Class: Cosmos::Packet

Inherits:
Structure
  • Object
show all
Defined in:
lib/cosmos/packets/packet.rb,
lib/cosmos/utilities/simulated_target.rb,
ext/cosmos/ext/packet/packet.c

Overview

Update Packet for Simulated Targets

Direct Known Subclasses

CcsdsPacket, Table

Constant Summary collapse

VALUE_TYPES =

Valid format types

[:RAW, :CONVERTED, :FORMATTED, :WITH_UNITS]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object

Creates a new packet by initalizing the attributes.

Parameters:

  • target_name (String) —

    Name of the target this packet is associated with

  • packet_name (String) —

    Name of the packet

  • default_endianness (Symbol) —

    One of BinaryAccessor::ENDIANNESS

  • description (String) —

    Description of the packet

  • buffer (String) —

    String buffer to hold the packet data

  • item_class (Class) —

    Class used to instantiate items (Must be a subclass of PacketItem)



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# File 'ext/cosmos/ext/packet/packet.c', line 207

static VALUE packet_initialize(int argc, VALUE* argv, VALUE self) {
  VALUE target_name = Qnil;
  VALUE packet_name = Qnil;
  VALUE default_endianness = Qnil;
  VALUE description = Qnil;
  VALUE buffer = Qnil;
  VALUE item_class = Qnil;
  VALUE super_args[3] = {Qnil, Qnil, Qnil};

  switch (argc)
  {
    case 2:
      target_name = argv[0];
      packet_name = argv[1];
      default_endianness = symbol_BIG_ENDIAN;
      description = Qnil;
      buffer = rb_str_new2("");
      item_class = cPacketItem;
      break;
    case 3:
      target_name = argv[0];
      packet_name = argv[1];
      default_endianness = argv[2];
      description = Qnil;
      buffer = rb_str_new2("");
      item_class = cPacketItem;
      break;
    case 4:
      target_name = argv[0];
      packet_name = argv[1];
      default_endianness = argv[2];
      description = argv[3];
      buffer = rb_str_new2("");
      item_class = cPacketItem;
      break;
    case 5:
      target_name = argv[0];
      packet_name = argv[1];
      default_endianness = argv[2];
      description = argv[3];
      buffer = argv[4];
      item_class = cPacketItem;
      break;
    case 6:
      target_name = argv[0];
      packet_name = argv[1];
      default_endianness = argv[2];
      description = argv[3];
      buffer = argv[4];
      item_class = argv[5];
      break;
    default:
      /* Invalid number of arguments given */
      rb_raise(rb_eArgError, "wrong number of arguments (%d for 2..6)", argc);
      break;
  };

  super_args[0] = default_endianness;
  super_args[1] = buffer;
  super_args[2] = item_class;
  rb_call_super(3, super_args);
  target_name_equals(self, target_name);
  packet_name_equals(self, packet_name);
  description_equals(self, description);
  rb_ivar_set(self, id_ivar_received_time, Qnil);
  rb_ivar_set(self, id_ivar_received_count, INT2FIX(0));
  rb_ivar_set(self, id_ivar_id_items, Qnil);
  rb_ivar_set(self, id_ivar_hazardous, Qfalse);
  rb_ivar_set(self, id_ivar_hazardous_description, Qnil);
  rb_ivar_set(self, id_ivar_given_values, Qnil);
  rb_ivar_set(self, id_ivar_limits_items, Qnil);
  rb_ivar_set(self, id_ivar_processors, Qnil);
  rb_ivar_set(self, id_ivar_stale, Qtrue);
  rb_ivar_set(self, id_ivar_limits_change_callback, Qnil);
  rb_ivar_set(self, id_ivar_read_conversion_cache, Qnil);
  rb_ivar_set(self, id_ivar_raw, Qnil);
  rb_ivar_set(self, id_ivar_messages_disabled, Qfalse);
  rb_ivar_set(self, id_ivar_meta, Qnil);
  rb_ivar_set(self, id_ivar_hidden, Qfalse);
  rb_ivar_set(self, id_ivar_disabled, Qfalse);

  return self;
}

Instance Attribute Details

#description ⇒ String (readonly)

Returns Description of the packet.

Returns:

  • (String) —

    Description of the packet



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# File 'lib/cosmos/packets/packet.rb', line 30

def description
  @description
end

#disabled ⇒ Boolean

Returns Whether or not this is a ‘disabled’ packet.

Returns:

  • (Boolean) —

    Whether or not this is a 'disabled' packet



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# File 'lib/cosmos/packets/packet.rb', line 60

def disabled
  @disabled
end

#given_values ⇒ Hash<Item Name, Value>

Containst the values given by the user for a command (distinguished from defaults) These values should be used within command conversions if present because the order that values are written into the actual packet can vary

Returns:

  • (Hash<Item Name, Value>) —

    Given values when constructing the packet



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# File 'lib/cosmos/packets/packet.rb', line 48

def given_values
  @given_values
end

#hazardous ⇒ Boolean

Returns Flag indicating if the packet is hazardous (typically for commands).

Returns:

  • (Boolean) —

    Flag indicating if the packet is hazardous (typically for commands)



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# File 'lib/cosmos/packets/packet.rb', line 39

def hazardous
  @hazardous
end

#hazardous_description ⇒ String

Returns Description of why the packet is hazardous.

Returns:

  • (String) —

    Description of why the packet is hazardous



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# File 'lib/cosmos/packets/packet.rb', line 42

def hazardous_description
  @hazardous_description
end

#hidden ⇒ Boolean

Returns Whether or not this is a ‘hidden’ packet.

Returns:

  • (Boolean) —

    Whether or not this is a 'hidden' packet



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# File 'lib/cosmos/packets/packet.rb', line 57

def hidden
  @hidden
end

#messages_disabled ⇒ Boolean

Returns Whether or not messages should be printed for this packet.

Returns:

  • (Boolean) —

    Whether or not messages should be printed for this packet



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# File 'lib/cosmos/packets/packet.rb', line 63

def messages_disabled
  @messages_disabled
end

#packet_name ⇒ String (readonly)

Returns Name of the packet.

Returns:

  • (String) —

    Name of the packet



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# File 'lib/cosmos/packets/packet.rb', line 27

def packet_name
  @packet_name
end

#packet_rate ⇒ Object

Returns the value of attribute packet_rate.



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# File 'lib/cosmos/utilities/simulated_target.rb', line 19

def packet_rate
  @packet_rate
end

#raw ⇒ Boolean

Returns Whether or not this is a ‘raw’ packet.

Returns:

  • (Boolean) —

    Whether or not this is a 'raw' packet



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# File 'lib/cosmos/packets/packet.rb', line 54

def raw
  @raw
end

#received_count ⇒ Integer (readonly)

Returns Number of times the packet has been received.

Returns:

  • (Integer) —

    Number of times the packet has been received



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# File 'lib/cosmos/packets/packet.rb', line 36

def received_count
  @received_count
end

#received_time ⇒ Time (readonly)

Returns Time at which the packet was received.

Returns:

  • (Time) —

    Time at which the packet was received



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# File 'lib/cosmos/packets/packet.rb', line 33

def received_time
  @received_time
end

#stale ⇒ Boolean (readonly)

Returns Flag indicating if the packet is stale (hasn’t been received recently).

Returns:

  • (Boolean) —

    Flag indicating if the packet is stale (hasn't been received recently)



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# File 'lib/cosmos/packets/packet.rb', line 51

def stale
  @stale
end

#target_name ⇒ String (readonly)

Returns Name of the target this packet is associated with.

Returns:

  • (String) —

    Name of the target this packet is associated with



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# File 'lib/cosmos/packets/packet.rb', line 24

def target_name
  @target_name
end

Instance Method Details

#append_item(name, bit_size, data_type, array_size = nil, endianness = @default_endianness, overflow = :ERROR, format_string = nil, read_conversion = nil, write_conversion = nil, id_value = nil) ⇒ Object

Define an item at the end of the packet. This creates a new instance of the item_class as given in the constructor and adds it to the items hash. It also resizes the buffer to accomodate the new item.

Parameters:

  • name (String) —

    Name of the item. Used by the items hash to retrieve the item.

  • bit_size (Integer) —

    Bit size of the item in the raw buffer

  • data_type (Symbol) —

    Type of data contained by the item. This is dependant on the item_class but by default see StructureItem.

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

    Set to a non nil value if the item is to represented as an array.

  • endianness (Symbol) (defaults to: @default_endianness) —

    Endianness of this item. By default the endianness as set in the constructure is used.

  • overflow (Symbol) (defaults to: :ERROR) —

    How to handle value overflows. This is dependant on the item_class but by default see StructureItem.

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

    String to pass to Kernel#sprintf

  • read_conversion (Conversion) (defaults to: nil) —

    Conversion to apply when reading the item from the packet buffer

  • write_conversion (Conversion) (defaults to: nil) —

    Conversion to apply before writing the item to the packet buffer

  • id_value (Object) (defaults to: nil) —

    Set to something other than nil to indicate that this item should be used to identify a buffer as this packet. The id_value should make sense according to the data_type.



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# File 'lib/cosmos/packets/packet.rb', line 240

def append_item(name, bit_size, data_type, array_size = nil, endianness = @default_endianness, overflow = :ERROR, format_string = nil, read_conversion = nil, write_conversion = nil, id_value = nil)
  item = super(name, bit_size, data_type, array_size, endianness, overflow)
  packet_define_item(item, format_string, read_conversion, write_conversion, id_value)
end

#buffer=(buffer) ⇒ Object

Set the buffer to be used by the structure. The buffer is copied and thus further modifications to the buffer have no effect on the structure items.

Parameters:

  • buffer (String) —

    Buffer of data to back the stucture items



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# File 'lib/cosmos/packets/packet.rb', line 80

def buffer=(buffer)
  synchronize() do
    begin
      internal_buffer_equals(buffer)
    rescue RuntimeError
      Logger.instance.error "#{@target_name} #{@packet_name} received with actual packet length of #{buffer.length} but defined length of #{@defined_length}"
    end
    @read_conversion_cache.clear if @read_conversion_cache
    process()
  end
end

#check_limits(limits_set = :DEFAULT, ignore_persistence = false) ⇒ Object

Check all the items in the packet against their defined limits. Update their internal limits state and persistence and call the limits_change_callback as necessary.

Parameters:

  • limits_set (Symbol) (defaults to: :DEFAULT) —

    Which limits set to check the item values against.

  • ignore_persistence (Boolean) (defaults to: false) —

    Whether to ignore persistence when checking for out of limits



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# File 'lib/cosmos/packets/packet.rb', line 517

def check_limits(limits_set = :DEFAULT, ignore_persistence = false)
  # If check_limits is being called, then a new packet has arrived and
  # this packet is no longer stale
  if @stale
    @stale = false
    set_all_limits_states(nil)
  end

  return unless @limits_items
  @limits_items.each do |item|
    # Verify limits monitoring is enabled for this item
    if item.limits.enabled
      value = read_item(item)

      # Handle state monitoring and value monitoring differently
      if item.states
        handle_limits_states(item, value)
      elsif item.limits.values
        handle_limits_values(item, value, limits_set, ignore_persistence)
      end
    end
  end
end

#clone ⇒ Packet Also known as: dup

Make a light weight clone of this packet. This only creates a new buffer of data and clones the processors. The defined packet items are the same.

Returns:

  • (Packet) —

    A copy of the current packet with a new underlying buffer of data and processors



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# File 'lib/cosmos/packets/packet.rb', line 569

def clone
  packet = super()
  if packet.instance_variable_get("@processors")
    packet.processors.each do |processor_name, processor|
      packet.processors[processor_name] = processor.clone
    end
  end
  packet
end

#define_item(name, bit_offset, bit_size, data_type, array_size = nil, endianness = @default_endianness, overflow = :ERROR, format_string = nil, read_conversion = nil, write_conversion = nil, id_value = nil) ⇒ Object

Define an item in the packet. This creates a new instance of the item_class as given in the constructor and adds it to the items hash. It also resizes the buffer to accomodate the new item.

Parameters:

  • name (String) —

    Name of the item. Used by the items hash to retrieve the item.

  • bit_offset (Integer) —

    Bit offset of the item in the raw buffer

  • bit_size (Integer) —

    Bit size of the item in the raw buffer

  • data_type (Symbol) —

    Type of data contained by the item. This is dependant on the item_class but by default see StructureItem.

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

    Set to a non nil value if the item is to represented as an array.

  • endianness (Symbol) (defaults to: @default_endianness) —

    Endianness of this item. By default the endianness as set in the constructure is used.

  • overflow (Symbol) (defaults to: :ERROR) —

    How to handle value overflows. This is dependant on the item_class but by default see StructureItem.

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

    String to pass to Kernel#sprintf

  • read_conversion (Conversion) (defaults to: nil) —

    Conversion to apply when reading the item from the packet buffer

  • write_conversion (Conversion) (defaults to: nil) —

    Conversion to apply before writing the item to the packet buffer

  • id_value (Object) (defaults to: nil) —

    Set to something other than nil to indicate that this item should be used to identify a buffer as this packet. The id_value should make sense according to the data_type.



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# File 'lib/cosmos/packets/packet.rb', line 221

def define_item(name, bit_offset, bit_size, data_type, array_size = nil, endianness = @default_endianness, overflow = :ERROR, format_string = nil, read_conversion = nil, write_conversion = nil, id_value = nil)
  item = super(name, bit_offset, bit_size, data_type, array_size, endianness, overflow)
  packet_define_item(item, format_string, read_conversion, write_conversion, id_value)
end

#description=(description) ⇒ Object (readonly)

Sets the description of the packet

Parameters:

  • description (String) —

    Description of the packet



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# File 'ext/cosmos/ext/packet/packet.c', line 158

static VALUE description_equals(VALUE self, VALUE description) {
  if (RTEST(description)) {
    if (rb_funcall(description, id_method_class, 0) != rb_cString) {
      rb_raise(rb_eArgError, "description must be a String but is a %s", RSTRING_PTR(rb_funcall(rb_funcall(description, id_method_class, 0), id_method_to_s, 0)));
    }
    rb_ivar_set(self, id_ivar_description, rb_funcall(rb_funcall(description, id_method_clone, 0), id_method_freeze, 0));
  } else {
    rb_ivar_set(self, id_ivar_description, Qnil);
  }
  return rb_ivar_get(self, id_ivar_description);
}

#disable_limits(name) ⇒ Object

Disable limits on an item by name

Parameters:

  • name (String) —

    Name of the item to disable limits



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# File 'lib/cosmos/packets/packet.rb', line 464

def disable_limits(name)
  item = get_item(name)
  item.limits.enabled = false
  unless item.limits.state == :STALE
    old_limits_state = item.limits.state
    item.limits.state = nil
    @limits_change_callback.call(self, item, old_limits_state, nil, false) if @limits_change_callback
  end
end

#enable_limits(name) ⇒ Object

Enable limits on an item by name

Parameters:

  • name (String) —

    Name of the item to enable limits



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# File 'lib/cosmos/packets/packet.rb', line 457

def enable_limits(name)
  get_item(name).limits.enabled = true
end

#formatted(value_type = :CONVERTED, indent = 0, buffer = @buffer) ⇒ String

Create a string that shows the name and value of each item in the packet

Parameters:

  • value_type (Symbol) (defaults to: :CONVERTED) —

    How to convert the item before returning it. Must be one of VALUE_TYPES

  • indent (Integer) (defaults to: 0) —

    Amount to indent before printing the item name

  • buffer (String) (defaults to: @buffer) —

    The binary buffer to write the value to

Returns:

  • (String) —

    String formatted with all the item names and values



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# File 'lib/cosmos/packets/packet.rb', line 427

def formatted(value_type = :CONVERTED, indent = 0, buffer = @buffer)
  return super(value_type, indent, buffer)
end

#get_item(name) ⇒ StructureItem

Returns StructureItem or one of its subclasses.

Parameters:

  • name (String) —

    Name of the item to look up in the items Hash

Returns:



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# File 'lib/cosmos/packets/packet.rb', line 246

def get_item(name)
  super(name)
rescue ArgumentError
  raise "Packet item '#{@target_name} #{@packet_name} #{name.upcase}' does not exist"
end

#id_items ⇒ Array<PacketItem>

Id items are used by the identify? method to determine if a raw buffer of data represents this packet.

Returns:



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# File 'lib/cosmos/packets/packet.rb', line 171

def id_items
  @id_items ||= []
end

#identified? ⇒ TrueClass or FalseClass

Indicates if the packet has been identified

Returns:



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# File 'lib/cosmos/packets/packet.rb', line 193

def identified?
  !@target_name.nil? && !@packet_name.nil?
end

#identify?(buffer) ⇒ Boolean

Tries to identify if a buffer represents the currently defined packet. It does this by iterating over all the packet items that were created with an ID value and checking whether that ID value is present at the correct location in the buffer.

Incorrectly sized buffers will still positively identify if there is enough data to match the ID values. This is to allow incorrectly sized packets to still be processed as well as possible given the incorrectly sized data.

Parameters:

  • buffer (String) —

    Raw buffer of binary data

Returns:

  • (Boolean) —

    Whether or not the buffer of data is this packet



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# File 'ext/cosmos/ext/packet/packet.c', line 92

static VALUE identify(VALUE self, VALUE buffer)
{
  VALUE id_items = rb_ivar_get(self, id_ivar_id_items);
  VALUE item = Qnil;
  VALUE id_value = Qnil;
  VALUE raw_value = Qnil;
  long id_items_length = 0;
  int index = 0;

  if (!RTEST(buffer)) {
    return Qfalse;
  }

  if (!RTEST(id_items)) {
    return Qtrue;
  }

  id_items_length = RARRAY_LEN(id_items);

  for (index = 0; index < id_items_length; index++) {
    item = rb_ary_entry(id_items, index);
    id_value = rb_ivar_get(item, id_ivar_id_value);
    raw_value = protected_read_item_internal(self, item, buffer);
    if (!rb_eql(id_value, raw_value)) {
      return Qfalse;
    }
  }

  return Qtrue;
}

#limits_change_callback=(limits_change_callback) ⇒ Object

Sets the callback object called when a limits state changes

Parameters:

  • limits_change_callback (#call) —

    Object must respond to the call method and take the following arguments: packet (Packet), item (PacketItem), old_limits_state (Symbol), item_value (Object), log_change (Boolean). The current item state can be found by querying the item object: item.limits.state.



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# File 'lib/cosmos/packets/packet.rb', line 159

def limits_change_callback=(limits_change_callback)
  if limits_change_callback
    raise ArgumentError, "limits_change_callback must respond to call" unless limits_change_callback.respond_to?(:call)
    @limits_change_callback = limits_change_callback
  else
    @limits_change_callback = nil
  end
end

#limits_items ⇒ Array<PacketItem>

Returns All items with defined limits.

Returns:



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# File 'lib/cosmos/packets/packet.rb', line 176

def limits_items
  @limits_items ||= []
end

#meta ⇒ Hash<Meta Name, Meta Values>

Returns packet specific metadata

Returns:

  • (Hash<Meta Name, Meta Values>) 


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# File 'lib/cosmos/packets/packet.rb', line 187

def meta
  @meta ||= {}
end

#out_of_limits ⇒ Array<Array<String, String, String, Symbol>>

Return an array of arrays indicating all items in the packet that are out of limits

[[target name, packet name, item name, item limits state], ...]

Returns:



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# File 'lib/cosmos/packets/packet.rb', line 490

def out_of_limits
  items = []
  return items unless @limits_items
  @limits_items.each do |item|
    if (item.limits.enabled && item.limits.state &&
      PacketItemLimits::OUT_OF_LIMITS_STATES.include?(item.limits.state))
      items << [@target_name, @packet_name, item.name, item.limits.state]
    end
  end
  return items
end

#packet_name=(packet_name) ⇒ Object (readonly)

Sets the packet name. Unidentified packets will have packet name set to nil.

Parameters:

  • packet_name (String) —

    Name of the packet



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# File 'ext/cosmos/ext/packet/packet.c', line 143

static VALUE packet_name_equals(VALUE self, VALUE packet_name) {
  if (RTEST(packet_name)) {
    if (rb_funcall(packet_name, id_method_class, 0) != rb_cString) {
      rb_raise(rb_eArgError, "packet_name must be a String but is a %s", RSTRING_PTR(rb_funcall(rb_funcall(packet_name, id_method_class, 0), id_method_to_s, 0)));
    }
    rb_ivar_set(self, id_ivar_packet_name, rb_funcall(rb_funcall(rb_funcall(packet_name, id_method_upcase, 0), id_method_clone, 0), id_method_freeze, 0));
  } else {
    rb_ivar_set(self, id_ivar_packet_name, Qnil);
  }
  return rb_ivar_get(self, id_ivar_packet_name);
}

#processors ⇒ Hash

Returns Hash of processors associated with this packet.

Returns:

  • (Hash) —

    Hash of processors associated with this packet



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# File 'lib/cosmos/packets/packet.rb', line 181

def processors
  @processors ||= {}
end

#read(name, value_type = :CONVERTED, buffer = @buffer) ⇒ Object

Read an item in the packet by name

Parameters:

  • name (String) —

    Name of the item to read

  • value_type (Symbol) (defaults to: :CONVERTED) —

    How to convert the item before returning it. Must be one of VALUE_TYPES

  • buffer (String) (defaults to: @buffer) —

    The binary buffer to read the item from

Returns:

  • The value. :FORMATTED and :WITH_UNITS values are always returned as Strings. :RAW values will match their data_type. :CONVERTED values can be any type.



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# File 'lib/cosmos/packets/packet.rb', line 378

def read(name, value_type = :CONVERTED, buffer = @buffer)
  return super(name, value_type, buffer)
end

#read_all(value_type = :CONVERTED, buffer = @buffer, top = true) ⇒ Array<Array>

Read all items in the packet into an array of arrays

[[item name, item value], ...]

Parameters:

  • top (See Structure#read_all) (defaults to: true)
  • value_type (Symbol) (defaults to: :CONVERTED) —

    How to convert the item before returning it. Must be one of VALUE_TYPES

  • buffer (String) (defaults to: @buffer) —

    The binary buffer to write the value to

Returns:

  • (Array<Array>) —

    Array of two element arrays containing the item name as element 0 and item value as element 1.



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# File 'lib/cosmos/packets/packet.rb', line 399

def read_all(value_type = :CONVERTED, buffer = @buffer, top = true)
  return super(value_type, buffer, top)
end

#read_all_with_limits_states(value_type = :CONVERTED, buffer = @buffer) ⇒ Array<String, Object, Symbol|nil>

Read all items in the packet into an array of arrays

[[item name, item value], [item limits state], ...]

Parameters:

  • value_type (Symbol) (defaults to: :CONVERTED) —

    How to convert the item before returning it. Must be one of VALUE_TYPES

  • buffer (String) (defaults to: @buffer) —

    The binary buffer to write the value to

Returns:

  • (Array<String, Object, Symbol|nil>) —

    Returns an Array consisting of [item name, item value, item limits state] where the item limits state can be one of Limits::LIMITS_STATES



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# File 'lib/cosmos/packets/packet.rb', line 411

def read_all_with_limits_states(value_type = :CONVERTED, buffer = @buffer)
  result = nil
  synchronize_allow_reads(true) do
    result = read_all(value_type, buffer, false).map! do |array|
      array << @items[array[0]].limits.state
    end
  end
  return result
end

#read_item(item, value_type = :CONVERTED, buffer = @buffer) ⇒ Object

Read an item in the packet

Parameters:

  • item (PacketItem) —

    Instance of PacketItem or one of its subclasses

  • value_type (Symbol) (defaults to: :CONVERTED) —

    How to convert the item before returning it. Must be one of VALUE_TYPES

  • buffer (String) (defaults to: @buffer) —

    The binary buffer to read the item from

Returns:

  • The value. :FORMATTED and :WITH_UNITS values are always returned as Strings. :RAW values will match their data_type. :CONVERTED values can be any type.



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# File 'lib/cosmos/packets/packet.rb', line 261

def read_item(item, value_type = :CONVERTED, buffer = @buffer)
  value = super(item, :RAW, buffer)
  case value_type
  when :RAW
    # Done above
  when :CONVERTED, :FORMATTED, :WITH_UNITS
    if item.read_conversion
      using_cached_value = false

      check_cache = buffer.equal?(@buffer)
      if check_cache and @read_conversion_cache
        synchronize_allow_reads() do
          if @read_conversion_cache[item]
            value = @read_conversion_cache[item]
            using_cached_value = true
          end
        end
      end

      unless using_cached_value
        if item.array_size
          value.map! do |val, index|
            item.read_conversion.call(val, self, buffer)
          end
        else
          value = item.read_conversion.call(value, self, buffer)
        end
        if check_cache
          synchronize_allow_reads() do
            @read_conversion_cache ||= {}
            @read_conversion_cache[item] = value
          end
        end
      end
    end

    # Convert from value to state if possible
    if item.states
      if item.array_size
        value = value.map do |val, index|
          if item.states.key(val)
            item.states.key(val)
          else
            apply_format_string_and_units(item, val, value_type)
          end
        end
      else
        state_value = item.states.key(value)
        if state_value
          value = state_value
        else
          value = apply_format_string_and_units(item, value, value_type)
        end
      end
    else
      if item.array_size
        value = value.map do |val, index|
          apply_format_string_and_units(item, val, value_type)
        end
      else
        value = apply_format_string_and_units(item, value, value_type)
      end
    end
  else
    raise ArgumentError, "Unknown value type on read: #{value_type}"
  end
  return value
end

#received_count=(received_count) ⇒ Object (readonly)

Sets the received count of the packet

Parameters:

  • received_count (Integer) —

    Number of times this packet has been received



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# File 'ext/cosmos/ext/packet/packet.c', line 189

static VALUE received_count_equals(VALUE self, VALUE received_count) {
  if (rb_funcall(received_count, id_method_class, 0) != rb_cFixnum) {
    rb_raise(rb_eArgError, "received_count must be a Fixnum but is a %s", RSTRING_PTR(rb_funcall(rb_funcall(received_count, id_method_class, 0), id_method_to_s, 0)));
  }
  rb_ivar_set(self, id_ivar_received_count, received_count);
  return rb_ivar_get(self, id_ivar_received_count);
}

#received_time=(received_time) ⇒ Object (readonly)

Sets the received time of the packet

Parameters:

  • received_time (Time) —

    Time this packet was received



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# File 'ext/cosmos/ext/packet/packet.c', line 173

static VALUE received_time_equals(VALUE self, VALUE received_time) {
  if (RTEST(received_time)) {
    if (rb_funcall(received_time, id_method_class, 0) != rb_cTime) {
      rb_raise(rb_eArgError, "received_time must be a Time but is a %s", RSTRING_PTR(rb_funcall(rb_funcall(received_time, id_method_class, 0), id_method_to_s, 0)));
    }
    rb_ivar_set(self, id_ivar_received_time, rb_funcall(rb_funcall(received_time, id_method_clone, 0), id_method_freeze, 0));
  } else {
    rb_ivar_set(self, id_ivar_received_time, Qnil);
  }
  return rb_ivar_get(self, id_ivar_received_time);
}

#reset ⇒ Object

Reset temporary packet data This includes packet received time, received count, and processor state



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# File 'lib/cosmos/packets/packet.rb', line 550

def reset
  @received_time = nil
  @received_count = 0
  if @read_conversion_cache
    synchronize() do
      @read_conversion_cache.clear
    end
  end
  return unless @processors
  @processors.each do |processor_name, processor|
    processor.reset
  end
end

#restore_defaults(buffer = @buffer) ⇒ Object

Restore all items in the packet to their default value

Parameters:

  • buffer (String) (defaults to: @buffer) —

    Raw buffer of binary data



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# File 'lib/cosmos/packets/packet.rb', line 448

def restore_defaults(buffer = @buffer)
  @sorted_items.each do |item|
    write_item(item, item.default, :CONVERTED, buffer)
  end
end

#set_all_limits_states(state) ⇒ Object

Set the limits state for all items to the given state

Parameters:

  • state (Symbol) —

    Must be one of PacketItemLimits::LIMITS_STATES



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# File 'lib/cosmos/packets/packet.rb', line 505

def set_all_limits_states(state)
  @sorted_items.each {|item| item.limits.state = state}
end

#set_received_time_fast(received_time) ⇒ Object

Sets the received time of the packet (without cloning)

Parameters:

  • received_time (Time) —

    Time this packet was received



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# File 'lib/cosmos/packets/packet.rb', line 117

def set_received_time_fast(received_time)
  @received_time = received_time
  @received_time.freeze if @received_time
end

#set_stale ⇒ Object

Sets the overall packet stale state to true and sets each packet item limits state to :STALE.



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# File 'lib/cosmos/packets/packet.rb', line 543

def set_stale
  @stale = true
  set_all_limits_states(:STALE)
end

#target_name=(target_name) ⇒ Object (readonly)

Sets the target name this packet is associated with. Unidentified packets will have target name set to nil.

Parameters:

  • target_name (String) —

    Name of the target this packet is associated with



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# File 'ext/cosmos/ext/packet/packet.c', line 127

static VALUE target_name_equals(VALUE self, VALUE target_name) {
  if (RTEST(target_name)) {
    if (rb_funcall(target_name, id_method_class, 0) != rb_cString) {
      rb_raise(rb_eArgError, "target_name must be a String but is a %s", RSTRING_PTR(rb_funcall(rb_funcall(target_name, id_method_class, 0), id_method_to_s, 0)));
    }
    rb_ivar_set(self, id_ivar_target_name, rb_funcall(rb_funcall(rb_funcall(target_name, id_method_upcase, 0), id_method_clone, 0), id_method_freeze, 0));
  } else {
    rb_ivar_set(self, id_ivar_target_name, Qnil);
  }
  return rb_ivar_get(self, id_ivar_target_name);
}

#update_limits_items_cache ⇒ Object

Force the packet to update its knowledge of items with limits. This is an optimization so we don’t have to iterate through all the items when checking for limits.



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# File 'lib/cosmos/packets/packet.rb', line 477

def update_limits_items_cache
  # Collect only the items who have limits values or states and then
  # compact the array to remove all the nil values
  @limits_items = @sorted_items.collect do |item|
    item if item.limits.values || item.state_colors
  end
  @limits_items.compact!
end

#write(name, value, value_type = :CONVERTED, buffer = @buffer) ⇒ Object

Write an item in the packet by name

Parameters:

  • name (String) —

    Name of the item to write

  • value (Object) —

    Value based on the item definition. This could be a string, integer, float, or array of values.

  • value_type (Symbol) (defaults to: :CONVERTED) —

    How to convert the item before returning it. Must be one of VALUE_TYPES

  • buffer (String) (defaults to: @buffer) —

    The binary buffer to write the value to



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# File 'lib/cosmos/packets/packet.rb', line 388

def write(name, value, value_type = :CONVERTED, buffer = @buffer)
  super(name, value, value_type, buffer)
end

#write_item(item, value, value_type = :CONVERTED, buffer = @buffer) ⇒ Object

Write an item in the packet

Parameters:

  • item (PacketItem) —

    Instance of PacketItem or one of its subclasses

  • value (Object) —

    Value based on the item definition. This could be a string, integer, float, or array of values.

  • value_type (Symbol) (defaults to: :CONVERTED) —

    How to convert the item before returning it. Must be one of VALUE_TYPES

  • buffer (String) (defaults to: @buffer) —

    The binary buffer to write the value to



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# File 'lib/cosmos/packets/packet.rb', line 336

def write_item(item, value, value_type = :CONVERTED, buffer = @buffer)
  if @read_conversion_cache
    synchronize() do
      @read_conversion_cache.clear
    end
  end
  case value_type
  when :RAW
    super(item, value, value_type, buffer)
  when :CONVERTED
    if item.states
      # Convert from state to value if possible
      state_value = item.states[value.to_s.upcase]
      value = state_value if state_value
    end
    if item.write_conversion
      value = item.write_conversion.call(value, self, buffer)
    else
      raise "Cannot write DERIVED item without a write conversion" if item.data_type == :DERIVED
    end
    begin
      super(item, value, :RAW, buffer) unless item.data_type == :DERIVED
    rescue ArgumentError => err
      if item.states and String === value and err.message =~ /invalid value for/
        raise "Unknown state #{value} for #{item.name}"
      else
        raise err
      end
    end
  when :FORMATTED, :WITH_UNITS
    raise ArgumentError, "Invalid value type on write: #{value_type}"
  else
    raise ArgumentError, "Unknown value type on write: #{value_type}"
  end
end