move config parsing into the shared package

backend/backend.go

@@ -41,5 +41,5 @@ func (b *Backend) Run() error {
 		}
 	})
 
-	return r.Run(b.config.BackendListen)
+	return r.Run(b.config.ListenBackend)
 }

ddns.go

@@ -1,56 +1,21 @@
 package main
 
 import (
-	"flag"
 	"github.com/pboehm/ddns/backend"
 	"github.com/pboehm/ddns/frontend"
 	"github.com/pboehm/ddns/shared"
 	"golang.org/x/sync/errgroup"
 	"log"
-	"strings"
 )
 
 var serviceConfig *shared.Config = &shared.Config{}
 
 func init() {
-	flag.StringVar(&serviceConfig.Domain, "domain", "",
-		"The subdomain which should be handled by DDNS")
-
-	flag.StringVar(&serviceConfig.SOAFqdn, "soa_fqdn", "",
-		"The FQDN of the DNS server which is returned as a SOA record")
-
-	flag.StringVar(&serviceConfig.BackendListen, "listen-backend", ":8057",
-		"Which socket should the backend web service use to bind itself")
-
-	flag.StringVar(&serviceConfig.FrontendListen, "listen-frontend", ":8080",
-		"Which socket should the frontend web service use to bind itself")
-
-	flag.StringVar(&serviceConfig.RedisHost, "redis", ":6379",
-		"The Redis socket that should be used")
-
-	flag.IntVar(&serviceConfig.HostExpirationDays, "expiration-days", 10,
-		"The number of days after a host is released when it is not updated")
-
-	flag.BoolVar(&serviceConfig.Verbose, "verbose", false,
-		"Be more verbose")
-}
-
-func validateCommandArgs() {
-	if serviceConfig.Domain == "" {
-		log.Fatal("You have to supply the domain via --domain=DOMAIN")
-	} else if !strings.HasPrefix(serviceConfig.Domain, ".") {
-		// get the domain in the right format
-		serviceConfig.Domain = "." + serviceConfig.Domain
-	}
-
-	if serviceConfig.SOAFqdn == "" {
-		log.Fatal("You have to supply the server FQDN via --soa_fqdn=FQDN")
-	}
+	serviceConfig.Initialize()
 }
 
 func main() {
-	flag.Parse()
-	validateCommandArgs()
+	serviceConfig.Validate()
 
 	redis := shared.NewRedisBackend(serviceConfig)
 	defer redis.Close()

frontend/frontend.go

@@ -121,7 +121,7 @@ func (f *Frontend) Run() error {
 		})
 	})
 
-	return r.Run(f.config.FrontendListen)
+	return r.Run(f.config.ListenFrontend)
 }
 
 // Get the Remote Address of the client. At First we try to get the

shared/config.go

@@ -1,11 +1,55 @@
 package shared
 
+import (
+	"flag"
+	"log"
+	"strings"
+)
+
 type Config struct {
 	Verbose            bool
 	Domain             string
 	SOAFqdn            string
 	HostExpirationDays int
-	FrontendListen     string
-	BackendListen      string
+	ListenFrontend     string
+	ListenBackend      string
 	RedisHost          string
 }
+
+func (c *Config) Initialize() {
+	flag.StringVar(&c.Domain, "domain", "",
+		"The subdomain which should be handled by DDNS")
+
+	flag.StringVar(&c.SOAFqdn, "soa_fqdn", "",
+		"The FQDN of the DNS server which is returned as a SOA record")
+
+	flag.StringVar(&c.ListenBackend, "listen-backend", ":8057",
+		"Which socket should the backend web service use to bind itself")
+
+	flag.StringVar(&c.ListenFrontend, "listen-frontend", ":8080",
+		"Which socket should the frontend web service use to bind itself")
+
+	flag.StringVar(&c.RedisHost, "redis", ":6379",
+		"The Redis socket that should be used")
+
+	flag.IntVar(&c.HostExpirationDays, "expiration-days", 10,
+		"The number of days after a host is released when it is not updated")
+
+	flag.BoolVar(&c.Verbose, "verbose", false,
+		"Be more verbose")
+}
+
+func (c *Config) Validate() {
+	flag.Parse()
+
+	if c.Domain == "" {
+		log.Fatal("You have to supply the domain via --domain=DOMAIN")
+	} else if !strings.HasPrefix(c.Domain, ".") {
+		// get the domain in the right format
+		c.Domain = "." + c.Domain
+	}
+
+	if c.SOAFqdn == "" {
+		log.Fatal("You have to supply the server FQDN via --soa_fqdn=FQDN")
+	}
+}