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86 lines
2.9 KiB
Python
86 lines
2.9 KiB
Python
5 years ago
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"""
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Wrappers to make file-like objects cooperative.
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.. class:: FileObject(fobj, mode='r', buffering=-1, closefd=True, encoding=None, errors=None, newline=None)
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The main entry point to the file-like gevent-compatible behaviour. It
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will be defined to be the best available implementation.
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All the parameters are as for :func:`io.open`.
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:param fobj: Usually a file descriptor of a socket. Can also be
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another object with a ``fileno()`` method, or an object that can
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be passed to ``io.open()`` (e.g., a file system path). If the object
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is not a socket, the results will vary based on the platform and the
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type of object being opened.
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All supported versions of Python allow :class:`os.PathLike` objects.
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.. versionchanged:: 1.5
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Accept str and ``PathLike`` objects for *fobj* on all versions of Python.
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.. versionchanged:: 1.5
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Add *encoding*, *errors* and *newline* arguments.
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.. versionchanged:: 1.5
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Accept *closefd* and *buffering* instead of *close* and *bufsize* arguments.
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The latter remain for backwards compatibility.
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There are two main implementations of ``FileObject``. On all systems,
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there is :class:`FileObjectThread` which uses the built-in native
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threadpool to avoid blocking the entire interpreter. On UNIX systems
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(those that support the :mod:`fcntl` module), there is also
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:class:`FileObjectPosix` which uses native non-blocking semantics.
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A third class, :class:`FileObjectBlock`, is simply a wrapper that
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executes everything synchronously (and so is not gevent-compatible).
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It is provided for testing and debugging purposes.
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All classes have the same signature; some may accept extra keyword arguments.
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Configuration
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=============
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You may change the default value for ``FileObject`` using the
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``GEVENT_FILE`` environment variable. Set it to ``posix``, ``thread``,
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or ``block`` to choose from :class:`FileObjectPosix`,
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:class:`FileObjectThread` and :class:`FileObjectBlock`, respectively.
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You may also set it to the fully qualified class name of another
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object that implements the file interface to use one of your own
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objects.
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.. note::
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The environment variable must be set at the time this module
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is first imported.
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Classes
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=======
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"""
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from __future__ import absolute_import
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from gevent._config import config
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__all__ = [
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'FileObjectPosix',
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'FileObjectThread',
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'FileObjectBlock',
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'FileObject',
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]
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try:
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from fcntl import fcntl
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except ImportError:
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__all__.remove("FileObjectPosix")
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else:
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del fcntl
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from gevent._fileobjectposix import FileObjectPosix
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from gevent._fileobjectcommon import FileObjectThread
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from gevent._fileobjectcommon import FileObjectBlock
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# None of the possible objects can live in this module because
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# we would get an import cycle and the config couldn't be set from code.
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# TODO: zope.hookable would be great for allowing this to be imported
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# without requiring configuration but still being very fast.
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FileObject = config.fileobject
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