go-elasticsearch
安装go-elasticsearch包
go get -u github.com/elastic/go-elasticsearch
elasticsearch 包将两个单独的包联系在一起:esapi 和 estransport,分别用于调用 Elasticsearch API 和通过 HTTP 传输数据
简单示例:
import ( "github.com/elastic/go-elasticsearch/v7" "log" ) func main() { // 默认连接地址:http://localhost:9200 es, err := elasticsearch.NewDefaultClient() if err != nil { log.Fatalf("Error creating the client: %s", err) } res, err := es.Info() if err != nil { log.Fatalf("Error getting response: %s", err) } log.Println(res) }
连接并查询示例:
import ( "context" "encoding/json" "github.com/elastic/go-elasticsearch/v7" "log" "strings" ) func main() { // es连接配置 cfg := elasticsearch.Config{ Addresses: []string{ "http://localhost:9200", }, Username: "elastic", Password: "XcF8EbPPmgRgiLqoVAcI", } es, err := elasticsearch.NewClient(cfg) if err != nil { log.Fatalf("Error creating the client: %s", err) } // 搜索 res, err := es.Search(es.Search.WithContext(context.Background()), es.Search.WithIndex("megacorp"), es.Search.WithBody(strings.NewReader(`{"query" : { "match" : { "last_name" : "Smith" } }}`)), es.Search.WithTrackTotalHits(true), es.Search.WithPretty(), ) if err != nil { log.Fatalf("ERROR: %s", err) } // 反序列化结果到map中 var result map[string]interface{} if err := json.NewDecoder(res.Body).Decode(&result); err != nil { log.Fatalf("Error parsing the response body: %s", err) } // Print the ID and document source for each hit. for _, hit := range result["hits"].(map[string]interface{})["hits"].([]interface{}) { log.Printf(" * ID=%s, %s", hit.(map[string]interface{})["_id"], hit.(map[string]interface{})["_source"]) } log.Println(result) defer res.Body.Close() }
bulk
go elasticsearch bulk 操作:
res, err := es.Bulk(
strings.NewReader(`
{ "index" : { "_index" : "test", "_id" : "1" } }
{ "field1" : "value1" }
{ "delete" : { "_index" : "test", "_id" : "2" } }
{ "create" : { "_index" : "test", "_id" : "3" } }
{ "field1" : "value3" }
{ "update" : {"_id" : "1", "_index" : "test"} }
{ "doc" : {"field2" : "value2"} }
`),
)
fmt.Println(res, err)
附录:
Elasticsearch Go Client:https://www.elastic.co/guide/en/elasticsearch/client/go-api/current/index.html
Go 官方文档:https://pkg.go.dev/github.com/elastic/go-elasticsearch
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