feat(ws): websocket connection cooldown time

[Trantorian1]

Is there an existing issue?

• I have searched the existing issues

Motivation

See #335 for more information about implementing rpc v0.8.0-rc0 in Madara.

Request

Add a cmd-line option to set a cooldown time for websocket re-connections coming from the same IP, with the option for no cooldown (defaults to some cooldown). This should work in the following way:

• When a client ends their connection, they need to wait a set time t before they can re-connect.
• After t has elapsed, they are unblocked and can request a new ws connection for that method.

This should work on a per-method basis, so a client subscribing to a new ws rpc method A does not activate the cooldown for another method B, but when they unsubscribe from A they need to wait for a duration of t before they can subscribe to A again. This acts as a simple form of rate limiting, preventing excessive re-connections.

Note

It might also be worth considering banning IPs which repeatedly request to connect within their cooldown period, in which case this should be toggled via a separate cmd-line flag

Solution

Solution should be integrated into a separate param struct along with other websocket rpc arguments. See #341 and #342 for more information.

Are you willing to help with this request?

Yes!