Class: BSON::BSON_RUBY

Inherits:
Object
  • Object
show all
Defined in:
lib/bson/bson_ruby.rb

Overview

A BSON seralizer/deserializer in pure Ruby.

Constant Summary collapse

DEFAULT_MAX_BSON_SIZE = 
4 * 1024 * 1024
MINKEY = 
-1
EOO = 
0
NUMBER = 
1
STRING = 
2
OBJECT = 
3
ARRAY = 
4
BINARY = 
5
UNDEFINED = 
6
OID = 
7
BOOLEAN = 
8
DATE = 
9
NULL = 
10
REGEX = 
11
REF = 
12
CODE = 
13
SYMBOL = 
14
CODE_W_SCOPE = 
15
NUMBER_INT = 
16
TIMESTAMP = 
17
NUMBER_LONG = 
18
MAXKEY = 
127
INT32_MIN = 
-(1 << 31) + 1
INT32_MAX = 
(1 << 31) - 1
INT64_MIN = 
-2**64 / 2
INT64_MAX = 
2**64 / 2 - 1
UTF8_ENCODING = 
Encoding.find('utf-8')
BINARY_ENCODING = 
Encoding.find('binary')
@@max_bson_size = 
DEFAULT_MAX_BSON_SIZE

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(max_bson_size = BSON::DEFAULT_MAX_BSON_SIZE) ⇒ BSON_RUBY

Returns a new instance of BSON_RUBY.



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# File 'lib/bson/bson_ruby.rb', line 56

def initialize(max_bson_size=BSON::DEFAULT_MAX_BSON_SIZE)
  @buf = ByteBuffer.new('', max_bson_size)
  @encoder = BSON_RUBY
end

Class Method Details

.deserialize(buf = nil) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 118

def self.deserialize(buf=nil)
  new.deserialize(buf)
end

.max_bson_size ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 89

def self.max_bson_size
  warn "BSON::BSON_CODER.max_bson_size is deprecated and will be removed in v2.0."
  @@max_bson_size
end

.serialize(obj, check_keys = false, move_id = false, max_bson_size = BSON::DEFAULT_MAX_BSON_SIZE) ⇒ Object

Serializes an object. Implemented to ensure an API compatible with BSON extension.



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# File 'lib/bson/bson_ruby.rb', line 114

def self.serialize(obj, check_keys=false, move_id=false, max_bson_size=BSON::DEFAULT_MAX_BSON_SIZE)
  new(max_bson_size).serialize(obj, check_keys, move_id)
end

.serialize_cstr(buf, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 94

def self.serialize_cstr(buf, val)
  buf.put_binary(to_utf8_binary(val.to_s))
  buf.put_binary(NULL_BYTE)
end

.serialize_key(buf, key) ⇒ Object

Raises:



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# File 'lib/bson/bson_ruby.rb', line 99

def self.serialize_key(buf, key)
  raise InvalidDocument, "Key names / regex patterns must not contain the NULL byte" if key.include? "\x00"
  self.serialize_cstr(buf, key)
end

.to_utf8_binary(str) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 65

def self.to_utf8_binary(str)
  begin
    str.unpack("U*")
  rescue
    raise InvalidStringEncoding, "String not valid utf-8: #{str.inspect}"
  end
  str.dup.force_encoding(BINARY_ENCODING)
end

.update_max_bson_size(connection) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 84

def self.update_max_bson_size(connection)
  warn "BSON::BSON_CODER.update_max_bson_size is deprecated and now a no-op. It will be removed in v2.0."
  @@max_bson_size = connection.max_bson_size
end

Instance Method Details

#bson_type(o) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 590

def bson_type(o)
  case o
  when nil
    NULL
  when Integer
    NUMBER_INT
  when Float
    NUMBER
  when ByteBuffer
    BINARY
  when Code
    CODE_W_SCOPE
  when String
    STRING
  when Array
    ARRAY
  when Regexp
    REGEX
  when ObjectId
    OID
  when DBRef
    REF
  when true, false
    BOOLEAN
  when Time
    DATE
  when Hash
    OBJECT
  when Symbol
    SYMBOL
  when MaxKey
    MAXKEY
  when MinKey
    MINKEY
  when Timestamp
    TIMESTAMP
  when Numeric
    raise InvalidDocument, "Cannot serialize the Numeric type #{o.class} as BSON; only Fixum, Bignum, and Float are supported."
  when Date, DateTime
    raise InvalidDocument, "#{o.class} is not currently supported; " +
    "use a UTC Time instance instead."
  else
    if defined?(ActiveSupport::Multibyte::Chars) && o.is_a?(ActiveSupport::Multibyte::Chars)
      STRING
    elsif defined?(ActiveSupport::TimeWithZone) && o.is_a?(ActiveSupport::TimeWithZone)
      raise InvalidDocument, "ActiveSupport::TimeWithZone is not currently supported; " +
      "use a UTC Time instance instead."
    else
      raise InvalidDocument, "Cannot serialize #{o.class} as a BSON type; it either isn't supported or won't translate to BSON."
    end
  end
end

#deserialize(buf = nil) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 209

def deserialize(buf=nil)
  # If buf is nil, use @buf, assumed to contain already-serialized BSON.
  # This is only true during testing.
  if buf.is_a? String
    @buf = ByteBuffer.new(buf.unpack("C*")) if buf
  else
    @buf = ByteBuffer.new(buf.to_a) if buf
  end
  @buf.rewind
  @buf.get_int                # eat message size
  doc = BSON::OrderedHash.new
  while @buf.more?
    type = @buf.get
    case type
    when STRING, CODE
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_string_data(@buf)
    when SYMBOL
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_string_data(@buf).intern
    when NUMBER
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_number_data(@buf)
    when NUMBER_INT
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_number_int_data(@buf)
    when NUMBER_LONG
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_number_long_data(@buf)
    when OID
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_oid_data(@buf)
    when ARRAY
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_array_data(@buf)
    when REGEX
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_regex_data(@buf)
    when OBJECT
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_object_data(@buf)
    when BOOLEAN
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_boolean_data(@buf)
    when DATE
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_date_data(@buf)
    when NULL
      key = deserialize_cstr(@buf)
      doc[key] = nil
    when UNDEFINED
      key = deserialize_cstr(@buf)
      doc[key] = nil
    when REF
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_dbref_data(@buf)
    when BINARY
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_binary_data(@buf)
    when CODE_W_SCOPE
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_code_w_scope_data(@buf)
    when TIMESTAMP
      key = deserialize_cstr(@buf)
      doc[key] = deserialize_timestamp_data(@buf)
    when MAXKEY
      key = deserialize_cstr(@buf)
      doc[key] = MaxKey.new
    when MINKEY, 255 # This is currently easier than unpack the type byte as an unsigned char.
      key = deserialize_cstr(@buf)
      doc[key] = MinKey.new
    when EOO
      break
    else
      raise "Unknown type #{type}, key = #{key}"
    end
  end
  @buf.rewind
  doc
end

#deserialize_array_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 337

def deserialize_array_data(buf)
  h = deserialize_object_data(buf)
  a = []
  h.each { |k, v| a[k.to_i] = v }
  a
end

#deserialize_binary_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 406

def deserialize_binary_data(buf)
  len = buf.get_int
  type = buf.get
  len = buf.get_int if type == Binary::SUBTYPE_BYTES
  Binary.new(buf.get(len), type)
end

#deserialize_boolean_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 310

def deserialize_boolean_data(buf)
  buf.get == 1
end

#deserialize_code_w_scope_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 381

def deserialize_code_w_scope_data(buf)
  buf.get_int
  len = buf.get_int
  code = buf.get(len)[0..-2]
  if code.respond_to? "pack"
    code = code.pack("C*")
  end

  scope_size = buf.get_int
  buf.position -= 4
  scope = @encoder.new().deserialize(buf.get(scope_size))

  Code.new(encoded_str(code), scope)
end

#deserialize_cstr(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 580

def deserialize_cstr(buf)
  chars = ""
  while true
    b = buf.get
    break if b == 0
    chars << b.chr
  end
  encoded_str(chars)
end

#deserialize_date_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 305

def deserialize_date_data(buf)
  milliseconds = buf.get_long
  Time.at(milliseconds.to_f / 1000.0).utc # at() takes fractional seconds
end

#deserialize_dbref_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 400

def deserialize_dbref_data(buf)
  ns = deserialize_string_data(buf)
  oid = deserialize_oid_data(buf)
  DBRef.new(ns, oid)
end

#deserialize_number_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 314

def deserialize_number_data(buf)
  buf.get_double
end

#deserialize_number_int_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 318

def deserialize_number_int_data(buf)
  buf.get_int
end

#deserialize_number_long_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 322

def deserialize_number_long_data(buf)
  buf.get_long
end

#deserialize_object_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 326

def deserialize_object_data(buf)
  size = buf.get_int
  buf.position -= 4
  object = @encoder.new().deserialize(buf.get(size))
  if object.has_key? "$ref"
    DBRef.new(object["$ref"], object["$id"])
  else
    object
  end
end

#deserialize_oid_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 396

def deserialize_oid_data(buf)
  ObjectId.new(buf.get(12))
end

#deserialize_regex_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 344

def deserialize_regex_data(buf)
  str = deserialize_cstr(buf)
  options_str = deserialize_cstr(buf)
  opts = 0
  opts |= Regexp::IGNORECASE if options_str.include?('i')
  opts |= Regexp::MULTILINE if options_str.include?('m')
  opts |= Regexp::MULTILINE if options_str.include?('s')
  opts |= Regexp::EXTENDED if options_str.include?('x')
  Regexp.new(str, opts)
end

#deserialize_string_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 371

def deserialize_string_data(buf)
  len = buf.get_int
  bytes = buf.get(len)
  str = bytes[0..-2]
  if str.respond_to? "pack"
    str = str.pack("C*")
  end
  encoded_str(str)
end

#deserialize_timestamp_data(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 355

def deserialize_timestamp_data(buf)
  increment = buf.get_int
  seconds = buf.get_int
  Timestamp.new(seconds, increment)
end

#encoded_str(str) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 361

def encoded_str(str)
  if RUBY_VERSION >= '1.9'
    str.force_encoding("utf-8")
    if Encoding.default_internal
      str.encode!(Encoding.default_internal)
    end
  end
  str
end

#hex_dump ⇒ Object

For debugging.



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# File 'lib/bson/bson_ruby.rb', line 291

def hex_dump
  str = ''
  @buf.to_a.each_with_index { |b,i|
    if (i % 8) == 0
      str << "\n" if i > 0
      str << '%4d:  ' % i
    else
      str << ' '
    end
    str << '%02X' % b
  }
  str
end

#serialize(obj, check_keys = false, move_id = false) ⇒ Object

Raises:



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# File 'lib/bson/bson_ruby.rb', line 122

def serialize(obj, check_keys=false, move_id=false)
  raise(InvalidDocument, "BSON.serialize takes a Hash but got a #{obj.class}") unless obj.is_a?(Hash)
  raise "Document is null" unless obj

  @buf.rewind
  # put in a placeholder for the total size
  @buf.put_int(0)

  # Write key/value pairs. Always write _id first if it exists.
  if move_id
    if obj.has_key? '_id'
      serialize_key_value('_id', obj['_id'], false)
    elsif obj.has_key? :_id
      serialize_key_value('_id', obj[:_id], false)
    end
    obj.each {|k, v| serialize_key_value(k, v, check_keys) unless k == '_id' || k == :_id }
  else
    if obj.has_key?('_id') && obj.has_key?(:_id)
      obj['_id'] = obj.delete(:_id)
    end
    obj.each {|k, v| serialize_key_value(k, v, check_keys) }
  end

  serialize_eoo_element(@buf)
  if @buf.size > @buf.max_size
    raise InvalidDocument, "Document is too large (#{@buf.size}). " +
     "This BSON documents is limited to #{@buf.max_size} bytes."
  end
  @buf.put_int(@buf.size, 0)
  @buf
end

#serialize_array_element(buf, key, val, check_keys) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 488

def serialize_array_element(buf, key, val, check_keys)
  # Turn array into hash with integer indices as keys
  h = BSON::OrderedHash.new
  i = 0
  val.each { |v| h[i] = v; i += 1 }
  serialize_object_element(buf, key, h, check_keys, ARRAY)
end

#serialize_binary_element(buf, key, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 429

def serialize_binary_element(buf, key, val)
  buf.put(BINARY)
  self.class.serialize_key(buf, key)

  bytes = val.to_a
  num_bytes = bytes.length
  subtype = val.respond_to?(:subtype) ? val.subtype : Binary::SUBTYPE_BYTES
  if subtype == Binary::SUBTYPE_BYTES
    buf.put_int(num_bytes + 4)
    buf.put(subtype)
    buf.put_int(num_bytes)
    buf.put_array(bytes)
  else
    buf.put_int(num_bytes)
    buf.put(subtype)
    buf.put_array(bytes)
  end
end

#serialize_boolean_element(buf, key, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 448

def serialize_boolean_element(buf, key, val)
  buf.put(BOOLEAN)
  self.class.serialize_key(buf, key)
  buf.put(val ? 1 : 0)
end

#serialize_code_w_scope(buf, key, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 563

def serialize_code_w_scope(buf, key, val)
  buf.put(CODE_W_SCOPE)
  self.class.serialize_key(buf, key)

  # Make a hole for the length
  len_pos = buf.position
  buf.put_int(0)

  buf.put_int(val.code.length + 1)
  self.class.serialize_cstr(buf, val.code)
  buf.put_array(@encoder.new.serialize(val.scope).to_a)

  end_pos = buf.position
  buf.put_int(end_pos - len_pos, len_pos)
  buf.position = end_pos
end

#serialize_date_element(buf, key, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 454

def serialize_date_element(buf, key, val)
  buf.put(DATE)
  self.class.serialize_key(buf, key)
  millisecs = (val.to_f * 1000).to_i
  buf.put_long(millisecs)
end

#serialize_dbref_element(buf, key, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 422

def serialize_dbref_element(buf, key, val)
  oh = BSON::OrderedHash.new
  oh['$ref'] = val.namespace
  oh['$id'] = val.object_id
  serialize_object_element(buf, key, oh, false)
end

#serialize_eoo_element(buf) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 413

def serialize_eoo_element(buf)
  buf.put(EOO)
end

#serialize_key_value(k, v, check_keys) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 160

def serialize_key_value(k, v, check_keys)
  k = k.to_s
  if check_keys
    if k[0] == ?$
      raise InvalidKeyName.new("key #{k} must not start with '$'")
    end
    if k.include? ?.
      raise InvalidKeyName.new("key #{k} must not contain '.'")
    end
  end
  type = bson_type(v)
  case type
  when STRING, SYMBOL
    serialize_string_element(@buf, k, v, type)
  when NUMBER, NUMBER_INT
    serialize_number_element(@buf, k, v, type)
  when OBJECT
    serialize_object_element(@buf, k, v, check_keys)
  when OID
    serialize_oid_element(@buf, k, v)
  when ARRAY
    serialize_array_element(@buf, k, v, check_keys)
  when REGEX
    serialize_regex_element(@buf, k, v)
  when BOOLEAN
    serialize_boolean_element(@buf, k, v)
  when DATE
    serialize_date_element(@buf, k, v)
  when NULL
    serialize_null_element(@buf, k)
  when REF
    serialize_dbref_element(@buf, k, v)
  when BINARY
    serialize_binary_element(@buf, k, v)
  when UNDEFINED
    serialize_null_element(@buf, k)
  when CODE_W_SCOPE
    serialize_code_w_scope(@buf, k, v)
  when MAXKEY
    serialize_max_key_element(@buf, k)
  when MINKEY
    serialize_min_key_element(@buf, k)
  when TIMESTAMP
    serialize_timestamp_element(@buf, k, v)
  else
    raise "unhandled type #{type}"
  end
end

#serialize_max_key_element(buf, key) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 518

def serialize_max_key_element(buf, key)
  buf.put(MAXKEY)
  self.class.serialize_key(buf, key)
end

#serialize_min_key_element(buf, key) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 523

def serialize_min_key_element(buf, key)
  buf.put(MINKEY)
  self.class.serialize_key(buf, key)
end

#serialize_null_element(buf, key) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 417

def serialize_null_element(buf, key)
  buf.put(NULL)
  self.class.serialize_key(buf, key)
end

#serialize_number_element(buf, key, val, type) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 461

def serialize_number_element(buf, key, val, type)
  if type == NUMBER
    buf.put(type)
    self.class.serialize_key(buf, key)
    buf.put_double(val)
  else
    if val > INT64_MAX or val < INT64_MIN
      raise RangeError.new("MongoDB can only handle 8-byte ints")
    end
    if val > INT32_MAX or val < INT32_MIN
      buf.put(NUMBER_LONG)
      self.class.serialize_key(buf, key)
      buf.put_long(val)
    else
      buf.put(type)
      self.class.serialize_key(buf, key)
      buf.put_int(val)
    end
  end
end

#serialize_object_element(buf, key, val, check_keys, opcode = OBJECT) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 482

def serialize_object_element(buf, key, val, check_keys, opcode=OBJECT)
  buf.put(opcode)
  self.class.serialize_key(buf, key)
  buf.put_array(@encoder.new.serialize(val, check_keys).to_a)
end

#serialize_oid_element(buf, key, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 536

def serialize_oid_element(buf, key, val)
  buf.put(OID)
  self.class.serialize_key(buf, key)

  buf.put_array(val.to_a)
end

#serialize_regex_element(buf, key, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 496

def serialize_regex_element(buf, key, val)
  buf.put(REGEX)
  self.class.serialize_key(buf, key)

  str = val.source
  # We use serialize_key here since regex patterns aren't prefixed with
  # length (can't contain the NULL byte).
  self.class.serialize_key(buf, str)

  options = val.options
  options_str = ''
  options_str << 'i' if ((options & Regexp::IGNORECASE) != 0)
  if ((options & Regexp::MULTILINE) != 0)
    options_str << 'm'
    options_str << 's'
  end
  options_str << 'x' if ((options & Regexp::EXTENDED) != 0)
  options_str << val.extra_options_str if val.respond_to?(:extra_options_str)
  # Must store option chars in alphabetical order
  self.class.serialize_cstr(buf, options_str.split(//).sort.uniq.join)
end

#serialize_string_element(buf, key, val, type) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 543

def serialize_string_element(buf, key, val, type)
  buf.put(type)
  self.class.serialize_key(buf, key)

  # Make a hole for the length
  len_pos = buf.position
  buf.put_int(0)

  # Save the string
  start_pos = buf.position
  self.class.serialize_cstr(buf, val)
  end_pos = buf.position

  # Put the string size in front
  buf.put_int(end_pos - start_pos, len_pos)

  # Go back to where we were
  buf.position = end_pos
end

#serialize_timestamp_element(buf, key, val) ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 528

def serialize_timestamp_element(buf, key, val)
  buf.put(TIMESTAMP)
  self.class.serialize_key(buf, key)

  buf.put_int(val.increment)
  buf.put_int(val.seconds)
end

#to_a ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 104

def to_a
  @buf.to_a
end

#to_s ⇒ Object 



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# File 'lib/bson/bson_ruby.rb', line 108

def to_s
  @buf.to_s
end

#unpack(arg) ⇒ Object

Returns the array stored in the buffer. Implemented to ensure an API compatible with BSON extension.



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# File 'lib/bson/bson_ruby.rb', line 156

def unpack(arg)
  @buf.to_a
end