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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 (
"fmt"
"net/url"
"strings"
"golang.org/x/net/context"
)
// MgetService allows to get multiple documents based on an index,
// type (optional) and id (possibly routing). The response includes
// a docs array with all the fetched documents, each element similar
// in structure to a document provided by the Get API.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/5.2/docs-multi-get.html
// for details.
type MgetService struct {
client *Client
pretty bool
preference string
realtime *bool
refresh string
routing string
storedFields []string
items []*MultiGetItem
}
// NewMgetService initializes a new Multi GET API request call.
func NewMgetService(client *Client) *MgetService {
builder := &MgetService{
client: client,
}
return builder
}
// Preference specifies the node or shard the operation should be performed
// on (default: random).
func (s *MgetService) Preference(preference string) *MgetService {
s.preference = preference
return s
}
// Refresh the shard containing the document before performing the operation.
func (s *MgetService) Refresh(refresh string) *MgetService {
s.refresh = refresh
return s
}
// Realtime specifies whether to perform the operation in realtime or search mode.
func (s *MgetService) Realtime(realtime bool) *MgetService {
s.realtime = &realtime
return s
}
// Routing is the specific routing value.
func (s *MgetService) Routing(routing string) *MgetService {
s.routing = routing
return s
}
// StoredFields is a list of fields to return in the response.
func (s *MgetService) StoredFields(storedFields ...string) *MgetService {
s.storedFields = append(s.storedFields, storedFields...)
return s
}
// Pretty indicates that the JSON response be indented and human readable.
func (s *MgetService) Pretty(pretty bool) *MgetService {
s.pretty = pretty
return s
}
// Add an item to the request.
func (s *MgetService) Add(items ...*MultiGetItem) *MgetService {
s.items = append(s.items, items...)
return s
}
// Source returns the request body, which will be serialized into JSON.
func (s *MgetService) Source() (interface{}, error) {
source := make(map[string]interface{})
items := make([]interface{}, len(s.items))
for i, item := range s.items {
src, err := item.Source()
if err != nil {
return nil, err
}
items[i] = src
}
source["docs"] = items
return source, nil
}
// Do executes the request.
func (s *MgetService) Do(ctx context.Context) (*MgetResponse, error) {
// Build url
path := "/_mget"
params := make(url.Values)
if s.realtime != nil {
params.Add("realtime", fmt.Sprintf("%v", *s.realtime))
}
if s.preference != "" {
params.Add("preference", s.preference)
}
if s.refresh != "" {
params.Add("refresh", s.refresh)
}
if s.routing != "" {
params.Set("routing", s.routing)
}
if len(s.storedFields) > 0 {
params.Set("stored_fields", strings.Join(s.storedFields, ","))
}
// Set body
body, err := s.Source()
if err != nil {
return nil, err
}
// Get response
res, err := s.client.PerformRequest(ctx, "GET", path, params, body)
if err != nil {
return nil, err
}
// Return result
ret := new(MgetResponse)
if err := s.client.decoder.Decode(res.Body, ret); err != nil {
return nil, err
}
return ret, nil
}
// -- Multi Get Item --
// MultiGetItem is a single document to retrieve via the MgetService.
type MultiGetItem struct {
index string
typ string
id string
routing string
storedFields []string
version *int64 // see org.elasticsearch.common.lucene.uid.Versions
versionType string // see org.elasticsearch.index.VersionType
fsc *FetchSourceContext
}
// NewMultiGetItem initializes a new, single item for a Multi GET request.
func NewMultiGetItem() *MultiGetItem {
return &MultiGetItem{}
}
// Index specifies the index name.
func (item *MultiGetItem) Index(index string) *MultiGetItem {
item.index = index
return item
}
// Type specifies the type name.
func (item *MultiGetItem) Type(typ string) *MultiGetItem {
item.typ = typ
return item
}
// Id specifies the identifier of the document.
func (item *MultiGetItem) Id(id string) *MultiGetItem {
item.id = id
return item
}
// Routing is the specific routing value.
func (item *MultiGetItem) Routing(routing string) *MultiGetItem {
item.routing = routing
return item
}
// StoredFields is a list of fields to return in the response.
func (item *MultiGetItem) StoredFields(storedFields ...string) *MultiGetItem {
item.storedFields = append(item.storedFields, storedFields...)
return item
}
// Version can be MatchAny (-3), MatchAnyPre120 (0), NotFound (-1),
// or NotSet (-2). These are specified in org.elasticsearch.common.lucene.uid.Versions.
// The default in Elasticsearch is MatchAny (-3).
func (item *MultiGetItem) Version(version int64) *MultiGetItem {
item.version = &version
return item
}
// VersionType can be "internal", "external", "external_gt", "external_gte",
// or "force". See org.elasticsearch.index.VersionType in Elasticsearch source.
// It is "internal" by default.
func (item *MultiGetItem) VersionType(versionType string) *MultiGetItem {
item.versionType = versionType
return item
}
// FetchSource allows to specify source filtering.
func (item *MultiGetItem) FetchSource(fetchSourceContext *FetchSourceContext) *MultiGetItem {
item.fsc = fetchSourceContext
return item
}
// Source returns the serialized JSON to be sent to Elasticsearch as
// part of a MultiGet search.
func (item *MultiGetItem) Source() (interface{}, error) {
source := make(map[string]interface{})
source["_id"] = item.id
if item.index != "" {
source["_index"] = item.index
}
if item.typ != "" {
source["_type"] = item.typ
}
if item.fsc != nil {
src, err := item.fsc.Source()
if err != nil {
return nil, err
}
source["_source"] = src
}
if item.routing != "" {
source["_routing"] = item.routing
}
if len(item.storedFields) > 0 {
source["stored_fields"] = strings.Join(item.storedFields, ",")
}
if item.version != nil {
source["version"] = fmt.Sprintf("%d", *item.version)
}
if item.versionType != "" {
source["version_type"] = item.versionType
}
return source, nil
}
// -- Result of a Multi Get request.
// MgetResponse is the outcome of a Multi GET API request.
type MgetResponse struct {
Docs []*GetResult `json:"docs,omitempty"`
}