traefik/middlewares/tracing/forwarder.go

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package tracing
import (
"fmt"
"net/http"
"github.com/containous/traefik/log"
"github.com/opentracing/opentracing-go/ext"
"github.com/urfave/negroni"
)
type forwarderMiddleware struct {
frontend string
backend string
opName string
*Tracing
}
// NewForwarderMiddleware creates a new forwarder middleware that traces the outgoing request
func (t *Tracing) NewForwarderMiddleware(frontend, backend string) negroni.Handler {
log.Debugf("Added outgoing tracing middleware %s", frontend)
return &forwarderMiddleware{
Tracing: t,
frontend: frontend,
backend: backend,
opName: fmt.Sprintf("forward %s/%s", frontend, backend),
}
}
func (f *forwarderMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
span, r, finish := StartSpan(r, f.opName, true)
defer finish()
span.SetTag("frontend.name", f.frontend)
span.SetTag("backend.name", f.backend)
ext.HTTPMethod.Set(span, r.Method)
ext.HTTPUrl.Set(span, r.URL.String())
span.SetTag("http.host", r.Host)
InjectRequestHeaders(r)
recorder := newStatusCodeRecoder(w, 200)
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next(recorder, r)
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LogResponseCode(span, recorder.Status())
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}