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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 (
"context"
"fmt"
"net/http"
"net/url"
"strings"
"github.com/olivere/elastic/uritemplates"
)
// IndicesExistsService checks if an index or indices exist or not.
//
// See https://www.elastic.co/guide/en/elasticsearch/reference/6.0/indices-exists.html
// for details.
type IndicesExistsService struct {
client *Client
pretty bool
index []string
ignoreUnavailable *bool
allowNoIndices *bool
expandWildcards string
local *bool
}
// NewIndicesExistsService creates and initializes a new IndicesExistsService.
func NewIndicesExistsService(client *Client) *IndicesExistsService {
return &IndicesExistsService{
client: client,
index: make([]string, 0),
}
}
// Index is a list of one or more indices to check.
func (s *IndicesExistsService) Index(index []string) *IndicesExistsService {
s.index = index
return s
}
// AllowNoIndices indicates whether to ignore if a wildcard indices expression
// resolves into no concrete indices. (This includes `_all` string or
// when no indices have been specified).
func (s *IndicesExistsService) AllowNoIndices(allowNoIndices bool) *IndicesExistsService {
s.allowNoIndices = &allowNoIndices
return s
}
// ExpandWildcards indicates whether to expand wildcard expression to
// concrete indices that are open, closed or both.
func (s *IndicesExistsService) ExpandWildcards(expandWildcards string) *IndicesExistsService {
s.expandWildcards = expandWildcards
return s
}
// Local, when set, returns local information and does not retrieve the state
// from master node (default: false).
func (s *IndicesExistsService) Local(local bool) *IndicesExistsService {
s.local = &local
return s
}
// IgnoreUnavailable indicates whether specified concrete indices should be
// ignored when unavailable (missing or closed).
func (s *IndicesExistsService) IgnoreUnavailable(ignoreUnavailable bool) *IndicesExistsService {
s.ignoreUnavailable = &ignoreUnavailable
return s
}
// Pretty indicates that the JSON response be indented and human readable.
func (s *IndicesExistsService) Pretty(pretty bool) *IndicesExistsService {
s.pretty = pretty
return s
}
// buildURL builds the URL for the operation.
func (s *IndicesExistsService) buildURL() (string, url.Values, error) {
// Build URL
path, err := uritemplates.Expand("/{index}", map[string]string{
"index": strings.Join(s.index, ","),
})
if err != nil {
return "", url.Values{}, err
}
// Add query string parameters
params := url.Values{}
if s.pretty {
params.Set("pretty", "true")
}
if s.local != nil {
params.Set("local", fmt.Sprintf("%v", *s.local))
}
if s.ignoreUnavailable != nil {
params.Set("ignore_unavailable", fmt.Sprintf("%v", *s.ignoreUnavailable))
}
if s.allowNoIndices != nil {
params.Set("allow_no_indices", fmt.Sprintf("%v", *s.allowNoIndices))
}
if s.expandWildcards != "" {
params.Set("expand_wildcards", s.expandWildcards)
}
return path, params, nil
}
// Validate checks if the operation is valid.
func (s *IndicesExistsService) Validate() error {
var invalid []string
if len(s.index) == 0 {
invalid = append(invalid, "Index")
}
if len(invalid) > 0 {
return fmt.Errorf("missing required fields: %v", invalid)
}
return nil
}
// Do executes the operation.
func (s *IndicesExistsService) Do(ctx context.Context) (bool, error) {
// Check pre-conditions
if err := s.Validate(); err != nil {
return false, err
}
// Get URL for request
path, params, err := s.buildURL()
if err != nil {
return false, err
}
// Get HTTP response
res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
Method: "HEAD",
Path: path,
Params: params,
IgnoreErrors: []int{404},
})
if err != nil {
return false, err
}
// Return operation response
switch res.StatusCode {
case http.StatusOK:
return true, nil
case http.StatusNotFound:
return false, nil
default:
return false, fmt.Errorf("elastic: got HTTP code %d when it should have been either 200 or 404", res.StatusCode)
}
}
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