Build Python distributions standalone for Windows

src/python/grpcio/grpc/_cython/cygrpc.pyx

@@ -50,13 +50,6 @@ include "grpc/_cython/_cygrpc/server.pyx.pxi"
 
 
 def _initialize():
-  if 'win32' in sys.platform:
-    filename = pkg_resources.resource_filename(
-        'grpc._cython', '_windows/grpc_c.64.python')
-    if not isinstance(filename, bytes):
-      filename = filename.encode()
-    if not pygrpc_load_core(filename):
-      raise ImportError('failed to load core gRPC library')
   if not pygrpc_initialize_core():
     raise ImportError('failed to initialize core gRPC library')
 

src/python/grpcio/grpc/_cython/loader.c

@@ -38,10 +38,14 @@
 extern "C" {
 #endif  /* __cpluslus  */
 
-/* TODO(atash) remove cruft */
-
 int pygrpc_load_core(char *path) { return 1; }
 
+// Cython doesn't have Py_AtExit bindings, so we call the C_API directly
+int pygrpc_initialize_core(void) {
+  grpc_init();
+  return Py_AtExit(grpc_shutdown) < 0 ? 0 : 1;
+}
+
 #ifdef __cplusplus
 }
 #endif  /* __cpluslus */

tools/run_tests/build_artifact_python.bat

@@ -28,33 +28,24 @@
 @rem OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
-set NUGET=C:\nuget\nuget.exe
-%NUGET% restore vsprojects\grpc.sln || goto :error
-
-
-@call vsprojects\build_vs2013.bat vsprojects\grpc.sln /t:grpc_dll /p:Configuration=Release /p:PlatformToolset=v120 /p:Platform=Win32 || goto :error
-@call vsprojects\build_vs2013.bat vsprojects\grpc.sln /t:grpc_dll /p:Configuration=Release /p:PlatformToolset=v120 /p:Platform=x64   || goto :error
-
-mkdir src\python\grpcio\grpc\_cython\_windows
-
-@rem TODO(atash): maybe we could avoid the grpc_c.(32|64).python shim below if
-@rem this used the right python build?
-copy /Y vsprojects\Release\grpc_dll.dll src\python\grpcio\grpc\_cython\_windows\grpc_c.32.python || goto :error
-copy /Y vsprojects\x64\Release\grpc_dll.dll src\python\grpcio\grpc\_cython\_windows\grpc_c.64.python || goto :error
-
 set PATH=C:\%1;C:\%1\scripts;C:\msys64\mingw%2\bin;%PATH%
 
 pip install --upgrade six
 pip install --upgrade setuptools
 pip install -rrequirements.txt
 
-set GRPC_PYTHON_USE_CUSTOM_BDIST=0
-set GRPC_PYTHON_BUILD_WITH_CYTHON=1
-
 @rem Because this is windows and *everything seems to hate Windows* we have to
 @rem set all of these flags ourselves because Python won't help us (see the
 @rem setup.py of the grpcio_tools project).
 set GRPC_PYTHON_CFLAGS=-fno-wrapv -frtti -std=c++11
+
+@rem See https://sourceforge.net/p/mingw-w64/bugs/363/
+if %2 == 32 (
+  set GRPC_PYTHON_CFLAGS=%GRPC_PYTHON_CFLAGS% -D_ftime=_ftime32 -D_timeb=__timeb32 -D_ftime_s=_ftime32_s
+) else (
+  set GRPC_PYTHON_CFLAGS=%GRPC_PYTHON_CFLAGS% -D_ftime=_ftime64 -D_timeb=__timeb64
+)
+
 @rem Further confusing things, MSYS2's mingw64 tries to dynamically link
 @rem libgcc, libstdc++, and winpthreads. We have to override this or our
 @rem extensions end up linking to MSYS2 DLLs, which the normal Python on
@@ -66,23 +57,18 @@ python -c "from distutils.cygwinccompiler import get_msvcr; print(get_msvcr()[0]
 set /p PYTHON_MSVCR=<temp.txt
 set GRPC_PYTHON_LDFLAGS=-static-libgcc -static-libstdc++ -mcrtdll=%PYTHON_MSVCR% -static -lpthread
 
-
-@rem Build gRPC
-if %2 == 32 (
-  python setup.py build_ext -c mingw32
-) else (
-  python setup.py build_ext -c mingw32 -DMS_WIN64
-)
-python setup.py bdist_wheel
+set GRPC_PYTHON_BUILD_WITH_CYTHON=1
 
 
-@rem Build gRPC Python tools
+@rem Set up gRPC Python tools
 python tools\distrib\python\make_grpcio_tools.py
-if %2 == 32 (
-  python tools\distrib\python\grpcio_tools\setup.py build_ext -c mingw32
-) else (
-  python tools\distrib\python\grpcio_tools\setup.py build_ext -c mingw32 -DMS_WIN64
-)
+
+@rem Build gRPC Python extensions
+python setup.py build_ext -c mingw32
+python tools\distrib\python\grpcio_tools\setup.py build_ext -c mingw32
+
+@rem Build gRPC Python distributions
+python setup.py bdist_wheel
 python tools\distrib\python\grpcio_tools\setup.py bdist_wheel
 
 mkdir artifacts