mirror of
https://github.com/prometheus/prometheus.git
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78 lines
2.3 KiB
Go
78 lines
2.3 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 jaeger
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import (
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"github.com/opentracing/opentracing-go"
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)
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// ZipkinSpanFormat is an OpenTracing carrier format constant
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const ZipkinSpanFormat = "zipkin-span-format"
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// ExtractableZipkinSpan is a type of Carrier used for integration with Zipkin-aware
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// RPC frameworks (like TChannel). It does not support baggage, only trace IDs.
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type ExtractableZipkinSpan interface {
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TraceID() uint64
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SpanID() uint64
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ParentID() uint64
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Flags() byte
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}
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// InjectableZipkinSpan is a type of Carrier used for integration with Zipkin-aware
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// RPC frameworks (like TChannel). It does not support baggage, only trace IDs.
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type InjectableZipkinSpan interface {
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SetTraceID(traceID uint64)
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SetSpanID(spanID uint64)
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SetParentID(parentID uint64)
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SetFlags(flags byte)
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}
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type zipkinPropagator struct {
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tracer *Tracer
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}
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func (p *zipkinPropagator) Inject(
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ctx SpanContext,
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abstractCarrier interface{},
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) error {
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carrier, ok := abstractCarrier.(InjectableZipkinSpan)
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if !ok {
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return opentracing.ErrInvalidCarrier
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}
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carrier.SetTraceID(ctx.TraceID().Low) // TODO this cannot work with 128bit IDs
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carrier.SetSpanID(uint64(ctx.SpanID()))
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carrier.SetParentID(uint64(ctx.ParentID()))
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carrier.SetFlags(ctx.samplingState.flags())
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return nil
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}
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func (p *zipkinPropagator) Extract(abstractCarrier interface{}) (SpanContext, error) {
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carrier, ok := abstractCarrier.(ExtractableZipkinSpan)
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if !ok {
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return emptyContext, opentracing.ErrInvalidCarrier
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}
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if carrier.TraceID() == 0 {
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return emptyContext, opentracing.ErrSpanContextNotFound
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}
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var ctx SpanContext
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ctx.traceID.Low = carrier.TraceID()
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ctx.spanID = SpanID(carrier.SpanID())
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ctx.parentID = SpanID(carrier.ParentID())
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ctx.samplingState = &samplingState{}
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ctx.samplingState.setFlags(carrier.Flags())
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return ctx, nil
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}
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