/
ctxzap.go
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/
ctxzap.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 ctxzap
import (
"context"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
type loggerKey struct{}
type ctxLogger struct {
logger *zap.Logger
fields []zapcore.Field
}
var (
nullLogger = zap.NewNop()
StdoutLogger, _ = zap.NewProduction()
)
// WithFields adds zap fields to the logger.
func WithFields(ctx context.Context, fields ...zapcore.Field) {
l, ok := ctx.Value(loggerKey{}).(*ctxLogger)
if !ok || l == nil {
return
}
l.fields = append(l.fields, fields...)
}
// Logger takes the call-scoped Logger from zap log middleware.
// It always returns a Logger that has all the zapcore.Field updated.
func Logger(ctx context.Context) *zap.Logger {
l, ok := ctx.Value(loggerKey{}).(*ctxLogger)
if !ok || l == nil {
return nullLogger
}
return l.logger.With(l.fields...)
}
// WithLogger adds the zap.Logger to the context for extraction later.
// Returning the new context that has been created.
func WithLogger(ctx context.Context, logger *zap.Logger) context.Context {
return context.WithValue(ctx, loggerKey{}, &ctxLogger{
logger: logger,
})
}