Created
May 8, 2023 20:27
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| defmodule MyApp.PresenceDrainer do | |
| use GenServer | |
| require Logger | |
| def start_link(opts \\\\ []) do | |
| GenServer.start_link(__MODULE__, opts, name: __MODULE__) | |
| end | |
| @impl GenServer | |
| def init(_init_arg) do | |
| # We need to trap exits so that we receive the `terminate/2` callback during | |
| # a graceful shutdown | |
| Process.flag(:trap_exit, true) | |
| {:ok, []} | |
| end | |
| # NOTE: We cannot guarantee that this will run on every shutdown, it will only | |
| # get run on graceful shutdowns such as via a SIGTERM which is what is often | |
| # used for zero-downtime deploys | |
| @impl GenServer | |
| def terminate(_reason, _state) do | |
| Logger.info("Shutting down FeltServerWeb.Presence") | |
| Phoenix.Tracker.graceful_permdown(MyAppWeb.Presence) | |
| :ok | |
| end | |
| end |
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