class Redis::Connection::Ruby

def self.connect(config)
  if config[:scheme] == "unix"
    sock = UNIXSocket.connect(config[:path], config[:timeout])
  else
    sock = TCPSocket.connect(config[:host], config[:port], config[:timeout])
  end
  instance = new(sock)
  instance.timeout = config[:timeout]
  instance.set_tcp_keepalive config[:tcp_keepalive]
  instance
end

def connected?
  !! @sock
end

def disconnect
  @sock.close
rescue
ensure
  @sock = nil
end

def format_bulk_reply(line)
  bulklen = line.to_i
  return if bulklen == -1
  reply = encode(@sock.read(bulklen))
  @sock.read(2) # Discard CRLF.
  reply
end

def format_error_reply(line)
  CommandError.new(line.strip)
end

def format_integer_reply(line)
  line.to_i
end

def format_multi_bulk_reply(line)
  n = line.to_i
  return if n == -1
  Array.new(n) { read }
end

def format_reply(reply_type, line)
  case reply_type
  when MINUS    then format_error_reply(line)
  when PLUS     then format_status_reply(line)
  when COLON    then format_integer_reply(line)
  when DOLLAR   then format_bulk_reply(line)
  when ASTERISK then format_multi_bulk_reply(line)
  else raise ProtocolError.new(reply_type)
  end
end

def format_status_reply(line)
  line.strip
end

def get_tcp_keepalive
  {
    :time   => @sock.getsockopt(Socket::SOL_TCP, Socket::TCP_KEEPIDLE).int,
    :intvl  => @sock.getsockopt(Socket::SOL_TCP, Socket::TCP_KEEPINTVL).int,
    :probes => @sock.getsockopt(Socket::SOL_TCP, Socket::TCP_KEEPCNT).int,
  }
end

def get_tcp_keepalive
  {
  }
end

def initialize(sock)
  @sock = sock
end

def read
  line = @sock.gets
  reply_type = line.slice!(0, 1)
  format_reply(reply_type, line)
rescue Errno::EAGAIN
  raise TimeoutError
end

def set_tcp_keepalive(keepalive)
  return unless keepalive.is_a?(Hash)
  @sock.setsockopt(Socket::SOL_SOCKET, Socket::SO_KEEPALIVE,  true)
  @sock.setsockopt(Socket::SOL_TCP,    Socket::TCP_KEEPIDLE,  keepalive[:time])
  @sock.setsockopt(Socket::SOL_TCP,    Socket::TCP_KEEPINTVL, keepalive[:intvl])
  @sock.setsockopt(Socket::SOL_TCP,    Socket::TCP_KEEPCNT,   keepalive[:probes])
end

def set_tcp_keepalive(keepalive)
end

def timeout=(timeout)
  if @sock.respond_to?(:timeout=)
    @sock.timeout = timeout
  end
end

def write(command)
  @sock.write(build_command(command))
end