feat(user-creator-chat): WebSocket Redis room broker를 추가한다

src/main/kotlin/kr/co/vividnext/sodalive/configs/RedisConfig.kt

@@ -14,6 +14,7 @@ import org.springframework.data.redis.connection.RedisStandaloneConfiguration
 import org.springframework.data.redis.connection.lettuce.LettuceClientConfiguration
 import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory
 import org.springframework.data.redis.core.RedisTemplate
+import org.springframework.data.redis.listener.RedisMessageListenerContainer
 import org.springframework.data.redis.repository.configuration.EnableRedisRepositories
 import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer
 import org.springframework.data.redis.serializer.RedisSerializationContext
@@ -63,6 +64,13 @@ class RedisConfig(
         return redisTemplate
     }
 
+    @Bean
+    fun redisMessageListenerContainer(redisConnectionFactory: RedisConnectionFactory): RedisMessageListenerContainer {
+        val container = RedisMessageListenerContainer()
+        container.setConnectionFactory(redisConnectionFactory)
+        return container
+    }
+
     @Bean
     fun cacheManager(redisConnectionFactory: RedisConnectionFactory): RedisCacheManager {
         val defaultCacheConfig = RedisCacheConfiguration.defaultCacheConfig()

src/main/kotlin/kr/co/vividnext/sodalive/v2/usercreatorchat/websocket/UserCreatorChatRoomMessageBroker.kt

@@ -0,0 +1,65 @@
+package kr.co.vividnext.sodalive.v2.usercreatorchat.websocket
+
+import com.fasterxml.jackson.databind.ObjectMapper
+import org.springframework.data.redis.connection.Message
+import org.springframework.data.redis.connection.MessageListener
+import org.springframework.data.redis.core.StringRedisTemplate
+import org.springframework.data.redis.listener.PatternTopic
+import org.springframework.data.redis.listener.RedisMessageListenerContainer
+import org.springframework.stereotype.Component
+import org.springframework.web.socket.TextMessage
+import org.springframework.web.socket.WebSocketSession
+import java.nio.charset.StandardCharsets
+
+@Component
+class UserCreatorChatRoomMessageBroker(
+    private val stringRedisTemplate: StringRedisTemplate,
+    private val sessionRegistry: UserCreatorChatWebSocketSessionRegistry,
+    private val objectMapper: ObjectMapper,
+    listenerContainer: RedisMessageListenerContainer
+) : MessageListener {
+    init {
+        listenerContainer.addMessageListener(this, PatternTopic("$ROOM_CHANNEL_PREFIX:*"))
+    }
+
+    fun publish(roomId: Long, memberId: Long, payload: String) {
+        val message = UserCreatorChatRoomPublishedMessage(
+            roomId = roomId,
+            memberId = memberId,
+            payload = payload
+        )
+        stringRedisTemplate.convertAndSend(roomChannel(roomId), objectMapper.writeValueAsString(message))
+    }
+
+    override fun onMessage(message: Message, pattern: ByteArray?) {
+        val published = objectMapper.readValue(
+            String(message.body, StandardCharsets.UTF_8),
+            UserCreatorChatRoomPublishedMessage::class.java
+        )
+        sessionRegistry.findSessions(published.roomId, published.memberId)
+            .filter { session -> session.isOpen }
+            .forEach { session -> sendMessage(session, published.payload) }
+    }
+
+    private fun sendMessage(session: WebSocketSession, payload: String) {
+        try {
+            session.sendMessage(TextMessage(payload))
+        } catch (_: Exception) {
+            sessionRegistry.remove(session.id)
+        }
+    }
+
+    companion object {
+        private const val ROOM_CHANNEL_PREFIX = "v2:user-creator-chat:ws:room"
+
+        fun roomChannel(roomId: Long): String {
+            return "$ROOM_CHANNEL_PREFIX:$roomId"
+        }
+    }
+}
+
+data class UserCreatorChatRoomPublishedMessage(
+    val roomId: Long,
+    val memberId: Long,
+    val payload: String
+)