/
context.go
56 lines (50 loc) · 1.99 KB
/
context.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016 Datadog, Inc.
package tracer
import (
"context"
v2mock "github.com/DataDog/dd-trace-go/v2/ddtrace/mocktracer"
v2 "github.com/DataDog/dd-trace-go/v2/ddtrace/tracer"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/internal"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/mocktracer"
)
// ContextWithSpan returns a copy of the given context which includes the span s.
func ContextWithSpan(ctx context.Context, s Span) context.Context {
if ctx == nil {
ctx = context.Background()
}
return context.WithValue(ctx, internal.ActiveSpanKey, s)
}
// SpanFromContext returns the span contained in the given context. A second return
// value indicates if a span was found in the context. If no span is found, a no-op
// span is returned.
func SpanFromContext(ctx context.Context) (Span, bool) {
if ctx == nil {
return internal.NoopSpan{}, false
}
v := ctx.Value(internal.ActiveSpanKey)
switch v.(type) {
case internal.SpanV2Adapter:
sa := v.(internal.SpanV2Adapter)
if mocktracer.IsActive() {
return mocktracer.MockspanV2Adapter{Span: v2mock.MockSpan(sa.Span)}, true
}
return sa, true
case Span:
return v.(Span), true
default:
return internal.NoopSpan{}, false
}
}
// StartSpanFromContext returns a new span with the given operation name and options. If a span
// is found in the context, it will be used as the parent of the resulting span. If the ChildOf
// option is passed, it will only be used as the parent if there is no span found in `ctx`.
func StartSpanFromContext(ctx context.Context, operationName string, opts ...StartSpanOption) (Span, context.Context) {
cfg := internal.BuildStartSpanConfigV2(opts...)
span, ctx := v2.StartSpanFromContext(ctx, operationName, v2.WithStartSpanConfig(cfg))
sa := internal.SpanV2Adapter{Span: span}
ctx = ContextWithSpan(ctx, sa)
return sa, ctx
}