volker.raschek/prometheus-fail2ban-exporter
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refactor: move server setup code to new package (!90)

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* Move code setting up the HTTP server to it's own package
* This helps clean up the `main` function and make it easier to read
* Rename the `BasicAuthMiddleware` to remove reference to Basic since it can now handle any type of auth type

https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/merge_requests/90
This commit is contained in:
Hector 2023-06-21 10:58:43 +00:00
parent 41b05f7e16
commit 11c4b26c0b
5 changed files with 72 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
exporter.go
View File

@ -3,23 +3,17 @@ package main
import (
"fmt"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/f2b"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/server"
)
const (
metricsPath = "/metrics"
)
var (
version = "dev"
commit = "none"
@ -32,26 +26,6 @@ func printAppVersion() {
fmt.Printf(" build date: %s\r\n commit hash: %s\r\n built by: %s\r\n", date, commit, builtBy)
}
func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte(
`<html>
<head><title>Fail2Ban Exporter</title></head>
<body>
<h1>Fail2Ban Exporter</h1>
<p><a href="` + metricsPath + `">Metrics</a></p>
</body>
</html>`))
if err != nil {
log.Printf("error handling root url: %v", err)
w.WriteHeader(http.StatusInternalServerError)
}
}
func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
promhttp.Handler().ServeHTTP(w, r)
collector.WriteTextFileMetrics(w, r)
}
func main() {
appSettings := cfg.Parse()
if appSettings.VersionMode {
@ -67,21 +41,7 @@ func main() {
textFileCollector := textfile.NewCollector(appSettings)
prometheus.MustRegister(textFileCollector)
http.HandleFunc("/", server.BasicAuthMiddleware(rootHtmlHandler, appSettings.AuthProvider))
http.HandleFunc(metricsPath, server.BasicAuthMiddleware(
func(w http.ResponseWriter, r *http.Request) {
metricHandler(w, r, textFileCollector)
},
appSettings.AuthProvider,
))
log.Printf("metrics available at '%s'", metricsPath)
svrErr := make(chan error)
go func() {
svrErr <- http.ListenAndServe(appSettings.MetricsAddress, nil)
}()
log.Print("ready")
svrErr := server.StartServer(appSettings, textFileCollector)
err := <-svrErr
log.Fatal(err)
}

2
server/middleware.go → server/auth.go
View File

@ -6,7 +6,7 @@ import (
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
)
func BasicAuthMiddleware(handlerFunc http.HandlerFunc, authProvider auth.AuthProvider) http.HandlerFunc {
func AuthMiddleware(handlerFunc http.HandlerFunc, authProvider auth.AuthProvider) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if authProvider.IsAllowed(r) {
handlerFunc.ServeHTTP(w, r)

8
server/middleware_test.go → server/auth_test.go
View File

@ -18,13 +18,13 @@ func newTestRequest() *http.Request {
return httptest.NewRequest(http.MethodGet, "http://example.com", nil)
}
func executeBasicAuthMiddlewareTest(t *testing.T, authMatches bool, expectedCode int, expectedCallCount int) {
func executeAuthMiddlewareTest(t *testing.T, authMatches bool, expectedCode int, expectedCallCount int) {
callCount := 0
testHandler := func(w http.ResponseWriter, r *http.Request) {
callCount++
}
handler := BasicAuthMiddleware(testHandler, testAuthProvider{match: authMatches})
handler := AuthMiddleware(testHandler, testAuthProvider{match: authMatches})
recorder := httptest.NewRecorder()
request := newTestRequest()
handler.ServeHTTP(recorder, request)
@ -38,9 +38,9 @@ func executeBasicAuthMiddlewareTest(t *testing.T, authMatches bool, expectedCode
}
func Test_GIVEN_MatchingBasicAuth_WHEN_MethodCalled_THEN_RequestProcessed(t *testing.T) {
executeBasicAuthMiddlewareTest(t, true, http.StatusOK, 1)
executeAuthMiddlewareTest(t, true, http.StatusOK, 1)
}
func Test_GIVEN_NonMatchingBasicAuth_WHEN_MethodCalled_THEN_RequestRejected(t *testing.T) {
executeBasicAuthMiddlewareTest(t, false, http.StatusUnauthorized, 0)
executeAuthMiddlewareTest(t, false, http.StatusUnauthorized, 0)
}

33
server/handler.go Normal file
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@ -0,0 +1,33 @@
package server
import (
"log"
"net/http"
"github.com/prometheus/client_golang/prometheus/promhttp"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
)
const (
metricsPath = "/metrics"
)
func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte(
`<html>
<head><title>Fail2Ban Exporter</title></head>
<body>
<h1>Fail2Ban Exporter</h1>
<p><a href="` + metricsPath + `">Metrics</a></p>
</body>
</html>`))
if err != nil {
log.Printf("error handling root url: %v", err)
w.WriteHeader(http.StatusInternalServerError)
}
}
func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
promhttp.Handler().ServeHTTP(w, r)
collector.WriteTextFileMetrics(w, r)
}

33
server/server.go Normal file
View File

@ -0,0 +1,33 @@
package server
import (
"log"
"net/http"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
)
func StartServer(
appSettings *cfg.AppSettings,
textFileCollector *textfile.Collector,
) chan error {
http.HandleFunc("/", AuthMiddleware(
rootHtmlHandler,
appSettings.AuthProvider,
))
http.HandleFunc(metricsPath, AuthMiddleware(
func(w http.ResponseWriter, r *http.Request) {
metricHandler(w, r, textFileCollector)
},
appSettings.AuthProvider,
))
log.Printf("metrics available at '%s'", metricsPath)
svrErr := make(chan error)
go func() {
svrErr <- http.ListenAndServe(appSettings.MetricsAddress, nil)
}()
log.Print("ready")
return svrErr
}