0b40e5de82
Add dependencies on `sqlite` to allow connecting to the fail2ban database. Add a new `db` module to handle all the database connections and data queries used to generate metrics. Export a new metric for the total number of bad IPs stored in the fail2ban database.
59 lines
1.3 KiB
Go
59 lines
1.3 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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metricBadIpTotal = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "badip_total"),
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"Total number of bad IPs stored in the database.",
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nil, 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 <- metricBadIpTotal
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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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ch <- *collectTotalBadIpMetric()
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}
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func collectTotalBadIpMetric() *prometheus.Metric {
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count, _ := db.CountTotalBadIps()
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metric := prometheus.MustNewConstMetric(
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metricBadIpTotal, prometheus.GaugeValue, float64(count),
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)
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return &metric
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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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