refactor: Split large main file

config.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"github.com/alecthomas/kingpin/v2"
+)
+
+type configuration struct {
+	casDirectory             string
+	applicationListenAddress string
+	metricsListenAddress     string
+}
+
+func parseConfiguration(args []string) *configuration {
+	config := &configuration{}
+	app := kingpin.New("ocspcrl", "OCSP responder / CRL server (multi-CA)")
+	app.HelpFlag.Short('h')
+	app.Flag("cas-directory", "Path to a directory containing one subdirectory per CA. Each subdirectory must contain ca.crt, responder.crt, key.pem and crl.pem. The subdirectory name is used as the route prefix.").
+		Envar("CAS_DIRECTORY").Required().ExistingDirVar(&config.casDirectory)
+	app.Flag("web.listen-address", "Address for application endpoint").
+		Envar("WEB_LISTEN_ADDRESS").Default(":8080").StringVar(&config.applicationListenAddress)
+	app.Flag("metrics.listen-address", "Address for metrics endpoint").
+		Envar("METRICS_LISTEN_ADDRESS").Default("[::1]:8081").StringVar(&config.metricsListenAddress)
+	kingpin.MustParse(app.Parse(args))
+	return config
+}