Edit File: descriptor.py
# Protocol Buffers - Google's data interchange format # Copyright 2008 Google Inc. All rights reserved. # 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 # met: # # * Redistributions of source code must retain the above copyright # notice, this list of conditions and the following disclaimer. # * Redistributions in binary form must reproduce the above # copyright notice, this list of conditions and the following disclaimer # in the documentation and/or other materials provided with the # distribution. # * Neither the name of Google Inc. nor the names of its # contributors may be used to endorse or promote products derived from # this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. """Descriptors essentially contain exactly the information found in a .proto file, in types that make this information accessible in Python. """ __author__ = 'robinson@google.com (Will Robinson)' import threading import warnings from google.protobuf.internal import api_implementation _USE_C_DESCRIPTORS = False if api_implementation.Type() != 'python': # Used by MakeDescriptor in cpp mode import binascii import os # pylint: disable=protected-access _message = api_implementation._c_module # TODO(jieluo): Remove this import after fix api_implementation if _message is None: from google.protobuf.pyext import _message _USE_C_DESCRIPTORS = True class Error(Exception): """Base error for this module.""" class TypeTransformationError(Error): """Error transforming between python proto type and corresponding C++ type.""" if _USE_C_DESCRIPTORS: # This metaclass allows to override the behavior of code like # isinstance(my_descriptor, FieldDescriptor) # and make it return True when the descriptor is an instance of the extension # type written in C++. class DescriptorMetaclass(type): def __instancecheck__(cls, obj): if super(DescriptorMetaclass, cls).__instancecheck__(obj): return True if isinstance(obj, cls._C_DESCRIPTOR_CLASS): return True return False else: # The standard metaclass; nothing changes. DescriptorMetaclass = type class _Lock(object): """Wrapper class of threading.Lock(), which is allowed by 'with'.""" def __new__(cls): self = object.__new__(cls) self._lock = threading.Lock() # pylint: disable=protected-access return self def __enter__(self): self._lock.acquire() def __exit__(self, exc_type, exc_value, exc_tb): self._lock.release() _lock = threading.Lock() def _Deprecated(name): if _Deprecated.count > 0: _Deprecated.count -= 1 warnings.warn( 'Call to deprecated create function %s(). Note: Create unlinked ' 'descriptors is going to go away. Please use get/find descriptors from ' 'generated code or query the descriptor_pool.' % name, category=DeprecationWarning, stacklevel=3) # Deprecated warnings will print 100 times at most which should be enough for # users to notice and do not cause timeout. _Deprecated.count = 100 _internal_create_key = object() class DescriptorBase(metaclass=DescriptorMetaclass): """Descriptors base class. This class is the base of all descriptor classes. It provides common options related functionality. Attributes: has_options: True if the descriptor has non-default options. Usually it is not necessary to read this -- just call GetOptions() which will happily return the default instance. However, it's sometimes useful for efficiency, and also useful inside the protobuf implementation to avoid some bootstrapping issues. """ if _USE_C_DESCRIPTORS: # The class, or tuple of classes, that are considered as "virtual # subclasses" of this descriptor class. _C_DESCRIPTOR_CLASS = () def __init__(self, options, serialized_options, options_class_name): """Initialize the descriptor given its options message and the name of the class of the options message. The name of the class is required in case the options message is None and has to be created. """ self._options = options self._options_class_name = options_class_name self._serialized_options = serialized_options # Does this descriptor have non-default options? self.has_options = (options is not None) or (serialized_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. This method returns the options set or creates the default options for the descriptor. """ if self._options: return self._options from google.protobuf import descriptor_pb2 try: options_class = getattr(descriptor_pb2, self._options_class_name) except AttributeError: raise RuntimeError('Unknown options class name %s!' % (self._options_class_name)) with _lock: if self._serialized_options is None: self._options = options_class() else: self._options = _ParseOptions(options_class(), self._serialized_options) return self._options class _NestedDescriptorBase(DescriptorBase): """Common class for descriptors that can be nested.""" def __init__(self, options, options_class_name, name, full_name, file, containing_type, serialized_start=None, serialized_end=None, serialized_options=None): """Constructor. Args: options: Protocol message options or None to use default message options. options_class_name (str): The class name of the above options. name (str): Name of this protocol message type. full_name (str): Fully-qualified name of this protocol message type, which will include protocol "package" name and the name of any enclosing types. file (FileDescriptor): Reference to file info. containing_type: if provided, this is a nested descriptor, with this descriptor as parent, otherwise None. serialized_start: The start index (inclusive) in block in the file.serialized_pb that describes this descriptor. serialized_end: The end index (exclusive) in block in the file.serialized_pb that describes this descriptor. serialized_options: Protocol message serialized options or None. """ super(_NestedDescriptorBase, self).__init__( options, serialized_options, options_class_name) self.name = name # TODO(falk): Add function to calculate full_name instead of having it in # memory? self.full_name = full_name self.file = file self.containing_type = containing_type self._serialized_start = serialized_start self._serialized_end = serialized_end def CopyToProto(self, proto): """Copies this to the matching proto in descriptor_pb2. Args: proto: An empty proto instance from descriptor_pb2. Raises: Error: If self couldn't be serialized, due to to few constructor arguments. """ if (self.file is not None and self._serialized_start is not None and self._serialized_end is not None): proto.ParseFromString(self.file.serialized_pb[ self._serialized_start:self._serialized_end]) else: raise Error('Descriptor does not contain serialization.') class Descriptor(_NestedDescriptorBase): """Descriptor for a protocol message type. Attributes: name (str): Name of this protocol message type. full_name (str): Fully-qualified name of this protocol message type, which will include protocol "package" name and the name of any enclosing types. containing_type (Descriptor): Reference to the descriptor of the type containing us, or None if this is top-level. fields (list[FieldDescriptor]): Field descriptors for all fields in this type. fields_by_number (dict(int, FieldDescriptor)): Same :class:`FieldDescriptor` objects as in :attr:`fields`, but indexed by "number" attribute in each FieldDescriptor. fields_by_name (dict(str, FieldDescriptor)): Same :class:`FieldDescriptor` objects as in :attr:`fields`, but indexed by "name" attribute in each :class:`FieldDescriptor`. nested_types (list[Descriptor]): Descriptor references for all protocol message types nested within this one. nested_types_by_name (dict(str, Descriptor)): Same Descriptor objects as in :attr:`nested_types`, but indexed by "name" attribute in each Descriptor. enum_types (list[EnumDescriptor]): :class:`EnumDescriptor` references for all enums contained within this type. enum_types_by_name (dict(str, EnumDescriptor)): Same :class:`EnumDescriptor` objects as in :attr:`enum_types`, but indexed by "name" attribute in each EnumDescriptor. enum_values_by_name (dict(str, EnumValueDescriptor)): Dict mapping from enum value name to :class:`EnumValueDescriptor` for that value. extensions (list[FieldDescriptor]): All extensions defined directly within this message type (NOT within a nested type). extensions_by_name (dict(str, FieldDescriptor)): Same FieldDescriptor objects as :attr:`extensions`, but indexed by "name" attribute of each FieldDescriptor. is_extendable (bool): Does this type define any extension ranges? oneofs (list[OneofDescriptor]): The list of descriptors for oneof fields in this message. oneofs_by_name (dict(str, OneofDescriptor)): Same objects as in :attr:`oneofs`, but indexed by "name" attribute. file (FileDescriptor): Reference to file descriptor. """ if _USE_C_DESCRIPTORS: _C_DESCRIPTOR_CLASS = _message.Descriptor def __new__( cls, name=None, full_name=None, filename=None, containing_type=None, fields=None, nested_types=None, enum_types=None, extensions=None, options=None, serialized_options=None, is_extendable=True, extension_ranges=None, oneofs=None, file=None, # pylint: disable=redefined-builtin serialized_start=None, serialized_end=None, syntax=None, create_key=None): _message.Message._CheckCalledFromGeneratedFile() return _message.default_pool.FindMessageTypeByName(full_name) # 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, serialized_options=None, is_extendable=True, extension_ranges=None, oneofs=None, file=None, serialized_start=None, serialized_end=None, # pylint: disable=redefined-builtin syntax=None, create_key=None): """Arguments to __init__() are as described in the description of Descriptor fields above. Note that filename is an obsolete argument, that is not used anymore. Please use file.name to access this as an attribute. """ if create_key is not _internal_create_key: _Deprecated('Descriptor') super(Descriptor, self).__init__( options, 'MessageOptions', name, full_name, file, containing_type, serialized_start=serialized_start, serialized_end=serialized_end, serialized_options=serialized_options) # We have fields in addition to fields_by_name and fields_by_number, # so that: # 1. Clients can index fields by "order in which they're listed." # 2. Clients can easily iterate over all fields with the terse # syntax: for f in descriptor.fields: ... self.fields = fields for field in self.fields: field.containing_type = self self.fields_by_number = dict((f.number, f) for f in fields) self.fields_by_name = dict((f.name, f) for f in fields) self._fields_by_camelcase_name = None 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 for enum_type in self.enum_types: enum_type.containing_type = self self.enum_types_by_name = dict((t.name, t) for t in enum_types) self.enum_values_by_name = dict( (v.name, v) for t in enum_types for v in t.values) self.extensions = extensions for extension in self.extensions: extension.extension_scope = self 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.syntax = syntax or "proto2" @property def fields_by_camelcase_name(self): """Same FieldDescriptor objects as in :attr:`fields`, but indexed by :attr:`FieldDescriptor.camelcase_name`. """ if self._fields_by_camelcase_name is None: self._fields_by_camelcase_name = dict( (f.camelcase_name, f) for f in self.fields) return self._fields_by_camelcase_name 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. Args: proto: An empty descriptor_pb2.DescriptorProto. """ # This function is overridden to give a better doc comment. super(Descriptor, self).CopyToProto(proto) # TODO(robinson): We should have aggressive checking here, # for example: # * If you specify a repeated field, you should not be allowed # to specify a default value. # * [Other examples here as needed]. # # TODO(robinson): for this and other *Descriptor classes, we # might also want to lock things down aggressively (e.g., # prevent clients from setting the attributes). Having # stronger invariants here in general will reduce the number # of runtime checks we must do in reflection.py... class FieldDescriptor(DescriptorBase): """Descriptor for a single field in a .proto file. 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 particularly relevant for extensions. index (int): Dense, 0-indexed index giving the order that this field textually appears within its message in the .proto file. number (int): Tag number declared for this field in the .proto file. type (int): (One of the TYPE_* constants below) Declared type. cpp_type (int): (One of the CPPTYPE_* constants below) C++ type used to represent this field. label (int): (One of the LABEL_* constants below) Tells whether this field is optional, required, or repeated. has_default_value (bool): True if this field has a default value defined, otherwise false. default_value (Varies): Default value of this field. Only meaningful for non-repeated scalar fields. Repeated fields should always set this to [], and non-repeated composite fields should always set this to None. containing_type (Descriptor): Descriptor of the protocol message type that contains this field. Set by the Descriptor constructor if we're passed into one. Somewhat confusingly, for extension fields, this is the descriptor of the EXTENDED message, not the descriptor of the message containing this field. (See is_extension and extension_scope below). message_type (Descriptor): If a composite field, a descriptor of the message type contained in this field. Otherwise, this is None. enum_type (EnumDescriptor): If this field contains an enum, a descriptor of that enum. Otherwise, this is None. is_extension: True iff this describes an extension field. extension_scope (Descriptor): Only meaningful if is_extension is True. Gives the message that immediately contains this extension field. Will be None iff we're a top-level (file-level) extension field. 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. file (FileDescriptor): Reference to file descriptor. """ # Must be consistent with C++ FieldDescriptor::Type enum in # descriptor.h. # # TODO(robinson): Find a way to eliminate this repetition. TYPE_DOUBLE = 1 TYPE_FLOAT = 2 TYPE_INT64 = 3 TYPE_UINT64 = 4 TYPE_INT32 = 5 TYPE_FIXED64 = 6 TYPE_FIXED32 = 7 TYPE_BOOL = 8 TYPE_STRING = 9 TYPE_GROUP = 10 TYPE_MESSAGE = 11 TYPE_BYTES = 12 TYPE_UINT32 = 13 TYPE_ENUM = 14 TYPE_SFIXED32 = 15 TYPE_SFIXED64 = 16 TYPE_SINT32 = 17 TYPE_SINT64 = 18 MAX_TYPE = 18 # Must be consistent with C++ FieldDescriptor::CppType enum in # descriptor.h. # # TODO(robinson): Find a way to eliminate this repetition. CPPTYPE_INT32 = 1 CPPTYPE_INT64 = 2 CPPTYPE_UINT32 = 3 CPPTYPE_UINT64 = 4 CPPTYPE_DOUBLE = 5 CPPTYPE_FLOAT = 6 CPPTYPE_BOOL = 7 CPPTYPE_ENUM = 8 CPPTYPE_STRING = 9 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. # # TODO(robinson): Find a way to eliminate this repetition. LABEL_OPTIONAL = 1 LABEL_REQUIRED = 2 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 if _USE_C_DESCRIPTORS: _C_DESCRIPTOR_CLASS = _message.FieldDescriptor def __new__(cls, name, full_name, index, number, type, cpp_type, label, default_value, message_type, enum_type, containing_type, is_extension, extension_scope, options=None, serialized_options=None, has_default_value=True, containing_oneof=None, json_name=None, file=None, create_key=None): # pylint: disable=redefined-builtin _message.Message._CheckCalledFromGeneratedFile() if is_extension: return _message.default_pool.FindExtensionByName(full_name) else: return _message.default_pool.FindFieldByName(full_name) 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, serialized_options=None, has_default_value=True, containing_oneof=None, json_name=None, file=None, create_key=None): # pylint: disable=redefined-builtin """The arguments are as described in the description of FieldDescriptor attributes above. Note that containing_type may be None, and may be set later if necessary (to deal with circular references between message types, for example). Likewise for extension_scope. """ if create_key is not _internal_create_key: _Deprecated('FieldDescriptor') super(FieldDescriptor, self).__init__( options, serialized_options, 'FieldOptions') self.name = name self.full_name = full_name self.file = file self._camelcase_name = None if json_name is None: self.json_name = _ToJsonName(name) else: self.json_name = json_name self.index = index self.number = number self.type = type self.cpp_type = cpp_type self.label = label self.has_default_value = has_default_value self.default_value = default_value self.containing_type = containing_type self.message_type = message_type self.enum_type = enum_type self.is_extension = is_extension self.extension_scope = extension_scope self.containing_oneof = containing_oneof if api_implementation.Type() == 'python': self._cdescriptor = None else: if is_extension: self._cdescriptor = _message.default_pool.FindExtensionByName(full_name) else: self._cdescriptor = _message.default_pool.FindFieldByName(full_name) @property def camelcase_name(self): """Camelcase name of this field. Returns: str: the name in CamelCase. """ if self._camelcase_name is None: self._camelcase_name = _ToCamelCase(self.name) return self._camelcase_name @property def has_presence(self): """Whether the field distinguishes between unpopulated and default values. Raises: RuntimeError: singular field that is not linked with message nor file. """ if self.label == FieldDescriptor.LABEL_REPEATED: return False if (self.cpp_type == FieldDescriptor.CPPTYPE_MESSAGE or self.containing_oneof): return True # self.containing_type is used here instead of self.file for legacy # compatibility. FieldDescriptor.file was added in cl/153110619 # Some old/generated code didn't link file to FieldDescriptor. # TODO(jieluo): remove syntax usage b/240619313 return self.containing_type.syntax == 'proto2' @property def is_packed(self): """Returns if the field is packed.""" if self.label != FieldDescriptor.LABEL_REPEATED: return False field_type = self.type if (field_type == FieldDescriptor.TYPE_STRING or field_type == FieldDescriptor.TYPE_GROUP or field_type == FieldDescriptor.TYPE_MESSAGE or field_type == FieldDescriptor.TYPE_BYTES): return False if self.containing_type.syntax == 'proto2': return self.has_options and self.GetOptions().packed else: return (not self.has_options or not self.GetOptions().HasField('packed') or self.GetOptions().packed) @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: int: 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): """Descriptor for an enum defined in a .proto file. Attributes: name (str): Name of the enum type. full_name (str): Full name of the type, including package name and any enclosing type(s). values (list[EnumValueDescriptor]): List of the values in this enum. values_by_name (dict(str, EnumValueDescriptor)): Same as :attr:`values`, but indexed by the "name" field of each EnumValueDescriptor. values_by_number (dict(int, EnumValueDescriptor)): Same as :attr:`values`, but indexed by the "number" field of each EnumValueDescriptor. containing_type (Descriptor): Descriptor of the immediate containing type of this enum, or None if this is an enum defined at the top level in a .proto file. Set by Descriptor's constructor if we're passed into one. file (FileDescriptor): Reference to file descriptor. options (descriptor_pb2.EnumOptions): Enum options message or None to use default enum options. """ if _USE_C_DESCRIPTORS: _C_DESCRIPTOR_CLASS = _message.EnumDescriptor def __new__(cls, name, full_name, filename, values, containing_type=None, options=None, serialized_options=None, file=None, # pylint: disable=redefined-builtin serialized_start=None, serialized_end=None, create_key=None): _message.Message._CheckCalledFromGeneratedFile() return _message.default_pool.FindEnumTypeByName(full_name) def __init__(self, name, full_name, filename, values, containing_type=None, options=None, serialized_options=None, file=None, # pylint: disable=redefined-builtin serialized_start=None, serialized_end=None, create_key=None): """Arguments are as described in the attribute description above. Note that filename is an obsolete argument, that is not used anymore. Please use file.name to access this as an attribute. """ if create_key is not _internal_create_key: _Deprecated('EnumDescriptor') super(EnumDescriptor, self).__init__( options, 'EnumOptions', name, full_name, file, containing_type, serialized_start=serialized_start, serialized_end=serialized_end, serialized_options=serialized_options) self.values = values for value in self.values: value.type = self self.values_by_name = dict((v.name, v) for v in values) # Values are reversed to ensure that the first alias is retained. self.values_by_number = dict((v.number, v) for v in reversed(values)) @property def is_closed(self): """Returns true whether this is a "closed" enum. This means that it: - Has a fixed set of values, rather than being equivalent to an int32. - Encountering values not in this set causes them to be treated as unknown fields. - The first value (i.e., the default) may be nonzero. WARNING: Some runtimes currently have a quirk where non-closed enums are treated as closed when used as the type of fields defined in a `syntax = proto2;` file. This quirk is not present in all runtimes; as of writing, we know that: - C++, Java, and C++-based Python share this quirk. - UPB and UPB-based Python do not. - PHP and Ruby treat all enums as open regardless of declaration. Care should be taken when using this function to respect the target runtime's enum handling quirks. """ return self.file.syntax == 'proto2' def CopyToProto(self, proto): """Copies this to a descriptor_pb2.EnumDescriptorProto. Args: proto (descriptor_pb2.EnumDescriptorProto): An empty descriptor proto. """ # This function is overridden to give a better doc comment. super(EnumDescriptor, self).CopyToProto(proto) class EnumValueDescriptor(DescriptorBase): """Descriptor for a single value within an enum. Attributes: name (str): Name of this value. index (int): Dense, 0-indexed index giving the order that this value appears textually within its enum in the .proto file. number (int): Actual number assigned to this enum value. type (EnumDescriptor): :class:`EnumDescriptor` to which this value belongs. Set by :class:`EnumDescriptor`'s constructor if we're passed into one. options (descriptor_pb2.EnumValueOptions): Enum value options message or None to use default enum value options options. """ if _USE_C_DESCRIPTORS: _C_DESCRIPTOR_CLASS = _message.EnumValueDescriptor def __new__(cls, name, index, number, type=None, # pylint: disable=redefined-builtin options=None, serialized_options=None, create_key=None): _message.Message._CheckCalledFromGeneratedFile() # There is no way we can build a complete EnumValueDescriptor with the # given parameters (the name of the Enum is not known, for example). # Fortunately generated files just pass it to the EnumDescriptor() # constructor, which will ignore it, so returning None is good enough. return None def __init__(self, name, index, number, type=None, # pylint: disable=redefined-builtin options=None, serialized_options=None, create_key=None): """Arguments are as described in the attribute description above.""" if create_key is not _internal_create_key: _Deprecated('EnumValueDescriptor') super(EnumValueDescriptor, self).__init__( options, serialized_options, 'EnumValueOptions') self.name = name self.index = index self.number = number self.type = type class OneofDescriptor(DescriptorBase): """Descriptor for a oneof field. Attributes: 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): :class:`Descriptor` of the protocol message type that contains this field. Set by the :class:`Descriptor` constructor if we're passed into one. fields (list[FieldDescriptor]): The list of field descriptors this oneof can contain. """ if _USE_C_DESCRIPTORS: _C_DESCRIPTOR_CLASS = _message.OneofDescriptor def __new__( cls, name, full_name, index, containing_type, fields, options=None, serialized_options=None, create_key=None): _message.Message._CheckCalledFromGeneratedFile() return _message.default_pool.FindOneofByName(full_name) def __init__( self, name, full_name, index, containing_type, fields, options=None, serialized_options=None, create_key=None): """Arguments are as described in the attribute description above.""" if create_key is not _internal_create_key: _Deprecated('OneofDescriptor') super(OneofDescriptor, self).__init__( options, serialized_options, 'OneofOptions') 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. Attributes: name (str): Name of the service. full_name (str): Full name of the service, including package name. index (int): 0-indexed index giving the order that this services definition appears within the .proto file. methods (list[MethodDescriptor]): List of methods provided by this service. methods_by_name (dict(str, MethodDescriptor)): Same :class:`MethodDescriptor` objects as in :attr:`methods_by_name`, but indexed by "name" attribute in each :class:`MethodDescriptor`. options (descriptor_pb2.ServiceOptions): Service options message or None to use default service options. file (FileDescriptor): Reference to file info. """ if _USE_C_DESCRIPTORS: _C_DESCRIPTOR_CLASS = _message.ServiceDescriptor def __new__( cls, name=None, full_name=None, index=None, methods=None, options=None, serialized_options=None, file=None, # pylint: disable=redefined-builtin serialized_start=None, serialized_end=None, create_key=None): _message.Message._CheckCalledFromGeneratedFile() # pylint: disable=protected-access return _message.default_pool.FindServiceByName(full_name) def __init__(self, name, full_name, index, methods, options=None, serialized_options=None, file=None, # pylint: disable=redefined-builtin serialized_start=None, serialized_end=None, create_key=None): if create_key is not _internal_create_key: _Deprecated('ServiceDescriptor') super(ServiceDescriptor, self).__init__( options, 'ServiceOptions', name, full_name, file, None, serialized_start=serialized_start, serialized_end=serialized_end, serialized_options=serialized_options) self.index = index self.methods = methods self.methods_by_name = dict((m.name, m) for m in methods) # Set the containing service for each method in this service. for method in self.methods: method.containing_service = self def FindMethodByName(self, name): """Searches for the specified method, and returns its descriptor. Args: name (str): Name of the method. Returns: MethodDescriptor: The descriptor for the requested method. Raises: KeyError: if the method cannot be found in the service. """ return self.methods_by_name[name] def CopyToProto(self, proto): """Copies this to a descriptor_pb2.ServiceDescriptorProto. Args: proto (descriptor_pb2.ServiceDescriptorProto): An empty descriptor proto. """ # This function is overridden to give a better doc comment. super(ServiceDescriptor, self).CopyToProto(proto) class MethodDescriptor(DescriptorBase): """Descriptor for a method in a service. Attributes: name (str): Name of the method within the service. full_name (str): Full name of method. index (int): 0-indexed index of the method inside the service. containing_service (ServiceDescriptor): The service that contains this method. input_type (Descriptor): The descriptor of the message that this method accepts. output_type (Descriptor): The descriptor of the message that this method returns. client_streaming (bool): Whether this method uses client streaming. server_streaming (bool): Whether this method uses server streaming. options (descriptor_pb2.MethodOptions or None): Method options message, or None to use default method options. """ if _USE_C_DESCRIPTORS: _C_DESCRIPTOR_CLASS = _message.MethodDescriptor def __new__(cls, name, full_name, index, containing_service, input_type, output_type, client_streaming=False, server_streaming=False, options=None, serialized_options=None, create_key=None): _message.Message._CheckCalledFromGeneratedFile() # pylint: disable=protected-access return _message.default_pool.FindMethodByName(full_name) def __init__(self, name, full_name, index, containing_service, input_type, output_type, client_streaming=False, server_streaming=False, options=None, serialized_options=None, create_key=None): """The arguments are as described in the description of MethodDescriptor attributes above. Note that containing_service may be None, and may be set later if necessary. """ if create_key is not _internal_create_key: _Deprecated('MethodDescriptor') super(MethodDescriptor, self).__init__( options, serialized_options, 'MethodOptions') self.name = name self.full_name = full_name self.index = index self.containing_service = containing_service self.input_type = input_type self.output_type = output_type self.client_streaming = client_streaming self.server_streaming = server_streaming def CopyToProto(self, proto): """Copies this to a descriptor_pb2.MethodDescriptorProto. Args: proto (descriptor_pb2.MethodDescriptorProto): An empty descriptor proto. Raises: Error: If self couldn't be serialized, due to too few constructor arguments. """ if self.containing_service is not None: from google.protobuf import descriptor_pb2 service_proto = descriptor_pb2.ServiceDescriptorProto() self.containing_service.CopyToProto(service_proto) proto.CopyFrom(service_proto.method[self.index]) else: raise Error('Descriptor does not contain a service.') class FileDescriptor(DescriptorBase): """Descriptor for a file. Mimics the descriptor_pb2.FileDescriptorProto. Note that :attr:`enum_types_by_name`, :attr:`extensions_by_name`, and :attr:`dependencies` fields are only set by the :py:mod:`google.protobuf.message_factory` module, and not by the generated proto code. Attributes: name (str): Name of file, relative to root of source tree. package (str): Name of the package syntax (str): string indicating syntax of the file (can be "proto2" or "proto3") serialized_pb (bytes): Byte string of serialized :class:`descriptor_pb2.FileDescriptorProto`. dependencies (list[FileDescriptor]): List of other :class:`FileDescriptor` objects this :class:`FileDescriptor` depends on. public_dependencies (list[FileDescriptor]): A subset of :attr:`dependencies`, which were declared as "public". message_types_by_name (dict(str, Descriptor)): Mapping from message names to their :class:`Descriptor`. enum_types_by_name (dict(str, EnumDescriptor)): Mapping from enum names to their :class:`EnumDescriptor`. extensions_by_name (dict(str, FieldDescriptor)): Mapping from extension names declared at file scope to their :class:`FieldDescriptor`. services_by_name (dict(str, ServiceDescriptor)): Mapping from services' names to their :class:`ServiceDescriptor`. pool (DescriptorPool): The pool this descriptor belongs to. When not passed to the constructor, the global default pool is used. """ if _USE_C_DESCRIPTORS: _C_DESCRIPTOR_CLASS = _message.FileDescriptor def __new__(cls, name, package, options=None, serialized_options=None, serialized_pb=None, dependencies=None, public_dependencies=None, syntax=None, pool=None, create_key=None): # FileDescriptor() is called from various places, not only from generated # files, to register dynamic proto files and messages. # pylint: disable=g-explicit-bool-comparison if serialized_pb: return _message.default_pool.AddSerializedFile(serialized_pb) else: return super(FileDescriptor, cls).__new__(cls) def __init__(self, name, package, options=None, serialized_options=None, serialized_pb=None, dependencies=None, public_dependencies=None, syntax=None, pool=None, create_key=None): """Constructor.""" if create_key is not _internal_create_key: _Deprecated('FileDescriptor') super(FileDescriptor, self).__init__( options, serialized_options, 'FileOptions') if pool is None: from google.protobuf import descriptor_pool pool = descriptor_pool.Default() self.pool = pool self.message_types_by_name = {} self.name = name self.package = package self.syntax = syntax or "proto2" self.serialized_pb = serialized_pb self.enum_types_by_name = {} self.extensions_by_name = {} self.services_by_name = {} self.dependencies = (dependencies or []) self.public_dependencies = (public_dependencies or []) def CopyToProto(self, proto): """Copies this to a descriptor_pb2.FileDescriptorProto. Args: proto: An empty descriptor_pb2.FileDescriptorProto. """ proto.ParseFromString(self.serialized_pb) def _ParseOptions(message, string): """Parses serialized options. This helper function is used to parse serialized options in generated proto2 files. It must not be used outside proto2. """ message.ParseFromString(string) return message def _ToCamelCase(name): """Converts name to camel-case and returns it.""" capitalize_next = False result = [] for c in name: if c == '_': if result: capitalize_next = True elif capitalize_next: result.append(c.upper()) capitalize_next = False else: result += c # Lower-case the first letter. if result and result[0].isupper(): result[0] = result[0].lower() return ''.join(result) def _OptionsOrNone(descriptor_proto): """Returns the value of the field `options`, or None if it is not set.""" if descriptor_proto.HasField('options'): return descriptor_proto.options else: return None def _ToJsonName(name): """Converts name to Json name and returns it.""" capitalize_next = False result = [] for c in name: if c == '_': capitalize_next = True elif capitalize_next: result.append(c.upper()) capitalize_next = False else: result += c return ''.join(result) def MakeDescriptor(desc_proto, package='', build_file_if_cpp=True, syntax=None): """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. syntax: The syntax/semantics that should be used. Set to "proto3" to get proto3 field presence semantics. Returns: A Descriptor for protobuf messages. """ if api_implementation.Type() != 'python' 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 the descriptor pool # accepts our FileDescriptorProto, but it is not important what that file # name is actually set to. proto_name = binascii.hexlify(os.urandom(16)).decode('ascii') 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' _message.default_pool.Add(file_descriptor_proto) result = _message.default_pool.FindFileByName(file_descriptor_proto.name) if _USE_C_DESCRIPTORS: return result.message_types_by_name[desc_proto.name] 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, create_key=_internal_create_key) for ii, enum_val in enumerate(enum_proto.value)], create_key=_internal_create_key) 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, syntax=syntax) 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.json_name: json_name = field_proto.json_name else: json_name = 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, options=_OptionsOrNone(field_proto), has_default_value=False, json_name=json_name, create_key=_internal_create_key) fields.append(field) desc_name = '.'.join(full_message_name) return Descriptor(desc_proto.name, desc_name, None, None, fields, list(nested_types.values()), list(enum_types.values()), [], options=_OptionsOrNone(desc_proto), create_key=_internal_create_key)
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