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context.go
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context.go
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// Copyright 2022 Douyu
//
// 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 xlog
import (
"context"
)
const (
traceIDField = "trace_id"
)
type (
loggerKey struct{}
traceIDKey struct{}
)
func NewContext(ctx context.Context, l *Logger) context.Context {
traceID := GetTraceID(ctx)
if traceID == "" {
return context.WithValue(ctx, loggerKey{}, l)
}
return context.WithValue(ctx, loggerKey{}, l.With(String(traceIDField, traceID)))
}
func FromContext(ctx context.Context) *Logger {
l, ok := ctx.Value(loggerKey{}).(*Logger)
if !ok {
return DefaultLogger // default logger
}
return l
}
func SetTraceID(ctx context.Context, traceID string) context.Context {
if traceID == "" {
return ctx
}
return context.WithValue(ctx, traceIDKey{}, traceID)
}
func GetTraceID(ctx context.Context) string {
traceID, ok := ctx.Value(traceIDKey{}).(string)
if !ok {
return ""
}
return traceID
}