refactor: 이메일 전송 그룹 관련 코드 및 테이블 삭제 (#346)

* refactor: 이메일 전송 그룹 관련 코드 및 테이블 삭제
* refactor: 이메일 전송 실패 처리 로직 추가 및 관련 예외 코드 정의
* refactor: 이메일 전송 실패 로그 메시지 개선 및 불필요한 에러 코드 제거

Author: fivedragon5

src/main/java/org/ject/support/external/email/domain/EmailSendGroup.java

@@ -6,14 +6,13 @@
 import org.springframework.http.HttpStatus;
 
 import static org.springframework.http.HttpStatus.BAD_REQUEST;
-import static org.springframework.http.HttpStatus.NOT_FOUND;
+import static org.springframework.http.HttpStatus.SERVICE_UNAVAILABLE;
 
 @Getter
 @AllArgsConstructor
 public enum EmailErrorCode implements ErrorCode {
     INVALID_EMAIL_TEMPLATE(BAD_REQUEST, "INVALID_EMAIL_TEMPLATE", "유효하지 않은 메일 템플릿입니다."),
-    NOT_FOUND_SEND_GROUP(NOT_FOUND, "NOT_FOUND_SEND_GROUP", "존재하지 않는 전송 그룹입니다."),
-    ;
+    EMAIL_SEND_FAILURE(SERVICE_UNAVAILABLE, "EMAIL_SEND_FAILURE", "이메일 전송에 실패했습니다.");
 
     private final HttpStatus httpStatus;
     private final String code;

src/main/java/org/ject/support/external/email/exception/EmailErrorCode.java

@@ -2,12 +2,10 @@
 
 import com.google.common.collect.Lists;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.ject.support.common.util.Map2JsonSerializer;
-import org.ject.support.external.email.domain.EmailSendGroup;
 import org.ject.support.external.email.domain.EmailTemplate;
-import org.ject.support.external.email.exception.EmailErrorCode;
 import org.ject.support.external.email.exception.EmailException;
-import org.ject.support.external.email.repository.EmailSendGroupRepository;
 import org.ject.support.external.infrastructure.SesRateLimiter;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
@@ -26,14 +24,16 @@
 import java.util.List;
 import java.util.Map;
 
+import static org.ject.support.external.email.exception.EmailErrorCode.EMAIL_SEND_FAILURE;
+
+@Slf4j
 @Service
 @RequiredArgsConstructor
 public class SesEmailSendService implements EmailSendService {
 
     private static final String GROUP_CODE_TAG_NAME = "group_code";
 
     private final Map2JsonSerializer map2JsonSerializer;
-    private final EmailSendGroupRepository emailSendGroupRepository;
     private final SesV2Client sesV2Client;
     private final SesRateLimiter rateLimiter;
 
@@ -58,8 +58,12 @@ public void sendTemplatedEmail(EmailTemplate sendGroupCode, String toEmail, Map<
                 .emailTags(messageTag)
                 .build();
 
-        // 이메일 전송
-        sesV2Client.sendEmail(emailRequest);
+        try {
+            sesV2Client.sendEmail(emailRequest);
+        } catch (Exception e) {
+            log.error("이메일 전송 실패 sendGroupCode={}", sendGroupCode.getTemplateName(), e);
+            throw new EmailException(EMAIL_SEND_FAILURE);
+        }
     }
 
     @Override
@@ -94,11 +98,6 @@ public void sendBulkTemplatedEmail(EmailTemplate sendGroupCode, List<String> toL
                 });
     }
 
-    private EmailSendGroup getSendGroup(String sendGroupCode) {
-        return emailSendGroupRepository.findByCode(sendGroupCode)
-                .orElseThrow(() -> new EmailException(EmailErrorCode.NOT_FOUND_SEND_GROUP));
-    }
-
     private Template getTemplate(String templateName, Map<String, String> parameter) {
         return Template.builder()
                 .templateName(templateName)

src/main/java/org/ject/support/external/email/repository/EmailSendGroupRepository.java

@@ -0,0 +1,2 @@
+-- email send group table 삭제
+DROP TABLE IF EXISTS email_send_group;

src/main/java/org/ject/support/external/email/service/SesEmailSendService.java

@@ -0,0 +1,95 @@
+package org.ject.support.external.email.service;
+
+import org.ject.support.base.UnitTestSupport;
+import org.ject.support.common.util.Map2JsonSerializer;
+import org.ject.support.external.email.domain.EmailTemplate;
+import org.ject.support.external.email.exception.EmailErrorCode;
+import org.ject.support.external.email.exception.EmailException;
+import org.ject.support.external.infrastructure.SesRateLimiter;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.springframework.test.util.ReflectionTestUtils;
+import software.amazon.awssdk.services.sesv2.SesV2Client;
+import software.amazon.awssdk.services.sesv2.model.SendEmailRequest;
+import software.amazon.awssdk.services.sesv2.model.SendEmailResponse;
+
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyMap;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.verify;
+
+class SesEmailSendServiceTest extends UnitTestSupport {
+
+    @InjectMocks
+    private SesEmailSendService sesEmailSendService;
+
+    @Mock
+    private Map2JsonSerializer map2JsonSerializer;
+
+    @Mock
+    private SesV2Client sesV2Client;
+
+    @Mock
+    private SesRateLimiter rateLimiter;
+
+    private static final String MOCK_FROM_EMAIL = "test@example.com";
+
+    @BeforeEach
+    void setUp() {
+        ReflectionTestUtils.setField(sesEmailSendService, "from", MOCK_FROM_EMAIL);
+    }
+
+    @Test
+    void 이메일_전송에_실패할_경우_EMAIL_SEND_FAILURE_예외_발생() {
+        // given
+        String to = "user@recipient.com";
+        String subject = "Test Subject";
+        String htmlBody = "<h1>Test Body</h1>";
+
+        SendEmailResponse mockResponse = SendEmailResponse.builder()
+                .messageId("mock-message-id-123")
+                .build();
+        given(map2JsonSerializer.serializeAsString(anyMap())).willReturn("{\"key\":\"value\"}");
+        given(sesV2Client.sendEmail(any(SendEmailRequest.class)))
+                .willThrow(new RuntimeException("Simulated SES send failure"));
+
+        // when, then
+        assertThatThrownBy(() -> sesEmailSendService.sendTemplatedEmail(                EmailTemplate.AUTH_CODE,
+                        to,
+                        Map.of("subject", subject, "htmlBody", htmlBody)
+                ))
+                .isInstanceOf(EmailException.class)
+                .extracting(e -> ((EmailException) e).getErrorCode())
+                .isEqualTo(EmailErrorCode.EMAIL_SEND_FAILURE);
+    }
+
+    @Test
+    void 이메일_전송_성공_시_SES_Client_호출_검증() {
+        // given
+        String to = "user@recipient.com";
+        String subject = "Test Subject";
+        String htmlBody = "<h1>Test Body</h1>";
+
+        SendEmailResponse mockResponse = SendEmailResponse.builder()
+                .messageId("mock-message-id-123")
+                .build();
+        given(map2JsonSerializer.serializeAsString(anyMap())).willReturn("{\"key\":\"value\"}");
+        given(sesV2Client.sendEmail(any(SendEmailRequest.class))).willReturn(mockResponse);
+
+        // when
+        sesEmailSendService.sendTemplatedEmail(
+                EmailTemplate.AUTH_CODE,
+                to,
+                Map.of("subject", subject, "htmlBody", htmlBody)
+        );
+
+        // then
+        verify(map2JsonSerializer).serializeAsString(anyMap());
+        verify(sesV2Client).sendEmail(any(SendEmailRequest.class));
+    }
+}