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minio/pkg/event/target/elasticsearch.go

154 lines
3.9 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 (
"context"
"errors"
"fmt"
"net/url"
"strings"
"time"
"github.com/minio/minio/pkg/event"
xnet "github.com/minio/minio/pkg/net"
"gopkg.in/olivere/elastic.v5"
)
// ElasticsearchArgs - Elasticsearch target arguments.
type ElasticsearchArgs struct {
Enable bool `json:"enable"`
Format string `json:"format"`
URL xnet.URL `json:"url"`
Index string `json:"index"`
}
// Validate ElasticsearchArgs fields
func (a ElasticsearchArgs) Validate() error {
if !a.Enable {
return nil
}
if a.URL.IsEmpty() {
return errors.New("empty URL")
}
if a.Format != "" {
f := strings.ToLower(a.Format)
if f != event.NamespaceFormat && f != event.AccessFormat {
return errors.New("format value unrecognized")
}
}
if a.Index == "" {
return errors.New("empty index value")
}
return nil
}
// ElasticsearchTarget - Elasticsearch target.
type ElasticsearchTarget struct {
id event.TargetID
args ElasticsearchArgs
client *elastic.Client
}
// ID - returns target ID.
func (target *ElasticsearchTarget) ID() event.TargetID {
return target.id
}
// Send - sends event to Elasticsearch.
func (target *ElasticsearchTarget) Send(eventData event.Event) (err error) {
var key string
remove := func() error {
_, err := target.client.Delete().Index(target.args.Index).Type("event").Id(key).Do(context.Background())
return err
}
update := func() error {
_, err := target.client.Index().Index(target.args.Index).Type("event").BodyJson(map[string]interface{}{"Records": []event.Event{eventData}}).Id(key).Do(context.Background())
return err
}
add := func() error {
eventTime, err := time.Parse(event.AMZTimeFormat, eventData.EventTime)
if err != nil {
return err
}
eventTimeMS := fmt.Sprintf("%d", eventTime.UnixNano()/1000000)
_, err = target.client.Index().Index(target.args.Index).Type("event").Timestamp(eventTimeMS).BodyJson(map[string]interface{}{"Records": []event.Event{eventData}}).Do(context.Background())
return err
}
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 = remove()
} else {
err = update()
}
return err
}
if target.args.Format == event.AccessFormat {
return add()
}
return nil
}
// Close - does nothing and available for interface compatibility.
func (target *ElasticsearchTarget) Close() error {
return nil
}
// NewElasticsearchTarget - creates new Elasticsearch target.
func NewElasticsearchTarget(id string, args ElasticsearchArgs) (*ElasticsearchTarget, error) {
client, err := elastic.NewClient(elastic.SetURL(args.URL.String()), elastic.SetSniff(false), elastic.SetMaxRetries(10))
if err != nil {
return nil, err
}
exists, err := client.IndexExists(args.Index).Do(context.Background())
if err != nil {
return nil, err
}
if !exists {
var createIndex *elastic.IndicesCreateResult
if createIndex, err = client.CreateIndex(args.Index).Do(context.Background()); err != nil {
return nil, err
}
if !createIndex.Acknowledged {
return nil, fmt.Errorf("index %v not created", args.Index)
}
}
return &ElasticsearchTarget{
id: event.TargetID{id, "elasticsearch"},
args: args,
client: client,
}, nil
}