README

Composable pipeline pattern for processing data through ordered stages.

Requirements

PHP 8.2+

Installation

composer require philiprehberger/php-pipeline

Usage

Basic Pipeline

use PhilipRehberger\Pipeline\Pipeline;

$result = Pipeline::send('hello world')
    ->through([
        fn (string $value, \Closure $next) => $next(strtoupper($value)),
        fn (string $value, \Closure $next) => $next(str_replace(' ', '-', $value)),
    ])
    ->thenReturn();

// "HELLO-WORLD"

Class-Based Stages

Implement the Stage contract for reusable, testable stages:

use PhilipRehberger\Pipeline\Contracts\Stage;
use Closure;

class TrimStage implements Stage
{
    public function handle(mixed $passable, Closure $next): mixed
    {
        return $next(trim($passable));
    }
}

$result = Pipeline::send('  hello  ')
    ->pipe(TrimStage::class)
    ->thenReturn();

// "hello"

Conditional Stages

$isAdmin = true;

$result = Pipeline::send($data)
    ->pipe(ValidateStage::class)
    ->when($isAdmin, AdminEnrichStage::class)
    ->unless($isAdmin, GuestFilterStage::class)
    ->process();

Pipeline Context

Share state between stages using PipelineContext:

use PhilipRehberger\Pipeline\Pipeline;
use PhilipRehberger\Pipeline\PipelineContext;

$context = new PipelineContext();

$result = Pipeline::send($data)
    ->withContext($context)
    ->through([
        function (mixed $value, \Closure $next, PipelineContext $ctx) {
            $ctx->set('started_at', microtime(true));
            return $next($value);
        },
        function (mixed $value, \Closure $next, PipelineContext $ctx) {
            // Access values set by earlier stages
            $started = $ctx->get('started_at');
            return $next($value);
        },
    ])
    ->thenReturn();

// Read context after pipeline completes
$context->all();

Tap

Add side-effect stages that observe the payload without modifying it:

$result = Pipeline::send('hello')
    ->pipe(fn (string $value, \Closure $next) => $next(strtoupper($value)))
    ->tap(function (string $value) {
        logger()->info('After uppercase: ' . $value);
    })
    ->thenReturn();

// "HELLO" — tap does not change the payload

Validation Checkpoints

Insert validation steps between stages to abort the pipeline on invalid data:

$result = Pipeline::send(10)
    ->pipe(fn (mixed $value, \Closure $next) => $next($value * 2))
    ->checkpoint(fn (mixed $value) => $value <= 100)
    ->pipe(fn (mixed $value, \Closure $next) => $next($value + 1))
    ->process();

// 21

If the checkpoint returns false or throws, a CheckpointFailedException is thrown.

Stage Profiling

Profile stage execution time and memory usage:

use PhilipRehberger\Pipeline\Pipeline;

$result = Pipeline::send('hello')
    ->pipe(UpperCaseStage::class)
    ->pipe(AppendSuffixStage::class)
    ->processWithProfile();

$result->value();         // "HELLO_suffix"
$result->stages();        // [{name, duration_ms, memory_delta}, ...]
$result->totalDuration(); // Total ms across all stages
$result->slowestStage();  // Name of the slowest stage

Pipeline Templates

use PhilipRehberger\Pipeline\Pipeline;

Pipeline::register('text-cleanup', function (PendingPipeline $p) {
    $p->pipe(TrimStage::class)
      ->pipe(UpperCaseStage::class);
});

$result = Pipeline::fromTemplate('text-cleanup')
    ->send('  hello  ')
    ->thenReturn();

// "HELLO"

Typed Exception Handling

Catch specific exception types and recover gracefully:

$result = Pipeline::send($data)
    ->through([RiskyStage::class])
    ->catchException(ValidationException::class, function (\Throwable $e, mixed $passable) {
        return $passable; // Recover from validation errors only
    })
    ->thenReturn();

// Non-matching exceptions propagate normally

Error Handling

$result = Pipeline::send($data)
    ->through([RiskyStage::class])
    ->onFailure(function (\Throwable $e, mixed $passable) {
        return $passable; // Return original data on failure
    })
    ->process();

API

Method	Description
`Pipeline::send(mixed $passable)`	Create a new pipeline with the given data
`Pipeline::register(string $name, callable $builder)`	Register a reusable pipeline template
`Pipeline::fromTemplate(string $name)`	Create a pipeline from a registered template
`Pipeline::hasTemplate(string $name)`	Check if a template is registered
`->through(array $stages)`	Set the array of stages
`->pipe(string\|callable $stage)`	Append a single stage
`->when(bool $condition, string\|callable $stage)`	Add stage if condition is true
`->unless(bool $condition, string\|callable $stage)`	Add stage if condition is false
`->withContext(PipelineContext $context)`	Attach shared context passed to stages
`->tap(callable $fn)`	Add a side-effect stage that does not modify the payload
`->checkpoint(callable $validator)`	Insert a validation checkpoint between stages
`->profile()`	Enable profiling mode
`->catchException(string $class, callable $handler)`	Register a handler for a specific exception type
`->onFailure(callable $handler)`	Register a failure handler
`->process()`	Execute the pipeline and return the result
`->processWithProfile()`	Execute and return a `ProfiledResult` with timing data
`->thenReturn()`	Alias for `process()`

Development

composer install
vendor/bin/phpunit
vendor/bin/pint --test

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License

MIT

philiprehberger / php-pipeline

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