8000 Add Fiber-based `await()` function · reactphp/async@224be28 · GitHub
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clueWyriHaximus
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Add Fiber-based await() function
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4 files changed

+83
-31
lines changed

4 files changed

+83
-31
lines changed

‎composer.json

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@@ -37,6 +37,9 @@
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"react/event-loop": "You need an event loop for this to make sense."
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},
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"autoload": {
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"psr-4": {
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"React\\Async\\": "src/"
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},
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"files": [
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"src/functions_include.php"
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]

‎src/SimpleFiber.php

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@@ -0,0 +1,54 @@
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<?php
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namespace React\Async;
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use React\EventLoop\Loop;
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/**
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* @internal
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*/
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final class SimpleFiber
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{
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private ?\Fiber $fiber = null;
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public function __construct()
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{
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$this->fiber = \Fiber::getCurrent();
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}
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public function resume(mixed $value)
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{
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if ($this->fiber === null) {
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Loop::futureTick(static fn() => \Fiber::suspend(static fn() => $value));
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return;
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}
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Loop::futureTick(fn() => $this->fiber->resume($value));
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}
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public function throw(mixed $throwable)
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{
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if (!$throwable instanceof \Throwable) {
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$throwable = new \UnexpectedValueException(
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'Promise rejected with unexpected value of type ' . (is_object($throwable) ? get_class($throwable) : gettype($throwable))
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);
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}
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if ($this->fiber === null) {
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Loop::futureTick(static fn() => \Fiber::suspend(static fn() => throw $throwable));
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return;
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}
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Loop::futureTick(fn() => $this->fiber->throw($throwable));
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}
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public function suspend(): mixed
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{
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if ($this->fiber === null) {
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$fiber = fiber(static fn() => Loop::run());
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return ($fiber->isStarted() ? $fiber->resume() : $fiber->start())();
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}
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return \Fiber::suspend();
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}
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}

‎src/functions.php

Lines changed: 24 additions & 31 deletions
Original file line numberDiff line numberDiff line change
@@ -4,6 +4,7 @@
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use React\EventLoop\Loop;
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use React\Promise\Deferred;
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use React\Promise\Promise;
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use React\Promise\PromiseInterface;
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use function React\Promise\reject;
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@@ -50,48 +51,40 @@
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*/
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function await(PromiseInterface $promise): mixed
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{
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$wait = true;
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$resolved = null;
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$exception = null;
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$rejected = false;
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$fiber = new SimpleFiber();
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$promise->then(
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function ($c) use (&$resolved, &$wait) {
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$resolved = $c;
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$wait = false;
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Loop::stop();
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function (mixed $value) use (&$resolved, $fiber): void {
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$fiber->resume($value);
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},
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function ($error) use (&$exception, &$rejected, &$wait) {
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$exception = $error;
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$rejected = true;
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$wait = false;
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Loop::stop();
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function (mixed $throwable) use (&$resolved, $fiber): void {
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$fiber->throw($throwable);
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}
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);
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// Explicitly overwrite argument with null value. This ensure that this
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// argument does not show up in the stack trace in PHP 7+ only.
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$promise = null;
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while ($wait) {
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Loop::run();
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}
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if ($rejected) {
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// promise is rejected with an unexpected value (Promise API v1 or v2 only)
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if (!$exception instanceof \Throwable) {
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$exception = new \UnexpectedValueException(
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'Promise rejected with unexpected value of type ' . (is_object($exception) ? get_class($exception) : gettype($exception))
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);
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}
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return $fiber->suspend();
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}
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88-
throw $exception;
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/**
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* @internal
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*/
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function fiber(callable $callable): \Fiber
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{
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static $scheduler = null;
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if ($scheduler === null || $scheduler->isTerminated()) {
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$scheduler = new \Fiber($callable);
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// Run event loop to completion on shutdown.
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\register_shutdown_function(static function () use ($scheduler): void {
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if ($scheduler->isSuspended()) {
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$scheduler->resume();
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}
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});
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}
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91-
return $resolved;
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return $scheduler;
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}
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/**
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*
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* @template T

‎tests/AwaitTest.php

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Original file line numberDiff line numberDiff line change
@@ -72,6 +72,8 @@ public function testAwaitReturnsValueWhenPromiseIsFullfilled()
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public function testAwaitReturnsValueWhenPromiseIsFulfilledEvenWhenOtherTimerStopsLoop()
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{
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$this->markTestIncomplete();
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$promise = new Promise(function ($resolve) {
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Loop::addTimer(0.02, function () use ($resolve) {
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$resolve(2);

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