Merge branch 'refactor/request-handling' into 'master'

refactor: restructure the way we handle requests to make it more consistent.

Requests are handled at a lot of different ways in different styles right now.
Let's make this more consistent and flexible to add email lookup at other leap providers.

See merge request !2

1 files changed, 65 insertions, 0 deletions

diff --git a/lib/nickserver/dispatcher.rb b/lib/nickserver/dispatcher.rb
new file mode 100644
index 0000000..8bcfd05
--- /dev/null
+++ b/lib/nickserver/dispatcher.rb
@@ -0,0 +1,65 @@
+#
+# 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/request_handlers/invalid_email_handler'
+require 'nickserver/request_handlers/local_email_handler'
+require 'nickserver/request_handlers/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.status, response.content
+    end
+
+    protected
+
+    def handle(request)
+      handler_chain.each do |handler|
+        response = handler.call request
+        return response if response
+      end
+    rescue RuntimeError => exc
+      puts "Error: #{exc}"
+      puts exc.backtrace
+      ErrorResponse.new(exc.to_s)
+    end
+
+    def handler_chain
+      [
+        RequestHandlers::InvalidEmailHandler.new,
+        RequestHandlers::LocalEmailHandler.new,
+        RequestHandlers::EmailHandler.new,
+        RequestHandlers::FingerprintHandler.new,
+        Proc.new { Nickserver::Response.new(404, "Not Found\n") }
+      ]
+    end
+
+    def send_response(status = 200, content = '')
+      responder.respond status, content
+    end
+
+    attr_reader :responder
+
+  end
+end