volker.raschek/prometheus-fail2ban-exporter
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feat: collect new up metric from fail2ban socket

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Add support for connecting the exporter directly to the fail2ban server's
socket to send requests and receive data. The path to the socket file is
optional and specified on startup.
Export a new metric based on the response of the `ping` command sent to the
fail2ban server. The metric is set to 1 if the server responds with `pong`
and 0 in any other case. This metric is only shown if the path to the
socket file was provided on startup.
This commit is contained in:
Hector
2021-08-29 11:50:53 +00:00
parent 9d6b35c59a
commit 39133d0a76
7 changed files with 167 additions and 20 deletions
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66
src/exporter.go
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@ -3,15 +3,20 @@ package main
import (
"fail2ban-prometheus-exporter/cfg"
fail2banDb "fail2ban-prometheus-exporter/db"
"fail2ban-prometheus-exporter/socket"
"fmt"
"log"
"net/http"
_ "github.com/mattn/go-sqlite3"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"log"
"net/http"
)
const namespace = "fail2ban"
const (
namespace = "fail2ban"
sockNamespace = "f2b"
)
var (
version = "dev"
@ -44,28 +49,44 @@ var (
"Number of errors found since startup.",
[]string{"type"}, nil,
)
metricServerPing = prometheus.NewDesc(
prometheus.BuildFQName(sockNamespace, "", "up"),
"Check if the fail2ban server is up",
nil, nil,
)
)
type Exporter struct {
db *fail2banDb.Fail2BanDB
socket *socket.Fail2BanSocket
lastError error
dbErrorCount int
}
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- metricUp
ch <- metricBadIpsPerJail
ch <- metricBannedIpsPerJail
ch <- metricEnabledJails
ch <- metricErrorCount
if e.db != nil {
ch <- metricUp
ch <- metricBadIpsPerJail
ch <- metricBannedIpsPerJail
ch <- metricEnabledJails
ch <- metricErrorCount
}
if e.socket != nil {
ch <- metricServerPing
}
}
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
e.collectBadIpsPerJailMetrics(ch)
e.collectBannedIpsPerJailMetrics(ch)
e.collectEnabledJailMetrics(ch)
e.collectUpMetric(ch)
e.collectErrorCountMetric(ch)
if e.db != nil {
e.collectBadIpsPerJailMetrics(ch)
e.collectBannedIpsPerJailMetrics(ch)
e.collectEnabledJailMetrics(ch)
e.collectUpMetric(ch)
e.collectErrorCountMetric(ch)
}
if e.socket != nil {
e.collectServerPingMetric(ch)
}
}
func (e *Exporter) collectUpMetric(ch chan<- prometheus.Metric) {
@ -132,6 +153,17 @@ func (e *Exporter) collectEnabledJailMetrics(ch chan<- prometheus.Metric) {
}
}
func (e *Exporter) collectServerPingMetric(ch chan<- prometheus.Metric) {
pingSuccess := e.socket.Ping()
var pingSuccessInt float64 = 1
if !pingSuccess {
pingSuccessInt = 0
}
ch <- prometheus.MustNewConstMetric(
metricServerPing, prometheus.GaugeValue, pingSuccessInt,
)
}
func printAppVersion() {
fmt.Println(version)
fmt.Printf(" build date: %s\r\n commit hash: %s\r\n built by: %s\r\n", date, commit, builtBy)
@ -144,8 +176,12 @@ func main() {
} else {
log.Print("starting fail2ban exporter")
exporter := &Exporter{
db: fail2banDb.MustConnectToDb(appSettings.Fail2BanDbPath),
exporter := &Exporter{}
if appSettings.Fail2BanDbPath != "" {
exporter.db = fail2banDb.MustConnectToDb(appSettings.Fail2BanDbPath)
}
if appSettings.Fail2BanSocketPath != "" {
exporter.socket = socket.MustConnectToSocket(appSettings.Fail2BanSocketPath)
}
prometheus.MustRegister(exporter)