mobilizon/lib/mobilizon.ex

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Elixir
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defmodule Mobilizon do
@moduledoc """
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Mobilizon is a decentralized and federated Meetup-like using
[ActivityPub](http://activitypub.rocks/).
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It consists of an API server build with [Elixir](http://elixir-lang.github.io/)
and the [Phoenix Framework](https://hexdocs.pm/phoenix).
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Mobilizon relies on `Guardian` for auth and `Geo`/Postgis for geographical
information.
"""
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use Application
import Cachex.Spec
alias Mobilizon.{Config, Storage, Web}
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alias Mobilizon.Federation.ActivityPub
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alias Mobilizon.Service.Export.{Feed, ICalendar}
@name Mix.Project.config()[:name]
@version Mix.Project.config()[:version]
@spec named_version :: String.t()
def named_version, do: "#{@name} #{@version}"
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@spec user_agent :: String.t()
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def user_agent do
info = "#{Web.Endpoint.url()} <#{Config.get([:instance, :email], "")}>"
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"#{named_version()}; #{info}"
end
@spec start(:normal | {:takeover, node} | {:failover, node}, term) ::
{:ok, pid} | {:ok, pid, term} | {:error, term}
def start(_type, _args) do
children = [
# supervisors
Storage.Repo,
Web.Endpoint,
{Absinthe.Subscription, [Web.Endpoint]},
{Oban, Application.get_env(:mobilizon, Oban)},
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# workers
Guardian.DB.Token.SweeperServer,
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ActivityPub.Federator,
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cachex_spec(:feed, 2500, 60, 60, &Feed.create_cache/1),
cachex_spec(:ics, 2500, 60, 60, &ICalendar.create_cache/1),
cachex_spec(:statistics, 10, 60, 60),
cachex_spec(:activity_pub, 2500, 3, 15),
internal_actor()
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]
Supervisor.start_link(children, strategy: :one_for_one, name: Mobilizon.Supervisor)
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end
@spec config_change(keyword, keyword, [atom]) :: :ok
def config_change(changed, _new, removed) do
Web.Endpoint.config_change(changed, removed)
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:ok
end
@spec cachex_spec(atom, integer, integer, integer, function | nil) :: Supervisor.child_spec()
defp cachex_spec(name, limit, default, interval, fallback \\ nil) do
%{
id: :"cache_#{name}",
start:
{Cachex, :start_link,
[
name,
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Keyword.merge(
cachex_options(limit, default, interval),
fallback_options(fallback)
)
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]}
}
end
@spec cachex_options(integer, integer, integer) :: keyword
defp cachex_options(limit, default, interval) do
[
limit: limit,
expiration:
expiration(
default: :timer.minutes(default),
interval: :timer.seconds(interval)
)
]
end
@spec fallback_options(function | nil) :: keyword
defp fallback_options(nil), do: []
defp fallback_options(fallback), do: [fallback: fallback(default: fallback)]
defp internal_actor() do
%{
id: :internal_actor_init,
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start: {Task, :start_link, [&ActivityPub.Relay.init/0]},
restart: :temporary
}
end
end