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 Extract

Extract::SCANNING_REGULAR_EXPRESSION

Instance Attribute Summary

Attributes inherited from Interface

#auto_reconnect, #bytes_read, #bytes_written, #connect_on_startup, #disable_disconnect, #interfaces, #name, #num_clients, #options, #packet_log_writer_pairs, #raw_logger_pair, #read_count, #read_queue_size, #reconnect_delay, #routers, #target_names, #thread, #write_count, #write_queue_size

Instance Method Summary collapse

Methods inherited from Interface

#copy_to, #post_identify_packet, #read_allowed?, #set_option, #start_raw_logging, #stop_raw_logging, #write_allowed?, #write_raw_allowed?

Methods included from Api

#cmd, #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, #disable_limits, #disable_limits_group, #disconnect_interface, #disconnect_router, #enable_limits, #enable_limits_group, #get_cmd_hazardous, #get_cmd_list, #get_cmd_log_filename, #get_cmd_param_list, #get_cmd_time, #get_cmd_value, #get_interface_names, #get_limits, #get_limits_event, #get_limits_groups, #get_limits_set, #get_limits_sets, #get_out_of_limits, #get_overall_limits_state, #get_packet_data, #get_router_names, #get_server_message_log_filename, #get_stale, #get_target_list, #get_tlm_details, #get_tlm_item_list, #get_tlm_list, #get_tlm_log_filename, #get_tlm_packet, #get_tlm_values, #interface_state, #limits_enabled?, #map_target_to_interface, #router_state, #send_raw, #set_limits, #set_limits_set, #set_tlm, #set_tlm_raw, #start_cmd_log, #start_logging, #start_new_server_message_log, #start_raw_logging_interface, #start_raw_logging_router, #start_tlm_log, #stop_cmd_log, #stop_logging, #stop_raw_logging_interface, #stop_raw_logging_router, #stop_tlm_log, #subscribe_limits_events, #subscribe_packet_data, #tlm, #tlm_formatted, #tlm_raw, #tlm_variable, #tlm_with_units, #unsubscribe_limits_events, #unsubscribe_packet_data

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) ⇒ 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



31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
 
# File 'lib/cosmos/interfaces/udp_interface.rb', line 31

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)
  super()

  @hostname = ConfigParser.handle_nil(hostname)
  if @hostname
    @hostname = @hostname.to_s
    @hostname = '127.0.0.1' if @hostname.upcase == 'LOCALHOST'
  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)
  @interface_address = '127.0.0.1' if @interface_address and @interface_address.upcase == 'LOCALHOST'
  @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
  @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.



70
71
72
73
74
75
76
77
 
# File 'lib/cosmos/interfaces/udp_interface.rb', line 70

def connect
  @write_socket = UdpWriteSocket.new(@hostname,
                                     @write_dest_port,
                                     @write_src_port,
                                     @interface_address,
                                     @ttl) if @write_dest_port
  @read_socket = UdpReadSocket.new(@read_port,@hostname,@interface_address) if @read_port
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.



82
83
84
85
86
87
88
89
90
 
# File 'lib/cosmos/interfaces/udp_interface.rb', line 82

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.



93
94
95
96
97
98
 
# File 'lib/cosmos/interfaces/udp_interface.rb', line 93

def disconnect
  Cosmos.close_socket(@write_socket)
  @write_socket = nil
  Cosmos.close_socket(@read_socket)
  @read_socket = nil
end

#read ⇒ Packet

If the read port was given, the read_socket is read and the data returned in a Packet. bytes_read and read_count are updated.

Returns:



104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
 
# File 'lib/cosmos/interfaces/udp_interface.rb', line 104

def read
  if @read_port
    begin
      data = @read_socket.read(@read_timeout)
      @raw_logger_pair.read_logger.write(data) if @raw_logger_pair
    rescue IOError
      # Disconnected
      Thread.stop
    end

    @bytes_read += data.length
    @read_count += 1

    return Packet.new(nil, nil, :BIG_ENDIAN, nil, data)
  else
    # Write only interface so stop the thread which calls read
    Thread.stop
  end
end

#write(packet) ⇒ Object

If the write_dest_port was given, the write_socket is written with the packet data. bytes_written and write_count are updated.

Parameters:

  • packet (Packet) —

    Packet buffer to write



128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/cosmos/interfaces/udp_interface.rb', line 128

def write(packet)
  if @write_dest_port
    if connected?()
      write_raw(packet.buffer)
    else
      raise "Interface not connected"
    end
  else
    raise "Attempt to write to read only interface"
  end
end

#write_raw(data) ⇒ Object

If the write_dest_port was given, the write_socket is written with the data. bytes_written and write_count are updated.

Parameters:

  • data (String) —

    Raw binary data to write



144
145
146
147
148
149
150
151
152
153
154
155
156
157
 
# File 'lib/cosmos/interfaces/udp_interface.rb', line 144

def write_raw(data)
  if @write_dest_port
    if connected?()
      @write_socket.write(data, @write_timeout)
      @bytes_written += data.length
      @write_count += 1
      @raw_logger_pair.write_logger.write(data) if @raw_logger_pair
    else
      raise "Interface not connected"
    end
  else
    raise "Attempt to write to read only interface"
  end
end