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diff --git a/lib/pleroma/web/federator/retry_queue.ex b/lib/pleroma/web/federator/retry_queue.ex
index 230a2c939..e0ce251d2 100644
--- a/lib/pleroma/web/federator/retry_queue.ex
+++ b/lib/pleroma/web/federator/retry_queue.ex
@@ -1,238 +1,237 @@
# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Federator.RetryQueue do
use GenServer
require Logger
def init(args) do
queue_table = :ets.new(:pleroma_retry_queue, [:bag, :protected])
{:ok, %{args | queue_table: queue_table, running_jobs: :sets.new()}}
end
def start_link() do
enabled =
if Mix.env() == :test, do: true, else: Pleroma.Config.get([__MODULE__, :enabled], false)
if enabled do
Logger.info("Starting retry queue")
linkres =
GenServer.start_link(
__MODULE__,
%{delivered: 0, dropped: 0, queue_table: nil, running_jobs: nil},
name: __MODULE__
)
maybe_kickoff_timer()
linkres
else
Logger.info("Retry queue disabled")
:ignore
end
end
def enqueue(data, transport, retries \\ 0) do
GenServer.cast(__MODULE__, {:maybe_enqueue, data, transport, retries + 1})
end
def get_stats() do
GenServer.call(__MODULE__, :get_stats)
end
def reset_stats() do
GenServer.call(__MODULE__, :reset_stats)
end
def get_retry_params(retries) do
if retries > Pleroma.Config.get([__MODULE__, :max_retries]) do
{:drop, "Max retries reached"}
else
{:retry, growth_function(retries)}
end
end
def get_retry_timer_interval() do
Pleroma.Config.get([:retry_queue, :interval], 1000)
end
defp ets_count_expires(table, current_time) do
:ets.select_count(
table,
[
{
{:"$1", :"$2"},
[{:"=<", :"$1", {:const, current_time}}],
[true]
}
]
)
end
defp ets_pop_n_expired(table, current_time, desired) do
{popped, _continuation} =
:ets.select(
table,
[
{
{:"$1", :"$2"},
[{:"=<", :"$1", {:const, current_time}}],
[:"$_"]
}
],
desired
)
popped
- |> List.foldl(true, fn e, acc ->
+ |> Enum.each(fn e ->
:ets.delete_object(table, e)
- acc
end)
popped
end
def maybe_start_job(running_jobs, queue_table) do
# we don't want to hit the ets or the DateTime more times than we have to
# could optimize slightly further by not using the count, and instead grabbing
# up to N objects early...
current_time = DateTime.to_unix(DateTime.utc_now())
n_running_jobs = :sets.size(running_jobs)
if n_running_jobs < Pleroma.Config.get([__MODULE__, :max_jobs]) do
n_ready_jobs = ets_count_expires(queue_table, current_time)
if n_ready_jobs > 0 do
# figure out how many we could start
available_job_slots = Pleroma.Config.get([__MODULE__, :max_jobs]) - n_running_jobs
start_n_jobs(running_jobs, queue_table, current_time, available_job_slots)
else
running_jobs
end
else
running_jobs
end
end
defp start_n_jobs(running_jobs, _queue_table, _current_time, 0) do
running_jobs
end
defp start_n_jobs(running_jobs, queue_table, current_time, available_job_slots)
when available_job_slots > 0 do
candidates = ets_pop_n_expired(queue_table, current_time, available_job_slots)
candidates
|> List.foldl(running_jobs, fn {_, e}, rj ->
{:ok, pid} = Task.start(fn -> worker(e) end)
mref = Process.monitor(pid)
:sets.add_element(mref, rj)
end)
end
def worker({:send, data, transport, retries}) do
case transport.publish_one(data) do
{:ok, _} ->
GenServer.cast(__MODULE__, :inc_delivered)
:delivered
{:error, _reason} ->
enqueue(data, transport, retries)
:retry
end
end
def handle_call(:get_stats, _from, %{delivered: delivery_count, dropped: drop_count} = state) do
{:reply, %{delivered: delivery_count, dropped: drop_count}, state}
end
def handle_call(:reset_stats, _from, %{delivered: delivery_count, dropped: drop_count} = state) do
{:reply, %{delivered: delivery_count, dropped: drop_count},
%{state | delivered: 0, dropped: 0}}
end
def handle_cast(:reset_stats, state) do
{:noreply, %{state | delivered: 0, dropped: 0}}
end
def handle_cast(
{:maybe_enqueue, data, transport, retries},
%{dropped: drop_count, queue_table: queue_table, running_jobs: running_jobs} = state
) do
case get_retry_params(retries) do
{:retry, timeout} ->
:ets.insert(queue_table, {timeout, {:send, data, transport, retries}})
running_jobs = maybe_start_job(running_jobs, queue_table)
{:noreply, %{state | running_jobs: running_jobs}}
{:drop, message} ->
Logger.debug(message)
{:noreply, %{state | dropped: drop_count + 1}}
end
end
def handle_cast(:kickoff_timer, state) do
retry_interval = get_retry_timer_interval()
Process.send_after(__MODULE__, :retry_timer_run, retry_interval)
{:noreply, state}
end
def handle_cast(:inc_delivered, %{delivered: delivery_count} = state) do
{:noreply, %{state | delivered: delivery_count + 1}}
end
def handle_cast(:inc_dropped, %{dropped: drop_count} = state) do
{:noreply, %{state | dropped: drop_count + 1}}
end
def handle_info({:send, data, transport, retries}, %{delivered: delivery_count} = state) do
case transport.publish_one(data) do
{:ok, _} ->
{:noreply, %{state | delivered: delivery_count + 1}}
{:error, _reason} ->
enqueue(data, transport, retries)
{:noreply, state}
end
end
def handle_info(
:retry_timer_run,
%{queue_table: queue_table, running_jobs: running_jobs} = state
) do
maybe_kickoff_timer()
running_jobs = maybe_start_job(running_jobs, queue_table)
{:noreply, %{state | running_jobs: running_jobs}}
end
def handle_info({:DOWN, ref, :process, _pid, _reason}, state) do
%{running_jobs: running_jobs, queue_table: queue_table} = state
running_jobs = :sets.del_element(ref, running_jobs)
running_jobs = maybe_start_job(running_jobs, queue_table)
{:noreply, %{state | running_jobs: running_jobs}}
end
def handle_info(unknown, state) do
Logger.debug("RetryQueue: don't know what to do with #{inspect(unknown)}, ignoring")
{:noreply, state}
end
if Mix.env() == :test do
defp growth_function(_retries) do
_shutit = Pleroma.Config.get([__MODULE__, :initial_timeout])
DateTime.to_unix(DateTime.utc_now()) - 1
end
else
defp growth_function(retries) do
round(Pleroma.Config.get([__MODULE__, :initial_timeout]) * :math.pow(retries, 3)) +
DateTime.to_unix(DateTime.utc_now())
end
end
defp maybe_kickoff_timer() do
GenServer.cast(__MODULE__, :kickoff_timer)
end
end

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