python – 金字塔jinja2和新的GAE运行时

我试图在线程安全模式和GAE 1.6.0预发布SDK中使用新的Python 2.7运行时使用Jinja2运行Pyramid.我按照概述here对我的应用程序进行了修改,即我在app.yaml中设置了运行时：python27,threadsafe：true并且摆脱了main()函数.当我自己生成响应时,它工作正常,但是当我尝试将jinja2引入等式时,我得到以下异常：

ERROR    2011-11-07 00:10:34,356 wsgi.py:170] 
Traceback (most recent call last):
  File "/gae/google/appengine/runtime/wsgi.py",line 168,in Handle
  [...]
  File "/myapp/source/myapp-tip/main.py",line 29,in fig.include('pyramid_jinja2')
  File "/myapp/source/myapp-tip/lib/dist/pyramid/config/__init__.py",line 616,in include
    c(configurator)
  File "lib/dist/pyramid_jinja2/__init__.py",line 390,in includeme
    _get_or_build_default_environment(config.registry)
  File "/lib/dist/pyramid_jinja2/__init__.py",line 217,in _get_or_build_default_environment
    _setup_environment(registry)
  File "/lib/dist/pyramid_jinja2/__init__.py",line 253,in _setup_environment
    package = _caller_package(('pyramid_jinja2','jinja2','pyramid.config'))
  File "/lib/dist/pyramid_jinja2/__init__.py",line 136,in caller_package
    for t in self.inspect.stack():
  File "/usr/lib/python2.7/inspect.py",line 1056,in stack
    return getouterframes(sys._getframe(1),context)
  File "/usr/lib/python2.7/inspect.py",line 1034,in getouterframes
    framelist.append((frame,) + getframeinfo(frame,context))
  File "/usr/lib/python2.7/inspect.py",line 1009,in getframeinfo
    lines,lnum = findsource(frame)
  File "/usr/lib/python2.7/inspect.py",line 534,in findsource
    module = getmodule(object,file)
  File "/usr/lib/python2.7/inspect.py",line 506,in getmodule
    main = sys.modules['__main__']
KeyError: '__main__'

我尝试使用pyramid_jinja2代码来解决这个问题,但只留下另一个例外：

ERROR    2011-11-04 12:06:38,720 wsgi.py:170] 
Traceback (most recent call last):
  File "/gae/google/appengine/runtime/wsgi.py",in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  [...]
  File "/myapp/source/myapp-tip/main.py",in fig.add_jinja2_search_path("templates")
  File "/myapp/source/myapp-tip/lib/dist/pyramid/config/util.py",line 28,in wrapper
    result = wrapped(self,*arg,**kw)
  File "/lib/dist/pyramid_jinja2/__init__.py",line 311,in add_jinja2_search_path
    env.loader.searchpath.append(abspath_from_resource_spec(d))
  File "/myapp/source/myapp-tip/lib/dist/pyramid/asset.py",line 38,in abspath_from_asset_spec
    return pkg_resources.resource_filename(pname,filename)
  File "/myapp/source/myapp-tip/pkg_resources.py",line 840,in resource_filename
    return get_provider(package_or_requirement).get_resource_filename(
  File "/myapp/source/myapp-tip/pkg_resources.py",line 160,in get_provider
    __import__(moduleOrReq)
  File "/gae/google/appengine/tools/dev_appserver_import_hook.py",line 640,in Decorate
    return func(self,*args,**kwargs)
  File "/gae/google/appengine/tools/dev_appserver_import_hook.py",line 1756,in load_module
    return self.FindAndLoadModule(submodule,fullname,search_path)
  File "/gae/google/appengine/tools/dev_appserver_import_hook.py",line 1628,in FindAndLoadModule
    description)
  File "/gae/google/appengine/tools/dev_appserver_import_hook.py",line 1571,in LoadModuleRestricted
    description)
ImportError: Cannot re-init internal module __main__

如果有人能够了解金字塔在引擎盖下试图做什么,我会很高兴.从后面的堆栈跟踪来看,它似乎正在尝试解析资产,但为什么它会尝试重新加载__main__？我甚至不确定我的问题是由金字塔还是GAE引起的.

感谢您对此问题的任何见解.

最佳答案

我不熟悉金字塔,但问题确实似乎与这一行有关：

config.include('pyramid_jinja2')

无论配置是什么,它似乎都在做一些动态的导入魔术.

不要那样做.

应用引擎环境不像普通python那样处理导入.使用调试器逐步执行该行,您将最终看到导入系统的替换版本,您很快就会看到,只实现了真正的python所做的一小部分.

如果可能的话,只需使用正常的import语句……否则,你将不得不深入研究config.include并使其与GAE上受限制的导入功能配合使用.