AssertionError：未找到服务“urlfetch”的 api 代理

Question

我正在使用stripe API 与 Stripe 服务通信。 Google AppEngine 甚至没有在这里导入或参与，但我看到这个奇怪的AssertionError 与 GAE 库相关。下面是堆栈跟踪。可能会出什么问题？

$ python stripe_export.py 
Traceback (most recent call last):
  File "stripe_export.py", line 99, in <module>
    etl_customers()
  File "stripe_export.py", line 72, in etl_customers
    customers = fetch_data(stripe.Customer)
  File "stripe_export.py", line 54, in fetch_data
    _list_obj = cls.all(limit=page_size)
  File "/Library/Python/2.7/site-packages/stripe/resource.py", line 332, in all
    response, api_key = requestor.request('get', url, params)
  File "/Library/Python/2.7/site-packages/stripe/api_requestor.py", line 140, in request
    method.lower(), url, params, headers)
  File "/Library/Python/2.7/site-packages/stripe/api_requestor.py", line 249, in request_raw
    method, abs_url, headers, post_data)
  File "/Library/Python/2.7/site-packages/stripe/http_client.py", line 160, in request
    payload=post_data
  File "/usr/local/google_appengine/google/appengine/api/urlfetch.py", line 268, in fetch
    rpc = create_rpc(deadline=deadline)
  File "/usr/local/google_appengine/google/appengine/api/urlfetch.py", line 224, in create_rpc
    return apiproxy_stub_map.UserRPC('urlfetch', deadline, callback)
  File "/usr/local/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 414, in __init__
    self.__rpc = CreateRPC(service, stubmap)
  File "/usr/local/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 68, in CreateRPC
    assert stub, 'No api proxy found for service "%s"' % service
AssertionError: No api proxy found for service "urlfetch"

Answer 1

这看起来像您运行单元测试并尝试从测试中调用 urlfetch。

我在 win 上做同样的事情，然后我得到以下转储：

File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\urlfetch.py", line 268, in fetch
rpc = create_rpc(deadline=deadline)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\urlfetch.py", line 224, in create_rpc
return apiproxy_stub_map.UserRPC('urlfetch', deadline, callback)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\apiproxy_stub_map.py", line 414, in __init__
self.__rpc = CreateRPC(service, stubmap)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\api\apiproxy_stub_map.py", line 68, in CreateRPC
assert stub, 'No api proxy found for service "%s"' % service
AssertionError: No api proxy found for service "urlfetch"

在 Unix/Win 之间应该没有区别，除了目录名，但在这两种情况下，这都来自 apiproxy_stub_map.py，我假设你是从单元测试中运行它的。

通过我的单元测试为我解决问题的是执行以下操作，也许这也适用于您的问题：

在 TestCase 中包括 testbed 激活、停用和 urlfetch 存根调用，例如：

@classmethod
def setUpClass(cls):
    cls.testbed = testbed.Testbed()
    cls.testbed.activate()
    cls.testbed.init_datastore_v3_stub()
    cls.testbed.init_memcache_stub()
    cls.testbed.init_urlfetch_stub()

@classmethod
def tearDownClass(cls):
    cls.testbed.deactivate()

调用cls.testbed.init_urlfetch_stub() 可以让我激活 urlfetch 服务。

文档中列出了您必须调用才能使用单元测试的不同服务的所有存根：https://cloud.google.com/appengine/docs/python/tools/localunittesting

Answer 2

Per this Google Groups thread:

from google.appengine.api import urlfetch_stub
from google.appengine.api import apiproxy_stub_map 
apiproxy_stub_map.apiproxy = apiproxy_stub_map.APIProxyStubMap() 
apiproxy_stub_map.apiproxy.RegisterStub('urlfetch', 
urlfetch_stub.URLFetchServiceStub())