package zipkintracer import ( "github.com/openzipkin/zipkin-go-opentracing/flag" "github.com/openzipkin/zipkin-go-opentracing/types" ) // SpanContext holds the basic Span metadata. type SpanContext struct { // A probabilistically unique identifier for a [multi-span] trace. TraceID types.TraceID // A probabilistically unique identifier for a span. SpanID uint64 // Whether the trace is sampled. Sampled bool // The span's associated baggage. Baggage map[string]string // initialized on first use // The SpanID of this Context's parent, or nil if there is no parent. ParentSpanID *uint64 // Flags provides the ability to create and communicate feature flags. Flags flag.Flags // Whether the span is owned by the current process Owner bool } // ForeachBaggageItem belongs to the opentracing.SpanContext interface func (c SpanContext) ForeachBaggageItem(handler func(k, v string) bool) { for k, v := range c.Baggage { if !handler(k, v) { break } } } // WithBaggageItem returns an entirely new basictracer SpanContext with the // given key:value baggage pair set. func (c SpanContext) WithBaggageItem(key, val string) SpanContext { var newBaggage map[string]string if c.Baggage == nil { newBaggage = map[string]string{key: val} } else { newBaggage = make(map[string]string, len(c.Baggage)+1) for k, v := range c.Baggage { newBaggage[k] = v } newBaggage[key] = val } var parentSpanID *uint64 if c.ParentSpanID != nil { parentSpanID = new(uint64) *parentSpanID = *c.ParentSpanID } // Use positional parameters so the compiler will help catch new fields. return SpanContext{c.TraceID, c.SpanID, c.Sampled, newBaggage, parentSpanID, c.Flags, c.Owner} }