99 lines
3.4 KiB
Go
99 lines
3.4 KiB
Go
package observability
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import (
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"context"
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"fmt"
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"net/http"
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"strconv"
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"strings"
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"time"
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"github.com/containous/alice"
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"github.com/traefik/traefik/v3/pkg/metrics"
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"github.com/traefik/traefik/v3/pkg/middlewares"
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"github.com/traefik/traefik/v3/pkg/tracing"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/metric"
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semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
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"go.opentelemetry.io/otel/trace"
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"go.opentelemetry.io/otel/trace/noop"
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)
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const (
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entryPointTypeName = "TracingEntryPoint"
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)
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type entryPointTracing struct {
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tracer *tracing.Tracer
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entryPoint string
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next http.Handler
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semConvMetricRegistry *metrics.SemConvMetricsRegistry
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}
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// WrapEntryPointHandler Wraps tracing to alice.Constructor.
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func WrapEntryPointHandler(ctx context.Context, tracer *tracing.Tracer, semConvMetricRegistry *metrics.SemConvMetricsRegistry, entryPointName string) alice.Constructor {
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return func(next http.Handler) (http.Handler, error) {
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if tracer == nil {
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tracer = tracing.NewTracer(noop.Tracer{}, nil, nil)
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}
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return newEntryPoint(ctx, tracer, semConvMetricRegistry, entryPointName, next), nil
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}
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}
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// newEntryPoint creates a new tracing middleware for incoming requests.
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func newEntryPoint(ctx context.Context, tracer *tracing.Tracer, semConvMetricRegistry *metrics.SemConvMetricsRegistry, entryPointName string, next http.Handler) http.Handler {
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middlewares.GetLogger(ctx, "tracing", entryPointTypeName).Debug().Msg("Creating middleware")
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if tracer == nil {
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tracer = tracing.NewTracer(noop.Tracer{}, nil, nil)
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}
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return &entryPointTracing{
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entryPoint: entryPointName,
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tracer: tracer,
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semConvMetricRegistry: semConvMetricRegistry,
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next: next,
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}
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}
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func (e *entryPointTracing) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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tracingCtx := tracing.ExtractCarrierIntoContext(req.Context(), req.Header)
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start := time.Now()
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tracingCtx, span := e.tracer.Start(tracingCtx, "EntryPoint", trace.WithSpanKind(trace.SpanKindServer), trace.WithTimestamp(start))
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req = req.WithContext(tracingCtx)
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span.SetAttributes(attribute.String("entry_point", e.entryPoint))
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e.tracer.CaptureServerRequest(span, req)
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recorder := newStatusCodeRecorder(rw, http.StatusOK)
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e.next.ServeHTTP(recorder, req)
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e.tracer.CaptureResponse(span, recorder.Header(), recorder.Status(), trace.SpanKindServer)
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end := time.Now()
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span.End(trace.WithTimestamp(end))
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if e.semConvMetricRegistry != nil && e.semConvMetricRegistry.HTTPServerRequestDuration() != nil {
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var attrs []attribute.KeyValue
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if recorder.Status() < 100 || recorder.Status() >= 600 {
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attrs = append(attrs, attribute.Key("error.type").String(fmt.Sprintf("Invalid HTTP status code ; %d", recorder.Status())))
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} else if recorder.Status() >= 400 {
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attrs = append(attrs, attribute.Key("error.type").String(strconv.Itoa(recorder.Status())))
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}
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attrs = append(attrs, semconv.HTTPRequestMethodKey.String(req.Method))
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attrs = append(attrs, semconv.HTTPResponseStatusCode(recorder.Status()))
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attrs = append(attrs, semconv.NetworkProtocolName(strings.ToLower(req.Proto)))
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attrs = append(attrs, semconv.NetworkProtocolVersion(Proto(req.Proto)))
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attrs = append(attrs, semconv.ServerAddress(req.Host))
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attrs = append(attrs, semconv.URLScheme(req.Header.Get("X-Forwarded-Proto")))
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e.semConvMetricRegistry.HTTPServerRequestDuration().Record(req.Context(), end.Sub(start).Seconds(), metric.WithAttributes(attrs...))
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}
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}
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