README

This package has now been migrated over to reactphp/async and only exists for BC reasons.

composer require "react/async:^4 || ^3 || ^2"

Only the await() function has been merged without its optional parameters $loop and $timeout, the rest of await() works as-is from the latest v1.5.0 release with no other significant changes. Simply update your code to use the updated namespace like this:

// old
$result = Clue\React\Block\await($promise);

// new
$result = React\Async\await($promise);

See reactphp/async for more details.

The below documentation applies to the last release of this package. Further development will take place in the updated reactphp/async, so you're highly recommended to upgrade as soon as possible.

Legacy clue/reactphp-block

Lightweight library that eases integrating async components built for ReactPHP in a traditional, blocking environment.

ReactPHP provides you a great set of base components and a huge ecosystem of third party libraries in order to perform async operations. The event-driven paradigm and asynchronous processing of any number of streams in real time enables you to build a whole new set of application on top of it. This is great for building modern, scalable applications from scratch and will likely result in you relying on a whole new software architecture.

But let's face it: Your day-to-day business is unlikely to allow you to build everything from scratch and ditch your existing production environment. This is where this library comes into play:

Let's block ReactPHP More specifically, this library eases the pain of integrating async components into your traditional, synchronous (blocking) application stack.

Table of contents

Support us
Quickstart example
Usage
- sleep()
- await()
- awaitAny()
- awaitAll()
Install
Tests
License

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Quickstart example

The following example code demonstrates how this library can be used along with an async HTTP client to process two non-blocking HTTP requests and block until the first (faster) one resolves.

function blockingExample()
{
    // this example uses an HTTP client
    // this could be pretty much everything that binds to an event loop
    $browser = new React\Http\Browser();

    // set up two parallel requests
    $request1 = $browser->get('http://www.google.com/');
    $request2 = $browser->get('http://www.google.co.uk/');

    // keep the loop running (i.e. block) until the first response arrives
    $fasterResponse = Clue\React\Block\awaitAny(array($request1, $request2));

    return $fasterResponse->getBody();
}

Usage

This lightweight library consists only of a few simple functions. All functions reside under the Clue\React\Block namespace.

The below examples refer to all functions with their fully-qualified names like this:

Clue\React\Block\await(…);

As of PHP 5.6+ you can also import each required function into your code like this:

use function Clue\React\Block\await;

await(…);

Alternatively, you can also use an import statement similar to this:

use Clue\React\Block;

Block\await(…);

sleep()

The sleep(float $seconds, ?LoopInterface $loop = null): void function can be used to wait/sleep for $time seconds.

Clue\React\Block\sleep(1.5, $loop);

This function will only return after the given $time has elapsed. In the meantime, the event loop will run any other events attached to the same loop until the timer fires. If there are no other events attached to this loop, it will behave similar to the built-in sleep().

Internally, the $time argument will be used as a timer for the loop so that it keeps running until this timer triggers. This implies that if you pass a really small (or negative) value, it will still start a timer and will thus trigger at the earliest possible time in the future.

This function takes an optional LoopInterface|null $loop parameter that can be used to pass the event loop instance to use. You can use a null value here in order to use the default loop. This value SHOULD NOT be given unless you're sure you want to explicitly use a given event loop instance.

Note that this function will assume control over the event loop. Internally, it will actually run() the loop until the timer fires and then calls stop() to terminate execution of the loop. This means this function is more suited for short-lived program executions when using async APIs is not feasible. For long-running applications, using event-driven APIs by leveraging timers is usually preferable.

await()

The await(PromiseInterface $promise, ?LoopInterface $loop = null, ?float $timeout = null): mixed function can be used to block waiting for the given $promise to be fulfilled.

$result = Clue\React\Block\await($promise);

This function will only return after the given $promise has settled, i.e. either fulfilled or rejected. In the meantime, the event loop will run any events attached to the same loop until the promise settles.

Once the promise is fulfilled, this function will return whatever the promise resolved to.

Once the promise is rejected, this will throw whatever the promise rejected with. If the promise did not reject with an Exception, then this function will throw an UnexpectedValueException instead.

try {
    $result = Clue\React\Block\await($promise);
    // promise successfully fulfilled with $result
    echo 'Result: ' . $result;
} catch (Exception $exception) {
    // promise rejected with $exception
    echo 'ERROR: ' . $exception->getMessage();
}

awaitAny()

The awaitAny(PromiseInterface[] $promises, ?LoopInterface $loop = null, ?float $timeout = null): mixed function can be used to wait for ANY of the given promises to be fulfilled.

$promises = array(
    $promise1,
    $promise2
);

$firstResult = Clue\React\Block\awaitAny($promises);

echo 'First result: ' . $firstResult;

awaitAll()

The awaitAll(PromiseInterface[] $promises, ?LoopInterface $loop = null, ?float $timeout = null): mixed[] function can be used to wait for ALL of the given promises to be fulfilled.

$promises = array(
    $promise1,
    $promise2
);

$allResults = Clue\React\Block\awaitAll($promises);

echo 'First promise resolved with: ' . $allResults[0];

Install

The recommended way to install this library is through Composer. New to Composer?

This project follows SemVer. This will install the latest supported version:

$ composer require clue/block-react:^1.5

See also the CHANGELOG for details about version upgrades.

This project aims to run on any platform and thus does not require any PHP extensions and supports running on legacy PHP 5.3 through current PHP 8+ and HHVM. It's highly recommended to use the latest supported PHP version for this project.

Tests

To run the test suite, you first need to clone this repo and then install all dependencies through Composer:

$ composer install

To run the test suite, go to the project root and run:

$ vendor/bin/phpunit

License

This project is released under the permissive MIT license.

Did you know that I offer custom development services and issuing invoices for sponsorships of releases and for contributions? Contact me (@clue) for details.

clue / block-react

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