[채팅] redis pub/sub을 활용한 채팅

be/build.gradle

@@ -52,6 +52,14 @@ dependencies {
 
     // fcm
     implementation 'com.google.firebase:firebase-admin:9.2.0'
+
+    // websocket
+    implementation 'org.springframework.boot:spring-boot-starter-websocket'
+    implementation 'org.webjars:stomp-websocket:2.3.3-1'
+    implementation 'org.webjars:sockjs-client:1.1.2'
+
+    // redis
+    implementation 'org.springframework.boot:spring-boot-starter-data-redis'
 }
 
 tasks.named('bootBuildImage') {

be/src/main/java/yeonba/be/chatting/controller/ChattingController.java → be/src/main/java/yeonba/be/chatting/controller/ChatController.java

@@ -5,27 +5,63 @@
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.tags.Tag;
 import java.util.List;
+import java.util.Set;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.listener.ChannelTopic;
+import org.springframework.data.redis.listener.RedisMessageListenerContainer;
+import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;
 import org.springframework.http.ResponseEntity;
+import org.springframework.messaging.handler.annotation.MessageMapping;
+import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestAttribute;
-import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.ResponseBody;
+import yeonba.be.chatting.dto.request.ChatPublishRequest;
+import yeonba.be.chatting.dto.response.ChatMessageResponse;
 import yeonba.be.chatting.dto.response.ChatRoomResponse;
 import yeonba.be.chatting.service.ChatService;
 import yeonba.be.util.CustomResponse;
 
 @Tag(name = "Chatting", description = "채팅 API")
-@RestController
+@Slf4j
+@Controller
 @RequiredArgsConstructor
-public class ChattingController {
+public class ChatController {
 
     private final ChatService chatService;
 
-    @Operation(summary = "채팅 목록 조회", description = "자신이 참여 중인 채팅 목록을 조회할 수 있습니다.")
+    @MessageMapping("/chat")
+    public void chat(ChatPublishRequest request) {
+
+        log.info("chatting test log {}", request.getContent());
+
+        chatService.publish(request);
+    }
+
+    @Operation(summary = "채팅 메시지 목록 조회", description = "특정 채팅방의 메시지 목록을 조회할 수 있습니다.")
+    @ApiResponse(responseCode = "200", description = "채팅 메시지 목록 조회 성공")
+    @ResponseBody
+    @GetMapping("/chat-rooms/{roomId}/messages")
+    public ResponseEntity<CustomResponse<List<ChatMessageResponse>>> getChatMessages(
+        @RequestAttribute("userId") long userId,
+        @Parameter(description = "채팅방 ID", example = "1")
+        @PathVariable long roomId) {
+
+        List<ChatMessageResponse> response = chatService.getChatMessages(userId, roomId);
+
+        return ResponseEntity
+            .ok()
+            .body(new CustomResponse<>(response));
+    }
+
+    @Operation(summary = "채팅방 목록 조회", description = "자신이 참여 중인 채팅 목록을 조회할 수 있습니다.")
     @ApiResponse(responseCode = "200", description = "참여 중인 채팅 목록 조회 성공")
-    @GetMapping("/chattings")
+    @ResponseBody
+    @GetMapping("/chat-rooms")
     public ResponseEntity<CustomResponse<List<ChatRoomResponse>>> getChatRooms(
         @RequestAttribute("userId") long userId) {
 
@@ -38,6 +74,7 @@ public ResponseEntity<CustomResponse<List<ChatRoomResponse>>> getChatRooms(
 
     @Operation(summary = "채팅 요청", description = "다른 사용자에게 채팅을 요청할 수 있습니다.")
     @ApiResponse(responseCode = "200", description = "채팅 요청 정상 처리")
+    @ResponseBody
     @PostMapping("/users/{partnerId}/chat")
     public ResponseEntity<CustomResponse<Void>> requestChat(
         @RequestAttribute("userId") long userId,
@@ -53,6 +90,7 @@ public ResponseEntity<CustomResponse<Void>> requestChat(
 
     @Operation(summary = "채팅 요청 수락", description = "요청받은 채팅을 수락할 수 있습니다.")
     @ApiResponse(responseCode = "200", description = "채팅 요청 수락 정상 처리")
+    @ResponseBody
     @PostMapping("/notifications/{notificationId}/chat")
     public ResponseEntity<CustomResponse<Void>> acceptRequestedChat(
         @RequestAttribute("userId") long userId,

be/src/main/java/yeonba/be/chatting/dto/request/ChatPublishRequest.java

@@ -0,0 +1,15 @@
+package yeonba.be.chatting.dto.request;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+import lombok.Getter;
+
+@Getter
+public class ChatPublishRequest implements Serializable {
+
+    private long roomId;
+    private long userId;
+    private String userName;
+    private String content;
+    private LocalDateTime sentAt;
+}

be/src/main/java/yeonba/be/chatting/dto/request/ChatSubscribeResponse.java

@@ -0,0 +1,15 @@
+package yeonba.be.chatting.dto.request;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+import lombok.Getter;
+
+@Getter
+public class ChatSubscribeResponse implements Serializable {
+
+    private long roomId;
+    private long userId;
+    private String userName;
+    private String content;
+    private LocalDateTime sentAt;
+}

be/src/main/java/yeonba/be/chatting/dto/response/ChatMessageResponse.java

@@ -0,0 +1,15 @@
+package yeonba.be.chatting.dto.response;
+
+import java.time.LocalDateTime;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class ChatMessageResponse {
+
+    private long userId;
+    private String userName;
+    private String content;
+    private LocalDateTime sentAt;
+}

be/src/main/java/yeonba/be/chatting/entity/ChatMessage.java

@@ -53,12 +53,13 @@ public class ChatMessage {
 
     private LocalDateTime deletedAt;
 
-    public ChatMessage(ChatRoom chatRoom, User sender, User receiver, String content) {
+    public ChatMessage(ChatRoom chatRoom, User sender, User receiver, String content, LocalDateTime sentAt) {
 
         this.chatRoom = chatRoom;
         this.sender = sender;
         this.receiver = receiver;
         this.content = content;
+        this.sentAt = sentAt;
         this.read = false;
     }
 }

be/src/main/java/yeonba/be/chatting/repository/chatmessage/ChatMessageCommand.java

@@ -10,7 +10,7 @@ public class ChatMessageCommand {
 
     private final ChatMessageRepository chatMessageRepository;
 
-    public ChatMessage createChatMessage(ChatMessage message) {
+    public ChatMessage save(ChatMessage message) {
 
         return chatMessageRepository.save(message);
     }

be/src/main/java/yeonba/be/chatting/repository/chatmessage/ChatMessageQuery.java

@@ -1,8 +1,10 @@
 package yeonba.be.chatting.repository.chatmessage;
 
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Component;
 import yeonba.be.chatting.entity.ChatMessage;
+import yeonba.be.chatting.entity.ChatRoom;
 
 @Component
 @RequiredArgsConstructor
@@ -19,4 +21,9 @@ public int countUnreadMessagesByChatRoomId(long chatRoomId) {
 
         return chatMessageRepository.countByChatRoomIdAndReadIsFalse(chatRoomId);
     }
+
+    public List<ChatMessage> findAllByChatRoom(ChatRoom chatRoom) {
+
+        return chatMessageRepository.findAllByChatRoomOrderBySentAtDesc(chatRoom);
+    }
 }

be/src/main/java/yeonba/be/chatting/repository/chatmessage/ChatMessageRepository.java

@@ -1,13 +1,17 @@
 package yeonba.be.chatting.repository.chatmessage;
 
+import java.util.List;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 import yeonba.be.chatting.entity.ChatMessage;
+import yeonba.be.chatting.entity.ChatRoom;
 
 @Repository
 public interface ChatMessageRepository extends JpaRepository<ChatMessage, Long> {
 
     ChatMessage findFirstByChatRoomIdOrderBySentAtDesc(long chatRoomId);
 
     int countByChatRoomIdAndReadIsFalse(long chatRoomId);
+
+    List<ChatMessage> findAllByChatRoomOrderBySentAtDesc(ChatRoom chatRoom);
 }

be/src/main/java/yeonba/be/chatting/repository/chatroom/ChatRoomQuery.java

@@ -15,6 +15,12 @@ public class ChatRoomQuery {
 
     private final ChatRoomRepository chatRoomRepository;
 
+    public ChatRoom findById(long id) {
+
+        return chatRoomRepository.findById(id)
+            .orElseThrow(() -> new GeneralException(NOT_FOUND_CHAT_ROOM));
+    }
+
     public List<ChatRoom> findAllBy(User user) {
 
         return chatRoomRepository.findAllByUserAndActiveIsTrue(user);

be/src/main/java/yeonba/be/chatting/service/ChatService.java

@@ -4,17 +4,24 @@
 import java.util.List;
 import java.util.Optional;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.data.redis.listener.ChannelTopic;
+import org.springframework.data.redis.listener.RedisMessageListenerContainer;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
+import yeonba.be.chatting.dto.request.ChatPublishRequest;
+import yeonba.be.chatting.dto.response.ChatMessageResponse;
 import yeonba.be.chatting.dto.response.ChatRoomResponse;
 import yeonba.be.chatting.entity.ChatMessage;
 import yeonba.be.chatting.entity.ChatRoom;
 import yeonba.be.chatting.repository.chatmessage.ChatMessageCommand;
 import yeonba.be.chatting.repository.chatmessage.ChatMessageQuery;
 import yeonba.be.chatting.repository.chatroom.ChatRoomCommand;
 import yeonba.be.chatting.repository.chatroom.ChatRoomQuery;
+import yeonba.be.chatting.repository.chatroom.ChatRoomRepository;
 import yeonba.be.exception.BlockException;
+import yeonba.be.exception.ChatException;
 import yeonba.be.exception.GeneralException;
 import yeonba.be.exception.NotificationException;
 import yeonba.be.notification.entity.Notification;
@@ -26,6 +33,7 @@
 import yeonba.be.user.repository.block.BlockQuery;
 import yeonba.be.user.repository.user.UserQuery;
 
+@Slf4j
 @Service
 @RequiredArgsConstructor
 public class ChatService {
@@ -36,9 +44,47 @@ public class ChatService {
     private final ChatMessageQuery chatMessageQuery;
     private final UserQuery userQuery;
     private final BlockQuery blockQuery;
-    private final NotificationQuery notificationQuey;
+    private final NotificationQuery notificationQuery;
 
     private final ApplicationEventPublisher eventPublisher;
+    private final RedisChattingPublisher redisChattingPublisher;
+    private final RedisChattingSubscriber adapter;
+    private final RedisMessageListenerContainer container;
+
+    @Transactional
+    public void publish(ChatPublishRequest request) {
+
+        ChatRoom chatRoom = chatRoomQuery.findById(request.getRoomId());
+        User sender = userQuery.findById(request.getUserId());
+        User receiver = chatRoom.getSender().equals(sender) ? chatRoom.getReceiver()
+            : chatRoom.getSender();
+
+        // TODO: 메시지 Pub/Sub과 메시지 저장 로직 비동기 처리(id, user 등 request, response 변경 가능)
+        redisChattingPublisher.publish(new ChannelTopic(String.valueOf(request.getRoomId())),
+            request);
+        chatMessageCommand.save(
+            new ChatMessage(chatRoom, sender, receiver, request.getContent(), request.getSentAt()));
+    }
+
+    @Transactional(readOnly = true)
+    public List<ChatMessageResponse> getChatMessages(long userId, long roomId) {
+
+        User user = userQuery.findById(userId);
+
+        ChatRoom chatRoom = chatRoomQuery.findById(roomId);
+
+        if (!user.equals(chatRoom.getSender()) && !user.equals(chatRoom.getReceiver())) {
+            throw new GeneralException(ChatException.NOT_YOUR_CHAT_ROOM);
+        }
+
+        List<ChatMessage> chatMessages = chatMessageQuery.findAllByChatRoom(chatRoom);
+
+        return chatMessages.stream()
+            .map(chatMessage -> new ChatMessageResponse(chatMessage.getSender().getId(),
+                chatMessage.getSender().getNickname(),
+                chatMessage.getContent(), chatMessage.getSentAt()))
+            .toList();
+    }
 
     @Transactional(readOnly = true)
     public List<ChatRoomResponse> getChatRooms(long userId) {
@@ -89,9 +135,10 @@ public void requestChat(long senderId, long receiverId) {
         eventPublisher.publishEvent(notificationSendEvent);
     }
 
+    @Transactional
     public void acceptRequestedChat(long userId, long notificationId) {
 
-        Notification notification = notificationQuey.findById(notificationId);
+        Notification notification = notificationQuery.findById(notificationId);
 
         // 채팅 요청 알림인지 검증
         if (!notification.getType().isChattingRequest()) {
@@ -105,15 +152,22 @@ public void acceptRequestedChat(long userId, long notificationId) {
         // 본인에게 온 채팅 요청인지 검증
         if (receiver.equals(userQuery.findById(userId))) {
 
-            throw new GeneralException(NotificationException.NOT_YOUR_CHATTING_REQUEST_NOTIFICATION);
+            throw new GeneralException(
+                NotificationException.NOT_YOUR_CHATTING_REQUEST_NOTIFICATION);
         }
 
         // 채팅방 활성화
         ChatRoom chatRoom = chatRoomQuery.findBy(sender, receiver);
         chatRoom.activeRoom();
 
-        String activeRoom = "채팅방이 활성화되었습니다.";
-        chatMessageCommand.createChatMessage(new ChatMessage(chatRoom, sender, receiver, activeRoom));
+        String activeRoom = "채팅방이 생성되었습니다.";
+
+        chatMessageCommand.save(
+            new ChatMessage(chatRoom, sender, receiver, activeRoom, LocalDateTime.now()));
+
+        // 메시지 수신을 위한 Redis Pub/Sub 구독
+        container.addMessageListener(adapter, new ChannelTopic(String.valueOf(chatRoom.getId())));
+        log.info("channel topic 생성 {}", chatRoom.getId());
 
         NotificationSendEvent notificationSendEvent = new NotificationSendEvent(
             NotificationType.CHATTING_REQUEST_ACCEPTED, receiver, sender,

be/src/main/java/yeonba/be/chatting/service/RedisChattingPublisher.java

@@ -0,0 +1,19 @@
+package yeonba.be.chatting.service;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.listener.ChannelTopic;
+import org.springframework.stereotype.Service;
+import yeonba.be.chatting.dto.request.ChatPublishRequest;
+
+@Service
+@RequiredArgsConstructor
+public class RedisChattingPublisher {
+
+    private final RedisTemplate<String, Object> redisTemplate;
+
+    public void publish(ChannelTopic topic, ChatPublishRequest request) {
+
+        redisTemplate.convertAndSend(topic.getTopic(), request);
+    }
+}