👔 채팅방 리스트 WebClient 호출 로직 추가 (#19)

socket/src/main/java/hexagonal/socket/service/ChatRoomService.java

@@ -0,0 +1,25 @@
+package hexagonal.socket.service;
+
+import hexagonal.socket.dto.RoomInfo;
+import org.springframework.stereotype.Service;
+import org.springframework.web.reactive.function.client.WebClient;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+@Service
+public class ChatRoomService {
+
+    private final WebClient webClient = WebClient.builder()
+            .baseUrl("http://localhost:8080")
+            .build();
+
+    public List<RoomInfo> getRoomInfoList() {
+        return webClient.get()
+                .uri("/v1/room/list")
+                .retrieve()
+                .bodyToFlux(RoomInfo.class)
+                .toStream()
+                .collect(Collectors.toList());
+    }
+}