43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
package instana
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// SpanContext holds the basic Span metadata.
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type SpanContext struct {
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// A probabilistically unique identifier for a [multi-span] trace.
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TraceID int64
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// A probabilistically unique identifier for a span.
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SpanID int64
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// Whether the trace is sampled.
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Sampled bool
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// The span's associated baggage.
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Baggage map[string]string // initialized on first use
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}
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// ForeachBaggageItem belongs to the opentracing.SpanContext interface
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func (c SpanContext) ForeachBaggageItem(handler func(k, v string) bool) {
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for k, v := range c.Baggage {
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if !handler(k, v) {
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break
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}
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}
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}
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// WithBaggageItem returns an entirely new SpanContext with the
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// given key:value baggage pair set.
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func (c SpanContext) WithBaggageItem(key, val string) SpanContext {
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var newBaggage map[string]string
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if c.Baggage == nil {
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newBaggage = map[string]string{key: val}
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} else {
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newBaggage = make(map[string]string, len(c.Baggage)+1)
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for k, v := range c.Baggage {
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newBaggage[k] = v
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}
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newBaggage[key] = val
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}
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// Use positional parameters so the compiler will help catch new fields.
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return SpanContext{c.TraceID, c.SpanID, c.Sampled, newBaggage}
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}
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