Update tracing dependencies

vendor/github.com/uber/jaeger-client-go/tracer.go

@@ -17,6 +17,7 @@ package jaeger
 import (
 	"fmt"
 	"io"
+	"math/rand"
 	"os"
 	"reflect"
 	"strconv"
@@ -96,13 +97,13 @@ func NewTracer(
 	}
 
 	// register default injectors/extractors unless they are already provided via options
-	textPropagator := newTextMapPropagator(getDefaultHeadersConfig(), t.metrics)
+	textPropagator := NewTextMapPropagator(getDefaultHeadersConfig(), t.metrics)
 	t.addCodec(opentracing.TextMap, textPropagator, textPropagator)
 
-	httpHeaderPropagator := newHTTPHeaderPropagator(getDefaultHeadersConfig(), t.metrics)
+	httpHeaderPropagator := NewHTTPHeaderPropagator(getDefaultHeadersConfig(), t.metrics)
 	t.addCodec(opentracing.HTTPHeaders, httpHeaderPropagator, httpHeaderPropagator)
 
-	binaryPropagator := newBinaryPropagator(t)
+	binaryPropagator := NewBinaryPropagator(t)
 	t.addCodec(opentracing.Binary, binaryPropagator, binaryPropagator)
 
 	// TODO remove after TChannel supports OpenTracing
@@ -122,9 +123,18 @@ func NewTracer(
 	}
 
 	if t.randomNumber == nil {
-		rng := utils.NewRand(time.Now().UnixNano())
+		seedGenerator := utils.NewRand(time.Now().UnixNano())
+		pool := sync.Pool{
+			New: func() interface{} {
+				return rand.NewSource(seedGenerator.Int63())
+			},
+		}
+
 		t.randomNumber = func() uint64 {
-			return uint64(rng.Int63())
+			generator := pool.Get().(rand.Source)
+			number := uint64(generator.Int63())
+			pool.Put(generator)
+			return number
 		}
 	}
 	if t.timeNow == nil {
@@ -309,7 +319,11 @@ func (t *Tracer) Extract(
 	carrier interface{},
 ) (opentracing.SpanContext, error) {
 	if extractor, ok := t.extractors[format]; ok {
-		return extractor.Extract(carrier)
+		spanCtx, err := extractor.Extract(carrier)
+		if err != nil {
+			return nil, err // ensure returned spanCtx is nil
+		}
+		return spanCtx, nil
 	}
 	return nil, opentracing.ErrUnsupportedFormat
 }