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Code Issues 16 Releases Wiki Activity

Fixed #7712, #9404, #10249, #10300: a light refactor and cleanup of file storage and the `File` object. Thanks to Armin Ronacher and Alex Gaynor. 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10717 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Jacob Kaplan-Moss 2009-05-08 15:08:09 +00:00
parent 2af75b485d
commit 68a890e79f
7 changed files with 107 additions and 139 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
django/core/files/base.py
View File

@ -1,20 +1,23 @@
import os
from django.utils.encoding import smart_str, smart_unicode
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
class File(object):
from django.utils.encoding import smart_str, smart_unicode
from django.core.files.utils import FileProxyMixin
class File(FileProxyMixin):
DEFAULT_CHUNK_SIZE = 64 * 2**10
def __init__(self, file):
def __init__(self, file, name=None):
self.file = file
self._name = file.name
self._mode = file.mode
self._closed = False
if name is None:
name = getattr(file, 'name', None)
self.name = name
self.mode = getattr(file, 'mode', None)
self.closed = False
def __str__(self):
return smart_str(self.name or '')
@ -26,25 +29,11 @@ class File(object):
return "<%s: %s>" % (self.__class__.__name__, self or "None")
def __nonzero__(self):
return not not self.name
return bool(self.name)
def __len__(self):
return self.size
def _get_name(self):
if not hasattr(self, '_name'):
raise ValueError("This operation requires the file to have a name.")
return self._name
name = property(_get_name)
def _get_mode(self):
return self._mode
mode = property(_get_mode)
def _get_closed(self):
return self._closed
closed = property(_get_closed)
def _get_size(self):
if not hasattr(self, '_size'):
if hasattr(self.file, 'size'):
@ -66,7 +55,7 @@ class File(object):
``UploadedFile.DEFAULT_CHUNK_SIZE``).
"""
if not chunk_size:
chunk_size = self.__class__.DEFAULT_CHUNK_SIZE
chunk_size = self.DEFAULT_CHUNK_SIZE
if hasattr(self, 'seek'):
self.seek(0)
@ -89,12 +78,6 @@ class File(object):
chunk_size = self.DEFAULT_CHUNK_SIZE
return self.size > chunk_size
def xreadlines(self):
return iter(self)
def readlines(self):
return list(self.xreadlines())
def __iter__(self):
# Iterate over this file-like object by newlines
buffer_ = None
@ -121,43 +104,22 @@ class File(object):
self.seek(0)
elif os.path.exists(self.file.name):
self.file = open(self.file.name, mode or self.file.mode)
self.closed = False
else:
raise ValueError("The file cannot be reopened.")
def seek(self, position):
self.file.seek(position)
def tell(self):
return self.file.tell()
def read(self, num_bytes=None):
if num_bytes is None:
return self.file.read()
return self.file.read(num_bytes)
def write(self, content):
if not self.mode.startswith('w'):
raise IOError("File was not opened with write access.")
self.file.write(content)
def flush(self):
if not self.mode.startswith('w'):
raise IOError("File was not opened with write access.")
self.file.flush()
def close(self):
self.file.close()
self._closed = True
self.closed = True
class ContentFile(File):
"""
A File-like object that takes just raw content, rather than an actual file.
"""
def __init__(self, content):
self.file = StringIO(content or '')
self.size = len(content or '')
self.file.seek(0)
self._closed = False
content = content or ''
super(ContentFile, self).__init__(StringIO(content))
self.size = len(content)
def __str__(self):
return 'Raw content'
@ -166,6 +128,6 @@ class ContentFile(File):
return True
def open(self, mode=None):
if self._closed:
self._closed = False
if self.closed:
self.closed = False
self.seek(0)

9
django/core/files/temp.py
View File

@ -11,11 +11,12 @@ NamedTemporaryFile uses the O_TEMPORARY flag, and thus cannot be reopened [1].
import os
import tempfile
from django.core.files.utils import FileProxyMixin
__all__ = ('NamedTemporaryFile', 'gettempdir',)
if os.name == 'nt':
class TemporaryFile(object):
class TemporaryFile(FileProxyMixin):
"""
Temporary file object constructor that works in Windows and supports
reopening of the temporary file in windows.
@ -48,12 +49,6 @@ if os.name == 'nt':
def __del__(self):
self.close()
# Proxy to the file object.
def __getattr__(self, name):
return getattr(self.file, name)
def __iter__(self):
return iter(self.file)
NamedTemporaryFile = TemporaryFile
else:
NamedTemporaryFile = tempfile.NamedTemporaryFile

81
django/core/files/uploadedfile.py
View File

@ -26,14 +26,15 @@ class UploadedFile(File):
"""
DEFAULT_CHUNK_SIZE = 64 * 2**10
def __init__(self, name=None, content_type=None, size=None, charset=None):
self.name = name
def __init__(self, file=None, name=None, content_type=None, size=None, charset=None):
super(UploadedFile, self).__init__(file, name)
self.size = size
self.content_type = content_type
self.charset = charset
def __repr__(self):
return "<%s: %s (%s)>" % (self.__class__.__name__, smart_str(self.name), self.content_type)
return "<%s: %s (%s)>" % (
self.__class__.__name__, smart_str(self.name), self.content_type)
def _get_name(self):
return self._name
@ -53,95 +54,66 @@ class UploadedFile(File):
name = property(_get_name, _set_name)
# Abstract methods; subclasses *must* define read() and probably should
# define open/close.
def read(self, num_bytes=None):
raise NotImplementedError()
def open(self):
pass
def close(self):
pass
class TemporaryUploadedFile(UploadedFile):
"""
A file uploaded to a temporary location (i.e. stream-to-disk).
"""
def __init__(self, name, content_type, size, charset):
super(TemporaryUploadedFile, self).__init__(name, content_type, size, charset)
if settings.FILE_UPLOAD_TEMP_DIR:
self._file = tempfile.NamedTemporaryFile(suffix='.upload', dir=settings.FILE_UPLOAD_TEMP_DIR)
file = tempfile.NamedTemporaryFile(suffix='.upload',
dir=settings.FILE_UPLOAD_TEMP_DIR)
else:
self._file = tempfile.NamedTemporaryFile(suffix='.upload')
file = tempfile.NamedTemporaryFile(suffix='.upload')
super(TemporaryUploadedFile, self).__init__(file, name, content_type, size, charset)
def temporary_file_path(self):
"""
Returns the full path of this file.
"""
return self._file.name
return self.file.name
# Most methods on this object get proxied to NamedTemporaryFile.
# We can't directly subclass because NamedTemporaryFile is actually a
# factory function
def read(self, *args): return self._file.read(*args)
def seek(self, *args): return self._file.seek(*args)
def write(self, s): return self._file.write(s)
def tell(self, *args): return self._file.tell(*args)
def __iter__(self): return iter(self._file)
def readlines(self, size=None): return self._file.readlines(size)
def xreadlines(self): return self._file.xreadlines()
def close(self):
try:
return self._file.close()
except OSError, e:
if e.errno == 2:
# Means the file was moved or deleted before the tempfile could unlink it.
# Still sets self._file.close_called and calls self._file.file.close()
# before the exception
return
else:
raise e
try:
return self.file.close()
except OSError, e:
if e.errno != 2:
# Means the file was moved or deleted before the tempfile
# could unlink it. Still sets self.file.close_called and
# calls self.file.file.close() before the exception
raise
finally:
self.closed = True
class InMemoryUploadedFile(UploadedFile):
"""
A file uploaded into memory (i.e. stream-to-memory).
"""
def __init__(self, file, field_name, name, content_type, size, charset):
super(InMemoryUploadedFile, self).__init__(name, content_type, size, charset)
self._file = file
super(InMemoryUploadedFile, self).__init__(file, name, content_type, size, charset)
self.field_name = field_name
self._file.seek(0)
def open(self):
self._file.seek(0)
self.closed = False
self.file.seek(0)
def chunks(self, chunk_size=None):
self._file.seek(0)
self.file.seek(0)
yield self.read()
def multiple_chunks(self, chunk_size=None):
# Since it's in memory, we'll never have multiple chunks.
return False
# proxy methods to StringIO
def read(self, *args): return self._file.read(*args)
def seek(self, *args): return self._file.seek(*args)
def tell(self, *args): return self._file.tell(*args)
def close(self): return self._file.close()
class SimpleUploadedFile(InMemoryUploadedFile):
"""
A simple representation of a file, which just has content, size, and a name.
"""
def __init__(self, name, content, content_type='text/plain'):
self._file = StringIO(content or '')
self.name = name
self.field_name = None
self.size = len(content or '')
self.content_type = content_type
self.charset = None
self._file.seek(0)
content = content or ''
super(SimpleUploadedFile, self).__init__(StringIO(content), None, name,
content_type, len(content), None)
def from_dict(cls, file_dict):
"""
@ -154,5 +126,4 @@ class SimpleUploadedFile(InMemoryUploadedFile):
return cls(file_dict['filename'],
file_dict['content'],
file_dict.get('content-type', 'text/plain'))
from_dict = classmethod(from_dict)

29
django/core/files/utils.py Normal file
View File

@ -0,0 +1,29 @@
class FileProxyMixin(object):
"""
A mixin class used to forward file methods to an underlaying file
object. The internal file object has to be called "file"::
class FileProxy(FileProxyMixin):
def __init__(self, file):
self.file = file
"""
encoding = property(lambda self: self.file.encoding)
fileno = property(lambda self: self.file.fileno)
flush = property(lambda self: self.file.flush)
isatty = property(lambda self: self.file.isatty)
newlines = property(lambda self: self.file.newlines)
read = property(lambda self: self.file.read)
readinto = property(lambda self: self.file.readinto)
readline = property(lambda self: self.file.readline)
readlines = property(lambda self: self.file.readlines)
seek = property(lambda self: self.file.seek)
softspace = property(lambda self: self.file.softspace)
tell = property(lambda self: self.file.tell)
truncate = property(lambda self: self.file.truncate)
write = property(lambda self: self.file.write)
writelines = property(lambda self: self.file.writelines)
xreadlines = property(lambda self: self.file.xreadlines)
def __iter__(self):
return iter(self.file)

40
django/db/models/fields/files.py
View File

@ -17,11 +17,10 @@ from django.db.models.loading import cache
class FieldFile(File):
def __init__(self, instance, field, name):
super(FieldFile, self).__init__(None, name)
self.instance = instance
self.field = field
self.storage = field.storage
self._name = name or u''
self._closed = False
self._committed = True
def __eq__(self, other):
@ -48,10 +47,17 @@ class FieldFile(File):
def _get_file(self):
self._require_file()
if not hasattr(self, '_file'):
if not hasattr(self, '_file') or self._file is None:
self._file = self.storage.open(self.name, 'rb')
return self._file
file = property(_get_file)
def _set_file(self, file):
self._file = file
def _del_file(self):
del self._file
file = property(_get_file, _set_file, _del_file)
def _get_path(self):
self._require_file()
@ -65,6 +71,8 @@ class FieldFile(File):
def _get_size(self):
self._require_file()
if not self._committed:
return len(self.file)
return self.storage.size(self.name)
size = property(_get_size)
@ -80,7 +88,7 @@ class FieldFile(File):
def save(self, name, content, save=True):
name = self.field.generate_filename(self.instance, name)
self._name = self.storage.save(name, content)
self.name = self.storage.save(name, content)
setattr(self.instance, self.field.name, self.name)
# Update the filesize cache
@ -97,11 +105,11 @@ class FieldFile(File):
# presence of self._file
if hasattr(self, '_file'):
self.close()
del self._file
del self.file
self.storage.delete(self.name)
self._name = None
self.name = None
setattr(self.instance, self.field.name, self.name)
# Delete the filesize cache
@ -113,12 +121,18 @@ class FieldFile(File):
self.instance.save()
delete.alters_data = True
def close(self):
file = getattr(self, '_file', None)
if file is not None:
file.close()
self.closed = True
def __getstate__(self):
# FieldFile needs access to its associated model field and an instance
# it's attached to in order to work properly, but the only necessary
# data to be pickled is the file's name itself. Everything else will
# be restored later, by FileDescriptor below.
return {'_name': self.name, '_closed': False, '_committed': True}
return {'name': self.name, 'closed': False, '_committed': True, '_file': None}
class FileDescriptor(object):
def __init__(self, field):
@ -134,12 +148,8 @@ class FileDescriptor(object):
elif isinstance(file, File) and not isinstance(file, FieldFile):
# Other types of files may be assigned as well, but they need to
# have the FieldFile interface added to them
file_copy = copy.copy(file)
file_copy.__class__ = type(file.__class__.__name__,
(file.__class__, self.field.attr_class), {})
file_copy.instance = instance
file_copy.field = self.field
file_copy.storage = self.field.storage
file_copy = self.field.attr_class(instance, self.field, file.name)
file_copy.file = file
file_copy._committed = False
instance.__dict__[self.field.name] = file_copy
elif isinstance(file, FieldFile) and not hasattr(file, 'field'):

2
tests/modeltests/files/models.py
View File

@ -6,6 +6,7 @@ and where files should be stored.
"""
import shutil
import random
import tempfile
from django.db import models
from django.core.files.base import ContentFile
@ -26,7 +27,6 @@ class Storage(models.Model):
def random_upload_to(self, filename):
# This returns a different result each time,
# to make sure it only gets called once.
import random
return '%s/%s' % (random.randint(100, 999), filename)
normal = models.FileField(storage=temp_storage, upload_to='tests')

9
tests/regressiontests/file_storage/models.py
View File

@ -29,7 +29,7 @@ if Image:
mug_width = models.PositiveSmallIntegerField()
__test__ = {'API_TESTS': """
>>> from django.core.files import File
>>> image_data = open(os.path.join(os.path.dirname(__file__), "test.png"), 'rb').read()
>>> p = Person(name="Joe")
>>> p.mugshot.save("mug", ContentFile(image_data))
@ -76,14 +76,15 @@ True
# It won't have an opened file. This is a bit brittle since it depends on the
# the internals of FieldFile, but there's no other way of telling if the
# file's been opened or not.
>>> hasattr(p3.mugshot, '_file')
>>> p3.mugshot._file is not None
False
# After asking for the size, the file should still be closed.
>>> _ = p3.mugshot.size
>>> hasattr(p3.mugshot, '_file')
>>> p3.mugshot._file is not None
False
>>> p = Person.objects.create(name="Bob", mugshot=File(p3.mugshot.file))
>>> shutil.rmtree(temp_storage_dir)
"""}