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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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
}
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