Question

我正在尝试使用线程安全模式和GAE 1.6.0预发布SDK中的新Python 2.7运行时使用Jinja2运行Pyramid。我按照here概述对我的应用进行了修改，即我在runtime: python27中设置了threadsafe: true，app.yaml并删除了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__'

我试图用pyramid_jinja2代码搞砸一下来解决这个问题，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些什么，我会很高兴。从后一个堆栈跟踪判断，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造成的。

感谢您对此问题的任何见解。

Answer 1

我不熟悉金字塔，但问题似乎确实存在于这一行：

config.include('pyramid_jinja2')

无论config是什么，它似乎都在做一些动态导入魔术。

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，您很快就会看到它，只实现了真正的python所做的一小部分。

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

Answer 2

我设法使用Pyramid 1.3的AssetResolver使其工作。首次尝试是here。在这种情况下，我不确定旋转变压器的寿命/范围应该是什么，我稍后会详细说明。

Answer 3

在pyramid_jinja2 / __ init__.py中，在_get_or_build_default_environment（）之前添加以下代码

class VirtualModule(object):
   def __init__(self,name):
      import sys
      sys.modules[name]=self
   def __getattr__(self,name):
      return globals()[name]
VirtualModule("__main__")

def _get_or_build_default_environment(registry):

（http://www.inductiveautomation.com/forum/viewtopic.php?f=70&p=36917）

金字塔+ jinja2和新的GAE运行时

3 个答案: