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Prince Pereirac1c21d62021-04-22 08:38:15 +00001// Copyright (c) 2017 Uber Technologies, Inc.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package jaeger
16
17import (
18 "github.com/opentracing/opentracing-go"
19)
20
21// ZipkinSpanFormat is an OpenTracing carrier format constant
22const ZipkinSpanFormat = "zipkin-span-format"
23
24// ExtractableZipkinSpan is a type of Carrier used for integration with Zipkin-aware
25// RPC frameworks (like TChannel). It does not support baggage, only trace IDs.
26type ExtractableZipkinSpan interface {
27 TraceID() uint64
28 SpanID() uint64
29 ParentID() uint64
30 Flags() byte
31}
32
33// InjectableZipkinSpan is a type of Carrier used for integration with Zipkin-aware
34// RPC frameworks (like TChannel). It does not support baggage, only trace IDs.
35type InjectableZipkinSpan interface {
36 SetTraceID(traceID uint64)
37 SetSpanID(spanID uint64)
38 SetParentID(parentID uint64)
39 SetFlags(flags byte)
40}
41
42type zipkinPropagator struct {
43 tracer *Tracer
44}
45
46func (p *zipkinPropagator) Inject(
47 ctx SpanContext,
48 abstractCarrier interface{},
49) error {
50 carrier, ok := abstractCarrier.(InjectableZipkinSpan)
51 if !ok {
52 return opentracing.ErrInvalidCarrier
53 }
54
55 carrier.SetTraceID(ctx.TraceID().Low) // TODO this cannot work with 128bit IDs
56 carrier.SetSpanID(uint64(ctx.SpanID()))
57 carrier.SetParentID(uint64(ctx.ParentID()))
58 carrier.SetFlags(ctx.samplingState.flags())
59 return nil
60}
61
62func (p *zipkinPropagator) Extract(abstractCarrier interface{}) (SpanContext, error) {
63 carrier, ok := abstractCarrier.(ExtractableZipkinSpan)
64 if !ok {
65 return emptyContext, opentracing.ErrInvalidCarrier
66 }
67 if carrier.TraceID() == 0 {
68 return emptyContext, opentracing.ErrSpanContextNotFound
69 }
70 var ctx SpanContext
71 ctx.traceID.Low = carrier.TraceID()
72 ctx.spanID = SpanID(carrier.SpanID())
73 ctx.parentID = SpanID(carrier.ParentID())
74 ctx.samplingState = &samplingState{}
75 ctx.samplingState.setFlags(carrier.Flags())
76 return ctx, nil
77}