Class: Equity::Manager

Inherits:
Object
  • Object
show all
Defined in:
lib/equity/manager.rb

Constant Summary collapse

CMD_NODE_STATUS = 
"S"
CMD_SHUTDOWN = 
"K"
CMD_WAITDOWN = 
"W"
CMD_NAMES = 
{
  CMD_NODE_STATUS => "status",
  CMD_SHUTDOWN    => "shutdown",
  CMD_WAITDOWN    => "waitdown"
}

Instance Method Summary collapse

Constructor Details

#initialize(nodes, port, debugging = false) ⇒ Manager

Returns a new instance of Manager.



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# File 'lib/equity/manager.rb', line 16

def initialize(nodes, port, debugging = false)
  @nodes = nodes
  @socket = UDPSocket.new
  @socket.bind(nil, port)
  @debugging = debugging
end

Instance Method Details

#process_commands ⇒ Object 



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# File 'lib/equity/manager.rb', line 23

def process_commands
  # Read commands from the network.
  begin
    data, address = @socket.recvfrom_nonblock(4096)
  rescue Errno::EAGAIN
  end
  return unless data
  command = data.split(/#{Controller::Key::SIGNATURE_SEPARATOR}/).first
  debug("received manager command: #{command_name(command)}", address)
  # Verify the signature and ensure that the key used to sign the command
  # is authorized.
  unless verified_data = Controller::Key.verify(data)
    debug("signature verification failed - ignoring command", address)
    return
  end
  unless Controller::Key.signature_key(data).authorized?
    debug("command signed by unauthorized key - ignoring command", address)
    return
  end
  data = verified_data
  # Process the command.
  debug("signature verified - processing command", address)
  case data
  when CMD_NODE_STATUS
    reply = node_status_message
  when CMD_SHUTDOWN
    UDPSocket.new.send(generic_ok_message, 0, address[2], address[1])
    exit
  when CMD_WAITDOWN
    reply = generic_ok_message
    waitdown
  else
    debug("command not understood (#{data.unpack('H*')})", address)
    return
  end
  UDPSocket.new.send(reply, 0, address[2], address[1])
end