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log.go
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log.go
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// graceful package shutdown or reboot current process gracefully.
//
// Copyright 2022 AndeyaLee. All Rights Reserved.
//
// 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 graceful
import (
logPkg "log"
)
var log LoggerWithFlusher = loggerWithFlusher{new(logger)}
type (
// Logger logger interface
Logger interface {
// Infof logs a message using INFO as log level.
Infof(format string, v ...interface{})
// Errorf logs a message using ERROR as log level.
Errorf(format string, v ...interface{})
}
// LoggerWithFlusher logger interface with flusher
LoggerWithFlusher interface {
Logger
// Flush writes any buffered log to the underlying io.Writer.
Flush() error
}
logger struct{}
loggerWithFlusher struct{ Logger }
)
func (l *logger) Infof(format string, v ...interface{}) {
logPkg.Printf("[I] "+format, v...)
}
func (l *logger) Errorf(format string, v ...interface{}) {
logPkg.Printf("[E] "+format, v...)
}
func (l loggerWithFlusher) Flush() error {
nl, ok := l.Logger.(LoggerWithFlusher)
if ok {
return nl.Flush()
}
return nil
}
// SetLog resets logger.
// NOTE:
// the logger is best to implement LoggerWithFlusher interface
func SetLog(logger Logger) {
l, ok := logger.(LoggerWithFlusher)
if ok {
log = l
} else {
log = loggerWithFlusher{logger}
}
}