MinIO/cmd/logger-console-hook.go

/*
 * Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
 *
 * 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 cmd

import (
	"fmt"
	"strings"

	"github.com/Sirupsen/logrus"
)

// consoleLogger - default logger if not other logging is enabled.
type consoleLogger struct {
	Enable bool   `json:"enable"`
	Level  string `json:"level"`
}

func (c *consoleLogger) Validate() error {
	level := strings.ToLower(c.Level)
	if level != "error" && level != "fatal" && level != "" {
		return fmt.Errorf("`%s` level value not recognized", c.Level)
	}
	return nil
}

// enable console logger.
func enableConsoleLogger() {
	clogger := serverConfig.Logger.GetConsole()
	if !clogger.Enable {
		return
	}

	consoleLogger := logrus.New()

	// log.Out and log.Formatter use the default versions.
	// Only set specific log level.
	lvl, err := logrus.ParseLevel(clogger.Level)
	fatalIf(err, "Unknown log level found in the config file.")

	consoleLogger.Level = lvl
	consoleLogger.Formatter = new(logrus.TextFormatter)
	log.mu.Lock()
	log.loggers = append(log.loggers, consoleLogger)
	log.mu.Unlock()
}