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129 lines
3.1 KiB
129 lines
3.1 KiB
// Copyright 2012-present Oliver Eilhard. All rights reserved.
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// Use of this source code is governed by a MIT-license.
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// See http://olivere.mit-license.org/license.txt for details.
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package elastic
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import (
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"encoding/json"
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"net/http"
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"net/url"
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"golang.org/x/net/context"
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"golang.org/x/net/context/ctxhttp"
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)
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// PingService checks if an Elasticsearch server on a given URL is alive.
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// When asked for, it can also return various information about the
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// Elasticsearch server, e.g. the Elasticsearch version number.
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//
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// Ping simply starts a HTTP GET request to the URL of the server.
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// If the server responds with HTTP Status code 200 OK, the server is alive.
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type PingService struct {
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client *Client
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url string
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timeout string
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httpHeadOnly bool
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pretty bool
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}
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// PingResult is the result returned from querying the Elasticsearch server.
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type PingResult struct {
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Name string `json:"name"`
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ClusterName string `json:"cluster_name"`
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Version struct {
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Number string `json:"number"`
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BuildHash string `json:"build_hash"`
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BuildTimestamp string `json:"build_timestamp"`
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BuildSnapshot bool `json:"build_snapshot"`
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LuceneVersion string `json:"lucene_version"`
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} `json:"version"`
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TagLine string `json:"tagline"`
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}
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func NewPingService(client *Client) *PingService {
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return &PingService{
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client: client,
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url: DefaultURL,
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httpHeadOnly: false,
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pretty: false,
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}
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}
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func (s *PingService) URL(url string) *PingService {
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s.url = url
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return s
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}
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func (s *PingService) Timeout(timeout string) *PingService {
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s.timeout = timeout
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return s
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}
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// HeadOnly makes the service to only return the status code in Do;
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// the PingResult will be nil.
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func (s *PingService) HttpHeadOnly(httpHeadOnly bool) *PingService {
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s.httpHeadOnly = httpHeadOnly
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return s
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}
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func (s *PingService) Pretty(pretty bool) *PingService {
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s.pretty = pretty
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return s
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}
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// Do returns the PingResult, the HTTP status code of the Elasticsearch
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// server, and an error.
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func (s *PingService) Do(ctx context.Context) (*PingResult, int, error) {
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s.client.mu.RLock()
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basicAuth := s.client.basicAuth
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basicAuthUsername := s.client.basicAuthUsername
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basicAuthPassword := s.client.basicAuthPassword
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s.client.mu.RUnlock()
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url_ := s.url + "/"
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params := make(url.Values)
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if s.timeout != "" {
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params.Set("timeout", s.timeout)
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}
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if s.pretty {
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params.Set("pretty", "1")
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}
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if len(params) > 0 {
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url_ += "?" + params.Encode()
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}
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var method string
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if s.httpHeadOnly {
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method = "HEAD"
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} else {
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method = "GET"
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}
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// Notice: This service must NOT use PerformRequest!
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req, err := NewRequest(method, url_)
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if err != nil {
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return nil, 0, err
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}
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if basicAuth {
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req.SetBasicAuth(basicAuthUsername, basicAuthPassword)
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}
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res, err := ctxhttp.Do(ctx, s.client.c, (*http.Request)(req))
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if err != nil {
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return nil, 0, err
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}
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defer res.Body.Close()
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var ret *PingResult
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if !s.httpHeadOnly {
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ret = new(PingResult)
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if err := json.NewDecoder(res.Body).Decode(ret); err != nil {
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return nil, res.StatusCode, err
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}
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}
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return ret, res.StatusCode, nil
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}
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