Windows: Use 32-bit distribution of python

python/gevent/_fileobjectcommon.py

@@ -1,10 +1,20 @@
+from __future__ import absolute_import, print_function, division
 
 try:
     from errno import EBADF
 except ImportError:
     EBADF = 9
 
+import os
 from io import TextIOWrapper
+import functools
+import sys
+
+
+from gevent.hub import _get_hub_noargs as get_hub
+from gevent._compat import integer_types
+from gevent._compat import reraise
+from gevent.lock import Semaphore, DummySemaphore
 
 class cancel_wait_ex(IOError):
 
@@ -53,6 +63,9 @@ class FileObjectBase(object):
     # Whether we are translating universal newlines or not.
     _translate = False
 
+    _translate_encoding = None
+    _translate_errors = None
+
     def __init__(self, io, closefd):
         """
         :param io: An io.IOBase-like object.
@@ -63,8 +76,9 @@ class FileObjectBase(object):
         self._close = closefd
 
         if self._translate:
-            # This automatically handles delegation.
-            self.translate_newlines(None)
+            # This automatically handles delegation by assigning to
+            # self.io
+            self.translate_newlines(None, self._translate_encoding, self._translate_errors)
         else:
             self._do_delegate_methods()
 
@@ -126,3 +140,136 @@ class FileObjectBase(object):
 
     def _extra_repr(self):
         return ''
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        self.close()
+
+class FileObjectBlock(FileObjectBase):
+
+    def __init__(self, fobj, *args, **kwargs):
+        closefd = kwargs.pop('close', True)
+        if kwargs:
+            raise TypeError('Unexpected arguments: %r' % kwargs.keys())
+        if isinstance(fobj, integer_types):
+            if not closefd:
+                # we cannot do this, since fdopen object will close the descriptor
+                raise TypeError('FileObjectBlock does not support close=False on an fd.')
+            fobj = os.fdopen(fobj, *args)
+        super(FileObjectBlock, self).__init__(fobj, closefd)
+
+    def _do_close(self, fobj, closefd):
+        fobj.close()
+
+class FileObjectThread(FileObjectBase):
+    """
+    A file-like object wrapping another file-like object, performing all blocking
+    operations on that object in a background thread.
+
+    .. caution::
+        Attempting to change the threadpool or lock of an existing FileObjectThread
+        has undefined consequences.
+
+    .. versionchanged:: 1.1b1
+       The file object is closed using the threadpool. Note that whether or
+       not this action is synchronous or asynchronous is not documented.
+
+    """
+
+    def __init__(self, fobj, mode=None, bufsize=-1, close=True, threadpool=None, lock=True):
+        """
+        :param fobj: The underlying file-like object to wrap, or an integer fileno
+           that will be pass to :func:`os.fdopen` along with *mode* and *bufsize*.
+        :keyword bool lock: If True (the default) then all operations will
+           be performed one-by-one. Note that this does not guarantee that, if using
+           this file object from multiple threads/greenlets, operations will be performed
+           in any particular order, only that no two operations will be attempted at the
+           same time. You can also pass your own :class:`gevent.lock.Semaphore` to synchronize
+           file operations with an external resource.
+        :keyword bool close: If True (the default) then when this object is closed,
+           the underlying object is closed as well.
+        """
+        closefd = close
+        self.threadpool = threadpool or get_hub().threadpool
+        self.lock = lock
+        if self.lock is True:
+            self.lock = Semaphore()
+        elif not self.lock:
+            self.lock = DummySemaphore()
+        if not hasattr(self.lock, '__enter__'):
+            raise TypeError('Expected a Semaphore or boolean, got %r' % type(self.lock))
+        if isinstance(fobj, integer_types):
+            if not closefd:
+                # we cannot do this, since fdopen object will close the descriptor
+                raise TypeError('FileObjectThread does not support close=False on an fd.')
+            if mode is None:
+                assert bufsize == -1, "If you use the default mode, you can't choose a bufsize"
+                fobj = os.fdopen(fobj)
+            else:
+                fobj = os.fdopen(fobj, mode, bufsize)
+
+        self.__io_holder = [fobj] # signal for _wrap_method
+        super(FileObjectThread, self).__init__(fobj, closefd)
+
+    def _do_close(self, fobj, closefd):
+        self.__io_holder[0] = None # for _wrap_method
+        try:
+            with self.lock:
+                self.threadpool.apply(fobj.flush)
+        finally:
+            if closefd:
+                # Note that we're not taking the lock; older code
+                # did fobj.close() without going through the threadpool at all,
+                # so acquiring the lock could potentially introduce deadlocks
+                # that weren't present before. Avoiding the lock doesn't make
+                # the existing race condition any worse.
+                # We wrap the close in an exception handler and re-raise directly
+                # to avoid the (common, expected) IOError from being logged by the pool
+                def close():
+                    try:
+                        fobj.close()
+                    except: # pylint:disable=bare-except
+                        return sys.exc_info()
+                exc_info = self.threadpool.apply(close)
+                if exc_info:
+                    reraise(*exc_info)
+
+    def _do_delegate_methods(self):
+        super(FileObjectThread, self)._do_delegate_methods()
+        if not hasattr(self, 'read1') and 'r' in getattr(self._io, 'mode', ''):
+            self.read1 = self.read
+        self.__io_holder[0] = self._io
+
+    def _extra_repr(self):
+        return ' threadpool=%r' % (self.threadpool,)
+
+    def __iter__(self):
+        return self
+
+    def next(self):
+        line = self.readline()
+        if line:
+            return line
+        raise StopIteration
+    __next__ = next
+
+    def _wrap_method(self, method):
+        # NOTE: We are careful to avoid introducing a refcycle
+        # within self. Our wrapper cannot refer to self.
+        io_holder = self.__io_holder
+        lock = self.lock
+        threadpool = self.threadpool
+
+        @functools.wraps(method)
+        def thread_method(*args, **kwargs):
+            if io_holder[0] is None:
+                # This is different than FileObjectPosix, etc,
+                # because we want to save the expensive trip through
+                # the threadpool.
+                raise FileObjectClosed()
+            with lock:
+                return threadpool.apply(method, args, kwargs)
+
+        return thread_method