Class: Async::Redis::Protocol::RESP

Inherits:
IO::Protocol::Line
  • Object
show all
Defined in:
lib/async/redis/protocol/resp.rb

Constant Summary collapse

CRLF = 
"\r\n".freeze

Instance Method Summary collapse

Constructor Details

#initialize(stream) ⇒ RESP

Returns a new instance of RESP.



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# File 'lib/async/redis/protocol/resp.rb', line 36

def initialize(stream)
  super(stream, CRLF)
end

Instance Method Details

#read_object ⇒ Object Also known as: read_response

def write_lines(*args) puts “write_lines(#Async::Redis::Protocol::RESP.argsargs.inspect)” super end

def read_line result = super puts “read_line #result”

return result end



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# File 'lib/async/redis/protocol/resp.rb', line 78

def read_object
  token = @stream.read(1)
  # puts "token: #{token}"
  
  case token
  when '$'
    length = read_line.to_i
    
    if length == -1
      return nil
    else
      buffer = @stream.read(length)
      read_line # Eat trailing whitespace?
    
      return buffer
    end
  when '*'
    count = read_line.to_i
    array = Array.new(count) {read_object}
    
    return array
  when ':'
    return read_line.to_i
  
  when '-'
    raise ServerError.new(read_line)
  
  when '+'
    return read_line
  
  else
    raise NotImplementedError, "Implementation for token #{token} missing"
  end
end

#write_object(object) ⇒ Object 



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# File 'lib/async/redis/protocol/resp.rb', line 53

def write_object(object)
  case object
  when String
    write_lines("$#{object.bytesize}", object)
  when Array
    write_array(object)
  when Integer
    write_lines(":#{object}")
  else
    write_object(object.to_redis)
  end
end

#write_request(arguments) ⇒ Object

The redis server doesn’t want actual objects (e.g. integers) but only bulk strings. So, we inline it for performance.



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# File 'lib/async/redis/protocol/resp.rb', line 41

def write_request(arguments)
  write_lines("*#{arguments.count}")
  
  arguments.each do |argument|
    string = argument.to_s
    
    write_lines("$#{string.bytesize}", string)
  end
  
  @stream.flush
end