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| 1 | +<?php |
| 2 | + |
| 3 | +declare(strict_types=1); |
| 4 | + |
| 5 | +namespace Overtrue\LaravelOpenTelemetry\Hooks\Illuminate\Contracts\Http; |
| 6 | + |
| 7 | +use Illuminate\Contracts\Http\Kernel as KernelContract; |
| 8 | +use OpenTelemetry\Contrib\Instrumentation\Laravel\Hooks\LaravelHook; |
| 9 | +use OpenTelemetry\Contrib\Instrumentation\Laravel\Hooks\LaravelHookTrait; |
| 10 | +use OpenTelemetry\Contrib\Instrumentation\Laravel\Hooks\PostHookTrait; |
| 11 | +use Overtrue\LaravelOpenTelemetry\Facades\Measure; |
| 12 | +use Symfony\Component\HttpFoundation\Response; |
| 13 | + |
| 14 | +use function OpenTelemetry\Instrumentation\hook; |
| 15 | + |
| 16 | +class Kernel implements LaravelHook |
| 17 | +{ |
| 18 | + use LaravelHookTrait; |
| 19 | + use PostHookTrait; |
| 20 | + |
| 21 | + public function instrument(): void |
| 22 | + { |
| 23 | + // Hook into the handle method to add trace ID to response |
| 24 | + hook( |
| 25 | + class: KernelContract::class, |
| 26 | + function: 'handle', |
| 27 | + post: function (KernelContract $kernel, array $params, ?Response $response, ?\Throwable $exception) { |
| 28 | + if ($response) { |
| 29 | + $this->addTraceIdToResponse($response); |
| 30 | + } |
| 31 | + }); |
| 32 | + } |
| 33 | + |
| 34 | + /** |
| 35 | + * Add trace ID to response headers |
| 36 | + */ |
| 37 | + private function addTraceIdToResponse(Response $response): void |
| 38 | + { |
| 39 | + $headerName = config('otel.response_trace_header_name'); |
| 40 | + |
| 41 | + // Skip if header name is not configured or empty |
| 42 | + if (empty($headerName)) { |
| 43 | + return; |
| 44 | + } |
| 45 | + |
| 46 | + try { |
| 47 | + // Get current trace ID |
| 48 | + $traceId = Measure::traceId(); |
| 49 | + |
| 50 | + // Add trace ID to response header if it's valid (not empty and not all zeros) |
| 51 | + if (! empty($traceId) && $traceId !== '00000000000000000000000000000000') { |
| 52 | + $response->headers->set($headerName, $traceId); |
| 53 | + } |
| 54 | + } catch (\Throwable $e) { |
| 55 | + // Silently ignore errors when getting trace ID |
| 56 | + // This prevents failures when there's no trace context |
| 57 | + } |
| 58 | + } |
| 59 | +} |
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