Refactor - now wireguard based. (#7)

cmd/vppn/main.go

@@ -1,11 +1,72 @@
 package main
 
 import (
+	"flag"
 	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
 	"vppn/peer"
+
+	"git.crumpington.com/lib/go/flock"
 )
 
 func main() {
 	log.SetFlags(0)
-	peer.Main2()
+
+	name := flag.String("name", "", "network name (required)")
+	hub := flag.String("hub", "", "hub base URL (required)")
+	flag.Parse()
+
+	if *name == "" || *hub == "" {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	apiKey, err := loadAPIKey(*name)
+	if err != nil {
+		log.Fatalf("api key: %v", err)
+	}
+
+	// Directory existence is guaranteed by the apikey file read above.
+	lockFile, err := flock.TryLock(vppnPath(*name, "lock"))
+	if err != nil {
+		log.Fatalf("lock: %v", err)
+	}
+	if lockFile == nil {
+		log.Fatalf("already running for network %q", *name)
+	}
+	defer flock.Unlock(lockFile)
+
+	state, err := peer.LoadOrInit(vppnPath(*name, "state.json"), *hub, apiKey)
+	if err != nil {
+		log.Fatalf("init: %v", err)
+	}
+
+	ifaceName := strings.TrimSuffix(state.LocalDomain, ".local")
+	app, err := peer.New(state, *hub, apiKey, ifaceName, state.LocalDomain, vppnPath(*name, "network.json"))
+	if err != nil {
+		log.Fatalf("start: %v", err)
+	}
+
+	if err := app.Run(); err != nil {
+		log.Fatalf("run: %v", err)
+	}
+}
+
+func loadAPIKey(name string) (string, error) {
+	data, err := os.ReadFile(vppnPath(name, "apikey"))
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(data)), nil
+}
+
+func vppnPath(name, file string) string {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return filepath.Join(".vppn", name, file)
+	}
+	return filepath.Join(home, ".vppn", name, file)
 }