Rails - Dec 2007 - GWT hosted mode (debug) and rails

Hi all,

First of all sorry about the double posting I thought it might be  
useful for both lists.

We''ve have a project that''s moving on quite quickly now using
GWT for
display and Rails for the backend. Our application uses JSON for  
communication, it works very well. The only problem we''ve had is debug
in hosted mode. Below is a solution that works for us, I hope that  
other people might find it useful.

WARNING: before you run your application in debug, ensure that you  
DON''T have the compile module in your public directory...
we remove it with a rake task just before we start up the hosted mode.  
Forget and it will run, but debug ing will not work.

1. Add the following to your config/routes.rb

# repeat this for each GWT module
map.connect "my.gwt.test/*path", :controller =>
"gwt_proxy", :action
=> "proxy"


2. create a controller called gwt_proxy and add the following code to it

#          !!!!!! BIG FAT WARNING !!!!!!!
#
#       The below code works but isn''t nice.
#

require ''net/http''
class GwtProxyController < ApplicationController

   # turn off the proxy
   session :off

   # done authenticate the proxy requests
   skip_before_filter :check_authentication

   # protect ourselfs from the loop that normal browswer get into
   before_filter :reject_compile_js_requests

   # URL of gwt''s in built tomcat server
   GWT_SERVER = "http://localhost:8888"

   # warning not a hosted mode broswer
   NONE_HOSTED_MODE = "== WARNING PROXY REQUEST NOT HANDLED, YOU MUST  
NOT USE A NORMAL BROSWER=="

   # GWT tomcat server not responding
   PROXY_NOT_UP = "== GWT Server is not running at #{GWT_SERVER} =="

   # this filter stops the recusive look that normal - no hosted mode  
broswers get them selfs into.
   def reject_compile_js_requests
     if request.query_string.ends_with?("compiled")
       puts NONE_HOSTED_MODE

       render :text => NONE_HOSTED_MODE,:status => 500
       return false
     end
   end

   # Proxy a request to gwt''s in built tomact server
   # TODO: we should really proxy status codes and headers....
   def proxy
     begin
       req =  
Net::HTTP.get_response(URI.parse("#{GWT_SERVER}/"+request.path))
       text = req.body
       render :text => text
     rescue
       puts PROXY_NOT_UP
       render :text => PROXY_NOT_UP, :status => 500
     end
   end
end



3. Start up your the gwt hosted mode browser with something like this,  
notice the url at the end and the debug information.

java -XstartOnFirstThread -Xmx512M -Xdebug  - 
Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=1035 \
  -Dfile.encoding=MacRoman -classpath <enter your classpath>   
com.google.gwt.dev.GWTShell \
  -style OBFUSCATED -logLevel DEBUG  -whitelist  ^http.* \
  http://localhost:3000/my.gwt.test/test.html


4. Start up your IDE and tell it to debug on the port shown in the  
command above (1035)


5. Enjoy debugging


David


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