On Tue, 17 Apr 2007 09:57:24 -0500, Jonathan Vanasco
<[EMAIL PROTECTED]> wrote:
I asked this on the -python list, some suggested I re-ask here.
I'm trying to build a small daemon that does the following:
1_ parse the uri for the key to an image
2_ validate that key against db
3_ if not valid, render a 404
4_ if valid, map to an arbitrary file on the fs ( pulled from
db )
4b_ or check a bdb to see if its on the fs, pull a copy off of
amazon's s3 otherwise and update the cachedb to note we have it
The issue that I'm having:
i originally tried doing this based on one of the chapters in the
twisted o'reilley book. i ran into issues when I tried to render an
image -- i couldn't figure out how to do that.
somone on twisted web suggested i not use the protocol and instead use
site (http://twistedmatrix.com/projects/web/documentation/howto/
using-twistedweb.html#auto2 ). i ran into issues when trying to render
status codes and add in proxy functionality.
I'm at a loss on what I should be using. can someone offer advice ?
You are attacking this at too low a level, I think. In essence you are
building a fixed-function web server, which is a waste of your time and
resources, because twisted already has a decent web server implementation.
Just make a .tac file for starters, something along these lines:
--------------webserver.tac-------------------------------------
# UNTESTED CODE I PULLED OUT OF MY EAR!
from twisted.application import internet, service
from twisted.python import log
from twisted.web2 import channel, http
from twisted.web2 import resource, responsecode, server
class Image(resource.LeafResource):
def __init__(self, key):
self.key = key
def render(self, request)
# Locate the image, return some kind
# of http.Response, or a defer.Deferred
class Root(resource.Resource):
addSlash = True
def childFactory(self, request, name):
return Image(name)
def render(self, request):
return http.Response(
code=responsecode.OK,
headers={},
stream='Blah'
)
root = Root()
site = server.Site(root)
port = 8080
application = service.Application('ImageServer')
svc = internet.TCPServer(port, channel.HTTPFactory(site))
svc.setServiceParent(application)
---------------------------------------------------------------
Run the above with twistd -noy webserver.tac. This should be
sufficient to get you started.
Hope this helps,
L. Daniel Burr
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