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Diffstat (limited to 'generator/google/protobuf/service_reflection.py')
| -rw-r--r-- | generator/google/protobuf/service_reflection.py | 284 |
1 files changed, 0 insertions, 284 deletions
diff --git a/generator/google/protobuf/service_reflection.py b/generator/google/protobuf/service_reflection.py deleted file mode 100644 index 1c3636a..0000000 --- a/generator/google/protobuf/service_reflection.py +++ /dev/null @@ -1,284 +0,0 @@ -# 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. - -"""Contains metaclasses used to create protocol service and service stub -classes from ServiceDescriptor objects at runtime. - -The GeneratedServiceType and GeneratedServiceStubType metaclasses are used to -inject all useful functionality into the classes output by the protocol -compiler at compile-time. -""" - -__author__ = 'petar@google.com (Petar Petrov)' - - -class GeneratedServiceType(type): - - """Metaclass for service classes created at runtime from ServiceDescriptors. - - Implementations for all methods described in the Service class are added here - by this class. We also create properties to allow getting/setting all fields - in the protocol message. - - The protocol compiler currently uses this metaclass to create protocol service - classes at runtime. Clients can also manually create their own classes at - runtime, as in this example: - - mydescriptor = ServiceDescriptor(.....) - class MyProtoService(service.Service): - __metaclass__ = GeneratedServiceType - DESCRIPTOR = mydescriptor - myservice_instance = MyProtoService() - ... - """ - - _DESCRIPTOR_KEY = 'DESCRIPTOR' - - def __init__(cls, name, bases, dictionary): - """Creates a message service class. - - Args: - name: Name of the class (ignored, but required by the metaclass - protocol). - bases: Base classes of the class being constructed. - dictionary: The class dictionary of the class being constructed. - dictionary[_DESCRIPTOR_KEY] must contain a ServiceDescriptor object - describing this protocol service type. - """ - # Don't do anything if this class doesn't have a descriptor. This happens - # when a service class is subclassed. - if GeneratedServiceType._DESCRIPTOR_KEY not in dictionary: - return - descriptor = dictionary[GeneratedServiceType._DESCRIPTOR_KEY] - service_builder = _ServiceBuilder(descriptor) - service_builder.BuildService(cls) - - -class GeneratedServiceStubType(GeneratedServiceType): - - """Metaclass for service stubs created at runtime from ServiceDescriptors. - - This class has similar responsibilities as GeneratedServiceType, except that - it creates the service stub classes. - """ - - _DESCRIPTOR_KEY = 'DESCRIPTOR' - - def __init__(cls, name, bases, dictionary): - """Creates a message service stub class. - - Args: - name: Name of the class (ignored, here). - bases: Base classes of the class being constructed. - dictionary: The class dictionary of the class being constructed. - dictionary[_DESCRIPTOR_KEY] must contain a ServiceDescriptor object - describing this protocol service type. - """ - super(GeneratedServiceStubType, cls).__init__(name, bases, dictionary) - # Don't do anything if this class doesn't have a descriptor. This happens - # when a service stub is subclassed. - if GeneratedServiceStubType._DESCRIPTOR_KEY not in dictionary: - return - descriptor = dictionary[GeneratedServiceStubType._DESCRIPTOR_KEY] - service_stub_builder = _ServiceStubBuilder(descriptor) - service_stub_builder.BuildServiceStub(cls) - - -class _ServiceBuilder(object): - - """This class constructs a protocol service class using a service descriptor. - - Given a service descriptor, this class constructs a class that represents - the specified service descriptor. One service builder instance constructs - exactly one service class. That means all instances of that class share the - same builder. - """ - - def __init__(self, service_descriptor): - """Initializes an instance of the service class builder. - - Args: - service_descriptor: ServiceDescriptor to use when constructing the - service class. - """ - self.descriptor = service_descriptor - - def BuildService(self, cls): - """Constructs the service class. - - Args: - cls: The class that will be constructed. - """ - - # CallMethod needs to operate with an instance of the Service class. This - # internal wrapper function exists only to be able to pass the service - # instance to the method that does the real CallMethod work. - def _WrapCallMethod(srvc, method_descriptor, - rpc_controller, request, callback): - return self._CallMethod(srvc, method_descriptor, - rpc_controller, request, callback) - self.cls = cls - cls.CallMethod = _WrapCallMethod - cls.GetDescriptor = staticmethod(lambda: self.descriptor) - cls.GetDescriptor.__doc__ = "Returns the service descriptor." - cls.GetRequestClass = self._GetRequestClass - cls.GetResponseClass = self._GetResponseClass - for method in self.descriptor.methods: - setattr(cls, method.name, self._GenerateNonImplementedMethod(method)) - - def _CallMethod(self, srvc, method_descriptor, - rpc_controller, request, callback): - """Calls the method described by a given method descriptor. - - Args: - srvc: Instance of the service for which this method is called. - method_descriptor: Descriptor that represent the method to call. - rpc_controller: RPC controller to use for this method's execution. - request: Request protocol message. - callback: A callback to invoke after the method has completed. - """ - if method_descriptor.containing_service != self.descriptor: - raise RuntimeError( - 'CallMethod() given method descriptor for wrong service type.') - method = getattr(srvc, method_descriptor.name) - return method(rpc_controller, request, callback) - - def _GetRequestClass(self, method_descriptor): - """Returns the class of the request protocol message. - - Args: - method_descriptor: Descriptor of the method for which to return the - request protocol message class. - - Returns: - A class that represents the input protocol message of the specified - method. - """ - if method_descriptor.containing_service != self.descriptor: - raise RuntimeError( - 'GetRequestClass() given method descriptor for wrong service type.') - return method_descriptor.input_type._concrete_class - - def _GetResponseClass(self, method_descriptor): - """Returns the class of the response protocol message. - - Args: - method_descriptor: Descriptor of the method for which to return the - response protocol message class. - - Returns: - A class that represents the output protocol message of the specified - method. - """ - if method_descriptor.containing_service != self.descriptor: - raise RuntimeError( - 'GetResponseClass() given method descriptor for wrong service type.') - return method_descriptor.output_type._concrete_class - - def _GenerateNonImplementedMethod(self, method): - """Generates and returns a method that can be set for a service methods. - - Args: - method: Descriptor of the service method for which a method is to be - generated. - - Returns: - A method that can be added to the service class. - """ - return lambda inst, rpc_controller, request, callback: ( - self._NonImplementedMethod(method.name, rpc_controller, callback)) - - def _NonImplementedMethod(self, method_name, rpc_controller, callback): - """The body of all methods in the generated service class. - - Args: - method_name: Name of the method being executed. - rpc_controller: RPC controller used to execute this method. - callback: A callback which will be invoked when the method finishes. - """ - rpc_controller.SetFailed('Method %s not implemented.' % method_name) - callback(None) - - -class _ServiceStubBuilder(object): - - """Constructs a protocol service stub class using a service descriptor. - - Given a service descriptor, this class constructs a suitable stub class. - A stub is just a type-safe wrapper around an RpcChannel which emulates a - local implementation of the service. - - One service stub builder instance constructs exactly one class. It means all - instances of that class share the same service stub builder. - """ - - def __init__(self, service_descriptor): - """Initializes an instance of the service stub class builder. - - Args: - service_descriptor: ServiceDescriptor to use when constructing the - stub class. - """ - self.descriptor = service_descriptor - - def BuildServiceStub(self, cls): - """Constructs the stub class. - - Args: - cls: The class that will be constructed. - """ - - def _ServiceStubInit(stub, rpc_channel): - stub.rpc_channel = rpc_channel - self.cls = cls - cls.__init__ = _ServiceStubInit - for method in self.descriptor.methods: - setattr(cls, method.name, self._GenerateStubMethod(method)) - - def _GenerateStubMethod(self, method): - return (lambda inst, rpc_controller, request, callback=None: - self._StubMethod(inst, method, rpc_controller, request, callback)) - - def _StubMethod(self, stub, method_descriptor, - rpc_controller, request, callback): - """The body of all service methods in the generated stub class. - - Args: - stub: Stub instance. - method_descriptor: Descriptor of the invoked method. - rpc_controller: Rpc controller to execute the method. - request: Request protocol message. - callback: A callback to execute when the method finishes. - Returns: - Response message (in case of blocking call). - """ - return stub.rpc_channel.CallMethod( - method_descriptor, rpc_controller, request, - method_descriptor.output_type._concrete_class, callback) |