On 2/22/06, Todd Thomas <caliban19@gmail.com > wrote:


On 2/22/06, Matt Helm < code.name.eric@gmail.com> wrote:
On 2/21/06, Graeme Glass wrote:
> Would you mind posting some sample code, for refrence?
> Many thanks.

class Resource(resource.Resource):

   def render(self, request):

       def cheeto(r):
           request.write(r.__str__())
           request.finish()

       def cherr(r):
           request.write("Bang!")
           request.write(str(r))
           request.finish()

       d_cheeto = threads.deferToThread(Template, file="alf.tmpl", searchList =
slist)
       d_cheeto.addCallback(cheeto)
       d_cheeto.addErrback(cherr)

       return server.NOT_DONE_YET

resource = Resource()

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webexp.py
--------------------------------------------
from twisted.application import internet, service
from twisted.web import static, server, script
import CheetahMapper

root = static.File("./")
root.indexNames=['index.cht']
root.ignoreExt(".cht")
root.processors = {'.cht': CheetahMapper.CheetahResource}
application = service.Application('web')
sc = service.IServiceCollection(application)
site = server.Site(root)
i = internet.TCPServer(8888, site)
i.setServiceParent(sc)

CheetahMapper.py
------------------------------------------------
from twisted.web import resource, server
from Cheetah.Template import Template


 class CheetahResource(resource.Resource):
    isLeaf = 1

    def __init__(self, filename, registry):
        self.filename = filename
        self.registry = registry

    def render(self, request):
        tmplt = Template.compile(file=self.filename)
        inst=tmplt()
        request.write(str(inst))
        request.finish()
        return server.NOT_DONE_YET

 time.cht
------------------------------------------------------
#import time
<html>
<head>
<title>Time Example</title>
</head>
<body>
It is $time.strftime("%I:%M %p").
<br>
Date is $time.strftime("%A, %B %D, %Y").
</body>
</html>
-----------------------------------------------------------------------
Not the best code in the world, but it has been useful for me for just throwing together quick pages and experimenting.

ToddB
There is a catch22 with cheetah and twisted that just annoys me. Cheetah has an excellent caching mechanism built in, which would be awesome to use for deferreds which access databases. If you basically use Cheetah via namespace there is no way to use this caching. You could wrap cheetah class in a deferred, then call deferred from within the template but this seems like overkill, wish there was a way to see if result is cached then call deferred if needed, so far I haven't found an obvious way for this to work.

ToddB