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Filename : symbol_database.py
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# 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 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