leocavalcante / swoole-futures
Futures + async/await for PHP's Swoole concurrency run-time.
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Requires
- php: >=7.4
Requires (Dev)
- phpunit/phpunit: ^9.0
- swoole/ide-helper: ^4.4
- vimeo/psalm: ^3.9
This package is auto-updated.
Last update: 2024-10-09 04:47:33 UTC
README
⏳ Futures, Streams & Async/Await for PHP's Swoole asynchronous run-time.
Inspired by futures Crate for Rust's Tokio asynchronous run-time.
It's on top of Swoole's coroutines system there is no special wizardry, just sugar.
Install
composer require leocavalcante/swoole-futures
Usage
Async / await
Creates and awaits for asynchronous computations in an alternative style than Swoole's coroutines.
$future = Futures\async(fn() => 1); $result = $future->await(); // 1
Futures are lazy, it only runs when you call await
.
Join
Joins a list of Futures into a single Future that awaits for a list of results.
$slow_rand = function (): int { Co::sleep(3); return rand(1, 100); }; $n1 = Futures\async($slow_rand); $n2 = Futures\async($slow_rand); $n3 = Futures\async($slow_rand); $n = Futures\join([$n1, $n2, $n3]); print_r($n->await());
This takes 3 seconds, not 9, Futures runs concurrently! (Order isn't guaranteed)
Race
Returns the result of the first finished Future.
use Swoole\Coroutine\Http\Client; $site1 = Futures\async(function() { $client = new Client('www.google.com', 443, true); $client->get('/'); return $client->body; }); $site2 = Futures\async(function() { $client = new Client('www.swoole.co.uk', 443, true); $client->get('/'); return $client->body; }); $site3 = Futures\async(function() { $client = new Client('leocavalcante.dev', 443, true); $client->get('/'); return $client->body; }); $first_to_load = Futures\race([$site1, $site2, $site3]); echo $first_to_load;
And there is a Futures\select
alias.
Async map
Maps an array into a list of Futures where which item runs concurrently.
$list = [1, 2, 3]; $multiply = fn(int $a) => fn(int $b) => $a * $b; $double = $multiply(2); $doubles = Futures\join(Futures\async_map($list, $double))->await(); print_r($doubles);
Then
Sequences a series of steps for a Future, is the serial analog for join
:
use function Futures\async; $future = async(fn() => 2) ->then(fn(int $i) => async(fn() => $i + 3)) ->then(fn(int $i) => async(fn() => $i * 4)) ->then(fn(int $i) => async(fn() => $i - 5)); echo $future->await(); // 15
Stream
Streams values/events from sink
to listen
with between operations.
$stream = Futures\stream() ->map(fn($val) => $val + 1) ->filter(fn($val) => $val % 2 === 0) ->map(fn($val) => $val * 2) ->listen(fn($val) => print("$val\n")); // 4 8 12 16 20 foreach (range(0, 9) as $n) { $stream->sink($n); }
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