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#
# Dispatcher
#
# Dispatch a request so it get's handled by the correct handler.
#
# The dispatcher hands a request to one handler after the other until one of
# them responds.
#
# This is similar to the Chain of Responsibility patter but we iterate over the
# 'handler_chain' array instead of a linked list.
#
# To change the order of handlers or add other handlers change the array in the
# handler_chain function.
#
require 'nickserver/request'
require 'nickserver/handler_chain'
require 'nickserver/request_handlers/invalid_email_handler'
require 'nickserver/request_handlers/local_email_handler'
require 'nickserver/request_handlers/leap_email_handler'
require 'nickserver/request_handlers/hkp_email_handler'
require 'nickserver/request_handlers/fingerprint_handler'
module Nickserver
class Dispatcher
def initialize(responder)
@responder = responder
end
def respond_to(params, headers)
request = Nickserver::Request.new params, headers
response = handle request
send_response response
end
protected
def handle(request)
handler_chain.handle request
rescue RuntimeError => exc
puts "Error: #{exc}"
puts exc.backtrace
ErrorResponse.new(exc.to_s)
end
def handler_chain
@handler_chain ||= init_handler_chain
end
def init_handler_chain
chain = HandlerChain.new RequestHandlers::InvalidEmailHandler,
RequestHandlers::LocalEmailHandler,
RequestHandlers::LeapEmailHandler,
RequestHandlers::HkpEmailHandler,
RequestHandlers::FingerprintHandler,
Proc.new {|_req| proxy_error_response },
Proc.new { Nickserver::Response.new(404, "404 Not Found\n") }
chain.continue_on HTTP::ConnectionError
return chain
end
def proxy_error_response
exception = handler_chain.rescued_exceptions.first
if exception
Nickserver::Response.new(502, exception.to_s)
end
end
def send_response(response)
responder.respond response.status, response.content
end
attr_reader :responder
end
end
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