quick_vhosting_hack.md

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default	quick vhosting hack

quick vhosting hack

Here is a 10 minute hack with lots of room for improvement but I think its pretty useful. I made this to allow the serving of multiple sites from a single webpy app.

I created this because I would like to run a few small sites but my cheap account at my hosting provider:

• Only allows 40MB to be used by persistent processes.
• Only allows one persistent process.
• Multiple instances of webpy would require multiple ports to be proxied with apache's mod_proxy and this configuration can only be done by the server admin.

So, I just made a quick decorator for web.handler.

###Stuff to Note:

This expects to be working behind a proxy but that can easily be corrected.

More work could be done on web.render and the page class names so the code you create for sites in this setup can be more easily made into standalone sites later on.

The /static directory is currently still shared between all sites.

###The Code

 #
 ## URL MAPPING
 #
 urls_1 = (
     '/','index_1',
 )
 
 urls_2 =(
     '/','index_2',
 )
 
 urls_3=(
     '/','index_3',
 )

 #vhost mapping: {domain:url_mapping}

 vhosts={'test.org':urls_1,
         'www.test.org':urls_2,
         'another-url.org':urls_3
         }

 #
 ## VHOSTING DECORATOR
 #
 def vhostrr(vhosts=vhosts):
     def decorator(func): 
         def proxyfunc(*args, **kw):
             if 'HTTP_X_FORWARDED_HOST' in web.ctx.environ:
                 rd=web.ctx.environ['HTTP_X_FORWARDED_HOST']
                 mapping=None
                 for d in vhosts.keys():
                     if d==rd:
                         mapping=vhosts[d]
                 if mapping==None:
                     print 'Error, Not configured for vhost: '+rd
                     return
             else:
                 print 'Direct access not allowed. Use proxy.'
                 return
             return func(mapping=mapping, *args, **kw)
         return proxyfunc
     return decorator
      
 ########################################################################
 # Site 1:
 ########################################################################
 class index_1:
     def GET(self):
         web.render('../templates_1/main.html')
 
 ########################################################################
 # Site 2:
 ########################################################################
 class index_2:
     def GET(self):
         web.render('../templates_2/main.html')
 
 ########################################################################
 # Site 3:
 ########################################################################
 class index_3:
     def GET(self):
         web.render('../templates_3/main.html')

 #
 ## RUN APPLICATION
 #
 
 if __name__ == "__main__":
 
     import sys
     sys.argv.append('2345') #Set the port I want. A better way to do this?
     
     #instead of:
     #web.run(urls, web.reloader, session_mw)
     
     #apply the vhostrr "decorator" remotely
     web.run(vhostrr()(web.handle), web.reloader)