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elasticsearch.go
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/
elasticsearch.go
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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 elasticsearch
import (
"fmt"
"net/url"
"strconv"
"time"
"github.com/golang/glog"
"errors"
"os"
elastic2 "gopkg.in/olivere/elastic.v3"
elastic5 "gopkg.in/olivere/elastic.v5"
)
const (
ESIndex = "heapster"
ESClusterName = "default"
)
type ElasticSearchService struct {
EsClient *esClient
baseIndex string
ClusterName string
}
func (esSvc *ElasticSearchService) Index(date time.Time) string {
return date.Format(fmt.Sprintf("%s-2006.01.02", esSvc.baseIndex))
}
func (esSvc *ElasticSearchService) IndexAlias(typeName string) string {
return fmt.Sprintf("%s-%s", esSvc.baseIndex, typeName)
}
func (esSvc *ElasticSearchService) FlushData() error {
return esSvc.EsClient.FlushBulk()
}
// SaveDataIntoES save metrics and events to ES by using ES client
func (esSvc *ElasticSearchService) SaveData(date time.Time, typeName string, sinkData []interface{}) error {
if typeName == "" || len(sinkData) == 0 {
return nil
}
indexName := esSvc.Index(date)
// Use the IndexExists service to check if a specified index exists.
exists, err := esSvc.EsClient.IndexExists(indexName)
if err != nil {
return err
}
if !exists {
// Create a new index.
createIndex, err := esSvc.EsClient.CreateIndex(indexName, mapping)
if err != nil {
return err
}
ack := false
switch i := createIndex.(type) {
case *elastic2.IndicesCreateResult:
ack = i.Acknowledged
case *elastic5.IndicesCreateResult:
ack = i.Acknowledged
}
if !ack {
return errors.New("Failed to acknoledge index creation")
}
}
aliases, err := esSvc.EsClient.GetAliases(indexName)
if err != nil {
return err
}
aliasName := esSvc.IndexAlias(typeName)
hasAlias := false
switch a := aliases.(type) {
case *elastic2.AliasesResult:
hasAlias = a.Indices[indexName].HasAlias(aliasName)
case *elastic5.AliasesResult:
hasAlias = a.Indices[indexName].HasAlias(aliasName)
}
if !hasAlias {
createAlias, err := esSvc.EsClient.AddAlias(indexName, esSvc.IndexAlias(typeName))
if err != nil {
return err
}
ack := false
switch i := createAlias.(type) {
case *elastic2.AliasResult:
ack = i.Acknowledged
case *elastic5.AliasResult:
ack = i.Acknowledged
}
if !ack {
return errors.New("Failed to acknoledge index alias creation")
}
}
for _, data := range sinkData {
esSvc.EsClient.AddBulkReq(indexName, typeName, data)
}
return nil
}
// CreateElasticSearchConfig creates an ElasticSearch configuration struct
// which contains an ElasticSearch client for later use
func CreateElasticSearchService(uri *url.URL) (*ElasticSearchService, error) {
var esSvc ElasticSearchService
opts, err := url.ParseQuery(uri.RawQuery)
if err != nil {
return nil, fmt.Errorf("Failed to parse url's query string: %s", err)
}
version := 5
if len(opts["ver"]) > 0 {
version, err = strconv.Atoi(opts["ver"][0])
if err != nil {
return nil, fmt.Errorf("Failed to parse URL's version value into an int: %v", err)
}
}
esSvc.ClusterName = ESClusterName
if len(opts["cluster_name"]) > 0 {
esSvc.ClusterName = opts["cluster_name"][0]
}
// set the index for es,the default value is "heapster"
esSvc.baseIndex = ESIndex
if len(opts["index"]) > 0 {
esSvc.baseIndex = opts["index"][0]
}
var startupFnsV5 []elastic5.ClientOptionFunc
var startupFnsV2 []elastic2.ClientOptionFunc
// Set the URL endpoints of the ES's nodes. Notice that when sniffing is
// enabled, these URLs are used to initially sniff the cluster on startup.
if len(opts["nodes"]) > 0 {
startupFnsV2 = append(startupFnsV2, elastic2.SetURL(opts["nodes"]...))
startupFnsV5 = append(startupFnsV5, elastic5.SetURL(opts["nodes"]...))
} else if uri.Scheme != "" && uri.Host != "" {
startupFnsV2 = append(startupFnsV2, elastic2.SetURL(uri.Scheme+"://"+uri.Host))
startupFnsV5 = append(startupFnsV5, elastic5.SetURL(uri.Scheme+"://"+uri.Host))
} else {
return nil, errors.New("There is no node assigned for connecting ES cluster")
}
// If the ES cluster needs authentication, the username and secret
// should be set in sink config.Else, set the Authenticate flag to false
if len(opts["esUserName"]) > 0 && len(opts["esUserSecret"]) > 0 {
startupFnsV2 = append(startupFnsV2, elastic2.SetBasicAuth(opts["esUserName"][0], opts["esUserSecret"][0]))
startupFnsV5 = append(startupFnsV5, elastic5.SetBasicAuth(opts["esUserName"][0], opts["esUserSecret"][0]))
}
if len(opts["maxRetries"]) > 0 {
maxRetries, err := strconv.Atoi(opts["maxRetries"][0])
if err != nil {
return nil, errors.New("Failed to parse URL's maxRetries value into an int")
}
startupFnsV2 = append(startupFnsV2, elastic2.SetMaxRetries(maxRetries))
startupFnsV5 = append(startupFnsV5, elastic5.SetMaxRetries(maxRetries))
}
if len(opts["healthCheck"]) > 0 {
healthCheck, err := strconv.ParseBool(opts["healthCheck"][0])
if err != nil {
return nil, errors.New("Failed to parse URL's healthCheck value into a bool")
}
startupFnsV2 = append(startupFnsV2, elastic2.SetHealthcheck(healthCheck))
startupFnsV5 = append(startupFnsV5, elastic5.SetHealthcheck(healthCheck))
}
if len(opts["startupHealthcheckTimeout"]) > 0 {
timeout, err := time.ParseDuration(opts["startupHealthcheckTimeout"][0] + "s")
if err != nil {
return nil, fmt.Errorf("Failed to parse URL's startupHealthcheckTimeout: %s", err.Error())
}
startupFnsV2 = append(startupFnsV2, elastic2.SetHealthcheckTimeoutStartup(timeout))
startupFnsV5 = append(startupFnsV5, elastic5.SetHealthcheckTimeoutStartup(timeout))
}
if os.Getenv("AWS_ACCESS_KEY_ID") != "" || os.Getenv("AWS_ACCESS_KEY") != "" ||
os.Getenv("AWS_SECRET_ACCESS_KEY") != "" || os.Getenv("AWS_SECRET_KEY") != "" {
glog.Info("Configuring with AWS credentials..")
awsClient, err := createAWSClient()
if err != nil {
return nil, err
}
startupFnsV2 = append(startupFnsV2, elastic2.SetHttpClient(awsClient), elastic2.SetSniff(false))
startupFnsV5 = append(startupFnsV5, elastic5.SetHttpClient(awsClient), elastic5.SetSniff(false))
} else {
if len(opts["sniff"]) > 0 {
sniff, err := strconv.ParseBool(opts["sniff"][0])
if err != nil {
return nil, errors.New("Failed to parse URL's sniff value into a bool")
}
startupFnsV2 = append(startupFnsV2, elastic2.SetSniff(sniff))
startupFnsV5 = append(startupFnsV5, elastic5.SetSniff(sniff))
}
}
bulkWorkers := 5
if len(opts["bulkWorkers"]) > 0 {
bulkWorkers, err = strconv.Atoi(opts["bulkWorkers"][0])
if err != nil {
return nil, errors.New("Failed to parse URL's bulkWorkers value into an int")
}
}
pipeline := ""
if len(opts["pipeline"]) > 0 {
pipeline = opts["pipeline"][0]
}
switch version {
case 2:
esSvc.EsClient, err = newEsClientV2(startupFnsV2, bulkWorkers)
case 5:
esSvc.EsClient, err = newEsClientV5(startupFnsV5, bulkWorkers, pipeline)
default:
return nil, UnsupportedVersion{}
}
if err != nil {
return nil, fmt.Errorf("Failed to create ElasticSearch client: %v", err)
}
glog.V(2).Infof("ElasticSearch sink configure successfully")
return &esSvc, nil
}