65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
package wire
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import (
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"github.com/openzipkin/zipkin-go-opentracing/flag"
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"github.com/openzipkin/zipkin-go-opentracing/types"
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)
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// ProtobufCarrier is a DelegatingCarrier that uses protocol buffers as the
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// the underlying datastructure. The reason for implementing DelagatingCarrier
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// is to allow for end users to serialize the underlying protocol buffers using
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// jsonpb or any other serialization forms they want.
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type ProtobufCarrier TracerState
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// SetState set's the tracer state.
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func (p *ProtobufCarrier) SetState(traceID types.TraceID, spanID uint64, parentSpanID *uint64, sampled bool, flags flag.Flags) {
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p.TraceId = traceID.Low
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p.TraceIdHigh = traceID.High
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p.SpanId = spanID
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if parentSpanID == nil {
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flags |= flag.IsRoot
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p.ParentSpanId = 0
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} else {
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flags &^= flag.IsRoot
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p.ParentSpanId = *parentSpanID
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}
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flags |= flag.SamplingSet
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if sampled {
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flags |= flag.Sampled
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p.Sampled = sampled
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} else {
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flags &^= flag.Sampled
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}
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p.Flags = uint64(flags)
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}
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// State returns the tracer state.
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func (p *ProtobufCarrier) State() (traceID types.TraceID, spanID uint64, parentSpanID *uint64, sampled bool, flags flag.Flags) {
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traceID.Low = p.TraceId
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traceID.High = p.TraceIdHigh
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spanID = p.SpanId
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sampled = p.Sampled
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flags = flag.Flags(p.Flags)
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if flags&flag.IsRoot == 0 {
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parentSpanID = &p.ParentSpanId
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}
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return traceID, spanID, parentSpanID, sampled, flags
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}
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// SetBaggageItem sets a baggage item.
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func (p *ProtobufCarrier) SetBaggageItem(key, value string) {
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if p.BaggageItems == nil {
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p.BaggageItems = map[string]string{key: value}
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return
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}
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p.BaggageItems[key] = value
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}
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// GetBaggage iterates over each baggage item and executes the callback with
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// the key:value pair.
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func (p *ProtobufCarrier) GetBaggage(f func(k, v string)) {
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for k, v := range p.BaggageItems {
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f(k, v)
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}
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}
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