mobilizon/lib/service/federator.ex

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Elixir
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defmodule Eventos.Service.Federator do
@moduledoc """
Handle federated activities
"""
use GenServer
alias Eventos.Actors
alias Eventos.Activity
alias Eventos.Service.ActivityPub
alias Eventos.Service.ActivityPub.Transmogrifier
require Logger
@max_jobs 20
def init(args) do
{:ok, args}
end
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
def handle(:publish, activity) do
Logger.debug(inspect activity)
Logger.debug(fn -> "Running publish for #{activity.data["id"]}" end)
with actor when not is_nil(actor) <- Actors.get_actor_by_url(activity.data["actor"]) do
Logger.info(fn -> "Sending #{activity.data["id"]} out via AP" end)
ActivityPub.publish(actor, activity)
end
end
def handle(:incoming_ap_doc, params) do
Logger.info("Handling incoming AP activity")
Logger.debug(inspect params)
with {: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(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
Logger.debug("enqueue")
if Mix.env() == :test do
handle(type, payload)
else
GenServer.cast(__MODULE__, {:enqueue, type, payload, priority})
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
Logger.error fn ->
"Unknown: #{inspect(m)}, #{inspect(state)}"
end
{: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
end