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package basictracer
// SpanContext holds the basic Span metadata.
type SpanContext struct {
// A probabilistically unique identifier for a [multi-span] trace.
TraceID uint64
// 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
}
// 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
}
// Use positional parameters so the compiler will help catch new fields.
return SpanContext{c.TraceID, c.SpanID, c.Sampled, newBaggage}
}
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