federator.ex
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federator.ex
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	defmodule Pleroma.Web.Federator do
	use GenServer
	alias Pleroma.User
	alias Pleroma.Activity
	alias Pleroma.Web.{WebFinger, Websub}
	alias Pleroma.Web.ActivityPub.ActivityPub
	alias Pleroma.Web.ActivityPub.Transmogrifier
	require Logger

	@websub Application.get_env(:pleroma, :websub)
	@ostatus Application.get_env(:pleroma, :ostatus)
	@httpoison Application.get_env(:pleroma, :httpoison)
	@instance Application.get_env(:pleroma, :instance)
	@federating Keyword.get(@instance, :federating)
	@max_jobs 20

	def start_link do
	spawn(fn ->
	Process.sleep(1000 * 60 * 1) # 1 minute
	enqueue(:refresh_subscriptions, nil)
	end)
	GenServer.start_link(__MODULE__, %{
	in: {:sets.new(), []},
	out: {:sets.new(), []}
	}, name: __MODULE__)
	end

	def handle(:refresh_subscriptions, _) do
	Logger.debug("Federator running refresh subscriptions")
	Websub.refresh_subscriptions()
	spawn(fn ->
	Process.sleep(1000 * 60 * 60 * 6) # 6 hours
	enqueue(:refresh_subscriptions, nil)
	end)
	end

	def handle(:request_subscription, websub) do
	Logger.debug("Refreshing #{websub.topic}")
	with {:ok, websub } <- Websub.request_subscription(websub) do
	Logger.debug("Successfully refreshed #{websub.topic}")
	else
	_e -> Logger.debug("Couldn't refresh #{websub.topic}")
	end
	end

	def handle(:publish, activity) do
	Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end)
	with actor when not is_nil(actor) <- User.get_cached_by_ap_id(activity.data["actor"]) do
	{:ok, actor} = WebFinger.ensure_keys_present(actor)
	if ActivityPub.is_public?(activity) do
	Logger.info(fn -> "Sending #{activity.data["id"]} out via WebSub" end)
	Websub.publish(Pleroma.Web.OStatus.feed_path(actor), actor, activity)

	Logger.info(fn -> "Sending #{activity.data["id"]} out via Salmon" end)
	Pleroma.Web.Salmon.publish(actor, activity)
	end

	Logger.info(fn -> "Sending #{activity.data["id"]} out via AP" end)
	Pleroma.Web.ActivityPub.ActivityPub.publish(actor, activity)
	end
	end

	def handle(:verify_websub, websub) do
	Logger.debug(fn -> "Running WebSub verification for #{websub.id} (#{websub.topic}, #{websub.callback})" end)
	@websub.verify(websub)
	end

	def handle(:incoming_doc, doc) do
	Logger.info("Got document, trying to parse")
	@ostatus.handle_incoming(doc)
	end

	def handle(:incoming_ap_doc, params) do
	Logger.info("Handling incoming AP activity")
	with {:ok, _user} <- ap_enabled_actor(params["actor"]),
	nil <- Activity.get_by_ap_id(params["id"]),
	{:ok, activity} <- Transmogrifier.handle_incoming(params) do
	else
	%Activity{} ->
	Logger.info("Already had #{params["id"]}")
	e ->
	# Just drop those for now
	Logger.info("Unhandled activity")
	Logger.info(Poison.encode!(params, [pretty: 2]))
	end
	end

	def handle(:publish_single_ap, params) do
	ActivityPub.publish_one(params)
	end

	def handle(:publish_single_websub, %{xml: xml, topic: topic, callback: callback, secret: secret}) do
	signature = @websub.sign(secret \|\| "", xml)
	Logger.debug(fn -> "Pushing #{topic} to #{callback}" end)

	with {:ok, %{status_code: code}} <- @httpoison.post(callback, xml, [
	{"Content-Type", "application/atom+xml"},
	{"X-Hub-Signature", "sha1=#{signature}"}
	], timeout: 10000, recv_timeout: 20000) do
	Logger.debug(fn -> "Pushed to #{callback}, code #{code}" end)
	else e ->
	Logger.debug(fn -> "Couldn't push to #{callback}, #{inspect(e)}" end)
	end
	end

	def handle(type, _) do
	Logger.debug(fn -> "Unknown task: #{type}" end)
	{:error, "Don't know what to do with this"}
	end

	def enqueue(type, payload, priority \\ 1) do
	if @federating do
	if Mix.env == :test do
	handle(type, payload)
	else
	GenServer.cast(__MODULE__, {:enqueue, type, payload, priority})
	end
	end
	end

	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

	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
	IO.inspect("Unknown: #{inspect(m)}, #{inspect(state)}")
	{:noreply, state}
	end

	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

	def enqueue_sorted(queue, element, priority) do
	[%{item: element, priority: priority} \| queue]
	\|> Enum.sort_by(fn (%{priority: priority}) -> priority end)
	end

	def queue_pop([%{item: element} \| queue]) do
	{element, queue}
	end

	def ap_enabled_actor(id) do
	user = User.get_by_ap_id(id)
	if User.ap_enabled?(user) do
	{:ok, user}
	else
	ActivityPub.make_user_from_ap_id(id)
	end
	end
	end

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