1// Copyright 2013, Örjan Persson. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package logging
6
7import (
8	"sync"
9)
10
11// defaultBackend is the backend used for all logging calls.
12var defaultBackend LeveledBackend
13var defaultBackendMutex sync.RWMutex
14
15// Backend is the interface which a log backend need to implement to be able to
16// be used as a logging backend.
17type Backend interface {
18	Log(Level, int, *Record) error
19}
20
21// SetBackend replaces the backend currently set with the given new logging
22// backend.
23func SetBackend(backends ...Backend) LeveledBackend {
24	var backend Backend
25	if len(backends) == 1 {
26		backend = backends[0]
27	} else {
28		backend = MultiLogger(backends...)
29	}
30
31	defaultBackendMutex.Lock()
32	defer defaultBackendMutex.Unlock()
33	defaultBackend = AddModuleLevel(backend)
34	return defaultBackend
35}
36
37// SetLevel sets the logging level for the specified module. The module
38// corresponds to the string specified in GetLogger.
39func SetLevel(level Level, module string) {
40	defaultBackend.SetLevel(level, module)
41}
42
43// GetLevel returns the logging level for the specified module.
44func GetLevel(module string) Level {
45	return defaultBackend.GetLevel(module)
46}
47