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diff --git a/lib/pleroma/pool/connections.ex b/lib/pleroma/pool/connections.ex
index b4699edf7..b9618d3c7 100644
--- a/lib/pleroma/pool/connections.ex
+++ b/lib/pleroma/pool/connections.ex
@@ -1,320 +1,322 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Pool.Connections do
use GenServer
alias Pleroma.Config
alias Pleroma.Gun
require Logger
@type domain :: String.t()
@type conn :: Pleroma.Gun.Conn.t()
@type seconds :: pos_integer()
@type t :: %__MODULE__{
conns: %{domain() => conn()},
opts: keyword()
}
defstruct conns: %{}, opts: []
@spec start_link({atom(), keyword()}) :: {:ok, pid()}
def start_link({name, opts}) do
GenServer.start_link(__MODULE__, opts, name: name)
end
@impl true
def init(opts) do
schedule_close_idle_conns()
{:ok, %__MODULE__{conns: %{}, opts: opts}}
end
@spec checkin(String.t() | URI.t(), atom()) :: pid() | nil
def checkin(url, name)
def checkin(url, name) when is_binary(url), do: checkin(URI.parse(url), name)
def checkin(%URI{} = uri, name) do
timeout = Config.get([:connections_pool, :checkin_timeout], 250)
GenServer.call(name, {:checkin, uri}, timeout)
end
@spec alive?(atom()) :: boolean()
def alive?(name) do
if pid = Process.whereis(name) do
Process.alive?(pid)
else
false
end
end
@spec get_state(atom()) :: t()
def get_state(name) do
GenServer.call(name, :state)
end
@spec count(atom()) :: pos_integer()
def count(name) do
GenServer.call(name, :count)
end
@spec get_unused_conns(atom()) :: [{domain(), conn()}]
def get_unused_conns(name) do
GenServer.call(name, :unused_conns)
end
@spec checkout(pid(), pid(), atom()) :: :ok
def checkout(conn, pid, name) do
GenServer.cast(name, {:checkout, conn, pid})
end
@spec add_conn(atom(), String.t(), Pleroma.Gun.Conn.t()) :: :ok
def add_conn(name, key, conn) do
GenServer.cast(name, {:add_conn, key, conn})
end
@spec remove_conn(atom(), String.t()) :: :ok
def remove_conn(name, key) do
GenServer.cast(name, {:remove_conn, key})
end
@impl true
def handle_cast({:add_conn, key, conn}, state) do
state = put_in(state.conns[key], conn)
Process.monitor(conn.conn)
{:noreply, state}
end
@impl true
def handle_cast({:checkout, conn_pid, pid}, state) do
state =
with true <- Process.alive?(conn_pid),
{key, conn} <- find_conn(state.conns, conn_pid),
used_by <- List.keydelete(conn.used_by, pid, 0) do
- conn_state = if used_by == [], do: :idle, else: conn.conn_state
+ conn_state = if used_by == [], do: :idle, else: :active
put_in(state.conns[key], %{conn | conn_state: conn_state, used_by: used_by})
else
false ->
Logger.debug("checkout for closed conn #{inspect(conn_pid)}")
state
nil ->
Logger.debug("checkout for alive conn #{inspect(conn_pid)}, but is not in state")
state
end
{:noreply, state}
end
@impl true
def handle_cast({:remove_conn, key}, state) do
state = put_in(state.conns, Map.delete(state.conns, key))
{:noreply, state}
end
@impl true
def handle_call({:checkin, uri}, from, state) do
key = "#{uri.scheme}:#{uri.host}:#{uri.port}"
case state.conns[key] do
%{conn: pid, gun_state: :up} = conn ->
time = :os.system_time(:second)
last_reference = time - conn.last_reference
crf = crf(last_reference, 100, conn.crf)
state =
put_in(state.conns[key], %{
conn
| last_reference: time,
crf: crf,
conn_state: :active,
used_by: [from | conn.used_by]
})
{:reply, pid, state}
%{gun_state: :down} ->
{:reply, nil, state}
nil ->
{:reply, nil, state}
end
end
@impl true
def handle_call(:state, _from, state), do: {:reply, state, state}
@impl true
def handle_call(:count, _from, state) do
{:reply, Enum.count(state.conns), state}
end
@impl true
def handle_call(:unused_conns, _from, state) do
unused_conns =
state.conns
|> Enum.filter(&idle_conn?/1)
|> Enum.sort(&least_used/2)
{:reply, unused_conns, state}
end
defp idle_conn?({_, %{conn_state: :idle}}), do: true
defp idle_conn?(_), do: false
defp least_used({_, c1}, {_, c2}) do
c1.crf <= c2.crf and c1.last_reference <= c2.last_reference
end
@impl true
def handle_info({:gun_up, conn_pid, _protocol}, state) do
%{origin_host: host, origin_scheme: scheme, origin_port: port} = Gun.info(conn_pid)
host =
case :inet.ntoa(host) do
{:error, :einval} -> host
ip -> ip
end
key = "#{scheme}:#{host}:#{port}"
state =
with {key, conn} <- find_conn(state.conns, conn_pid, key),
{true, key} <- {Process.alive?(conn_pid), key} do
+ conn_state = if conn.used_by == [], do: :idle, else: :active
+
put_in(state.conns[key], %{
conn
| gun_state: :up,
- conn_state: :active,
+ conn_state: conn_state,
retries: 0
})
else
{false, key} ->
put_in(
state.conns,
Map.delete(state.conns, key)
)
nil ->
:ok = Gun.close(conn_pid)
state
end
{:noreply, state}
end
@impl true
def handle_info({:gun_down, conn_pid, _protocol, _reason, _killed}, state) do
retries = Config.get([:connections_pool, :retry], 1)
# we can't get info on this pid, because pid is dead
state =
with {key, conn} <- find_conn(state.conns, conn_pid),
{true, key} <- {Process.alive?(conn_pid), key} do
if conn.retries == retries do
:ok = Gun.close(conn.conn)
put_in(
state.conns,
Map.delete(state.conns, key)
)
else
put_in(state.conns[key], %{
conn
| gun_state: :down,
conn_state: :idle,
retries: conn.retries + 1
})
end
else
{false, key} ->
put_in(
state.conns,
Map.delete(state.conns, key)
)
nil ->
Logger.debug(":gun_down for conn which isn't found in state")
state
end
{:noreply, state}
end
@impl true
def handle_info({:DOWN, _ref, :process, conn_pid, reason}, state) do
Logger.debug("received DOWN message for #{inspect(conn_pid)} reason -> #{inspect(reason)}")
state =
with {key, conn} <- find_conn(state.conns, conn_pid) do
Enum.each(conn.used_by, fn {pid, _ref} ->
Process.exit(pid, reason)
end)
put_in(
state.conns,
Map.delete(state.conns, key)
)
else
nil ->
Logger.debug(":DOWN for conn which isn't found in state")
state
end
{:noreply, state}
end
@impl true
def handle_info({:close_idle_conns, max_idle_time}, state) do
closing_time = :os.system_time(:second) - max_idle_time
idle_conns_keys =
state.conns
|> Enum.filter(&idle_more_than?(&1, closing_time))
|> Enum.map(fn {key, %{conn: conn}} ->
Gun.close(conn)
key
end)
schedule_close_idle_conns()
{:noreply, put_in(state.conns, Map.drop(state.conns, idle_conns_keys))}
end
defp schedule_close_idle_conns do
max_idle_time = Config.get([:connections_pool, :max_idle_time], 10) * 60
interval = Config.get([:connections_pool, :closing_idle_conns_interval], 10) * 60 * 1000
Process.send_after(self(), {:close_idle_conns, max_idle_time}, interval)
end
defp idle_more_than?(
{_, %{conn_state: :idle, last_reference: idle_since}},
closing_time
)
when closing_time >= idle_since do
true
end
defp idle_more_than?(_, _), do: false
defp find_conn(conns, conn_pid) do
Enum.find(conns, fn {_key, conn} ->
conn.conn == conn_pid
end)
end
defp find_conn(conns, conn_pid, conn_key) do
Enum.find(conns, fn {key, conn} ->
key == conn_key and conn.conn == conn_pid
end)
end
def crf(current, steps, crf) do
1 + :math.pow(0.5, current / steps) * crf
end
end

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