208 lines
8.3 KiB
PHP
208 lines
8.3 KiB
PHP
<?php
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namespace WP_Ultimo\Dependencies\Amp\Process\Internal\Posix;
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use WP_Ultimo\Dependencies\Amp\ByteStream\ResourceInputStream;
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use WP_Ultimo\Dependencies\Amp\ByteStream\ResourceOutputStream;
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use WP_Ultimo\Dependencies\Amp\Deferred;
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use WP_Ultimo\Dependencies\Amp\Loop;
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use WP_Ultimo\Dependencies\Amp\Process\Internal\ProcessHandle;
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use WP_Ultimo\Dependencies\Amp\Process\Internal\ProcessRunner;
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use WP_Ultimo\Dependencies\Amp\Process\Internal\ProcessStatus;
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use WP_Ultimo\Dependencies\Amp\Process\ProcessException;
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use WP_Ultimo\Dependencies\Amp\Process\ProcessInputStream;
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use WP_Ultimo\Dependencies\Amp\Process\ProcessOutputStream;
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use WP_Ultimo\Dependencies\Amp\Promise;
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/** @internal */
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final class Runner implements ProcessRunner
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{
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const FD_SPEC = [
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["pipe", "r"],
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// stdin
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["pipe", "w"],
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// stdout
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["pipe", "w"],
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// stderr
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["pipe", "w"],
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];
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/** @var string|null */
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private static $fdPath;
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public static function onProcessEndExtraDataPipeReadable($watcher, $stream, Handle $handle)
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{
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Loop::cancel($watcher);
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$handle->extraDataPipeWatcher = null;
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$handle->status = ProcessStatus::ENDED;
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if (!\is_resource($stream) || \feof($stream)) {
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$handle->joinDeferred->fail(new ProcessException("Process ended unexpectedly"));
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} else {
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$handle->joinDeferred->resolve((int) \rtrim(@\stream_get_contents($stream)));
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}
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$handle->wait();
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}
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public static function onProcessStartExtraDataPipeReadable($watcher, $stream, $data)
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{
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Loop::cancel($watcher);
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$pid = \rtrim(@\fgets($stream));
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/** @var $deferreds Deferred[] */
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list($handle, $pipes, $deferreds) = $data;
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if (!$pid || !\is_numeric($pid)) {
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$error = new ProcessException("Could not determine PID");
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$handle->pidDeferred->fail($error);
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foreach ($deferreds as $deferred) {
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/** @var $deferred Deferred */
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$deferred->fail($error);
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}
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if ($handle->status < ProcessStatus::ENDED) {
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$handle->status = ProcessStatus::ENDED;
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$handle->joinDeferred->fail($error);
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}
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return;
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}
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$handle->status = ProcessStatus::RUNNING;
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$handle->pidDeferred->resolve((int) $pid);
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$deferreds[0]->resolve($pipes[0]);
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$deferreds[1]->resolve($pipes[1]);
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$deferreds[2]->resolve($pipes[2]);
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if ($handle->extraDataPipeWatcher !== null) {
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Loop::enable($handle->extraDataPipeWatcher);
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}
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}
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/** @inheritdoc */
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public function start(string $command, string $cwd = null, array $env = [], array $options = []) : ProcessHandle
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{
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$command = \sprintf('{ (%s) <&3 3<&- 3>/dev/null & } 3<&0; trap "" INT TERM QUIT HUP;' . 'pid=$!; echo $pid >&3; wait $pid; RC=$?; echo $RC >&3; exit $RC', $command);
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$handle = new Handle();
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$handle->proc = @\proc_open($command, $this->generateFds(), $pipes, $cwd ?: null, $env ?: null, $options);
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if (!\is_resource($handle->proc)) {
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$message = "Could not start process";
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if ($error = \error_get_last()) {
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$message .= \sprintf(" Errno: %d; %s", $error["type"], $error["message"]);
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}
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throw new ProcessException($message);
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}
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$status = \proc_get_status($handle->proc);
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if (!$status) {
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\proc_close($handle->proc);
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throw new ProcessException("Could not get process status");
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}
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$handle->shellPid = \proc_get_status($handle->proc)['pid'];
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$stdinDeferred = new Deferred();
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$handle->stdin = new ProcessOutputStream($stdinDeferred->promise());
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$stdoutDeferred = new Deferred();
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$handle->stdout = new ProcessInputStream($stdoutDeferred->promise());
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$stderrDeferred = new Deferred();
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$handle->stderr = new ProcessInputStream($stderrDeferred->promise());
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$handle->extraDataPipe = $pipes[3];
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\stream_set_blocking($pipes[3], \false);
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$handle->extraDataPipeStartWatcher = Loop::onReadable($pipes[3], [self::class, 'onProcessStartExtraDataPipeReadable'], [$handle, [new ResourceOutputStream($pipes[0]), new ResourceInputStream($pipes[1]), new ResourceInputStream($pipes[2])], [$stdinDeferred, $stdoutDeferred, $stderrDeferred]]);
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$handle->extraDataPipeWatcher = Loop::onReadable($pipes[3], [self::class, 'onProcessEndExtraDataPipeReadable'], $handle);
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Loop::unreference($handle->extraDataPipeWatcher);
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Loop::disable($handle->extraDataPipeWatcher);
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return $handle;
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}
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private function generateFds() : array
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{
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if (self::$fdPath === null) {
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self::$fdPath = \file_exists("/dev/fd") ? "/dev/fd" : "/proc/self/fd";
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}
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$fdList = @\scandir(self::$fdPath, \SCANDIR_SORT_NONE);
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if ($fdList === \false) {
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throw new ProcessException("Unable to list open file descriptors");
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}
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$fdList = \array_filter($fdList, function (string $path) : bool {
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return $path !== "." && $path !== "..";
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});
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$fds = [];
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foreach ($fdList as $id) {
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$fds[(int) $id] = ["file", "/dev/null", "r"];
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}
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return self::FD_SPEC + $fds;
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}
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/** @inheritdoc */
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public function join(ProcessHandle $handle) : Promise
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{
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/** @var Handle $handle */
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if ($handle->extraDataPipeWatcher !== null) {
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Loop::reference($handle->extraDataPipeWatcher);
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}
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return $handle->joinDeferred->promise();
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}
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/** @inheritdoc */
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public function kill(ProcessHandle $handle)
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{
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/** @var Handle $handle */
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if ($handle->extraDataPipeWatcher !== null) {
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Loop::cancel($handle->extraDataPipeWatcher);
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$handle->extraDataPipeWatcher = null;
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}
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/** @var Handle $handle */
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if ($handle->extraDataPipeStartWatcher !== null) {
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Loop::cancel($handle->extraDataPipeStartWatcher);
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$handle->extraDataPipeStartWatcher = null;
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}
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if (!\proc_terminate($handle->proc, 9)) {
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// Forcefully kill the process using SIGKILL.
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throw new ProcessException("Terminating process failed");
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}
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$handle->pidDeferred->promise()->onResolve(function ($error, $pid) {
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// The function should not call posix_kill() if $pid is null (i.e., there was an error starting the process).
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if ($error) {
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return;
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}
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// ignore errors because process not always detached
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@\posix_kill($pid, 9);
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});
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if ($handle->status < ProcessStatus::ENDED) {
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$handle->status = ProcessStatus::ENDED;
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$handle->joinDeferred->fail(new ProcessException("The process was killed"));
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}
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$this->free($handle);
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}
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/** @inheritdoc */
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public function signal(ProcessHandle $handle, int $signo)
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{
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$handle->pidDeferred->promise()->onResolve(function ($error, $pid) use($signo) {
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if ($error) {
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return;
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}
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@\posix_kill($pid, $signo);
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});
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}
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/** @inheritdoc */
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public function destroy(ProcessHandle $handle)
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{
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/** @var Handle $handle */
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if ($handle->status < ProcessStatus::ENDED && \getmypid() === $handle->originalParentPid) {
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try {
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$this->kill($handle);
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return;
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} catch (ProcessException $e) {
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// ignore
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}
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}
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$this->free($handle);
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}
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private function free(Handle $handle)
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{
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/** @var Handle $handle */
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if ($handle->extraDataPipeWatcher !== null) {
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Loop::cancel($handle->extraDataPipeWatcher);
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$handle->extraDataPipeWatcher = null;
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}
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/** @var Handle $handle */
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if ($handle->extraDataPipeStartWatcher !== null) {
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Loop::cancel($handle->extraDataPipeStartWatcher);
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$handle->extraDataPipeStartWatcher = null;
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}
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if (\is_resource($handle->extraDataPipe)) {
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\fclose($handle->extraDataPipe);
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}
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$handle->stdin->close();
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$handle->stdout->close();
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$handle->stderr->close();
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if (\is_resource($handle->proc)) {
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\proc_close($handle->proc);
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}
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}
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}
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