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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\Scribunto\Engines\LuaStandalone; |
| 4 | |
| 5 | use InvalidArgumentException; |
| 6 | use MediaWiki\Extension\Scribunto\Engines\LuaCommon\LuaError; |
| 7 | use MediaWiki\Extension\Scribunto\Engines\LuaCommon\LuaInterpreter; |
| 8 | use MediaWiki\Extension\Scribunto\Engines\LuaCommon\LuaInterpreterNotExecutableError; |
| 9 | use MediaWiki\Extension\Scribunto\Engines\LuaCommon\LuaInterpreterNotFoundError; |
| 10 | use MediaWiki\Extension\Scribunto\ScribuntoException; |
| 11 | use Psr\Log\LoggerInterface; |
| 12 | use Psr\Log\NullLogger; |
| 13 | use RuntimeException; |
| 14 | use UtfNormal\Validator; |
| 15 | |
| 16 | class LuaStandaloneInterpreter extends LuaInterpreter { |
| 17 | /** @var int */ |
| 18 | protected static $nextInterpreterId = 0; |
| 19 | |
| 20 | /** |
| 21 | * @var LuaStandaloneEngine |
| 22 | */ |
| 23 | public $engine; |
| 24 | |
| 25 | /** |
| 26 | * @var bool |
| 27 | */ |
| 28 | public $enableDebug; |
| 29 | |
| 30 | /** |
| 31 | * @var resource|bool |
| 32 | */ |
| 33 | public $proc; |
| 34 | |
| 35 | /** |
| 36 | * @var resource |
| 37 | */ |
| 38 | public $writePipe; |
| 39 | |
| 40 | /** |
| 41 | * @var resource |
| 42 | */ |
| 43 | public $readPipe; |
| 44 | |
| 45 | /** |
| 46 | * @var ScribuntoException |
| 47 | */ |
| 48 | public $exitError; |
| 49 | |
| 50 | /** |
| 51 | * @var int |
| 52 | */ |
| 53 | public $id; |
| 54 | |
| 55 | /** |
| 56 | * @var LoggerInterface |
| 57 | */ |
| 58 | protected $logger; |
| 59 | |
| 60 | /** |
| 61 | * @var callable[] |
| 62 | */ |
| 63 | protected $callbacks; |
| 64 | |
| 65 | /** |
| 66 | * @param LuaStandaloneEngine $engine |
| 67 | * @param array $options |
| 68 | * @throws LuaInterpreterNotFoundError |
| 69 | * @throws ScribuntoException |
| 70 | */ |
| 71 | public function __construct( $engine, array $options ) { |
| 72 | $this->id = self::$nextInterpreterId++; |
| 73 | |
| 74 | if ( $options['errorFile'] === null ) { |
| 75 | $options['errorFile'] = wfGetNull(); |
| 76 | } |
| 77 | |
| 78 | if ( $options['luaPath'] === null ) { |
| 79 | $path = false; |
| 80 | |
| 81 | // Note, if you alter these, also alter getLuaVersion() below |
| 82 | if ( PHP_OS == 'Linux' ) { |
| 83 | if ( PHP_INT_SIZE == 4 ) { |
| 84 | $path = 'lua5_1_5_linux_32_generic/lua'; |
| 85 | } elseif ( PHP_INT_SIZE == 8 ) { |
| 86 | $path = 'lua5_1_5_linux_64_generic/lua'; |
| 87 | } |
| 88 | } elseif ( PHP_OS == 'Windows' || PHP_OS == 'WINNT' || PHP_OS == 'Win32' ) { |
| 89 | if ( PHP_INT_SIZE == 4 ) { |
| 90 | $path = 'lua5_1_5_Win32_bin/lua5.1.exe'; |
| 91 | } elseif ( PHP_INT_SIZE == 8 ) { |
| 92 | $path = 'lua5_1_5_Win64_bin/lua5.1.exe'; |
| 93 | } |
| 94 | } elseif ( PHP_OS == 'Darwin' ) { |
| 95 | $path = 'lua5_1_5_mac_lion_fat_generic/lua'; |
| 96 | } |
| 97 | if ( $path === false ) { |
| 98 | throw new LuaInterpreterNotFoundError( |
| 99 | 'No Lua interpreter was given in the configuration, ' . |
| 100 | 'and no bundled binary exists for this platform.' ); |
| 101 | } |
| 102 | $options['luaPath'] = __DIR__ . "/binaries/$path"; |
| 103 | |
| 104 | if ( !is_executable( $options['luaPath'] ) ) { |
| 105 | throw new LuaInterpreterNotExecutableError( |
| 106 | sprintf( 'The lua binary (%s) is not executable.', $options['luaPath'] ) |
| 107 | ); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | $this->engine = $engine; |
| 112 | $this->enableDebug = !empty( $options['debug'] ); |
| 113 | $this->logger = $options['logger'] ?? new NullLogger(); |
| 114 | |
| 115 | $pipes = null; |
| 116 | $cmd = wfEscapeShellArg( |
| 117 | $options['luaPath'], |
| 118 | __DIR__ . '/mw_main.lua', |
| 119 | dirname( dirname( __DIR__ ) ), |
| 120 | (string)$this->id, |
| 121 | (string)PHP_INT_SIZE |
| 122 | ); |
| 123 | if ( php_uname( 's' ) == 'Linux' ) { |
| 124 | // Limit memory and CPU |
| 125 | $cmd = wfEscapeShellArg( |
| 126 | # proc_open() passes $cmd to 'sh -c' on Linux, so add an 'exec' to bypass it |
| 127 | 'exec', |
| 128 | '/bin/sh', |
| 129 | __DIR__ . '/lua_ulimit.sh', |
| 130 | # soft limit (SIGXCPU) |
| 131 | (string)$options['cpuLimit'], |
| 132 | # hard limit |
| 133 | (string)( $options['cpuLimit'] + 1 ), |
| 134 | (string)intval( $options['memoryLimit'] / 1024 ), |
| 135 | $cmd ); |
| 136 | } |
| 137 | |
| 138 | if ( php_uname( 's' ) == 'Windows NT' ) { |
| 139 | // Like the passthru() in older versions of PHP, |
| 140 | // PHP's invokation of cmd.exe in proc_open() is broken: |
| 141 | // http://news.php.net/php.internals/21796 |
| 142 | // Unlike passthru(), it is not fixed in any PHP version, |
| 143 | // so we use the fix similar to one in wfShellExec() |
| 144 | $cmd = '"' . $cmd . '"'; |
| 145 | } |
| 146 | |
| 147 | $this->logger->debug( __METHOD__ . ": creating interpreter: $cmd" ); |
| 148 | |
| 149 | // Check whether proc_open is available before trying to call it (e.g. |
| 150 | // PHP's disable_functions may have removed it) |
| 151 | if ( !function_exists( 'proc_open' ) ) { |
| 152 | throw $this->engine->newException( 'scribunto-luastandalone-proc-error-proc-open' ); |
| 153 | } |
| 154 | |
| 155 | // Clear the "last error", so if proc_open fails we can know any |
| 156 | // warning was generated by that. |
| 157 | error_clear_last(); |
| 158 | |
| 159 | $this->proc = proc_open( |
| 160 | $cmd, |
| 161 | [ |
| 162 | [ 'pipe', 'r' ], |
| 163 | [ 'pipe', 'w' ], |
| 164 | [ 'file', $options['errorFile'], 'a' ] |
| 165 | ], |
| 166 | $pipes ); |
| 167 | if ( !$this->proc ) { |
| 168 | $err = error_get_last(); |
| 169 | if ( !empty( $err['message'] ) ) { |
| 170 | throw $this->engine->newException( 'scribunto-luastandalone-proc-error-msg', |
| 171 | [ 'args' => [ $err['message'] ] ] ); |
| 172 | } else { |
| 173 | throw $this->engine->newException( 'scribunto-luastandalone-proc-error' ); |
| 174 | } |
| 175 | } |
| 176 | $this->writePipe = $pipes[0]; |
| 177 | $this->readPipe = $pipes[1]; |
| 178 | } |
| 179 | |
| 180 | public function __destruct() { |
| 181 | $this->terminate(); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Fetch the Lua version |
| 186 | * @param array $options Engine options |
| 187 | * @return string|null |
| 188 | */ |
| 189 | public static function getLuaVersion( array $options ) { |
| 190 | if ( $options['luaPath'] === null ) { |
| 191 | // We know which versions are distributed, no need to run them. |
| 192 | if ( PHP_OS == 'Linux' ) { |
| 193 | return 'Lua 5.1.5'; |
| 194 | } elseif ( PHP_OS == 'Windows' || PHP_OS == 'WINNT' || PHP_OS == 'Win32' ) { |
| 195 | return 'Lua 5.1.5'; |
| 196 | } elseif ( PHP_OS == 'Darwin' ) { |
| 197 | return 'Lua 5.1.5'; |
| 198 | } else { |
| 199 | return null; |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | // Ask the interpreter what version it is, using the "-v" option. |
| 204 | // The output is expected to be one line, something like these: |
| 205 | // Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio |
| 206 | // LuaJIT 2.0.0 -- Copyright (C) 2005-2012 Mike Pall. http://luajit.org/ |
| 207 | $cmd = wfEscapeShellArg( $options['luaPath'] ) . ' -v'; |
| 208 | $handle = popen( $cmd, 'r' ); |
| 209 | if ( $handle ) { |
| 210 | $ret = fgets( $handle, 80 ); |
| 211 | pclose( $handle ); |
| 212 | if ( $ret && preg_match( '/^Lua(?:JIT)? \S+/', $ret, $m ) ) { |
| 213 | return $m[0]; |
| 214 | } |
| 215 | } |
| 216 | return null; |
| 217 | } |
| 218 | |
| 219 | public function terminate() { |
| 220 | if ( $this->proc ) { |
| 221 | $this->logger->debug( __METHOD__ . ": terminating" ); |
| 222 | proc_terminate( $this->proc ); |
| 223 | proc_close( $this->proc ); |
| 224 | $this->proc = false; |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | public function quit() { |
| 229 | if ( !$this->proc ) { |
| 230 | return; |
| 231 | } |
| 232 | $this->dispatch( [ 'op' => 'quit' ] ); |
| 233 | proc_close( $this->proc ); |
| 234 | } |
| 235 | |
| 236 | public function testquit() { |
| 237 | if ( !$this->proc ) { |
| 238 | return; |
| 239 | } |
| 240 | $this->dispatch( [ 'op' => 'testquit' ] ); |
| 241 | proc_close( $this->proc ); |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * @param string $text |
| 246 | * @param string $chunkName |
| 247 | * @return LuaStandaloneInterpreterFunction |
| 248 | */ |
| 249 | public function loadString( $text, $chunkName ) { |
| 250 | $this->cleanupLuaChunks(); |
| 251 | |
| 252 | $result = $this->dispatch( [ |
| 253 | 'op' => 'loadString', |
| 254 | 'text' => $text, |
| 255 | 'chunkName' => $chunkName |
| 256 | ] ); |
| 257 | return new LuaStandaloneInterpreterFunction( $this->id, $result[1] ); |
| 258 | } |
| 259 | |
| 260 | /** @inheritDoc */ |
| 261 | public function callFunction( $func, ...$args ) { |
| 262 | if ( !( $func instanceof LuaStandaloneInterpreterFunction ) ) { |
| 263 | throw new InvalidArgumentException( __METHOD__ . ': invalid function type' ); |
| 264 | } |
| 265 | if ( $func->interpreterId !== $this->id ) { |
| 266 | throw new InvalidArgumentException( __METHOD__ . ': function belongs to a different interpreter' ); |
| 267 | } |
| 268 | $args = func_get_args(); |
| 269 | unset( $args[0] ); |
| 270 | // $args is now conveniently a 1-based array, as required by the Lua server |
| 271 | |
| 272 | $this->cleanupLuaChunks(); |
| 273 | |
| 274 | $result = $this->dispatch( [ |
| 275 | 'op' => 'call', |
| 276 | 'id' => $func->id, |
| 277 | 'nargs' => count( $args ), |
| 278 | 'args' => $args, |
| 279 | ] ); |
| 280 | // Convert return values to zero-based |
| 281 | return array_values( $result ); |
| 282 | } |
| 283 | |
| 284 | /** @inheritDoc */ |
| 285 | public function wrapPhpFunction( $callable ) { |
| 286 | static $uid = 0; |
| 287 | $id = "anonymous*" . ++$uid; |
| 288 | $this->callbacks[$id] = $callable; |
| 289 | $ret = $this->dispatch( [ |
| 290 | 'op' => 'wrapPhpFunction', |
| 291 | 'id' => $id, |
| 292 | ] ); |
| 293 | return $ret[1]; |
| 294 | } |
| 295 | |
| 296 | public function cleanupLuaChunks() { |
| 297 | if ( isset( LuaStandaloneInterpreterFunction::$anyChunksDestroyed[$this->id] ) ) { |
| 298 | unset( LuaStandaloneInterpreterFunction::$anyChunksDestroyed[$this->id] ); |
| 299 | $this->dispatch( [ |
| 300 | 'op' => 'cleanupChunks', |
| 301 | 'ids' => LuaStandaloneInterpreterFunction::$activeChunkIds[$this->id] |
| 302 | ] ); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | /** @inheritDoc */ |
| 307 | public function isLuaFunction( $object ) { |
| 308 | return $object instanceof LuaStandaloneInterpreterFunction; |
| 309 | } |
| 310 | |
| 311 | /** @inheritDoc */ |
| 312 | public function registerLibrary( $name, array $functions ) { |
| 313 | // Make sure all ids are unique, even when libraries share the same name |
| 314 | // which is especially relevant for "mw_interface" (T211203). |
| 315 | static $uid = 0; |
| 316 | $uid++; |
| 317 | |
| 318 | $functionIds = []; |
| 319 | foreach ( $functions as $funcName => $callback ) { |
| 320 | $id = "$name-$funcName-$uid"; |
| 321 | $this->callbacks[$id] = $callback; |
| 322 | $functionIds[$funcName] = $id; |
| 323 | } |
| 324 | $this->dispatch( [ |
| 325 | 'op' => 'registerLibrary', |
| 326 | 'name' => $name, |
| 327 | 'functions' => $functionIds, |
| 328 | ] ); |
| 329 | } |
| 330 | |
| 331 | /** |
| 332 | * Get interpreter status |
| 333 | * @return array |
| 334 | */ |
| 335 | public function getStatus() { |
| 336 | $result = $this->dispatch( [ |
| 337 | 'op' => 'getStatus', |
| 338 | ] ); |
| 339 | return $result[1]; |
| 340 | } |
| 341 | |
| 342 | public function pauseUsageTimer() { |
| 343 | } |
| 344 | |
| 345 | public function unpauseUsageTimer() { |
| 346 | } |
| 347 | |
| 348 | /** |
| 349 | * Fill in missing nulls in a list received from Lua |
| 350 | * |
| 351 | * @param array $array List received from Lua |
| 352 | * @param int $count Number of values that should be in the list |
| 353 | * @return array Non-sparse array |
| 354 | */ |
| 355 | private static function fixNulls( array $array, $count ) { |
| 356 | if ( count( $array ) === $count ) { |
| 357 | return $array; |
| 358 | } else { |
| 359 | return array_replace( array_fill( 1, $count, null ), $array ); |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | /** |
| 364 | * Handle a protocol 'call' message from Lua |
| 365 | * @param array $message |
| 366 | * @return array Response message to send to Lua |
| 367 | */ |
| 368 | protected function handleCall( $message ) { |
| 369 | $message['args'] = self::fixNulls( $message['args'], $message['nargs'] ); |
| 370 | try { |
| 371 | $result = $this->callback( $message['id'], $message['args'] ); |
| 372 | } catch ( LuaError $e ) { |
| 373 | return [ |
| 374 | 'op' => 'error', |
| 375 | 'value' => $e->getLuaMessage(), |
| 376 | ]; |
| 377 | } |
| 378 | |
| 379 | // Convert to a 1-based array |
| 380 | if ( $result !== null && count( $result ) ) { |
| 381 | $result = array_combine( range( 1, count( $result ) ), $result ); |
| 382 | } else { |
| 383 | $result = []; |
| 384 | } |
| 385 | |
| 386 | return [ |
| 387 | 'op' => 'return', |
| 388 | 'nvalues' => count( $result ), |
| 389 | 'values' => $result |
| 390 | ]; |
| 391 | } |
| 392 | |
| 393 | /** |
| 394 | * Call a registered/wrapped PHP function from Lua |
| 395 | * @param string $id Callback ID |
| 396 | * @param array $args Arguments to pass to the callback |
| 397 | * @return mixed Return value from the callback |
| 398 | */ |
| 399 | protected function callback( $id, array $args ) { |
| 400 | return ( $this->callbacks[$id] )( ...$args ); |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * Handle a protocol error response |
| 405 | * |
| 406 | * Converts the encoded Lua error to an appropriate exception and throws it. |
| 407 | * |
| 408 | * @param array $message |
| 409 | * @return never |
| 410 | */ |
| 411 | protected function handleError( $message ) { |
| 412 | $opts = []; |
| 413 | $message['value'] = Validator::cleanUp( $message['value'] ); |
| 414 | if ( preg_match( '/^(.*?):(\d+): (.*)$/', $message['value'], $m ) ) { |
| 415 | $opts['module'] = $m[1]; |
| 416 | $opts['line'] = $m[2]; |
| 417 | $message['value'] = $m[3]; |
| 418 | } |
| 419 | if ( isset( $message['trace'] ) ) { |
| 420 | foreach ( $message['trace'] as &$val ) { |
| 421 | $val = array_map( static function ( $val ) { |
| 422 | if ( is_string( $val ) ) { |
| 423 | $val = Validator::cleanUp( $val ); |
| 424 | } |
| 425 | return $val; |
| 426 | }, $val ); |
| 427 | } |
| 428 | $opts['trace'] = array_values( $message['trace'] ); |
| 429 | } |
| 430 | throw $this->engine->newLuaError( $message['value'], $opts ); |
| 431 | } |
| 432 | |
| 433 | /** |
| 434 | * Send a protocol message to Lua, and handle any responses |
| 435 | * @param array $msgToLua |
| 436 | * @return mixed Response data |
| 437 | */ |
| 438 | protected function dispatch( $msgToLua ) { |
| 439 | $this->sendMessage( $msgToLua ); |
| 440 | while ( true ) { |
| 441 | $msgFromLua = $this->receiveMessage(); |
| 442 | |
| 443 | switch ( $msgFromLua['op'] ) { |
| 444 | case 'return': |
| 445 | return self::fixNulls( $msgFromLua['values'], $msgFromLua['nvalues'] ); |
| 446 | case 'call': |
| 447 | $msgToLua = $this->handleCall( $msgFromLua ); |
| 448 | $this->sendMessage( $msgToLua ); |
| 449 | break; |
| 450 | case 'error': |
| 451 | $this->handleError( $msgFromLua ); |
| 452 | // handleError prevents continuation |
| 453 | default: |
| 454 | $this->logger->error( __METHOD__ . ": invalid response op \"{$msgFromLua['op']}\"" ); |
| 455 | throw $this->engine->newException( 'scribunto-luastandalone-decode-error' ); |
| 456 | } |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | /** |
| 461 | * Send a protocol message to Lua |
| 462 | * @param array $msg |
| 463 | */ |
| 464 | protected function sendMessage( $msg ) { |
| 465 | $this->debug( "TX ==> {$msg['op']}" ); |
| 466 | $this->checkValid(); |
| 467 | // Send the message |
| 468 | $encMsg = $this->encodeMessage( $msg ); |
| 469 | if ( !fwrite( $this->writePipe, $encMsg ) ) { |
| 470 | // Write error, probably the process has terminated |
| 471 | // If it has, handleIOError() will throw. If not, throw an exception ourselves. |
| 472 | $this->handleIOError(); |
| 473 | throw $this->engine->newException( 'scribunto-luastandalone-write-error' ); |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | /** |
| 478 | * Receive a protocol message from Lua |
| 479 | * @return array |
| 480 | */ |
| 481 | protected function receiveMessage() { |
| 482 | $this->checkValid(); |
| 483 | // Read the header |
| 484 | $header = fread( $this->readPipe, 16 ); |
| 485 | if ( strlen( $header ) !== 16 ) { |
| 486 | $this->handleIOError(); |
| 487 | throw $this->engine->newException( 'scribunto-luastandalone-read-error' ); |
| 488 | } |
| 489 | $length = $this->decodeHeader( $header ); |
| 490 | |
| 491 | // Read the reply body |
| 492 | $body = ''; |
| 493 | $lengthRemaining = $length; |
| 494 | while ( $lengthRemaining ) { |
| 495 | $buffer = fread( $this->readPipe, $lengthRemaining ); |
| 496 | if ( $buffer === false || feof( $this->readPipe ) ) { |
| 497 | $this->handleIOError(); |
| 498 | throw $this->engine->newException( 'scribunto-luastandalone-read-error' ); |
| 499 | } |
| 500 | $body .= $buffer; |
| 501 | $lengthRemaining -= strlen( $buffer ); |
| 502 | } |
| 503 | $body = strtr( $body, [ |
| 504 | '\\r' => "\r", |
| 505 | '\\n' => "\n", |
| 506 | '\\\\' => '\\', |
| 507 | ] ); |
| 508 | $msg = unserialize( $body ); |
| 509 | $this->debug( "RX <== {$msg['op']}" ); |
| 510 | return $msg; |
| 511 | } |
| 512 | |
| 513 | /** |
| 514 | * Encode a protocol message to send to Lua |
| 515 | * @param mixed $message |
| 516 | * @return string |
| 517 | */ |
| 518 | protected function encodeMessage( $message ) { |
| 519 | $serialized = $this->encodeLuaVar( $message ); |
| 520 | $length = strlen( $serialized ); |
| 521 | $check = $length * 2 - 1; |
| 522 | |
| 523 | return sprintf( '%08x%08x%s', $length, $check, $serialized ); |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * @param mixed $var |
| 528 | * @param int $level |
| 529 | * |
| 530 | * @return string |
| 531 | */ |
| 532 | protected function encodeLuaVar( $var, $level = 0 ) { |
| 533 | if ( $level > 100 ) { |
| 534 | throw new RuntimeException( __METHOD__ . ': recursion depth limit exceeded' ); |
| 535 | } |
| 536 | $type = gettype( $var ); |
| 537 | switch ( $type ) { |
| 538 | case 'boolean': |
| 539 | return $var ? 'true' : 'false'; |
| 540 | case 'integer': |
| 541 | return $var; |
| 542 | case 'double': |
| 543 | if ( !is_finite( $var ) ) { |
| 544 | if ( is_nan( $var ) ) { |
| 545 | return '(0/0)'; |
| 546 | } |
| 547 | if ( $var === INF ) { |
| 548 | return '(1/0)'; |
| 549 | } |
| 550 | if ( $var === -INF ) { |
| 551 | return '(-1/0)'; |
| 552 | } |
| 553 | throw new InvalidArgumentException( __METHOD__ . ': cannot convert non-finite number' ); |
| 554 | } |
| 555 | return sprintf( '%.17g', $var ); |
| 556 | case 'string': |
| 557 | return '"' . |
| 558 | strtr( $var, [ |
| 559 | '"' => '\\"', |
| 560 | '\\' => '\\\\', |
| 561 | "\n" => '\\n', |
| 562 | "\r" => '\\r', |
| 563 | "\000" => '\\000', |
| 564 | ] ) . |
| 565 | '"'; |
| 566 | case 'array': |
| 567 | $s = '{'; |
| 568 | foreach ( $var as $key => $element ) { |
| 569 | if ( $s !== '{' ) { |
| 570 | $s .= ','; |
| 571 | } |
| 572 | |
| 573 | // Lua's number type can't represent most integers beyond 2**53, so stringify such keys |
| 574 | if ( is_int( $key ) && ( $key > 9007199254740992 || $key < -9007199254740992 ) ) { |
| 575 | $key = (string)$key; |
| 576 | } |
| 577 | |
| 578 | $s .= '[' . $this->encodeLuaVar( $key, $level + 1 ) . ']' . |
| 579 | '=' . $this->encodeLuaVar( $element, $level + 1 ); |
| 580 | } |
| 581 | $s .= '}'; |
| 582 | return $s; |
| 583 | case 'object': |
| 584 | if ( !( $var instanceof LuaStandaloneInterpreterFunction ) ) { |
| 585 | throw new InvalidArgumentException( __METHOD__ . ': unable to convert object of type ' . |
| 586 | get_class( $var ) ); |
| 587 | } elseif ( $var->interpreterId !== $this->id ) { |
| 588 | throw new InvalidArgumentException( |
| 589 | __METHOD__ . ': unable to convert function belonging to a different interpreter' |
| 590 | ); |
| 591 | } else { |
| 592 | return 'chunks[' . intval( $var->id ) . ']'; |
| 593 | } |
| 594 | case 'resource': |
| 595 | throw new InvalidArgumentException( __METHOD__ . ': unable to convert resource' ); |
| 596 | case 'NULL': |
| 597 | return 'nil'; |
| 598 | default: |
| 599 | throw new InvalidArgumentException( __METHOD__ . ': unable to convert variable of unknown type' ); |
| 600 | } |
| 601 | } |
| 602 | |
| 603 | /** |
| 604 | * Verify protocol header and extract the body length. |
| 605 | * @param string $header |
| 606 | * @return int Length |
| 607 | */ |
| 608 | protected function decodeHeader( $header ) { |
| 609 | $length = substr( $header, 0, 8 ); |
| 610 | $check = substr( $header, 8, 8 ); |
| 611 | if ( !preg_match( '/^[0-9a-f]+$/', $length ) || !preg_match( '/^[0-9a-f]+$/', $check ) ) { |
| 612 | throw $this->engine->newException( 'scribunto-luastandalone-decode-error' ); |
| 613 | } |
| 614 | $length = hexdec( $length ); |
| 615 | $check = hexdec( $check ); |
| 616 | if ( $length * 2 - 1 !== $check ) { |
| 617 | throw $this->engine->newException( 'scribunto-luastandalone-decode-error' ); |
| 618 | } |
| 619 | return $length; |
| 620 | } |
| 621 | |
| 622 | /** |
| 623 | * @throws ScribuntoException |
| 624 | */ |
| 625 | protected function checkValid() { |
| 626 | if ( !$this->proc ) { |
| 627 | $this->logger->error( __METHOD__ . ": process already terminated" ); |
| 628 | if ( $this->exitError ) { |
| 629 | throw $this->exitError; |
| 630 | } else { |
| 631 | throw $this->engine->newException( 'scribunto-luastandalone-gone' ); |
| 632 | } |
| 633 | } |
| 634 | } |
| 635 | |
| 636 | /** |
| 637 | * @throws ScribuntoException |
| 638 | */ |
| 639 | protected function handleIOError() { |
| 640 | $this->checkValid(); |
| 641 | |
| 642 | // Terminate, fetch the status, then close. proc_close()'s return |
| 643 | // value isn't helpful here because there's no way to differentiate a |
| 644 | // signal-kill from a normal exit. |
| 645 | proc_terminate( $this->proc ); |
| 646 | while ( true ) { |
| 647 | $status = proc_get_status( $this->proc ); |
| 648 | // XXX: Should proc_get_status docs be changed so that |
| 649 | // its documented as possibly returning false? |
| 650 | '@phan-var array|false $status'; |
| 651 | if ( $status === false ) { |
| 652 | // WTF? Let the caller throw an appropriate error. |
| 653 | return; |
| 654 | } |
| 655 | if ( !$status['running'] ) { |
| 656 | break; |
| 657 | } |
| 658 | // Give the killed process a chance to be scheduled |
| 659 | usleep( 10000 ); |
| 660 | } |
| 661 | proc_close( $this->proc ); |
| 662 | $this->proc = false; |
| 663 | |
| 664 | // proc_open() sometimes uses a shell, check for shell-style signal reporting. |
| 665 | if ( !$status['signaled'] && ( $status['exitcode'] & 0x80 ) === 0x80 ) { |
| 666 | $status['signaled'] = true; |
| 667 | $status['termsig'] = $status['exitcode'] - 128; |
| 668 | } |
| 669 | |
| 670 | if ( $status['signaled'] ) { |
| 671 | if ( defined( 'SIGXCPU' ) && $status['termsig'] === SIGXCPU ) { |
| 672 | $this->exitError = $this->engine->newException( 'scribunto-common-timeout' ); |
| 673 | } else { |
| 674 | $this->exitError = $this->engine->newException( 'scribunto-luastandalone-signal', |
| 675 | [ 'args' => [ $status['termsig'] ] ] ); |
| 676 | } |
| 677 | } else { |
| 678 | $this->exitError = $this->engine->newException( 'scribunto-luastandalone-exited', |
| 679 | [ 'args' => [ $status['exitcode'] ] ] ); |
| 680 | } |
| 681 | throw $this->exitError; |
| 682 | } |
| 683 | |
| 684 | /** |
| 685 | * @param string $msg |
| 686 | */ |
| 687 | protected function debug( $msg ) { |
| 688 | if ( $this->enableDebug ) { |
| 689 | $this->logger->debug( "Lua: $msg" ); |
| 690 | } |
| 691 | } |
| 692 | } |