Fix race in enforcer/reclaimer start
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rinpatch
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6a0f2bdf8c
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23d714ed30
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@ -0,0 +1,85 @@
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defmodule Pleroma.Gun.ConnectionPool.Reclaimer do
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use GenServer, restart: :temporary
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@registry Pleroma.Gun.ConnectionPool
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def start_monitor() do
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pid =
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case :gen_server.start(__MODULE__, [], name: {:via, Registry, {@registry, "reclaimer"}}) do
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{:ok, pid} ->
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pid
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{:error, {:already_registered, pid}} ->
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pid
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end
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{pid, Process.monitor(pid)}
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end
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@impl true
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def init(_) do
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{:ok, nil, {:continue, :reclaim}}
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end
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@impl true
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def handle_continue(:reclaim, _) do
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max_connections = Pleroma.Config.get([:connections_pool, :max_connections])
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reclaim_max =
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[:connections_pool, :reclaim_multiplier]
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|> Pleroma.Config.get()
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|> Kernel.*(max_connections)
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|> round
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|> max(1)
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:telemetry.execute([:pleroma, :connection_pool, :reclaim, :start], %{}, %{
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max_connections: max_connections,
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reclaim_max: reclaim_max
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})
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# :ets.fun2ms(
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# fn {_, {worker_pid, {_, used_by, crf, last_reference}}} when used_by == [] ->
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# {worker_pid, crf, last_reference} end)
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unused_conns =
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Registry.select(
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@registry,
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[
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{{:_, :"$1", {:_, :"$2", :"$3", :"$4"}}, [{:==, :"$2", []}], [{{:"$1", :"$3", :"$4"}}]}
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]
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)
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case unused_conns do
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[] ->
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:telemetry.execute(
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[:pleroma, :connection_pool, :reclaim, :stop],
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%{reclaimed_count: 0},
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%{
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max_connections: max_connections
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}
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)
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{:stop, :no_unused_conns, nil}
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unused_conns ->
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reclaimed =
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unused_conns
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|> Enum.sort(fn {_pid1, crf1, last_reference1}, {_pid2, crf2, last_reference2} ->
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crf1 <= crf2 and last_reference1 <= last_reference2
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end)
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|> Enum.take(reclaim_max)
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reclaimed
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|> Enum.each(fn {pid, _, _} ->
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DynamicSupervisor.terminate_child(Pleroma.Gun.ConnectionPool.WorkerSupervisor, pid)
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end)
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:telemetry.execute(
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[:pleroma, :connection_pool, :reclaim, :stop],
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%{reclaimed_count: Enum.count(reclaimed)},
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%{max_connections: max_connections}
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)
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{:stop, :normal, nil}
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end
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end
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end
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@ -29,89 +29,16 @@ defmodule Pleroma.Gun.ConnectionPool.WorkerSupervisor do
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end
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end
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@registry Pleroma.Gun.ConnectionPool
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@enforcer_key "enforcer"
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defp free_pool do
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case Registry.lookup(@registry, @enforcer_key) do
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[] ->
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pid =
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spawn(fn ->
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{:ok, _pid} = Registry.register(@registry, @enforcer_key, nil)
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max_connections = Pleroma.Config.get([:connections_pool, :max_connections])
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reclaim_max =
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[:connections_pool, :reclaim_multiplier]
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|> Pleroma.Config.get()
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|> Kernel.*(max_connections)
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|> round
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|> max(1)
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:telemetry.execute([:pleroma, :connection_pool, :reclaim, :start], %{}, %{
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max_connections: max_connections,
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reclaim_max: reclaim_max
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})
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# :ets.fun2ms(
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# fn {_, {worker_pid, {_, used_by, crf, last_reference}}} when used_by == [] ->
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# {worker_pid, crf, last_reference} end)
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unused_conns =
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Registry.select(
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@registry,
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[
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{{:_, :"$1", {:_, :"$2", :"$3", :"$4"}}, [{:==, :"$2", []}],
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[{{:"$1", :"$3", :"$4"}}]}
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]
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)
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case unused_conns do
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[] ->
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:telemetry.execute(
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[:pleroma, :connection_pool, :reclaim, :stop],
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%{reclaimed_count: 0},
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%{
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max_connections: max_connections
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}
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)
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exit(:no_unused_conns)
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unused_conns ->
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reclaimed =
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unused_conns
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|> Enum.sort(fn {_pid1, crf1, last_reference1},
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{_pid2, crf2, last_reference2} ->
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crf1 <= crf2 and last_reference1 <= last_reference2
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end)
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|> Enum.take(reclaim_max)
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reclaimed
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|> Enum.each(fn {pid, _, _} ->
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DynamicSupervisor.terminate_child(__MODULE__, pid)
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end)
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:telemetry.execute(
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[:pleroma, :connection_pool, :reclaim, :stop],
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%{reclaimed_count: Enum.count(reclaimed)},
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%{max_connections: max_connections}
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)
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end
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end)
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wait_for_enforcer_finish(pid)
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[{pid, _}] ->
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wait_for_enforcer_finish(pid)
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end
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wait_for_reclaimer_finish(Pleroma.Gun.ConnectionPool.Reclaimer.start_monitor())
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end
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defp wait_for_enforcer_finish(pid) do
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ref = Process.monitor(pid)
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defp wait_for_reclaimer_finish({pid, mon}) do
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receive do
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{:DOWN, ^ref, :process, ^pid, :no_unused_conns} ->
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{:DOWN, ^mon, :process, ^pid, :no_unused_conns} ->
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:error
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{:DOWN, ^ref, :process, ^pid, :normal} ->
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{:DOWN, ^mon, :process, ^pid, :normal} ->
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:ok
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end
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end
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