Class: Murakumo::Server

Inherits:
RExec::Daemon::Base
  • Object
show all
Defined in:
lib/srv/murakumo_server.rb

Overview

RExecに依存しているのでこんな設計に…

Constant Summary collapse

IN = 
Resolv::DNS::Resource::IN

Class Method Summary collapse

Class Method Details

.init(options) ⇒ Object 



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# File 'lib/srv/murakumo_server.rb', line 22

def init(options)
  # クラスインスタンス変数を使わないこと
  @@options = options
  @@cloud = Cloud.new(options)
end

.run ⇒ Object 



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# File 'lib/srv/murakumo_server.rb', line 32

def run
  EventMachine.epoll

  RubyDNS.run_server(:listen => [[:udp, @@options[:dns_address], @@options[:dns_port]]]) do
    # RubyDNS::Serverのコンテキスト
    @logger = @@options[:logger] if @@options[:logger]

    on(:start) do
      if @@options[:socket]
        # 既存のソケットファイルは削除
        FileUtils.rm_f(@@options[:socket])

        # ServerクラスをDRuby化
        DRb.start_service("drbunix:#{@@options[:socket]}", @@cloud)
        File.chmod(0700, @@options[:socket])
        at_exit { FileUtils.rm_f(@@options[:socket]) }
      end

      # HUPでログをローテート
      if @@options[:logger]
        trap(:HUP) do
          if logger = @@options[:logger]
            logdev = logger.instance_variable_get(:@logdev)

            if (dev = logdev.dev).kind_of?(File)
              path = dev.path
              mutex = logdev.instance_variable_get(:@mutex)

              mutex.synchronize do
                dev.reopen(path, 'a')
                dev.sync = true
              end
            end
          end
        end
      end

      # ゴシッププロトコルを開始
      @@cloud.start
    end

    # look up A record
    match(@@cloud.method(:address_exist?), IN::A) do |transaction|
      records = @@cloud.lookup_addresses(transaction.name)

      addrs = []
      min_ttl = nil # 最小のTTLをセット

      records.each do |r|
        address, ttl = r

        if min_ttl.nil? or ttl < min_ttl
          min_ttl = ttl
        end

        addrs << Resolv::DNS::Resource::IN::A.new(address)
      end

      # 直接引数に渡せないので…
      addrs << {:ttl => min_ttl}

      # スループットをあげるためrespond!は呼ばない
      transaction.append!(*addrs)
    end # match

    # look up PTR record
    match(@@cloud.method(:name_exist?), IN::PTR) do |transaction|
      name, ttl = @@cloud.lookup_name(transaction.name)
      name += ".#{@@options[:domain]}" if @@options[:domain]
      transaction.respond!(Resolv::DNS::Name.create("#{name}."), :ttl => ttl)
    end

    if @@options[:resolver]
      otherwise do |transaction|
        transaction.passthrough!(@@options[:resolver])
      end
    end
  end # RubyDNS.run_server
end

.shutdown ⇒ Object

run



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# File 'lib/srv/murakumo_server.rb', line 112

def shutdown
  @@cloud.stop
end

.working_directory=(path) ⇒ Object 



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# File 'lib/srv/murakumo_server.rb', line 28

def working_directory=(path)
  @@base_directory = path
end