require 'open-uri' require 'yaml' require 'madeleine' require 'madeleine/automatic' require 'madeleine/zmarshal' require 'web' require 'page' require 'author' require 'file_yard' module AbstractWikiService attr_reader :webs, :system def authenticate(password) password == (@system[:password] || 'instiki') end def create_web(name, address, password = nil) @webs[address] = Web.new(self, name, address, password) unless @webs[address] end def delete_web(address) @webs[address] = nil end def file_yard(web) raise "Web #{@web.name} does not belong to this wiki service" unless @webs.values.include?(web) # TODO cache FileYards FileYard.new("#{self.storage_path}/#{web.address}") end def init_wiki_service @webs = {} @system = {} end def read_page(web_address, page_name) ApplicationController.logger.debug "Reading page '#{page_name}' from web '#{web_address}'" web = @webs[web_address] if web.nil? ApplicationController.logger.debug "Web '#{web_address}' not found" return nil else page = web.pages[page_name] ApplicationController.logger.debug "Page '#{page_name}' #{page.nil? ? 'not' : ''} found" return page end end def remove_orphaned_pages(web_address) @webs[web_address].remove_pages(@webs[web_address].select.orphaned_pages) end def revise_page(web_address, page_name, content, revised_on, author) page = read_page(web_address, page_name) page.revise(content, revised_on, author) page end def rollback_page(web_address, page_name, revision_number, created_at, author_id = nil) page = read_page(web_address, page_name) page.rollback(revision_number, created_at, author_id) page end def setup(password, web_name, web_address) @system[:password] = password create_web(web_name, web_address) end def setup? not (@webs.empty?) end def update_web(old_address, new_address, name, markup, color, additional_style, safe_mode = false, password = nil, published = false, brackets_only = false, count_pages = false) if old_address != new_address @webs[new_address] = @webs[old_address] @webs.delete(old_address) @webs[new_address].address = new_address end web = @webs[new_address] web.refresh_revisions if settings_changed?(web, markup, safe_mode, brackets_only) web.name, web.markup, web.color, web.additional_style, web.safe_mode = name, markup, color, additional_style, safe_mode web.password, web.published, web.brackets_only, web.count_pages = password, published, brackets_only, count_pages end def write_page(web_address, page_name, content, written_on, author) page = Page.new(@webs[web_address], page_name, content, written_on, author) @webs[web_address].add_page(page) page end def storage_path self.class.storage_path end private def settings_changed?(web, markup, safe_mode, brackets_only) web.markup != markup || web.safe_mode != safe_mode || web.brackets_only != brackets_only end end class WikiService include AbstractWikiService include Madeleine::Automatic::Interceptor # These methods do not change the state of persistent objects, and # should not be ogged by Madeleine automatic_read_only :authenticate, :read_page, :setup?, :webs, :storage_path, :file_yard @@storage_path = './storage/' class << self def storage_path=(storage_path) @@storage_path = storage_path end def storage_path @@storage_path end def clean_storage MadeleineServer.clean_storage(self) end def instance @madeleine ||= MadeleineServer.new(self) @system = @madeleine.system return @system end def snapshot @madeleine.snapshot end end def initialize init_wiki_service end end class MadeleineServer attr_reader :storage_path # Clears all the command_log and snapshot files located in the storage directory, so the # database is essentially dropped and recreated as blank def self.clean_storage(service) begin Dir.foreach(service.storage_path) do |file| if file =~ /(command_log|snapshot)$/ File.delete(File.join(service.storage_path, file)) end end rescue Dir.mkdir(service.storage_path) end end def initialize(service) @storage_path = service.storage_path @server = Madeleine::Automatic::AutomaticSnapshotMadeleine.new(service.storage_path, Madeleine::ZMarshal.new) { service.new } start_snapshot_thread end def command_log_present? not Dir[storage_path + '/*.command_log'].empty? end def snapshot @server.take_snapshot end def start_snapshot_thread Thread.new(@server) { hours_since_last_snapshot = 0 while true begin hours_since_last_snapshot += 1 # Take a snapshot if there is a command log, or 24 hours # have passed since the last snapshot if command_log_present? or hours_since_last_snapshot >= 24 ActionController::Base.logger.info "[#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}] " + 'Taking a Madeleine snapshot' snapshot hours_since_last_snapshot = 0 end sleep(1.hour) rescue => e ActionController::Base.logger.error(e) # wait for a minute (not to spoof the log with the same error) # and go back into the loop, to keep trying sleep(1.minute) ActionController::Base.logger.info("Retrying to save a snapshot") end end } end def system @server.system end end