Class: CoAP::Message

Inherits:
Struct
  • Object
show all
Defined in:
lib/coap/message.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Message

convenience: .new(tt?, mcode?, mid?, payload?, hash)



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# File 'lib/coap/message.rb', line 6

def initialize(*args)     # convenience: .new(tt?, mcode?, mid?, payload?, hash)
  if args.size < 6
    h = args.pop.dup
    tt = h.delete(:tt) || args.shift
    mcode = h.delete(:mcode) || args.shift
    case mcode
    when Integer then mcode = METHODS[mcode] || [mcode >> 5, mcode & 0x1f]
    when Float then mcode = [mcode.to_i, (mcode * 100 % 100).round] # accept 2.05 and such
    end
    mid = h.delete(:mid) || args.shift
    payload = h.delete(:payload) || args.shift || EMPTY # no payload = empty payload
    fail 'CoRE::CoAPMessage.new: hash or all args' unless args.empty?
    super(1, tt, mcode, mid, h, payload)
  else
    super
  end
end

Instance Attribute Details

#mcode ⇒ Object

Returns the value of attribute mcode

Returns:

  • (Object) —

    the current value of mcode



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# File 'lib/coap/message.rb', line 5

def mcode
  @mcode
end

#mid ⇒ Object

Returns the value of attribute mid

Returns:

  • (Object) —

    the current value of mid



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# File 'lib/coap/message.rb', line 5

def mid
  @mid
end

#options ⇒ Object

Returns the value of attribute options

Returns:

  • (Object) —

    the current value of options



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# File 'lib/coap/message.rb', line 5

def options
  @options
end

#payload ⇒ Object

Returns the value of attribute payload

Returns:

  • (Object) —

    the current value of payload



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# File 'lib/coap/message.rb', line 5

def payload
  @payload
end

#tt ⇒ Object

Returns the value of attribute tt

Returns:

  • (Object) —

    the current value of tt



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# File 'lib/coap/message.rb', line 5

def tt
  @tt
end

#ver ⇒ Object

Returns the value of attribute ver

Returns:

  • (Object) —

    the current value of ver



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# File 'lib/coap/message.rb', line 5

def ver
  @ver
end

Class Method Details

.decode_options_and_put_together(b1, tt, mcode, mid, options, payload) ⇒ Object 



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# File 'lib/coap/message.rb', line 87

def self.decode_options_and_put_together(b1, tt, mcode, mid, options, payload)
  # check and decode option values
  decoded_options = DEFAULTING_OPTIONS.dup
  options.each_pair do |k, v|
    if oinfo = OPTIONS[k]
      oname, _, minmax, repeatable, decoder, _ = *oinfo
      repeatable or v.size <= 1 or
        fail ArgumentError, "repeated unrepeatable option #{oname}"
      v.each do |v1|
        unless minmax === v1.bytesize
          fail ArgumentError, "#{v1.inspect} out of #{minmax} for #{oname}"
        end
      end
      decoded_options[oname] = decoder.call(v)
    else
      decoded_options[k] = v # we don't know what that is -- keep it in raw
    end
  end

  new(b1, tt, mcode, mid, Hash[decoded_options], payload) # XXX: why Hash[] again?
end

.deklausify(d, dpos, len) ⇒ Object 



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# File 'lib/coap/message.rb', line 33

def self.deklausify(d, dpos, len)
  case len
  when 0..12
    [len, dpos]
  when 13
    [d.getbyte(dpos) + 13, dpos += 1]
  when 14
    [d.byteslice(dpos, 2).unpack('n')[0] + 269, dpos += 2]
  else
    fail "[#{d.inspect}] Bad delta/length nibble #{len} at #{dpos}"
  end
end

.parse(d) ⇒ Object 



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# File 'lib/coap/message.rb', line 46

def self.parse(d)
  # dpos keeps our current position in parsing d
  b1, mcode, mid = d.unpack('CCn'); dpos = 4
  toklen = b1 & 0xf
  token = d.byteslice(dpos, toklen); dpos += toklen
  b1 >>= 4
  tt = TTYPES[b1 & 0x3]
  b1 >>= 2
  fail ArgumentError, "unknown CoAP version #{b1}" unless b1 == 1
  mcode = METHODS[mcode] || [mcode >> 5, mcode & 0x1F]

  # collect options
  onumber = 0             # current option number
  options = Hash.new { |h, k| h[k] = [] }
  dlen = d.bytesize
  while dpos < dlen
    tl1 = d.getbyte(dpos); dpos += 1
    fail ArgumentError, "option is not there at #{dpos} with oc #{orig_numopt}" unless tl1 # XXX

    break if tl1 == 0xff

    odelta, dpos = deklausify(d, dpos, tl1 >> 4)
    olen, dpos = deklausify(d, dpos, tl1 & 0xF)

    onumber += odelta

    if dpos + olen > dlen
      fail ArgumentError, "#{olen}-byte option at #{dpos} -- not enough data in #{dlen} total"
    end

    oval = d.byteslice(dpos, olen); dpos += olen
    options[onumber] << oval
  end

  options[TOKEN_ON] = [token] if token != ''

  # d.bytesize = more than all the rest...
  decode_options_and_put_together(b1, tt, mcode, mid, options,
                                  d.byteslice(dpos, d.bytesize))
end

Instance Method Details

#klausify(n) ⇒ Object 



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# File 'lib/coap/message.rb', line 130

def klausify(n)
  if n < 13
    [n, '']
  else
    n -= 13
    if n < 256
      [13, [n].pack('C')]
    else
      [14, [n - 256].pack('n')]
    end
  end
end

#mcode_readable ⇒ Object 



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# File 'lib/coap/message.rb', line 24

def mcode_readable
  case mcode
  when Array
    "#{mcode[0]}.#{"%02d" % mcode[1]}"
  else
    mcode.to_s
  end
end

#prepare_options ⇒ Object 



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# File 'lib/coap/message.rb', line 109

def prepare_options
  prepared_options = {}
  options.each do |k, v|
    # puts "k = #{k.inspect}, oinfo_i = #{OPTIONS_I[k].inspect}"
    if oinfo_i = OPTIONS_I[k]
      onum, oname, defv, minmax, rep, _, encoder = *oinfo_i
      prepared_options[onum] = a = encoder.call(v)
      rep or a.size <= 1 or fail "repeated option #{oname} #{a.inspect}"
      a.each do |v1|
        unless minmax === v1.bytesize
          fail ArgumentError, "#{v1.inspect} out of #{minmax} for #{oname}"
        end
      end
    else
      fail ArgumentError, "#{k.inspect}: unknown option" unless Integer === k
      prepared_options[k] = Array(v) # store raw option
    end
  end
  prepared_options
end

#to_wire ⇒ Object 



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# File 'lib/coap/message.rb', line 143

def to_wire
  # check and encode option values
  prepared_options = prepare_options
  # puts "prepared_options: #{prepared_options}"

  token = (prepared_options.delete(TOKEN_ON) || [nil])[0] || ''
  # puts "TOKEN: #{token.inspect}" unless token

  b1 = 0x40 | TTYPES_I[tt] << 4 | token.bytesize
  b2 = METHODS_I[mcode] || (mcode[0] << 5) + mcode[1]
  result = [b1, b2, mid].pack('CCn')
  result << token

  # stuff options in packet
  onumber = 0
  num_encoded_options = 0

  prepared_options.keys.sort.each do |k|
    fail "Bad Option Type #{k.inspect}" unless Integer === k && k >= 0
    a = prepared_options[k]
    a.each do |v|
      # result << frob(k, v)
      odelta = k - onumber
      onumber = k

      odelta1, odelta2 = klausify(odelta)
      odelta1 <<= 4

      length1, length2 = klausify(v.bytesize)
      result << [odelta1 | length1].pack('C')
      result << odelta2
      result << length2
      result << v.dup.force_encoding(BIN)         # value
    end

  end

  if payload != ''
    result << 0xFF
    result << payload.dup.force_encoding(BIN)
  end
  result
end