118 lines
3.5 KiB
Elixir
118 lines
3.5 KiB
Elixir
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
|
|
|
|
@registry Pleroma.Gun.ConnectionPool
|
|
@enforcer_key "enforcer"
|
|
defp free_pool do
|
|
case Registry.lookup(@registry, @enforcer_key) do
|
|
[] ->
|
|
pid =
|
|
spawn(fn ->
|
|
{:ok, _pid} = Registry.register(@registry, @enforcer_key, nil)
|
|
max_connections = Pleroma.Config.get([:connections_pool, :max_connections])
|
|
|
|
reclaim_max =
|
|
[:connections_pool, :reclaim_multiplier]
|
|
|> Pleroma.Config.get()
|
|
|> Kernel.*(max_connections)
|
|
|> round
|
|
|> max(1)
|
|
|
|
:telemetry.execute([:pleroma, :connection_pool, :reclaim, :start], %{}, %{
|
|
max_connections: max_connections,
|
|
reclaim_max: reclaim_max
|
|
})
|
|
|
|
# :ets.fun2ms(
|
|
# fn {_, {worker_pid, {_, used_by, crf, last_reference}}} when used_by == [] ->
|
|
# {worker_pid, crf, last_reference} end)
|
|
unused_conns =
|
|
Registry.select(
|
|
@registry,
|
|
[
|
|
{{:_, :"$1", {:_, :"$2", :"$3", :"$4"}}, [{:==, :"$2", []}],
|
|
[{{:"$1", :"$3", :"$4"}}]}
|
|
]
|
|
)
|
|
|
|
case unused_conns do
|
|
[] ->
|
|
:telemetry.execute(
|
|
[:pleroma, :connection_pool, :reclaim, :stop],
|
|
%{reclaimed_count: 0},
|
|
%{
|
|
max_connections: max_connections
|
|
}
|
|
)
|
|
|
|
exit(:no_unused_conns)
|
|
|
|
unused_conns ->
|
|
reclaimed =
|
|
unused_conns
|
|
|> Enum.sort(fn {_pid1, crf1, last_reference1},
|
|
{_pid2, crf2, last_reference2} ->
|
|
crf1 <= crf2 and last_reference1 <= last_reference2
|
|
end)
|
|
|> Enum.take(reclaim_max)
|
|
|
|
reclaimed
|
|
|> Enum.each(fn {pid, _, _} ->
|
|
DynamicSupervisor.terminate_child(__MODULE__, pid)
|
|
end)
|
|
|
|
:telemetry.execute(
|
|
[:pleroma, :connection_pool, :reclaim, :stop],
|
|
%{reclaimed_count: Enum.count(reclaimed)},
|
|
%{max_connections: max_connections}
|
|
)
|
|
end
|
|
end)
|
|
|
|
wait_for_enforcer_finish(pid)
|
|
|
|
[{pid, _}] ->
|
|
wait_for_enforcer_finish(pid)
|
|
end
|
|
end
|
|
|
|
defp wait_for_enforcer_finish(pid) do
|
|
ref = Process.monitor(pid)
|
|
|
|
receive do
|
|
{:DOWN, ^ref, :process, ^pid, :no_unused_conns} ->
|
|
:error
|
|
|
|
{:DOWN, ^ref, :process, ^pid, :normal} ->
|
|
:ok
|
|
end
|
|
end
|
|
end
|