✨ Enhance NATS configuration and error handling. Introduce stream limits and consumer rules in configuration files. Refactor message processing to handle permanent errors. Update README and development configuration to reflect changes. Add tests for new error handling mechanisms.

cmd/main/main.go

@@ -3,10 +3,12 @@ package main
 import (
 	"caatsm/pkg/di"
 	"context"
+	"errors"
 	"fmt"
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
 	"github.com/urfave/cli/v2"
 )
@@ -39,7 +41,7 @@ func setupApp() *cli.App {
 						Name:    "topic",
 						Aliases: []string{"t"},
 						Usage:   "Nats topic to listen to",
-						Value:   "Telegram.Serial",
+						Value:   "telegram.serial",
 						EnvVars: []string{"NATS_SUBJECT"},
 					},
 				},
@@ -72,18 +74,38 @@ func executeListen(c *cli.Context) error {
 		}
 	}()
 
+	var runErr error
+
 	// Wait for signal or error
 	select {
 	case sig := <-sigChan:
 		fmt.Printf("Received signal: %v, shutting down...\n", sig)
 		cancel()
 	case err := <-errChan:
-		return err
+		cancel()
+		if err != nil && !errors.Is(err, context.Canceled) {
+			runErr = err
+		}
+	}
+
+	waitTimeout := 5 * time.Second
+	select {
+	case err := <-errChan:
+		if err != nil && !errors.Is(err, context.Canceled) {
+			runErr = err
+		}
+	case <-time.After(waitTimeout):
+		fmt.Printf("Timed out waiting for consumer shutdown after %s\n", waitTimeout)
+	}
+
+	if err := consumer.Shutdown(context.Background()); err != nil {
+		if runErr == nil {
+			runErr = fmt.Errorf("failed to drain NATS connection: %w", err)
+		}
 	}
 
 	// Note: processor is initialized but not directly used here
-	// It's used by the consumer internally
 	_ = processor
 
-	return nil
+	return runErr
 }