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indices_mappings.go
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/
indices_mappings.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"
"net/http"
"net/url"
"path"
"github.com/cprobe/cprobe/lib/logger"
"github.com/prometheus/client_golang/prometheus"
)
var (
defaultIndicesMappingsLabels = []string{"index"}
)
type indicesMappingsMetric struct {
Type prometheus.ValueType
Desc *prometheus.Desc
Value func(indexMapping IndexMapping) float64
}
// IndicesMappings information struct
type IndicesMappings struct {
client *http.Client
url *url.URL
metrics []*indicesMappingsMetric
}
// NewIndicesMappings defines Indices IndexMappings Prometheus metrics
func NewIndicesMappings(client *http.Client, url *url.URL) *IndicesMappings {
subsystem := "indices_mappings_stats"
return &IndicesMappings{
client: client,
url: url,
metrics: []*indicesMappingsMetric{
{
Type: prometheus.GaugeValue,
Desc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, subsystem, "fields"),
"Current number fields within cluster.",
defaultIndicesMappingsLabels, nil,
),
Value: func(indexMapping IndexMapping) float64 {
return countFieldsRecursive(indexMapping.Mappings.Properties, 0)
},
},
},
}
}
func countFieldsRecursive(properties IndexMappingProperties, fieldCounter float64) float64 {
// iterate over all properties
for _, property := range properties {
if property.Type != nil && *property.Type != "object" {
// property has a type set - counts as a field unless the value is object
// as the recursion below will handle counting that
fieldCounter++
// iterate over all fields of that property
for _, field := range property.Fields {
// field has a type set - counts as a field
if field.Type != nil {
fieldCounter++
}
}
}
// count recursively in case the property has more properties
if property.Properties != nil {
fieldCounter = 1 + countFieldsRecursive(property.Properties, fieldCounter)
}
}
return fieldCounter
}
// Describe add Snapshots metrics descriptions
func (im *IndicesMappings) Describe(ch chan<- *prometheus.Desc) {
for _, metric := range im.metrics {
ch <- metric.Desc
}
}
func (im *IndicesMappings) getAndParseURL(u *url.URL) (*IndicesMappingsResponse, error) {
res, err := im.client.Get(u.String())
if err != nil {
return nil, fmt.Errorf("failed to get from %s://%s:%s%s: %s",
u.Scheme, u.Hostname(), u.Port(), u.Path, err)
}
if res.Body == nil {
return nil, fmt.Errorf("empty response body")
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("HTTP Request failed with code %d", res.StatusCode)
}
body, err := io.ReadAll(res.Body)
if err != nil {
logger.Warnf("failed to read response body: %s", err)
return nil, err
}
var imr IndicesMappingsResponse
if err := json.Unmarshal(body, &imr); err != nil {
return nil, err
}
return &imr, nil
}
func (im *IndicesMappings) fetchAndDecodeIndicesMappings() (*IndicesMappingsResponse, error) {
u := *im.url
u.Path = path.Join(u.Path, "/_all/_mappings")
return im.getAndParseURL(&u)
}
// Collect gets all indices mappings metric values
func (im *IndicesMappings) Collect(ch chan<- prometheus.Metric) {
indicesMappingsResponse, err := im.fetchAndDecodeIndicesMappings()
if err != nil {
logger.Warnf("failed to fetch and decode indices mappings stats: %s", err)
return
}
for _, metric := range im.metrics {
for indexName, mappings := range *indicesMappingsResponse {
ch <- prometheus.MustNewConstMetric(
metric.Desc,
metric.Type,
metric.Value(mappings),
indexName,
)
}
}
}