金字塔+ jinja2和新的GAE运行时

Question

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.我做了修改,以我的应用程序所概括这里,也就是我给自己定runtime: python27,threadsafe: true在app.yaml与排除main()功能.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 <module>
    config.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", line 168, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  [...]
  File "/myapp/source/myapp-tip/main.py", line 29, in <module>
    config.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 640, in Decorate
    return func(self, *args, **kwargs)
  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 640, in Decorate
    return func(self, *args, **kwargs)
  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,似乎它正试图解决资产问题,但为什么要重新加载__main__呢？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.

Answer 1

我不熟悉金字塔，但问题似乎确实出在这一行：

config.include('pyramid_jinja2')

不管那config东西是什么，它似乎正在发挥一些动态导入的魔力。

不要那样做。

App Engine 环境不会像普通 Python 中那样处理导入。使用调试器单步执行该行，您将得到导入系统的替换版本，您很快就会看到，它只实现了真正的 python 功能的一小部分。

如果可能的话，只需使用普通的导入语句...否则，您将不得不深入研究config.include并让它与 GAE 上的受限导入功能很好地配合。