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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| <?php | ||
|
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| declare(strict_types=1); | ||
|
|
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| namespace Psl\IO; | ||
|
|
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| use Generator; | ||
| use Psl; | ||
| use Psl\Channel; | ||
| use Psl\Result; | ||
| use Psl\Str; | ||
| use Revolt\EventLoop; | ||
|
|
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| /** | ||
| * Streaming the output of the given read stream handles using a generator. | ||
| * | ||
| * Example: | ||
| * | ||
| * $handles = [ | ||
| * 'foo' => get_read_stream('foo'), | ||
| * 'bar' => get_read_stream('bar'), | ||
| * ]; | ||
| * | ||
| * foreach(IO\streaming($handles) as $type => $chunk) { | ||
| * IO\write_line('received chunk "%s" from "%s" stream', $chunk, $type); | ||
| * } | ||
| * | ||
| * @template T of array-key | ||
| * | ||
| * @param iterable<T, ReadStreamHandleInterface> $handles | ||
| * | ||
| * @throws Exception\AlreadyClosedException If one of the handles has been already closed. | ||
| * @throws Exception\RuntimeException If an error occurred during the operation. | ||
| * @throws Exception\TimeoutException If $timeout is reached before being able to read all the handles until the end. | ||
| * | ||
| * @return Generator<T, string, mixed, void> | ||
| */ | ||
| function streaming(iterable $handles, ?float $timeout = null): Generator | ||
| { | ||
| /** | ||
| * @psalm-suppress UnnecessaryVarAnnotation | ||
| * | ||
| * @var Channel\ReceiverInterface<array{T|null, Result\ResultInterface<string>}> $receiver | ||
| * | ||
| * @psalm-suppress UnnecessaryVarAnnotation | ||
| * | ||
| * @var Channel\SenderInterface<array{T|null, Result\ResultInterface<string>}> $sender | ||
| */ | ||
| [$receiver, $sender] = Channel\unbounded(); | ||
|
|
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| /** @var Psl\Ref<array<T, string>> $watchers */ | ||
| $watchers = new Psl\Ref([]); | ||
| foreach ($handles as $index => $handle) { | ||
| $stream = $handle->getStream(); | ||
| if ($stream === null) { | ||
| throw new Exception\AlreadyClosedException(Str\format('Handle "%s" is already closed.', (string) $index)); | ||
| } | ||
|
|
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| $watchers->value[$index] = EventLoop::onReadable($stream, static function (string $watcher) use ($index, $handle, $sender, $watchers): void { | ||
| try { | ||
| $result = Result\wrap($handle->tryRead(...)); | ||
| if ($result->isFailed() || ($result->isSucceeded() && $result->getResult() === '')) { | ||
| EventLoop::cancel($watcher); | ||
| unset($watchers->value[$index]); | ||
| } | ||
|
|
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| $sender->send([$index, $result]); | ||
| } finally { | ||
| if ($watchers->value === []) { | ||
| $sender->close(); | ||
| } | ||
| } | ||
| }); | ||
| } | ||
|
|
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| $timeout_watcher = null; | ||
| if ($timeout !== null) { | ||
| $timeout_watcher = EventLoop::delay($timeout, static function () use ($sender): void { | ||
| /** @var Result\ResultInterface<string> $failure */ | ||
| $failure = new Result\Failure( | ||
| new Exception\TimeoutException('Reached timeout before being able to read all the handles until the end.') | ||
| ); | ||
|
|
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| $sender->send([null, $failure]); | ||
| }); | ||
| } | ||
|
|
||
| try { | ||
| while (true) { | ||
| [$index, $result] = $receiver->receive(); | ||
| if (null === $index || $result->isFailed()) { | ||
| throw $result->getThrowable(); | ||
| } | ||
|
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| yield $index => $result->getResult(); | ||
| } | ||
| } catch (Channel\Exception\ClosedChannelException) { | ||
| // completed. | ||
| return; | ||
| } finally { | ||
| if ($timeout_watcher !== null) { | ||
| EventLoop::cancel($timeout_watcher); | ||
| } | ||
|
|
||
| foreach ($watchers->value as $watcher) { | ||
| EventLoop::cancel($watcher); | ||
| } | ||
| } | ||
| } |
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