Plan independent BFF and adapt selected Sendico foundations (#34)

backend/cmd/bff/main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"log/slog"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"git.sendico.io/tech/sxchnge/bff/internal/httpapi"
+)
+
+func main() {
+	if err := run(); err != nil {
+		slog.Error("BFF stopped", "error", err)
+		os.Exit(1)
+	}
+}
+
+func run() error {
+	addr := os.Getenv("SXCHNGE_HTTP_ADDR")
+	if addr == "" {
+		addr = "127.0.0.1:8082"
+	}
+	server := &http.Server{Addr: addr, Handler: httpapi.New(), ReadHeaderTimeout: 5 * time.Second, ReadTimeout: 15 * time.Second, WriteTimeout: 15 * time.Second, IdleTimeout: 60 * time.Second, MaxHeaderBytes: 1 << 20}
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+	failures := make(chan error, 1)
+	go func() { failures <- server.ListenAndServe() }()
+	slog.Info("BFF operational shell starting", "address", addr, "provider_configured", false)
+	select {
+	case err := <-failures:
+		if errors.Is(err, http.ErrServerClosed) {
+			return nil
+		}
+		return err
+	case <-ctx.Done():
+		shutdown, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+		defer cancel()
+		slog.Info("BFF shutting down")
+		return server.Shutdown(shutdown)
+	}
+}