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// Copyright 2012-2015 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 (
"encoding/json"
"fmt"
"net/url"
"strings"
"gopkg.in/olivere/elastic.v2/uritemplates"
)
// ScrollService manages a cursor through documents in Elasticsearch.
type ScrollService struct {
client *Client
indices []string
types []string
keepAlive string
query Query
size *int
pretty bool
scrollId string
}
func NewScrollService(client *Client) *ScrollService {
builder := &ScrollService{
client: client,
query: NewMatchAllQuery(),
}
return builder
}
func (s *ScrollService) Index(index string) *ScrollService {
if s.indices == nil {
s.indices = make([]string, 0)
}
s.indices = append(s.indices, index)
return s
}
func (s *ScrollService) Indices(indices ...string) *ScrollService {
if s.indices == nil {
s.indices = make([]string, 0)
}
s.indices = append(s.indices, indices...)
return s
}
func (s *ScrollService) Type(typ string) *ScrollService {
if s.types == nil {
s.types = make([]string, 0)
}
s.types = append(s.types, typ)
return s
}
func (s *ScrollService) Types(types ...string) *ScrollService {
if s.types == nil {
s.types = make([]string, 0)
}
s.types = append(s.types, types...)
return s
}
// Scroll is an alias for KeepAlive, the time to keep
// the cursor alive (e.g. "5m" for 5 minutes).
func (s *ScrollService) Scroll(keepAlive string) *ScrollService {
s.keepAlive = keepAlive
return s
}
// KeepAlive sets the maximum time the cursor will be
// available before expiration (e.g. "5m" for 5 minutes).
func (s *ScrollService) KeepAlive(keepAlive string) *ScrollService {
s.keepAlive = keepAlive
return s
}
func (s *ScrollService) Query(query Query) *ScrollService {
s.query = query
return s
}
func (s *ScrollService) Pretty(pretty bool) *ScrollService {
s.pretty = pretty
return s
}
func (s *ScrollService) Size(size int) *ScrollService {
s.size = &size
return s
}
func (s *ScrollService) ScrollId(scrollId string) *ScrollService {
s.scrollId = scrollId
return s
}
func (s *ScrollService) Do() (*SearchResult, error) {
if s.scrollId == "" {
return s.GetFirstPage()
}
return s.GetNextPage()
}
func (s *ScrollService) GetFirstPage() (*SearchResult, error) {
// Build url
path := "/"
// Indices part
indexPart := make([]string, 0)
for _, index := range s.indices {
index, err := uritemplates.Expand("{index}", map[string]string{
"index": index,
})
if err != nil {
return nil, err
}
indexPart = append(indexPart, index)
}
if len(indexPart) > 0 {
path += strings.Join(indexPart, ",")
}
// Types
typesPart := make([]string, 0)
for _, typ := range s.types {
typ, err := uritemplates.Expand("{type}", map[string]string{
"type": typ,
})
if err != nil {
return nil, err
}
typesPart = append(typesPart, typ)
}
if len(typesPart) > 0 {
path += "/" + strings.Join(typesPart, ",")
}
// Search
path += "/_search"
// Parameters
params := make(url.Values)
params.Set("search_type", "scan")
if s.pretty {
params.Set("pretty", fmt.Sprintf("%v", s.pretty))
}
if s.keepAlive != "" {
params.Set("scroll", s.keepAlive)
} else {
params.Set("scroll", defaultKeepAlive)
}
if s.size != nil && *s.size > 0 {
params.Set("size", fmt.Sprintf("%d", *s.size))
}
// Set body
body := make(map[string]interface{})
if s.query != nil {
body["query"] = s.query.Source()
}
// Get response
res, err := s.client.PerformRequest("POST", path, params, body)
if err != nil {
return nil, err
}
// Return result
searchResult := new(SearchResult)
if err := json.Unmarshal(res.Body, searchResult); err != nil {
return nil, err
}
return searchResult, nil
}
func (s *ScrollService) GetNextPage() (*SearchResult, error) {
if s.scrollId == "" {
return nil, EOS
}
// Build url
path := "/_search/scroll"
// Parameters
params := make(url.Values)
if s.pretty {
params.Set("pretty", fmt.Sprintf("%v", s.pretty))
}
if s.keepAlive != "" {
params.Set("scroll", s.keepAlive)
} else {
params.Set("scroll", defaultKeepAlive)
}
// Get response
res, err := s.client.PerformRequest("POST", path, params, s.scrollId)
if err != nil {
return nil, err
}
// Return result
searchResult := new(SearchResult)
if err := json.Unmarshal(res.Body, searchResult); err != nil {
return nil, err
}
// Determine last page
if searchResult == nil || searchResult.Hits == nil || len(searchResult.Hits.Hits) == 0 || searchResult.Hits.TotalHits == 0 {
return nil, EOS
}
return searchResult, nil
}
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