Python google.protobuf.descriptor_pb2.FieldDescriptorProto() Examples

def test_service_python_modules_signature():
    service = make_service_with_method_options(
        in_fields=(
            # type=5 is int, so nothing is added.
            descriptor_pb2.FieldDescriptorProto(name='secs', type=5),
            descriptor_pb2.FieldDescriptorProto(
                name='d',
                type=14,  # enum
                type_name='a.b.c.v2.D',
            ),
        ),
        method_signature='secs,d',
    )

    # Ensure that the service will have the expected imports.
    method = service.methods['DoBigThing']
    imports = {i.ident.python_import for i in method.ref_types}
    assert imports == {
        imp.Import(package=('a', 'b', 'c'), module='v2'),
        imp.Import(package=('foo',), module='bar'),
        imp.Import(package=('foo',), module='baz'),
        imp.Import(package=('foo',), module='qux'),
        imp.Import(package=('google', 'api_core'), module='operation'),
        imp.Import(package=('google', 'api_core'), module='operation_async'),
    } 

def convert_protodef_to_editable(proto):
    """
    Protobuf objects can't have arbitrary fields addedd and we need to later on
    add comments to them, so we instead make "Editable" objects that can do so
    """
    class Editable(object):
        def __init__(self, prot):
            self.kind = type(prot)
            self.name = prot.name
            self.comment = ""
            self.options = dict([(key.name, value) for (key, value) in prot.options.ListFields()])
            if isinstance(prot, EnumDescriptorProto):
                self.value = [convert_protodef_to_editable(x) for x in prot.value]
            elif isinstance(prot, DescriptorProto):
                self.field = [convert_protodef_to_editable(x) for x in prot.field]
                self.enum_type = [convert_protodef_to_editable(x) for x in prot.enum_type]
                self.nested_type = prot.nested_type
                self.oneof_decl = prot.oneof_decl
            elif isinstance(prot, EnumValueDescriptorProto):
                self.number = prot.number
            elif isinstance(prot, FieldDescriptorProto):
                if prot.type in [11, 14]:
                    self.ref_type = prot.type_name[1:]
                self.type = prot.type
                self.label = prot.label
            elif isinstance(prot, ServiceDescriptorProto):
                self.method = [convert_protodef_to_editable(x) for x in prot.method]
            elif isinstance(prot, MethodDescriptorProto):
                self.input_type = prot.input_type
                self.output_type = prot.output_type
            else:
                raise Exception, type(prot)

    return Editable(proto) 

def write_extensions(self, extensions):
        # type: (Sequence[d.FieldDescriptorProto]) -> None
        if not extensions:
            return
        l = self._write_line
        field_descriptor_class = self._import(
            "google.protobuf.descriptor", "FieldDescriptor"
        )
        for extension in extensions:
            l("{}: {} = ...", extension.name, field_descriptor_class)
            l("") 

def python_type(self, field):
        # type: (d.FieldDescriptorProto) -> Text
        b_float = self._builtin("float")
        b_int = self._builtin("int")
        b_bool = self._builtin("bool")
        b_bytes = self._builtin("bytes")

        mapping = {
            d.FieldDescriptorProto.TYPE_DOUBLE: lambda: b_float,
            d.FieldDescriptorProto.TYPE_FLOAT: lambda: b_float,
            d.FieldDescriptorProto.TYPE_INT64: lambda: b_int,
            d.FieldDescriptorProto.TYPE_UINT64: lambda: b_int,
            d.FieldDescriptorProto.TYPE_FIXED64: lambda: b_int,
            d.FieldDescriptorProto.TYPE_SFIXED64: lambda: b_int,
            d.FieldDescriptorProto.TYPE_SINT64: lambda: b_int,
            d.FieldDescriptorProto.TYPE_INT32: lambda: b_int,
            d.FieldDescriptorProto.TYPE_UINT32: lambda: b_int,
            d.FieldDescriptorProto.TYPE_FIXED32: lambda: b_int,
            d.FieldDescriptorProto.TYPE_SFIXED32: lambda: b_int,
            d.FieldDescriptorProto.TYPE_SINT32: lambda: b_int,
            d.FieldDescriptorProto.TYPE_BOOL: lambda: b_bool,
            d.FieldDescriptorProto.TYPE_STRING: lambda: self._import("typing", "Text"),
            d.FieldDescriptorProto.TYPE_BYTES: lambda: b_bytes,
            d.FieldDescriptorProto.TYPE_ENUM: lambda: self._import_message(
                field.type_name + "Value"
            ),
            d.FieldDescriptorProto.TYPE_MESSAGE: lambda: self._import_message(
                field.type_name
            ),
            d.FieldDescriptorProto.TYPE_GROUP: lambda: self._import_message(
                field.type_name
            ),
        }  # type: Dict[d.FieldDescriptorProto.Type, Callable[[], Text]]

        assert field.type in mapping, "Unrecognized type: " + repr(field.type)
        return mapping[field.type]() 

def is_scalar(fd):
    # type: (d.FieldDescriptorProto) -> bool
    return not (
        fd.type == d.FieldDescriptorProto.TYPE_MESSAGE
        or fd.type == d.FieldDescriptorProto.TYPE_GROUP
    ) 

def make_field(*, message=None, enum=None, **kwargs) -> wrappers.Field:
    T = descriptor_pb2.FieldDescriptorProto.Type
    kwargs.setdefault('name', 'my_field')
    kwargs.setdefault('number', 1)
    kwargs.setdefault('type', T.Value('TYPE_BOOL'))
    if isinstance(kwargs['type'], str):
        kwargs['type'] = T.Value(kwargs['type'])
    field_pb = descriptor_pb2.FieldDescriptorProto(**kwargs)
    return wrappers.Field(field_pb=field_pb, message=message, enum=enum) 

def make_field_pb2(name: str, number: int,
                   type: int = 11,  # 11 == message
                   type_name: str = None,
                   ) -> desc.FieldDescriptorProto:
    return desc.FieldDescriptorProto(
        name=name,
        number=number,
        type=type,
        type_name=type_name,
    ) 

def make_field(
    name: str = 'my_field',
    number: int = 1,
    repeated: bool = False,
    message: wrappers.MessageType = None,
    enum: wrappers.EnumType = None,
    meta: metadata.Metadata = None,
    **kwargs
) -> wrappers.Field:
    T = desc.FieldDescriptorProto.Type

    if message:
        kwargs.setdefault('type_name', str(message.meta.address))
        kwargs['type'] = 'TYPE_MESSAGE'
    elif enum:
        kwargs.setdefault('type_name',  str(enum.meta.address))
        kwargs['type'] = 'TYPE_ENUM'
    else:
        kwargs.setdefault('type', T.Value('TYPE_BOOL'))

    if isinstance(kwargs['type'], str):
        kwargs['type'] = T.Value(kwargs['type'])

    label = kwargs.pop('label', 3 if repeated else 1)
    field_pb = desc.FieldDescriptorProto(
        name=name,
        label=label,
        number=number,
        **kwargs
    )
    return wrappers.Field(
        field_pb=field_pb,
        enum=enum,
        message=message,
        meta=meta or metadata.Metadata(),
    ) 

def names_from_type_name(type_name):
    '''Parse Names() from FieldDescriptorProto type_name'''
    if type_name[0] != '.':
        raise NotImplementedError("Lookup of non-absolute type names is not supported")
    return Names(type_name[1:].split('.')) 

def iterate_extensions(desc, flatten = False, names = Names()):
    '''Recursively find all extensions.
    For each, yield name, FieldDescriptorProto.
    '''
    for extension in desc.extension:
        yield names, extension

    for subname, subdesc in iterate_messages(desc, flatten, names):
        for extension in subdesc.extension:
            yield subname, extension 

def make_service_with_method_options(
    *,
    http_rule: http_pb2.HttpRule = None,
    method_signature: str = '',
    in_fields: typing.Tuple[desc.FieldDescriptorProto] = ()
) -> wrappers.Service:
    # Declare a method with options enabled for long-running operations and
    # field headers.
    method = get_method(
        'DoBigThing',
        'foo.bar.ThingRequest',
        'google.longrunning.operations_pb2.Operation',
        lro_response_type='foo.baz.ThingResponse',
        lro_metadata_type='foo.qux.ThingMetadata',
        in_fields=in_fields,
        http_rule=http_rule,
        method_signature=method_signature,
    )

    # Define a service descriptor.
    service_pb = desc.ServiceDescriptorProto(name='ThingDoer')

    # Return a service object to test.
    return wrappers.Service(
        service_pb=service_pb,
        methods={method.name: method},
    ) 

def get_method(name: str,
               in_type: str,
               out_type: str,
               lro_response_type: str = '',
               lro_metadata_type: str = '', *,
               in_fields: typing.Tuple[desc.FieldDescriptorProto] = (),
               http_rule: http_pb2.HttpRule = None,
               method_signature: str = '',
               ) -> wrappers.Method:
    input_ = get_message(in_type, fields=in_fields)
    output = get_message(out_type)
    lro = None

    # Define a method descriptor. Set the field headers if appropriate.
    method_pb = desc.MethodDescriptorProto(
        name=name,
        input_type=input_.ident.proto,
        output_type=output.ident.proto,
    )
    if lro_response_type:
        lro = wrappers.OperationInfo(
            response_type=get_message(lro_response_type),
            metadata_type=get_message(lro_metadata_type),
        )
    if http_rule:
        ext_key = annotations_pb2.http
        method_pb.options.Extensions[ext_key].MergeFrom(http_rule)
    if method_signature:
        ext_key = client_pb2.method_signature
        method_pb.options.Extensions[ext_key].append(method_signature)

    return wrappers.Method(
        method_pb=method_pb,
        input=input_,
        output=output,
        lro=lro,
        meta=input_.meta,
    ) 

def get_message(dot_path: str, *,
                fields: typing.Tuple[desc.FieldDescriptorProto] = (),
                ) -> wrappers.MessageType:
    # Pass explicit None through (for lro_metadata).
    if dot_path is None:
        return None

    # Note: The `dot_path` here is distinct from the canonical proto path
    # because it includes the module, which the proto path does not.
    #
    # So, if trying to test the DescriptorProto message here, the path
    # would be google.protobuf.descriptor.DescriptorProto (whereas the proto
    # path is just google.protobuf.DescriptorProto).
    pieces = dot_path.split('.')
    pkg, module, name = pieces[:-2], pieces[-2], pieces[-1]

    return wrappers.MessageType(
        fields={i.name: wrappers.Field(
            field_pb=i,
            enum=get_enum(i.type_name) if i.type_name else None,
        ) for i in fields},
        nested_messages={},
        nested_enums={},
        message_pb=desc.DescriptorProto(name=name, field=fields),
        meta=metadata.Metadata(address=metadata.Address(
            name=name,
            package=tuple(pkg),
            module=module,
        )),
    ) 

def testDescriptorProtoSupport(self):
    # Hand written descriptors/reflection are only supported by the pure-Python
    # implementation of the API.
    if api_implementation.Type() != 'python':
      return

    def AddDescriptorField(proto, field_name, field_type):
      AddDescriptorField.field_index += 1
      new_field = proto.field.add()
      new_field.name = field_name
      new_field.type = field_type
      new_field.number = AddDescriptorField.field_index
      new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL

    AddDescriptorField.field_index = 0

    desc_proto = descriptor_pb2.DescriptorProto()
    desc_proto.name = 'Car'
    fdp = descriptor_pb2.FieldDescriptorProto
    AddDescriptorField(desc_proto, 'name', fdp.TYPE_STRING)
    AddDescriptorField(desc_proto, 'year', fdp.TYPE_INT64)
    AddDescriptorField(desc_proto, 'automatic', fdp.TYPE_BOOL)
    AddDescriptorField(desc_proto, 'price', fdp.TYPE_DOUBLE)
    # Add a repeated field
    AddDescriptorField.field_index += 1
    new_field = desc_proto.field.add()
    new_field.name = 'owners'
    new_field.type = fdp.TYPE_STRING
    new_field.number = AddDescriptorField.field_index
    new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED

    desc = descriptor.MakeDescriptor(desc_proto)
    self.assertTrue('name' in desc.fields_by_name)
    self.assertTrue('year' in desc.fields_by_name)
    self.assertTrue('automatic' in desc.fields_by_name)
    self.assertTrue('price' in desc.fields_by_name)
    self.assertTrue('owners' in desc.fields_by_name)

    class CarMessage(six.with_metaclass(reflection.GeneratedProtocolMessageType, message.Message)):
      DESCRIPTOR = desc

    prius = CarMessage()
    prius.name = 'prius'
    prius.year = 2010
    prius.automatic = True
    prius.price = 25134.75
    prius.owners.extend(['bob', 'susan'])

    serialized_prius = prius.SerializeToString()
    new_prius = reflection.ParseMessage(desc, serialized_prius)
    self.assertTrue(new_prius is not prius)
    self.assertEqual(prius, new_prius)

    # these are unnecessary assuming message equality works as advertised but
    # explicitly check to be safe since we're mucking about in metaclass foo
    self.assertEqual(prius.name, new_prius.name)
    self.assertEqual(prius.year, new_prius.year)
    self.assertEqual(prius.automatic, new_prius.automatic)
    self.assertEqual(prius.price, new_prius.price)
    self.assertEqual(prius.owners, new_prius.owners) 

def testDescriptorProtoSupport(self):
    # Hand written descriptors/reflection are only supported by the pure-Python
    # implementation of the API.
    if api_implementation.Type() != 'python':
      return

    def AddDescriptorField(proto, field_name, field_type):
      AddDescriptorField.field_index += 1
      new_field = proto.field.add()
      new_field.name = field_name
      new_field.type = field_type
      new_field.number = AddDescriptorField.field_index
      new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL

    AddDescriptorField.field_index = 0

    desc_proto = descriptor_pb2.DescriptorProto()
    desc_proto.name = 'Car'
    fdp = descriptor_pb2.FieldDescriptorProto
    AddDescriptorField(desc_proto, 'name', fdp.TYPE_STRING)
    AddDescriptorField(desc_proto, 'year', fdp.TYPE_INT64)
    AddDescriptorField(desc_proto, 'automatic', fdp.TYPE_BOOL)
    AddDescriptorField(desc_proto, 'price', fdp.TYPE_DOUBLE)
    # Add a repeated field
    AddDescriptorField.field_index += 1
    new_field = desc_proto.field.add()
    new_field.name = 'owners'
    new_field.type = fdp.TYPE_STRING
    new_field.number = AddDescriptorField.field_index
    new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED

    desc = descriptor.MakeDescriptor(desc_proto)
    self.assertTrue('name' in desc.fields_by_name)
    self.assertTrue('year' in desc.fields_by_name)
    self.assertTrue('automatic' in desc.fields_by_name)
    self.assertTrue('price' in desc.fields_by_name)
    self.assertTrue('owners' in desc.fields_by_name)

    class CarMessage(six.with_metaclass(reflection.GeneratedProtocolMessageType, message.Message)):
      DESCRIPTOR = desc

    prius = CarMessage()
    prius.name = 'prius'
    prius.year = 2010
    prius.automatic = True
    prius.price = 25134.75
    prius.owners.extend(['bob', 'susan'])

    serialized_prius = prius.SerializeToString()
    new_prius = reflection.ParseMessage(desc, serialized_prius)
    self.assertTrue(new_prius is not prius)
    self.assertEqual(prius, new_prius)

    # these are unnecessary assuming message equality works as advertised but
    # explicitly check to be safe since we're mucking about in metaclass foo
    self.assertEqual(prius.name, new_prius.name)
    self.assertEqual(prius.year, new_prius.year)
    self.assertEqual(prius.automatic, new_prius.automatic)
    self.assertEqual(prius.price, new_prius.price)
    self.assertEqual(prius.owners, new_prius.owners) 

def testDescriptorProtoSupport(self):
    # Hand written descriptors/reflection are only supported by the pure-Python
    # implementation of the API.
    if api_implementation.Type() != 'python':
      return

    def AddDescriptorField(proto, field_name, field_type):
      AddDescriptorField.field_index += 1
      new_field = proto.field.add()
      new_field.name = field_name
      new_field.type = field_type
      new_field.number = AddDescriptorField.field_index
      new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL

    AddDescriptorField.field_index = 0

    desc_proto = descriptor_pb2.DescriptorProto()
    desc_proto.name = 'Car'
    fdp = descriptor_pb2.FieldDescriptorProto
    AddDescriptorField(desc_proto, 'name', fdp.TYPE_STRING)
    AddDescriptorField(desc_proto, 'year', fdp.TYPE_INT64)
    AddDescriptorField(desc_proto, 'automatic', fdp.TYPE_BOOL)
    AddDescriptorField(desc_proto, 'price', fdp.TYPE_DOUBLE)
    # Add a repeated field
    AddDescriptorField.field_index += 1
    new_field = desc_proto.field.add()
    new_field.name = 'owners'
    new_field.type = fdp.TYPE_STRING
    new_field.number = AddDescriptorField.field_index
    new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED

    desc = descriptor.MakeDescriptor(desc_proto)
    self.assertTrue('name' in desc.fields_by_name)
    self.assertTrue('year' in desc.fields_by_name)
    self.assertTrue('automatic' in desc.fields_by_name)
    self.assertTrue('price' in desc.fields_by_name)
    self.assertTrue('owners' in desc.fields_by_name)

    class CarMessage(six.with_metaclass(reflection.GeneratedProtocolMessageType, message.Message)):
      DESCRIPTOR = desc

    prius = CarMessage()
    prius.name = 'prius'
    prius.year = 2010
    prius.automatic = True
    prius.price = 25134.75
    prius.owners.extend(['bob', 'susan'])

    serialized_prius = prius.SerializeToString()
    new_prius = reflection.ParseMessage(desc, serialized_prius)
    self.assertTrue(new_prius is not prius)
    self.assertEqual(prius, new_prius)

    # these are unnecessary assuming message equality works as advertised but
    # explicitly check to be safe since we're mucking about in metaclass foo
    self.assertEqual(prius.name, new_prius.name)
    self.assertEqual(prius.year, new_prius.year)
    self.assertEqual(prius.automatic, new_prius.automatic)
    self.assertEqual(prius.price, new_prius.price)
    self.assertEqual(prius.owners, new_prius.owners) 

def testDescriptorProtoSupport(self):
    # Hand written descriptors/reflection are only supported by the pure-Python
    # implementation of the API.
    if api_implementation.Type() != 'python':
      return

    def AddDescriptorField(proto, field_name, field_type):
      AddDescriptorField.field_index += 1
      new_field = proto.field.add()
      new_field.name = field_name
      new_field.type = field_type
      new_field.number = AddDescriptorField.field_index
      new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL

    AddDescriptorField.field_index = 0

    desc_proto = descriptor_pb2.DescriptorProto()
    desc_proto.name = 'Car'
    fdp = descriptor_pb2.FieldDescriptorProto
    AddDescriptorField(desc_proto, 'name', fdp.TYPE_STRING)
    AddDescriptorField(desc_proto, 'year', fdp.TYPE_INT64)
    AddDescriptorField(desc_proto, 'automatic', fdp.TYPE_BOOL)
    AddDescriptorField(desc_proto, 'price', fdp.TYPE_DOUBLE)
    # Add a repeated field
    AddDescriptorField.field_index += 1
    new_field = desc_proto.field.add()
    new_field.name = 'owners'
    new_field.type = fdp.TYPE_STRING
    new_field.number = AddDescriptorField.field_index
    new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED

    desc = descriptor.MakeDescriptor(desc_proto)
    self.assertTrue('name' in desc.fields_by_name)
    self.assertTrue('year' in desc.fields_by_name)
    self.assertTrue('automatic' in desc.fields_by_name)
    self.assertTrue('price' in desc.fields_by_name)
    self.assertTrue('owners' in desc.fields_by_name)

    class CarMessage(six.with_metaclass(reflection.GeneratedProtocolMessageType, message.Message)):
      DESCRIPTOR = desc

    prius = CarMessage()
    prius.name = 'prius'
    prius.year = 2010
    prius.automatic = True
    prius.price = 25134.75
    prius.owners.extend(['bob', 'susan'])

    serialized_prius = prius.SerializeToString()
    new_prius = reflection.ParseMessage(desc, serialized_prius)
    self.assertTrue(new_prius is not prius)
    self.assertEqual(prius, new_prius)

    # these are unnecessary assuming message equality works as advertised but
    # explicitly check to be safe since we're mucking about in metaclass foo
    self.assertEqual(prius.name, new_prius.name)
    self.assertEqual(prius.year, new_prius.year)
    self.assertEqual(prius.automatic, new_prius.automatic)
    self.assertEqual(prius.price, new_prius.price)
    self.assertEqual(prius.owners, new_prius.owners) 

def testDescriptorProtoSupport(self):
    # Hand written descriptors/reflection are only supported by the pure-Python
    # implementation of the API.
    if api_implementation.Type() != 'python':
      return

    def AddDescriptorField(proto, field_name, field_type):
      AddDescriptorField.field_index += 1
      new_field = proto.field.add()
      new_field.name = field_name
      new_field.type = field_type
      new_field.number = AddDescriptorField.field_index
      new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL

    AddDescriptorField.field_index = 0

    desc_proto = descriptor_pb2.DescriptorProto()
    desc_proto.name = 'Car'
    fdp = descriptor_pb2.FieldDescriptorProto
    AddDescriptorField(desc_proto, 'name', fdp.TYPE_STRING)
    AddDescriptorField(desc_proto, 'year', fdp.TYPE_INT64)
    AddDescriptorField(desc_proto, 'automatic', fdp.TYPE_BOOL)
    AddDescriptorField(desc_proto, 'price', fdp.TYPE_DOUBLE)
    # Add a repeated field
    AddDescriptorField.field_index += 1
    new_field = desc_proto.field.add()
    new_field.name = 'owners'
    new_field.type = fdp.TYPE_STRING
    new_field.number = AddDescriptorField.field_index
    new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED

    desc = descriptor.MakeDescriptor(desc_proto)
    self.assertTrue('name' in desc.fields_by_name)
    self.assertTrue('year' in desc.fields_by_name)
    self.assertTrue('automatic' in desc.fields_by_name)
    self.assertTrue('price' in desc.fields_by_name)
    self.assertTrue('owners' in desc.fields_by_name)

    class CarMessage(six.with_metaclass(reflection.GeneratedProtocolMessageType, message.Message)):
      DESCRIPTOR = desc

    prius = CarMessage()
    prius.name = 'prius'
    prius.year = 2010
    prius.automatic = True
    prius.price = 25134.75
    prius.owners.extend(['bob', 'susan'])

    serialized_prius = prius.SerializeToString()
    new_prius = reflection.ParseMessage(desc, serialized_prius)
    self.assertTrue(new_prius is not prius)
    self.assertEqual(prius, new_prius)

    # these are unnecessary assuming message equality works as advertised but
    # explicitly check to be safe since we're mucking about in metaclass foo
    self.assertEqual(prius.name, new_prius.name)
    self.assertEqual(prius.year, new_prius.year)
    self.assertEqual(prius.automatic, new_prius.automatic)
    self.assertEqual(prius.price, new_prius.price)
    self.assertEqual(prius.owners, new_prius.owners) 

def testDescriptorProtoSupport(self):
    # Hand written descriptors/reflection are only supported by the pure-Python
    # implementation of the API.
    if api_implementation.Type() != 'python':
      return

    def AddDescriptorField(proto, field_name, field_type):
      AddDescriptorField.field_index += 1
      new_field = proto.field.add()
      new_field.name = field_name
      new_field.type = field_type
      new_field.number = AddDescriptorField.field_index
      new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL

    AddDescriptorField.field_index = 0

    desc_proto = descriptor_pb2.DescriptorProto()
    desc_proto.name = 'Car'
    fdp = descriptor_pb2.FieldDescriptorProto
    AddDescriptorField(desc_proto, 'name', fdp.TYPE_STRING)
    AddDescriptorField(desc_proto, 'year', fdp.TYPE_INT64)
    AddDescriptorField(desc_proto, 'automatic', fdp.TYPE_BOOL)
    AddDescriptorField(desc_proto, 'price', fdp.TYPE_DOUBLE)
    # Add a repeated field
    AddDescriptorField.field_index += 1
    new_field = desc_proto.field.add()
    new_field.name = 'owners'
    new_field.type = fdp.TYPE_STRING
    new_field.number = AddDescriptorField.field_index
    new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED

    desc = descriptor.MakeDescriptor(desc_proto)
    self.assertTrue('name' in desc.fields_by_name)
    self.assertTrue('year' in desc.fields_by_name)
    self.assertTrue('automatic' in desc.fields_by_name)
    self.assertTrue('price' in desc.fields_by_name)
    self.assertTrue('owners' in desc.fields_by_name)

    class CarMessage(message.Message, metaclass=reflection.GeneratedProtocolMessageType):
      DESCRIPTOR = desc

    prius = CarMessage()
    prius.name = 'prius'
    prius.year = 2010
    prius.automatic = True
    prius.price = 25134.75
    prius.owners.extend(['bob', 'susan'])

    serialized_prius = prius.SerializeToString()
    new_prius = reflection.ParseMessage(desc, serialized_prius)
    self.assertTrue(new_prius is not prius)
    self.assertEqual(prius, new_prius)

    # these are unnecessary assuming message equality works as advertised but
    # explicitly check to be safe since we're mucking about in metaclass foo
    self.assertEqual(prius.name, new_prius.name)
    self.assertEqual(prius.year, new_prius.year)
    self.assertEqual(prius.automatic, new_prius.automatic)
    self.assertEqual(prius.price, new_prius.price)
    self.assertEqual(prius.owners, new_prius.owners) 

def testDescriptorProtoSupport(self):
    # Hand written descriptors/reflection are only supported by the pure-Python
    # implementation of the API.
    if api_implementation.Type() != 'python':
      return

    def AddDescriptorField(proto, field_name, field_type):
      AddDescriptorField.field_index += 1
      new_field = proto.field.add()
      new_field.name = field_name
      new_field.type = field_type
      new_field.number = AddDescriptorField.field_index
      new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL

    AddDescriptorField.field_index = 0

    desc_proto = descriptor_pb2.DescriptorProto()
    desc_proto.name = 'Car'
    fdp = descriptor_pb2.FieldDescriptorProto
    AddDescriptorField(desc_proto, 'name', fdp.TYPE_STRING)
    AddDescriptorField(desc_proto, 'year', fdp.TYPE_INT64)
    AddDescriptorField(desc_proto, 'automatic', fdp.TYPE_BOOL)
    AddDescriptorField(desc_proto, 'price', fdp.TYPE_DOUBLE)
    # Add a repeated field
    AddDescriptorField.field_index += 1
    new_field = desc_proto.field.add()
    new_field.name = 'owners'
    new_field.type = fdp.TYPE_STRING
    new_field.number = AddDescriptorField.field_index
    new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED

    desc = descriptor.MakeDescriptor(desc_proto)
    self.assertTrue('name' in desc.fields_by_name)
    self.assertTrue('year' in desc.fields_by_name)
    self.assertTrue('automatic' in desc.fields_by_name)
    self.assertTrue('price' in desc.fields_by_name)
    self.assertTrue('owners' in desc.fields_by_name)

    class CarMessage(six.with_metaclass(reflection.GeneratedProtocolMessageType, message.Message)):
      DESCRIPTOR = desc

    prius = CarMessage()
    prius.name = 'prius'
    prius.year = 2010
    prius.automatic = True
    prius.price = 25134.75
    prius.owners.extend(['bob', 'susan'])

    serialized_prius = prius.SerializeToString()
    new_prius = reflection.ParseMessage(desc, serialized_prius)
    self.assertTrue(new_prius is not prius)
    self.assertEqual(prius, new_prius)

    # these are unnecessary assuming message equality works as advertised but
    # explicitly check to be safe since we're mucking about in metaclass foo
    self.assertEqual(prius.name, new_prius.name)
    self.assertEqual(prius.year, new_prius.year)
    self.assertEqual(prius.automatic, new_prius.automatic)
    self.assertEqual(prius.price, new_prius.price)
    self.assertEqual(prius.owners, new_prius.owners) 

def type_to_string(f, map_types):
    """
    Convert type info to pretty names, based on numbers from from FieldDescriptorProto
    https://developers.google.com/protocol-buffers/docs/reference/cpp/google.protobuf.descriptor.pb
    """
    if f.type in [1]:
        return "double"
    elif f.type in [2]:
        return "float"
    elif f.type in [3]:
        return "long"
    elif f.type in [4]:
        return "uint64"
    elif f.type in [5]:
        return "integer"
    elif f.type in [6]:
        return "fixed64"
    elif f.type in [7]:
        return "fixed32"
    elif f.type in [8]:
        return "boolean"
    elif f.type in [9]:
        return "string"
    # missing type 10 - Group
    elif f.type in [11, 14]:
        ref_name = f.ref_type
        if ref_name in map_types:
            ref_fields = map_types[ref_name]
            return {
                "type": "map",
                "key": " %s "% type_to_string(ref_fields["key"], map_types),
                "value": " %s "% type_to_string(ref_fields["value"], map_types)
            }
        else:
            kind = ":protobuf:message:`%s`" % simplify_name(f.ref_type)
            if f.label == 3: # LABEL_REPEATED
                return "list of " + kind
            else:
                return kind
    elif f.type in [12]:
        return "bytes"
    elif f.type in [13]:
        return "uint32"
    elif f.type in [15]:
        return "sfixed32"
    elif f.type in [16]:
        return "sfixed64"
    elif f.type in [17]:
        return "sint32"
    elif f.type in [18]:
        return "sint64"
    else:
        raise Exception, f.type 

def testDescriptorProtoSupport(self):
    # Hand written descriptors/reflection are only supported by the pure-Python
    # implementation of the API.
    if api_implementation.Type() != 'python':
      return

    def AddDescriptorField(proto, field_name, field_type):
      AddDescriptorField.field_index += 1
      new_field = proto.field.add()
      new_field.name = field_name
      new_field.type = field_type
      new_field.number = AddDescriptorField.field_index
      new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_OPTIONAL

    AddDescriptorField.field_index = 0

    desc_proto = descriptor_pb2.DescriptorProto()
    desc_proto.name = 'Car'
    fdp = descriptor_pb2.FieldDescriptorProto
    AddDescriptorField(desc_proto, 'name', fdp.TYPE_STRING)
    AddDescriptorField(desc_proto, 'year', fdp.TYPE_INT64)
    AddDescriptorField(desc_proto, 'automatic', fdp.TYPE_BOOL)
    AddDescriptorField(desc_proto, 'price', fdp.TYPE_DOUBLE)
    # Add a repeated field
    AddDescriptorField.field_index += 1
    new_field = desc_proto.field.add()
    new_field.name = 'owners'
    new_field.type = fdp.TYPE_STRING
    new_field.number = AddDescriptorField.field_index
    new_field.label = descriptor_pb2.FieldDescriptorProto.LABEL_REPEATED

    desc = descriptor.MakeDescriptor(desc_proto)
    self.assertTrue('name' in desc.fields_by_name)
    self.assertTrue('year' in desc.fields_by_name)
    self.assertTrue('automatic' in desc.fields_by_name)
    self.assertTrue('price' in desc.fields_by_name)
    self.assertTrue('owners' in desc.fields_by_name)

    class CarMessage(six.with_metaclass(reflection.GeneratedProtocolMessageType, message.Message)):
      DESCRIPTOR = desc

    prius = CarMessage()
    prius.name = 'prius'
    prius.year = 2010
    prius.automatic = True
    prius.price = 25134.75
    prius.owners.extend(['bob', 'susan'])

    serialized_prius = prius.SerializeToString()
    new_prius = reflection.ParseMessage(desc, serialized_prius)
    self.assertTrue(new_prius is not prius)
    self.assertEqual(prius, new_prius)

    # these are unnecessary assuming message equality works as advertised but
    # explicitly check to be safe since we're mucking about in metaclass foo
    self.assertEqual(prius.name, new_prius.name)
    self.assertEqual(prius.year, new_prius.year)
    self.assertEqual(prius.automatic, new_prius.automatic)
    self.assertEqual(prius.price, new_prius.price)
    self.assertEqual(prius.owners, new_prius.owners)