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#--
# Copyright (c) 2004 David Heinemeier Hansson
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++
# This class provides an interface for dispatching a CGI (or CGI-like) request
# to the appropriate controller and action. It also takes care of resetting
# the environment (when Dependencies.load? is true) after each request.
class Dispatcher
class << self
# Dispatch the given CGI request, using the given session options, and
# emitting the output via the given output. If you dispatch with your
# own CGI object be sure to handle the exceptions it raises on multipart
# requests (EOFError and ArgumentError).
def dispatch(cgi = nil, session_options = ActionController::CgiRequest::DEFAULT_SESSION_OPTIONS, output = $stdout)
if cgi ||= new_cgi(output)
request, response = ActionController::CgiRequest.new(cgi, session_options), ActionController::CgiResponse.new(cgi)
prepare_application
ActionController::Routing::Routes.recognize!(request).process(request, response).out(output)
end
rescue Object => exception
failsafe_response(output, '500 Internal Server Error') do
ActionController::Base.process_with_exception(request, response, exception).out(output)
end
ensure
# Do not give a failsafe response here.
reset_after_dispatch
end
# Reset the application by clearing out loaded controllers, views, actions,
# mailers, and so forth. This allows them to be loaded again without having
# to restart the server (WEBrick, FastCGI, etc.).
def reset_application!
Controllers.clear!
Dependencies.clear
ActiveRecord::Base.reset_subclasses
Dependencies.remove_subclasses_for(ActiveRecord::Base, ActiveRecord::Observer, ActionController::Base)
Dependencies.remove_subclasses_for(ActionMailer::Base) if defined?(ActionMailer::Base)
end
private
# CGI.new plus exception handling. CGI#read_multipart raises EOFError
# if body.empty? or body.size != Content-Length and raises ArgumentError
# if Content-Length is non-integer.
def new_cgi(output)
failsafe_response(output, '400 Bad Request') { CGI.new }
end
def prepare_application
ActionController::Routing::Routes.reload if Dependencies.load?
prepare_breakpoint
Controllers.const_load!(:ApplicationController, "application") unless Controllers.const_defined?(:ApplicationController)
end
def reset_after_dispatch
reset_application! if Dependencies.load?
Breakpoint.deactivate_drb if defined?(BREAKPOINT_SERVER_PORT)
end
def prepare_breakpoint
return unless defined?(BREAKPOINT_SERVER_PORT)
require 'breakpoint'
Breakpoint.activate_drb("druby://localhost:#{BREAKPOINT_SERVER_PORT}", nil, !defined?(FastCGI))
true
rescue
nil
end
# If the block raises, send status code as a last-ditch response.
def failsafe_response(output, status)
yield
rescue Object
begin
output.write "Status: #{status}\r\n"
rescue Object
end
end
end
end
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