Module: ZabbixProtocol

Defined in:
lib/zabbix_protocol.rb,
lib/zabbix_protocol/version.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

ZABBIX_HEADER =

www.zabbix.org/wiki/Docs/protocols/zabbix_agent/1.4

"ZBXD"
ZABBIX_VERSION = 
"\x01"
PAYLOAD_LEN_BYTES = 
8
MIN_DATA_LEN = 
ZABBIX_HEADER.bytesize + ZABBIX_VERSION.bytesize + PAYLOAD_LEN_BYTES
VERSION = 
"0.1.5"

Class Method Summary collapse

Class Method Details

.dump(payload) ⇒ Object 



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# File 'lib/zabbix_protocol.rb', line 14

def self.dump(payload)
  if payload.is_a?(Hash)
    payload = MultiJson.dump(payload)
  else
    payload = payload.to_s
  end

  payload.force_encoding('ASCII-8BIT')

  [
    ZABBIX_HEADER,
    ZABBIX_VERSION,
    [payload.bytesize].pack('Q<'),
    payload
  ].join
end

.load(data) ⇒ Object 



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# File 'lib/zabbix_protocol.rb', line 31

def self.load(data)
  unless data.is_a?(String)
    raise TypeError, "wrong argument type #{data.class} (expected String)"
  end

  original_encoding = data.encoding
  data = data.dup
  data.force_encoding('ASCII-8BIT')

  if data.bytesize < MIN_DATA_LEN
    raise Error, "data length is too short (data: #{data.inspect})"
  end

  sliced = data.dup
  header = sliced.slice!(0, ZABBIX_HEADER.bytesize)

  if header != ZABBIX_HEADER
    raise Error, "invalid header: #{header.inspect} (data: #{data.inspect})"
  end

  version = sliced.slice!(0, ZABBIX_VERSION.bytesize)

  if version != ZABBIX_VERSION
    raise Error, "unsupported version: #{version.inspect} (data: #{data.inspect})"
  end

  payload_len = sliced.slice!(0, PAYLOAD_LEN_BYTES)
  payload_len = payload_len.unpack('Q<').first

  if payload_len != sliced.bytesize
    raise Error, "invalid payload length: expected=#{payload_len}, actual=#{sliced.bytesize} (data: #{data.inspect})"
  end

  duplicated = sliced.dup

  begin
    duplicated.force_encoding(original_encoding)
    sliced = duplicated
  rescue
    # XXX: nothing to do
  end

  begin
    MultiJson.load(sliced)
  rescue MultiJson::ParseError
    sliced
  end
end