Add download lora

services/download_manager.py

@@ -0,0 +1,123 @@
+import logging
+import os
+import json
+from typing import Optional, Dict
+from .civitai_client import CivitaiClient
+from .file_monitor import LoraFileMonitor
+from ..utils.models import LoraMetadata
+
+logger = logging.getLogger(__name__)
+
+class DownloadManager:
+    def __init__(self, file_monitor: Optional[LoraFileMonitor] = None):
+        self.civitai_client = CivitaiClient()
+        self.file_monitor = file_monitor
+
+    async def download_from_civitai(self, download_url: str, save_dir: str, relative_path: str = '') -> Dict:
+        try:
+            # Update save directory with relative path if provided
+            if relative_path:
+                save_dir = os.path.join(save_dir, relative_path)
+                # Create directory if it doesn't exist
+                os.makedirs(save_dir, exist_ok=True)
+
+            # Get version info
+            version_id = download_url.split('/')[-1]
+            version_info = await self.civitai_client.get_model_version_info(version_id)
+            if not version_info:
+                return {'success': False, 'error': 'Failed to fetch model metadata'}
+
+            # 2. 获取文件信息
+            file_info = next((f for f in version_info.get('files', []) if f.get('primary')), None)
+            if not file_info:
+                return {'success': False, 'error': 'No primary file found in metadata'}
+
+            # 3. 准备下载
+            file_name = file_info['name']
+            save_path = os.path.join(save_dir, file_name)
+            file_size = file_info.get('sizeKB', 0) * 1024
+
+            # 4. 通知文件监控系统
+            self.file_monitor.handler.add_ignore_path(
+                save_path.replace(os.sep, '/'),
+                file_size
+            )
+
+            # 5. 准备元数据
+            metadata = LoraMetadata.from_civitai_info(version_info, file_info, save_path)
+            
+            # 6. 开始下载流程
+            result = await self._execute_download(
+                download_url=download_url,
+                save_dir=save_dir,
+                metadata=metadata,
+                version_info=version_info,
+                relative_path=relative_path
+            )
+
+            return result
+
+        except Exception as e:
+            logger.error(f"Error in download_from_civitai: {e}", exc_info=True)
+            return {'success': False, 'error': str(e)}
+
+    async def _execute_download(self, download_url: str, save_dir: str, 
+                              metadata: LoraMetadata, version_info: Dict, relative_path: str) -> Dict:
+        """执行实际的下载流程，包括预览图和模型文件"""
+        try:
+            save_path = metadata.file_path
+            metadata_path = os.path.splitext(save_path)[0] + '.metadata.json'
+
+            # 2. 下载预览图（如果有）
+            images = version_info.get('images', [])
+            if images:
+                preview_ext = '.mp4' if images[0].get('type') == 'video' else '.png'
+                preview_path = os.path.splitext(save_path)[0] + '.preview' + preview_ext
+                if await self.civitai_client.download_preview_image(images[0]['url'], preview_path):
+                    metadata.preview_url = preview_path.replace(os.sep, '/')
+                    # 更新元数据中的预览图URL
+                    with open(metadata_path, 'w', encoding='utf-8') as f:
+                        json.dump(metadata.to_dict(), f, indent=2, ensure_ascii=False)
+
+            # 3. 下载模型文件
+            success, result = await self.civitai_client._download_file(
+                download_url, 
+                save_dir,
+                os.path.basename(save_path)
+            )
+
+            if not success:
+                # 下载失败时清理文件
+                for path in [save_path, metadata_path, metadata.preview_url]:
+                    if path and os.path.exists(path):
+                        os.remove(path)
+                return {'success': False, 'error': result}
+
+            # 4. 更新文件信息（大小和修改时间）
+            metadata.update_file_info(save_path)
+
+            # 5. 最终更新元数据
+            with open(metadata_path, 'w', encoding='utf-8') as f:
+                json.dump(metadata.to_dict(), f, indent=2, ensure_ascii=False)
+
+            # 6. update lora cache
+            cache = await self.file_monitor.scanner.get_cached_data()
+            metadata_dict = metadata.to_dict()
+            metadata_dict['folder'] = relative_path
+            cache.raw_data.append(metadata_dict)
+            await cache.resort()
+            all_folders = set(cache.folders)
+            all_folders.add(relative_path)
+            cache.folders = sorted(list(all_folders))
+
+            return {
+                'success': True
+            }
+
+        except Exception as e:
+            logger.error(f"Error in _execute_download: {e}", exc_info=True)
+            # 确保清理任何部分下载的文件
+            for path in [save_path, metadata_path]:
+                if path and os.path.exists(path):
+                    os.remove(path)
+            return {'success': False, 'error': str(e)}