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<?php declare(strict_types=1); |
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namespace WyriHaximus\React\Http\Middleware; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Rx\ObservableInterface; |
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use WyriHaximus\React\Inspector\CollectorInterface; |
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use WyriHaximus\React\Inspector\Metric; |
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use function ApiClients\Tools\Rx\observableFromArray; |
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use function React\Promise\resolve; |
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final class MeasureMiddleware implements CollectorInterface |
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{ |
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private const DEFAULT_PREFIX = ''; |
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/** @var string */ |
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private $prefix = self::DEFAULT_PREFIX; |
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/** @var int */ |
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private $current = 0; |
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/** @var int */ |
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private $total = 0; |
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/** @var null|float */ |
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private $tookMin = null; |
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/** @var float */ |
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private $tookMax = 0.0; |
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/** @var float */ |
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private $tookAvg = 0.0; |
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/** @var float */ |
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private $tookTotal = 0.0; |
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public function __construct(string $prefix = self::DEFAULT_PREFIX) |
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{ |
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$this->prefix = $prefix; |
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} |
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public function __invoke(ServerRequestInterface $request, callable $next) |
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{ |
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$this->current++; |
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$start = microtime(true); |
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return resolve($next($request))->always(function () use ($start) { |
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$took = microtime(true) - $start; |
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$this->current--; |
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$this->total++; |
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$this->tookTotal += $took; |
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if ($this->tookMin === null || $took < $this->tookMin) { |
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$this->tookMin = $took; |
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} |
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if ($this->tookMax < $took) { |
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$this->tookMax = $took; |
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} |
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$this->tookAvg = $this->tookTotal / $this->total; |
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}); |
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} |
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public function collect(): ObservableInterface |
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{ |
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$metrics = [ |
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new Metric($this->prefix . 'current', $this->current), |
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new Metric($this->prefix . 'total', $this->total), |
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new Metric($this->prefix . 'took.min', $this->tookMin === null ? 0.0 : $this->tookMin), |
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new Metric($this->prefix . 'took.max', $this->tookMax), |
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new Metric($this->prefix . 'took.average', $this->tookAvg), |
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new Metric($this->prefix . 'took.total', $this->tookTotal), |
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]; |
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$this->total = 0; |
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$this->tookMin = null; |
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$this->tookMax = 0.0; |
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$this->tookAvg = 0.0; |
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$this->tookTotal = 0; |
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return observableFromArray($metrics); |
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} |
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public function cancel(): void |
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{ |
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// Does not apply to this class |
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} |
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} |
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WyriHaximus /
reactphp-http-middleware-measure
This check looks for assignments to scalar types that may be of the wrong type.
To ensure the code behaves as expected, it may be a good idea to add an explicit type cast.