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|
defmodule Pleroma.Plugs.RateLimiter.LimiterSupervisor do
use DynamicSupervisor
import Cachex.Spec
def start_link(init_arg) do
DynamicSupervisor.start_link(__MODULE__, init_arg, name: __MODULE__)
end
def add_or_return_limiter(limiter_name, expiration) do
result =
DynamicSupervisor.start_child(
__MODULE__,
%{
id: String.to_atom("rl_#{limiter_name}"),
start:
{Cachex, :start_link,
[
limiter_name,
[
expiration:
expiration(
default: expiration,
interval: check_interval(expiration),
lazy: true
)
]
]}
}
)
case result do
{:ok, _pid} = result -> result
{:error, {:already_started, pid}} -> {:ok, pid}
_ -> result
end
end
@impl true
def init(_init_arg) do
DynamicSupervisor.init(strategy: :one_for_one)
end
defp check_interval(exp) do
(exp / 2)
|> Kernel.trunc()
|> Kernel.min(5000)
|> Kernel.max(1)
end
end
|
