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// Copyright 2022 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package collector
import (
"context"
"encoding/json"
"io"
"log/slog"
"net/http"
"net/url"
"github.com/blang/semver/v4"
"github.com/prometheus/client_golang/prometheus"
)
func init() {
registerCollector("cluster-info", defaultEnabled, NewClusterInfo)
}
type ClusterInfoCollector struct {
logger *slog.Logger
u *url.URL
hc *http.Client
}
func NewClusterInfo(logger *slog.Logger, u *url.URL, hc *http.Client) (Collector, error) {
return &ClusterInfoCollector{
logger: logger,
u: u,
hc: hc,
}, nil
}
var clusterInfoDesc = map[string]*prometheus.Desc{
"version": prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "version"),
"Elasticsearch version information.",
[]string{
"cluster",
"cluster_uuid",
"build_date",
"build_hash",
"version",
"lucene_version",
},
nil,
),
}
// ClusterInfoResponse is the cluster info retrievable from the / endpoint
type ClusterInfoResponse struct {
Name string `json:"name"`
ClusterName string `json:"cluster_name"`
ClusterUUID string `json:"cluster_uuid"`
Version VersionInfo `json:"version"`
Tagline string `json:"tagline"`
}
// VersionInfo is the version info retrievable from the / endpoint, embedded in ClusterInfoResponse
type VersionInfo struct {
Number semver.Version `json:"number"`
BuildHash string `json:"build_hash"`
BuildDate string `json:"build_date"`
BuildSnapshot bool `json:"build_snapshot"`
LuceneVersion semver.Version `json:"lucene_version"`
}
func (c *ClusterInfoCollector) Update(_ context.Context, ch chan<- prometheus.Metric) error {
resp, err := c.hc.Get(c.u.String())
if err != nil {
return err
}
defer resp.Body.Close()
b, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
var info ClusterInfoResponse
err = json.Unmarshal(b, &info)
if err != nil {
return err
}
ch <- prometheus.MustNewConstMetric(
clusterInfoDesc["version"],
prometheus.GaugeValue,
1,
info.ClusterName,
info.ClusterUUID,
info.Version.BuildDate,
info.Version.BuildHash,
info.Version.Number.String(),
info.Version.LuceneVersion.String(),
)
return nil
}
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