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minio/pkg/event/target/redis.go

177 lines
4.0 KiB

/*
* Minio Cloud Storage, (C) 2018 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 target
import (
"encoding/json"
"fmt"
"net/url"
"strings"
"time"
"github.com/garyburd/redigo/redis"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
)
// RedisArgs - Redis target arguments.
type RedisArgs struct {
Enable bool `json:"enable"`
Format string `json:"format"`
Addr xnet.Host `json:"address"`
Password string `json:"password"`
Key string `json:"key"`
}
// Validate RedisArgs fields
func (r RedisArgs) Validate() error {
if !r.Enable {
return nil
}
if r.Format != "" {
f := strings.ToLower(r.Format)
if f != event.NamespaceFormat && f != event.AccessFormat {
return fmt.Errorf("unrecognized format")
}
}
if r.Key == "" {
return fmt.Errorf("empty key")
}
return nil
}
// RedisTarget - Redis target.
type RedisTarget struct {
id event.TargetID
args RedisArgs
pool *redis.Pool
}
// ID - returns target ID.
func (target *RedisTarget) ID() event.TargetID {
return target.id
}
// Send - sends event to Redis.
func (target *RedisTarget) Send(eventData event.Event) error {
conn := target.pool.Get()
defer func() {
// FIXME: log returned error. ignore time being.
_ = conn.Close()
}()
if target.args.Format == event.NamespaceFormat {
objectName, err := url.QueryUnescape(eventData.S3.Object.Key)
if err != nil {
return err
}
key := eventData.S3.Bucket.Name + "/" + objectName
if eventData.EventName == event.ObjectRemovedDelete {
_, err = conn.Do("HDEL", target.args.Key, key)
} else {
var data []byte
if data, err = json.Marshal(struct{ Records []event.Event }{[]event.Event{eventData}}); err != nil {
return err
}
_, err = conn.Do("HSET", target.args.Key, key, data)
}
return err
}
if target.args.Format == event.AccessFormat {
data, err := json.Marshal([]interface{}{eventData.EventTime, []event.Event{eventData}})
if err != nil {
return err
}
_, err = conn.Do("RPUSH", target.args.Key, data)
return err
}
return nil
}
// Close - does nothing and available for interface compatibility.
func (target *RedisTarget) Close() error {
return nil
}
// NewRedisTarget - creates new Redis target.
func NewRedisTarget(id string, args RedisArgs) (*RedisTarget, error) {
pool := &redis.Pool{
MaxIdle: 3,
IdleTimeout: 2 * 60 * time.Second,
Dial: func() (redis.Conn, error) {
conn, err := redis.Dial("tcp", args.Addr.String())
if err != nil {
return nil, err
}
if args.Password == "" {
return conn, nil
}
if _, err = conn.Do("AUTH", args.Password); err != nil {
// FIXME: log returned error. ignore time being.
_ = conn.Close()
return nil, err
}
return conn, nil
},
TestOnBorrow: func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
},
}
conn := pool.Get()
defer func() {
// FIXME: log returned error. ignore time being.
_ = conn.Close()
}()
if _, err := conn.Do("PING"); err != nil {
return nil, err
}
typeAvailable, err := redis.String(conn.Do("TYPE", args.Key))
if err != nil {
return nil, err
}
if typeAvailable != "none" {
expectedType := "hash"
if args.Format == event.AccessFormat {
expectedType = "list"
}
if typeAvailable != expectedType {
return nil, fmt.Errorf("expected type %v does not match with available type %v", expectedType, typeAvailable)
}
}
return &RedisTarget{
id: event.TargetID{ID: id, Name: "redis"},
args: args,
pool: pool,
}, nil
}