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voldemort-serializer.rb
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voldemort-serializer.rb
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require 'json'
require 'voldemort-rb'
class VoldemortJsonBinarySerializer
attr_accessor :has_version
attr_accessor :type_def_versions
BYTE_MIN_VAL = -128
SHORT_MIN_VAL = -32768
SHORT_MAX_VAL = 2 ** 15 - 1
INT_MIN_VAL = -2147483648
LONG_MIN_VAL = -9223372036854775808
FLOAT_MIN_VAL = 2 ** -149
DOUBLE_MIN_VAL = 2 ** -1074
def initialize(type_def_versions)
@has_version = true
@type_def_versions = {}
# convert versioned json strings to ruby objects
type_def_versions.each_pair do |version, json_type_def_version|
@type_def_versions[version.to_i] = get_type_def(json_type_def_version)
end
end
def to_signed(unsigned, bits)
max_unsigned = 2 ** bits
max_signed = 2 ** (bits - 1)
to_signed = proc { |n| (n >= max_signed) ? n - max_unsigned : n }
return to_signed[unsigned]
end
def get_type_def(json_type_def_version)
# replace all single quotes with " since the JSON parser wants it this way
json_type_def_version = json_type_def_version.gsub(/\'/, '"')
if((json_type_def_version =~ /[\{\[]/) == 0)
# check if the json is a list or string, since these are
# the only ones that JSON.parse() will work with
return JSON.parse(json_type_def_version)
else
# otherwise it's a primitive, so just strip the quotes
return json_type_def_version.gsub(/\"/, '')
end
end
def read_slice(length, bytes)
substr = bytes[0, length]
bytes.slice!(0..length - 1)
return substr
end
# handle serialization
def to_bytes(object)
bytes = ''
newest_version = type_def_versions.size > 0 ? (type_def_versions.size-1) : 0
type_def = @type_def_versions[newest_version]
if(@has_version)
bytes << newest_version.chr
end
bytes << write(object, type_def)
return bytes
end
def write(object, type)
bytes = ''
if(type.kind_of? Hash)
if(object != nil && !object.kind_of?(Hash))
# TODO throw exception
else
bytes << write_map(object, type)
end
elsif(type.kind_of? Array)
if(object != nil && !object.kind_of?(Array))
# TODO throw exception
else
bytes << write_list(object, type)
end
else
case(type)
when 'string'
bytes << write_string(object)
when 'int8'
bytes << write_int8(object)
when 'int16'
bytes << write_int16(object)
when 'int32'
bytes << write_int32(object)
when 'int64'
bytes << write_int64(object)
when 'float32'
bytes << write_float32(object)
when 'float64'
bytes << write_float64(object)
when 'date'
bytes << write_date(object)
when 'bytes'
bytes << write_bytes(object)
when 'boolean'
bytes << write_boolean(object)
else
# TODO throw unsupported type exception
end
end
if(bytes == '')
return nil
end
return bytes
end
def write_boolean(object)
bytes = ''
if(object == nil)
bytes << [BYTE_MIN_VAL].pack('c')
elsif(object)
bytes << [0x1].pack('c')
else
bytes << [0x0].pack('c')
end
return bytes
end
def write_string(object)
return write_bytes(object)
end
def write_int8(object)
bytes = ''
if(object == BYTE_MIN_VAL)
# TODO throw underflow exception
else
if(object == nil)
object = BYTE_MIN_VAL
end
bytes << [object].pack('c')
end
return bytes
end
def write_int16(object)
bytes = ''
if(object == SHORT_MIN_VAL)
# TODO throw underflow exception
else
if(object == nil)
object = SHORT_MIN_VAL
end
bytes << [object].pack('n')
end
return bytes
end
def write_int32(object)
bytes = ''
if(object == INT_MIN_VAL)
# TODO throw underflow exception
else
if(object == nil)
object = INT_MIN_VAL
end
# reverse here to switch little endian to big endian
# this is because pack('N') is choking on 'bigint', wtf?
bytes << [object].pack('i').reverse
end
return bytes
end
def write_int64(object)
bytes = ''
if(object == LONG_MIN_VAL)
# TODO throw underflow exception
else
if(object == nil)
object = LONG_MIN_VAL
end
# reverse here to switch little endian to big endian
# this is because pack('N') is choking on 'bigint', wtf?
bytes << [object].pack('q').reverse
end
return bytes
end
def write_float32(object)
bytes = ''
if(object == FLOAT_MIN_VAL)
# TODO throw underflow exception
else
if(object == nil)
object = FLOAT_MIN_VAL
end
bytes << [object].pack('g')
end
return bytes
end
def write_float64(object)
bytes = ''
if(object == DOUBLE_MIN_VAL)
# TODO throw underflow exception
else
if(object == nil)
object = DOUBLE_MIN_VAL
end
bytes << [object].pack('G')
end
return bytes
end
def write_date(object)
bytes = ''
if(object == LONG_MIN_VAL)
# TODO throw underflow exception
else
if(object == nil)
bytes << write_int64(nil)
else
bytes << write_int64((object.to_f * 1000).to_i)
end
end
return bytes
end
def write_bytes(object)
bytes = ''
if(object == nil)
bytes << write_int16(-1)
elsif(object.length < SHORT_MAX_VAL)
bytes << write_int16(object.length)
bytes << object
else
# TODO throw "length too long to serialize" exception
end
return bytes
end
def write_map(object, type)
bytes = ''
if(object == nil)
bytes << [-1].pack('c')
else
bytes << [1].pack('c')
if(object.length != type.length)
# TODO throw exception here.. invalid map serialization, expected: but got
else
type.sort.each do |type_pair|
key = type_pair.first
subtype = type_pair.last
if(!object.has_key? key)
# TODO throw "missing property exception"
else
bytes << write(object[key], subtype)
end
end
end
end
return bytes
end
def write_list(object, type)
bytes = ''
if(type.length != 1)
# TODO throw new exception (expected single type in list)
else
entry_type = type.first
if(object == nil)
bytes << write_int16(-1)
elsif(object.length < SHORT_MAX_VAL)
bytes << write_int16(object.length)
object.each do |o|
bytes << write(o, entry_type)
end
else
# TODO throw serialization exception
end
end
return bytes
end
# handle deserialization
def to_object(bytes)
version = 0
if(@has_version)
version = read_slice(1, bytes).to_i
end
type = @type_def_versions[version]
if(type == nil)
# TODO throw exception here
end
return read(bytes, type)
end
def read(bytes, type)
if(type.kind_of? Hash)
return read_map(bytes, type)
elsif(type.kind_of? Array)
return read_list(bytes, type)
else
case(type)
when 'string'
return read_bytes(bytes)
when 'int8'
return read_int8(bytes)
when 'int16'
return read_int16(bytes)
when 'int32'
return read_int32(bytes)
when 'int64'
return read_int64(bytes)
when 'float32'
return read_float32(bytes)
when 'float64'
return read_float64(bytes)
when 'date'
return read_date(bytes)
when 'bytes'
return read_bytes(bytes)
when 'boolean'
return read_boolean(bytes)
# TODO default throw unknown type exception
end
end
end
def read_map(bytes, type)
# convert to char to string, and string to int
if(read_slice(1, bytes).unpack('c').to_s.to_i == -1)
return nil
else
object = {}
type.sort.each do |type_pair|
name = type_pair.first
sub_type = type_pair.last
object[name] = read(bytes, sub_type)
end
return object
end
end
def read_list(bytes, type)
size = read_int16(bytes)
if(size < 0)
return nil
else
object = []
size.times { object << read(bytes, type.first) }
return object
end
end
def read_boolean(bytes)
b = read_slice(1, bytes).unpack('c').first
if(b < 0)
return nil
elsif(b == 0)
return false
else
return true
end
end
def read_int8(bytes)
b = read_slice(1, bytes).unpack("c").first.to_i
if(b == BYTE_MIN_VAL)
return nil
end
return b
end
def read_int16(bytes)
s = to_signed(read_slice(2, bytes).unpack("n").first, 16)
if(s == SHORT_MIN_VAL)
return nil
end
return s
end
def read_int32(bytes)
# reverse here to switch little endian to big endian
# this is because pack('N') is choking on 'bigint', wtf?
i = read_slice(4, bytes).reverse.unpack("i").first.to_i
if(i == INT_MIN_VAL)
return nil
end
return i
end
def read_int64(bytes)
# reverse here to switch little endian to big endian
# this is because pack('N') is choking on 'bigint', wtf?
l = read_slice(8, bytes).reverse.unpack("q").first.to_i
if(l == LONG_MIN_VAL)
return nil
end
return l
end
def read_float32(bytes)
f = read_slice(4, bytes).unpack("g").first.to_f
if(f == FLOAT_MIN_VAL)
return nil
end
return f
end
def read_float64(bytes)
d = read_slice(8, bytes).unpack("G").first.to_f
if(d == DOUBLE_MIN_VAL)
return nil
end
return d
end
def read_date(bytes)
d = read_int64(bytes)
if(d != nil)
d = Time.at((d / 1000).to_i, d % 1000)
end
return d
end
def read_bytes(bytes)
size = read_int16(bytes)
if(size < 0)
return nil
else
return read_slice(size, bytes)
end
end
end
class VoldemortPassThroughSerializer
def initialize(map)
end
def to_bytes(bytes)
bytes
end
def to_object(object)
object
end
end