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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Gun.ConnectionPool.WorkerSupervisor do
@moduledoc "Supervisor for pool workers. Does not do anything except enforce max connection limit"
use DynamicSupervisor
def start_link(opts) do
DynamicSupervisor.start_link(__MODULE__, opts, name: __MODULE__)
end
def init(_opts) do
DynamicSupervisor.init(
strategy: :one_for_one,
max_children: Pleroma.Config.get([:connections_pool, :max_connections])
)
end
def start_worker(opts, retry \\ false) do
case DynamicSupervisor.start_child(__MODULE__, {Pleroma.Gun.ConnectionPool.Worker, opts}) do
{:error, :max_children} ->
if retry or free_pool() == :error do
:telemetry.execute([:pleroma, :connection_pool, :provision_failure], %{opts: opts})
{:error, :pool_full}
else
start_worker(opts, true)
end
res ->
res
end
end
defp free_pool do
wait_for_reclaimer_finish(Pleroma.Gun.ConnectionPool.Reclaimer.start_monitor())
end
defp wait_for_reclaimer_finish({pid, mon}) do
receive do
{:DOWN, ^mon, :process, ^pid, :no_unused_conns} ->
:error
{:DOWN, ^mon, :process, ^pid, :normal} ->
:ok
end
end
end
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