Module: AMQP::Client::Table Private

Defined in:
lib/amqp/client/table.rb

Overview

This module is part of a private API. You should avoid using this module if possible, as it may be removed or be changed in the future.

Encode and decode an AMQP table to/from hash, only used internally

Class Method Summary collapse

Class Method Details

.decode(bytes) ⇒ Hash<String, Object>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Decodes an AMQP table into a hash

Returns:

  • (Hash<String, Object>) 


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# File 'lib/amqp/client/table.rb', line 27

def self.decode(bytes)
  hash = {}
  pos = 0
  while pos < bytes.bytesize
    key_len = bytes.getbyte(pos)
    pos += 1
    key = bytes.byteslice(pos, key_len).force_encoding("utf-8")
    pos += key_len
    len, value = decode_field(bytes, pos)
    pos += len + 1
    hash[key] = value
  end
  hash
end

.decode_field(bytes, pos) ⇒ Array<Integer, Object>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Decodes a single value

Returns:

  • (Array<Integer, Object>) —

    Bytes read and the parsed value



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# File 'lib/amqp/client/table.rb', line 92

def self.decode_field(bytes, pos)
  type = bytes[pos]
  pos += 1
  case type
  when "S"
    len = bytes.byteslice(pos, 4).unpack1("L>")
    pos += 4
    [4 + len, bytes.byteslice(pos, len).force_encoding("utf-8")]
  when "F"
    len = bytes.byteslice(pos, 4).unpack1("L>")
    pos += 4
    [4 + len, decode(bytes.byteslice(pos, len))]
  when "A"
    len = bytes.byteslice(pos, 4).unpack1("L>")
    pos += 4
    array_end = pos + len
    a = []
    while pos < array_end
      length, value = decode_field(bytes, pos)
      pos += length + 1
      a << value
    end
    [4 + len, a]
  when "t"
    [1, bytes.getbyte(pos) == 1]
  when "b"
    [1, bytes.byteslice(pos, 1).unpack1("c")]
  when "B"
    [1, bytes.byteslice(pos, 1).unpack1("C")]
  when "s"
    [2, bytes.byteslice(pos, 2).unpack1("s")]
  when "u"
    [2, bytes.byteslice(pos, 2).unpack1("S")]
  when "I"
    [4, bytes.byteslice(pos, 4).unpack1("l>")]
  when "i"
    [4, bytes.byteslice(pos, 4).unpack1("L>")]
  when "l"
    [8, bytes.byteslice(pos, 8).unpack1("q>")]
  when "f"
    [4, bytes.byteslice(pos, 4).unpack1("g")]
  when "d"
    [8, bytes.byteslice(pos, 8).unpack1("G")]
  when "D"
    scale = bytes.getbyte(pos)
    pos += 1
    value = bytes.byteslice(pos, 4).unpack1("L>")
    d = value / (10**scale)
    [5, d]
  when "x"
    len = bytes.byteslice(pos, 4).unpack1("L>")
    [4 + len, bytes.byteslice(pos, len)]
  when "T"
    [8, Time.at(bytes.byteslice(pos, 8).unpack1("Q>"))]
  when "V"
    [0, nil]
  else raise ArgumentError, "unsupported table field type: #{type}"
  end
end

.encode(hash) ⇒ String

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Encodes a hash into a byte array

Parameters:

  • hash (Hash)

Returns:

  • (String) —

    Byte array



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# File 'lib/amqp/client/table.rb', line 11

def self.encode(hash)
  return "" if hash.nil? || hash.empty?

  arr = []
  fmt = String.new
  hash.each do |k, value|
    key = k.to_s
    arr.push(key.bytesize, key)
    fmt << "Ca*"
    encode_field(value, arr, fmt)
  end
  arr.pack(fmt)
end

.encode_field(value, arr, fmt) ⇒ nil

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Encoding a single value in a table

Returns:

  • (nil) 


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# File 'lib/amqp/client/table.rb', line 45

def self.encode_field(value, arr, fmt)
  case value
  when Integer
    if value > 2**31
      arr.push("l", value)
      fmt << "aq>"
    else
      arr.push("I", value)
      fmt << "al>"
    end
  when Float
    arr.push("d", value)
    fmt << "aG"
  when String
    arr.push("S", value.bytesize, value)
    fmt << "aL>a*"
  when Time
    arr.push("T", value.to_i)
    fmt << "aQ>"
  when Array
    value_arr = []
    value_fmt = String.new
    value.each { |e| encode_field(e, value_arr, value_fmt) }
    bytes = value_arr.pack(value_fmt)
    arr.push("A", bytes.bytesize, bytes)
    fmt << "aL>a*"
  when Hash
    bytes = Table.encode(value)
    arr.push("F", bytes.bytesize, bytes)
    fmt << "aL>a*"
  when true
    arr.push("t", 1)
    fmt << "aC"
  when false
    arr.push("t", 0)
    fmt << "aC"
  when nil
    arr << "V"
    fmt << "a"
  else raise ArgumentError, "unsupported table field type: #{value.class}"
  end
  nil
end