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Eddy Filip
91
vendor/github.com/uber/jaeger-client-go/zipkin/README.md
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vendor/github.com/uber/jaeger-client-go/zipkin/README.md
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# Zipkin compatibility features
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## `NewZipkinB3HTTPHeaderPropagator()`
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Adds support for injecting and extracting Zipkin B3 Propagation HTTP headers,
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for use with other Zipkin collectors.
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```go
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// ...
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import (
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opentracing "github.com/opentracing/opentracing-go"
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jaeger "github.com/uber/jaeger-client-go"
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"github.com/uber/jaeger-client-go/zipkin"
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)
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func main() {
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// ...
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zipkinPropagator := zipkin.NewZipkinB3HTTPHeaderPropagator()
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injector := jaeger.TracerOptions.Injector(opentracing.HTTPHeaders, zipkinPropagator)
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extractor := jaeger.TracerOptions.Extractor(opentracing.HTTPHeaders, zipkinPropagator)
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// Zipkin shares span ID between client and server spans; it must be enabled via the following option.
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zipkinSharedRPCSpan := jaeger.TracerOptions.ZipkinSharedRPCSpan(true)
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// create Jaeger tracer
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tracer, closer := jaeger.NewTracer(
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"myService",
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mySampler, // as usual
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myReporter // as usual
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injector,
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extractor,
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zipkinSharedRPCSpan,
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)
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opentracing.SetGlobalTracer(tracer)
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// continue main()
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}
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```
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If you'd like to follow the official guides from https://godoc.org/github.com/uber/jaeger-client-go/config#example-Configuration-InitGlobalTracer-Production, here is an example.
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```go
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import (
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"time"
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opentracing "github.com/opentracing/opentracing-go"
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"github.com/uber/jaeger-client-go"
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jaegerClientConfig "github.com/uber/jaeger-client-go/config"
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"github.com/uber/jaeger-client-go/zipkin"
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"github.com/uber/jaeger-client-go/log"
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"github.com/uber/jaeger-lib/metrics"
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)
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func main(){
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//...
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// Recommended configuration for production.
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cfg := jaegercfg.Configuration{}
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// Example logger and metrics factory. Use github.com/uber/jaeger-client-go/log
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// and github.com/uber/jaeger-lib/metrics respectively to bind to real logging and metrics
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// frameworks.
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jLogger := jaegerlog.StdLogger
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jMetricsFactory := metrics.NullFactory
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// Zipkin shares span ID between client and server spans; it must be enabled via the following option.
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zipkinPropagator := zipkin.NewZipkinB3HTTPHeaderPropagator()
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// Create tracer and then initialize global tracer
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closer, err := cfg.InitGlobalTracer(
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serviceName,
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jaegercfg.Logger(jLogger),
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jaegercfg.Metrics(jMetricsFactory),
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jaegercfg.Injector(opentracing.HTTPHeaders, zipkinPropagator),
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jaegercfg.Extractor(opentracing.HTTPHeaders, zipkinPropagator),
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jaegercfg.ZipkinSharedRPCSpan(true),
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)
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if err != nil {
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log.Printf("Could not initialize jaeger tracer: %s", err.Error())
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return
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}
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defer closer.Close()
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// continue main()
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}
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```
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vendor/github.com/uber/jaeger-client-go/zipkin/doc.go
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vendor/github.com/uber/jaeger-client-go/zipkin/doc.go
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// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package zipkin comprises Zipkin functionality for Zipkin compatibility.
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package zipkin
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121
vendor/github.com/uber/jaeger-client-go/zipkin/propagation.go
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vendor/github.com/uber/jaeger-client-go/zipkin/propagation.go
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// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package zipkin
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import (
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"strconv"
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"strings"
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opentracing "github.com/opentracing/opentracing-go"
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"github.com/uber/jaeger-client-go"
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)
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// Option is a function that sets an option on Propagator
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type Option func(propagator *Propagator)
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// BaggagePrefix is a function that sets baggage prefix on Propagator
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func BaggagePrefix(prefix string) Option {
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return func(propagator *Propagator) {
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propagator.baggagePrefix = prefix
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}
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}
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// Propagator is an Injector and Extractor
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type Propagator struct {
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baggagePrefix string
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}
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// NewZipkinB3HTTPHeaderPropagator creates a Propagator for extracting and injecting
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// Zipkin HTTP B3 headers into SpanContexts. Baggage is by default enabled and uses prefix
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// 'baggage-'.
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func NewZipkinB3HTTPHeaderPropagator(opts ...Option) Propagator {
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p := Propagator{baggagePrefix: "baggage-"}
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for _, opt := range opts {
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opt(&p)
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}
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return p
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}
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// Inject conforms to the Injector interface for decoding Zipkin HTTP B3 headers
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func (p Propagator) Inject(
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sc jaeger.SpanContext,
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abstractCarrier interface{},
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) error {
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textMapWriter, ok := abstractCarrier.(opentracing.TextMapWriter)
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if !ok {
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return opentracing.ErrInvalidCarrier
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}
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textMapWriter.Set("x-b3-traceid", sc.TraceID().String())
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if sc.ParentID() != 0 {
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textMapWriter.Set("x-b3-parentspanid", strconv.FormatUint(uint64(sc.ParentID()), 16))
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}
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textMapWriter.Set("x-b3-spanid", strconv.FormatUint(uint64(sc.SpanID()), 16))
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if sc.IsSampled() {
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textMapWriter.Set("x-b3-sampled", "1")
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} else {
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textMapWriter.Set("x-b3-sampled", "0")
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}
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sc.ForeachBaggageItem(func(k, v string) bool {
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textMapWriter.Set(p.baggagePrefix+k, v)
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return true
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})
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return nil
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}
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// Extract conforms to the Extractor interface for encoding Zipkin HTTP B3 headers
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func (p Propagator) Extract(abstractCarrier interface{}) (jaeger.SpanContext, error) {
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textMapReader, ok := abstractCarrier.(opentracing.TextMapReader)
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if !ok {
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return jaeger.SpanContext{}, opentracing.ErrInvalidCarrier
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}
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var traceID jaeger.TraceID
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var spanID uint64
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var parentID uint64
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sampled := false
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var baggage map[string]string
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err := textMapReader.ForeachKey(func(rawKey, value string) error {
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key := strings.ToLower(rawKey) // TODO not necessary for plain TextMap
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var err error
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if key == "x-b3-traceid" {
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traceID, err = jaeger.TraceIDFromString(value)
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} else if key == "x-b3-parentspanid" {
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parentID, err = strconv.ParseUint(value, 16, 64)
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} else if key == "x-b3-spanid" {
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spanID, err = strconv.ParseUint(value, 16, 64)
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} else if key == "x-b3-sampled" && (value == "1" || value == "true") {
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sampled = true
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} else if strings.HasPrefix(key, p.baggagePrefix) {
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if baggage == nil {
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baggage = make(map[string]string)
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}
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baggage[key[len(p.baggagePrefix):]] = value
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}
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return err
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})
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if err != nil {
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return jaeger.SpanContext{}, err
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}
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if !traceID.IsValid() {
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return jaeger.SpanContext{}, opentracing.ErrSpanContextNotFound
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}
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return jaeger.NewSpanContext(
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traceID,
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jaeger.SpanID(spanID),
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jaeger.SpanID(parentID),
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sampled, baggage), nil
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}
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