Class: Thrift::JsonProtocol

Inherits:
BaseProtocol show all
Defined in:
lib/thrift/protocol/json_protocol.rb

Constant Summary collapse

@@kJSONObjectStart = 
'{'
@@kJSONObjectEnd = 
'}'
@@kJSONArrayStart = 
'['
@@kJSONArrayEnd = 
']'
@@kJSONNewline = 
'\n'
@@kJSONBackslash = 
'\\'
@@kJSONStringDelimiter = 
'"'
@@kThriftVersion1 = 
1
@@kThriftNan = 
"NaN"
@@kThriftInfinity = 
"Infinity"
@@kThriftNegativeInfinity = 
"-Infinity"

Instance Attribute Summary

Attributes inherited from BaseProtocol

#trans

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from BaseProtocol

#native?, #read_type, #skip, #write_field, #write_type

Constructor Details

#initialize(trans) ⇒ JsonProtocol

Returns a new instance of JsonProtocol.


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# File 'lib/thrift/protocol/json_protocol.rb', line 152

def initialize(trans)
  super(trans)
  @context = JSONContext.new
  @contexts = Array.new
  @reader = LookaheadReader.new(trans)
end

Class Method Details

.read_syntax_char(reader, ch) ⇒ Object

Read 1 character from the trans and verify that it is the expected character ch. Throw a protocol exception if it is not.


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# File 'lib/thrift/protocol/json_protocol.rb', line 224

def self.read_syntax_char(reader, ch)
  ch2 = reader.read
  if (ch2 != ch)
    raise ProtocolException.new(ProtocolException::INVALID_DATA, "Expected \'#{ch}\' got \'#{ch2}\'.")
  end
end

Instance Method Details

#get_type_id_for_type_name(name) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 188

def get_type_id_for_type_name(name)
  if (name == "tf")
    result = Types::BOOL
  elsif (name == "i8")
    result = Types::BYTE
  elsif (name == "i16")
    result = Types::I16
  elsif (name == "i32")
    result = Types::I32
  elsif (name == "i64")
    result = Types::I64
  elsif (name == "dbl")
    result = Types::DOUBLE
  elsif (name == "str")
    result = Types::STRING
  elsif (name == "rec")
    result = Types::STRUCT
  elsif (name == "map")
    result = Types::MAP
  elsif (name == "set")
    result = Types::SET
  elsif (name == "lst")
    result = Types::LIST
  else
    result = Types::STOP
  end
  if (result == Types::STOP)
    raise NotImplementedError
  end
  return result
end

#get_type_name_for_type_id(id) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 159

def get_type_name_for_type_id(id)
  case id
  when Types::BOOL
    "tf"
  when Types::BYTE
    "i8"
  when Types::I16
    "i16"
  when Types::I32
    "i32"
  when Types::I64
    "i64"
  when Types::DOUBLE
    "dbl"
  when Types::STRING
    "str"
  when Types::STRUCT
    "rec"
  when Types::MAP
    "map"
  when Types::SET
    "set"
  when Types::LIST
    "lst"
  else
    raise NotImplementedError
  end
end

#is_json_numeric(ch) ⇒ Object

Return true if the character ch is in [-+0-9.Ee]; false otherwise


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# File 'lib/thrift/protocol/json_protocol.rb', line 232

def is_json_numeric(ch)
  case ch
  when '+', '-', '.', '0' .. '9', 'E', "e"
    return true
  else
    return false
  end
end

#pop_context ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 246

def pop_context
  @context = @contexts.pop
end

#push_context(context) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 241

def push_context(context)
  @contexts.push(@context)
  @context = context
end

#read_binary ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 759

def read_binary
  read_json_base64
end

#read_bool ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 730

def read_bool
  byte = read_byte
  byte != 0
end

#read_byte ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 735

def read_byte
  read_json_integer
end

#read_double ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 751

def read_double
  read_json_double
end

#read_field_begin ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 681

def read_field_begin
  # Check if we hit the end of the list
  ch = @reader.peek
  if (ch == @@kJSONObjectEnd)
    field_type = Types::STOP
  else
    field_id = read_json_integer
    read_json_object_start
    field_type = get_type_id_for_type_name(read_json_string)
  end
  [nil, field_type, field_id]
end

#read_field_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 694

def read_field_end
  read_json_object_end
end

#read_i16 ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 739

def read_i16
  read_json_integer
end

#read_i32 ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 743

def read_i32
  read_json_integer
end

#read_i64 ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 747

def read_i64
  read_json_integer
end

#read_json_array_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 648

def read_json_array_end
  read_json_syntax_char(@@kJSONArrayEnd)
  pop_context
  nil
end

#read_json_array_start ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 641

def read_json_array_start
  @context.read(@reader)
  read_json_syntax_char(@@kJSONArrayStart)
  push_context(JSONListContext.new)
  nil
end

#read_json_base64 ⇒ Object

Reads a block of base64 characters, decoding it, and returns via str


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# File 'lib/thrift/protocol/json_protocol.rb', line 548

def read_json_base64
  read_json_string.unpack("m")[0]
end

#read_json_double ⇒ Object

Reads a JSON number or string and interprets it as a double.


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# File 'lib/thrift/protocol/json_protocol.rb', line 590

def read_json_double
  @context.read(@reader)
  num = 0
  if (@reader.peek == @@kJSONStringDelimiter)
    str = read_json_string(true)
    # Check for NaN, Infinity and -Infinity
    if (str == @@kThriftNan)
      num = (+1.0/0.0)/(+1.0/0.0)
    elsif (str == @@kThriftInfinity)
      num = +1.0/0.0
    elsif (str == @@kThriftNegativeInfinity)
      num = -1.0/0.0
    else
      if (!@context.escapeNum)
        # Raise exception -- we should not be in a string in this case
        raise ProtocolException.new(ProtocolException::INVALID_DATA, "Numeric data unexpectedly quoted")
      end
      begin
        num = Float(str)
      rescue
        raise ProtocolException.new(ProtocolException::INVALID_DATA, "Expected numeric value; got \"#{str}\"")
      end
    end
  else
    if (@context.escapeNum)
      # This will throw - we should have had a quote if escapeNum == true
      read_json_syntax_char(@@kJSONStringDelimiter)
    end
    str = read_json_numeric_chars
    begin
      num = Float(str)
    rescue
      raise ProtocolException.new(ProtocolException::INVALID_DATA, "Expected numeric value; got \"#{str}\"")
    end
  end
  return num
end

#read_json_escape_char ⇒ Object

Decodes the four hex parts of a JSON escaped string character and returns the character via out.

Note - this only supports Unicode characters in the BMP (U+0000 to U+FFFF); characters above the BMP are encoded as two escape sequences (surrogate pairs), which is not yet implemented


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# File 'lib/thrift/protocol/json_protocol.rb', line 494

def read_json_escape_char
  str = @reader.read
  str += @reader.read
  str += @reader.read
  str += @reader.read
  if RUBY_VERSION >= '1.9'
    str.hex.chr(Encoding::UTF_8)
  else
    str.hex.chr
  end
end

#read_json_integer ⇒ Object

Reads a sequence of characters and assembles them into a number, returning them via num


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# File 'lib/thrift/protocol/json_protocol.rb', line 569

def read_json_integer
  @context.read(@reader)
  if (@context.escapeNum)
    read_json_syntax_char(@@kJSONStringDelimiter)
  end
  str = read_json_numeric_chars

  begin
    num = Integer(str);
  rescue
    raise ProtocolException.new(ProtocolException::INVALID_DATA, "Expected numeric value; got \"#{str}\"")
  end

  if (@context.escapeNum)
    read_json_syntax_char(@@kJSONStringDelimiter)
  end

  return num
end

#read_json_numeric_chars ⇒ Object

Reads a sequence of characters, stopping at the first one that is not a valid JSON numeric character.


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# File 'lib/thrift/protocol/json_protocol.rb', line 554

def read_json_numeric_chars
  str = ""
  while (true)
    ch = @reader.peek
    if (!is_json_numeric(ch))
      break;
    end
    ch = @reader.read
    str += ch
  end
  return str
end

#read_json_object_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 635

def read_json_object_end
  read_json_syntax_char(@@kJSONObjectEnd)
  pop_context
  nil
end

#read_json_object_start ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 628

def read_json_object_start
  @context.read(@reader)
  read_json_syntax_char(@@kJSONObjectStart)
  push_context(JSONPairContext.new)
  nil
end

#read_json_string(skipContext = false) ⇒ Object

Decodes a JSON string, including unescaping, and returns the string via str


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# File 'lib/thrift/protocol/json_protocol.rb', line 507

def read_json_string(skipContext = false)
  # This string's characters must match up with the elements in escape_char_vals.
  # I don't have '/' on this list even though it appears on www.json.org --
  # it is not in the RFC -> it is. See RFC 4627
  escape_chars = "\"\\/bfnrt"

  # The elements of this array must match up with the sequence of characters in
  # escape_chars
  escape_char_vals = [
    '"', '\\', '/', '\b', '\f', '\n', '\r', '\t',
  ]

  if !skipContext
    @context.read(@reader)
  end
  read_json_syntax_char(@@kJSONStringDelimiter)
  ch = ""
  str = ""
  while (true)
    ch = @reader.read
    if (ch == @@kJSONStringDelimiter)
      break
    end
    if (ch == @@kJSONBackslash)
      ch = @reader.read
      if (ch == 'u')
        ch = read_json_escape_char
      else
        pos = escape_chars.index(ch);
        if (pos.nil?) # not found
          raise ProtocolException.new(ProtocolException::INVALID_DATA, "Expected control char, got \'#{ch}\'.")
        end
        ch = escape_char_vals[pos]
      end
    end
    str += ch
  end
  return str
end

#read_json_syntax_char(ch) ⇒ Object

Reads 1 byte and verifies that it matches ch.


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# File 'lib/thrift/protocol/json_protocol.rb', line 484

def read_json_syntax_char(ch)
  JsonProtocol::read_syntax_char(@reader, ch)
end

#read_list_begin ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 712

def read_list_begin
  read_json_array_start
  [get_type_id_for_type_name(read_json_string), read_json_integer]
end

#read_list_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 717

def read_list_end
  read_json_array_end
end

#read_map_begin ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 698

def read_map_begin
  read_json_array_start
  key_type = get_type_id_for_type_name(read_json_string)
  val_type = get_type_id_for_type_name(read_json_string)
  size = read_json_integer
  read_json_object_start
  [key_type, val_type, size]
end

#read_map_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 707

def read_map_end
  read_json_object_end
  read_json_array_end
end

#read_message_begin ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 654

def read_message_begin
  read_json_array_start
  version = read_json_integer
  if (version != @@kThriftVersion1)
    raise ProtocolException.new(ProtocolException::BAD_VERSION, 'Message contained bad version.')
  end
  name = read_json_string
  message_type = read_json_integer
  seqid = read_json_integer
  [name, message_type, seqid]
end

#read_message_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 666

def read_message_end
  read_json_array_end
  nil
end

#read_set_begin ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 721

def read_set_begin
  read_json_array_start
  [get_type_id_for_type_name(read_json_string), read_json_integer]
end

#read_set_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 726

def read_set_end
  read_json_array_end
end

#read_string ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 755

def read_string
  read_json_string
end

#read_struct_begin ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 671

def read_struct_begin
  read_json_object_start
  nil
end

#read_struct_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 676

def read_struct_end
  read_json_object_end
  nil
end

#write_binary(str) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 475

def write_binary(str)
  write_json_base64(str)
end

#write_bool(bool) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 447

def write_bool(bool)
  write_json_integer(bool ? 1 : 0)
end

#write_byte(byte) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 451

def write_byte(byte)
  write_json_integer(byte)
end

#write_double(dub) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 467

def write_double(dub)
  write_json_double(dub)
end

#write_field_begin(name, type, id) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 402

def write_field_begin(name, type, id)
  write_json_integer(id)
  write_json_object_start
  write_json_string(get_type_name_for_type_id(type))
end

#write_field_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 408

def write_field_end
  write_json_object_end
end

#write_field_stop ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 412

def write_field_stop; nil; end

#write_i16(i16) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 455

def write_i16(i16)
  write_json_integer(i16)
end

#write_i32(i32) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 459

def write_i32(i32)
  write_json_integer(i32)
end

#write_i64(i64) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 463

def write_i64(i64)
  write_json_integer(i64)
end

#write_json_array_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 377

def write_json_array_end
  pop_context
  trans.write(@@kJSONArrayEnd)
end

#write_json_array_start ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 371

def write_json_array_start
  @context.write(trans)
  trans.write(@@kJSONArrayStart)
  push_context(JSONListContext.new);
end

#write_json_base64(str) ⇒ Object

Write out the contents of the string as JSON string, base64-encoding the string’s contents, and escaping as appropriate


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# File 'lib/thrift/protocol/json_protocol.rb', line 310

def write_json_base64(str)
  @context.write(trans)
  trans.write(@@kJSONStringDelimiter)
  write_json_string([str].pack("m"))
  trans.write(@@kJSONStringDelimiter)
end

#write_json_char(ch) ⇒ Object

Write the character ch as part of a JSON string, escaping as appropriate.


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# File 'lib/thrift/protocol/json_protocol.rb', line 261

def write_json_char(ch)
  # This table describes the handling for the first 0x30 characters
  # 0 : escape using "\u00xx" notation
  # 1 : just output index
  # <other> : escape using "\<other>" notation
  kJSONCharTable = [
      # 0 1 2 3 4 5 6 7 8 9 A B C D E F
      0, 0, 0, 0, 0, 0, 0, 0,'b','t','n', 0,'f','r', 0, 0, # 0
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, # 1
      1, 1,'"', 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, # 2
  ]

  ch_value = ch[0]
  if (ch_value.kind_of? String)
    ch_value = ch.bytes.first
  end
  if (ch_value >= 0x30)
    if (ch == @@kJSONBackslash) # Only special character >= 0x30 is '\'
      trans.write(@@kJSONBackslash)
      trans.write(@@kJSONBackslash)
    else
      trans.write(ch)
    end
  else
    outCh = kJSONCharTable[ch_value];
    # Check if regular character, backslash escaped, or JSON escaped
    if outCh.kind_of? String
      trans.write(@@kJSONBackslash)
      trans.write(outCh)
    elsif outCh == 1
      trans.write(ch)
    else
      write_json_escape_char(ch)
    end
  end
end

#write_json_double(num) ⇒ Object

Convert the given double to a JSON string, which is either the number, “NaN” or “Infinity” or “-Infinity”.


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# File 'lib/thrift/protocol/json_protocol.rb', line 333

def write_json_double(num)
  @context.write(trans)
  # Normalize output of boost::lexical_cast for NaNs and Infinities
  special = false;
  if (num.nan?)
    special = true;
    val = @@kThriftNan;
  elsif (num.infinite?)
    special = true;
    val = @@kThriftInfinity;
    if (num < 0.0)
      val = @@kThriftNegativeInfinity;
    end
  else
    val = num.to_s
  end

  escapeNum = special || @context.escapeNum
  if (escapeNum)
    trans.write(@@kJSONStringDelimiter)
  end
  trans.write(val)
  if (escapeNum)
    trans.write(@@kJSONStringDelimiter)
  end
end

#write_json_escape_char(ch) ⇒ Object

Write the character ch as a JSON escape sequence (“u00xx”)


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# File 'lib/thrift/protocol/json_protocol.rb', line 251

def write_json_escape_char(ch)
  trans.write('\\u')
  ch_value = ch[0]
  if (ch_value.kind_of? String)
    ch_value = ch.bytes.first
  end
  trans.write(ch_value.to_s(16).rjust(4,'0'))
end

#write_json_integer(num) ⇒ Object

Convert the given integer type to a JSON number, or a string if the context requires it (eg: key in a map pair).


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# File 'lib/thrift/protocol/json_protocol.rb', line 319

def write_json_integer(num)
  @context.write(trans)
  escapeNum = @context.escapeNum
  if (escapeNum)
    trans.write(@@kJSONStringDelimiter)
  end
  trans.write(num.to_s);
  if (escapeNum)
    trans.write(@@kJSONStringDelimiter)
  end
end

#write_json_object_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 366

def write_json_object_end
  pop_context
  trans.write(@@kJSONObjectEnd)
end

#write_json_object_start ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 360

def write_json_object_start
  @context.write(trans)
  trans.write(@@kJSONObjectStart)
  push_context(JSONPairContext.new);
end

#write_json_string(str) ⇒ Object

Write out the contents of the string str as a JSON string, escaping characters as appropriate.


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# File 'lib/thrift/protocol/json_protocol.rb', line 299

def write_json_string(str)
  @context.write(trans)
  trans.write(@@kJSONStringDelimiter)
  str.split('').each do |ch|
    write_json_char(ch)
  end
  trans.write(@@kJSONStringDelimiter)
end

#write_list_begin(etype, size) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 427

def write_list_begin(etype, size)
  write_json_array_start
  write_json_string(get_type_name_for_type_id(etype))
  write_json_integer(size)
end

#write_list_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 433

def write_list_end
  write_json_array_end
end

#write_map_begin(ktype, vtype, size) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 414

def write_map_begin(ktype, vtype, size)
  write_json_array_start
  write_json_string(get_type_name_for_type_id(ktype))
  write_json_string(get_type_name_for_type_id(vtype))
  write_json_integer(size)
  write_json_object_start
end

#write_map_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 422

def write_map_end
  write_json_object_end
  write_json_array_end
end

#write_message_begin(name, type, seqid) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 382

def write_message_begin(name, type, seqid)
  write_json_array_start
  write_json_integer(@@kThriftVersion1)
  write_json_string(name)
  write_json_integer(type)
  write_json_integer(seqid)
end

#write_message_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 390

def write_message_end
  write_json_array_end
end

#write_set_begin(etype, size) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 437

def write_set_begin(etype, size)
  write_json_array_start
  write_json_string(get_type_name_for_type_id(etype))
  write_json_integer(size)
end

#write_set_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 443

def write_set_end
  write_json_array_end
end

#write_string(str) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 471

def write_string(str)
  write_json_string(str)
end

#write_struct_begin(name) ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 394

def write_struct_begin(name)
  write_json_object_start
end

#write_struct_end ⇒ Object 


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# File 'lib/thrift/protocol/json_protocol.rb', line 398

def write_struct_end
  write_json_object_end
end