BitWeav preliminary JSON-RPC over HTTP with Basic Auth

rpc.rb

# Ok so I've been looking for over 3 hours in total for a nice, simple, RPC solution for local clients. I couldn't find any, so I built this. 
module BitWeavD
  # We use JSON-RPC over HTTP with basic authentication
  class ClientRPC
    RESPONSE = {
      'result' => [],
      'id' => nil,
      'error' => nil,
    }
  
    # Host a HTTP 1.1 server.
    # Accept only POST requests with content type of 'application/json'.
    # Check immediately whether HTTP Auth is correct, otherwise close connection.
    # Decode the request from JSON to object.
    # Lookup the method in the 'services' table and run it with the args
    # Send back response encoded as JSON blob.
    # Requests: method [string], params [array], id [*]
    # Responses: result [array], error [*], id [*]
    def initialise(port, username, password)
      @server = WEBrick::HTTPServer.new :Port => port
      http_auth_config = { :Realm => 'jsonrpc' }
      http_auth_config[:UserDB] = WEBrick::HTTPAuth::Htpasswd.new ''
      http_auth_config[:UserDB].set_passwd 'jsonrpc', username, password
      @basic_auth = WEBrick::HTTPAuth::BasicAuth.new http_auth_config
      @procedures = {}
    end
    
    def serve
      @server.start
      server.mount_proc '/' do |req, res|
        # Break conditions
        break if req.request_method != 'POST'
        break if req.content_type != 'application/json'
        # XXX break if not localhost
        do
          @basic_auth.authenticate
        rescue auth_exception
          break
        end
        
        request = JSON.parse req.body
        response = RESPONSE
        procedure = @procedures[request['method']]
        
        if procedure == nil do
          response['error'] = "Procedure not found."
        else
          do
            response['result'] = procedure(*request['params'])
          rescue error
            response['error'] = error.to_s
          end
        end
        
        ### Send response
        # this is a notification, and thus has no response
        break if request['id'] == nil
        response['id'] = request['id']
        
        res.body = JSON.dump reponse
      end
    end
    
    # Probably not very good for things
    def shutdown
      server.shutdown
    end
    
    def []=(name, method)
      @procedures[name] = method
    end
  end
end