refactor: move exporter code to new package
Split out all the code to define exporter functions and collect data into a new package. The new package is responsible for all exporter related activity. This makes the code easier to read. Split the code for collecting metrics from the database and from the socket into different files to make the separation more obvious.
This commit is contained in:
Hector
parent
911736cee4
commit
03f5084020
5 changed files with 333 additions and 287 deletions
25
src/export/build.go
Normal file
25
src/export/build.go
Normal file
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@ -0,0 +1,25 @@
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package export
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import (
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"fail2ban-prometheus-exporter/cfg"
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fail2banDb "fail2ban-prometheus-exporter/db"
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"log"
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)
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func NewExporter(appSettings *cfg.AppSettings, exporterVersion string) *Exporter {
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exporter := &Exporter{
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exporterVersion: exporterVersion,
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lastError: nil,
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dbErrorCount: 0,
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socketConnectionErrorCount: 0,
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socketRequestErrorCount: 0,
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}
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if appSettings.Fail2BanDbPath != "" {
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log.Print("database-based metrics have been deprecated and will be removed in a future release")
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exporter.db = fail2banDb.MustConnectToDb(appSettings.Fail2BanDbPath)
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}
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if appSettings.Fail2BanSocketPath != "" {
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exporter.socketPath = appSettings.Fail2BanSocketPath
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}
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return exporter
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}
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102
src/export/database.go
Normal file
102
src/export/database.go
Normal file
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@ -0,0 +1,102 @@
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package export
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import (
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"github.com/prometheus/client_golang/prometheus"
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"log"
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)
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const (
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deprecatedNamespace = "fail2ban"
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)
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var (
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deprecatedMetricUp = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "up"),
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"(Deprecated) Was the last fail2ban query successful.",
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nil, nil,
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)
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deprecatedMetricBannedIpsPerJail = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "banned_ips"),
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"(Deprecated) Number of banned IPs stored in the database (per jail).",
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[]string{"jail"}, nil,
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)
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deprecatedMetricBadIpsPerJail = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "bad_ips"),
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"(Deprecated) 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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deprecatedMetricEnabledJails = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "enabled_jails"),
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"(Deprecated) Enabled jails.",
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[]string{"jail"}, nil,
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)
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deprecatedMetricErrorCount = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "errors"),
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"(Deprecated) Number of errors found since startup.",
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[]string{"type"}, nil,
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)
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)
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func (e *Exporter) collectDeprecatedUpMetric(ch chan<- prometheus.Metric) {
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var upMetricValue float64 = 1
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if e.lastError != nil {
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upMetricValue = 0
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}
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ch <- prometheus.MustNewConstMetric(
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deprecatedMetricUp, prometheus.GaugeValue, upMetricValue,
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)
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}
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func (e *Exporter) collectDeprecatedErrorCountMetric(ch chan<- prometheus.Metric) {
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ch <- prometheus.MustNewConstMetric(
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deprecatedMetricErrorCount, prometheus.CounterValue, float64(e.dbErrorCount), "db",
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)
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}
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func (e *Exporter) collectDeprecatedBadIpsPerJailMetrics(ch chan<- prometheus.Metric) {
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jailNameToCountMap, err := e.db.CountBadIpsPerJail()
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e.lastError = err
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if err != nil {
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e.dbErrorCount++
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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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deprecatedMetricBadIpsPerJail, prometheus.GaugeValue, float64(count), jailName,
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)
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}
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}
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func (e *Exporter) collectDeprecatedBannedIpsPerJailMetrics(ch chan<- prometheus.Metric) {
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jailNameToCountMap, err := e.db.CountBannedIpsPerJail()
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e.lastError = err
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if err != nil {
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e.dbErrorCount++
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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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deprecatedMetricBannedIpsPerJail, prometheus.GaugeValue, float64(count), jailName,
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)
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}
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}
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func (e *Exporter) collectDeprecatedEnabledJailMetrics(ch chan<- prometheus.Metric) {
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jailNameToEnabledMap, err := e.db.JailNameToEnabledValue()
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e.lastError = err
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if err != nil {
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e.dbErrorCount++
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log.Print(err)
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}
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for jailName, count := range jailNameToEnabledMap {
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ch <- prometheus.MustNewConstMetric(
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deprecatedMetricEnabledJails, prometheus.GaugeValue, float64(count), jailName,
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)
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}
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}
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64
src/export/exporter.go
Normal file
64
src/export/exporter.go
Normal file
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@ -0,0 +1,64 @@
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package export
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import (
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fail2banDb "fail2ban-prometheus-exporter/db"
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"fail2ban-prometheus-exporter/socket"
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"github.com/prometheus/client_golang/prometheus"
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"log"
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)
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type Exporter struct {
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db *fail2banDb.Fail2BanDB
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socketPath string
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exporterVersion string
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lastError error
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dbErrorCount int
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socketConnectionErrorCount int
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socketRequestErrorCount int
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}
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func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
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if e.db != nil {
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ch <- deprecatedMetricUp
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ch <- deprecatedMetricBadIpsPerJail
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ch <- deprecatedMetricBannedIpsPerJail
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ch <- deprecatedMetricEnabledJails
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ch <- deprecatedMetricErrorCount
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}
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if e.socketPath != "" {
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ch <- metricServerUp
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ch <- metricJailCount
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ch <- metricJailFailedCurrent
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ch <- metricJailFailedTotal
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ch <- metricJailBannedCurrent
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ch <- metricJailBannedTotal
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}
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ch <- metricErrorCount
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}
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func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
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if e.db != nil {
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e.collectDeprecatedBadIpsPerJailMetrics(ch)
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e.collectDeprecatedBannedIpsPerJailMetrics(ch)
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e.collectDeprecatedEnabledJailMetrics(ch)
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e.collectDeprecatedUpMetric(ch)
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e.collectDeprecatedErrorCountMetric(ch)
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}
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if e.socketPath != "" {
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s, err := socket.ConnectToSocket(e.socketPath)
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if err != nil {
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log.Printf("error opening socket: %v", err)
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e.socketConnectionErrorCount++
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} else {
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defer s.Close()
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}
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e.collectServerUpMetric(ch, s)
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if err == nil && s != nil {
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e.collectJailMetrics(ch, s)
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}
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e.collectVersionMetric(ch, s)
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} else {
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e.collectVersionMetric(ch, nil)
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}
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e.collectErrorCountMetric(ch)
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}
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140
src/export/socket.go
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140
src/export/socket.go
Normal file
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@ -0,0 +1,140 @@
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package export
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import (
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"fail2ban-prometheus-exporter/socket"
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"github.com/prometheus/client_golang/prometheus"
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"log"
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)
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const (
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namespace = "f2b"
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)
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var (
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metricErrorCount = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "errors"),
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"Number of errors found since startup",
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[]string{"type"}, nil,
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)
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metricServerUp = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "up"),
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"Check if the fail2ban server is up",
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nil, nil,
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)
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metricJailCount = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_count"),
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"Number of defined jails",
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nil, nil,
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)
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metricJailFailedCurrent = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_failed_current"),
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"Number of current failures on this jail's filter",
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[]string{"jail"}, nil,
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)
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metricJailFailedTotal = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_failed_total"),
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"Number of total failures on this jail's filter",
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[]string{"jail"}, nil,
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)
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metricJailBannedCurrent = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_banned_current"),
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"Number of IPs currently banned in this jail",
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[]string{"jail"}, nil,
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)
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metricJailBannedTotal = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_banned_total"),
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"Total number of IPs banned by this jail (includes expired bans)",
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[]string{"jail"}, nil,
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)
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metricVersionInfo = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "version"),
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"Version of the exporter and fail2ban server",
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[]string{"exporter", "fail2ban"}, nil,
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)
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)
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func (e *Exporter) collectErrorCountMetric(ch chan<- prometheus.Metric) {
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ch <- prometheus.MustNewConstMetric(
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metricErrorCount, prometheus.CounterValue, float64(e.dbErrorCount), "db",
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)
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ch <- prometheus.MustNewConstMetric(
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metricErrorCount, prometheus.CounterValue, float64(e.socketConnectionErrorCount), "socket_conn",
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)
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ch <- prometheus.MustNewConstMetric(
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metricErrorCount, prometheus.CounterValue, float64(e.socketRequestErrorCount), "socket_req",
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)
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}
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func (e *Exporter) collectServerUpMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
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var serverUp float64 = 0
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if s != nil {
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pingSuccess, err := s.Ping()
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if err != nil {
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e.socketRequestErrorCount++
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log.Print(err)
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}
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if err == nil && pingSuccess {
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serverUp = 1
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}
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}
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ch <- prometheus.MustNewConstMetric(
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metricServerUp, prometheus.GaugeValue, serverUp,
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)
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}
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func (e *Exporter) collectJailMetrics(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
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jails, err := s.GetJails()
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var count float64 = 0
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if err != nil {
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e.socketRequestErrorCount++
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log.Print(err)
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}
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if err == nil {
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count = float64(len(jails))
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}
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ch <- prometheus.MustNewConstMetric(
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metricJailCount, prometheus.GaugeValue, count,
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)
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for i := range jails {
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e.collectJailStatsMetric(ch, s, jails[i])
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}
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}
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func (e *Exporter) collectJailStatsMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket, jail string) {
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stats, err := s.GetJailStats(jail)
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if err != nil {
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e.socketRequestErrorCount++
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log.Printf("failed to get stats for jail %s: %v", jail, err)
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return
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}
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ch <- prometheus.MustNewConstMetric(
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metricJailFailedCurrent, prometheus.GaugeValue, float64(stats.FailedCurrent), jail,
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)
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ch <- prometheus.MustNewConstMetric(
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metricJailFailedTotal, prometheus.GaugeValue, float64(stats.FailedTotal), jail,
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)
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ch <- prometheus.MustNewConstMetric(
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metricJailBannedCurrent, prometheus.GaugeValue, float64(stats.BannedCurrent), jail,
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)
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ch <- prometheus.MustNewConstMetric(
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metricJailBannedTotal, prometheus.GaugeValue, float64(stats.BannedTotal), jail,
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)
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}
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func (e *Exporter) collectVersionMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
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var err error
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var fail2banVersion = ""
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if s != nil {
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fail2banVersion, err = s.GetServerVersion()
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if err != nil {
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e.socketRequestErrorCount++
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log.Printf("failed to get fail2ban server version: %v", err)
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}
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}
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ch <- prometheus.MustNewConstMetric(
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metricVersionInfo, prometheus.GaugeValue, float64(1), e.exporterVersion, fail2banVersion,
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)
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}
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289
src/exporter.go
289
src/exporter.go
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@ -2,8 +2,7 @@ package main
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import (
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"fail2ban-prometheus-exporter/cfg"
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fail2banDb "fail2ban-prometheus-exporter/db"
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"fail2ban-prometheus-exporter/socket"
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"fail2ban-prometheus-exporter/export"
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"fmt"
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"log"
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"net/http"
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@ -13,290 +12,13 @@ import (
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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const (
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deprecatedNamespace = "fail2ban"
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namespace = "f2b"
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)
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var (
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version = "dev"
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commit = "none"
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date = "unknown"
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builtBy = "unknown"
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deprecatedMetricUp = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "up"),
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"(Deprecated) Was the last fail2ban query successful.",
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nil, nil,
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)
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deprecatedMetricBannedIpsPerJail = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "banned_ips"),
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"(Deprecated) Number of banned IPs stored in the database (per jail).",
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[]string{"jail"}, nil,
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)
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deprecatedMetricBadIpsPerJail = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "bad_ips"),
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"(Deprecated) 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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deprecatedMetricEnabledJails = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "enabled_jails"),
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"(Deprecated) Enabled jails.",
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[]string{"jail"}, nil,
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)
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deprecatedMetricErrorCount = prometheus.NewDesc(
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prometheus.BuildFQName(deprecatedNamespace, "", "errors"),
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"(Deprecated) Number of errors found since startup.",
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[]string{"type"}, nil,
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)
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metricErrorCount = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "errors"),
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"Number of errors found since startup",
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[]string{"type"}, nil,
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)
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metricServerUp = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "up"),
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"Check if the fail2ban server is up",
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nil, nil,
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)
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metricJailCount = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_count"),
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"Number of defined jails",
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nil, nil,
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)
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metricJailFailedCurrent = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_failed_current"),
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"Number of current failures on this jail's filter",
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[]string{"jail"}, nil,
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)
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metricJailFailedTotal = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_failed_total"),
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"Number of total failures on this jail's filter",
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[]string{"jail"}, nil,
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)
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metricJailBannedCurrent = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_banned_current"),
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"Number of IPs currently banned in this jail",
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[]string{"jail"}, nil,
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)
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metricJailBannedTotal = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "jail_banned_total"),
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"Total number of IPs banned by this jail (includes expired bans)",
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[]string{"jail"}, nil,
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)
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metricVersionInfo = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, "", "version"),
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"Version of the exporter and fail2ban server",
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[]string{"exporter", "fail2ban"}, nil,
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)
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)
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type Exporter struct {
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db *fail2banDb.Fail2BanDB
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socketPath string
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lastError error
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dbErrorCount int
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socketConnectionErrorCount int
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socketRequestErrorCount int
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}
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func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
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if e.db != nil {
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ch <- deprecatedMetricUp
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ch <- deprecatedMetricBadIpsPerJail
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ch <- deprecatedMetricBannedIpsPerJail
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ch <- deprecatedMetricEnabledJails
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ch <- deprecatedMetricErrorCount
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}
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if e.socketPath != "" {
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ch <- metricServerUp
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ch <- metricJailCount
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ch <- metricJailFailedCurrent
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ch <- metricJailFailedTotal
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ch <- metricJailBannedCurrent
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ch <- metricJailBannedTotal
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}
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ch <- metricErrorCount
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}
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func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
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if e.db != nil {
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e.collectDeprecatedBadIpsPerJailMetrics(ch)
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e.collectDeprecatedBannedIpsPerJailMetrics(ch)
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e.collectDeprecatedEnabledJailMetrics(ch)
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e.collectDeprecatedUpMetric(ch)
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e.collectDeprecatedErrorCountMetric(ch)
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}
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if e.socketPath != "" {
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s, err := socket.ConnectToSocket(e.socketPath)
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if err != nil {
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log.Printf("error opening socket: %v", err)
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e.socketConnectionErrorCount++
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} else {
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defer s.Close()
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}
|
||||
e.collectServerUpMetric(ch, s)
|
||||
if err == nil && s != nil {
|
||||
e.collectJailMetrics(ch, s)
|
||||
}
|
||||
e.collectVersionMetric(ch, s)
|
||||
} else {
|
||||
e.collectVersionMetric(ch, nil)
|
||||
}
|
||||
e.collectErrorCountMetric(ch)
|
||||
}
|
||||
|
||||
func (e *Exporter) collectDeprecatedUpMetric(ch chan<- prometheus.Metric) {
|
||||
var upMetricValue float64 = 1
|
||||
if e.lastError != nil {
|
||||
upMetricValue = 0
|
||||
}
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
deprecatedMetricUp, prometheus.GaugeValue, upMetricValue,
|
||||
)
|
||||
}
|
||||
|
||||
func (e *Exporter) collectDeprecatedErrorCountMetric(ch chan<- prometheus.Metric) {
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
deprecatedMetricErrorCount, prometheus.CounterValue, float64(e.dbErrorCount), "db",
|
||||
)
|
||||
}
|
||||
|
||||
func (e *Exporter) collectDeprecatedBadIpsPerJailMetrics(ch chan<- prometheus.Metric) {
|
||||
jailNameToCountMap, err := e.db.CountBadIpsPerJail()
|
||||
e.lastError = err
|
||||
|
||||
if err != nil {
|
||||
e.dbErrorCount++
|
||||
log.Print(err)
|
||||
}
|
||||
|
||||
for jailName, count := range jailNameToCountMap {
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
deprecatedMetricBadIpsPerJail, prometheus.GaugeValue, float64(count), jailName,
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
func (e *Exporter) collectDeprecatedBannedIpsPerJailMetrics(ch chan<- prometheus.Metric) {
|
||||
jailNameToCountMap, err := e.db.CountBannedIpsPerJail()
|
||||
e.lastError = err
|
||||
|
||||
if err != nil {
|
||||
e.dbErrorCount++
|
||||
log.Print(err)
|
||||
}
|
||||
|
||||
for jailName, count := range jailNameToCountMap {
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
deprecatedMetricBannedIpsPerJail, prometheus.GaugeValue, float64(count), jailName,
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
func (e *Exporter) collectDeprecatedEnabledJailMetrics(ch chan<- prometheus.Metric) {
|
||||
jailNameToEnabledMap, err := e.db.JailNameToEnabledValue()
|
||||
e.lastError = err
|
||||
|
||||
if err != nil {
|
||||
e.dbErrorCount++
|
||||
log.Print(err)
|
||||
}
|
||||
|
||||
for jailName, count := range jailNameToEnabledMap {
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
deprecatedMetricEnabledJails, prometheus.GaugeValue, float64(count), jailName,
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
func (e *Exporter) collectErrorCountMetric(ch chan<- prometheus.Metric) {
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricErrorCount, prometheus.CounterValue, float64(e.dbErrorCount), "db",
|
||||
)
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricErrorCount, prometheus.CounterValue, float64(e.socketConnectionErrorCount), "socket_conn",
|
||||
)
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricErrorCount, prometheus.CounterValue, float64(e.socketRequestErrorCount), "socket_req",
|
||||
)
|
||||
}
|
||||
|
||||
func (e *Exporter) collectServerUpMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
|
||||
var serverUp float64 = 0
|
||||
if s != nil {
|
||||
pingSuccess, err := s.Ping()
|
||||
if err != nil {
|
||||
e.socketRequestErrorCount++
|
||||
log.Print(err)
|
||||
}
|
||||
if err == nil && pingSuccess {
|
||||
serverUp = 1
|
||||
}
|
||||
}
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricServerUp, prometheus.GaugeValue, serverUp,
|
||||
)
|
||||
}
|
||||
|
||||
func (e *Exporter) collectJailMetrics(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
|
||||
jails, err := s.GetJails()
|
||||
var count float64 = 0
|
||||
if err != nil {
|
||||
e.socketRequestErrorCount++
|
||||
log.Print(err)
|
||||
}
|
||||
if err == nil {
|
||||
count = float64(len(jails))
|
||||
}
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricJailCount, prometheus.GaugeValue, count,
|
||||
)
|
||||
|
||||
for i := range jails {
|
||||
e.collectJailStatsMetric(ch, s, jails[i])
|
||||
}
|
||||
}
|
||||
|
||||
func (e *Exporter) collectJailStatsMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket, jail string) {
|
||||
stats, err := s.GetJailStats(jail)
|
||||
if err != nil {
|
||||
e.socketRequestErrorCount++
|
||||
log.Printf("failed to get stats for jail %s: %v", jail, err)
|
||||
return
|
||||
}
|
||||
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricJailFailedCurrent, prometheus.GaugeValue, float64(stats.FailedCurrent), jail,
|
||||
)
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricJailFailedTotal, prometheus.GaugeValue, float64(stats.FailedTotal), jail,
|
||||
)
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricJailBannedCurrent, prometheus.GaugeValue, float64(stats.BannedCurrent), jail,
|
||||
)
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricJailBannedTotal, prometheus.GaugeValue, float64(stats.BannedTotal), jail,
|
||||
)
|
||||
}
|
||||
|
||||
func (e *Exporter) collectVersionMetric(ch chan<- prometheus.Metric, s *socket.Fail2BanSocket) {
|
||||
var err error
|
||||
var fail2banVersion = ""
|
||||
if s != nil {
|
||||
fail2banVersion, err = s.GetServerVersion()
|
||||
if err != nil {
|
||||
e.socketRequestErrorCount++
|
||||
log.Printf("failed to get fail2ban server version: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
ch <- prometheus.MustNewConstMetric(
|
||||
metricVersionInfo, prometheus.GaugeValue, float64(1), version, fail2banVersion,
|
||||
)
|
||||
}
|
||||
|
||||
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)
|
||||
|
|
@ -309,14 +31,7 @@ func main() {
|
|||
} else {
|
||||
log.Print("starting fail2ban exporter")
|
||||
|
||||
exporter := &Exporter{}
|
||||
if appSettings.Fail2BanDbPath != "" {
|
||||
log.Print("database-based metrics have been deprecated and will be removed in a future release")
|
||||
exporter.db = fail2banDb.MustConnectToDb(appSettings.Fail2BanDbPath)
|
||||
}
|
||||
if appSettings.Fail2BanSocketPath != "" {
|
||||
exporter.socketPath = appSettings.Fail2BanSocketPath
|
||||
}
|
||||
exporter := export.NewExporter(appSettings, version)
|
||||
prometheus.MustRegister(exporter)
|
||||
|
||||
http.Handle("/metrics", promhttp.Handler())
|
||||
|
|
|
|||
Loading…
Reference in a new issue