Simplify rate limiter slide: strip to essential GenServer logic

Torey Heinz committed Feb 22, 2026

commit 436ac6652cf6064f4d2a4f1c51c99b8b51859838

Showing 1 changed file with 5 additions and 18 deletions

slides/03-real-world.html +5 -18

@@	@@ -164,31 +164,18 @@ end
	defmodule Marketing.EmailRateLimiter do
	use GenServer

-	defstruct tokens: 0.0, rate: 100.0,
-	daily_remaining: 750_000, last_refill_ms: nil
+	defstruct tokens: 0.0, rate: 100.0

	# Public API — other code just calls this
	def ready?, do: GenServer.call(__MODULE__, :acquire)

-	def init(_opts) do
-	state = %__MODULE__{last_refill_ms: now_ms()}
-	Process.send_after(self(), :refill, 1_000)
-	{:ok, state}
-	end
-
-	# Synchronous check: can we send right now?
	def handle_call(:acquire, _from, state) do
	state = refill(state)

-	cond do
-	state.daily_remaining <= 1_000 ->
-	{:reply, {:not_ready, :exceeded_daily}, state}
-	state.tokens >= 1.0 ->
-	{:reply, {:ok, :token},
-	%{state \| tokens: state.tokens - 1.0,
-	daily_remaining: state.daily_remaining - 1}}
-	true ->
-	{:reply, {:not_ready, :exceeded_rate}, state}
+	if state.tokens >= 1.0 do
+	{:reply, {:ok, :token}, %{state \| tokens: state.tokens - 1.0}}
+	else
+	{:reply, {:not_ready, :exceeded_rate}, state}
	end
	end
	end