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logger.go
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logger.go
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// (C) Copyright 2021 Hewlett Packard Enterprise Development LP
//
// 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 logger
import (
"context"
"github.com/sirupsen/logrus"
)
type Logger interface {
Debug(args ...interface{})
Print(args ...interface{})
Info(args ...interface{})
Warn(args ...interface{})
Warning(args ...interface{})
Error(args ...interface{})
Fatal(args ...interface{})
Debugf(format string, args ...interface{})
Infof(format string, args ...interface{})
Printf(format string, args ...interface{})
Warnf(format string, args ...interface{})
Warningf(format string, args ...interface{})
Errorf(format string, args ...interface{})
Fatalf(format string, args ...interface{})
WithField(key string, value interface{}) Logger
}
type logrusLogger struct {
*logrus.Entry
}
func (l logrusLogger) WithField(key string, value interface{}) Logger {
return logrusLogger{
Entry: l.Entry.WithField(key, value),
}
}
var standardLogger Logger = logrusLogger{
Entry: logrus.NewEntry(logrus.StandardLogger()),
}
func StandardLogger() Logger {
return standardLogger
}
type contextKey struct{}
var LoggerContextKey = contextKey{}
func ContextWithStandardLogger(parent context.Context) context.Context {
return ContextWithLogger(parent, standardLogger)
}
func ContextWithLogger(parent context.Context, logger Logger) context.Context {
return context.WithValue(parent, LoggerContextKey, logger)
}
func ContextWithField(ctx context.Context, key string, value interface{}) context.Context {
logger := FromContext(ctx)
if logger != nil {
return ContextWithLogger(ctx, logger.WithField(key, value))
}
return ContextWithLogger(ctx, standardLogger.WithField(key, value))
}
func FromContext(ctx context.Context) Logger {
value := ctx.Value(LoggerContextKey)
if value != nil {
return value.(Logger)
}
return nil
}
func Using(ctx context.Context) Logger {
logger := FromContext(ctx)
if logger != nil {
return logger
}
return standardLogger
}