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62 lines
1.8 KiB
62 lines
1.8 KiB
5 years ago
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"""
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Wrappers to make file-like objects cooperative.
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.. class:: FileObject
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The main entry point to the file-like gevent-compatible behaviour. It will be defined
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to be the best available implementation.
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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 executes everything
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synchronously (and so is not gevent-compatible). It is provided for testing and debugging
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purposes.
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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:: 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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FileObject = config.fileobject
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