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feat: 优化文件下载响应中的Content-Length获取逻辑

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为所有存储后端添加文件大小获取逻辑，优先从实际存储系统获取文件大小，失败时回退到数据库记录的大小
This commit is contained in:
jerryliang
2026-01-16 16:53:39 +08:00
parent e6d4b66343
commit f692d83ad4
1 changed files with 70 additions and 6 deletions
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core/storage.py
+70 -6
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@@ -144,10 +144,19 @@ class SystemFileStorage(FileStorageInterface):
filename = f"{file_code.prefix}{file_code.suffix}"
encoded_filename = quote(filename, safe='')
content_disposition = f"attachment; filename*=UTF-8''{encoded_filename}"
# 优先使用文件系统大小
content_length = file_code.size # 默认使用数据库中的大小
try:
content_length = file_path.stat().st_size
except Exception:
# 如果获取文件大小失败，继续使用默认大小
pass
return FileResponse(
file_path,
media_type="application/octet-stream",
headers={"Content-Disposition": content_disposition, "Content-Length": str(file_code.size)},
headers={"Content-Disposition": content_disposition, "Content-Length": str(content_length)},
filename=filename # 保留原始文件名以备某些场景使用
)
@@ -296,12 +305,29 @@ class S3FileStorage(FileStorageInterface):
async def get_file_response(self, file_code: FileCodes):
try:
filename = file_code.prefix + file_code.suffix
content_length = file_code.size # 默认使用数据库中的大小
async with self.session.client(
"s3",
endpoint_url=self.endpoint_url,
region_name=self.region_name,
config=Config(signature_version=self.signature_version),
) as s3:
# 首先尝试获取文件大小（HEAD请求）
try:
head_response = await s3.head_object(
Bucket=self.bucket_name,
Key=await file_code.get_file_path()
)
# 从HEAD响应中获取Content-Length
if 'ContentLength' in head_response:
content_length = head_response['ContentLength']
elif 'Content-Length' in head_response['ResponseMetadata']['HTTPHeaders']:
content_length = int(head_response['ResponseMetadata']['HTTPHeaders']['Content-Length'])
except Exception:
# 如果HEAD请求失败，继续使用默认大小
pass
link = await s3.generate_presigned_url(
"get_object",
Params={
@@ -330,7 +356,7 @@ class S3FileStorage(FileStorageInterface):
from fastapi.responses import StreamingResponse
headers = {
"Content-Disposition": f'attachment; filename="{filename.encode("utf-8").decode("latin-1")}"',
"Content-Length": str(file_code.size)
"Content-Length": str(content_length)
}
return StreamingResponse(
stream_generator(),
@@ -618,6 +644,18 @@ class OneDriveFileStorage(FileStorageInterface):
self._get_file_url, await file_code.get_file_path(), filename
)
content_length = file_code.size # 默认使用数据库中的大小
# 尝试发送HEAD请求获取Content-Length
try:
async with aiohttp.ClientSession() as session:
async with session.head(link) as resp:
if resp.status == 200 and 'Content-Length' in resp.headers:
content_length = int(resp.headers['Content-Length'])
except Exception:
# 如果HEAD请求失败，继续使用默认大小
pass
async def stream_generator():
async with aiohttp.ClientSession() as session:
async with session.get(link) as resp:
@@ -635,7 +673,7 @@ class OneDriveFileStorage(FileStorageInterface):
headers = {
"Content-Disposition": f'attachment; filename="{filename.encode("utf-8").decode("latin-1")}"',
"Content-Length": str(file_code.size)
"Content-Length": str(content_length)
}
return StreamingResponse(
stream_generator(),
@@ -804,6 +842,19 @@ class OpenDALFileStorage(FileStorageInterface):
async def get_file_response(self, file_code: FileCodes):
try:
filename = file_code.prefix + file_code.suffix
content_length = file_code.size # 默认使用数据库中的大小
# 尝试获取文件大小
try:
stat_result = await self.operator.stat(await file_code.get_file_path())
if hasattr(stat_result, 'content_length') and stat_result.content_length:
content_length = stat_result.content_length
elif hasattr(stat_result, 'size') and stat_result.size:
content_length = stat_result.size
except Exception:
# 如果获取大小失败，继续使用默认大小
pass
# 尝试使用流式读取器
try:
# OpenDAL 可能提供 reader 方法返回一个异步读取器
@@ -813,7 +864,7 @@ class OpenDALFileStorage(FileStorageInterface):
content = await self.operator.read(await file_code.get_file_path())
headers = {
"Content-Disposition": f'attachment; filename="{filename}"',
"Content-Length": str(file_code.size)
"Content-Length": str(content_length)
}
return Response(
content, headers=headers, media_type="application/octet-stream"
@@ -829,7 +880,7 @@ class OpenDALFileStorage(FileStorageInterface):
headers = {
"Content-Disposition": f'attachment; filename="{filename}"',
"Content-Length": str(file_code.size)
"Content-Length": str(content_length)
}
return StreamingResponse(
stream_generator(),
@@ -1023,6 +1074,19 @@ class WebDAVFileStorage(FileStorageInterface):
try:
filename = file_code.prefix + file_code.suffix
url = self._build_url(await file_code.get_file_path())
content_length = file_code.size # 默认使用数据库中的大小
# 尝试发送HEAD请求获取Content-Length
try:
async with aiohttp.ClientSession(headers={
"Authorization": f"Basic {base64.b64encode(f'{settings.webdav_username}:{settings.webdav_password}'.encode()).decode()}"
}) as session:
async with session.head(url) as resp:
if resp.status == 200 and 'Content-Length' in resp.headers:
content_length = int(resp.headers['Content-Length'])
except Exception:
# 如果HEAD请求失败，继续使用默认大小
pass
async def stream_generator():
async with aiohttp.ClientSession(headers={
@@ -1043,7 +1107,7 @@ class WebDAVFileStorage(FileStorageInterface):
headers = {
"Content-Disposition": f'attachment; filename="{filename.encode("utf-8").decode()}"',
"Content-Length": str(file_code.size)
"Content-Length": str(content_length)
}
return StreamingResponse(
stream_generator(),