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package collector
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
"path"
"github.com/go-kit/kit/log"
"github.com/go-kit/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
}
// 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.",
}),
}
}
// 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)
}
if err := json.NewDecoder(res.Body).Decode(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 _, value := range asr {
if value.Settings.IndexInfo.Blocks.ReadOnly == "true" {
c++
}
}
cs.readOnlyIndices.Set(float64(c))
}
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