1 files changed, 0 insertions, 84 deletions
diff --git a/middleware/trace/trace.go b/middleware/trace/trace.go
deleted file mode 100644
index 86561871a..000000000
--- a/middleware/trace/trace.go
+++ /dev/null
@@ -1,84 +0,0 @@
-// Package trace implements OpenTracing-based tracing
-package trace
-
-import (
-	"fmt"
-	"sync"
-	"sync/atomic"
-
-	"github.com/coredns/coredns/middleware"
-	// Plugin the trace package.
-	_ "github.com/coredns/coredns/middleware/pkg/trace"
-
-	"github.com/miekg/dns"
-	ot "github.com/opentracing/opentracing-go"
-	zipkin "github.com/openzipkin/zipkin-go-opentracing"
-	"golang.org/x/net/context"
-)
-
-type trace struct {
-	Next            middleware.Handler
-	ServiceEndpoint string
-	Endpoint        string
-	EndpointType    string
-	tracer          ot.Tracer
-	serviceName     string
-	clientServer    bool
-	every           uint64
-	count           uint64
-	Once            sync.Once
-}
-
-func (t *trace) Tracer() ot.Tracer {
-	return t.tracer
-}
-
-// OnStartup sets up the tracer
-func (t *trace) OnStartup() error {
-	var err error
-	t.Once.Do(func() {
-		switch t.EndpointType {
-		case "zipkin":
-			err = t.setupZipkin()
-		default:
-			err = fmt.Errorf("unknown endpoint type: %s", t.EndpointType)
-		}
-	})
-	return err
-}
-
-func (t *trace) setupZipkin() error {
-
-	collector, err := zipkin.NewHTTPCollector(t.Endpoint)
-	if err != nil {
-		return err
-	}
-
-	recorder := zipkin.NewRecorder(collector, false, t.ServiceEndpoint, t.serviceName)
-	t.tracer, err = zipkin.NewTracer(recorder, zipkin.ClientServerSameSpan(t.clientServer))
-
-	return err
-}
-
-// Name implements the Handler interface.
-func (t *trace) Name() string {
-	return "trace"
-}
-
-// ServeDNS implements the middleware.Handle interface.
-func (t *trace) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
-	trace := false
-	if t.every > 0 {
-		queryNr := atomic.AddUint64(&t.count, 1)
-
-		if queryNr%t.every == 0 {
-			trace = true
-		}
-	}
-	if span := ot.SpanFromContext(ctx); span == nil && trace {
-		span := t.Tracer().StartSpan("servedns")
-		defer span.Finish()
-		ctx = ot.ContextWithSpan(ctx, span)
-	}
-	return middleware.NextOrFailure(t.Name(), t.Next, ctx, w, r)
-}