Please help me to understand Nick's blog.
http://blog.notdot.net/2010/02/Webapps-on-App-Engine-part-6-Lazy-loading
If I tried "Import framework" I got "framework not found". I assume
he wants us to substitute the name of my framework, which is webapp??
I created a file lazytest.py, with the following:
from google.appengine.ext import webapp
class TestHome(webapp.RequestHandler):
def get(self):
self.response.out.write('<h1>Hello Lazy World</h1>')
testHomeHandler = TestHome()
If I do this:
application = webapp.WSGIRouter()
application.connect('/',
framework.WSGILazyLoader('LazyTest.testHomeHandler'))
def main():
run_wsgi_app(application)
then I get this error:
application = webapp.WSGIRouter()
AttributeError: 'module' object has no attribute 'WSGIRouter'
So I tried more of what I had before, but with the insertion of the
LazyLoader class:
class WSGILazyLoader(object):
def __init__(self, fullname):
self.modulename, self.objname = fullname.rpartition('.')
self.obj = None
def __call__(self, environ, start_response):
if not self.obj:
__import__(self.modulename, globals(), locals())
module = sys.modules[self.modulename]
self.obj = module.__dict__[self.objname]
return self.obj(environ, start_response)
def main():
# i have temporarily removed 300 of my pages until I get these
simple ones to work
application = webapp.WSGIApplication([
('/',
WSGILazyLoader('LazyTest.testHomeHandler')),
("/reportTaskLogs", ReportTaskLogs),
("/getImage", GetImage),
("/getText", GetText),
],
debug=True)
run_wsgi_app(application)
then I get this error:
File "c:\GoogleAppEngine\olexe3\main.py", line 449, in main
application = webapp.WSGIApplication([ ('/',
WSGILazyLoader('LazyTest.testHomeHandler')),
File "c:\GoogleAppEngine\olexe3\main.py", line 389, in __init__
self.modulename, self.objname = fullname.rpartition('.')
ValueError: too many values to unpack
I went off to research "rpartition", and seems like maybe Nick had a
bug??? Surely, not Nick.
So I tried this, as the separator itself is returned in the
rpartition...
class WSGILazyLoader(object):
def __init__(self, fullname):
self.modulename, sep, self.objname = fullname.rpartition('.')
self.obj = None
Now I'm getting this:
File "c:\GoogleAppEngine\olexe3\main.py", line 451, in main
run_wsgi_app(application)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine
\ext\webapp\util.py", line 97, in run_wsgi_app
run_bare_wsgi_app(add_wsgi_middleware(application))
File "C:\Program Files (x86)\Google\google_appengine\google\appengine
\ext\webapp\util.py", line 115, in run_bare_wsgi_app
result = application(env, _start_response)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine
\ext\webapp\__init__.py", line 500, in __call__
handler = handler_class()
TypeError: __call__() takes exactly 3 arguments (1 given)
So now I'm totally lost. Any help appreciated, or if anyone has a
sample app that works in this manner.
Neal
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