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wrapper.go
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wrapper.go
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// Copyright 2018 Amazon.com, Inc. or its affiliates. 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. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 log is used to initialize the logger.
package log
import (
"sync"
)
// DelegateLogger holds the base logger for logging
type DelegateLogger struct {
BaseLoggerInstance BasicT
}
// Wrapper is a logger that can modify the format of a log message before delegating to another logger.
type Wrapper struct {
Format FormatFilter
M *sync.Mutex
Delegate *DelegateLogger
}
// FormatFilter can modify the format and or parameters to be passed to a logger.
type FormatFilter interface {
// Filter modifies parameters that will be passed to log.Debug, log.Info, etc.
Filter(params ...interface{}) (newParams []interface{})
// Filter modifies format and/or parameter strings that will be passed to log.Debugf, log.Infof, etc.
Filterf(format string, params ...interface{}) (newFormat string, newParams []interface{})
}
// WithContext creates a wrapper logger with context
func (w *Wrapper) WithContext(context ...string) (contextLogger T) {
formatFilter := &ContextFormatFilter{Context: context}
contextLogger = &Wrapper{Format: formatFilter, M: w.M, Delegate: w.Delegate}
return contextLogger
}
// Tracef formats message according to format specifier
// and writes to log with level = Trace.
func (w *Wrapper) Tracef(format string, params ...interface{}) {
format, params = w.Format.Filterf(format, params...)
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Tracef(format, params...)
}
// Debugf formats message according to format specifier
// and writes to log with level = Debug.
func (w *Wrapper) Debugf(format string, params ...interface{}) {
format, params = w.Format.Filterf(format, params...)
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Debugf(format, params...)
}
// Infof formats message according to format specifier
// and writes to log with level = Info.
func (w *Wrapper) Infof(format string, params ...interface{}) {
format, params = w.Format.Filterf(format, params...)
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Infof(format, params...)
}
// Warnf formats message according to format specifier
// and writes to log with level = Warn.
func (w *Wrapper) Warnf(format string, params ...interface{}) error {
format, params = w.Format.Filterf(format, params...)
w.M.Lock()
defer w.M.Unlock()
return w.Delegate.BaseLoggerInstance.Warnf(format, params...)
}
// Errorf formats message according to format specifier
// and writes to log with level = Error.
func (w *Wrapper) Errorf(format string, params ...interface{}) error {
format, params = w.Format.Filterf(format, params...)
w.M.Lock()
defer w.M.Unlock()
return w.Delegate.BaseLoggerInstance.Errorf(format, params...)
}
// Criticalf formats message according to format specifier
// and writes to log with level = Critical.
func (w *Wrapper) Criticalf(format string, params ...interface{}) error {
format, params = w.Format.Filterf(format, params...)
w.M.Lock()
defer w.M.Unlock()
return w.Delegate.BaseLoggerInstance.Criticalf(format, params...)
}
// Trace formats message using the default formats for its operands
// and writes to log with level = Trace
func (w *Wrapper) Trace(v ...interface{}) {
v = w.Format.Filter(v...)
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Trace(v...)
}
// Debug formats message using the default formats for its operands
// and writes to log with level = Debug
func (w *Wrapper) Debug(v ...interface{}) {
v = w.Format.Filter(v...)
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Debug(v...)
}
// Info formats message using the default formats for its operands
// and writes to log with level = Info
func (w *Wrapper) Info(v ...interface{}) {
v = w.Format.Filter(v...)
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Info(v...)
}
// Warn formats message using the default formats for its operands
// and writes to log with level = Warn
func (w *Wrapper) Warn(v ...interface{}) error {
v = w.Format.Filter(v...)
w.M.Lock()
defer w.M.Unlock()
return w.Delegate.BaseLoggerInstance.Warn(v...)
}
// Error formats message using the default formats for its operands
// and writes to log with level = Error
func (w *Wrapper) Error(v ...interface{}) error {
v = w.Format.Filter(v...)
w.M.Lock()
defer w.M.Unlock()
return w.Delegate.BaseLoggerInstance.Error(v...)
}
// Critical formats message using the default formats for its operands
// and writes to log with level = Critical
func (w *Wrapper) Critical(v ...interface{}) error {
v = w.Format.Filter(v...)
w.M.Lock()
defer w.M.Unlock()
return w.Delegate.BaseLoggerInstance.Critical(v...)
}
// Flush flushes all the messages in the logger.
func (w *Wrapper) Flush() {
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Flush()
}
// Close flushes all the messages in the logger and closes it. It cannot be used after this operation.
func (w *Wrapper) Close() {
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Close()
}
// ReplaceDelegate replaces the delegate logger with a new logger
func (w *Wrapper) ReplaceDelegate(newLogger BasicT) {
w.M.Lock()
defer w.M.Unlock()
w.Delegate.BaseLoggerInstance.Flush()
w.Delegate.BaseLoggerInstance = newLogger
w.Delegate.BaseLoggerInstance.Info("Logger Replaced. New Logger Used to log the message")
}