class Redis::Connection::Ruby

def self.connect(config)
  if config[:scheme] == "unix"
    raise ArgumentError, "SSL incompatible with unix sockets" if config[:ssl]
    sock = UNIXSocket.connect(config[:path], config[:connect_timeout])
  elsif config[:scheme] == "rediss" || config[:ssl]
    sock = SSLSocket.connect(config[:host], config[:port], config[:connect_timeout], config[:ssl_params])
  else
    sock = TCPSocket.connect(config[:host], config[:port], config[:connect_timeout])
  end
  instance = new(sock)
  instance.timeout = config[:read_timeout]
  instance.write_timeout = config[:write_timeout]
  instance.set_tcp_keepalive config[:tcp_keepalive]
  instance.set_tcp_nodelay if sock.is_a? TCPSocket
  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, 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
rescue OpenSSL::SSL::SSLError => ssl_error
  if ssl_error.message.match?(/SSL_read: unexpected eof while reading/i)
    raise EOFError, ssl_error.message
  else
    raise
  end
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 set_tcp_nodelay
  @sock.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1)
end

def set_tcp_nodelay; end

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

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

def write_timeout=(timeout)
  @sock.write_timeout = timeout
end