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minio/cmd/notify-redis.go

224 lines
5.5 KiB

/*
* 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 (
"encoding/json"
"fmt"
"io/ioutil"
"time"
"github.com/Sirupsen/logrus"
"github.com/garyburd/redigo/redis"
)
func makeRedisError(msg string, a ...interface{}) error {
s := fmt.Sprintf(msg, a...)
return fmt.Errorf("Redis Notifier Error: %s", s)
}
var (
rdNFormatError = makeRedisError(`"format" value is invalid - it must be one of "access" or "namespace".`)
rdNKeyError = makeRedisError("Key was not specified in the configuration.")
)
// redisNotify to send logs to Redis server
type redisNotify struct {
Enable bool `json:"enable"`
Format string `json:"format"`
Addr string `json:"address"`
Password string `json:"password"`
Key string `json:"key"`
}
func (r *redisNotify) Validate() error {
if !r.Enable {
return nil
}
if r.Format != formatNamespace && r.Format != formatAccess {
return rdNFormatError
}
if _, err := checkURL(r.Addr); err != nil {
return err
}
if r.Key == "" {
return rdNKeyError
}
return nil
}
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, // Time 2minutes.
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, makeRedisError("Error connecting to server: %v", err)
}
// Test that Key is of desired type
reply, err := redis.String(rConn.Do("TYPE", rNotify.Key))
if err != nil {
return nil, makeRedisError("Error getting type of Key=%s: %v",
rNotify.Key, err)
}
if reply != "none" {
expectedType := "hash"
if rNotify.Format == formatAccess {
expectedType = "list"
}
if reply != expectedType {
return nil, makeRedisError(
"Key=%s has type %s, but we expect it to be a %s",
rNotify.Key, reply, expectedType)
}
}
// Return pool.
return rPool, nil
}
func newRedisNotify(accountID string) (*logrus.Logger, error) {
rNotify := serverConfig.Notify.GetRedisByID(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()
// Fetch event type upon reflecting on its original type.
entryStr, ok := entry.Data["EventType"].(string)
if !ok {
return nil
}
switch r.params.Format {
case formatNamespace:
// Match the event if its a delete request, attempt to delete the key
if eventMatch(entryStr, []string{"s3:ObjectRemoved:*"}) {
_, err := rConn.Do("HDEL", r.params.Key, entry.Data["Key"])
if err != nil {
return makeRedisError("Error deleting entry: %v",
err)
}
return nil
} // else save this as new entry or update any existing ones.
value, err := json.Marshal(map[string]interface{}{
"Records": entry.Data["Records"],
})
if err != nil {
return makeRedisError(
"Unable to encode event %v to JSON: %v",
entry.Data["Records"], err)
}
_, err = rConn.Do("HSET", r.params.Key, entry.Data["Key"],
value)
if err != nil {
return makeRedisError("Error updating hash entry: %v",
err)
}
case formatAccess:
// eventTime is taken from the first entry in the
// records.
events, ok := entry.Data["Records"].([]NotificationEvent)
if !ok {
return makeRedisError("unable to extract event time due to conversion error of entry.Data[\"Records\"]=%v", entry.Data["Records"])
}
eventTime := events[0].EventTime
listEntry := []interface{}{eventTime, entry.Data["Records"]}
jsonValue, err := json.Marshal(listEntry)
if err != nil {
return makeRedisError("JSON encoding error: %v", err)
}
_, err = rConn.Do("RPUSH", r.params.Key, jsonValue)
if err != nil {
return makeRedisError("Error appending to Redis list: %v",
err)
}
}
return nil
}
// Required for logrus hook implementation
func (r redisConn) Levels() []logrus.Level {
return []logrus.Level{
logrus.InfoLevel,
}
}