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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"
"encoding/json"
"net/http"
"net/url"
)
// PingService checks if an Elasticsearch server on a given URL is alive.
// When asked for, it can also return various information about the
// Elasticsearch server, e.g. the Elasticsearch version number.
//
// Ping simply starts a HTTP GET request to the URL of the server.
// If the server responds with HTTP Status code 200 OK, the server is alive.
type PingService struct {
client *Client
url string
timeout string
httpHeadOnly bool
pretty bool
}
// PingResult is the result returned from querying the Elasticsearch server.
type PingResult struct {
Name string `json:"name"`
ClusterName string `json:"cluster_name"`
Version struct {
Number string `json:"number"`
BuildHash string `json:"build_hash"`
BuildTimestamp string `json:"build_timestamp"`
BuildSnapshot bool `json:"build_snapshot"`
LuceneVersion string `json:"lucene_version"`
} `json:"version"`
TagLine string `json:"tagline"`
}
func NewPingService(client *Client) *PingService {
return &PingService{
client: client,
url: DefaultURL,
httpHeadOnly: false,
pretty: false,
}
}
func (s *PingService) URL(url string) *PingService {
s.url = url
return s
}
func (s *PingService) Timeout(timeout string) *PingService {
s.timeout = timeout
return s
}
// HeadOnly makes the service to only return the status code in Do;
// the PingResult will be nil.
func (s *PingService) HttpHeadOnly(httpHeadOnly bool) *PingService {
s.httpHeadOnly = httpHeadOnly
return s
}
func (s *PingService) Pretty(pretty bool) *PingService {
s.pretty = pretty
return s
}
// Do returns the PingResult, the HTTP status code of the Elasticsearch
// server, and an error.
func (s *PingService) Do(ctx context.Context) (*PingResult, int, error) {
s.client.mu.RLock()
basicAuth := s.client.basicAuth
basicAuthUsername := s.client.basicAuthUsername
basicAuthPassword := s.client.basicAuthPassword
s.client.mu.RUnlock()
url_ := s.url + "/"
params := make(url.Values)
if s.timeout != "" {
params.Set("timeout", s.timeout)
}
if s.pretty {
params.Set("pretty", "1")
}
if len(params) > 0 {
url_ += "?" + params.Encode()
}
var method string
if s.httpHeadOnly {
method = "HEAD"
} else {
method = "GET"
}
// Notice: This service must NOT use PerformRequest!
req, err := NewRequest(method, url_)
if err != nil {
return nil, 0, err
}
if basicAuth {
req.SetBasicAuth(basicAuthUsername, basicAuthPassword)
}
res, err := s.client.c.Do((*http.Request)(req).WithContext(ctx))
if err != nil {
return nil, 0, err
}
defer res.Body.Close()
var ret *PingResult
if !s.httpHeadOnly {
ret = new(PingResult)
if err := json.NewDecoder(res.Body).Decode(ret); err != nil {
return nil, res.StatusCode, err
}
}
return ret, res.StatusCode, nil
}
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