163 lines
5.8 KiB
Ruby
163 lines
5.8 KiB
Ruby
module ActionController
|
|
# Dispatches requests to the appropriate controller and takes care of
|
|
# reloading the app after each request when Dependencies.load? is true.
|
|
class Dispatcher
|
|
@@guard = Mutex.new
|
|
|
|
class << self
|
|
def define_dispatcher_callbacks(cache_classes)
|
|
unless cache_classes
|
|
# Development mode callbacks
|
|
before_dispatch :reload_application
|
|
after_dispatch :cleanup_application
|
|
end
|
|
|
|
# Common callbacks
|
|
to_prepare :load_application_controller do
|
|
begin
|
|
require_dependency 'application' unless defined?(::ApplicationController)
|
|
rescue LoadError => error
|
|
raise unless error.message =~ /application\.rb/
|
|
end
|
|
end
|
|
|
|
if defined?(ActiveRecord)
|
|
before_dispatch { ActiveRecord::Base.verify_active_connections! }
|
|
to_prepare(:activerecord_instantiate_observers) { ActiveRecord::Base.instantiate_observers }
|
|
end
|
|
|
|
after_dispatch :flush_logger if defined?(RAILS_DEFAULT_LOGGER) && RAILS_DEFAULT_LOGGER.respond_to?(:flush)
|
|
end
|
|
|
|
# Backward-compatible class method takes CGI-specific args. Deprecated
|
|
# in favor of Dispatcher.new(output, request, response).dispatch.
|
|
def dispatch(cgi = nil, session_options = CgiRequest::DEFAULT_SESSION_OPTIONS, output = $stdout)
|
|
new(output).dispatch_cgi(cgi, session_options)
|
|
end
|
|
|
|
# Add a preparation callback. Preparation callbacks are run before every
|
|
# request in development mode, and before the first request in production
|
|
# mode.
|
|
#
|
|
# An optional identifier may be supplied for the callback. If provided,
|
|
# to_prepare may be called again with the same identifier to replace the
|
|
# existing callback. Passing an identifier is a suggested practice if the
|
|
# code adding a preparation block may be reloaded.
|
|
def to_prepare(identifier = nil, &block)
|
|
@prepare_dispatch_callbacks ||= ActiveSupport::Callbacks::CallbackChain.new
|
|
callback = ActiveSupport::Callbacks::Callback.new(:prepare_dispatch, block, :identifier => identifier)
|
|
@prepare_dispatch_callbacks | callback
|
|
end
|
|
|
|
# If the block raises, send status code as a last-ditch response.
|
|
def failsafe_response(fallback_output, status, originating_exception = nil)
|
|
yield
|
|
rescue Exception => exception
|
|
begin
|
|
log_failsafe_exception(status, originating_exception || exception)
|
|
body = failsafe_response_body(status)
|
|
fallback_output.write "Status: #{status}\r\nContent-Type: text/html\r\n\r\n#{body}"
|
|
nil
|
|
rescue Exception => failsafe_error # Logger or IO errors
|
|
$stderr.puts "Error during failsafe response: #{failsafe_error}"
|
|
$stderr.puts "(originally #{originating_exception})" if originating_exception
|
|
end
|
|
end
|
|
|
|
private
|
|
def failsafe_response_body(status)
|
|
error_path = "#{error_file_path}/#{status.to_s[0..3]}.html"
|
|
|
|
if File.exist?(error_path)
|
|
File.read(error_path)
|
|
else
|
|
"<html><body><h1>#{status}</h1></body></html>"
|
|
end
|
|
end
|
|
|
|
def log_failsafe_exception(status, exception)
|
|
message = "/!\\ FAILSAFE /!\\ #{Time.now}\n Status: #{status}\n"
|
|
message << " #{exception}\n #{exception.backtrace.join("\n ")}" if exception
|
|
failsafe_logger.fatal message
|
|
end
|
|
|
|
def failsafe_logger
|
|
if defined?(::RAILS_DEFAULT_LOGGER) && !::RAILS_DEFAULT_LOGGER.nil?
|
|
::RAILS_DEFAULT_LOGGER
|
|
else
|
|
Logger.new($stderr)
|
|
end
|
|
end
|
|
end
|
|
|
|
cattr_accessor :error_file_path
|
|
self.error_file_path = Rails.public_path if defined?(Rails.public_path)
|
|
|
|
include ActiveSupport::Callbacks
|
|
define_callbacks :prepare_dispatch, :before_dispatch, :after_dispatch
|
|
|
|
def initialize(output, request = nil, response = nil)
|
|
@output, @request, @response = output, request, response
|
|
end
|
|
|
|
def dispatch
|
|
@@guard.synchronize do
|
|
begin
|
|
run_callbacks :before_dispatch
|
|
handle_request
|
|
rescue Exception => exception
|
|
failsafe_rescue exception
|
|
ensure
|
|
run_callbacks :after_dispatch, :enumerator => :reverse_each
|
|
end
|
|
end
|
|
end
|
|
|
|
def dispatch_cgi(cgi, session_options)
|
|
if cgi ||= self.class.failsafe_response(@output, '400 Bad Request') { CGI.new }
|
|
@request = CgiRequest.new(cgi, session_options)
|
|
@response = CgiResponse.new(cgi)
|
|
dispatch
|
|
end
|
|
rescue Exception => exception
|
|
failsafe_rescue exception
|
|
end
|
|
|
|
def reload_application
|
|
# Run prepare callbacks before every request in development mode
|
|
run_callbacks :prepare_dispatch
|
|
|
|
Routing::Routes.reload
|
|
ActionView::TemplateFinder.reload! unless ActionView::Base.cache_template_loading
|
|
end
|
|
|
|
# Cleanup the application by clearing out loaded classes so they can
|
|
# be reloaded on the next request without restarting the server.
|
|
def cleanup_application
|
|
ActiveRecord::Base.reset_subclasses if defined?(ActiveRecord)
|
|
Dependencies.clear
|
|
ActiveRecord::Base.clear_reloadable_connections! if defined?(ActiveRecord)
|
|
end
|
|
|
|
def flush_logger
|
|
RAILS_DEFAULT_LOGGER.flush
|
|
end
|
|
|
|
protected
|
|
def handle_request
|
|
@controller = Routing::Routes.recognize(@request)
|
|
@controller.process(@request, @response).out(@output)
|
|
end
|
|
|
|
def failsafe_rescue(exception)
|
|
self.class.failsafe_response(@output, '500 Internal Server Error', exception) do
|
|
if @controller ||= defined?(::ApplicationController) ? ::ApplicationController : Base
|
|
@controller.process_with_exception(@request, @response, exception).out(@output)
|
|
else
|
|
raise exception
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|