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#--
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# CyborgHood, a distributed system management software.
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# Copyright (c) 2009-2010 Marc Dequènes (Duck) <Duck@DuckCorp.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#++
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require 'singleton'
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module CyborgHood
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# the base mixin (not intended to be used directly, but...)
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module CyborgServerInterfaceBase
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NODE_PATTERN = "((?:\/|(?:\/[a-zA-Z0-9._]+)+[?=]?))"
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def self.included(base)
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base.extend(ClassMethods)
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end
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module ClassMethods
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attr_accessor :exported_methods
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attr_accessor :auto_export_public_instance_methods
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def export_method(*syms)
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syms = [syms] unless syms.is_a? Array
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self.exported_methods ||= []
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self.exported_methods += syms.collect{|m| m.to_s }
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end
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def unexport_method(*syms)
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syms = [syms] unless syms.is_a? Array
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self.exported_methods ||= []
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self.exported_methods -= syms.collect{|m| m.to_s }
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end
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def export_parent_methods
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self.export_method *self.superclass.public_instance_methods(false)
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end
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def is_node?(node)
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(node =~ NODE_PATTERN) ? true : false
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end
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end
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def initialize(*args)
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super(*args)
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@config = Config.instance
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self.class.exported_methods ||= []
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self.class.auto_export_public_instance_methods = true
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end
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# convenience method
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def is_node?(node)
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self.class.is_node?(node)
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end
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def api_klasses
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list = self.class.constants.collect do |c|
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cc = self.class.const_get(c)
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(cc.class == Class and cc.ancestors.include? CyborgHood::CyborgServerInterfaceBase) ? [c, cc] : nil
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end.compact
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Hash[list]
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end
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def api_methods
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methods = self.class.exported_methods
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methods += self.class.public_instance_methods(false) if self.class.auto_export_public_instance_methods
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methods -= ["initialize", "__destroy", "method_missing"]
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methods & self.methods
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end
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def api_container_methods
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[]
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end
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def api_containers
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(api_klasses.keys + api_container_methods).sort
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end
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def api_leafs
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(api_methods - api_container_methods).sort
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end
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def api_nodes
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(api_klasses.keys + api_methods).sort
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end
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def find_node_action(session, node_name)
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node_name.gsub!(/^\//, "")
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next_node_name, other_nodes_names = node_name.split('/', 2)
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next_node_klass = next_node_name.nil? ? self.class : api_klasses[next_node_name]
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# inner class or method ?
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if next_node_klass.nil?
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# method is declared ?
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if api_methods.include? next_node_name
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# final node ?
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if other_nodes_names.blank?
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# cannot use method(), as this method may not exist at all (but still
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# be usuable through metaprogramming
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return lambda do |*args|
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r = child_node(next_node_name, session, *args)
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# dynamic tree construction: method may return a node
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if r.is_a? CyborgHood::CyborgServerInterfaceBase
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r.api_nodes
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else
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r
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end
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end
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end
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# not a container, leaving
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return unless self.api_container_methods.include? next_node_name
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next_node = child_node(next_node_name, session)
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else
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# unknown method
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return
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end
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else
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next_node = next_node_klass.instance
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# final node ?
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return next_node.method('api_nodes') if other_nodes_names.blank?
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end
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# search deeper
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if next_node.is_a? CyborgHood::CyborgServerInterfaceBase
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next_node.find_node_action(session, other_nodes_names)
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else
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# it is not a node, so there are no children
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return
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end
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end
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def child_node(next_node_name, session, *args)
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args.unshift session if self.is_a? CyborgHood::CyborgServerStatefulInterface
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self.send(next_node_name, *args)
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end
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def has_node?(cmd)
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not find_node_action(nil, cmd).nil?
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end
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# preliminary incoming message handling
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def call(session, cmd, data)
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action = find_node_action(session, cmd)
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raise "unknown node" if action.nil?
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raise "wrong format for arguments" unless data.is_a? Array
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begin
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action.call(*data)
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rescue
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logger.debug "node action error message: " + $!
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logger.debug "node action error backtrace: " + $!.backtrace.join("\n")
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raise "method call failed: " + $!
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end
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end
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end
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# structural mixins
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module CyborgServerInterface
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def self.included(base)
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base.class_eval("include CyborgServerInterfaceBase")
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base.class_eval("include Singleton")
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base.extend(ClassMethods)
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end
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module ClassMethods
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def dynamic_interface(&resource_generator)
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class_eval do
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class_inheritable_reader :resource_generator
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def method_missing(method_name, *args)
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node_name = method_name.to_s
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if api_methods.include?(node_name)
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self.resource_generator.call(node_name)
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else
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super
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end
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end
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end
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write_inheritable_attribute(:resource_generator, resource_generator)
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end
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end
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end
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module CyborgServerEmbeddedInterface
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def self.included(base)
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base.class_eval("include CyborgServerInterfaceBase")
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base.export_parent_methods
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end
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end
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module CyborgServerStatefulInterface
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def self.included(base)
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base.class_eval("include CyborgServerInterfaceBase")
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base.class_eval("include Singleton")
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base.extend(ClassMethods)
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end
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module ClassMethods
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def stateful_dynamic_interface(resource_key_pattern, &resource_generator)
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class_eval do
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class_inheritable_reader :resource_key_pattern, :resource_generator
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def method_missing(method_name, *args)
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session = args.shift
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node_name = method_name.to_s
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if api_methods.include?(node_name)
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resource_key = self.resource_key_pattern.gsub("#NODE#", node_name)
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session.store.get(resource_key) { self.resource_generator.call(node_name) }
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else
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super
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end
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end
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end
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write_inheritable_attribute(:resource_key_pattern, resource_key_pattern)
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write_inheritable_attribute(:resource_generator, resource_generator)
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end
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end
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end
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# additional mixin
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module CyborgServerRootInterfaceAddon
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PROTOCOL_VERSION = "0.1~"
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def self.included(base)
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list = self.public_instance_methods(false)
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base.class_eval do
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export_method list
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end
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end
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def product_name
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PRODUCT
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end
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def product_version
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VERSION
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end
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def protocol_version
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PROTOCOL_VERSION
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end
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def bot_name
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@config.bot_name
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end
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end
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end
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