/usr/lib/python3/dist-packages/protorpc/definition.py is in python3-protorpc-standalone 0.9.1-3.
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#
# Copyright 2010 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
"""Stub library."""
__author__ = 'rafek@google.com (Rafe Kaplan)'
import new
import sys
import urllib2
from . import descriptor
from . import message_types
from . import messages
from . import protobuf
from . import remote
from . import util
__all__ = [
'define_enum',
'define_field',
'define_file',
'define_message',
'define_service',
'import_file',
'import_file_set',
]
# Map variant back to message field classes.
def _build_variant_map():
"""Map variants to fields.
Returns:
Dictionary mapping field variant to its associated field type.
"""
result = {}
for name in dir(messages):
value = getattr(messages, name)
if isinstance(value, type) and issubclass(value, messages.Field):
for variant in getattr(value, 'VARIANTS', []):
result[variant] = value
return result
_VARIANT_MAP = _build_variant_map()
_MESSAGE_TYPE_MAP = {
message_types.DateTimeMessage.definition_name(): message_types.DateTimeField,
}
def _get_or_define_module(full_name, modules):
"""Helper method for defining new modules.
Args:
full_name: Fully qualified name of module to create or return.
modules: Dictionary of all modules. Defaults to sys.modules.
Returns:
Named module if found in 'modules', else creates new module and inserts in
'modules'. Will also construct parent modules if necessary.
"""
module = modules.get(full_name)
if not module:
module = new.module(full_name)
modules[full_name] = module
split_name = full_name.rsplit('.', 1)
if len(split_name) > 1:
parent_module_name, sub_module_name = split_name
parent_module = _get_or_define_module(parent_module_name, modules)
setattr(parent_module, sub_module_name, module)
return module
def define_enum(enum_descriptor, module_name):
"""Define Enum class from descriptor.
Args:
enum_descriptor: EnumDescriptor to build Enum class from.
module_name: Module name to give new descriptor class.
Returns:
New messages.Enum sub-class as described by enum_descriptor.
"""
enum_values = enum_descriptor.values or []
class_dict = dict((value.name, value.number) for value in enum_values)
class_dict['__module__'] = module_name
return type(str(enum_descriptor.name), (messages.Enum,), class_dict)
def define_field(field_descriptor):
"""Define Field instance from descriptor.
Args:
field_descriptor: FieldDescriptor class to build field instance from.
Returns:
New field instance as described by enum_descriptor.
"""
field_class = _VARIANT_MAP[field_descriptor.variant]
params = {'number': field_descriptor.number,
'variant': field_descriptor.variant,
}
if field_descriptor.label == descriptor.FieldDescriptor.Label.REQUIRED:
params['required'] = True
elif field_descriptor.label == descriptor.FieldDescriptor.Label.REPEATED:
params['repeated'] = True
message_type_field = _MESSAGE_TYPE_MAP.get(field_descriptor.type_name)
if message_type_field:
return message_type_field(**params)
elif field_class in (messages.EnumField, messages.MessageField):
return field_class(field_descriptor.type_name, **params)
else:
if field_descriptor.default_value:
value = field_descriptor.default_value
try:
value = descriptor._DEFAULT_FROM_STRING_MAP[field_class](value)
except (TypeError, ValueError, KeyError):
pass # Let the value pass to the constructor.
params['default'] = value
return field_class(**params)
def define_message(message_descriptor, module_name):
"""Define Message class from descriptor.
Args:
message_descriptor: MessageDescriptor to describe message class from.
module_name: Module name to give to new descriptor class.
Returns:
New messages.Message sub-class as described by message_descriptor.
"""
class_dict = {'__module__': module_name}
for enum in message_descriptor.enum_types or []:
enum_instance = define_enum(enum, module_name)
class_dict[enum.name] = enum_instance
# TODO(rafek): support nested messages when supported by descriptor.
for field in message_descriptor.fields or []:
field_instance = define_field(field)
class_dict[field.name] = field_instance
class_name = message_descriptor.name.encode('utf-8')
return type(class_name, (messages.Message,), class_dict)
def define_service(service_descriptor, module):
"""Define a new service proxy.
Args:
service_descriptor: ServiceDescriptor class that describes the service.
module: Module to add service to. Request and response types are found
relative to this module.
Returns:
Service class proxy capable of communicating with a remote server.
"""
class_dict = {'__module__': module.__name__}
class_name = service_descriptor.name.encode('utf-8')
for method_descriptor in service_descriptor.methods or []:
request_definition = messages.find_definition(
method_descriptor.request_type, module)
response_definition = messages.find_definition(
method_descriptor.response_type, module)
method_name = method_descriptor.name.encode('utf-8')
def remote_method(self, request):
"""Actual service method."""
raise NotImplementedError('Method is not implemented')
remote_method.__name__ = method_name
remote_method_decorator = remote.method(request_definition,
response_definition)
class_dict[method_name] = remote_method_decorator(remote_method)
service_class = type(class_name, (remote.Service,), class_dict)
return service_class
def define_file(file_descriptor, module=None):
"""Define module from FileDescriptor.
Args:
file_descriptor: FileDescriptor instance to describe module from.
module: Module to add contained objects to. Module name overrides value
in file_descriptor.package. Definitions are added to existing
module if provided.
Returns:
If no module provided, will create a new module with its name set to the
file descriptor's package. If a module is provided, returns the same
module.
"""
if module is None:
module = new.module(file_descriptor.package)
for enum_descriptor in file_descriptor.enum_types or []:
enum_class = define_enum(enum_descriptor, module.__name__)
setattr(module, enum_descriptor.name, enum_class)
for message_descriptor in file_descriptor.message_types or []:
message_class = define_message(message_descriptor, module.__name__)
setattr(module, message_descriptor.name, message_class)
for service_descriptor in file_descriptor.service_types or []:
service_class = define_service(service_descriptor, module)
setattr(module, service_descriptor.name, service_class)
return module
@util.positional(1)
def import_file(file_descriptor, modules=None):
"""Import FileDescriptor in to module space.
This is like define_file except that a new module and any required parent
modules are created and added to the modules parameter or sys.modules if not
provided.
Args:
file_descriptor: FileDescriptor instance to describe module from.
modules: Dictionary of modules to update. Modules and their parents that
do not exist will be created. If an existing module is found that
matches file_descriptor.package, that module is updated with the
FileDescriptor contents.
Returns:
Module found in modules, else a new module.
"""
if not file_descriptor.package:
raise ValueError('File descriptor must have package name')
if modules is None:
modules = sys.modules
module = _get_or_define_module(file_descriptor.package.encode('utf-8'),
modules)
return define_file(file_descriptor, module)
@util.positional(1)
def import_file_set(file_set, modules=None, _open=open):
"""Import FileSet in to module space.
Args:
file_set: If string, open file and read serialized FileSet. Otherwise,
a FileSet instance to import definitions from.
modules: Dictionary of modules to update. Modules and their parents that
do not exist will be created. If an existing module is found that
matches file_descriptor.package, that module is updated with the
FileDescriptor contents.
_open: Used for dependency injection during tests.
"""
if isinstance(file_set, basestring):
encoded_file = _open(file_set, 'rb')
try:
encoded_file_set = encoded_file.read()
finally:
encoded_file.close()
file_set = protobuf.decode_message(descriptor.FileSet, encoded_file_set)
for file_descriptor in file_set.files:
# Do not reload built in protorpc classes.
if not file_descriptor.package.startswith('protorpc.'):
import_file(file_descriptor, modules=modules)
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