gousto / replay
Replay comes in allowing you to plan re-tries and fallbacks strategies for your functions.
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Requires (Dev)
- codeception/codeception: ^2.3
This package is not auto-updated.
Last update: 2024-11-05 18:18:50 UTC
README
Re-play functions that error out!
Some times things not always works at the first attempt. Replay comes in allowing you to plan re-tries and fallbacks strategies for your functions.
Install
composer require gousto/replay
Features
- Re-try functions within exception scope
- Increase delay for every attempt
- Create advanced re-try fallback strategies
Usage
If you want to replay a function when it throws an Exception here is an example:
<?php use Gousto\Replay\Replay; try { $result = Replay::retry(3, function() { return Http::get('example.com'); }, 50); Log::info("All good"); } catch(\Gousto\Replay\RetryLogicException $e) { \Log::error("After 3 times the function still error out!"); }
This code will return you right away the result of Http::get()
, if no Exception is occured.
In case of Exception it will retry again up to 3 times with a 50ms
interval.
Increase delay at every attempt:
Let's say we want to have a re-try strategy that want to increase the interval at every attempt
i.e
: 1st attempt 10ms
, 2nd attempts 20ms
3rd attempt 40ms
<?php use Gousto\Replay\Replay; $replay = Replay::times(3, function() { throw new LogicException(); }, 10); $replay->onRetry(function(Exception $e, Replay $replay) { $replay->setDelay($replay->getDelay() * 2); }); // play the strategy! $replay->play();
Custom Exceptions
Replay allow you to trigger the retry logic only for particular Exceptions, pass an array of Exceptions class names as 4th paramter:
<?php use Gousto\Replay\Replay; // Will throw LogicException and not retry Replay::retry(3, function() { throw new LogicException(); }, 0, [RuntimeException::class]);
This will throw a LogicException
when the function is invoked.
We are going to retry only when the RuntimeException
is thrown.
API
- retry($attempts = 1, Closure $user_function, $delay = 0, $exception_targets = [Exception::class])
Return the result of the Closure if no exception is occured. Alternatevely it retries invoking the
function until the number of attempts specified. Throw Gousto\Replay\RetryLogicException::class
if the number
of attempts remained is 0.
$attempts
: int, number of attempts the function might be replayed$user_function:
Closure, function which will be replayed if errored$delay:
int, delay is measured in milliseconds$exception_targets:
array, list of exceptions which will be considered as errors
use Gousto\Replay\Replay; Replay::retry(1, function() { throw new Exception(); }, 0, [Exception::class]);
- times($attempts = 1, Closure $user_function, $delay = 0, $exception_targets = [])
Helper function for instantiate Replay, facilitate chaining
$attempts
: int, number of attempts the function might be replayed$user_function:
Closure, function which will be replayed if errored$delay:
int, delay is measured in milliseconds$exception_targets:
array, list of exceptions which will be considered as errors
use Gousto\Replay\Replay; $replay = Replay::times(1, function() { throw new Exception(); }, 0, [Exception::class]); $replay->play();
play($silent = false):
Tell replay to invoke the function and use the retry logic if needed.
$silent:
bool, if true will not throwRetryLogicException
but will return it.
use Gousto\Replay\Replay; $replay = Replay::times(2, function() { throw new Exception(); }, 0, [Exception::class]); $result = $replay->play(true); // $result instanceof RetryLogicException $replay->play(); // throw RetryLogicException
onRetry(Closure $handler):
Hook a function that will be trigger for every attempt, this is useful for logging or any other action.
use Gousto\Replay\Replay; $counter = 0; $replay = Replay::times(3, function() use (&$counter) { $counter++; if ($counter === 3) { return $counter; } throw new Exception("Error"); }); // WILL LOG: // Attempt 1: Failed // Attempt 2: Failed $replay->onRetry(function(Exception $exception, Replay $replay) { Log::error("Attempt {$replay->attempts()}: Failed"); }); try { $replay->play(); } catch(\Gousto\Replay\RetryLogicException $e) { }
next():
The next function allow you to manually control the retry cycle
use Gousto\Replay\Replay; $replay = Replay::times(3, function() { throw new Exception(); }, 0, [Exception::class]); $replay->next(); // 1 attempt $replay->next(); // 2 attempts $replay->next(); // Throw RetryLogicException
attempts():
Return the number of retry attempts
use Gousto\Replay\Replay; $replay = Replay::times(3, function() { throw new Exception(); }, 0, [Exception::class]); $replay->next(); $replay->attempts(); // 1 $replay->next(); $replay->attempts(); // 2
isErrored():
Return the state of the function invokation
$replay = Replay::times(4, function() { return 10; }, 0, [Exception::class]); $result = $replay->play(); // 10 $replay->isErrored(); // False