minio/logger-redis.go

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/*
* Minio Cloud Storage, (C) 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 main
import (
"time"
"github.com/Sirupsen/logrus"
"github.com/minio/redigo/redis"
)
// redisLogger to send logs to Redis server
type redisLogger struct {
Enable bool `json:"enable"`
Level string `json:"level"`
Addr string `json:"address"`
Password string `json:"password"`
Key string `json:"key"`
}
type redisConn struct {
*redis.Pool
params redisLogger
}
// Dial a new connection to redis instance at addr, optionally with a password if any.
func dialRedis(rLogger redisLogger) (*redis.Pool, error) {
// Return error if redis not enabled.
if !rLogger.Enable {
return nil, errLoggerNotEnabled
}
addr := rLogger.Addr
password := rLogger.Password
rPool := &redis.Pool{
MaxIdle: 3,
IdleTimeout: 240 * time.Second,
Dial: func() (redis.Conn, error) {
c, err := redis.Dial("tcp", addr)
if err != nil {
return nil, err
}
if password != "" {
if _, derr := c.Do("AUTH", password); derr != nil {
c.Close()
return nil, derr
}
}
return c, err
},
TestOnBorrow: func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
},
}
// Test if connection with REDIS can be established.
rConn := rPool.Get()
defer rConn.Close()
// Check connection.
_, err := rConn.Do("PING")
if err != nil {
return nil, err
}
// Return pool.
return rPool, nil
}
func enableRedisLogger() error {
rLogger := serverConfig.GetRedisLogger()
// Dial redis.
rPool, err := dialRedis(rLogger)
if err != nil {
return err
}
rrConn := redisConn{
Pool: rPool,
params: rLogger,
}
lvl, err := logrus.ParseLevel(rLogger.Level)
fatalIf(err, "Unknown log level found in the config file.")
// Add a elasticsearch hook.
log.Hooks.Add(rrConn)
// Set default JSON formatter.
log.Formatter = new(logrus.JSONFormatter)
// Set default log level to info.
log.Level = lvl
return nil
}
func (r redisConn) Fire(entry *logrus.Entry) error {
rConn := r.Pool.Get()
defer rConn.Close()
data, err := entry.String()
if err != nil {
return err
}
_, err = rConn.Do("RPUSH", r.params.Key, data)
if err != nil {
return err
}
return nil
}
// Required for logrus hook implementation
func (r redisConn) Levels() []logrus.Level {
return []logrus.Level{
logrus.PanicLevel,
logrus.FatalLevel,
logrus.ErrorLevel,
logrus.WarnLevel,
logrus.InfoLevel,
logrus.DebugLevel,
}
}