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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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require 'ostruct'
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module CyborgHood
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module DSL
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class ServerApiNode < BaseDSL
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attr_reader :bot, :node_name, :parent_node, :store
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# needed for testing node existence
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reveal :nil?
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reveal :respond_to?
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def initialize(bot, parent_node = nil, ldir = nil, &block)
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@bot = bot
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@parent_node = parent_node
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@ldir = ldir
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# don't call super because we need defered loading
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@blocks = []
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add_behavior(&block)
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@ldir_loaded = false
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cleanup
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end
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def add_behavior(&block)
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if block_given?
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@blocks << block
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else
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return if @ldir_loaded
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Dir.glob(File.join(self.lpath, '*.rb')) do |file|
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logger.debug "Interface: loading file '#{file}'"
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@blocks << File.read(file)
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end
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@ldir_loaded = true
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end
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end
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# string, array (useful for aliases), or regex
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# TODO: name validation
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def node(match, ldir = nil, &block)
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child_node = self.class.new(@bot, self, ldir, &block)
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if match.is_a? Array
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match.each{|n| @nodes[n] = child_node}
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else
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@nodes[match] = child_node
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end
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end
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def on_request(&cb)
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@request_cb = cb
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end
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def _is_node?(session, node_path)
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node = __send__(:find_node, session, node_path)
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not node.nil?
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end
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def _call(session, node_path, args = nil)
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args ||= []
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raise CyberError.new(:unrecoverable, 'api/cyborghood', "wrong format for arguments") unless args.is_a? Array
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node = find_node(session, node_path)
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raise CyberError.new(:unrecoverable, 'api/cyborghood', "unknown node") if node.nil?
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logger.debug "[Server API] Node '#{node_path}' found"
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node.__send__(:request, session, args)
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end
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protected
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def root?
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@parent_node.nil?
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end
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def base_lpath
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File.join(Config::LIB_DIR, 'cyborghood-' + @bot.name.downcase, 'interface')
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end
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def lpath
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parent_lpath = @parent_node.nil? ? self.base_lpath : @parent_node.lpath
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@ldir.nil? ? parent_lpath : File.join(parent_lpath, @ldir)
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end
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def load(node_element = '')
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cleanup
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@node_name = node_element
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@blocks.each do |bl|
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if bl.is_a? String
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instance_eval bl
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else
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instance_eval &bl
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end
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end
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end
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def find_node(session, node_path)
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# node_path is a string argument when interface root node is called, but is a list of node elements later on
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if root?
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logger.debug "[Server API] Looking for node '#{node_path}'"
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node_path = node_path.split("/")
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# remove empty string before first "/"
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node_path.shift
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# initial load
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load
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end
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node_element = node_path.shift
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logger.debug "[Server API] Looking for node element '#{node_element}'"
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if node_element.nil?
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return self
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else
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next_node = find_child_node(node_element)
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if next_node
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next_node.__send__(:load, node_element)
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return next_node.__send__(:find_node, session, node_path)
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else
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return
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end
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end
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end
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def find_child_node(child_node)
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return @nodes[child_node] if @nodes.has_key? child_node
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@nodes.each_pair do |match, node|
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found = if match.is_a? String
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child_node == match
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elsif match.is_a? Regexp
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child_node =~ Regexp.new(match)
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elsif match.is_a? Proc
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match.call.include? child_node
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end
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return node if found
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end
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nil
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end
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class Request
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attr_reader :session, :args, :reply
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def initialize(session, args)
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@session = session
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@args = args
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@reply = {
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:results => {},
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:infos => [],
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:warnings => [],
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:errors => []
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}.to_ostruct
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end
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end
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def request(session, args)
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if @request_cb
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request = Request.new(session, args)
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begin
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@request_cb.call(request)
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# TODO: full reply needed
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request.reply.results
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rescue
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logger.debug "node request error message: " + $!
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logger.debug "node request error backtrace: " + $!.backtrace.join("\n")
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raise CyberError.new(:unrecoverable, 'api/cyborghood', "method call failed: " + $!)
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end
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else
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@nodes.keys.collect do |match|
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if match.is_a? String
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match
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elsif match.is_a? Regexp
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'/' + match.to_s + '/'
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elsif match.is_a? Proc
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match.call
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end
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end.compact.flatten
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end
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end
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def cleanup
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@nodes = {}
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@request_cb = nil
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# data memorized during walk in the node tree
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if root?
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@store = OpenStruct.new
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else
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@store = @parent_node.store
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end
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end
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end
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end
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end
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