37 lines
915 B
Go
37 lines
915 B
Go
// Package tracer provides an interface for distributed tracing
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package tracer
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import (
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"context"
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"github.com/unistack-org/micro/v3/metadata"
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)
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const (
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traceIDKey = "Micro-Trace-Id"
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spanIDKey = "Micro-Span-Id"
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)
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// FromContext returns a span from context
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func FromContext(ctx context.Context) (traceID string, parentSpanID string, isFound bool) {
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traceID, traceOk := metadata.Get(ctx, traceIDKey)
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microID, microOk := metadata.Get(ctx, "Micro-Id")
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if !traceOk && !microOk {
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isFound = false
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return
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}
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if !traceOk {
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traceID = microID
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}
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parentSpanID, ok := metadata.Get(ctx, spanIDKey)
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return traceID, parentSpanID, ok
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}
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// NewContext saves the trace and span ids in the context
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func NewContext(ctx context.Context, traceID, parentSpanID string) context.Context {
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md := metadata.New(2)
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md.Set(traceIDKey, traceID)
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md.Set(spanIDKey, parentSpanID)
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return metadata.MergeContext(ctx, md, true)
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}
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