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indices_exists_template.go 2.98 KB
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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 (
"fmt"
"net/http"
"net/url"
"golang.org/x/net/context"
"gopkg.in/olivere/elastic.v3/uritemplates"
)
// IndicesExistsTemplateService checks if a given template exists.
// See http://www.elastic.co/guide/en/elasticsearch/reference/current/indices-templates.html#indices-templates-exists
// for documentation.
type IndicesExistsTemplateService struct {
client *Client
pretty bool
name string
local *bool
}
// NewIndicesExistsTemplateService creates a new IndicesExistsTemplateService.
func NewIndicesExistsTemplateService(client *Client) *IndicesExistsTemplateService {
return &IndicesExistsTemplateService{
client: client,
}
}
// Name is the name of the template.
func (s *IndicesExistsTemplateService) Name(name string) *IndicesExistsTemplateService {
s.name = name
return s
}
// Local indicates whether to return local information, i.e. do not retrieve
// the state from master node (default: false).
func (s *IndicesExistsTemplateService) Local(local bool) *IndicesExistsTemplateService {
s.local = &local
return s
}
// Pretty indicates that the JSON response be indented and human readable.
func (s *IndicesExistsTemplateService) Pretty(pretty bool) *IndicesExistsTemplateService {
s.pretty = pretty
return s
}
// buildURL builds the URL for the operation.
func (s *IndicesExistsTemplateService) buildURL() (string, url.Values, error) {
// Build URL
path, err := uritemplates.Expand("/_template/{name}", map[string]string{
"name": s.name,
})
if err != nil {
return "", url.Values{}, err
}
// Add query string parameters
params := url.Values{}
if s.pretty {
params.Set("pretty", "1")
}
if s.local != nil {
params.Set("local", fmt.Sprintf("%v", *s.local))
}
return path, params, nil
}
// Validate checks if the operation is valid.
func (s *IndicesExistsTemplateService) Validate() error {
var invalid []string
if s.name == "" {
invalid = append(invalid, "Name")
}
if len(invalid) > 0 {
return fmt.Errorf("missing required fields: %v", invalid)
}
return nil
}
// Do executes the operation.
func (s *IndicesExistsTemplateService) Do() (bool, error) {
return s.DoC(nil)
}
// DoC executes the operation.
func (s *IndicesExistsTemplateService) DoC(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.PerformRequestC(ctx, "HEAD", path, params, nil, 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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