Feat: AI Model Download API 구현

backend/src/main/java/com/worlabel/domain/model/controller/AiModelController.java

@@ -15,6 +15,8 @@ import io.swagger.v3.oas.annotations.tags.Tag;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.core.io.Resource;
+import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.List;
@@ -70,4 +72,15 @@ public class AiModelController {
         log.debug("모델 학습 요청 {}", trainRequest);
         aiModelService.train(memberId, projectId, trainRequest);
     }
+
+    @Operation(summary = "프로젝트 모델 다운로드", description = "프로젝트 모델을 다운로드합니다.")
+    @SwaggerApiSuccess(description = "프로젝트 모델이 성공적으로 다운로드됩니다.")
+    @SwaggerApiError({ErrorCode.EMPTY_REQUEST_PARAMETER, ErrorCode.SERVER_ERROR})
+    @PostMapping("/projects/{project_id}/models/{model_id}/download")
+    public ResponseEntity<Resource> modelDownload(
+            @PathVariable("project_id") final Integer projectId,
+            @PathVariable("model_id") final Integer modelId) {
+        log.debug("다운로드 요청 projectId : {} modelId : {}", projectId, modelId);
+        return aiModelService.modelDownload(projectId, modelId);
+    }
 }

backend/src/main/java/com/worlabel/domain/model/service/AiModelService.java

@@ -26,7 +26,9 @@ import com.worlabel.global.exception.ErrorCode;
 import com.worlabel.global.service.AiRequestService;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.core.io.Resource;
 import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -86,28 +88,18 @@ public class AiModelService {
 
     @CheckPrivilege(PrivilegeType.EDITOR)
     public void train(final Integer memberId, final Integer projectId, final ModelTrainRequest trainRequest) {
-        // FastAPI 서버로 학습 요청을 전송
+        progressService.trainProgressCheck(projectId, trainRequest.getModelId());
+
+        try {
+            progressService.registerTrainProgress(projectId, trainRequest.getModelId());
+
             Project project = getProject(projectId);
             AiModel model = getModel(trainRequest.getModelId());
-
+            TrainRequest aiRequest = getTrainRequest(trainRequest, project, model);
-        Map<String, Integer> labelMap = project.getCategoryList().stream()
-                .collect(Collectors.toMap(
-                        ProjectCategory::getLabelName,
-                        ProjectCategory::getId
-                ));
-
-        List<Image> images = imageRepository.findImagesByProjectIdAndCompleted(projectId);
-
-        List<TrainDataInfo> data = images.stream()
-                .map(TrainDataInfo::of)
-                .toList();
-
-        TrainRequest aiRequest = TrainRequest.of(project.getId(), model.getId(), model.getModelKey(), labelMap, data, trainRequest);
-
-        String endPoint = project.getProjectType().getValue() + "/train";
 
             // FastAPI 서버로 POST 요청 전송
-        log.debug("요청 DTO :{}",aiRequest);
+            log.debug("요청 DTO :{}", aiRequest);
+            String endPoint = project.getProjectType().getValue() + "/train";
             TrainResponse trainResponse = aiRequestService.postRequest(endPoint, aiRequest, TrainResponse.class, this::converterTrain);
 
             // 가져온 modelKey -> version 업된 모델 다시 새롭게 저장
@@ -115,18 +107,66 @@ public class AiModelService {
             int newVersion = model.getVersion() + 1;
             String newName = currentDateTime + String.format("%03d", newVersion);
 
+            // 새로운 모델 저장
             AiModel newModel = AiModel.of(newName, trainResponse.getModelKey(), newVersion, project);
-
             aiModelRepository.save(newModel);
 
+            // 결과 저장
             Result result = Result.of(newModel, trainResponse, trainRequest);
-
             resultRepository.save(result);
 
             // 레디스 정보 DB에 저장
             reportService.changeReport(project.getId(), model.getId(), newModel);
 
+            // 알람 전송
             alarmService.save(memberId, Alarm.AlarmType.TRAIN);
+        } finally {
+            progressService.removeTrainProgress(projectId, trainRequest.getModelId());
+        }
+    }
+
+    @CheckPrivilege(PrivilegeType.EDITOR)
+    public ResponseEntity<Resource> modelDownload(final Integer projectId,final Integer modelId) {
+        AiModel model = getModel(modelId);
+        String modelKey = model.getModelKey();
+
+        String endPoint = "/models/download";
+        endPoint += "?modelKey=" + modelKey;
+
+        ResponseEntity<Resource> fileRequest = aiRequestService.getFileRequest(endPoint);
+    }
+
+    public TrainRequest getTrainRequest(final ModelTrainRequest trainRequest, final Project project, final AiModel model) {
+        Map<String, Integer> labelMap = getLabelMap(project);
+        List<TrainDataInfo> data = getTrainDataInfoList(project.getId());
+        return TrainRequest.of(project.getId(), model.getId(), model.getModelKey(), labelMap, data, trainRequest);
+    }
+
+    // 레이블 맵 만들기
+    private Map<String, Integer> getLabelMap(final Project project) {
+        return project.getCategoryList().stream()
+                .collect(Collectors.toMap(
+                        ProjectCategory::getLabelName,
+                        ProjectCategory::getId
+                ));
+    }
+
+    @Transactional(readOnly = true)
+    public List<TrainDataInfo> getTrainDataInfoList(final Integer projectId) {
+        return imageRepository.findImagesByProjectIdAndCompleted(projectId)
+                .stream()
+                .map(TrainDataInfo::of)
+                .toList();
+    }
+
+    private Project getProject(Integer projectId) {
+        return projectRepository.findById(projectId)
+                .orElseThrow(() -> new CustomException(ErrorCode.DATA_NOT_FOUND));
+    }
+
+    private AiModel getModel(Integer modelId) {
+        return aiModelRepository.findById(modelId)
+                .orElseThrow(() -> new CustomException(ErrorCode.DATA_NOT_FOUND));
     }
 
     private TrainResponse converterTrain(String data) {
@@ -139,27 +179,4 @@ public class AiModelService {
         }
     }
 
-    /**
-     * Json -> List<DefaultResponse>
-     */
-    // TODO: 추후 리팩토링 해야함 이건 예시
-    private List<DefaultResponse> converter(String data) {
-        try {
-            Type listType = new TypeToken<List<DefaultResponse>>() {
-            }.getType();
-            return gson.fromJson(data, listType);
-        } catch (Exception e) {
-            throw new CustomException(ErrorCode.BAD_REQUEST);
-        }
-    }
-
-    private Project getProject(Integer projectId) {
-        return projectRepository.findById(projectId)
-                .orElseThrow(() -> new CustomException(ErrorCode.DATA_NOT_FOUND));
-    }
-
-    private AiModel getModel(Integer modelId) {
-        return aiModelRepository.findById(modelId)
-                .orElseThrow(() -> new CustomException(ErrorCode.DATA_NOT_FOUND));
-    }
 }

backend/src/main/java/com/worlabel/global/service/AiRequestService.java

@@ -5,6 +5,7 @@ import com.worlabel.global.exception.ErrorCode;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.io.Resource;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
@@ -52,6 +53,14 @@ public class AiRequestService {
         return converter.apply(data);
     }
 
+    public ResponseEntity<Resource> getFileRequest(String endPoint) {
+        String url = createApiUrl(endPoint);
+        HttpEntity<Void> request = new HttpEntity<>(createJsonHeaders());
+
+        ResponseEntity<Resource> exchange = restTemplate.exchange(url, HttpMethod.GET, request, Resource.class);
+        return exchange;
+    }
+
     // 응답이 없는 요청인 경우 예 : 오토 레이블링 요청
     private <T> void sendVoidRequest(String url, HttpEntity<T> requestEntity) {
         try {