4b965017d2
Update exported metrics to spit the number of bad IPs per jail using metric value labels. This includes a change to the database code to use a different query that groups the count by the `jail` column.
64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package main
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import (
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fail2banDb "fail2ban-prometheus-exporter/db"
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_ "github.com/mattn/go-sqlite3"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"log"
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"net/http"
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)
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const namespace = "fail2ban"
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var (
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db = fail2banDb.MustConnectToDb("fail2ban.sqlite3")
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metricUp = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "up"),
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"Was the last fail2ban query successful.",
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nil, nil,
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)
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metricBadIpsPerJail = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "bad_ips"),
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"Number of bad IPs stored in the database (per jail).",
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[]string{"jail"}, nil,
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)
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)
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type Exporter struct {
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}
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func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
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ch <- metricUp
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ch <- metricBadIpsPerJail
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}
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func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
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ch <- prometheus.MustNewConstMetric(
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metricUp, prometheus.GaugeValue, 1,
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)
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collectBadIpsPerJailMetrics(ch)
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}
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func collectBadIpsPerJailMetrics(ch chan<- prometheus.Metric) {
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jailNameToCountMap, err := db.CountBadIpsPerJail()
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if err != nil {
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log.Print(err)
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}
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for jailName, count := range jailNameToCountMap {
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ch <- prometheus.MustNewConstMetric(
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metricBadIpsPerJail, prometheus.GaugeValue, float64(count), jailName,
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)
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}
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}
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func main() {
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log.Print("starting fail2ban exporter")
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exporter := &Exporter{}
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prometheus.MustRegister(exporter)
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http.Handle("/metrics", promhttp.Handler())
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log.Fatal(http.ListenAndServe(":9101", nil))
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}
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