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zipkin.go
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zipkin.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package jaeger
import (
"github.com/opentracing/opentracing-go"
)
// ZipkinSpanFormat is an OpenTracing carrier format constant
const ZipkinSpanFormat = "zipkin-span-format"
// ExtractableZipkinSpan is a type of Carrier used for integration with Zipkin-aware
// RPC frameworks (like TChannel). It does not support baggage, only trace IDs.
type ExtractableZipkinSpan interface {
TraceID() uint64
SpanID() uint64
ParentID() uint64
Flags() byte
}
// InjectableZipkinSpan is a type of Carrier used for integration with Zipkin-aware
// RPC frameworks (like TChannel). It does not support baggage, only trace IDs.
type InjectableZipkinSpan interface {
SetTraceID(traceID uint64)
SetSpanID(spanID uint64)
SetParentID(parentID uint64)
SetFlags(flags byte)
}
type zipkinPropagator struct {
tracer *tracer
}
func (p *zipkinPropagator) Inject(
ctx SpanContext,
abstractCarrier interface{},
) error {
carrier, ok := abstractCarrier.(InjectableZipkinSpan)
if !ok {
return opentracing.ErrInvalidCarrier
}
carrier.SetTraceID(ctx.TraceID().Low) // TODO this cannot work with 128bit IDs
carrier.SetSpanID(uint64(ctx.SpanID()))
carrier.SetParentID(uint64(ctx.ParentID()))
carrier.SetFlags(ctx.flags)
return nil
}
func (p *zipkinPropagator) Extract(abstractCarrier interface{}) (SpanContext, error) {
carrier, ok := abstractCarrier.(ExtractableZipkinSpan)
if !ok {
return emptyContext, opentracing.ErrInvalidCarrier
}
if carrier.TraceID() == 0 {
return emptyContext, opentracing.ErrSpanContextNotFound
}
var ctx SpanContext
ctx.traceID.Low = carrier.TraceID()
ctx.spanID = SpanID(carrier.SpanID())
ctx.parentID = SpanID(carrier.ParentID())
ctx.flags = carrier.Flags()
return ctx, nil
}