Phase 1 MVP — echo bot factory

main.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+const defaultListenAddr = ":8080"
+const defaultConfigPath = "/etc/homelab-gateway/bots.yaml"
+
+func main() {
+	subcmd := ""
+	if len(os.Args) > 1 && os.Args[1] != "" && os.Args[1][0] != '-' {
+		subcmd = os.Args[1]
+		os.Args = append([]string{os.Args[0]}, os.Args[2:]...)
+	}
+
+	switch subcmd {
+	case "setwebhook":
+		runSetWebhook()
+	case "deletewebhook":
+		runDeleteWebhook()
+	case "", "serve":
+		runServer()
+	default:
+		log.Fatalf("unknown subcommand: %s (expected: serve | setwebhook | deletewebhook)", subcmd)
+	}
+}
+
+func runServer() {
+	addr := flag.String("addr", envOr("LISTEN_ADDR", defaultListenAddr), "listen address")
+	configPath := flag.String("config", envOr("CONFIG_PATH", defaultConfigPath), "bot routing config (YAML)")
+	flag.Parse()
+
+	cfg, err := LoadConfig(*configPath)
+	if err != nil {
+		log.Fatalf("load config: %v", err)
+	}
+
+	registry, err := NewRegistry(cfg)
+	if err != nil {
+		log.Fatalf("build registry: %v", err)
+	}
+
+	srv := &http.Server{
+		Addr:              *addr,
+		Handler:           NewServer(registry).Routes(),
+		ReadHeaderTimeout: 5 * time.Second,
+		ReadTimeout:       30 * time.Second,
+		WriteTimeout:      30 * time.Second,
+		IdleTimeout:       60 * time.Second,
+	}
+
+	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
+	defer stop()
+
+	go func() {
+		log.Printf("homelab-gateway listening on %s (%d bot(s) loaded)", *addr, registry.Count())
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			log.Fatalf("server: %v", err)
+		}
+	}()
+
+	<-ctx.Done()
+	log.Print("shutdown signal received, draining...")
+	shutdownCtx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+	if err := srv.Shutdown(shutdownCtx); err != nil {
+		log.Printf("graceful shutdown error: %v", err)
+	}
+	log.Print("bye")
+}
+
+func envOr(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}