func initLogging(args *CommandLineArgs) {
	//close any existing log handlers.
	log.Close()
	// Get and check log mode.
	LogModes = strings.Split(Cfg.Section("log").Key("mode").MustString("console"), ",")
	LogsPath = makeAbsolute(Cfg.Section("paths").Key("logs").String(), HomePath)

	LogConfigs = make([]util.DynMap, len(LogModes))
	for i, mode := range LogModes {
		mode = strings.TrimSpace(mode)
		sec, err := Cfg.GetSection("log." + mode)
		if err != nil {
			log.Fatal(4, "Unknown log mode: %s", mode)
		}

		// Log level.
		levelName := Cfg.Section("log."+mode).Key("level").In("Trace",
			[]string{"Trace", "Debug", "Info", "Warn", "Error", "Critical"})
		level, ok := logLevels[levelName]
		if !ok {
			log.Fatal(4, "Unknown log level: %s", levelName)
		}

		// Generate log configuration.
		switch mode {
		case "console":
			formatting := sec.Key("formatting").MustBool(true)
			LogConfigs[i] = util.DynMap{
				"level":      level,
				"formatting": formatting,
			}
		case "file":
			logPath := sec.Key("file_name").MustString(filepath.Join(LogsPath, "grafana.log"))
			os.MkdirAll(filepath.Dir(logPath), os.ModePerm)
			LogConfigs[i] = util.DynMap{
				"level":    level,
				"filename": logPath,
				"rotate":   sec.Key("log_rotate").MustBool(true),
				"maxlines": sec.Key("max_lines").MustInt(1000000),
				"maxsize":  1 << uint(sec.Key("max_size_shift").MustInt(28)),
				"daily":    sec.Key("daily_rotate").MustBool(true),
				"maxdays":  sec.Key("max_days").MustInt(7),
			}
		case "conn":
			LogConfigs[i] = util.DynMap{
				"level":          level,
				"reconnectOnMsg": sec.Key("reconnect_on_msg").MustBool(),
				"reconnect":      sec.Key("reconnect").MustBool(),
				"net":            sec.Key("protocol").In("tcp", []string{"tcp", "unix", "udp"}),
				"addr":           sec.Key("addr").MustString(":7020"),
			}
		case "smtp":
			LogConfigs[i] = util.DynMap{
				"level":     level,
				"user":      sec.Key("user").MustString("*****@*****.**"),
				"passwd":    sec.Key("passwd").MustString("******"),
				"host":      sec.Key("host").MustString("127.0.0.1:25"),
				"receivers": sec.Key("receivers").MustString("[]"),
				"subject":   sec.Key("subject").MustString("Diagnostic message from serve"),
			}
		case "database":
			LogConfigs[i] = util.DynMap{
				"level":  level,
				"driver": sec.Key("driver").String(),
				"conn":   sec.Key("conn").String(),
			}
		}

		cfgJsonBytes, _ := json.Marshal(LogConfigs[i])
		log.NewLogger(Cfg.Section("log").Key("buffer_len").MustInt64(10000), mode, string(cfgJsonBytes))
	}
}
func init() {
	IsWindows = runtime.GOOS == "windows"
	log.NewLogger(0, "console", `{"level": 0, "formatting":true}`)
}