Class: Dalli::Protocol::ValueSerializer

Inherits:
Object
  • Object
show all
Defined in:
lib/dalli/protocol/value_serializer.rb

Overview

Dalli::Protocol::ValueSerializer compartmentalizes the logic for managing serialization and deserialization of stored values. It manages interpreting relevant options from both client and request, determining whether to serialize/deserialize on store/retrieve, and processes bitflags as necessary.

Constant Summary collapse

DEFAULTS = 
{
  serializer: Marshal
}.freeze
OPTIONS = 
DEFAULTS.keys.freeze
FLAG_SERIALIZED =

www.hjp.at/zettel/m/memcached_flags.rxml Looks like most clients use bit 0 to indicate native language serialization

0x1
FLAG_UTF8 = 
0x2
@@marshal_warning_logged =

Class variable to track whether the Marshal warning has been logged

false

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(protocol_options) ⇒ ValueSerializer

Returns a new instance of ValueSerializer.



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# File 'lib/dalli/protocol/value_serializer.rb', line 28

def initialize(protocol_options)
  @serialization_options =
    DEFAULTS.merge(protocol_options.slice(*OPTIONS))
  warn_if_marshal_default(protocol_options) unless protocol_options[:silence_marshal_warning]
end

Instance Attribute Details

#serialization_options ⇒ Object

rubocop:disable Style/ClassVars



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# File 'lib/dalli/protocol/value_serializer.rb', line 26

def serialization_options
  @serialization_options
end

Instance Method Details

#retrieve(value, bitflags) ⇒ Object 



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# File 'lib/dalli/protocol/value_serializer.rb', line 41

def retrieve(value, bitflags)
  serialized = bitflags.anybits?(FLAG_SERIALIZED)
  if serialized
    begin
      serializer.load(value)
    rescue StandardError
      raise UnmarshalError, 'Unable to unmarshal value'
    end
  elsif bitflags.anybits?(FLAG_UTF8)
    value.force_encoding(Encoding::UTF_8)
  else
    value
  end
end

#serialize_value(value) ⇒ Object 



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# File 'lib/dalli/protocol/value_serializer.rb', line 60

def serialize_value(value)
  serializer.dump(value)
rescue Timeout::Error => e
  raise e
rescue StandardError => e
  # Serializing can throw several different types of generic Ruby exceptions.
  # Convert to a specific exception so we can special case it higher up the stack.
  exc = Dalli::MarshalError.new(e.message)
  exc.set_backtrace e.backtrace
  raise exc
end

#serializer ⇒ Object 



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# File 'lib/dalli/protocol/value_serializer.rb', line 56

def serializer
  @serialization_options[:serializer]
end

#store(value, req_options, bitflags) ⇒ Object 



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# File 'lib/dalli/protocol/value_serializer.rb', line 34

def store(value, req_options, bitflags)
  return store_raw(value, bitflags) if req_options&.dig(:raw)
  return store_string_fastpath(value, bitflags) if use_string_fastpath?(value, req_options)

  [serialize_value(value), bitflags | FLAG_SERIALIZED]
end