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indices_settings.go
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/
indices_settings.go
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// Copyright 2021 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/ioutil"
"net/http"
"net/url"
"path"
"strconv"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
)
// IndicesSettings information struct
type IndicesSettings struct {
logger log.Logger
client *http.Client
url *url.URL
up prometheus.Gauge
readOnlyIndices prometheus.Gauge
totalScrapes, jsonParseFailures prometheus.Counter
metrics []*indicesSettingsMetric
}
var (
defaultIndicesTotalFieldsLabels = []string{"index"}
defaultTotalFieldsValue = 1000 //es default configuration for total fields
)
type indicesSettingsMetric struct {
Type prometheus.ValueType
Desc *prometheus.Desc
Value func(indexSettings Settings) float64
}
// NewIndicesSettings defines Indices Settings Prometheus metrics
func NewIndicesSettings(logger log.Logger, client *http.Client, url *url.URL) *IndicesSettings {
return &IndicesSettings{
logger: logger,
client: client,
url: url,
up: prometheus.NewGauge(prometheus.GaugeOpts{
Name: prometheus.BuildFQName(namespace, "indices_settings_stats", "up"),
Help: "Was the last scrape of the Elasticsearch Indices Settings endpoint successful.",
}),
totalScrapes: prometheus.NewCounter(prometheus.CounterOpts{
Name: prometheus.BuildFQName(namespace, "indices_settings_stats", "total_scrapes"),
Help: "Current total Elasticsearch Indices Settings scrapes.",
}),
readOnlyIndices: prometheus.NewGauge(prometheus.GaugeOpts{
Name: prometheus.BuildFQName(namespace, "indices_settings_stats", "read_only_indices"),
Help: "Current number of read only indices within cluster",
}),
jsonParseFailures: prometheus.NewCounter(prometheus.CounterOpts{
Name: prometheus.BuildFQName(namespace, "indices_settings_stats", "json_parse_failures"),
Help: "Number of errors while parsing JSON.",
}),
metrics: []*indicesSettingsMetric{
{
Type: prometheus.GaugeValue,
Desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "indices_settings", "total_fields"),
"index mapping setting for total_fields",
defaultIndicesTotalFieldsLabels, nil,
),
Value: func(indexSettings Settings) float64 {
val, err := strconv.ParseFloat(indexSettings.IndexInfo.Mapping.TotalFields.Limit, 64)
if err != nil {
return float64(defaultTotalFieldsValue)
}
return val
},
},
},
}
}
// Describe add Snapshots metrics descriptions
func (cs *IndicesSettings) Describe(ch chan<- *prometheus.Desc) {
ch <- cs.up.Desc()
ch <- cs.totalScrapes.Desc()
ch <- cs.readOnlyIndices.Desc()
ch <- cs.jsonParseFailures.Desc()
}
func (cs *IndicesSettings) getAndParseURL(u *url.URL, data interface{}) error {
res, err := cs.client.Get(u.String())
if err != nil {
return fmt.Errorf("failed to get from %s://%s:%s%s: %s",
u.Scheme, u.Hostname(), u.Port(), u.Path, err)
}
defer func() {
err = res.Body.Close()
if err != nil {
_ = level.Warn(cs.logger).Log(
"msg", "failed to close http.Client",
"err", err,
)
}
}()
if res.StatusCode != http.StatusOK {
return fmt.Errorf("HTTP Request failed with code %d", res.StatusCode)
}
bts, err := ioutil.ReadAll(res.Body)
if err != nil {
cs.jsonParseFailures.Inc()
return err
}
if err := json.Unmarshal(bts, data); err != nil {
cs.jsonParseFailures.Inc()
return err
}
return nil
}
func (cs *IndicesSettings) fetchAndDecodeIndicesSettings() (IndicesSettingsResponse, error) {
u := *cs.url
u.Path = path.Join(u.Path, "/_all/_settings")
var asr IndicesSettingsResponse
err := cs.getAndParseURL(&u, &asr)
if err != nil {
return asr, err
}
return asr, err
}
// Collect gets all indices settings metric values
func (cs *IndicesSettings) Collect(ch chan<- prometheus.Metric) {
cs.totalScrapes.Inc()
defer func() {
ch <- cs.up
ch <- cs.totalScrapes
ch <- cs.jsonParseFailures
ch <- cs.readOnlyIndices
}()
asr, err := cs.fetchAndDecodeIndicesSettings()
if err != nil {
cs.readOnlyIndices.Set(0)
cs.up.Set(0)
_ = level.Warn(cs.logger).Log(
"msg", "failed to fetch and decode cluster settings stats",
"err", err,
)
return
}
cs.up.Set(1)
var c int
for indexName, value := range asr {
if value.Settings.IndexInfo.Blocks.ReadOnly == "true" {
c++
}
for _, metric := range cs.metrics {
ch <- prometheus.MustNewConstMetric(
metric.Desc,
metric.Type,
metric.Value(value.Settings),
indexName,
)
}
}
cs.readOnlyIndices.Set(float64(c))
}