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opentelemetry-go/api/trace/current.go
2019-08-13 16:03:40 -07:00

37 lines
987 B
Go

// Copyright 2019, OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package trace
import (
"context"
)
type currentSpanKeyType struct{}
var (
currentSpanKey = &currentSpanKeyType{}
)
func SetCurrentSpan(ctx context.Context, span Span) context.Context {
return context.WithValue(ctx, currentSpanKey, span)
}
func CurrentSpan(ctx context.Context) Span {
if span, has := ctx.Value(currentSpanKey).(Span); has {
return span
}
return NoopSpan{}
}