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// Copyright 2023 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 (
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"net/url"
"path"
"github.com/prometheus/client_golang/prometheus"
)
type ilmMetric struct {
Type prometheus.ValueType
Desc *prometheus.Desc
Value func(timeMillis float64) float64
Labels []string
}
// Index Lifecycle Management information object
type IlmIndiciesCollector struct {
logger *slog.Logger
client *http.Client
url *url.URL
ilmMetric ilmMetric
}
type IlmResponse struct {
Indices map[string]IlmIndexResponse `json:"indices"`
}
type IlmIndexResponse struct {
Index string `json:"index"`
Managed bool `json:"managed"`
Phase string `json:"phase"`
Action string `json:"action"`
Step string `json:"step"`
StepTimeMillis float64 `json:"step_time_millis"`
}
var (
defaultIlmIndicesMappingsLabels = []string{"index", "phase", "action", "step"}
)
// NewIlmIndicies defines Index Lifecycle Management Prometheus metrics
func NewIlmIndicies(logger *slog.Logger, client *http.Client, url *url.URL) *IlmIndiciesCollector {
subsystem := "ilm_index"
return &IlmIndiciesCollector{
logger: logger,
client: client,
url: url,
ilmMetric: ilmMetric{
Type: prometheus.GaugeValue,
Desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "status"),
"Status of ILM policy for index",
defaultIlmIndicesMappingsLabels, nil),
Value: func(timeMillis float64) float64 {
return timeMillis
},
},
}
}
// Describe adds metrics description
func (i *IlmIndiciesCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- i.ilmMetric.Desc
}
func (i *IlmIndiciesCollector) fetchAndDecodeIlm() (IlmResponse, error) {
var ir IlmResponse
u := *i.url
u.Path = path.Join(u.Path, "/_all/_ilm/explain")
res, err := i.client.Get(u.String())
if err != nil {
return ir, fmt.Errorf("failed to get index stats from %s://%s:%s%s: %s",
u.Scheme, u.Hostname(), u.Port(), u.Path, err)
}
defer func() {
err = res.Body.Close()
if err != nil {
i.logger.Warn(
"failed to close http.Client",
"err", err,
)
}
}()
if res.StatusCode != http.StatusOK {
return ir, fmt.Errorf("HTTP Request failed with code %d", res.StatusCode)
}
bts, err := io.ReadAll(res.Body)
if err != nil {
return ir, err
}
if err := json.Unmarshal(bts, &ir); err != nil {
return ir, err
}
return ir, nil
}
func bool2int(managed bool) float64 {
if managed {
return 1
}
return 0
}
// Collect pulls metric values from Elasticsearch
func (i *IlmIndiciesCollector) Collect(ch chan<- prometheus.Metric) {
// indices
ilmResp, err := i.fetchAndDecodeIlm()
if err != nil {
i.logger.Warn(
"failed to fetch and decode ILM stats",
"err", err,
)
return
}
for indexName, indexIlm := range ilmResp.Indices {
ch <- prometheus.MustNewConstMetric(
i.ilmMetric.Desc,
i.ilmMetric.Type,
i.ilmMetric.Value(bool2int(indexIlm.Managed)),
indexName, indexIlm.Phase, indexIlm.Action, indexIlm.Step,
)
}
}
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