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gh-65920: Implementsocket.sendfile withTransmitFile on Windows#112337

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aisk wants to merge11 commits intopython:main
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42 changes: 42 additions & 0 deletionsLib/socket.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -55,6 +55,13 @@
import os, sys, io, selectors
from enum import IntEnum, IntFlag

try:
import _overlapped
import msvcrt
except ImportError:
_overlapped = None
msvcrt = None

try:
import errno
except ImportError:
Expand DownExpand Up@@ -451,6 +458,39 @@ def _sendfile_use_send(self, file, offset=0, count=None):
if total_sent > 0 and hasattr(file, 'seek'):
file.seek(offset + total_sent)

if _overlapped and msvcrt:
def _sendfile_use_transmitfile(self, file, offset=0, count=None):
self._check_sendfile_params(file, offset, count)
timeout = self.gettimeout()
if timeout == 0:
raise ValueError("non-blocking sockets are not supported")
ov = _overlapped.Overlapped()
offset_low = offset & 0xffff_ffff
offset_high = (offset >> 32) & 0xffff_ffff
count = count or 0
try:
fileno = file.fileno()
except (AttributeError, io.UnsupportedOperation) as err:
raise _GiveupOnSendfile(err) # not a regular file
try:
os.fstat(fileno)
except OSError as err:
raise _GiveupOnSendfile(err) # not a regular file
ov.TransmitFile(self.fileno(), msvcrt.get_osfhandle(fileno),
offset_low, offset_high, count, 0, 0)
timeout_ms = _overlapped.INFINITE
if timeout is not None:
timeout_ms = int(timeout * 1000)
try:
sent = ov.getresultex(timeout_ms, False)
except WindowsError as e:
if e.winerror == 258:
raise TimeoutError('timed out')
raise
if sent > 0 and hasattr(file, 'seek'):
file.seek(offset + sent)
return sent

def _check_sendfile_params(self, file, offset, count):
if 'b' not in getattr(file, 'mode', 'b'):
raise ValueError("file should be opened in binary mode")
Expand DownExpand Up@@ -483,6 +523,8 @@ def sendfile(self, file, offset=0, count=None):
Non-blocking sockets are not supported.
"""
try:
if sys.platform == "win32":
return self._sendfile_use_transmitfile(file, offset, count)
return self._sendfile_use_sendfile(file, offset, count)
except _GiveupOnSendfile:
return self._sendfile_use_send(file, offset, count)
Expand Down
9 changes: 9 additions & 0 deletionsLib/test/test_socket.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -6505,6 +6505,15 @@ def meth_from_sock(self, sock):
return getattr(sock, "_sendfile_use_sendfile")


@unittest.skipUnless(sys.platform == "win32", "Windows only test.")
class SendfileUsingTransmitfileTest(SendfileUsingSendTest):
"""
Test the TransmitFile() implementation of socket.sendfile().
"""
def meth_from_sock(self, sock):
return getattr(sock, "_sendfile_use_transmitfile")


@unittest.skipUnless(HAVE_SOCKET_ALG, 'AF_ALG required')
class LinuxKernelCryptoAPI(unittest.TestCase):
# tests for AF_ALG
Expand Down
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
Use :c:func:`!TransmitFile` on Windows to implement :func:`socket.sendfile`.
37 changes: 36 additions & 1 deletionModules/clinic/overlapped.c.h
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Some generated files are not rendered by default. Learn more abouthow customized files appear on GitHub.

116 changes: 81 additions & 35 deletionsModules/overlapped.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -867,44 +867,13 @@ _overlapped_Overlapped_cancel_impl(OverlappedObject *self)
Py_RETURN_NONE;
}

/*[clinic input]
_overlapped.Overlapped.getresult

wait: BOOL(c_default='FALSE') = False
/

Retrieve result of operation.

If wait is true then it blocks until the operation is finished. If wait
is false and the operation is still pending then an error is raised.
[clinic start generated code]*/

static PyObject *
_overlapped_Overlapped_getresult_impl(OverlappedObject *self, BOOL wait)
/*[clinic end generated code: output=8c9bd04d08994f6c input=aa5b03e9897ca074]*/
check_getresult_error(OverlappedObject *self, DWORD transferred)
{
DWORD transferred = 0;
BOOL ret;
DWORD err;
PyObject *addr;

if (self->type == TYPE_NONE) {
PyErr_SetString(PyExc_ValueError, "operation not yet attempted");
return NULL;
}
PyObject *addr = NULL;
DWORD err = self->error;

if (self->type == TYPE_NOT_STARTED) {
PyErr_SetString(PyExc_ValueError, "operation failed to start");
return NULL;
}

Py_BEGIN_ALLOW_THREADS
ret = GetOverlappedResult(self->handle, &self->overlapped, &transferred,
wait);
Py_END_ALLOW_THREADS

self->error = err = ret ? ERROR_SUCCESS : GetLastError();
switch (err) {
switch (self->error) {
case ERROR_SUCCESS:
case ERROR_MORE_DATA:
break;
Expand DownExpand Up@@ -996,6 +965,82 @@ _overlapped_Overlapped_getresult_impl(OverlappedObject *self, BOOL wait)
}
}

/*[clinic input]
_overlapped.Overlapped.getresult

wait: BOOL(c_default='FALSE') = False
/

Retrieve result of operation.

If wait is true then it blocks until the operation is finished. If wait
is false and the operation is still pending then an error is raised.
[clinic start generated code]*/

static PyObject *
_overlapped_Overlapped_getresult_impl(OverlappedObject *self, BOOL wait)
/*[clinic end generated code: output=8c9bd04d08994f6c input=aa5b03e9897ca074]*/
{
DWORD transferred = 0;
BOOL ret;

if (self->type == TYPE_NONE) {
PyErr_SetString(PyExc_ValueError, "operation not yet attempted");
return NULL;
}

if (self->type == TYPE_NOT_STARTED) {
PyErr_SetString(PyExc_ValueError, "operation failed to start");
return NULL;
}

Py_BEGIN_ALLOW_THREADS
ret = GetOverlappedResult(self->handle, &self->overlapped, &transferred,
wait);
Py_END_ALLOW_THREADS

self->error = ret ? ERROR_SUCCESS : GetLastError();

return check_getresult_error(self, transferred);
}

/*[clinic input]
_overlapped.Overlapped.getresultex

milliseconds: DWORD
alertable: BOOL
/

[clinic start generated code]*/

static PyObject *
_overlapped_Overlapped_getresultex_impl(OverlappedObject *self,
DWORD milliseconds, BOOL alertable)
/*[clinic end generated code: output=ce0eb6ffb9618e54 input=ef4f4cab49ac1d80]*/
{
DWORD transferred = 0;
BOOL ret;

if (self->type == TYPE_NONE) {
PyErr_SetString(PyExc_ValueError, "operation not yet attempted");
return NULL;
}

if (self->type == TYPE_NOT_STARTED) {
PyErr_SetString(PyExc_ValueError, "operation failed to start");
return NULL;
}

Py_BEGIN_ALLOW_THREADS
ret = GetOverlappedResultEx(self->handle, &self->overlapped, &transferred,
milliseconds, alertable);
Py_END_ALLOW_THREADS

self->error = ret ? ERROR_SUCCESS : GetLastError();

return check_getresult_error(self, transferred);
}

static PyObject *
do_ReadFile(OverlappedObject *self, HANDLE handle,
char *bufstart, DWORD buflen)
Expand DownExpand Up@@ -1945,6 +1990,7 @@ _overlapped_Overlapped_WSARecvFromInto_impl(OverlappedObject *self,

static PyMethodDef Overlapped_methods[] = {
_OVERLAPPED_OVERLAPPED_GETRESULT_METHODDEF
_OVERLAPPED_OVERLAPPED_GETRESULTEX_METHODDEF
_OVERLAPPED_OVERLAPPED_CANCEL_METHODDEF
_OVERLAPPED_OVERLAPPED_READFILE_METHODDEF
_OVERLAPPED_OVERLAPPED_READFILEINTO_METHODDEF
Expand Down
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