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parallel/lib/Context/Internal/process-runner.php

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<?php
namespace Amp\Parallel\Context\Internal;
use Amp\Parallel\Context\Process;
use Amp\Parallel\Sync;
use Amp\Promise;
use function Amp\call;
// Doesn't exist in phpdbg...
if (\function_exists("cli_set_process_title")) {
@\cli_set_process_title("amp-process");
}
(function () {
$paths = [
\dirname(__DIR__, 5) . "/autoload.php",
\dirname(__DIR__, 3) . "/vendor/autoload.php",
];
foreach ($paths as $path) {
if (\file_exists($path)) {
$autoloadPath = $path;
break;
}
}
if (!isset($autoloadPath)) {
\trigger_error("Could not locate autoload.php in any of the following files: " . \implode(", ", $paths), E_USER_ERROR);
exit(1);
}
require $autoloadPath;
})();
(function () use ($argc, $argv) {
// Remove this scripts path from process arguments.
--$argc;
\array_shift($argv);
if (!isset($argv[0])) {
throw new \Error("No socket path provided");
}
// Remove socket path from process arguments.
--$argc;
$uri = \array_shift($argv);
$key = "";
// Read random key from STDIN and send back to parent over IPC socket to authenticate.
do {
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if (($chunk = \fread(\STDIN, Process::KEY_LENGTH)) === false || \feof(\STDIN)) {
\trigger_error("Could not read key from parent", E_USER_ERROR);
exit(1);
}
$key .= $chunk;
} while (\strlen($key) < Process::KEY_LENGTH);
if (!$socket = \stream_socket_client($uri, $errno, $errstr, 5, \STREAM_CLIENT_CONNECT)) {
\trigger_error("Could not connect to IPC socket", E_USER_ERROR);
exit(1);
}
$channel = new Sync\ChannelledSocket($socket, $socket);
try {
Promise\wait($channel->send($key));
} catch (\Throwable $exception) {
\trigger_error("Could not send key to parent", E_USER_ERROR);
exit(1);
}
try {
if (!isset($argv[0])) {
throw new \Error("No script path given");
}
if (!\is_file($argv[0])) {
throw new \Error(\sprintf("No script found at '%s' (be sure to provide the full path to the script)", $argv[0]));
}
// Protect current scope by requiring script within another function.
$callable = (function () use ($argc, $argv) { // Using $argc so it is available to the required script.
return require $argv[0];
})();
if (!\is_callable($callable)) {
throw new \Error(\sprintf("Script '%s' did not return a callable function", $argv[0]));
}
$result = new Sync\ExitSuccess(Promise\wait(call($callable, $channel)));
} catch (\Throwable $exception) {
$result = new Sync\ExitFailure($exception);
}
try {
Promise\wait(call(function () use ($channel, $result) {
try {
yield $channel->send($result);
} catch (Sync\SerializationException $exception) {
// Serializing the result failed. Send the reason why.
yield $channel->send(new Sync\ExitFailure($exception));
}
}));
} catch (\Throwable $exception) {
\trigger_error("Could not send result to parent; be sure to shutdown the child before ending the parent", E_USER_ERROR);
exit(1);
}
})();