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Signed-off-by: huanggze <loganhuang@yunify.com>
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# go-elasticsearch
The official Go client for [Elasticsearch](https://www.elastic.co/products/elasticsearch).
[![GoDoc](https://godoc.org/github.com/elastic/go-elasticsearch?status.svg)](http://godoc.org/github.com/elastic/go-elasticsearch)
[![Travis-CI](https://travis-ci.org/elastic/go-elasticsearch.svg?branch=master)](https://travis-ci.org/elastic/go-elasticsearch)
[![Go Report Card](https://goreportcard.com/badge/github.com/elastic/go-elasticsearch)](https://goreportcard.com/report/github.com/elastic/go-elasticsearch)
[![codecov.io](https://codecov.io/github/elastic/go-elasticsearch/coverage.svg?branch=master)](https://codecov.io/gh/elastic/go-elasticsearch?branch=master)
## Compatibility
The client major versions correspond to the compatible Elasticsearch major versions: to connect to Elasticsearch `7.x`, use a [`7.x`](https://github.com/elastic/go-elasticsearch/tree/7.x) version of the client, to connect to Elasticsearch `6.x`, use a [`6.x`](https://github.com/elastic/go-elasticsearch/tree/6.x) version of the client.
When using Go modules, include the version in the import path, and specify either an explicit version or a branch:
require github.com/elastic/go-elasticsearch/v7 7.x
require github.com/elastic/go-elasticsearch/v7 7.0.0
It's possible to use multiple versions of the client in a single project:
// go.mod
github.com/elastic/go-elasticsearch/v6 6.x
github.com/elastic/go-elasticsearch/v7 7.x
// main.go
import (
elasticsearch6 "github.com/elastic/go-elasticsearch/v6"
elasticsearch7 "github.com/elastic/go-elasticsearch/v7"
)
// ...
es6, _ := elasticsearch6.NewDefaultClient()
es7, _ := elasticsearch7.NewDefaultClient()
The `master` branch of the client is compatible with the current `master` branch of Elasticsearch.
<!-- ----------------------------------------------------------------------------------------------- -->
## Installation
Add the package to your `go.mod` file:
require github.com/elastic/go-elasticsearch/v5 5.x
Or, clone the repository:
git clone --branch 5.x https://github.com/elastic/go-elasticsearch.git $GOPATH/src/github.com/elastic/go-elasticsearch
A complete example:
```bash
mkdir my-elasticsearch-app && cd my-elasticsearch-app
cat > go.mod <<-END
module my-elasticsearch-app
require github.com/elastic/go-elasticsearch/v5 5.x
END
cat > main.go <<-END
package main
import (
"log"
"github.com/elastic/go-elasticsearch/v5"
)
func main() {
es, _ := elasticsearch.NewDefaultClient()
log.Println(elasticsearch.Version)
log.Println(es.Info())
}
END
go run main.go
```
<!-- ----------------------------------------------------------------------------------------------- -->
## Usage
The `elasticsearch` package ties together two separate packages for calling the Elasticsearch APIs and transferring data over HTTP: `esapi` and `estransport`, respectively.
Use the `elasticsearch.NewDefaultClient()` function to create the client with the default settings.
```golang
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)
// [200 OK] {
// "name" : "node-1",
// "cluster_name" : "go-elasticsearch"
// ...
```
When you export the `ELASTICSEARCH_URL` environment variable,
it will be used to set the cluster endpoint(s). Separate multiple adresses by a comma.
To set the cluster endpoint(s) programatically, pass them in the configuration object
to the `elasticsearch.NewClient()` function.
```golang
cfg := elasticsearch.Config{
Addresses: []string{
"http://localhost:9200",
"http://localhost:9201",
},
}
es, err := elasticsearch.NewClient(cfg)
// ...
```
To configure the HTTP settings, pass a [`http.Transport`](https://golang.org/pkg/net/http/#Transport)
object in the configuration object (the values are for illustrative purposes only).
```golang
cfg := elasticsearch.Config{
Transport: &http.Transport{
MaxIdleConnsPerHost: 10,
ResponseHeaderTimeout: time.Second,
DialContext: (&net.Dialer{Timeout: time.Second}).DialContext,
TLSClientConfig: &tls.Config{
MinVersion: tls.VersionTLS11,
// ...
},
},
}
es, err := elasticsearch.NewClient(cfg)
// ...
```
See the [`_examples/configuration.go`](_examples/configuration.go) and
[`_examples/customization.go`](_examples/customization.go) files for
more examples of configuration and customization of the client.
The following example demonstrates a more complex usage. It fetches the Elasticsearch version from the cluster, indexes a couple of documents concurrently, and prints the search results, using a lightweight wrapper around the response body.
```golang
// $ go run _examples/main.go
package main
import (
"bytes"
"context"
"encoding/json"
"log"
"strconv"
"strings"
"sync"
"github.com/elastic/go-elasticsearch/v5"
"github.com/elastic/go-elasticsearch/v5/esapi"
)
func main() {
log.SetFlags(0)
var (
r map[string]interface{}
wg sync.WaitGroup
)
// Initialize a client with the default settings.
//
// An `ELASTICSEARCH_URL` environment variable will be used when exported.
//
es, err := elasticsearch.NewDefaultClient()
if err != nil {
log.Fatalf("Error creating the client: %s", err)
}
// 1. Get cluster info
//
res, err := es.Info()
if err != nil {
log.Fatalf("Error getting response: %s", err)
}
// Check response status
if res.IsError() {
log.Fatalf("Error: %s", res.String())
}
// Deserialize the response into a map.
if err := json.NewDecoder(res.Body).Decode(&r); err != nil {
log.Fatalf("Error parsing the response body: %s", err)
}
// Print client and server version numbers.
log.Printf("Client: %s", elasticsearch.Version)
log.Printf("Server: %s", r["version"].(map[string]interface{})["number"])
log.Println(strings.Repeat("~", 37))
// 2. Index documents concurrently
//
for i, title := range []string{"Test One", "Test Two"} {
wg.Add(1)
go func(i int, title string) {
defer wg.Done()
// Build the request body.
var b strings.Builder
b.WriteString(`{"title" : "`)
b.WriteString(title)
b.WriteString(`"}`)
// Set up the request object.
req := esapi.IndexRequest{
Index: "test",
DocumentType: "test",
DocumentID: strconv.Itoa(i + 1),
Body: strings.NewReader(b.String()),
Refresh: "true",
}
// Perform the request with the client.
res, err := req.Do(context.Background(), es)
if err != nil {
log.Fatalf("Error getting response: %s", err)
}
defer res.Body.Close()
if res.IsError() {
log.Printf("[%s] Error indexing document ID=%d", res.Status(), i+1)
} else {
// Deserialize the response into a map.
var r map[string]interface{}
if err := json.NewDecoder(res.Body).Decode(&r); err != nil {
log.Printf("Error parsing the response body: %s", err)
} else {
// Print the response status and indexed document version.
log.Printf("[%s] %s; version=%d", res.Status(), r["result"], int(r["_version"].(float64)))
}
}
}(i, title)
}
wg.Wait()
log.Println(strings.Repeat("-", 37))
// 3. Search for the indexed documents
//
// Build the request body.
var buf bytes.Buffer
query := map[string]interface{}{
"query": map[string]interface{}{
"match": map[string]interface{}{
"title": "test",
},
},
}
if err := json.NewEncoder(&buf).Encode(query); err != nil {
log.Fatalf("Error encoding query: %s", err)
}
// Perform the search request.
res, err = es.Search(
es.Search.WithContext(context.Background()),
es.Search.WithIndex("test"),
es.Search.WithBody(&buf),
es.Search.WithPretty(),
)
if err != nil {
log.Fatalf("Error getting response: %s", err)
}
defer res.Body.Close()
if res.IsError() {
var e map[string]interface{}
if err := json.NewDecoder(res.Body).Decode(&e); err != nil {
log.Fatalf("Error parsing the response body: %s", err)
} else {
// Print the response status and error information.
log.Fatalf("[%s] %s: %s",
res.Status(),
e["error"].(map[string]interface{})["type"],
e["error"].(map[string]interface{})["reason"],
)
}
}
if err := json.NewDecoder(res.Body).Decode(&r); err != nil {
log.Fatalf("Error parsing the response body: %s", err)
}
// Print the response status, number of results, and request duration.
log.Printf(
"[%s] %d hits; took: %dms",
res.Status(),
int(r["hits"].(map[string]interface{})["total"].(float64)),
int(r["took"].(float64)),
)
// Print the ID and document source for each hit.
for _, hit := range r["hits"].(map[string]interface{})["hits"].([]interface{}) {
log.Printf(" * ID=%s, %s", hit.(map[string]interface{})["_id"], hit.(map[string]interface{})["_source"])
}
log.Println(strings.Repeat("=", 37))
}
// Client: 5.6.0-SNAPSHOT
// Server: 5.6.15
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// [201 Created] updated; version=1
// [201 Created] updated; version=1
// -------------------------------------
// [200 OK] 2 hits; took: 5ms
// * ID=1, map[title:Test One]
// * ID=2, map[title:Test Two]
// =====================================
```
As you see in the example above, the `esapi` package allows to call the Elasticsearch APIs in two distinct ways: either by creating a struct, such as `IndexRequest`, and calling its `Do()` method by passing it a context and the client, or by calling the `Search()` function on the client directly, using the option functions such as `WithIndex()`. See more information and examples in the
[package documentation](https://godoc.org/github.com/elastic/go-elasticsearch/esapi).
The `estransport` package handles the transfer of data to and from Elasticsearch. At the moment, the implementation is really minimal: it only round-robins across the configured cluster endpoints. In future, more features — retrying failed requests, ignoring certain status codes, auto-discovering nodes in the cluster, and so on — will be added.
<!-- ----------------------------------------------------------------------------------------------- -->
## Helpers
The `esutil` package provides convenience helpers for working with the client. At the moment, it provides the
`esutil.JSONReader()` helper function.
<!-- ----------------------------------------------------------------------------------------------- -->
## Examples
The **[`_examples`](./_examples)** folder contains a number of recipes and comprehensive examples to get you started with the client, including configuration and customization of the client, mocking the transport for unit tests, embedding the client in a custom type, building queries, performing requests, and parsing the responses.
<!-- ----------------------------------------------------------------------------------------------- -->
## License
(c) 2019 Elasticsearch. Licensed under the Apache License, Version 2.0.