sasaki takeru takeru

Rails 2.3.5 on App Engine (TinyDS)

Recently, Takeru Sasaki was able to patch the Rails 2.3.5 calls to rubygems, and now we have it working on App Engine. He also created a datastore adapter called TinyDS. I just created an integration plugin called Rails_TinyDS that provides certain ActiveRecord method calls for Rails 2.3.5 generated scaffold.

See the DataMapper version also: gist.github.com/268192

Install the Development Environment

The gems for the development environment include a pre-release appengine-tools gem that provides a pre-release version of jruby-rack.

sudo gem install google-appengine

If we can create a DeferredDispatcher that is safe and generic, spin-up won’t be a show-stopper, and any app can take advantage of it. Adding this to appengine-rack.rb means people won’t need an additional require, but we will be stuck with it.

I have a sample app here: mwrc-demo.appspot.com

When we have app with multiple map sections (see below) that all call the same dispatcher, will the instance variables still work the way we want?


	rack_opts = {
	:precompilation_enabled => true
	}

	case ENV["DEPLOY_APPID"]
	when "app-production", "app-staging", "app-test01", "app-test02"
	ver = ENV["DEPLOY_VERSION"]
	raise "DEPLOY_VERSION is blank" if ver.nil? \|\| ver.empty?
	rack_opts[:application] = ENV["DEPLOY_APPID"]

	$_rack_request_counter = 0
	$_rack_rails_app = nil
	rails_dispatcher = lambda{\|env\|
	$_rack_request_counter += 1
	if $_rack_request_counter <= 1
	if env["REQUEST_METHOD"]=="GET"
	res = Rack::Response.new("*", 302)
	redir_url = env["REQUEST_URI"] + (env["QUERY_STRING"]=="" ? "?" : "&") + "_spinup_=#{Time.now.to_i}"
	res["Location"] = redir_url
	res.finish

	% ruby rails2_td_appengine.rb
	=> Bundling gems
	Calculating dependencies...
	Updating source: http://gems.rubyforge.org
	Caching: actionmailer-2.3.5.gem
	Caching: actionpack-2.3.5.gem
	Caching: activerecord-2.3.5.gem
	Caching: activeresource-2.3.5.gem
	Caching: activesupport-2.3.5.gem
	Caching: appengine-apis-0.0.13.gem

	#!/usr/bin/ruby
	#
	# Copyright:: Copyright 2009 Google Inc.
	# Original Author:: John Woodell (mailto:woodie@google.com)
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0

	I found this error near "stack level too deep"(=StackOverflowError) error.
	This app is build with JRuby+Rails, almost 99.99% is works fine.
	This error and "stack level too deep" are very rare case.

	public RubyModule popRubyClass() {
	int index = parentIndex;
	RubyModule[] stack = parentStack;
	RubyModule ret = stack[index];
	stack[index] = null;
	parentIndex = index - 1;

	import javax.servlet.http.HttpServletRequest
	import javax.servlet.http.HttpServletResponse
	import javax.servlet.Filter
	import java.util.Date
	import java.util.ArrayList
	import java.net.URL
	import java.net.MalformedURLException
	import java.io.IOException
	import com.google.appengine.api.urlfetch.URLFetchService
	import com.google.appengine.api.urlfetch.FetchOptions

	tkrmb:~/tmp/src_clones/duby% ../jruby/bin/jruby -S rake compile
	(in /Users/takeru/tmp/src_clones/duby)
	mkdir -p build
	Compiling Ruby sources
	Generating Java class DubyCommand to build/org/jruby/duby/DubyCommand.java
	javac -d build -cp /Users/takeru/tmp/src_clones/jruby/lib/jruby-complete.jar:. build/org/jruby/duby/DubyCommand.java
	/Users/takeru/tmp/src_clones/jruby/lib/ruby/site_ruby/shared/jruby/compiler.rb:142 warning: executable? does not in this environment and will return a dummy value
	Compiling Duby sources
	org/jruby/duby/ant/compile.duby:2: cannot load Java class org.jruby.duby.DubyCommand
	import org.jruby.duby.DubyCommand