62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
package tracing
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import (
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"context"
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"net/http"
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"github.com/containous/alice"
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"github.com/opentracing/opentracing-go"
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"github.com/opentracing/opentracing-go/ext"
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"github.com/traefik/traefik/v2/pkg/middlewares"
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"github.com/traefik/traefik/v2/pkg/tracing"
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)
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const (
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entryPointTypeName = "TracingEntryPoint"
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)
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// NewEntryPoint creates a new middleware that the incoming request.
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func NewEntryPoint(ctx context.Context, t *tracing.Tracing, entryPointName string, next http.Handler) http.Handler {
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middlewares.GetLogger(ctx, "tracing", entryPointTypeName).Debug().Msg("Creating middleware")
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return &entryPointMiddleware{
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entryPoint: entryPointName,
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Tracing: t,
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next: next,
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}
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}
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type entryPointMiddleware struct {
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*tracing.Tracing
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entryPoint string
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next http.Handler
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}
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func (e *entryPointMiddleware) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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spanCtx, err := e.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(req.Header))
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if err != nil {
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middlewares.GetLogger(req.Context(), "tracing", entryPointTypeName).
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Debug().Err(err).Msg("Failed to extract the context")
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}
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span, req, finish := e.StartSpanf(req, ext.SpanKindRPCServerEnum, "EntryPoint", []string{e.entryPoint, req.Host}, " ", ext.RPCServerOption(spanCtx))
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defer finish()
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ext.Component.Set(span, e.ServiceName)
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tracing.LogRequest(span, req)
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req = req.WithContext(tracing.WithTracing(req.Context(), e.Tracing))
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recorder := newStatusCodeRecorder(rw, http.StatusOK)
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e.next.ServeHTTP(recorder, req)
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tracing.LogResponseCode(span, recorder.Status())
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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.Tracing, entryPointName string) alice.Constructor {
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return func(next http.Handler) (http.Handler, error) {
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return NewEntryPoint(ctx, tracer, entryPointName, next), nil
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}
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}
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