author | Nishanth Amuluru <nishanth@fossee.in> |
Tue, 11 Jan 2011 16:51:07 +0530 | |
changeset 144 | daca865314e7 |
parent 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
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File storage API |
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================ |
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.. module:: django.core.files.storage |
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Getting the current storage class |
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--------------------------------- |
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Django provides two convenient ways to access the current storage class: |
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.. class:: DefaultStorage |
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:class:`~django.core.files.storage.DefaultStorage` provides |
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lazy access to the current default storage system as defined by |
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:setting:`DEFAULT_FILE_STORAGE`. :class:`DefaultStorage` uses |
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:func:`~django.core.files.storage.get_storage_class` internally. |
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.. function:: get_storage_class([import_path=None]) |
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Returns a class or module which implements the storage API. |
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When called without the ``import_path`` parameter ``get_storage_class`` |
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will return the current default storage system as defined by |
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:setting:`DEFAULT_FILE_STORAGE`. If ``import_path`` is provided, |
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``get_storage_class`` will attempt to import the class or module from the |
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given path and will return it if successful. An exception will be |
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raised if the import is unsuccessful. |
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The FileSystemStorage Class |
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--------------------------- |
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.. class:: FileSystemStorage |
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The :class:`~django.core.files.storage.FileSystemStorage` class implements |
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basic file storage on a local filesystem. It inherits from |
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:class:`~django.core.files.storage.Storage` and provides implementations |
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for all the public methods thereof. |
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.. note:: |
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The :class:`FileSystemStorage.delete` method will not raise |
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raise an exception if the given file name does not exist. |
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The Storage Class |
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----------------- |
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.. class:: Storage |
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The :class:`~django.core.files.storage.Storage` class provides a |
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standardized API for storing files, along with a set of default |
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behaviors that all other storage systems can inherit or override |
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as necessary. |
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.. method:: delete(name) |
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Deletes the file referenced by ``name``. If deletion is not supported |
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on the targest storage system this will raise ``NotImplementedError`` |
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instead |
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.. method:: exists(name) |
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Returns ``True`` if a file referened by the given name already exists |
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in the storage system, or ``False`` if the name is available for a new |
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file. |
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.. method:: get_available_name(name) |
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Returns a filename based on the ``name`` parameter that's free and |
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available for new content to be written to on the target storage |
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system. |
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.. method:: get_valid_name(name) |
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Returns a filename based on the ``name`` parameter that's suitable |
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for use on the target storage system. |
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.. method:: listdir(path) |
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Lists the contents of the specified path, returning a 2-tuple of lists; |
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the first item being directories, the second item being files. For |
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storage systems that aren't able to provide such a listing, this will |
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raise a ``NotImplementedError`` instead. |
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.. method:: open(name, mode='rb') |
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Opens the file given by ``name``. Note that although the returned file |
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is guaranteed to be a ``File`` object, it might actually be some |
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subclass. In the case of remote file storage this means that |
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reading/writing could be quite slow, so be warned. |
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.. method:: path(name) |
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The local filesystem path where the file can be opened using Python's |
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standard ``open()``. For storage systems that aren't accessible from |
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the local filesystem, this will raise ``NotImplementedError`` instead. |
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.. method:: save(name, content) |
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Saves a new file using the storage system, preferably with the name |
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specified. If there already exists a file with this name ``name``, the |
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storage system may modify the filename as necessary to get a unique |
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name. The actual name of the stored file will be returned. |
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The ``content`` argument must be an instance of |
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:class:`django.core.files.File` or of a subclass of |
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:class:`~django.core.files.File`. |
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.. method:: size(name) |
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Returns the total size, in bytes, of the file referenced by ``name``. |
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For storage systems that aren't able to return the file size this will |
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raise ``NotImplementedError`` instead. |
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.. method:: url(name) |
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Returns the URL where the contents of the file referenced by ``name`` |
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can be accessed. For storage systems that don't support access by URL |
c6bca38c1cbf
Added buildout stuff and made changes accordingly
Nishanth Amuluru <nishanth@fossee.in>
parents:
diff
changeset
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119 |
this will raise ``NotImplementedError`` instead. |