Question

我正在尝试使用ProtoRPC的memcache来加速某些过程（使用Python的Google App Engine）。为了简化问题，我使用了Hello World示例，并对其进行了一些修改。这是我的版本：

from protorpc import messages
from protorpc import remote
from protorpc.wsgi import service

from google.appengine.api import memcache

class HelloRequest(messages.Message):
  my_name = messages.StringField(1, required=True)

class ElementOfArrayResponse(messages.Message):
  value=messages.IntegerField(1)

class HelloResponse(messages.Message):
  hello = messages.StringField(1, required=True)
  list = messages.MessageField(ElementOfArrayResponse, 2, repeated=True)

class HelloService(remote.Service):
  @remote.method(HelloRequest, HelloResponse)
  def hello(self, request):
    response = memcache.get(request.my_name)

    if response is None:
      list = []
      for i in range(7):
        list.append(SomeElementResponse(value=i))
      response = HelloResponse(hello='Hello there, %s!' % request.my_name, list=list)
      memcache.set(request.my_name,response)
    return response

app = service.service_mappings([('/hello.*', HelloService)])

但遗憾的是，此代码返回的错误是：ERROR 2013-01-12 17:17:31,081 service.py:196] Encountered unexpected error from ProtoRPC method implementation: PicklingError (Can't pickle <type 'weakref'>: attribute lookup __builtin__.weakref failed)。

然而，当我使用与原始HelloResponse几乎相同的代码时，memcache工作得很好。

那么，我做错了什么？

Answer 1

两件事，看起来你的memcache键是一个List对象（想要确保你知道这一点）。在您的代码旁边，您必须在放置/退出message api时序列化memcache对象。

这是重写：

from protorpc import remote
from protorpc import messages
from protorpc import protojson
from protorpc.wsgi import service
from google.appengine.api import memcache


class HelloRequest(messages.Message):
  my_name = messages.StringField(1, required=True)

class ElementOfArrayResponse(messages.Message):
  value=messages.IntegerField(1)

class HelloResponse(messages.Message):
  hello = messages.StringField(1, required=True)
  list = messages.MessageField(ElementOfArrayResponse, 2, repeated=True)

class HelloService(remote.Service):
  @remote.method(HelloRequest, HelloResponse)
  def hello(self, request):
    response = memcache.get(request.my_name)
    if response:
      # decode the value to a message..
      response = protojson.decode_message(HelloResponse, response)
    else:
      list = []
      for i in range(7):
        list.append(SomeElementResponse(value=i))
      response = HelloResponse(hello='Hello there, %s!' % request.my_name, list=list)
      # encode the message to a serializable format..
      value = protojson.encode_message(message)
      memcache.set(request.my_name, value)
    return response

app = service.service_mappings([('/hello.*', HelloService)])

如何在ProtoRPC中使用Memcache（Google App Engine - Python）

1 个答案: