mobilizon/lib/federation/activity_pub/federator.ex

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# Portions of this file are derived from Pleroma:
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/web/federator/federator.ex
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defmodule Mobilizon.Federation.ActivityPub.Federator do
@moduledoc """
Handle federated activities
"""
use GenServer
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Federation.ActivityPub.Actor, as: ActivityPubActor
alias Mobilizon.Federation.ActivityPub.Transmogrifier
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require Logger
@max_jobs 20
@env Application.compile_env(:mobilizon, :env)
@spec init(any()) :: {:ok, any()}
def init(args) do
{:ok, args}
end
@spec start_link(any) :: GenServer.on_start()
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def start_link(_) do
spawn(fn ->
# 1 minute
Process.sleep(1000 * 60)
end)
GenServer.start_link(
__MODULE__,
%{
in: {:sets.new(), []},
out: {:sets.new(), []}
},
name: __MODULE__
)
end
@spec handle(:publish | :publish_single_ap | atom(), Activity.t() | map()) ::
:ok | {:ok, Activity.t()} | Tesla.Env.result() | {:error, String.t()}
def handle(:publish, activity) do
Logger.debug(inspect(activity))
Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end)
with {:ok, %Actor{} = actor} <-
ActivityPubActor.get_or_fetch_actor_by_url(activity.data["actor"]) do
Logger.info(fn -> "Sending #{activity.data["id"]} out via AP" end)
ActivityPub.Publisher.publish(actor, activity)
end
end
def handle(:incoming_ap_doc, params) do
Logger.info("Handling incoming AP activity")
Logger.debug(inspect(Map.drop(params, ["@context"])))
case Transmogrifier.handle_incoming(params) do
{:ok, activity, _data} ->
{:ok, activity}
e ->
# Just drop those for now
Logger.debug("Unhandled activity")
Logger.debug(inspect(e))
Logger.debug(Jason.encode!(params))
end
end
def handle(:publish_single_ap, params) do
ActivityPub.Publisher.publish_one(params)
end
def handle(type, _) do
Logger.debug(fn -> "Unknown task: #{type}" end)
{:error, "Don't know what to do with this"}
end
@spec enqueue(atom(), map(), pos_integer()) :: :ok | {:ok, any()} | {:error, any()}
def enqueue(type, payload, priority \\ 1) do
Logger.debug("enqueue something with type #{inspect(type)}")
if @env == :test do
handle(type, payload)
else
GenServer.cast(__MODULE__, {:enqueue, type, payload, priority})
end
end
@spec maybe_start_job(any(), any()) :: {any(), any()}
def maybe_start_job(running_jobs, queue) do
if :sets.size(running_jobs) < @max_jobs && queue != [] do
{{type, payload}, queue} = queue_pop(queue)
{:ok, pid} = Task.start(fn -> handle(type, payload) end)
mref = Process.monitor(pid)
{:sets.add_element(mref, running_jobs), queue}
else
{running_jobs, queue}
end
end
@spec handle_cast(any(), any()) :: {:noreply, any()}
def handle_cast({:enqueue, type, payload, _priority}, state)
when type in [:incoming_doc, :incoming_ap_doc] do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
i_queue = enqueue_sorted(i_queue, {type, payload}, 1)
{i_running_jobs, i_queue} = maybe_start_job(i_running_jobs, i_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
def handle_cast({:enqueue, type, payload, _priority}, state) do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
o_queue = enqueue_sorted(o_queue, {type, payload}, 1)
{o_running_jobs, o_queue} = maybe_start_job(o_running_jobs, o_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
def handle_cast(m, state) do
Logger.debug(fn ->
"Unknown: #{inspect(m)}, #{inspect(state)}"
end)
{:noreply, state}
end
@spec handle_info({:DOWN, any(), :process, any, any()}, any) :: {:noreply, map()}
def handle_info({:DOWN, ref, :process, _pid, _reason}, state) do
%{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}} = state
i_running_jobs = :sets.del_element(ref, i_running_jobs)
o_running_jobs = :sets.del_element(ref, o_running_jobs)
{i_running_jobs, i_queue} = maybe_start_job(i_running_jobs, i_queue)
{o_running_jobs, o_queue} = maybe_start_job(o_running_jobs, o_queue)
{:noreply, %{in: {i_running_jobs, i_queue}, out: {o_running_jobs, o_queue}}}
end
@spec enqueue_sorted(any(), any(), pos_integer()) :: any()
def enqueue_sorted(queue, element, priority) do
[%{item: element, priority: priority} | queue]
|> Enum.sort_by(fn %{priority: priority} -> priority end)
end
@spec queue_pop(list(any())) :: {any(), list(any())}
def queue_pop([%{item: element} | queue]) do
{element, queue}
end
end