $pipes[0];
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$this->readPipe = $pipes[1];
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}
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function __destruct() {
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$this->terminate();
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}
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public static function getLuaVersion( array $options ) {
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if ( $options['luaPath'] === null ) {
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// We know which versions are distributed, no need to run them.
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if ( PHP_OS == 'Linux' ) {
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return 'Lua 5.1.5';
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} elseif ( PHP_OS == 'Windows' || PHP_OS == 'WINNT' || PHP_OS == 'Win32' ) {
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return 'Lua 5.1.4';
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} elseif ( PHP_OS == 'Darwin' ) {
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return 'Lua 5.1.5';
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} else {
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return null;
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}
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}
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// Ask the interpreter what version it is, using the "-v" option.
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// The output is expected to be one line, something like these:
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// Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio
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// LuaJIT 2.0.0 -- Copyright (C) 2005-2012 Mike Pall. http://luajit.org/
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$cmd = wfEscapeShellArg( $options['luaPath'] ) . ' -v';
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$handle = popen( $cmd, 'r' );
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if ( $handle ) {
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$ret = fgets( $handle, 80 );
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pclose( $handle );
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if ( $ret && preg_match( '/^Lua(?:JIT)? \S+/', $ret, $m ) ) {
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return $m[0];
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}
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}
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return null;
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}
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public function terminate() {
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if ( $this->proc ) {
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$this->logger->debug( __METHOD__.": terminating\n" );
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proc_terminate( $this->proc );
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proc_close( $this->proc );
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$this->proc = false;
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}
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}
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public function quit() {
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if ( !$this->proc ) {
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return;
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}
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$this->dispatch( [ 'op' => 'quit' ] );
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proc_close( $this->proc );
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}
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public function testquit() {
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if ( !$this->proc ) {
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return;
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}
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$this->dispatch( [ 'op' => 'testquit' ] );
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proc_close( $this->proc );
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}
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/**
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* @param string $text
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* @param string $chunkName
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* @return Scribunto_LuaStandaloneInterpreterFunction
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*/
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public function loadString( $text, $chunkName ) {
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$this->cleanupLuaChunks();
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$result = $this->dispatch( [
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'op' => 'loadString',
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'text' => $text,
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'chunkName' => $chunkName
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] );
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return new Scribunto_LuaStandaloneInterpreterFunction( $this->id, $result[1] );
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}
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public function callFunction( $func /* ... */ ) {
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if ( !( $func instanceof Scribunto_LuaStandaloneInterpreterFunction ) ) {
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throw new MWException( __METHOD__.': invalid function type' );
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}
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if ( $func->interpreterId !== $this->id ) {
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throw new MWException( __METHOD__.': function belongs to a different interpreter' );
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}
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$args = func_get_args();
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unset( $args[0] );
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// $args is now conveniently a 1-based array, as required by the Lua server
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$this->cleanupLuaChunks();
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$result = $this->dispatch( [
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'op' => 'call',
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'id' => $func->id,
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'nargs' => count( $args ),
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'args' => $args,
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] );
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// Convert return values to zero-based
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return array_values( $result );
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}
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public function wrapPhpFunction( $callable ) {
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static $uid = 0;
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$id = "anonymous*" . ++$uid;
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$this->callbacks[$id] = $callable;
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$ret = $this->dispatch( [
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'op' => 'wrapPhpFunction',
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'id' => $id,
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] );
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return $ret[1];
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}
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public function cleanupLuaChunks() {
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if ( isset( Scribunto_LuaStandaloneInterpreterFunction::$anyChunksDestroyed[$this->id] ) ) {
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unset( Scribunto_LuaStandaloneInterpreterFunction::$anyChunksDestroyed[$this->id] );
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$this->dispatch( [
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'op' => 'cleanupChunks',
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'ids' => Scribunto_LuaStandaloneInterpreterFunction::$activeChunkIds[$this->id]
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] );
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}
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}
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public function isLuaFunction( $object ) {
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return $object instanceof Scribunto_LuaStandaloneInterpreterFunction;
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}
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public function registerLibrary( $name, array $functions ) {
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$functionIds = [];
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foreach ( $functions as $funcName => $callback ) {
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$id = "$name-$funcName";
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$this->callbacks[$id] = $callback;
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$functionIds[$funcName] = $id;
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}
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$this->dispatch( [
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'op' => 'registerLibrary',
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'name' => $name,
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'functions' => $functionIds,
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] );
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}
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public function getStatus() {
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$result = $this->dispatch( [
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'op' => 'getStatus',
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] );
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return $result[1];
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}
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public function pauseUsageTimer() {
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}
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public function unpauseUsageTimer() {
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}
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/**
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* Fill in missing nulls in a list received from Lua
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*
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* @param array $array List received from Lua
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* @param int $count Number of values that should be in the list
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* @return array Non-sparse array
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*/
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private static function fixNulls( array $array, $count ) {
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if ( count( $array ) === $count ) {
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return $array;
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} else {
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return array_replace( array_fill( 1, $count, null ), $array );
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}
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}
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protected function handleCall( $message ) {
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$message['args'] = self::fixNulls( $message['args'], $message['nargs'] );
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try {
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$result = $this->callback( $message['id'], $message['args'] );
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} catch ( Scribunto_LuaError $e ) {
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return [
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'op' => 'error',
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'value' => $e->getLuaMessage(),
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];
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}
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// Convert to a 1-based array
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if ( $result !== null && count( $result ) ) {
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$result = array_combine( range( 1, count( $result ) ), $result );
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} else {
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$result = [];
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}
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return [
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'op' => 'return',
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'nvalues' => count( $result ),
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'values' => $result
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];
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}
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protected function callback( $id, array $args ) {
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return call_user_func_array( $this->callbacks[$id], $args );
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}
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protected function handleError( $message ) {
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$opts = [];
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if ( preg_match( '/^(.*?):(\d+): (.*)$/', $message['value'], $m ) ) {
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$opts['module'] = $m[1];
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$opts['line'] = $m[2];
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$message['value'] = $m[3];
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}
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if ( isset( $message['trace'] ) ) {
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$opts['trace'] = array_values( $message['trace'] );
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}
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throw $this->engine->newLuaError( $message['value'], $opts );
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}
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protected function dispatch( $msgToLua ) {
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$this->sendMessage( $msgToLua );
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while ( true ) {
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$msgFromLua = $this->receiveMessage();
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switch ( $msgFromLua['op'] ) {
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case 'return':
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return self::fixNulls( $msgFromLua['values'], $msgFromLua['nvalues'] );
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case 'call':
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$msgToLua = $this->handleCall( $msgFromLua );
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$this->sendMessage( $msgToLua );
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break;
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case 'error':
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$this->handleError( $msgFromLua );
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return; // not reached
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default:
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$this->logger->error( __METHOD__ .": invalid response op \"{$msgFromLua['op']}\"\n" );
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throw $this->engine->newException( 'scribunto-luastandalone-decode-error' );
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}
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}
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}
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protected function sendMessage( $msg ) {
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$this->debug( "TX ==> {$msg['op']}" );
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$this->checkValid();
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// Send the message
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$encMsg = $this->encodeMessage( $msg );
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if ( !fwrite( $this->writePipe, $encMsg ) ) {
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// Write error, probably the process has terminated
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// If it has, handleIOError() will throw. If not, throw an exception ourselves.
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$this->handleIOError();
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throw $this->engine->newException( 'scribunto-luastandalone-write-error' );
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}
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}
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protected function receiveMessage() {
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$this->checkValid();
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// Read the header
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$header = fread( $this->readPipe, 16 );
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if ( strlen( $header ) !== 16 ) {
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$this->handleIOError();
|
|
throw $this->engine->newException( 'scribunto-luastandalone-read-error' );
|
|
}
|
|
$length = $this->decodeHeader( $header );
|
|
|
|
// Read the reply body
|
|
$body = '';
|
|
$lengthRemaining = $length;
|
|
while ( $lengthRemaining ) {
|
|
$buffer = fread( $this->readPipe, $lengthRemaining );
|
|
if ( $buffer === false || feof( $this->readPipe ) ) {
|
|
$this->handleIOError();
|
|
throw $this->engine->newException( 'scribunto-luastandalone-read-error' );
|
|
}
|
|
$body .= $buffer;
|
|
$lengthRemaining -= strlen( $buffer );
|
|
}
|
|
$body = strtr( $body, [
|
|
'\\r' => "\r",
|
|
'\\n' => "\n",
|
|
'\\\\' => '\\',
|
|
] );
|
|
$msg = unserialize( $body );
|
|
$this->debug( "RX <== {$msg['op']}" );
|
|
return $msg;
|
|
}
|
|
|
|
protected function encodeMessage( $message ) {
|
|
$serialized = $this->encodeLuaVar( $message );
|
|
$length = strlen( $serialized );
|
|
$check = $length * 2 - 1;
|
|
|
|
return sprintf( '%08x%08x%s', $length, $check, $serialized );
|
|
}
|
|
|
|
protected function encodeLuaVar( $var, $level = 0 ) {
|
|
if ( $level > 100 ) {
|
|
throw new MWException( __METHOD__.': recursion depth limit exceeded' );
|
|
}
|
|
$type = gettype( $var );
|
|
switch ( $type ) {
|
|
case 'boolean':
|
|
return $var ? 'true' : 'false';
|
|
case 'integer':
|
|
return $var;
|
|
case 'double':
|
|
if ( !is_finite( $var ) ) {
|
|
if ( is_nan( $var ) ) {
|
|
return '(0/0)';
|
|
}
|
|
if ( $var === INF ) {
|
|
return '(1/0)';
|
|
}
|
|
if ( $var === -INF ) {
|
|
return '(-1/0)';
|
|
}
|
|
throw new MWException( __METHOD__.': cannot convert non-finite number' );
|
|
}
|
|
return sprintf( '%.17g', $var );
|
|
case 'string':
|
|
return '"' .
|
|
strtr( $var, [
|
|
'"' => '\\"',
|
|
'\\' => '\\\\',
|
|
"\n" => '\\n',
|
|
"\r" => '\\r',
|
|
"\000" => '\\000',
|
|
] ) .
|
|
'"';
|
|
case 'array':
|
|
$s = '{';
|
|
foreach ( $var as $key => $element ) {
|
|
if ( $s !== '{' ) {
|
|
$s .= ',';
|
|
}
|
|
|
|
// Lua's number type can't represent most integers beyond 2**53, so stringify such keys
|
|
if ( is_int( $key ) && ( $key > 9007199254740992 || $key < -9007199254740992 ) ) {
|
|
$key = sprintf( '%d', $key );
|
|
}
|
|
|
|
$s .= '[' . $this->encodeLuaVar( $key, $level + 1 ) . ']' .
|
|
'=' . $this->encodeLuaVar( $element, $level + 1 );
|
|
}
|
|
$s .= '}';
|
|
return $s;
|
|
case 'object':
|
|
if ( !( $var instanceof Scribunto_LuaStandaloneInterpreterFunction ) ) {
|
|
throw new MWException( __METHOD__.': unable to convert object of type ' .
|
|
get_class( $var ) );
|
|
} elseif ( $var->interpreterId !== $this->id ) {
|
|
throw new MWException(
|
|
__METHOD__.': unable to convert function belonging to a different interpreter'
|
|
);
|
|
} else {
|
|
return 'chunks[' . intval( $var->id ) . ']';
|
|
}
|
|
case 'resource':
|
|
throw new MWException( __METHOD__.': unable to convert resource' );
|
|
case 'NULL':
|
|
return 'nil';
|
|
default:
|
|
throw new MWException( __METHOD__.': unable to convert variable of unknown type' );
|
|
}
|
|
}
|
|
|
|
protected function decodeHeader( $header ) {
|
|
$length = substr( $header, 0, 8 );
|
|
$check = substr( $header, 8, 8 );
|
|
if ( !preg_match( '/^[0-9a-f]+$/', $length ) || !preg_match( '/^[0-9a-f]+$/', $check ) ) {
|
|
throw $this->engine->newException( 'scribunto-luastandalone-decode-error' );
|
|
}
|
|
$length = hexdec( $length );
|
|
$check = hexdec( $check );
|
|
if ( $length * 2 - 1 !== $check ) {
|
|
throw $this->engine->newException( 'scribunto-luastandalone-decode-error' );
|
|
}
|
|
return $length;
|
|
}
|
|
|
|
/**
|
|
* @throws ScribuntoException
|
|
*/
|
|
protected function checkValid() {
|
|
if ( !$this->proc ) {
|
|
$this->logger->error( __METHOD__ . ": process already terminated\n" );
|
|
if ( $this->exitError ) {
|
|
throw $this->exitError;
|
|
} else {
|
|
throw $this->engine->newException( 'scribunto-luastandalone-gone' );
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @throws ScribuntoException
|
|
*/
|
|
protected function handleIOError() {
|
|
$this->checkValid();
|
|
|
|
// Terminate, fetch the status, then close. proc_close()'s return
|
|
// value isn't helpful here because there's no way to differentiate a
|
|
// signal-kill from a normal exit.
|
|
proc_terminate( $this->proc );
|
|
while ( true ) {
|
|
$status = proc_get_status( $this->proc );
|
|
if ( $status === false ) {
|
|
// WTF? Let the caller throw an appropriate error.
|
|
return;
|
|
}
|
|
if ( !$status['running'] ) {
|
|
break;
|
|
}
|
|
usleep( 10000 ); // Give the killed process a chance to be scheduled
|
|
}
|
|
proc_close( $this->proc );
|
|
$this->proc = false;
|
|
|
|
// proc_open() sometimes uses a shell, check for shell-style signal reporting.
|
|
if ( !$status['signaled'] && ( $status['exitcode'] & 0x80 ) === 0x80 ) {
|
|
$status['signaled'] = true;
|
|
$status['termsig'] = $status['exitcode'] - 128;
|
|
}
|
|
|
|
if ( $status['signaled'] ) {
|
|
if ( defined( 'SIGXCPU' ) && $status['termsig'] === SIGXCPU ) {
|
|
$this->exitError = $this->engine->newException( 'scribunto-common-timeout' );
|
|
} else {
|
|
$this->exitError = $this->engine->newException( 'scribunto-luastandalone-signal',
|
|
[ 'args' => [ $status['termsig'] ] ] );
|
|
}
|
|
} else {
|
|
$this->exitError = $this->engine->newException( 'scribunto-luastandalone-exited',
|
|
[ 'args' => [ $status['exitcode'] ] ] );
|
|
}
|
|
throw $this->exitError;
|
|
}
|
|
|
|
protected function debug( $msg ) {
|
|
if ( $this->enableDebug ) {
|
|
$this->logger->debug( "Lua: $msg\n" );
|
|
}
|
|
}
|
|
}
|
|
|
|
// @codingStandardsIgnoreLine Squiz.Classes.ValidClassName.NotCamelCaps
|
|
class Scribunto_LuaStandaloneInterpreterFunction {
|
|
public static $anyChunksDestroyed = [];
|
|
public static $activeChunkIds = [];
|
|
|
|
/**
|
|
* @var int
|
|
*/
|
|
public $interpreterId;
|
|
|
|
/**
|
|
* @var int
|
|
*/
|
|
public $id;
|
|
|
|
/**
|
|
* @param int $interpreterId
|
|
* @param int $id
|
|
*/
|
|
function __construct( $interpreterId, $id ) {
|
|
$this->interpreterId = $interpreterId;
|
|
$this->id = $id;
|
|
$this->incrementRefCount();
|
|
}
|
|
|
|
function __clone() {
|
|
$this->incrementRefCount();
|
|
}
|
|
|
|
function __wakeup() {
|
|
$this->incrementRefCount();
|
|
}
|
|
|
|
function __destruct() {
|
|
$this->decrementRefCount();
|
|
}
|
|
|
|
private function incrementRefCount() {
|
|
if ( !isset( self::$activeChunkIds[$this->interpreterId] ) ) {
|
|
self::$activeChunkIds[$this->interpreterId] = [ $this->id => 1 ];
|
|
} elseif ( !isset( self::$activeChunkIds[$this->interpreterId][$this->id] ) ) {
|
|
self::$activeChunkIds[$this->interpreterId][$this->id] = 1;
|
|
} else {
|
|
self::$activeChunkIds[$this->interpreterId][$this->id]++;
|
|
}
|
|
}
|
|
|
|
private function decrementRefCount() {
|
|
if ( isset( self::$activeChunkIds[$this->interpreterId][$this->id] ) ) {
|
|
if ( --self::$activeChunkIds[$this->interpreterId][$this->id] <= 0 ) {
|
|
unset( self::$activeChunkIds[$this->interpreterId][$this->id] );
|
|
self::$anyChunksDestroyed[$this->interpreterId] = true;
|
|
}
|
|
} else {
|
|
self::$anyChunksDestroyed[$this->interpreterId] = true;
|
|
}
|
|
}
|
|
}
|