refactor : 백준 API 호출 시 timeout 에러 처리 추가 (#395)

Author: junggyo1020

src/main/java/com/gamzabat/algohub/feature/problem/service/ProblemService.java

@@ -13,6 +13,7 @@
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.client.ResourceAccessException;
 import org.springframework.web.client.RestTemplate;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
@@ -374,6 +375,10 @@ private JsonNode fetchProblemDetails(String problemId) {
 				throw new SolvedAcApiErrorException(HttpStatus.BAD_REQUEST.value(), "백준에 유효하지 않은 문제입니다.");
 
 			return root.get(0);
+		} catch (ResourceAccessException e) {
+			log.error("Timeout or connection failed solved.ac API error : " + e.getMessage());
+			throw new SolvedAcApiErrorException(HttpStatus.GATEWAY_TIMEOUT.value(),
+				"solved.ac API 응답이 지연되거나 연결에 실패했습니다. 잠시 후 다시 시도해주세요.");
 		} catch (JsonProcessingException e) {
 			log.error("Json processing error : " + e.getMessage());
 			throw new SolvedAcApiErrorException(HttpStatus.INTERNAL_SERVER_ERROR.value(),

src/test/java/com/gamzabat/algohub/service/ProblemServiceTest.java

@@ -24,6 +24,7 @@
 import org.springframework.data.domain.Pageable;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.client.ResourceAccessException;
 import org.springframework.web.client.RestTemplate;
 
 import com.gamzabat.algohub.common.DateFormatUtil;
@@ -272,6 +273,29 @@ void createProblemFailed_6() {
 			.hasFieldOrPropertyWithValue("error", "solved.ac API로부터 예상치 못한 응답을 받았습니다.");
 	}
 
+	@Test
+	@DisplayName("문제 생성 실패 : solved.ac API 타임아웃 발생")
+	void createProblemFailed_solvedAcApiTimeout() {
+		// given
+		CreateProblemRequest request = CreateProblemRequest.builder()
+			.link("https://www.acmicpc.net/problem/00")
+			.startDate(LocalDate.now().minusDays(7))
+			.endDate(LocalDate.now())
+			.build();
+
+		when(groupRepository.findById(10L)).thenReturn(Optional.of(group));
+		when(groupMemberRepository.findByUserAndStudyGroup(user, group)).thenReturn(Optional.of(groupMember1));
+
+		when(restTemplate.getForEntity(anyString(), eq(String.class)))
+			.thenThrow(new ResourceAccessException("I/O error: Read timed out"));
+
+		// when, then
+		assertThatThrownBy(() -> problemService.createProblem(user, 10L, request))
+			.isInstanceOf(SolvedAcApiErrorException.class)
+			.hasFieldOrPropertyWithValue("code", HttpStatus.GATEWAY_TIMEOUT.value())
+			.hasFieldOrPropertyWithValue("error", "solved.ac API 응답이 지연되거나 연결에 실패했습니다. 잠시 후 다시 시도해주세요.");
+	}
+
 	@Test
 	@DisplayName("문제 정보 수정 성공")
 	void editProblem() {