raterl

Erlang flow control application heavily inspired in jobs and ratx, ETS based bypasses the jobs_server single process bottleneck while providing rate and counter flow control.

Supports

TODO

• Queues
• Modifiers

Examples

Rate flow control

A typical use case is restricting the number of logins per second on a system, you'd start by the configuration:

[{raterl, [
    {queues, [
        {login_requests, [
            {regulator, [
                {name, max_login_rate}, 
                {type, rate},
                {limit, 100}   %% ensures that we get no more than x logins per second
            ]}
        ]}
    ]}
  ]
}].

Then on the code you ask permission from raterl before accepting a login:

    case raterl:run(login_requests, {rate, max_login_rate}, fun () -> Ret end) of
        limit_reached ->
            {error, throttled};
        Ret -> Ret
    end;

Build

$ rebar3 compile