✨ 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.

internal/infra/nats/jetstream.go

@@ -3,14 +3,14 @@ package nats
 import (
 	"caatsm/internal/infra/config"
 	"fmt"
-	"go.uber.org/zap"
+	"strings"
+
 	"github.com/nats-io/nats.go"
-	"time"
+	"go.uber.org/zap"
 )
 
-// ProvideJetStream creates a NATS JetStream connection
-func ProvideJetStream(cfg *config.Config, logger *zap.Logger) (nats.JetStreamContext, error) {
-	// Connect to NATS
+// ProvideNATSConn creates a reusable NATS connection.
+func ProvideNATSConn(cfg *config.Config, logger *zap.Logger) (*nats.Conn, error) {
 	nc, err := nats.Connect(
 		cfg.NATS.URL,
 		nats.RetryOnFailedConnect(true),
@@ -29,6 +29,11 @@ func ProvideJetStream(cfg *config.Config, logger *zap.Logger) (nats.JetStreamCon
 		return nil, fmt.Errorf("failed to connect to NATS: %w", err)
 	}
 
+	return nc, nil
+}
+
+// ProvideJetStream creates a NATS JetStream context using an existing connection.
+func ProvideJetStream(nc *nats.Conn, cfg *config.Config, logger *zap.Logger) (nats.JetStreamContext, error) {
 	// Get JetStream context
 	js, err := nc.JetStream()
 	if err != nil {
@@ -43,13 +48,30 @@ func ProvideJetStream(cfg *config.Config, logger *zap.Logger) (nats.JetStreamCon
 		subject = "telegram.>"
 	}
 
+	streamLimits := cfg.NATS.StreamLimits
+	storage := nats.FileStorage
+	switch strings.ToLower(streamLimits.Storage) {
+	case "memory":
+		storage = nats.MemoryStorage
+	case "file":
+		storage = nats.FileStorage
+	}
+
+	discard := nats.DiscardOld
+	if strings.EqualFold(streamLimits.Discard, "new") {
+		discard = nats.DiscardNew
+	}
+
 	streamConfig := &nats.StreamConfig{
 		Name:      streamName,
 		Subjects:  []string{subject},
 		Retention: nats.LimitsPolicy,
-		MaxAge:    24 * time.Hour,
-		Storage:   nats.FileStorage,
-		Replicas:  1,
+		MaxMsgs:   streamLimits.MaxMsgs,
+		MaxBytes:  streamLimits.MaxBytes,
+		MaxAge:    streamLimits.MaxAge,
+		Discard:   discard,
+		Storage:   storage,
+		Replicas:  streamLimits.Replicas,
 	}
 
 	_, err = js.AddStream(streamConfig)