server: Move all the top level files into cmd folder. (#2490)

This change brings a change which was done for the 'mc'
package to allow for clean repo and have a cleaner
github drop in experience.

cmd/notify-redis.go

@@ -0,0 +1,133 @@
+/*
+ * 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 cmd
+
+import (
+	"io/ioutil"
+	"time"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/minio/redigo/redis"
+)
+
+// redisNotify to send logs to Redis server
+type redisNotify struct {
+	Enable   bool   `json:"enable"`
+	Addr     string `json:"address"`
+	Password string `json:"password"`
+	Key      string `json:"key"`
+}
+
+type redisConn struct {
+	*redis.Pool
+	params redisNotify
+}
+
+// Dial a new connection to redis instance at addr, optionally with a password if any.
+func dialRedis(rNotify redisNotify) (*redis.Pool, error) {
+	// Return error if redis not enabled.
+	if !rNotify.Enable {
+		return nil, errNotifyNotEnabled
+	}
+	addr := rNotify.Addr
+	password := rNotify.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 newRedisNotify(accountID string) (*logrus.Logger, error) {
+	rNotify := serverConfig.GetRedisNotifyByID(accountID)
+
+	// Dial redis.
+	rPool, err := dialRedis(rNotify)
+	if err != nil {
+		return nil, err
+	}
+
+	rrConn := redisConn{
+		Pool:   rPool,
+		params: rNotify,
+	}
+
+	redisLog := logrus.New()
+
+	redisLog.Out = ioutil.Discard
+
+	// Set default JSON formatter.
+	redisLog.Formatter = new(logrus.JSONFormatter)
+
+	redisLog.Hooks.Add(rrConn)
+
+	// Success, redis enabled.
+	return redisLog, nil
+}
+
+// Fire is called when an event should be sent to the message broker.
+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.InfoLevel,
+	}
+}