58 lines
1.4 KiB
Go
58 lines
1.4 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/traefik/v2/pkg/middlewares"
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"github.com/containous/traefik/v2/pkg/tracing"
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"github.com/opentracing/opentracing-go/ext"
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)
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const (
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forwarderTypeName = "TracingForwarder"
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)
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type forwarderMiddleware struct {
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router string
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service string
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next http.Handler
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}
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// NewForwarder creates a new forwarder middleware that traces the outgoing request.
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func NewForwarder(ctx context.Context, router, service string, next http.Handler) http.Handler {
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middlewares.GetLogger(ctx, "tracing", forwarderTypeName).
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Debugf("Added outgoing tracing middleware %s", service)
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return &forwarderMiddleware{
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router: router,
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service: service,
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next: next,
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}
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}
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func (f *forwarderMiddleware) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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tr, err := tracing.FromContext(req.Context())
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if err != nil {
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f.next.ServeHTTP(rw, req)
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return
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}
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opParts := []string{f.service, f.router}
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span, req, finish := tr.StartSpanf(req, ext.SpanKindRPCClientEnum, "forward", opParts, "/")
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defer finish()
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span.SetTag("service.name", f.service)
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span.SetTag("router.name", f.router)
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ext.HTTPMethod.Set(span, req.Method)
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ext.HTTPUrl.Set(span, req.URL.String())
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span.SetTag("http.host", req.Host)
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tracing.InjectRequestHeaders(req)
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recorder := newStatusCodeRecoder(rw, 200)
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f.next.ServeHTTP(recorder, req)
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tracing.LogResponseCode(span, recorder.Status())
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}
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