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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/imdario/mergo"
"github.com/prometheus/client_golang/prometheus"
)
// ClusterSettings information struct
type ClusterSettings struct {
logger log.Logger
client *http.Client
url *url.URL
up prometheus.Gauge
shardAllocationEnabled prometheus.Gauge
totalScrapes, jsonParseFailures prometheus.Counter
}
// NewClusterSettings defines Cluster Settings Prometheus metrics
func NewClusterSettings(logger log.Logger, client *http.Client, url *url.URL) *ClusterSettings {
return &ClusterSettings{
logger: logger,
client: client,
url: url,
up: prometheus.NewGauge(prometheus.GaugeOpts{
Name: prometheus.BuildFQName(namespace, "clustersettings_stats", "up"),
Help: "Was the last scrape of the ElasticSearch cluster settings endpoint successful.",
}),
totalScrapes: prometheus.NewCounter(prometheus.CounterOpts{
Name: prometheus.BuildFQName(namespace, "clustersettings_stats", "total_scrapes"),
Help: "Current total ElasticSearch cluster settings scrapes.",
}),
shardAllocationEnabled: prometheus.NewGauge(prometheus.GaugeOpts{
Name: prometheus.BuildFQName(namespace, "clustersettings_stats", "shard_allocation_enabled"),
Help: "Current mode of cluster wide shard routing allocation settings.",
}),
jsonParseFailures: prometheus.NewCounter(prometheus.CounterOpts{
Name: prometheus.BuildFQName(namespace, "clustersettings_stats", "json_parse_failures"),
Help: "Number of errors while parsing JSON.",
}),
}
}
// Describe add Snapshots metrics descriptions
func (cs *ClusterSettings) Describe(ch chan<- *prometheus.Desc) {
ch <- cs.up.Desc()
ch <- cs.totalScrapes.Desc()
ch <- cs.shardAllocationEnabled.Desc()
ch <- cs.jsonParseFailures.Desc()
}
func (cs *ClusterSettings) 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 *ClusterSettings) fetchAndDecodeClusterSettingsStats() (ClusterSettingsResponse, error) {
u := *cs.url
u.Path = path.Join(u.Path, "/_cluster/settings")
q := u.Query()
q.Set("include_defaults", "true")
u.RawPath = q.Encode()
var csfr ClusterSettingsFullResponse
var csr ClusterSettingsResponse
err := cs.getAndParseURL(&u, &csfr)
if err != nil {
return csr, err
}
err = mergo.Merge(&csr, csfr.Defaults, mergo.WithOverride)
if err != nil {
return csr, err
}
err = mergo.Merge(&csr, csfr.Persistent, mergo.WithOverride)
if err != nil {
return csr, err
}
err = mergo.Merge(&csr, csfr.Transient, mergo.WithOverride)
return csr, err
}
// Collect gets cluster settings metric values
func (cs *ClusterSettings) Collect(ch chan<- prometheus.Metric) {
cs.totalScrapes.Inc()
defer func() {
ch <- cs.up
ch <- cs.totalScrapes
ch <- cs.jsonParseFailures
ch <- cs.shardAllocationEnabled
}()
csr, err := cs.fetchAndDecodeClusterSettingsStats()
if err != nil {
cs.shardAllocationEnabled.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)
shardAllocationMap := map[string]int{
"all": 0,
"primaries": 1,
"new_primaries": 2,
"none": 3,
}
cs.shardAllocationEnabled.Set(float64(shardAllocationMap[csr.Cluster.Routing.Allocation.Enabled]))
}
|
