Added "skip-empty" parameter for the protoc plugin, refs #42

README.rst

@@ -55,6 +55,15 @@ plugin provided, which can be used like this:
 This command will generate ``helloworld_pb2.py`` and ``helloworld_grpc.py``
 files.
 
+Plugin parameters:
+
+- ``skip-empty`` - don't generate empty ``*_grpc.py`` file if corresponding
+  ``*.proto`` file doesn't contain service definitions:
+
+  .. code-block:: shell
+
+      --python_grpc_out=skip-empty:output/path
+
 Plugin, which implements ``--python_grpc_out`` option is available for
 ``protoc`` compiler as ``protoc-gen-python_grpc`` executable, which will be
 installed by ``setuptools`` into your ``PATH`` during installation of the

grpclib/plugin/main.py

@@ -147,6 +147,8 @@ def main():
     with os.fdopen(sys.stdin.fileno(), 'rb') as inp:
         request = CodeGeneratorRequest.FromString(inp.read())
 
+    skip_empty = 'skip-empty' in request.parameter.split(',')
+
     types_map = {
         _type_name(pf, mt): '.'.join((_proto2py(pf.name), mt.name))
         for pf in request.proto_file
@@ -175,6 +177,9 @@ def main():
             services.append(Service(service.name,
                                     methods=methods))
 
+        if not services and skip_empty:
+            continue
+
         out = response.file.add()
         out.name = file_to_generate.replace('.proto', SUFFIX)
         out.content = render(proto_file=proto_file.name,