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bulkapi.go
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bulkapi.go
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package elasticsearch
import (
"bytes"
"encoding/json"
"github.com/elastic/beats/libbeat/logp"
)
// MetaBuilder creates meta data for bulk requests
type MetaBuilder func(interface{}) interface{}
type bulkRequest struct {
es *Connection
buf bytes.Buffer
enc *json.Encoder
path string
params map[string]string
}
type bulkMeta struct {
Index bulkMetaIndex `json:"index"`
}
type bulkMetaIndex struct {
Index string `json:"_index"`
DocType string `json:"_type"`
}
type BulkResult struct {
Items []json.RawMessage `json:"items"`
}
func (r *bulkRequest) Send(meta, obj interface{}) error {
var err error
pos := r.buf.Len()
if err = r.enc.Encode(meta); err != nil {
return err
}
if err = r.enc.Encode(obj); err != nil {
r.buf.Truncate(pos) // remove meta object from buffer
}
return err
}
func (r *bulkRequest) Flush() (int, *BulkResult, error) {
if r.buf.Len() == 0 {
logp.Debug("elasticsearch", "Empty channel. Wait for more data.")
return 0, nil, nil
}
status, resp, err := r.es.sendBulkRequest("POST", r.path, r.params, &r.buf)
if err != nil {
return status, nil, err
}
r.buf.Truncate(0)
result, err := readBulkResult(resp)
return status, result, err
}
// Bulk performs many index/delete operations in a single API call.
// Implements: http://www.elastic.co/guide/en/elasticsearch/reference/current/docs-bulk.html
func (conn *Connection) Bulk(
index, docType string,
params map[string]string, body []interface{},
) (*QueryResult, error) {
return conn.BulkWith(index, docType, params, nil, body)
}
// BulkWith creates a HTTP request containing a bunch of operations and send
// them to Elasticsearch. The request is retransmitted up to max_retries before
// returning an error.
func (conn *Connection) BulkWith(
index string,
docType string,
params map[string]string,
metaBuilder MetaBuilder,
body []interface{},
) (*QueryResult, error) {
if len(body) == 0 {
logp.Debug("elasticsearch", "Empty channel. Wait for more data.")
return nil, nil
}
path, err := makePath(index, docType, "_bulk")
if err != nil {
return nil, err
}
buf := bulkEncode(metaBuilder, body)
if buf.Len() == 0 {
logp.Debug("elasticsearch", "Empty channel. Wait for more data.")
return nil, nil
}
_, resp, err := conn.sendBulkRequest("POST", path, params, &buf)
if err != nil {
return nil, err
}
return readQueryResult(resp)
}
func (conn *Connection) startBulkRequest(
index string,
docType string,
params map[string]string,
) (*bulkRequest, error) {
path, err := makePath(index, docType, "_bulk")
if err != nil {
return nil, err
}
r := &bulkRequest{
es: conn,
path: path,
params: params,
}
r.enc = json.NewEncoder(&r.buf)
return r, nil
}
func (conn *Connection) sendBulkRequest(
method, path string,
params map[string]string,
buf *bytes.Buffer,
) (int, []byte, error) {
url := makeURL(conn.URL, path, params)
logp.Debug("elasticsearch", "Sending bulk request to %s", url)
return conn.execRequest(method, url, buf)
}
func bulkEncode(metaBuilder MetaBuilder, body []interface{}) bytes.Buffer {
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
if metaBuilder == nil {
for _, obj := range body {
pos := buf.Len()
if err := enc.Encode(obj); err != nil {
debug("Failed to encode message: %s", err)
buf.Truncate(pos)
}
}
} else {
for _, obj := range body {
pos := buf.Len()
meta := metaBuilder(obj)
err := enc.Encode(meta)
if err == nil {
err = enc.Encode(obj)
}
if err != nil {
debug("Failed to encode message: %s", err)
buf.Truncate(pos)
}
}
}
return buf
}
func readBulkResult(obj []byte) (*BulkResult, error) {
if obj == nil {
return nil, nil
}
var result BulkResult
err := json.Unmarshal(obj, &result)
if err != nil {
return nil, err
}
return &result, nil
}