builder.py

# Protocol Buffers - Google's data interchange format
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"""Builds descriptors, message classes and services for generated _pb2.py.

This file is only called in python generated _pb2.py files. It builds
descriptors, message classes and services that users can directly use
in generated code.
"""

__author__ = 'jieluo@google.com (Jie Luo)'

from google.protobuf.internal import enum_type_wrapper
from google.protobuf import message as _message
from google.protobuf import reflection as _reflection
from google.protobuf import symbol_database as _symbol_database

_sym_db = _symbol_database.Default()


def BuildMessageAndEnumDescriptors(file_des, module):
  """Builds message and enum descriptors.

  Args:
    file_des: FileDescriptor of the .proto file
    module: Generated _pb2 module
  """

  def BuildNestedDescriptors(msg_des, prefix):
    for (name, nested_msg) in msg_des.nested_types_by_name.items():
      module_name = prefix + name.upper()
      module[module_name] = nested_msg
      BuildNestedDescriptors(nested_msg, module_name + '_')
    for enum_des in msg_des.enum_types:
      module[prefix + enum_des.name.upper()] = enum_des

  for (name, msg_des) in file_des.message_types_by_name.items():
    module_name = '_' + name.upper()
    module[module_name] = msg_des
    BuildNestedDescriptors(msg_des, module_name + '_')


def BuildTopDescriptorsAndMessages(file_des, module_name, module):
  """Builds top level descriptors and message classes.

  Args:
    file_des: FileDescriptor of the .proto file
    module_name: str, the name of generated _pb2 module
    module: Generated _pb2 module
  """

  def BuildMessage(msg_des):
    create_dict = {}
    for (name, nested_msg) in msg_des.nested_types_by_name.items():
      create_dict[name] = BuildMessage(nested_msg)
    create_dict['DESCRIPTOR'] = msg_des
    create_dict['__module__'] = module_name
    message_class = _reflection.GeneratedProtocolMessageType(
        msg_des.name, (_message.Message,), create_dict)
    _sym_db.RegisterMessage(message_class)
    return message_class

  # top level enums
  for (name, enum_des) in file_des.enum_types_by_name.items():
    module['_' + name.upper()] = enum_des
    module[name] = enum_type_wrapper.EnumTypeWrapper(enum_des)
    for enum_value in enum_des.values:
      module[enum_value.name] = enum_value.number

  # top level extensions
  for (name, extension_des) in file_des.extensions_by_name.items():
    module[name.upper() + '_FIELD_NUMBER'] = extension_des.number
    module[name] = extension_des

  # services
  for (name, service) in file_des.services_by_name.items():
    module['_' + name.upper()] = service

  # Build messages.
  for (name, msg_des) in file_des.message_types_by_name.items():
    module[name] = BuildMessage(msg_des)


def BuildServices(file_des, module_name, module):
  """Builds services classes and services stub class.

  Args:
    file_des: FileDescriptor of the .proto file
    module_name: str, the name of generated _pb2 module
    module: Generated _pb2 module
  """
  # pylint: disable=g-import-not-at-top
  from google.protobuf import service as _service
  from google.protobuf import service_reflection
  # pylint: enable=g-import-not-at-top
  for (name, service) in file_des.services_by_name.items():
    module[name] = service_reflection.GeneratedServiceType(
        name, (_service.Service,),
        dict(DESCRIPTOR=service, __module__=module_name))
    stub_name = name + '_Stub'
    module[stub_name] = service_reflection.GeneratedServiceStubType(
        stub_name, (module[name],),
        dict(DESCRIPTOR=service, __module__=module_name))