initial webapp

cmd/any2anexoj-web/main.go

@@ -0,0 +1,85 @@
+package main
+
+import (
+	"context"
+	"embed"
+	"errors"
+	"io/fs"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/nmoniz/any2anexoj/internal/web"
+)
+
+//go:embed all:static
+var staticFS embed.FS
+
+func main() {
+	if err := run(); err != nil {
+		slog.Error("any2anexoj-web: fatal error", slog.Any("err", err))
+		os.Exit(1)
+	}
+}
+
+// run wires up the server, installs signal-driven cancellation, and blocks on
+// the HTTP server until it stops. It is split out from main so tests can drive
+// the same code paths if needed.
+func run() error {
+	addr := os.Getenv("PORT")
+	if addr == "" {
+		addr = ":8080"
+	}
+	// A bare "8080" value is friendlier than the net.Listen-style ":8080".
+	if addr[0] != ':' {
+		addr = ":" + addr
+	}
+
+	// Sub-mount the embedded FS so the static subtree is rooted at "" inside
+	// the web package (matches /static/...).
+	staticSub, err := fs.Sub(staticFS, "static")
+	if err != nil {
+		return err
+	}
+
+	state := web.NewState()
+	srv, err := web.NewServer(state, staticSub)
+	if err != nil {
+		return err
+	}
+
+	httpServer := &http.Server{
+		Addr:              addr,
+		Handler:           srv.Handler(),
+		ReadHeaderTimeout: 10 * time.Second,
+	}
+
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Kill, os.Interrupt, syscall.SIGTERM)
+	defer cancel()
+
+	errCh := make(chan error, 1)
+	go func() {
+		slog.Info("any2anexoj-web: listening", slog.String("addr", addr))
+		if err := httpServer.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+			errCh <- err
+			return
+		}
+		errCh <- nil
+	}()
+
+	select {
+	case <-ctx.Done():
+		slog.Info("any2anexoj-web: shutting down")
+		shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer shutdownCancel()
+		if err := httpServer.Shutdown(shutdownCtx); err != nil {
+			return err
+		}
+		return nil
+	case err := <-errCh:
+		return err
+	}
+}