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// Copyright 2013, Örjan Persson. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package logging
// defaultBackend is the backend used for all logging calls.
var defaultBackend LeveledBackend
// Backend is the interface which a log backend need to implement to be able to
// be used as a logging backend.
type Backend interface {
Log(Level, int, *Record) error
// SetBackend replaces the backend currently set with the given new logging
// backend.
func SetBackend(backends ...Backend) LeveledBackend {
var backend Backend
if len(backends) == 1 {
backend = backends[0]
} else {
backend = MultiLogger(backends...)
defaultBackend = AddModuleLevel(backend)
return defaultBackend
// SetLevel sets the logging level for the specified module. The module
// corresponds to the string specified in GetLogger.
func SetLevel(level Level, module string) {
defaultBackend.SetLevel(level, module)
// GetLevel returns the logging level for the specified module.
func GetLevel(module string) Level {
return defaultBackend.GetLevel(module)
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