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Diffstat (limited to '.venv/lib/python3.12/site-packages/google/protobuf/symbol_database.py')
-rw-r--r-- | .venv/lib/python3.12/site-packages/google/protobuf/symbol_database.py | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/google/protobuf/symbol_database.py b/.venv/lib/python3.12/site-packages/google/protobuf/symbol_database.py new file mode 100644 index 00000000..1941e811 --- /dev/null +++ b/.venv/lib/python3.12/site-packages/google/protobuf/symbol_database.py @@ -0,0 +1,197 @@ +# Protocol Buffers - Google's data interchange format +# Copyright 2008 Google Inc. All rights reserved. +# +# Use of this source code is governed by a BSD-style +# license that can be found in the LICENSE file or at +# https://developers.google.com/open-source/licenses/bsd + +"""A database of Python protocol buffer generated symbols. + +SymbolDatabase is the MessageFactory for messages generated at compile time, +and makes it easy to create new instances of a registered type, given only the +type's protocol buffer symbol name. + +Example usage:: + + db = symbol_database.SymbolDatabase() + + # Register symbols of interest, from one or multiple files. + db.RegisterFileDescriptor(my_proto_pb2.DESCRIPTOR) + db.RegisterMessage(my_proto_pb2.MyMessage) + db.RegisterEnumDescriptor(my_proto_pb2.MyEnum.DESCRIPTOR) + + # The database can be used as a MessageFactory, to generate types based on + # their name: + types = db.GetMessages(['my_proto.proto']) + my_message_instance = types['MyMessage']() + + # The database's underlying descriptor pool can be queried, so it's not + # necessary to know a type's filename to be able to generate it: + filename = db.pool.FindFileContainingSymbol('MyMessage') + my_message_instance = db.GetMessages([filename])['MyMessage']() + + # This functionality is also provided directly via a convenience method: + my_message_instance = db.GetSymbol('MyMessage')() +""" + +import warnings + +from google.protobuf.internal import api_implementation +from google.protobuf import descriptor_pool +from google.protobuf import message_factory + + +class SymbolDatabase(): + """A database of Python generated symbols.""" + + # local cache of registered classes. + _classes = {} + + def __init__(self, pool=None): + """Initializes a new SymbolDatabase.""" + self.pool = pool or descriptor_pool.DescriptorPool() + + def GetPrototype(self, descriptor): + warnings.warn('SymbolDatabase.GetPrototype() is deprecated. Please ' + 'use message_factory.GetMessageClass() instead. ' + 'SymbolDatabase.GetPrototype() will be removed soon.') + return message_factory.GetMessageClass(descriptor) + + def CreatePrototype(self, descriptor): + warnings.warn('Directly call CreatePrototype() is wrong. Please use ' + 'message_factory.GetMessageClass() instead. ' + 'SymbolDatabase.CreatePrototype() will be removed soon.') + return message_factory._InternalCreateMessageClass(descriptor) + + def GetMessages(self, files): + warnings.warn('SymbolDatabase.GetMessages() is deprecated. Please use ' + 'message_factory.GetMessageClassedForFiles() instead. ' + 'SymbolDatabase.GetMessages() will be removed soon.') + return message_factory.GetMessageClassedForFiles(files, self.pool) + + def RegisterMessage(self, message): + """Registers the given message type in the local database. + + Calls to GetSymbol() and GetMessages() will return messages registered here. + + Args: + message: A :class:`google.protobuf.message.Message` subclass (or + instance); its descriptor will be registered. + + Returns: + The provided message. + """ + + desc = message.DESCRIPTOR + self._classes[desc] = message + self.RegisterMessageDescriptor(desc) + return message + + def RegisterMessageDescriptor(self, message_descriptor): + """Registers the given message descriptor in the local database. + + Args: + message_descriptor (Descriptor): the message descriptor to add. + """ + if api_implementation.Type() == 'python': + # pylint: disable=protected-access + self.pool._AddDescriptor(message_descriptor) + + def RegisterEnumDescriptor(self, enum_descriptor): + """Registers the given enum descriptor in the local database. + + Args: + enum_descriptor (EnumDescriptor): The enum descriptor to register. + + Returns: + EnumDescriptor: The provided descriptor. + """ + if api_implementation.Type() == 'python': + # pylint: disable=protected-access + self.pool._AddEnumDescriptor(enum_descriptor) + return enum_descriptor + + def RegisterServiceDescriptor(self, service_descriptor): + """Registers the given service descriptor in the local database. + + Args: + service_descriptor (ServiceDescriptor): the service descriptor to + register. + """ + if api_implementation.Type() == 'python': + # pylint: disable=protected-access + self.pool._AddServiceDescriptor(service_descriptor) + + def RegisterFileDescriptor(self, file_descriptor): + """Registers the given file descriptor in the local database. + + Args: + file_descriptor (FileDescriptor): The file descriptor to register. + """ + if api_implementation.Type() == 'python': + # pylint: disable=protected-access + self.pool._InternalAddFileDescriptor(file_descriptor) + + def GetSymbol(self, symbol): + """Tries to find a symbol in the local database. + + Currently, this method only returns message.Message instances, however, if + may be extended in future to support other symbol types. + + Args: + symbol (str): a protocol buffer symbol. + + Returns: + A Python class corresponding to the symbol. + + Raises: + KeyError: if the symbol could not be found. + """ + + return self._classes[self.pool.FindMessageTypeByName(symbol)] + + def GetMessages(self, files): + # TODO: Fix the differences with MessageFactory. + """Gets all registered messages from a specified file. + + Only messages already created and registered will be returned; (this is the + case for imported _pb2 modules) + But unlike MessageFactory, this version also returns already defined nested + messages, but does not register any message extensions. + + Args: + files (list[str]): The file names to extract messages from. + + Returns: + A dictionary mapping proto names to the message classes. + + Raises: + KeyError: if a file could not be found. + """ + + def _GetAllMessages(desc): + """Walk a message Descriptor and recursively yields all message names.""" + yield desc + for msg_desc in desc.nested_types: + for nested_desc in _GetAllMessages(msg_desc): + yield nested_desc + + result = {} + for file_name in files: + file_desc = self.pool.FindFileByName(file_name) + for msg_desc in file_desc.message_types_by_name.values(): + for desc in _GetAllMessages(msg_desc): + try: + result[desc.full_name] = self._classes[desc] + except KeyError: + # This descriptor has no registered class, skip it. + pass + return result + + +_DEFAULT = SymbolDatabase(pool=descriptor_pool.Default()) + + +def Default(): + """Returns the default SymbolDatabase.""" + return _DEFAULT |