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// Copyright 2012-present Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
import (
"bytes"
"context"
"errors"
"fmt"
"net/url"
"gopkg.in/olivere/elastic.v5/uritemplates"
)
// BulkService allows for batching bulk requests and sending them to
// Elasticsearch in one roundtrip. Use the Add method with BulkIndexRequest,
// BulkUpdateRequest, and BulkDeleteRequest to add bulk requests to a batch,
// then use Do to send them to Elasticsearch.
//
// BulkService will be reset after each Do call. In other words, you can
// reuse BulkService to send many batches. You do not have to create a new
// BulkService for each batch.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/docs-bulk.html
// for more details.
type BulkService struct {
client *Client
retrier Retrier
index string
typ string
requests []BulkableRequest
pipeline string
timeout string
refresh string
routing string
waitForActiveShards string
pretty bool
// estimated bulk size in bytes, up to the request index sizeInBytesCursor
sizeInBytes int64
sizeInBytesCursor int
}
// NewBulkService initializes a new BulkService.
func NewBulkService(client *Client) *BulkService {
builder := &BulkService{
client: client,
}
return builder
}
// Reset cleans up the request queue
func (s *BulkService) Reset() {
s.requests = make([]BulkableRequest, 0)
s.sizeInBytes = 0
s.sizeInBytesCursor = 0
}
// Retrier allows to set specific retry logic for this BulkService.
// If not specified, it will use the client's default retrier.
func (s *BulkService) Retrier(retrier Retrier) *BulkService {
s.retrier = retrier
return s
}
// Index specifies the index to use for all batches. You may also leave
// this blank and specify the index in the individual bulk requests.
func (s *BulkService) Index(index string) *BulkService {
s.index = index
return s
}
// Type specifies the type to use for all batches. You may also leave
// this blank and specify the type in the individual bulk requests.
func (s *BulkService) Type(typ string) *BulkService {
s.typ = typ
return s
}
// Timeout is a global timeout for processing bulk requests. This is a
// server-side timeout, i.e. it tells Elasticsearch the time after which
// it should stop processing.
func (s *BulkService) Timeout(timeout string) *BulkService {
s.timeout = timeout
return s
}
// Refresh controls when changes made by this request are made visible
// to search. The allowed values are: "true" (refresh the relevant
// primary and replica shards immediately), "wait_for" (wait for the
// changes to be made visible by a refresh before applying), or "false"
// (no refresh related actions).
func (s *BulkService) Refresh(refresh string) *BulkService {
s.refresh = refresh
return s
}
// Routing specifies the routing value.
func (s *BulkService) Routing(routing string) *BulkService {
s.routing = routing
return s
}
// Pipeline specifies the pipeline id to preprocess incoming documents with.
func (s *BulkService) Pipeline(pipeline string) *BulkService {
s.pipeline = pipeline
return s
}
// WaitForActiveShards sets the number of shard copies that must be active
// before proceeding with the bulk operation. Defaults to 1, meaning the
// primary shard only. Set to `all` for all shard copies, otherwise set to
// any non-negative value less than or equal to the total number of copies
// for the shard (number of replicas + 1).
func (s *BulkService) WaitForActiveShards(waitForActiveShards string) *BulkService {
s.waitForActiveShards = waitForActiveShards
return s
}
// Pretty tells Elasticsearch whether to return a formatted JSON response.
func (s *BulkService) Pretty(pretty bool) *BulkService {
s.pretty = pretty
return s
}
// Add adds bulkable requests, i.e. BulkIndexRequest, BulkUpdateRequest,
// and/or BulkDeleteRequest.
func (s *BulkService) Add(requests ...BulkableRequest) *BulkService {
for _, r := range requests {
s.requests = append(s.requests, r)
}
return s
}
// EstimatedSizeInBytes returns the estimated size of all bulkable
// requests added via Add.
func (s *BulkService) EstimatedSizeInBytes() int64 {
if s.sizeInBytesCursor == len(s.requests) {
return s.sizeInBytes
}
for _, r := range s.requests[s.sizeInBytesCursor:] {
s.sizeInBytes += s.estimateSizeInBytes(r)
s.sizeInBytesCursor++
}
return s.sizeInBytes
}
// estimateSizeInBytes returns the estimates size of the given
// bulkable request, i.e. BulkIndexRequest, BulkUpdateRequest, and
// BulkDeleteRequest.
func (s *BulkService) estimateSizeInBytes(r BulkableRequest) int64 {
lines, _ := r.Source()
size := 0
for _, line := range lines {
// +1 for the \n
size += len(line) + 1
}
return int64(size)
}
// NumberOfActions returns the number of bulkable requests that need to
// be sent to Elasticsearch on the next batch.
func (s *BulkService) NumberOfActions() int {
return len(s.requests)
}
func (s *BulkService) bodyAsString() (string, error) {
// Pre-allocate to reduce allocs
buf := bytes.NewBuffer(make([]byte, 0, s.EstimatedSizeInBytes()))
for _, req := range s.requests {
source, err := req.Source()
if err != nil {
return "", err
}
for _, line := range source {
buf.WriteString(line)
buf.WriteByte('\n')
}
}
return buf.String(), nil
}
// Do sends the batched requests to Elasticsearch. Note that, when successful,
// you can reuse the BulkService for the next batch as the list of bulk
// requests is cleared on success.
func (s *BulkService) Do(ctx context.Context) (*BulkResponse, error) {
// No actions?
if s.NumberOfActions() == 0 {
return nil, errors.New("elastic: No bulk actions to commit")
}
// Get body
body, err := s.bodyAsString()
if err != nil {
return nil, err
}
// Build url
path := "/"
if len(s.index) > 0 {
index, err := uritemplates.Expand("{index}", map[string]string{
"index": s.index,
})
if err != nil {
return nil, err
}
path += index + "/"
}
if len(s.typ) > 0 {
typ, err := uritemplates.Expand("{type}", map[string]string{
"type": s.typ,
})
if err != nil {
return nil, err
}
path += typ + "/"
}
path += "_bulk"
// Parameters
params := make(url.Values)
if s.pretty {
params.Set("pretty", fmt.Sprintf("%v", s.pretty))
}
if s.pipeline != "" {
params.Set("pipeline", s.pipeline)
}
if s.refresh != "" {
params.Set("refresh", s.refresh)
}
if s.routing != "" {
params.Set("routing", s.routing)
}
if s.timeout != "" {
params.Set("timeout", s.timeout)
}
if s.waitForActiveShards != "" {
params.Set("wait_for_active_shards", s.waitForActiveShards)
}
// Get response
res, err := s.client.PerformRequestWithOptions(ctx, PerformRequestOptions{
Method: "POST",
Path: path,
Params: params,
Body: body,
ContentType: "application/x-ndjson",
Retrier: s.retrier,
})
if err != nil {
return nil, err
}
// Return results
ret := new(BulkResponse)
if err := s.client.decoder.Decode(res.Body, ret); err != nil {
return nil, err
}
// Reset so the request can be reused
s.Reset()
return ret, nil
}
// BulkResponse is a response to a bulk execution.
//
// Example:
// {
// "took":3,
// "errors":false,
// "items":[{
// "index":{
// "_index":"index1",
// "_type":"tweet",
// "_id":"1",
// "_version":3,
// "status":201
// }
// },{
// "index":{
// "_index":"index2",
// "_type":"tweet",
// "_id":"2",
// "_version":3,
// "status":200
// }
// },{
// "delete":{
// "_index":"index1",
// "_type":"tweet",
// "_id":"1",
// "_version":4,
// "status":200,
// "found":true
// }
// },{
// "update":{
// "_index":"index2",
// "_type":"tweet",
// "_id":"2",
// "_version":4,
// "status":200
// }
// }]
// }
type BulkResponse struct {
Took int `json:"took,omitempty"`
Errors bool `json:"errors,omitempty"`
Items []map[string]*BulkResponseItem `json:"items,omitempty"`
}
// BulkResponseItem is the result of a single bulk request.
type BulkResponseItem struct {
Index string `json:"_index,omitempty"`
Type string `json:"_type,omitempty"`
Id string `json:"_id,omitempty"`
Version int64 `json:"_version,omitempty"`
Status int `json:"status,omitempty"`
Result string `json:"result,omitempty"`
ForcedRefresh bool `json:"forced_refresh,omitempty"`
Found bool `json:"found,omitempty"`
Error *ErrorDetails `json:"error,omitempty"`
GetResult *GetResult `json:"get,omitempty"`
}
// Indexed returns all bulk request results of "index" actions.
func (r *BulkResponse) Indexed() []*BulkResponseItem {
return r.ByAction("index")
}
// Created returns all bulk request results of "create" actions.
func (r *BulkResponse) Created() []*BulkResponseItem {
return r.ByAction("create")
}
// Updated returns all bulk request results of "update" actions.
func (r *BulkResponse) Updated() []*BulkResponseItem {
return r.ByAction("update")
}
// Deleted returns all bulk request results of "delete" actions.
func (r *BulkResponse) Deleted() []*BulkResponseItem {
return r.ByAction("delete")
}
// ByAction returns all bulk request results of a certain action,
// e.g. "index" or "delete".
func (r *BulkResponse) ByAction(action string) []*BulkResponseItem {
if r.Items == nil {
return nil
}
var items []*BulkResponseItem
for _, item := range r.Items {
if result, found := item[action]; found {
items = append(items, result)
}
}
return items
}
// ById returns all bulk request results of a given document id,
// regardless of the action ("index", "delete" etc.).
func (r *BulkResponse) ById(id string) []*BulkResponseItem {
if r.Items == nil {
return nil
}
var items []*BulkResponseItem
for _, item := range r.Items {
for _, result := range item {
if result.Id == id {
items = append(items, result)
}
}
}
return items
}
// Failed returns those items of a bulk response that have errors,
// i.e. those that don't have a status code between 200 and 299.
func (r *BulkResponse) Failed() []*BulkResponseItem {
if r.Items == nil {
return nil
}
var errors []*BulkResponseItem
for _, item := range r.Items {
for _, result := range item {
if !(result.Status >= 200 && result.Status <= 299) {
errors = append(errors, result)
}
}
}
return errors
}
// Succeeded returns those items of a bulk response that have no errors,
// i.e. those have a status code between 200 and 299.
func (r *BulkResponse) Succeeded() []*BulkResponseItem {
if r.Items == nil {
return nil
}
var succeeded []*BulkResponseItem
for _, item := range r.Items {
for _, result := range item {
if result.Status >= 200 && result.Status <= 299 {
succeeded = append(succeeded, result)
}
}
}
return succeeded
}
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