Class: Cosmos::UdpInterface

Inherits:
Interface show all
Defined in:
lib/cosmos/interfaces/udp_interface.rb

Overview

Base class for interfaces that send and receive messages over UDP

Constant Summary

Constants included from Api

Api::SETTINGS_KEY, Api::SUBSCRIPTION_DELIMITER

Constants included from ApiShared

ApiShared::DEFAULT_TLM_POLLING_RATE

Constants included from Extract

Extract::SCANNING_REGULAR_EXPRESSION

Instance Attribute Summary

Attributes inherited from Interface

#auto_reconnect, #bytes_read, #bytes_written, #cmd_routers, #config_params, #connect_on_startup, #disable_disconnect, #interfaces, #name, #num_clients, #options, #override_tlm, #packet_log_writer_pairs, #protocol_info, #raw_logger_pair, #read_count, #read_protocols, #read_queue_size, #read_raw_data, #read_raw_data_time, #reconnect_delay, #routers, #state, #stored_packet_log_writer_pairs, #target_names, #write_count, #write_protocols, #write_queue_size, #written_raw_data, #written_raw_data_time

Instance Method Summary collapse

Methods inherited from Interface

#_normalize_tlm, #_override, #_override_tlm, #_override_tlm_raw, #_write, #add_protocol, #as_json, #convert_data_to_packet, #convert_packet_to_data, #copy_to, #read_allowed?, #read_interface_base, #set_option, #start_raw_logging, #stop_raw_logging, #write, #write_allowed?, #write_interface_base, #write_raw, #write_raw_allowed?

Methods included from Api

#_get_cnt, #_limits_group, #_validate_tlm_type, #build_cmd_output_string, #cmd, #cmd_implementation, #cmd_no_checks, #cmd_no_hazardous_check, #cmd_no_range_check, #cmd_raw, #cmd_raw_no_checks, #cmd_raw_no_hazardous_check, #cmd_raw_no_range_check, #connect_interface, #connect_router, #delete_config, #disable_limits, #disable_limits_group, #disconnect_interface, #disconnect_router, #enable_limits, #enable_limits_group, #get_all_cmd_info, #get_all_cmd_tlm_info, #get_all_commands, #get_all_commands_list, #get_all_interface_info, #get_all_router_info, #get_all_settings, #get_all_target_info, #get_all_telemetry, #get_all_telemetry_list, #get_all_tlm_info, #get_cmd_buffer, #get_cmd_cnt, #get_cmd_hazardous, #get_cmd_time, #get_cmd_value, #get_command, #get_interface, #get_interface_names, #get_item, #get_limits, #get_limits_events, #get_limits_groups, #get_limits_set, #get_limits_sets, #get_oldest_logfile, #get_out_of_limits, #get_overall_limits_state, #get_packet_derived_items, #get_packets, #get_parameter, #get_router, #get_router_names, #get_saved_config, #get_setting, #get_settings, #get_stale, #get_target, #get_target_list, #get_telemetry, #get_tlm_buffer, #get_tlm_cnt, #get_tlm_packet, #get_tlm_values, #inject_tlm, #limits_enabled?, #list_configs, #list_settings, #load_config, #normalize_tlm, #override_tlm, #save_config, #save_setting, #send_raw, #set_limits, #set_limits_set, #set_tlm, #set_tlm_process_args, #start_raw_logging_interface, #start_raw_logging_router, #stop_raw_logging_interface, #stop_raw_logging_router, #subscribe_packets, #tlm, #tlm_formatted, #tlm_process_args, #tlm_raw, #tlm_variable, #tlm_with_units

Constructor Details

#initialize(hostname, write_dest_port, read_port, write_src_port = nil, interface_address = nil, ttl = 128, write_timeout = 10.0, read_timeout = nil, bind_address = '0.0.0.0') ⇒ UdpInterface

Returns a new instance of UdpInterface.

Parameters:

  • hostname (String) —

    Machine to connect to

  • write_dest_port (Integer) —

    Port to write commands to

  • read_port (Integer) —

    Port to read telemetry from

  • write_src_port (Integer) (defaults to: nil) —

    Port to allow replies if needed

  • interface_address (String) (defaults to: nil) —

    If the destination machine represented by hostname supports multicast, then interface_address is used to configure the outgoing multicast address.

  • ttl (Integer) (defaults to: 128) —

    Time To Live value. The number of intermediate routers allowed before dropping the packet.

  • write_timeout (Integer) (defaults to: 10.0) —

    Seconds to wait before aborting writes

  • read_timeout (Integer) (defaults to: nil) —

    Seconds to wait before aborting reads

  • bind_address (String) (defaults to: '0.0.0.0') —

    Address to bind UDP ports to



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# File 'lib/cosmos/interfaces/udp_interface.rb', line 39

def initialize(
  hostname,
  write_dest_port,
  read_port,
  write_src_port = nil,
  interface_address = nil,
  ttl = 128, # default for Windows
  write_timeout = 10.0,
  read_timeout = nil,
  bind_address = '0.0.0.0'
)

  super()
  @hostname = ConfigParser.handle_nil(hostname)
  if @hostname
    @hostname = @hostname.to_s
    @hostname = '127.0.0.1' if @hostname.casecmp('LOCALHOST').zero?
  end
  @write_dest_port = ConfigParser.handle_nil(write_dest_port)
  @write_dest_port = write_dest_port.to_i if @write_dest_port
  @read_port = ConfigParser.handle_nil(read_port)
  @read_port = read_port.to_i if @read_port
  @write_src_port = ConfigParser.handle_nil(write_src_port)
  @write_src_port = @write_src_port.to_i if @write_src_port
  @interface_address = ConfigParser.handle_nil(interface_address)
  if @interface_address && @interface_address.casecmp('LOCALHOST').zero?
    @interface_address = '127.0.0.1'
  end
  @ttl = ttl.to_i
  @ttl = 1 if @ttl < 1
  @write_timeout = ConfigParser.handle_nil(write_timeout)
  @write_timeout = @write_timeout.to_f if @write_timeout
  @read_timeout = ConfigParser.handle_nil(read_timeout)
  @read_timeout = @read_timeout.to_f if @read_timeout
  @bind_address = ConfigParser.handle_nil(bind_address)
  if @bind_address && @bind_address.casecmp('LOCALHOST').zero?
    @bind_address = '127.0.0.1'
  end
  @write_socket = nil
  @read_socket = nil
  @read_allowed = false unless @read_port
  @write_allowed = false unless @write_dest_port
  @write_raw_allowed = false unless @write_dest_port
end

Instance Method Details

#connect ⇒ Object

Creates a new Cosmos::UdpWriteSocket if the the write_dest_port was given in the constructor and a new Cosmos::UdpReadSocket if the read_port was given in the constructor.



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# File 'lib/cosmos/interfaces/udp_interface.rb', line 87

def connect
  if @read_port and @write_dest_port and @write_src_port and (@read_port == @write_src_port)
    @read_socket = UdpReadWriteSocket.new(
      @read_port,
      @bind_address,
      @write_dest_port,
      @hostname,
      @interface_address,
      @ttl
    )
    @write_socket = @read_socket
  else
    @read_socket = UdpReadSocket.new(
      @read_port,
      @hostname,
      @interface_address,
      @bind_address
    ) if @read_port
    @write_socket = UdpWriteSocket.new(
      @hostname,
      @write_dest_port,
      @write_src_port,
      @interface_address,
      @ttl,
      @bind_address
    ) if @write_dest_port
  end
  @thread_sleeper = nil
end

#connected? ⇒ Boolean

Returns Whether the active ports (read and/or write) have created sockets. Since UDP is connectionless, creation of the sockets is used to determine connection.

Returns:

  • (Boolean) —

    Whether the active ports (read and/or write) have created sockets. Since UDP is connectionless, creation of the sockets is used to determine connection.



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# File 'lib/cosmos/interfaces/udp_interface.rb', line 120

def connected?
  if @write_dest_port && @read_port
    (@write_socket && @read_socket) ? true : false
  elsif @write_dest_port
    @write_socket ? true : false
  else
    @read_socket ? true : false
  end
end

#disconnect ⇒ Object

Close the active ports (read and/or write) and set the sockets to nil.



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# File 'lib/cosmos/interfaces/udp_interface.rb', line 131

def disconnect
  if @write_socket != @read_socket
    Cosmos.close_socket(@write_socket)
  end
  Cosmos.close_socket(@read_socket)
  @write_socket = nil
  @read_socket = nil
  @thread_sleeper.cancel if @thread_sleeper
  @thread_sleeper = nil
end

#read ⇒ Object 



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# File 'lib/cosmos/interfaces/udp_interface.rb', line 142

def read
  return super() if @read_port

  # Write only interface so stop the thread which calls read
  @thread_sleeper = Sleeper.new
  @thread_sleeper.sleep(1_000_000_000) while connected?
  return nil
end

#read_interface ⇒ Object

Reads from the socket if the read_port is defined



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# File 'lib/cosmos/interfaces/udp_interface.rb', line 152

def read_interface
  data = @read_socket.read(@read_timeout)
  Logger.info "#{@name}: Udp read returned 0 bytes (stream closed)" if data.length <= 0
  read_interface_base(data)
  return data
rescue IOError # Disconnected
  return nil
end

#write_interface(data) ⇒ Object

Writes to the socket

Parameters:

  • data (String) —

    Raw packet data



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# File 'lib/cosmos/interfaces/udp_interface.rb', line 163

def write_interface(data)
  write_interface_base(data)
  @write_socket.write(data, @write_timeout)
  data
end