fix(con cache): allow concache to accept ets options

Author: cking222

CHANGELOG.md

@@ -1,3 +1,6 @@
+# 0.3.13
+- fix: allow `Cache.ConCache` to accept `ets_options` (strict NimbleOptions validation + normalization)
+
 # 0.3.12
 - chore: fix warnings
 

lib/cache/ets.ex

@@ -225,6 +225,51 @@ defmodule Cache.ETS do
   @impl Cache
   def opts_definition, do: @opts_definition
 
+  def opts_definition(opts) when is_list(opts) do
+    if Keyword.keyword?(opts) do
+      validate_and_normalize_ets_options(opts)
+    else
+      {:error, "expected a keyword list"}
+    end
+  end
+
+  def opts_definition(_opts), do: {:error, "expected a keyword list"}
+
+  defp validate_and_normalize_ets_options(opts) do
+    case NimbleOptions.validate(opts, @opts_definition) do
+      {:ok, validated} ->
+        {:ok, normalize_ets_options(opts, validated)}
+
+      {:error, %NimbleOptions.ValidationError{} = error} ->
+        {:error, Exception.message(error)}
+    end
+  end
+
+  defp normalize_ets_options(original_opts, validated) do
+    Enum.reject(
+      [
+        maybe_type(original_opts, validated),
+        maybe_compressed(original_opts, validated),
+        maybe_kv(original_opts, validated, :read_concurrency),
+        maybe_kv(original_opts, validated, :write_concurrency),
+        maybe_kv(original_opts, validated, :decentralized_counters)
+      ],
+      &is_nil/1
+    )
+  end
+
+  defp maybe_type(original_opts, validated) do
+    if Keyword.has_key?(original_opts, :type), do: validated[:type]
+  end
+
+  defp maybe_compressed(original_opts, validated) do
+    if Keyword.has_key?(original_opts, :compressed) and validated[:compressed], do: :compressed
+  end
+
+  defp maybe_kv(original_opts, validated, key) do
+    if Keyword.has_key?(original_opts, key), do: {key, validated[key]}
+  end
+
   @impl Cache
   def start_link(opts) do
     Task.start_link(fn ->

mix.exs

@@ -4,7 +4,7 @@ defmodule ElixirCache.MixProject do
   def project do
     [
       app: :elixir_cache,
-      version: "0.3.12",
+      version: "0.3.13",
       elixir: "~> 1.11",
       start_permanent: Mix.env() == :prod,
       description:

test/cache/con_cache_test.exs

@@ -5,6 +5,39 @@ defmodule Cache.ConCacheTest do
   """
   use ExUnit.Case, async: true
 
+  describe "ets_options validation" do
+    test "accepts ets_options keyword list" do
+      validated =
+        NimbleOptions.validate!(
+          [ets_options: [read_concurrency: true, write_concurrency: false]],
+          Cache.ConCache.opts_definition()
+        )
+
+      assert [
+               {:read_concurrency, true},
+               {:write_concurrency, false}
+             ] = validated[:ets_options]
+    end
+
+    test "rejects unknown ets_options keys" do
+      assert_raise NimbleOptions.ValidationError, fn ->
+        NimbleOptions.validate!(
+          [ets_options: [read_concurency: true]],
+          Cache.ConCache.opts_definition()
+        )
+      end
+    end
+
+    test "rejects invalid ets_options value types" do
+      assert_raise NimbleOptions.ValidationError, fn ->
+        NimbleOptions.validate!(
+          [ets_options: [read_concurrency: :yes]],
+          Cache.ConCache.opts_definition()
+        )
+      end
+    end
+  end
+
   defmodule ConCacheAdapter do
     use Cache,
       adapter: Cache.ConCache,