reset request counts in rate limiter every day at midnight

lib/application.ex

@@ -8,6 +8,7 @@ defmodule PlantIdDiscordBot.Application do
     children = [
       PlantIdDiscordBot.Consumer,
       PlantIdDiscordBot.RateLimiter,
+      PlantIdDiscordBot.Scheduler,
       {Plug.Cowboy, scheme: :http, plug: PlantIdDiscordBot.FileServer, options: [port: @port]}
     ]
 

lib/plantid_discord_bot/cogs/plantnet.ex

@@ -15,7 +15,7 @@ defmodule PlantIdDiscordBot.Cog.PlantNet do
   """
   def id(interaction) do
     case RateLimiter.check_limit(interaction.guild_id) do
-      {:limit_exceeded, value} ->
+      {:limit_exceeded, _} ->
         @api.create_interaction_response(interaction, %{
           type: 4,
           data: %{

lib/plantid_discord_bot/rate_limiter.ex

@@ -47,6 +47,15 @@ defmodule PlantIdDiscordBot.RateLimiter do
   Increase the counter for the number of requests for a guild by one.
   """
   def increase_counter(guild_id) do
-    :ets.update_counter(__MODULE__, guild_id, 1)
+    case get(guild_id) do
+      {:ok, _} -> :ets.update_counter(__MODULE__, guild_id, 1)
+      {:error, _} -> put(guild_id, 1)
+    end
   end
+
+  @doc """
+  Reset all guilds counters to 0.
+  """
+  @spec reset_counters() :: :ok
+  def reset_counters(), do: :ets.delete_all_objects(__MODULE__)
 end

lib/scheduler.ex

@@ -0,0 +1,3 @@
+defmodule PlantIdDiscordBot.Scheduler do
+  use Quantum, otp_app: :plantid_discord_bot
+end