Yesterday I presented Thin at DemoCampCUSEC. Things went pretty well and the other presentations were very good too.
My demo was basically re-coding a simplified version of Thin live, here’s the final result:
%w(rubygems eventmachine thin thin_parser rack).each { |f| require f }
class Connection < EventMachine::Connection
attr_accessor :app
def initialize
@parser = Thin::HttpParser.new
@data = ‘‘
@nparsed = 0
@env = {}
end
def receive_data(data)
@data << data
@nparsed = @parser.execute(@env, @data, @nparsed)
process if @parser.finished?
end
def process
status, headers, body = @app.call(@env)
body_output = ‘‘
body.each { |l| body_output << l }
send_data "HTTP/1.1 #{status} OK\r\n" +
headers.inject(‘‘) { |h, (k,v)| h += "#k: #v\r\n" } +
"\r\n" +
body_output
close_connection_after_writing
end
end
welcome_app = proc do |env|
[
200, # Status
{'Content-Type' => 'text/html'}, # Headers
[
'<html><body>',
'<h1>Welcome</h1>',
'<p>Welcome to my server!</p>', # Body
'<p><a href="/rails">My Rails app!</a></p>',
'</body></html>'
]
]
end
rails_app = Rack::Adapter::Rails.new(:root => ‘/Users/marc/projects/refactormycode‘, :prefix => ‘/rails‘)
app = Rack::URLMap.new(‘/‘ => welcome_app, ‘/rails‘ => rails_app)
EventMachine.run do
EventMachine.start_server ‘0.0.0.0‘, 3000, Connection do |con|
con.app = app
end
end
Hope you enjoyed it!
Zed Shaw, the creator of Mongrel, is writing some pretty 
With all the Ruby frameworks popping up, we’re starting to see some similarities. All of them provide something new or unique but one part of their code is always the same. The part that plugs it into a web server. Ultimately, all web servers have to support all frameworks and vice-versa. That is a lot of duplicated code! That makes me yell, running in circles, waving my arms: not DRY, not DRY, not DRY!
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