【go】【Elasticsearch】

@

目錄

• • 寫在前面
  • [install]
  • [connection]
• [low-level]
  • index
    • [create index]
    • [update index]
    • [indexing documents]
    • [delete index]
  • document
    • [insert documents]
    • [search documents]
    • [update document]
    • [delete document]
• [full-type]
  • • [connection]
    • [common]
  • index
    • [create index]
    • [delete index]
    • [update index]
    • [get index]
  • document
    • [indexing documents]
    • [get document]
    • [search documents]
    • [update document]
    • [delete document]
  • 參考資料
    • 基礎/標準庫/第三方庫
    • golang 導航
    • 程式設計規範
    • 演算法｜面試
    • 專案

---

寫在前面

• 相關博文
• 個人部落格首頁
• 免責宣告：僅供學習交流使用！開源框架可能存在的風險和相關後果將完全由使用者自行承擔，本人不承擔任何法律責任。

---

[install]

https://www.elastic.co/guide/en/elasticsearch/client/go-api/current/getting-started-go.html#_installation

go get github.com/elastic/go-elasticsearch/v8@latest

[connection]

• elastic cloud

client, err := elasticsearch.NewClient(elasticsearch.Config{
    CloudID: "<CloudID>",
    APIKey: "<ApiKey>",
})

• base authentication

cfg := elasticsearch.Config{
  Addresses: []string{
    "https://localhost:9200",
    "https://localhost:9201",
  },
  Username: "foo",
  Password: "bar",
}

• ca cert

cert, _ := os.ReadFile("/path/to/http_ca.crt")

cfg := elasticsearch.Config{
        Addresses: []string{
            "https://localhost:9200",
        },
        Username: "elastic",
        Password: ELASTIC_PASSWORD
        CACert:   cert
}
es, err := elasticsearch.NewClient(cfg)

[low-level]

https://www.elastic.co/guide/en/elasticsearch/client/go-api/current/getting-started-go.html

es, err := elasticsearch.NewClient(cfg)

index

[create index]

client.Indices.Create("test")

[update index]

client.Indices.PutSettings(strings.NewReader(`{  "settings": {  "number_of_replicas": 3   }}`))

[indexing documents]

client.Indices.Delete([]string{"test"})

[delete index]

client.Indices.Delete([]string{"test"})

document

[insert documents]

document := struct {
    Name string `json:"name"`
}{
    "go-elasticsearch",
}
data, _ := json.Marshal(document)
client.Index("my_index", bytes.NewReader(data))

[search documents]

s := client.API.Search.WithIndex("test")
q := client.API.Search.WithQuery("info=info")
client.Search(s, q)

[update document]

client.Update("test", UUID, strings.NewReader(`{"doc":{ "id":111, "name": "Go", "info":"info"} }`))

[delete document]

client.Delete("test", UUID)

[full-type]

https://www.elastic.co/guide/en/elasticsearch/client/go-api/current/getting-started-go.html

[connection]

typedClient, err := elasticsearch.NewTypedClient(elasticsearch.Config{})

[common]

type User struct {
	Id   int    `json:"id"`
	Name string `json:"name"`
	Age  int    `json:"age"`
}
type EsResponse struct {
	Id     string `json:"_id"`
	Result string `json:"result"`
}

index

[create index]

typedClient.Indices.Create("my_index").Do(context.TODO())

[delete index]

typedClient.Indices.Delete("my_index").Do(context.TODO())

[update index]

typedClient.Indices.PutSettings().Indices("typed").NumberOfReplicas("3").Do(context.TODO())

[get index]

typedClient.GetSettings().Index("typed").Do(context.TODO())

document

[indexing documents]

document := struct {
    Name string `json:"name"`
}{
    "go-elasticsearch",
}
typedClient.Index("my_index").
		Id("1").
		Request(document).
		Do(context.TODO())
---


*user := User{1, "name1", 11}*
*typedClient.Index("typed").Request(user).Do(context.TODO())*

[get document]

typedClient.Get("my_index", "id").Do(context.TODO())

[search documents]

typedClient.Search().
    Index("my_index").
    Request(&search.Request{
        Query: &types.Query{MatchAll: &types.MatchAllQuery{}},
    }).
    Do(context.TODO())

*typedClient.Search().Index("typed").Query(&types.Query{QueryString: &types.QueryStringQuery{Query: "3"}}).Do(context.TODO())*

[update document]

typedClient.Update("my_index", "id").
	Request(&update.Request{
        Doc: json.RawMessage(`{ language: "Go" }`),
    }).Do(context.TODO())

 
*user := User{2, "name1", 11}*
*typedClient.Update("typed", UUID).Doc(user).Do(context.TODO())*

[delete document]

typedClient.Delete("my_index", "id").Do(context.TODO())

---

參考資料

基礎/標準庫/第三方庫

---

• 地鼠文件：比較多資料
• topgoer
• go awesome
• golang 文件學習
• golang 標準庫
• go 檔案常用操作

golang 導航

---

• golang 收集
• go-guide
• golang 導航
• go-concurrency-guide
• go-advice
• golang 知識路線

程式設計規範

---

• golang 程式設計規範
• golang 規範示例

演算法｜面試

---

• cs 面試
• 面試網站
• Golang後端研發崗位相關面試題和簡歷
• 路人張的面試筆記
• golang 演算法

專案

---

• golang 專案推薦
• 7天系列
• go專案推薦
• go高效能程式設計