config: writing how the config file should look

cmd/kdhcpd/main.go

@@ -1,36 +1,34 @@
 package main
 
 import (
+	"context"
 	"flag"
+	"os"
 
+	"git.wntrmute.dev/kyle/kdhcp/bazel-kdhcp/external/com_github_davecgh_go_spew/spew"
+	"git.wntrmute.dev/kyle/kdhcp/config"
 	"git.wntrmute.dev/kyle/kdhcp/log"
-	"git.wntrmute.dev/kyle/kdhcp/server"
-	"github.com/davecgh/go-spew/spew"
+	"github.com/peterbourgon/ff/v3/ffcli"
 )
 
 func main() {
-	cfg := server.DefaultConfig()
-	var level, tag string
-	flag.StringVar(&level, "l", "DEBUG", "log level") // TODO(kyle): change this warning later
-	flag.IntVar(&cfg.Port, "p", cfg.Port, "port to listen on")
-	flag.StringVar(&tag, "t", "kdhcpd", "logging tag")
+	var configPath string
+
+	flag.StringVar(&configPath, "f", "kdhcpd.yaml", "path to `config file`")
 	flag.Parse()
 
-	log.Setup(level, tag)
+	root := &ffcli.Command{
+		Exec: func(ctx context.Context, args []string) error {
+			cfg, err := config.Load(configPath)
+			if err != nil {
+				log.Fatal(err)
+			}
 
-	srv, err := server.NewServer(cfg)
-	if err != nil {
-		log.Fatal(err)
+			log.Debugf("read configuration file with version=%d", cfg.Version)
+			spew.Dump(*cfg)
+			return nil
+		},
 	}
 
-	for {
-		packet, err := srv.ReadFrom()
-		if err != nil {
-			log.Warning(err)
-			continue
-		}
-
-		log.Debugf("receive %d byte packet from %s", len(packet.Data), packet.Addr)
-		spew.Dump(packet.Data)
-	}
+	root.ParseAndRun(context.Background(), os.Args[1:])
 }