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logger.go
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logger.go
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// Copyright 2023 Mia srl
//
// 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 logging
import "context"
type Logger interface {
WithFields(fields map[string]any) Logger
WithField(field string, value any) Logger
Error(msg any)
Warn(msg any)
Info(msg any)
Debug(msg any)
Trace(msg any)
}
type noopLogger struct{}
func (l *noopLogger) WithFields(fields map[string]any) Logger {
return l
}
func (l *noopLogger) WithField(field string, value any) Logger {
return l
}
func (l noopLogger) Error(msg any) {}
func (l noopLogger) Info(msg any) {}
func (l noopLogger) Debug(msg any) {}
func (l noopLogger) Trace(msg any) {}
func (l noopLogger) Warn(msg any) {}
func NewNoOpLogger() Logger {
return &noopLogger{}
}
type loggerKey struct{}
func WithContext(ctx context.Context, logger Logger) context.Context {
return context.WithValue(ctx, loggerKey{}, logger)
}
func FromContext(ctx context.Context) Logger {
logger, ok := ctx.Value(loggerKey{}).(Logger)
if !ok {
return &noopLogger{}
}
return logger
}