323 lines
8.3 KiB
Elixir
323 lines
8.3 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Pool.Connections do
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use GenServer
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alias Pleroma.Config
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require Logger
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@type domain :: String.t()
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@type conn :: Pleroma.Gun.Conn.t()
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@type t :: %__MODULE__{
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conns: %{domain() => conn()},
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opts: keyword()
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}
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defstruct conns: %{}, opts: []
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alias Pleroma.Gun.API
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@spec start_link({atom(), keyword()}) :: {:ok, pid()}
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def start_link({name, opts}) do
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GenServer.start_link(__MODULE__, opts, name: name)
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end
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@impl true
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def init(opts), do: {:ok, %__MODULE__{conns: %{}, opts: opts}}
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@spec checkin(String.t() | URI.t(), atom()) :: pid() | nil
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def checkin(url, name)
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def checkin(url, name) when is_binary(url), do: checkin(URI.parse(url), name)
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def checkin(%URI{} = uri, name) do
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timeout = Config.get([:connections_pool, :receive_connection_timeout], 250)
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GenServer.call(
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name,
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{:checkin, uri},
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timeout
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)
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end
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@spec alive?(atom()) :: boolean()
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def alive?(name) do
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pid = Process.whereis(name)
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if pid, do: Process.alive?(pid), else: false
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end
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@spec get_state(atom()) :: t()
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def get_state(name) do
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GenServer.call(name, :state)
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end
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@spec count(atom()) :: pos_integer()
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def count(name) do
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GenServer.call(name, :count)
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end
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@spec get_unused_conns(atom()) :: [{domain(), conn()}]
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def get_unused_conns(name) do
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GenServer.call(name, :unused_conns)
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end
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@spec checkout(pid(), pid(), atom()) :: :ok
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def checkout(conn, pid, name) do
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GenServer.cast(name, {:checkout, conn, pid})
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end
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@spec add_conn(atom(), String.t(), Pleroma.Gun.Conn.t()) :: :ok
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def add_conn(name, key, conn) do
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GenServer.cast(name, {:add_conn, key, conn})
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end
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@spec remove_conn(atom(), String.t()) :: :ok
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def remove_conn(name, key) do
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GenServer.cast(name, {:remove_conn, key})
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end
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@impl true
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def handle_cast({:add_conn, key, conn}, state) do
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state = put_in(state.conns[key], conn)
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Process.monitor(conn.conn)
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{:noreply, state}
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end
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@impl true
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def handle_cast({:checkout, conn_pid, pid}, state) do
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Logger.debug("checkout #{inspect(conn_pid)}")
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state =
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with true <- Process.alive?(conn_pid),
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{key, conn} <- find_conn(state.conns, conn_pid),
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used_by <- List.keydelete(conn.used_by, pid, 0) do
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conn_state =
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if used_by == [] do
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:idle
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else
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conn.conn_state
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end
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put_in(state.conns[key], %{conn | conn_state: conn_state, used_by: used_by})
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else
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false ->
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Logger.debug("checkout for closed conn #{inspect(conn_pid)}")
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state
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nil ->
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Logger.debug("checkout for alive conn #{inspect(conn_pid)}, but is not in state")
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state
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end
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{:noreply, state}
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end
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@impl true
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def handle_cast({:remove_conn, key}, state) do
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state = put_in(state.conns, Map.delete(state.conns, key))
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{:noreply, state}
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end
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@impl true
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def handle_call({:checkin, uri}, from, state) do
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key = "#{uri.scheme}:#{uri.host}:#{uri.port}"
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Logger.debug("checkin #{key}")
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case state.conns[key] do
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%{conn: conn, gun_state: :up} = current_conn ->
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Logger.debug("reusing conn #{key}")
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with time <- :os.system_time(:second),
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last_reference <- time - current_conn.last_reference,
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current_crf <- crf(last_reference, 100, current_conn.crf),
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state <-
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put_in(state.conns[key], %{
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current_conn
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| last_reference: time,
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crf: current_crf,
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conn_state: :active,
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used_by: [from | current_conn.used_by]
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}) do
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{:reply, conn, state}
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end
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%{gun_state: :down} ->
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{:reply, nil, state}
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nil ->
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{:reply, nil, state}
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end
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end
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@impl true
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def handle_call(:state, _from, state), do: {:reply, state, state}
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@impl true
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def handle_call(:count, _from, state) do
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{:reply, Enum.count(state.conns), state}
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end
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@impl true
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def handle_call(:unused_conns, _from, state) do
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unused_conns =
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state.conns
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|> Enum.filter(fn {_k, v} ->
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v.conn_state == :idle and v.used_by == []
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end)
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|> Enum.sort(fn {_x_k, x}, {_y_k, y} ->
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x.crf <= y.crf and x.last_reference <= y.last_reference
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end)
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{:reply, unused_conns, state}
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end
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@impl true
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def handle_info({:gun_up, conn_pid, _protocol}, state) do
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state =
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with conn_key when is_binary(conn_key) <- compose_key_gun_info(conn_pid),
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{key, conn} <- find_conn(state.conns, conn_pid, conn_key),
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{true, key} <- {Process.alive?(conn_pid), key},
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time <- :os.system_time(:second),
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last_reference <- time - conn.last_reference,
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current_crf <- crf(last_reference, 100, conn.crf) do
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put_in(state.conns[key], %{
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conn
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| gun_state: :up,
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last_reference: time,
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crf: current_crf,
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conn_state: :active,
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retries: 0
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})
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else
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:error_gun_info ->
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Logger.debug(":gun.info caused error")
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state
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{false, key} ->
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Logger.debug(":gun_up message for closed conn #{inspect(conn_pid)}")
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put_in(
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state.conns,
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Map.delete(state.conns, key)
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)
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nil ->
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Logger.debug(":gun_up message for conn which is not found in state")
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:ok = API.close(conn_pid)
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state
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end
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{:noreply, state}
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end
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@impl true
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def handle_info({:gun_down, conn_pid, _protocol, _reason, _killed}, state) do
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retries = Config.get([:connections_pool, :retry], 0)
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# we can't get info on this pid, because pid is dead
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state =
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with {key, conn} <- find_conn(state.conns, conn_pid),
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{true, key} <- {Process.alive?(conn_pid), key} do
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if conn.retries == retries do
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Logger.debug("closing conn if retries is eq #{inspect(conn_pid)}")
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:ok = API.close(conn.conn)
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put_in(
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state.conns,
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Map.delete(state.conns, key)
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)
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else
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put_in(state.conns[key], %{
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conn
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| gun_state: :down,
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retries: conn.retries + 1
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})
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end
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else
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{false, key} ->
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# gun can send gun_down for closed conn, maybe connection is not closed yet
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Logger.debug(":gun_down message for closed conn #{inspect(conn_pid)}")
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put_in(
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state.conns,
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Map.delete(state.conns, key)
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)
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nil ->
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Logger.debug(":gun_down message for conn which is not found in state")
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:ok = API.close(conn_pid)
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state
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end
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{:noreply, state}
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end
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@impl true
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def handle_info({:DOWN, _ref, :process, conn_pid, reason}, state) do
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Logger.debug("received DOWM message for #{inspect(conn_pid)} reason -> #{inspect(reason)}")
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state =
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with {key, conn} <- find_conn(state.conns, conn_pid) do
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Enum.each(conn.used_by, fn {pid, _ref} ->
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Process.exit(pid, reason)
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end)
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put_in(
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state.conns,
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Map.delete(state.conns, key)
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)
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else
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nil ->
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Logger.debug(":DOWN message for conn which is not found in state")
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state
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end
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{:noreply, state}
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end
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defp compose_key_gun_info(pid) do
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try do
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# sometimes :gun.info can raise MatchError, which lead to pool terminate
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%{origin_host: origin_host, origin_scheme: scheme, origin_port: port} = API.info(pid)
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host =
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case :inet.ntoa(origin_host) do
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{:error, :einval} -> origin_host
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ip -> ip
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end
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"#{scheme}:#{host}:#{port}"
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rescue
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_ -> :error_gun_info
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end
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end
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defp find_conn(conns, conn_pid) do
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Enum.find(conns, fn {_key, conn} ->
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conn.conn == conn_pid
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end)
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end
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defp find_conn(conns, conn_pid, conn_key) do
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Enum.find(conns, fn {key, conn} ->
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key == conn_key and conn.conn == conn_pid
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end)
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end
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def crf(current, steps, crf) do
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1 + :math.pow(0.5, current / steps) * crf
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end
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def compose_uri_log(%URI{scheme: scheme, host: host, path: path}) do
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"#{scheme}://#{host}#{path}"
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end
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end
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