我有一个自定义FileSystemStorage类，允许在MEDIA_ROOT通过管理员更改界面上传文件时覆盖子文件夹中现有的上传文件。但是，它在 Django 开发服务器中运行良好，但在 Apache 中，当用户上传文件并且没有报告错误时，不会创建文件（在 Apache error.log 或 Django 日志系统中都没有）。相应的服务器文件夹和子文件夹对 www-data 用户和组都具有适当的 R/W 权限。这是代码：
class MyFileStorage(FileSystemStorage):
def get_available_name(self, name, max_length=None):
#pudb.set_trace()
return name
def _save(self, name, content):
full_path = self.path(name)
# Create any intermediate directories that do not exist.
directory = os.path.dirname(full_path)
logger = logging.getLogger('fileupload')
if not os.path.exists(directory):
try:
if self.directory_permissions_mode is not None:
# os.makedirs applies the global umask, so we reset it,
# for consistency with file_permissions_mode behavior.
old_umask = os.umask(0)
try:
os.makedirs(directory, self.directory_permissions_mode)
finally:
os.umask(old_umask)
else:
logger.debug("MyFileStorage::_save: Trying to create directory: %s" % (directory,))
os.makedirs(directory)
except FileNotFoundError:
# There's a race between os.path.exists() and os.makedirs().
# If os.makedirs() fails with FileNotFoundError, the directory
# was created concurrently.
pass
# If the file already exists we delete it, so we can re-upload a file
# with the same filename and avoid the annoying random characters.
if not os.path.isdir(directory):
logger.debug("MyFileStorage::_save: IOError: %s exists and is not a directory." % directory)
raise IOError("%s exists and is not a directory." % directory)
if os.path.exists(full_path):
logger.debug("MyFileStorage::_save: A file %s already exists. We remove it to avoid Django to crate a copy with random characters added to the filename." % (full_path,))
os.remove(full_path)
# There's a potential race condition between get_available_name and
# saving the file; it's possible that two threads might return the
# same name, at which point all sorts of fun happens. So we need to
# try to create the file, but if it already exists we have to go back
# to get_available_name() and try again.
while True:
try:
# This file has a file path that we can move.
if hasattr(content, 'temporary_file_path'):
logger.debug("MyFileStorage::_save: Moving the file %s to %s" % (content.temporary_file_path(), full_path))
file_move_safe(content.temporary_file_path(), full_path)
# This is a normal uploadedfile that we can stream.
else:
# This fun binary flag incantation makes os.open throw an
# OSError if the file already exists before we open it.
flags = (os.O_WRONLY | os.O_CREAT | os.O_EXCL |
getattr(os, 'O_BINARY', 0))
# The current umask value is masked out by os.open!
fd = os.open(full_path, flags, 0o666)
_file = None
try:
locks.lock(fd, locks.LOCK_EX)
for chunk in content.chunks():
if _file is None:
mode = 'wb' if isinstance(chunk, bytes) else 'wt'
_file = os.fdopen(fd, mode)
logger.debug("MyFileStorage::_save: The file %s was opened in mode '%s'." % (str(fd), mode))
_file.write(chunk)
logger.debug("MyFileStorage::_save: A chunk of information was written to the file %s." % (full_path, ))
finally:
logger.debug("MyFileStorage::_save: Closing file.")
locks.unlock(fd)
if _file is not None:
_file.close()
else:
os.close(fd)
except OSError as e:
if e.errno == errno.EEXIST:
# A new name is needed if the file exists.
logger.debug("MyFileStorage::_save: The file already exists in the server. It needs a new name.")
name = self.get_available_name(name)
full_path = self.path(name)
else:
logger.debug("MyFileStorage::_save: Some error occurred.")
raise e
else:
# OK, the file save worked. Break out of the loop.
break
if self.file_permissions_mode is not None:
logger.debug("MyFileStorage::_save: Changing file permissions.")
os.chmod(full_path, self.file_permissions_mode)
# Store filenames with forward slashes, even on Windows.
if not os.path.exists(full_path):
logger.debug("MyFileStorage::_save: Something went wrong. The file was not created.")
logger.debug("MyFileStorage::_save: Apparently returning normally.")
return name.replace('\\', '/')
相应的 Django 模型使用此自定义存储定义了一个 FileField：
filename = models.FileField(upload_to=get_remote_folder, blank=True, null=True, storage=MyFileStorage())
在哪里：
def get_remote_folder(instance, filename):
if not instance.subjectid is None:
path = settings.MEDIA_ROOT + 'attachments/subjects/%04d/' % (instance.subjectid.id,)
else:
path = settings.MEDIA_ROOT + 'attachments/'
return path + filename
日志文件显示：
MyFileStorage::_save: The file 22 was opened in mode 'wb'.
MyFileStorage::_save: A chunk of information was written to the file /var/www/<app dir goes here>/uploads/attachments/subjects/0015/test_document.pdf.
MyFileStorage::_save: Closing file.
MyFileStorage::_save: Apparently returning normally.
有人知道我缺少什么吗？
更新：如果我手动将文件复制到 Apache 下的文件夹中，并尝试上传相同的文件，则该文件将从文件夹中删除（正如预期的那样，因为如果文件名称相同，我想覆盖文件）但没有新文件被创建。
更新 2：我在 Apache 文件夹上运行了命令watch -n 0.1 ls，我可以看到，当文件上传时，它出现在屏幕上，但显然一旦 _save() 函数离开，它就会被删除。当应用程序在 Django 开发服务器上运行时，不会发生这种情况。