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<?php declare(strict_types=1); |
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namespace ReactInspector\Http\Middleware\Printer; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use React\Cache\ArrayCache; |
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use React\Cache\CacheInterface; |
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use React\Promise\PromiseInterface; |
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use ReactInspector\Metric; |
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use ReactInspector\MetricsStreamInterface; |
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use ReactInspector\Printer\Printer; |
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use RingCentral\Psr7\Response; |
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use function assert; |
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final class PrinterMiddleware |
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{ |
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private const TTL = 120; |
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private Printer $printer; |
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private CacheInterface $metrics; |
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/** @var array<string, string> */ |
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private array $metricsList = []; |
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public function __construct(Printer $printer, MetricsStreamInterface $metricsStream) |
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{ |
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$this->printer = $printer; |
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$this->metrics = new ArrayCache(); |
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$metricsStream->subscribe(function (Metric $metric): void { |
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$this->metrics->set($metric->config()->name(), $metric, self::TTL); |
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$this->metricsList[$metric->config()->name()] = $metric->config()->name(); |
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}); |
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} |
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public function __invoke(ServerRequestInterface $request): PromiseInterface |
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{ |
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/** @psalm-suppress TooManyTemplateParams */ |
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return $this->metrics->getMultiple($this->metricsList)->then(function (array $metrics): ResponseInterface { |
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$body = ''; |
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foreach ($metrics as $metric) { |
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assert($metric instanceof Metric); |
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$body .= $this->printer->print($metric); |
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} |
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return new Response(200, [], $body); |
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}); |
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} |
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} |
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reactphp-inspector /
http-middleware-printer
