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trace_context.go
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trace_context.go
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// Copyright 2022-2023 The sacloud/go-otelsetup 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 otelsetup
import (
"context"
"os"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
)
// ContextForTrace 環境変数からトレースコンテキストを読み取り、propagator経由で値を反映させたコンテキストを返す
func ContextForTrace(ctx context.Context) context.Context {
if ctx == nil {
ctx = context.Background()
}
envCarrier := propagation.MapCarrier{}
for _, key := range (propagation.TraceContext{}).Fields() {
envCarrier.Set(key, os.Getenv(key))
}
return otel.GetTextMapPropagator().Extract(ctx, envCarrier)
}
// ExtractTextMapCarrier 現在のコンテキストからTextMapCarrierを抽出する
func ExtractTextMapCarrier(ctx context.Context) propagation.TextMapCarrier {
envCarrier := propagation.MapCarrier{}
otel.GetTextMapPropagator().Inject(ctx, envCarrier)
return envCarrier
}