96 lines
2.9 KiB
Go
96 lines
2.9 KiB
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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// Propagator is an Injector and Extractor
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type Propagator struct{}
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// NewZipkinB3HTTPHeaderPropagator creates a Propagator for extracting and injecting
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// Zipkin HTTP B3 headers into SpanContexts.
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func NewZipkinB3HTTPHeaderPropagator() Propagator {
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return Propagator{}
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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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// TODO this needs to change to support 128bit IDs
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textMapWriter.Set("x-b3-traceid", strconv.FormatUint(sc.TraceID().Low, 16))
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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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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 uint64
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var spanID uint64
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var parentID uint64
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sampled := false
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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 = strconv.ParseUint(value, 16, 64)
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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" {
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sampled = true
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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 == 0 {
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return jaeger.SpanContext{}, opentracing.ErrSpanContextNotFound
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}
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return jaeger.NewSpanContext(
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jaeger.TraceID{Low: traceID},
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jaeger.SpanID(spanID),
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jaeger.SpanID(parentID),
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sampled, nil), nil
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}
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