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elasticsearch.go
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elasticsearch.go
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// Copyright 2021 iLogtail Authors
//
// 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 subscriber
import (
"context"
"encoding/json"
"log"
"errors"
"time"
"strings"
"github.com/elastic/go-elasticsearch/v8"
"github.com/mitchellh/mapstructure"
"github.com/alibaba/ilogtail/pkg/doc"
"github.com/alibaba/ilogtail/pkg/logger"
"github.com/alibaba/ilogtail/pkg/protocol"
)
const elasticSearchName = "elasticsearch"
var r map[string]interface{}
type ElasticSearchSubscriber struct {
Address string `mapstructure:"address" comment:"the elasticsearch address"`
Username string `mapstructure:"username" comment:"the elasticsearch username"`
Password string `mapstructure:"password" comment:"the elasticsearch password"`
Index string `mapstructure:"index" comment:"the elasticsearch index name to query from"`
QueryIntervalMs int `mapstructure:"query_interval_ms" comment:"interval between queries select upserts records from elasticsearch"`
client *elasticsearch.Client
lastTimestamp int64
channel chan *protocol.LogGroup
stopCh chan struct{}
}
func (i *ElasticSearchSubscriber) Name() string {
return elasticSearchName
}
func (i *ElasticSearchSubscriber) Description() string {
return "this's a elasticsearch subscriber, which will query inserted records from elasticsearch periodically."
}
func (i *ElasticSearchSubscriber) Start() error {
host, err := TryReplacePhysicalAddress(i.Address)
if err != nil {
return err
}
host = strings.ReplaceAll(host, "http://", "")
cfg := elasticsearch.Config{
Addresses: []string{i.Address},
Username: i.Username,
Password: i.Password,
}
es, err := elasticsearch.NewClient(cfg)
if err != nil {
logger.Warningf(context.Background(), "ELASTICSEARCH_SUBSCRIBER_ALARM", "failed to create elasticsearch client, host %, err: %s", host, err)
return err
}
i.client = es
go i.runQueryRecordsTask()
return nil
}
func (i *ElasticSearchSubscriber) Stop() {
close(i.stopCh)
}
func (i *ElasticSearchSubscriber) SubscribeChan() <-chan *protocol.LogGroup {
return i.channel
}
func (i *ElasticSearchSubscriber) FlusherConfig() string {
return ""
}
func (i *ElasticSearchSubscriber) runQueryRecordsTask() {
for {
select {
case <-i.stopCh:
close(i.channel)
return
case <-time.After(time.Duration(i.QueryIntervalMs) * time.Millisecond):
logGroup, maxTimestamp, err := i.queryRecords()
if err != nil {
logger.Warning(context.Background(), "CLICKHOUSE_SUBSCRIBER_ALARM", "err", err)
continue
}
logger.Debugf(context.Background(), "subscriber get new logs maxTimestamp: %d, count: %v", maxTimestamp, len(logGroup.Logs))
i.channel <- logGroup
if maxTimestamp > i.lastTimestamp {
i.lastTimestamp = maxTimestamp
}
}
}
}
func (i *ElasticSearchSubscriber) queryRecords() (logGroup *protocol.LogGroup, maxTimestamp int64, err error) {
logGroup = &protocol.LogGroup{
Logs: []*protocol.Log{},
}
// s := fmt.Sprintf(clickhouseQuerySQL, i.Database, i.Table, i.lastTimestamp)
// rows, err := i.client.Query(context.Background(), s)
res, err := i.client.Search(
i.client.Search.WithContext(context.Background()),
i.client.Search.WithIndex(i.Index),
i.client.Search.WithBody(strings.NewReader(`{"query" : { "match_all" : { } }}`)),
)
if err != nil {
logger.Warning(context.Background(), "ELASTICSEARCH_SUBSCRIBER_ALARM", "err", err)
return
}
if err = json.NewDecoder(res.Body).Decode(&r); err != nil {
log.Fatalf("Error parsing the response body: %s", err)
}
type logContent struct {
Contents struct {
Index string `json:"Index"`
Content string `json:"Content"`
} `json:"contents"`
Tags struct {
HostIP string `json:"host.ip"`
HostName string `json:"host.name"`
} `json:"tags"`
Time int `json:"time"`
}
for _, hit := range r["hits"].(map[string]interface{})["hits"].([]interface{}) {
tmpJSON, _ := json.Marshal(hit.(map[string]interface{})["_source"])
lc := logContent{}
err = json.Unmarshal(tmpJSON, &lc)
if err != nil {
logger.Warning(context.Background(), "ELASTICSEARCH_SUBSCRIBER_ALARM", "err", err)
}
if int64(lc.Time) > maxTimestamp {
maxTimestamp = int64(lc.Time)
}
log := &protocol.Log{
Contents: []*protocol.Log_Content{
{Key: "index", Value: lc.Contents.Index},
{Key: "content", Value: lc.Contents.Content},
},
}
logGroup.Logs = append(logGroup.Logs, log)
}
return
}
func init() {
RegisterCreator(elasticSearchName, func(spec map[string]interface{}) (Subscriber, error) {
i := &ElasticSearchSubscriber{}
if err := mapstructure.Decode(spec, i); err != nil {
return nil, err
}
if i.Address == "" {
return nil, errors.New("addr must not be empty")
}
if i.QueryIntervalMs <= 0 {
i.QueryIntervalMs = 1000
}
if i.Username == "" {
return nil, errors.New("username must not be empty")
}
if i.Password == "" {
return nil, errors.New("password must not be empty")
}
i.channel = make(chan *protocol.LogGroup, 10)
i.stopCh = make(chan struct{})
return i, nil
})
doc.Register("subscriber", elasticSearchName, new(ElasticSearchSubscriber))
}