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elasticsearch.go
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elasticsearch.go
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// Copyright (c) 2018 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package writer
import (
"context"
"fmt"
"net/http"
"strings"
"time"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/types"
"github.com/Jeffail/benthos/lib/util/http/auth"
"github.com/Jeffail/benthos/lib/util/service/log"
"github.com/Jeffail/benthos/lib/util/text"
"github.com/olivere/elastic"
)
//------------------------------------------------------------------------------
// ElasticsearchConfig is configuration for the Elasticsearch output type.
type ElasticsearchConfig struct {
URLs []string `json:"urls" yaml:"urls"`
ID string `json:"id" yaml:"id"`
Index string `json:"index" yaml:"index"`
TimeoutMS int `json:"timeout_ms" yaml:"timeout_ms"`
Auth auth.BasicAuthConfig `json:"basic_auth" yaml:"basic_auth"`
}
// NewElasticsearchConfig creates a new ElasticsearchConfig with default values.
func NewElasticsearchConfig() ElasticsearchConfig {
return ElasticsearchConfig{
URLs: []string{"http://localhost:9200"},
ID: "${!count:elastic_ids}-${!timestamp_unix}",
Index: "benthos_index",
TimeoutMS: 5000,
Auth: auth.NewBasicAuthConfig(),
}
}
//------------------------------------------------------------------------------
// Elasticsearch is a writer type that writes messages into elasticsearch.
type Elasticsearch struct {
log log.Modular
stats metrics.Type
urls []string
conf ElasticsearchConfig
idBytes []byte
interpolateID bool
client *elastic.Client
}
// NewElasticsearch creates a new Elasticsearch writer type.
func NewElasticsearch(conf ElasticsearchConfig, log log.Modular, stats metrics.Type) (*Elasticsearch, error) {
idBytes := []byte(conf.ID)
interpolateID := text.ContainsFunctionVariables(idBytes)
e := Elasticsearch{
log: log.NewModule(".output.elasticsearch"),
stats: stats,
conf: conf,
idBytes: idBytes,
interpolateID: interpolateID,
}
for _, u := range conf.URLs {
for _, splitURL := range strings.Split(u, ",") {
if len(splitURL) > 0 {
e.urls = append(e.urls, splitURL)
}
}
}
return &e, nil
}
//------------------------------------------------------------------------------
// Connect attempts to establish a connection to a Elasticsearch broker.
func (e *Elasticsearch) Connect() error {
if e.client != nil {
return nil
}
opts := []elastic.ClientOptionFunc{
elastic.SetURL(e.urls...),
elastic.SetHttpClient(&http.Client{
Timeout: time.Duration(e.conf.TimeoutMS) * time.Millisecond,
}),
}
if e.conf.Auth.Enabled {
opts = append(opts, elastic.SetBasicAuth(
e.conf.Auth.Username, e.conf.Auth.Password,
))
}
var err error
if e.client, err = elastic.NewClient(opts...); err != nil {
return err
}
if err == nil {
var indexExists bool
indexExists, err = e.client.IndexExists(e.conf.Index).Do(context.Background())
if err == nil && !indexExists {
err = fmt.Errorf("index '%v' does not exist", e.conf.Index)
}
}
if err == nil {
e.log.Infof("Sending messages to Elasticsearch index at urls: %s\n", e.urls)
}
return err
}
// Write will attempt to write a message to Elasticsearch, wait for acknowledgement, and
// returns an error if applicable.
func (e *Elasticsearch) Write(msg types.Message) error {
if e.client == nil {
return types.ErrNotConnected
}
return msg.Iter(func(i int, part []byte) error {
id := e.idBytes
if e.interpolateID {
id = text.ReplaceFunctionVariables(id)
}
_, err := e.client.Index().
Index(e.conf.Index).
Type("doc").
Id(string(id)).
BodyString(string(part)).
Do(context.Background())
return err
})
}
// CloseAsync shuts down the Elasticsearch writer and stops processing messages.
func (e *Elasticsearch) CloseAsync() {
}
// WaitForClose blocks until the Elasticsearch writer has closed down.
func (e *Elasticsearch) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------