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File Content: `symbol_database.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.

"""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')()
"""


from google.protobuf import descriptor_pool
from google.protobuf import message_factory


class SymbolDatabase(message_factory.MessageFactory):
  """A database of Python generated symbols."""

  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 message.Message, to 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: a descriptor.MessageDescriptor.
    """
    self.pool.AddDescriptor(message_descriptor)

  def RegisterEnumDescriptor(self, enum_descriptor):
    """Registers the given enum descriptor in the local database.

    Args:
      enum_descriptor: a descriptor.EnumDescriptor.

    Returns:
      The provided descriptor.
    """
    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: a descriptor.ServiceDescriptor.

    Returns:
      The provided descriptor.
    """
    self.pool.AddServiceDescriptor(service_descriptor)

  def RegisterFileDescriptor(self, file_descriptor):
    """Registers the given file descriptor in the local database.

    Args:
      file_descriptor: a descriptor.FileDescriptor.

    Returns:
      The provided descriptor.
    """
    self.pool.AddFileDescriptor(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: A 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(amauryfa): 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: 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 list(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

Name	Size	Permission
__pycache__	---	0755
compiler	---	0755
internal	---	0755
pyext	---	0755
util	---	0755
__init__.py	1890 bytes	0644
any_pb2.py	2686 bytes	0644
any_test_pb2.py	3205 bytes	0644
api_pb2.py	10895 bytes	0644
descriptor.py	39605 bytes	0644
descriptor_database.py	5932 bytes	0644
descriptor_pb2.py	89217 bytes	0644
descriptor_pool.py	36639 bytes	0644
duration_pb2.py	2780 bytes	0644
empty_pb2.py	1951 bytes	0644
field_mask_pb2.py	2422 bytes	0644
json_format.py	29203 bytes	0644
map_proto2_unittest_pb2.py	55897 bytes	0644
map_unittest_pb2.py	127423 bytes	0644
message.py	11454 bytes	0644
message_factory.py	6291 bytes	0644
proto_builder.py	5208 bytes	0644
reflection.py	4568 bytes	0644
service.py	9144 bytes	0644
service_reflection.py	11023 bytes	0644
source_context_pb2.py	2537 bytes	0644
struct_pb2.py	10900 bytes	0644
symbol_database.py	6429 bytes	0644
test_messages_proto2_pb2.py	107724 bytes	0644
test_messages_proto3_pb2.py	117807 bytes	0644
text_encoding.py	4617 bytes	0644
text_format.py	50886 bytes	0644
timestamp_pb2.py	2800 bytes	0644
type_pb2.py	21859 bytes	0644
unittest_arena_pb2.py	4507 bytes	0644
unittest_custom_options_pb2.py	90298 bytes	0644
unittest_import_pb2.py	4601 bytes	0644
unittest_import_public_pb2.py	2342 bytes	0644
unittest_mset_pb2.py	9959 bytes	0644
unittest_mset_wire_format_pb2.py	3854 bytes	0644
unittest_no_arena_import_pb2.py	2233 bytes	0644
unittest_no_arena_pb2.py	52395 bytes	0644
unittest_no_generic_services_pb2.py	4245 bytes	0644
unittest_pb2.py	343268 bytes	0644
unittest_proto3_arena_pb2.py	60577 bytes	0644
wrappers_pb2.py	11531 bytes	0644

File Content: symbol_database.py

File Content: `symbol_database.py`