diff options
Diffstat (limited to 'python/google/protobuf/descriptor.py')
| -rwxr-xr-x | python/google/protobuf/descriptor.py | 301 |
1 files changed, 280 insertions, 21 deletions
diff --git a/python/google/protobuf/descriptor.py b/python/google/protobuf/descriptor.py index aa4ab96..6da8bb0 100755 --- a/python/google/protobuf/descriptor.py +++ b/python/google/protobuf/descriptor.py @@ -1,6 +1,6 @@ # Protocol Buffers - Google's data interchange format # Copyright 2008 Google Inc. All rights reserved. -# http://code.google.com/p/protobuf/ +# https://developers.google.com/protocol-buffers/ # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are @@ -28,15 +28,9 @@ # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -# TODO(robinson): We probably need to provide deep-copy methods for -# descriptor types. When a FieldDescriptor is passed into -# Descriptor.__init__(), we should make a deep copy and then set -# containing_type on it. Alternatively, we could just get -# rid of containing_type (iit's not needed for reflection.py, at least). +# Needs to stay compatible with Python 2.5 due to GAE. # -# TODO(robinson): Print method? -# -# TODO(robinson): Useful __repr__? +# Copyright 2007 Google Inc. All Rights Reserved. """Descriptors essentially contain exactly the information found in a .proto file, in types that make this information accessible in Python. @@ -44,11 +38,28 @@ file, in types that make this information accessible in Python. __author__ = 'robinson@google.com (Will Robinson)' +from google.protobuf.internal import api_implementation + + +if api_implementation.Type() == 'cpp': + # Used by MakeDescriptor in cpp mode + import os + import uuid + + if api_implementation.Version() == 2: + from google.protobuf.pyext import _message + else: + from google.protobuf.internal import cpp_message + class Error(Exception): """Base error for this module.""" +class TypeTransformationError(Error): + """Error transforming between python proto type and corresponding C++ type.""" + + class DescriptorBase(object): """Descriptors base class. @@ -75,6 +86,18 @@ class DescriptorBase(object): # Does this descriptor have non-default options? self.has_options = options is not None + def _SetOptions(self, options, options_class_name): + """Sets the descriptor's options + + This function is used in generated proto2 files to update descriptor + options. It must not be used outside proto2. + """ + self._options = options + self._options_class_name = options_class_name + + # Does this descriptor have non-default options? + self.has_options = options is not None + def GetOptions(self): """Retrieves descriptor options. @@ -204,13 +227,21 @@ class Descriptor(_NestedDescriptorBase): options: (descriptor_pb2.MessageOptions) Protocol message options or None to use default message options. + oneofs: (list of OneofDescriptor) The list of descriptors for oneof fields + in this message. + oneofs_by_name: (dict str -> OneofDescriptor) Same objects as in |oneofs|, + but indexed by "name" attribute. + file: (FileDescriptor) Reference to file descriptor. """ + # NOTE(tmarek): The file argument redefining a builtin is nothing we can + # fix right now since we don't know how many clients already rely on the + # name of the argument. def __init__(self, name, full_name, filename, containing_type, fields, nested_types, enum_types, extensions, options=None, - is_extendable=True, extension_ranges=None, file=None, - serialized_start=None, serialized_end=None): + is_extendable=True, extension_ranges=None, oneofs=None, + file=None, serialized_start=None, serialized_end=None): # pylint:disable=redefined-builtin """Arguments to __init__() are as described in the description of Descriptor fields above. @@ -220,7 +251,7 @@ class Descriptor(_NestedDescriptorBase): super(Descriptor, self).__init__( options, 'MessageOptions', name, full_name, file, containing_type, serialized_start=serialized_start, - serialized_end=serialized_start) + serialized_end=serialized_end) # We have fields in addition to fields_by_name and fields_by_number, # so that: @@ -234,6 +265,8 @@ class Descriptor(_NestedDescriptorBase): self.fields_by_name = dict((f.name, f) for f in fields) self.nested_types = nested_types + for nested_type in nested_types: + nested_type.containing_type = self self.nested_types_by_name = dict((t.name, t) for t in nested_types) self.enum_types = enum_types @@ -249,9 +282,28 @@ class Descriptor(_NestedDescriptorBase): self.extensions_by_name = dict((f.name, f) for f in extensions) self.is_extendable = is_extendable self.extension_ranges = extension_ranges + self.oneofs = oneofs if oneofs is not None else [] + self.oneofs_by_name = dict((o.name, o) for o in self.oneofs) + for oneof in self.oneofs: + oneof.containing_type = self - self._serialized_start = serialized_start - self._serialized_end = serialized_end + def EnumValueName(self, enum, value): + """Returns the string name of an enum value. + + This is just a small helper method to simplify a common operation. + + Args: + enum: string name of the Enum. + value: int, value of the enum. + + Returns: + string name of the enum value. + + Raises: + KeyError if either the Enum doesn't exist or the value is not a valid + value for the enum. + """ + return self.enum_types_by_name[enum].values_by_number[value].name def CopyToProto(self, proto): """Copies this to a descriptor_pb2.DescriptorProto. @@ -278,7 +330,7 @@ class FieldDescriptor(DescriptorBase): """Descriptor for a single field in a .proto file. - A FieldDescriptor instance has the following attriubtes: + A FieldDescriptor instance has the following attributes: name: (str) Name of this field, exactly as it appears in .proto. full_name: (str) Name of this field, including containing scope. This is @@ -319,6 +371,9 @@ class FieldDescriptor(DescriptorBase): options: (descriptor_pb2.FieldOptions) Protocol message field options or None to use default field options. + + containing_oneof: (OneofDescriptor) If the field is a member of a oneof + union, contains its descriptor. Otherwise, None. """ # Must be consistent with C++ FieldDescriptor::Type enum in @@ -361,6 +416,27 @@ class FieldDescriptor(DescriptorBase): CPPTYPE_MESSAGE = 10 MAX_CPPTYPE = 10 + _PYTHON_TO_CPP_PROTO_TYPE_MAP = { + TYPE_DOUBLE: CPPTYPE_DOUBLE, + TYPE_FLOAT: CPPTYPE_FLOAT, + TYPE_ENUM: CPPTYPE_ENUM, + TYPE_INT64: CPPTYPE_INT64, + TYPE_SINT64: CPPTYPE_INT64, + TYPE_SFIXED64: CPPTYPE_INT64, + TYPE_UINT64: CPPTYPE_UINT64, + TYPE_FIXED64: CPPTYPE_UINT64, + TYPE_INT32: CPPTYPE_INT32, + TYPE_SFIXED32: CPPTYPE_INT32, + TYPE_SINT32: CPPTYPE_INT32, + TYPE_UINT32: CPPTYPE_UINT32, + TYPE_FIXED32: CPPTYPE_UINT32, + TYPE_BYTES: CPPTYPE_STRING, + TYPE_STRING: CPPTYPE_STRING, + TYPE_BOOL: CPPTYPE_BOOL, + TYPE_MESSAGE: CPPTYPE_MESSAGE, + TYPE_GROUP: CPPTYPE_MESSAGE + } + # Must be consistent with C++ FieldDescriptor::Label enum in # descriptor.h. # @@ -370,10 +446,16 @@ class FieldDescriptor(DescriptorBase): LABEL_REPEATED = 3 MAX_LABEL = 3 + # Must be consistent with C++ constants kMaxNumber, kFirstReservedNumber, + # and kLastReservedNumber in descriptor.h + MAX_FIELD_NUMBER = (1 << 29) - 1 + FIRST_RESERVED_FIELD_NUMBER = 19000 + LAST_RESERVED_FIELD_NUMBER = 19999 + def __init__(self, name, full_name, index, number, type, cpp_type, label, default_value, message_type, enum_type, containing_type, is_extension, extension_scope, options=None, - has_default_value=True): + has_default_value=True, containing_oneof=None): """The arguments are as described in the description of FieldDescriptor attributes above. @@ -396,6 +478,45 @@ class FieldDescriptor(DescriptorBase): self.enum_type = enum_type self.is_extension = is_extension self.extension_scope = extension_scope + self.containing_oneof = containing_oneof + if api_implementation.Type() == 'cpp': + if is_extension: + if api_implementation.Version() == 2: + # pylint: disable=protected-access + self._cdescriptor = ( + _message.Message._GetExtensionDescriptor(full_name)) + # pylint: enable=protected-access + else: + self._cdescriptor = cpp_message.GetExtensionDescriptor(full_name) + else: + if api_implementation.Version() == 2: + # pylint: disable=protected-access + self._cdescriptor = _message.Message._GetFieldDescriptor(full_name) + # pylint: enable=protected-access + else: + self._cdescriptor = cpp_message.GetFieldDescriptor(full_name) + else: + self._cdescriptor = None + + @staticmethod + def ProtoTypeToCppProtoType(proto_type): + """Converts from a Python proto type to a C++ Proto Type. + + The Python ProtocolBuffer classes specify both the 'Python' datatype and the + 'C++' datatype - and they're not the same. This helper method should + translate from one to another. + + Args: + proto_type: the Python proto type (descriptor.FieldDescriptor.TYPE_*) + Returns: + descriptor.FieldDescriptor.CPPTYPE_*, the C++ type. + Raises: + TypeTransformationError: when the Python proto type isn't known. + """ + try: + return FieldDescriptor._PYTHON_TO_CPP_PROTO_TYPE_MAP[proto_type] + except KeyError: + raise TypeTransformationError('Unknown proto_type: %s' % proto_type) class EnumDescriptor(_NestedDescriptorBase): @@ -434,7 +555,7 @@ class EnumDescriptor(_NestedDescriptorBase): super(EnumDescriptor, self).__init__( options, 'EnumOptions', name, full_name, file, containing_type, serialized_start=serialized_start, - serialized_end=serialized_start) + serialized_end=serialized_end) self.values = values for value in self.values: @@ -442,9 +563,6 @@ class EnumDescriptor(_NestedDescriptorBase): self.values_by_name = dict((v.name, v) for v in values) self.values_by_number = dict((v.number, v) for v in values) - self._serialized_start = serialized_start - self._serialized_end = serialized_end - def CopyToProto(self, proto): """Copies this to a descriptor_pb2.EnumDescriptorProto. @@ -479,6 +597,29 @@ class EnumValueDescriptor(DescriptorBase): self.type = type +class OneofDescriptor(object): + """Descriptor for a oneof field. + + name: (str) Name of the oneof field. + full_name: (str) Full name of the oneof field, including package name. + index: (int) 0-based index giving the order of the oneof field inside + its containing type. + containing_type: (Descriptor) Descriptor of the protocol message + type that contains this field. Set by the Descriptor constructor + if we're passed into one. + fields: (list of FieldDescriptor) The list of field descriptors this + oneof can contain. + """ + + def __init__(self, name, full_name, index, containing_type, fields): + """Arguments are as described in the attribute description above.""" + self.name = name + self.full_name = full_name + self.index = index + self.containing_type = containing_type + self.fields = fields + + class ServiceDescriptor(_NestedDescriptorBase): """Descriptor for a service. @@ -557,20 +698,43 @@ class MethodDescriptor(DescriptorBase): class FileDescriptor(DescriptorBase): """Descriptor for a file. Mimics the descriptor_pb2.FileDescriptorProto. + Note that enum_types_by_name, extensions_by_name, and dependencies + fields are only set by the message_factory module, and not by the + generated proto code. + name: name of file, relative to root of source tree. package: name of the package serialized_pb: (str) Byte string of serialized descriptor_pb2.FileDescriptorProto. + dependencies: List of other FileDescriptors this FileDescriptor depends on. + message_types_by_name: Dict of message names of their descriptors. + enum_types_by_name: Dict of enum names and their descriptors. + extensions_by_name: Dict of extension names and their descriptors. """ - def __init__(self, name, package, options=None, serialized_pb=None): + def __init__(self, name, package, options=None, serialized_pb=None, + dependencies=None): """Constructor.""" super(FileDescriptor, self).__init__(options, 'FileOptions') + self.message_types_by_name = {} self.name = name self.package = package self.serialized_pb = serialized_pb + self.enum_types_by_name = {} + self.extensions_by_name = {} + self.dependencies = (dependencies or []) + + if (api_implementation.Type() == 'cpp' and + self.serialized_pb is not None): + if api_implementation.Version() == 2: + # pylint: disable=protected-access + _message.Message._BuildFile(self.serialized_pb) + # pylint: enable=protected-access + else: + cpp_message.BuildFile(self.serialized_pb) + def CopyToProto(self, proto): """Copies this to a descriptor_pb2.FileDescriptorProto. @@ -588,3 +752,98 @@ def _ParseOptions(message, string): """ message.ParseFromString(string) return message + + +def MakeDescriptor(desc_proto, package='', build_file_if_cpp=True): + """Make a protobuf Descriptor given a DescriptorProto protobuf. + + Handles nested descriptors. Note that this is limited to the scope of defining + a message inside of another message. Composite fields can currently only be + resolved if the message is defined in the same scope as the field. + + Args: + desc_proto: The descriptor_pb2.DescriptorProto protobuf message. + package: Optional package name for the new message Descriptor (string). + build_file_if_cpp: Update the C++ descriptor pool if api matches. + Set to False on recursion, so no duplicates are created. + Returns: + A Descriptor for protobuf messages. + """ + if api_implementation.Type() == 'cpp' and build_file_if_cpp: + # The C++ implementation requires all descriptors to be backed by the same + # definition in the C++ descriptor pool. To do this, we build a + # FileDescriptorProto with the same definition as this descriptor and build + # it into the pool. + from google.protobuf import descriptor_pb2 + file_descriptor_proto = descriptor_pb2.FileDescriptorProto() + file_descriptor_proto.message_type.add().MergeFrom(desc_proto) + + # Generate a random name for this proto file to prevent conflicts with + # any imported ones. We need to specify a file name so BuildFile accepts + # our FileDescriptorProto, but it is not important what that file name + # is actually set to. + proto_name = str(uuid.uuid4()) + + if package: + file_descriptor_proto.name = os.path.join(package.replace('.', '/'), + proto_name + '.proto') + file_descriptor_proto.package = package + else: + file_descriptor_proto.name = proto_name + '.proto' + + if api_implementation.Version() == 2: + # pylint: disable=protected-access + _message.Message._BuildFile(file_descriptor_proto.SerializeToString()) + # pylint: enable=protected-access + else: + cpp_message.BuildFile(file_descriptor_proto.SerializeToString()) + + full_message_name = [desc_proto.name] + if package: full_message_name.insert(0, package) + + # Create Descriptors for enum types + enum_types = {} + for enum_proto in desc_proto.enum_type: + full_name = '.'.join(full_message_name + [enum_proto.name]) + enum_desc = EnumDescriptor( + enum_proto.name, full_name, None, [ + EnumValueDescriptor(enum_val.name, ii, enum_val.number) + for ii, enum_val in enumerate(enum_proto.value)]) + enum_types[full_name] = enum_desc + + # Create Descriptors for nested types + nested_types = {} + for nested_proto in desc_proto.nested_type: + full_name = '.'.join(full_message_name + [nested_proto.name]) + # Nested types are just those defined inside of the message, not all types + # used by fields in the message, so no loops are possible here. + nested_desc = MakeDescriptor(nested_proto, + package='.'.join(full_message_name), + build_file_if_cpp=False) + nested_types[full_name] = nested_desc + + fields = [] + for field_proto in desc_proto.field: + full_name = '.'.join(full_message_name + [field_proto.name]) + enum_desc = None + nested_desc = None + if field_proto.HasField('type_name'): + type_name = field_proto.type_name + full_type_name = '.'.join(full_message_name + + [type_name[type_name.rfind('.')+1:]]) + if full_type_name in nested_types: + nested_desc = nested_types[full_type_name] + elif full_type_name in enum_types: + enum_desc = enum_types[full_type_name] + # Else type_name references a non-local type, which isn't implemented + field = FieldDescriptor( + field_proto.name, full_name, field_proto.number - 1, + field_proto.number, field_proto.type, + FieldDescriptor.ProtoTypeToCppProtoType(field_proto.type), + field_proto.label, None, nested_desc, enum_desc, None, False, None, + has_default_value=False) + fields.append(field) + + desc_name = '.'.join(full_message_name) + return Descriptor(desc_proto.name, desc_name, None, None, fields, + nested_types.values(), enum_types.values(), []) |