update handler (#2)

* 🔧 Remove commented-out regex patterns and initialization in config.

* ✨ Add NATS message publisher with configuration 📩🚀

* ✨ Add new PlainTextMarshaler and refactor handler in nats package.

internal/config/config.go

@@ -15,6 +15,7 @@ var MyConfig *Config
 type Config struct {
 	Nats         NatsConfig
 	Subscription SubscriptionConfig
+	Publisher    PublisherConfig
 	Timeouts     TimeoutsConfig
 	Hasura       HasuraConfig
 }
@@ -30,6 +31,10 @@ type SubscriptionConfig struct {
 	QueueGroup string `mapstructure:"queue_group"`
 }
 
+type PublisherConfig struct {
+	Topic string `mapstructure:"topic"`
+}
+
 type TimeoutsConfig struct {
 	Server        time.Duration `mapstructure:"server"`
 	ReconnectWait time.Duration `mapstructure:"reconnect_wait"`

internal/nats/handler.go

@@ -1,4 +1,4 @@
-package handlers
+package nats
 
 import (
 	"caatsm/internal/config"
@@ -6,13 +6,11 @@ import (
 	"caatsm/internal/parsers"
 	"caatsm/internal/repository"
 	"caatsm/pkg/utils"
-	"errors"
 	"fmt"
 	"sync"
 
 	"github.com/ThreeDotsLabs/watermill"
 	"github.com/ThreeDotsLabs/watermill/message"
-	nc "github.com/nats-io/nats.go"
 )
 
 type MessageHandler struct {
@@ -44,6 +42,7 @@ func (handler *MessageHandler) HandleMessage(msg *message.Message) error {
 		log.Infof("parsed [%s]: %v\n", msg.UUID, parsed.ToString())
 	}
 	handler.SaveMessage(parsed, msg.UUID)
+	handler.Publish(parsed)
 	return nil
 }
 
@@ -57,16 +56,8 @@ func (n *MessageHandler) SaveMessage(parsed *domain.ParsedMessage, uuid string)
 	}
 }
 
-type PlainTextMarshaler struct{}
-
-func (m *PlainTextMarshaler) Marshal(topic string, msg nc.Msg) ([]byte, error) {
-	return msg.Data, nil
-}
-
-func (m *PlainTextMarshaler) Unmarshal(newMsg *nc.Msg) (*message.Message, error) {
-	if newMsg == nil {
-		return nil, errors.New("empty message")
+func (n *MessageHandler) Publish(parsed *domain.ParsedMessage) {
+	if err := Publish(n.config, parsed); err != nil {
+		utils.GetSugaredLogger().Error("error publishing message", err, map[string]interface{}{"message": parsed})
 	}
-	msg := message.NewMessage(watermill.NewUUID(), newMsg.Data)
-	return msg, nil
 }

internal/nats/pub.go

@@ -0,0 +1,48 @@
+package nats
+
+import (
+	"caatsm/internal/config"
+	"encoding/json"
+
+	"github.com/ThreeDotsLabs/watermill"
+	"github.com/ThreeDotsLabs/watermill-nats/v2/pkg/nats"
+	"github.com/ThreeDotsLabs/watermill/message"
+	nc "github.com/nats-io/nats.go"
+)
+
+func Publish(config *config.Config, parsedMessage interface{}) error {
+	logger := watermill.NewStdLogger(false, false)
+	options := []nc.Option{
+		nc.RetryOnFailedConnect(true),
+		nc.Timeout(config.Timeouts.Server),
+		nc.ReconnectWait(config.Timeouts.ReconnectWait),
+	}
+	jsConfig := nats.JetStreamConfig{Disabled: true}
+
+	publisher, err := nats.NewPublisher(
+		nats.PublisherConfig{
+			URL:         config.Nats.URL,
+			NatsOptions: options,
+			JetStream:   jsConfig,
+		},
+		logger,
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	logger.Info("NATS server connected", map[string]interface{}{"url": config.Nats.URL})
+	logger.Info("Publishing message to NATS topic", map[string]interface{}{"topic": config.Publisher.Topic})
+
+	messageText, err := json.Marshal(parsedMessage)
+	if err != nil {
+		logger.Error("Failed to marshal message", err, map[string]interface{}{"message": parsedMessage})
+	}
+	msg := message.NewMessage(watermill.NewUUID(), []byte(messageText))
+	err = publisher.Publish(config.Publisher.Topic, msg)
+	if err != nil {
+		logger.Error("Failed to publish message to NATS topic", err, map[string]interface{}{"topic": config.Publisher.Topic})
+		return err
+	}
+	return nil
+}

internal/nats/sub.go

@@ -2,15 +2,16 @@ package nats
 
 import (
 	"caatsm/internal/config"
-	"caatsm/internal/handlers"
 	"context"
+	"errors"
 
 	"github.com/ThreeDotsLabs/watermill"
 	"github.com/ThreeDotsLabs/watermill-nats/v2/pkg/nats"
+	"github.com/ThreeDotsLabs/watermill/message"
 	nc "github.com/nats-io/nats.go"
 )
 
-func Subscribe(config *config.Config, marshaler *handlers.PlainTextMarshaler, handler *handlers.MessageHandler) {
+func Subscribe(config *config.Config, marshaler *PlainTextMarshaler) {
 	logger := watermill.NewStdLogger(false, false)
 	options := []nc.Option{
 		nc.RetryOnFailedConnect(true),
@@ -44,8 +45,9 @@ func Subscribe(config *config.Config, marshaler *handlers.PlainTextMarshaler, ha
 		return
 	}
 
+	handlers := New(config)
 	for msg := range messages {
-		if err := handler.HandleMessage(msg); err == nil {
+		if err := handlers.HandleMessage(msg); err == nil {
 			msg.Ack()
 		} else {
 			logger.Error("Failed to handle message", err, map[string]interface{}{"message": msg})
@@ -53,3 +55,17 @@ func Subscribe(config *config.Config, marshaler *handlers.PlainTextMarshaler, ha
 		}
 	}
 }
+
+type PlainTextMarshaler struct{}
+
+func (m *PlainTextMarshaler) Marshal(topic string, msg nc.Msg) ([]byte, error) {
+	return msg.Data, nil
+}
+
+func (m *PlainTextMarshaler) Unmarshal(newMsg *nc.Msg) (*message.Message, error) {
+	if newMsg == nil {
+		return nil, errors.New("empty message")
+	}
+	msg := message.NewMessage(watermill.NewUUID(), newMsg.Data)
+	return msg, nil
+}