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This commit is contained in:
418
backend/app/services/file_service.py
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418
backend/app/services/file_service.py
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import os
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import hashlib
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import uuid
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import logging
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from typing import Optional, List, Tuple
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from sqlalchemy.orm import Session
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from sqlalchemy import and_, or_, desc
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from fastapi import UploadFile, HTTPException, status
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from datetime import datetime
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from app.models.file import File
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from app.models.user import User
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from app.schemas.file import (
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FileUploadRequest, FileUpdateRequest, FileSearchRequest,
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FileResponse, FileListResponse, StorageInfo, FileInfo
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)
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from app.core.config import settings
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from app.exceptions.file import (
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FileTooLargeException, StorageQuotaExceededException,
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FileAlreadyExistsException, FileNotFoundException,
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InvalidFileTypeException
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)
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class FileService:
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def __init__(self, db: Session):
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self.db = db
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# 使用绝对路径确保文件保存正确
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self.upload_dir = os.path.abspath(settings.UPLOAD_DIR)
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self.max_file_size = settings.MAX_FILE_SIZE
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self.allowed_extensions = settings.ALLOWED_EXTENSIONS
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self.logger = logging.getLogger(__name__)
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# 确保上传目录存在
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os.makedirs(self.upload_dir, exist_ok=True)
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self.logger.info(f"Upload directory (absolute): {self.upload_dir}")
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self.logger.info(f"Upload directory exists: {os.path.exists(self.upload_dir)}")
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self.logger.info(f"Current working directory: {os.getcwd()}")
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def _calculate_file_hash(self, file_content: bytes) -> str:
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"""计算文件的SHA-256哈希值"""
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return hashlib.sha256(file_content).hexdigest()
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def _generate_unique_filename(self, original_filename: str) -> str:
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"""生成唯一的文件名"""
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file_extension = os.path.splitext(original_filename)[1]
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unique_id = str(uuid.uuid4())
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return f"{unique_id}{file_extension}"
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def _validate_file(self, file: UploadFile, user: User) -> None:
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"""验证文件"""
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# 检查文件大小
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if hasattr(file, 'size') and file.size > self.max_file_size:
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raise FileTooLargeException(file.size, self.max_file_size)
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# 检查文件扩展名
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if self.allowed_extensions:
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file_extension = os.path.splitext(file.filename)[1].lower()
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if file_extension not in self.allowed_extensions:
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raise InvalidFileTypeException(file_extension)
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# 检查存储配额
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if hasattr(file, 'size') and not user.is_storage_available(file.size):
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raise StorageQuotaExceededException(user.storage_used, user.storage_quota, file.size)
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def _save_file_to_disk(self, file: UploadFile, unique_filename: str) -> Tuple[str, bytes]:
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"""保存文件到磁盘"""
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file_path = os.path.join(self.upload_dir, unique_filename)
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# 读取文件内容
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file_content = file.file.read()
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# 强制输出调试信息
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import sys
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message = f"[CRITICAL] About to save {len(file_content)} bytes to {file_path}"
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print(message, flush=True)
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sys.stdout.flush()
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message2 = f"[CRITICAL] Content preview: {file_content[:50] if file_content else 'EMPTY'}"
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print(message2, flush=True)
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sys.stdout.flush()
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# 立即验证内容是否为空
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if not file_content:
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print("[CRITICAL] FILE CONTENT IS EMPTY!")
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raise ValueError("File content is empty!")
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# 使用临时文件方法确保写入成功
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temp_path = file_path + '.tmp'
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try:
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# 先写入临时文件
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with open(temp_path, "wb") as temp_file:
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temp_file.write(file_content)
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temp_file.flush()
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os.fsync(temp_file.fileno())
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# 验证临时文件
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if os.path.exists(temp_path):
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temp_size = os.path.getsize(temp_path)
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if temp_size != len(file_content):
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raise Exception(f"Temporary file size mismatch: {temp_size} != {len(file_content)}")
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# 重命名为最终文件名（原子操作）
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if os.name == 'nt': # Windows
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if os.path.exists(file_path):
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os.remove(file_path)
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os.rename(temp_path, file_path)
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# 最终验证
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if not os.path.exists(file_path):
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raise Exception("File was not created after rename")
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final_size = os.path.getsize(file_path)
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if final_size != len(file_content):
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raise Exception(f"Final file size mismatch: {final_size} != {len(file_content)}")
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except Exception as e:
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# 清理临时文件
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if os.path.exists(temp_path):
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os.remove(temp_path)
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print(f"[ERROR] File save failed: {e}")
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raise Exception(f"Failed to save file: {e}")
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# 重置文件指针
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file.file.seek(0)
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return file_path, file_content
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def upload_file(self, file: UploadFile, user: User, upload_request: FileUploadRequest) -> File:
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"""上传文件"""
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try:
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# 验证文件
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self._validate_file(file, user)
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# 生成唯一文件名
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unique_filename = self._generate_unique_filename(file.filename)
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# 保存文件到磁盘
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file_path, file_content = self._save_file_to_disk(file, unique_filename)
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file_size = len(file_content)
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# 再次检查文件大小（如果没有size属性）
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if file_size > self.max_file_size:
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# 删除已保存的文件
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if os.path.exists(file_path):
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os.remove(file_path)
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raise FileTooLargeException(file_size, self.max_file_size)
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# 检查存储配额
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if not user.is_storage_available(file_size):
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# 删除已保存的文件
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if os.path.exists(file_path):
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os.remove(file_path)
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raise StorageQuotaExceededException(user.storage_used, user.storage_quota, file_size)
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# 计算文件哈希
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file_hash = self._calculate_file_hash(file_content)
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# 检查文件是否已存在（基于哈希值）
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existing_file = self.db.query(File).filter(
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and_(
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File.user_id == user.id,
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File.file_hash == file_hash
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)
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).first()
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if existing_file:
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# 删除刚保存的文件，因为已存在相同内容的文件
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if os.path.exists(file_path):
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os.remove(file_path)
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raise FileAlreadyExistsException(existing_file.original_filename)
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# 创建文件记录
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db_file = File(
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user_id=user.id,
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filename=unique_filename,
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original_filename=file.filename,
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file_path=file_path,
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file_size=file_size,
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mime_type=file.content_type or 'application/octet-stream',
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file_hash=file_hash,
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description=upload_request.description,
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tags=upload_request.tags,
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is_public=upload_request.is_public
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)
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self.db.add(db_file)
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# 更新用户存储使用量
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user.storage_used += file_size
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self.db.commit()
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self.db.refresh(db_file)
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return db_file
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except Exception as e:
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self.db.rollback()
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# 如果保存了文件但数据库操作失败，删除文件
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if 'file_path' in locals() and os.path.exists(file_path):
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os.remove(file_path)
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raise e
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def get_user_files(self, user_id: int, page: int = 1, size: int = 20) -> FileListResponse:
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"""获取用户的文件列表"""
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offset = (page - 1) * size
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query = self.db.query(File).filter(File.user_id == user_id)
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total = query.count()
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files = query.order_by(desc(File.created_at)).offset(offset).limit(size).all()
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pages = (total + size - 1) // size
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return FileListResponse(
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files=[FileResponse(
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id=file.id,
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user_id=file.user_id,
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filename=file.filename,
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original_filename=file.original_filename,
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file_size=file.file_size,
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mime_type=file.mime_type,
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file_hash=file.file_hash,
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is_public=file.is_public,
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download_count=file.download_count,
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description=file.description,
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tags=file.tags,
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created_at=file.created_at,
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updated_at=file.updated_at,
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last_accessed_at=file.last_accessed_at
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) for file in files],
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total=total,
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page=page,
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size=size,
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pages=pages
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)
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def get_file_by_id(self, file_id: int, user_id: int) -> Optional[File]:
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"""根据ID获取文件"""
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return self.db.query(File).filter(
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and_(
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File.id == file_id,
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File.user_id == user_id
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)
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).first()
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def update_file(self, file_id: int, user_id: int, update_request: FileUpdateRequest) -> Optional[File]:
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"""更新文件信息"""
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db_file = self.get_file_by_id(file_id, user_id)
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if not db_file:
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raise FileNotFoundException()
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# 更新字段
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if update_request.description is not None:
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db_file.description = update_request.description
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if update_request.tags is not None:
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db_file.tags = update_request.tags
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if update_request.is_public is not None:
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db_file.is_public = update_request.is_public
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db_file.updated_at = datetime.utcnow()
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self.db.commit()
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self.db.refresh(db_file)
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return db_file
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def delete_file(self, file_id: int, user_id: int) -> bool:
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"""删除文件"""
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db_file = self.get_file_by_id(file_id, user_id)
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if not db_file:
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raise FileNotFoundException()
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try:
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# 删除磁盘上的文件
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if os.path.exists(db_file.file_path):
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os.remove(db_file.file_path)
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# 更新用户存储使用量
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user = self.db.query(User).filter(User.id == user_id).first()
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if user:
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user.storage_used = max(0, user.storage_used - db_file.file_size)
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# 删除数据库记录
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self.db.delete(db_file)
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self.db.commit()
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return True
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except Exception as e:
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self.db.rollback()
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raise e
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def search_files(self, user_id: int, search_request: FileSearchRequest,
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page: int = 1, size: int = 20) -> FileListResponse:
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"""搜索文件"""
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offset = (page - 1) * size
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query = self.db.query(File).filter(File.user_id == user_id)
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# 文件名搜索
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if search_request.filename:
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query = query.filter(
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File.original_filename.ilike(f"%{search_request.filename}%")
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)
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# 标签搜索
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if search_request.tags:
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tag_list = [tag.strip() for tag in search_request.tags.split(',')]
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tag_conditions = []
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for tag in tag_list:
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tag_conditions.append(File.tags.ilike(f"%{tag}%"))
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if tag_conditions:
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query = query.filter(or_(*tag_conditions))
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# MIME类型过滤
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if search_request.mime_type:
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query = query.filter(File.mime_type == search_request.mime_type)
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# 公开状态过滤
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if search_request.is_public is not None:
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query = query.filter(File.is_public == search_request.is_public)
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# 日期范围过滤
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if search_request.start_date:
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query = query.filter(File.created_at >= search_request.start_date)
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if search_request.end_date:
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query = query.filter(File.created_at <= search_request.end_date)
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# 文件大小范围过滤
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if search_request.min_size:
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query = query.filter(File.file_size >= search_request.min_size)
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if search_request.max_size:
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query = query.filter(File.file_size <= search_request.max_size)
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total = query.count()
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files = query.order_by(desc(File.created_at)).offset(offset).limit(size).all()
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pages = (total + size - 1) // size
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return FileListResponse(
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files=[FileResponse(
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id=file.id,
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user_id=file.user_id,
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filename=file.filename,
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original_filename=file.original_filename,
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file_size=file.file_size,
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mime_type=file.mime_type,
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file_hash=file.file_hash,
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is_public=file.is_public,
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download_count=file.download_count,
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description=file.description,
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tags=file.tags,
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created_at=file.created_at,
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updated_at=file.updated_at,
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last_accessed_at=file.last_accessed_at
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) for file in files],
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total=total,
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page=page,
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size=size,
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pages=pages
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)
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def get_file_info(self, file_id: int, user_id: int) -> FileInfo:
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"""获取文件详细信息"""
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db_file = self.get_file_by_id(file_id, user_id)
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if not db_file:
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raise FileNotFoundException()
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# 更新最后访问时间
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db_file.last_accessed_at = datetime.utcnow()
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self.db.commit()
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return FileInfo(
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id=db_file.id,
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filename=db_file.filename,
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original_filename=db_file.original_filename,
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file_size=db_file.file_size,
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mime_type=db_file.mime_type,
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file_hash=db_file.file_hash,
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is_image=db_file.is_image(),
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is_document=db_file.is_document(),
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file_extension=db_file.get_file_extension(),
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size_formatted=db_file.get_size_formatted(),
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is_public=db_file.is_public,
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download_count=db_file.download_count,
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description=db_file.description,
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tags=db_file.tags,
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created_at=db_file.created_at,
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updated_at=db_file.updated_at,
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last_accessed_at=db_file.last_accessed_at
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)
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def get_storage_info(self, user_id: int) -> StorageInfo:
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"""获取用户存储信息"""
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user = self.db.query(User).filter(User.id == user_id).first()
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if not user:
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raise HTTPException(
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status_code=status.HTTP_404_NOT_FOUND,
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detail="用户不存在"
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)
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file_count = self.db.query(File).filter(File.user_id == user_id).count()
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available_space = user.storage_quota - user.storage_used
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usage_percentage = user.get_storage_percentage()
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return StorageInfo(
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total_quota=user.storage_quota,
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used_space=user.storage_used,
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available_space=available_space,
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usage_percentage=usage_percentage,
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file_count=file_count
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)
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def increment_download_count(self, file_id: int) -> None:
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"""增加文件下载次数"""
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db_file = self.db.query(File).filter(File.id == file_id).first()
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if db_file:
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db_file.download_count += 1
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db_file.last_accessed_at = datetime.utcnow()
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self.db.commit()
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