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BEAM-on-device mobile framework for Elixir
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lib/mob/plugins/supervisor.ex
defmodule Mob.Plugins.Supervisor do
@moduledoc """
Supervises the tier-4 plugins' lifecycle.
On init it runs each plugin's `lifecycle.on_start` MFA in order (an error
return bubbles up and fails boot loud, per the spec), then supervises the
plugins' declared `lifecycle.supervised` child specs alongside the
`Mob.Plugins.Lifecycle` event dispatcher. Started from `Mob.App.start/0`
(just before the host's own `on_start/0`, so a host `on_start` that blocks on
a run loop can't starve plugin startup — the framework services a plugin's
`on_start` needs are already up), and only when a plugin declares a
`:lifecycle` (see `Mob.Plugins.start_lifecycle/0`).
"""
use Supervisor
@spec start_link(term()) :: Supervisor.on_start()
def start_link(_arg), do: Supervisor.start_link(__MODULE__, :ok, name: __MODULE__)
@impl Supervisor
def init(:ok) do
lifecycles = Mob.Plugins.lifecycle()
run_on_start!(lifecycles)
children = supervised_children(lifecycles) ++ [Mob.Plugins.Lifecycle]
Supervisor.init(children, strategy: :one_for_one)
end
defp run_on_start!(lifecycles) do
for %{on_start: {m, f, a}} = lc <- lifecycles do
case apply(m, f, a) do
{:error, reason} ->
raise "plugin #{inspect(lc[:plugin])} on_start failed: #{inspect(reason)}"
_ok ->
:ok
end
end
end
# Flattens every plugin's `lifecycle.supervised` child specs into one list.
defp supervised_children(lifecycles) do
for lc <- lifecycles, child <- Map.get(lc, :supervised, []), do: child
end
end