a705637dcf
The numbers of the native time unit were so small the CRF was always 1, making it an LRU. This commit switches the time to miliseconds and changes the time delta multiplier to the one yielding mostly highest hit rates according to the paper
122 lines
3.4 KiB
Elixir
122 lines
3.4 KiB
Elixir
defmodule Pleroma.Gun.ConnectionPool.Worker do
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alias Pleroma.Gun
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use GenServer, restart: :temporary
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@registry Pleroma.Gun.ConnectionPool
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def start_link([key | _] = opts) do
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GenServer.start_link(__MODULE__, opts, name: {:via, Registry, {@registry, key}})
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end
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@impl true
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def init([key, uri, opts, client_pid]) do
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with {:ok, conn_pid} <- Gun.Conn.open(uri, opts),
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Process.link(conn_pid) do
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time = :erlang.monotonic_time(:millisecond)
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{_, _} =
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Registry.update_value(@registry, key, fn _ ->
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{conn_pid, [client_pid], 1, time}
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end)
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send(client_pid, {:conn_pid, conn_pid})
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{:ok,
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%{key: key, timer: nil, client_monitors: %{client_pid => Process.monitor(client_pid)}},
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:hibernate}
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else
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err -> {:stop, err}
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end
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end
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@impl true
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def handle_cast({:add_client, client_pid, send_pid_back}, %{key: key} = state) do
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time = :erlang.monotonic_time(:millisecond)
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{{conn_pid, _, _, _}, _} =
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Registry.update_value(@registry, key, fn {conn_pid, used_by, crf, last_reference} ->
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{conn_pid, [client_pid | used_by], crf(time - last_reference, crf), time}
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end)
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if send_pid_back, do: send(client_pid, {:conn_pid, conn_pid})
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state =
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if state.timer != nil do
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Process.cancel_timer(state[:timer])
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%{state | timer: nil}
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else
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state
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end
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ref = Process.monitor(client_pid)
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state = put_in(state.client_monitors[client_pid], ref)
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{:noreply, state, :hibernate}
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end
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@impl true
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def handle_cast({:remove_client, client_pid}, %{key: key} = state) do
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{{_conn_pid, used_by, _crf, _last_reference}, _} =
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Registry.update_value(@registry, key, fn {conn_pid, used_by, crf, last_reference} ->
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{conn_pid, List.delete(used_by, client_pid), crf, last_reference}
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end)
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{ref, state} = pop_in(state.client_monitors[client_pid])
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Process.demonitor(ref)
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timer =
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if used_by == [] do
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max_idle = Pleroma.Config.get([:connections_pool, :max_idle_time], 30_000)
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Process.send_after(self(), :idle_close, max_idle)
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else
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nil
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end
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{:noreply, %{state | timer: timer}, :hibernate}
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end
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@impl true
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def handle_info(:idle_close, state) do
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# Gun monitors the owner process, and will close the connection automatically
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# when it's terminated
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{:stop, :normal, state}
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end
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# Gracefully shutdown if the connection got closed without any streams left
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@impl true
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def handle_info({:gun_down, _pid, _protocol, _reason, []}, state) do
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{:stop, :normal, state}
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end
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# Otherwise, shutdown with an error
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@impl true
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def handle_info({:gun_down, _pid, _protocol, _reason, _killed_streams} = down_message, state) do
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{:stop, {:error, down_message}, state}
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end
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@impl true
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def handle_info({:DOWN, _ref, :process, pid, reason}, state) do
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# Sometimes the client is dead before we demonitor it in :remove_client, so the message
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# arrives anyway
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case state.client_monitors[pid] do
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nil ->
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{:noreply, state, :hibernate}
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_ref ->
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:telemetry.execute(
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[:pleroma, :connection_pool, :client_death],
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%{client_pid: pid, reason: reason},
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%{key: state.key}
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)
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handle_cast({:remove_client, pid}, state)
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end
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end
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# LRFU policy: https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.55.1478
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defp crf(time_delta, prev_crf) do
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1 + :math.pow(0.5, 0.0001 * time_delta) * prev_crf
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end
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end
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