class Redis::Connection::Hiredis

def self.connect(config)
  connection = ::Hiredis::Connection.new
  connect_timeout = (config.fetch(:connect_timeout, 0) * 1_000_000).to_i
  if config[:scheme] == "unix"
    connection.connect_unix(config[:path], connect_timeout)
  elsif config[:scheme] == "rediss" || config[:ssl]
    raise NotImplementedError, "SSL not supported by hiredis driver"
  else
    connection.connect(config[:host], config[:port], connect_timeout)
  end
  instance = new(connection)
  instance.timeout = config[:read_timeout]
  instance
rescue Errno::ETIMEDOUT
  raise TimeoutError
end

def connected?
  @connection&.connected?
end

def disconnect
  @connection.disconnect
  @connection = nil
end

def initialize(connection)
  @connection = connection
end

def read
  reply = @connection.read
  reply = CommandError.new(reply.message) if reply.is_a?(RuntimeError)
  reply
rescue Errno::EAGAIN
  raise TimeoutError
rescue RuntimeError => err
  raise ProtocolError, err.message
end

def timeout=(timeout)
  # Hiredis works with microsecond timeouts
  @connection.timeout = Integer(timeout * 1_000_000)
end

def write(command)
  @connection.write(command.flatten(1))
rescue Errno::EAGAIN
  raise TimeoutError
end