[Zope] Experiment: Pyjamas with Zope

[Tres Seaver]

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Jim Washington wrote:
> So, I have a need to put together a more elaborate web page.  Lots of 
> pop-up dialog boxes and dynamically-updated choice lists.  How to do that?
> 
> I take a look at Pyjamas http://pyjs.org. Pretty cool.
> 
> Here's the theory.  Write fancy application web page in python using the 
> Pyjamas/GWT API, then "compile" it to javascript.  Serve it through 
> zope, which will handle auth/auth.  Client-server communication flows 
> through json-rpc calls.  What could possibly go wrong?
> 
> First-off, just a simple test-of-concept.  Edit the JSONRPCExample.py 
> file in the examples/jsonrpc folder that came with pyjamas.
> 
> I'll locate the jsonrpc service in zope's containment root, so I change 
> the uri in EchoServicePython from "/services/EchoService.py" to "/". 
> That's all I need to change.  Compile it using the handy "build.sh" 
> that's in the same folder.  Look in the "output" folder and see what we got.
> 
> Wow. a bunch of files.
> 
> JSONRPCExample.IE6.cache.html
> Mozilla.cache.html
> OldMoz.cache.html
> Opera.cache.html
> Safari.cache.html
> JSONRPCExample.html
> JSONRPCExample.nocache.html
> corner_dialog_bottomleft.png
> corner_dialog_bottomleft_black.png
> corner_dialog_bottomright.png
> corner_dialog_bottomright_black.png
> corner_dialog_edge.png
> corner_dialog_edge_black.png
> corner_dialog_topleft.png
> corner_dialog_topleft_black.png
> corner_dialog_topright.png
> corner_dialog_topright_black.png
> history.html
> pygwt.js
> tree_closed.gif
> tree_open.gif
> tree_white.gif
> 
> I'm lazy, so instead of doing a bunch of resource or view directives in 
> ZCML, I let my paste.ini do the handling.
> 
> [app:pyjs1]
> use=egg:Paste#static
> document_root=/home/jwashin/projects/pyjamas/pyjamas-0.4/examples/jsonrpc/output
> 
> then, I link that in with the composite app.
> 
> [composite:Paste.Main]
> use = egg:Paste#urlmap
> / = zope
> /images = images
> /pyjs1 = pyjs1
> 
> Now, to get to JSONRPCExample.html, I need to go to 
> http://website/pyjs1/JSONRPCExample.html
> 
> But first, I need to actually handle the json-rpc requests in zope.
> 
> Make a servicetest.py.  Almost exactly similar to EchoService.py in the 
> output/services folder.
> 
> from zif.jsonserver.jsonrpc import MethodPublisher
> class Services(MethodPublisher):
>      def echo(self, msg):
>          return msg
>      def reverse(self, msg):
>          return msg[::-1]
>      def uppercase(self, msg):
>          return msg.upper()
>      def lowercase(self, msg):
>          return msg.lower()
> 
> Now, a ZCML incantation.
> 
> <jsonrpc:view
>      for="zope.app.folder.interfaces.IRootFolder"
>      permission="zope.Public"
>      methods="echo reverse uppercase lowercase"
>      class = ".servicetest.Services"
>      />
> 
> Start zope, and go to http://website/pyjs1/JSONRPCExample.html
> 
> Nice page.  Click the "Send to Python Service" button.
> 
> Server Error or Invalid Response: ERROR 0 - Server Error or Invalid Response
> 
> Damn.
> 
> Pull up tcpwatch and see what we are getting.  Aha.  pyjamas app is 
> sending jsonrpc with a content-type of 
> application/x-www-form-urlencoded, so zope is not handing it off to 
> zif.jsonserver for handling.
> 
> Fix pyjamas or let zif.jsonserver handle this content-type?
> 
> In zif.jsonserver's configure.zcml, in the "publisher" directive, add 
> application/x-www-form-urlencoded to mimetypes.
> 
> Restart zope. Go to http://website/pyjs1/JSONRPCExample.html
> 
> It works.
> 
> Change permissions in the jsonrpc:view directive.  Restart zope.
> 
> Go to the page.  Page loads.  Push the button, and I get a Basic HTTP 
> Authentication dialog.  Nice.
> 
> Overall Results:  So far, so good. :)

Thanks for the tour.  I've been meaning to look at Pyjamas.


Tres.
- --
===================================================================
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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