Is there way to add some commands to connection prelude?

[supercaracal]

Hello,

I'm implementing a cluster client with RedisClient. The cluster client needs to call the READONLY command at connection prelude if we use the scale reading feature of cluster mode. Is there way to add some commands to the prelude without method overriding?

redis-client/lib/redis_client/config.rb

Lines 95 to 107 in f85e2a8

	def build_connection_prelude
	prelude = []
	prelude << if @password
	["HELLO", "3", "AUTH", @username, @password]
	else
	["HELLO", "3"]
	end
	if @db && @db != 0
	prelude << ["SELECT", @db.to_s]
	end
	prelude.freeze
	end

redis-client/lib/redis_client.rb

Lines 551 to 582 in f85e2a8

	def connect
	connection = config.driver.new(
	config,
	connect_timeout: connect_timeout,
	read_timeout: read_timeout,
	write_timeout: write_timeout,
	)
	prelude = config.connection_prelude.dup
	if id
	prelude << ["CLIENT", "SETNAME", id.to_s]
	end
	# The connection prelude is deliberately not sent to Middlewares
	if config.sentinel?
	prelude << ["ROLE"]
	role, = connection.call_pipelined(prelude, nil).last
	config.check_role!(role)
	else
	connection.call_pipelined(prelude, nil)
	end
	connection
	rescue CommandError => error
	if error.message.include?("ERR unknown command `HELLO`")
	raise UnsupportedServer,
	"Your Redis server version is too old. redis-client requires Redis 6+. (#{config.server_url})"
	else
	raise
	end
	end

[byroot]

Not at the moment, but it could make sense to have a prelude: parameter for Config. Feel free to PR that.

But also subclassing Config may make sense, that's that I do for sentinel. But up to you.

[supercaracal]

Thank you for your quick reply. I'll try to override with subclassing because this issue is cluster mode matter.