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-rw-r--r--lib/pleroma/web/federator/retry_queue.ex239
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diff --git a/lib/pleroma/web/federator/retry_queue.ex b/lib/pleroma/web/federator/retry_queue.ex
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--- a/lib/pleroma/web/federator/retry_queue.ex
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-# 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 Pleroma.Config.get(: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
- |> Enum.each(fn e ->
- :ets.delete_object(table, e)
- 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 Pleroma.Config.get(: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