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