use :ets to store roles list in cache dwyl/auth#110

.travis.yml

@@ -1,8 +1,8 @@
 language: elixir
 elixir:
-  - 1.10.2
+  - 1.10.4
 otp_release:
-  - 22.1.8
+  - 23.0.3
 env:
   - MIX_ENV=test
 script:

lib/rbac.ex

@@ -39,7 +39,7 @@ defmodule RBAC do
   end
 
   @doc """
-  `get_approles/1` fetches the roles for the app
+  `get_approles/2` fetches the roles for the app
   """
   def get_approles(auth_url, client_id) do
     url = "#{auth_url}/approles/#{client_id}"
@@ -69,4 +69,18 @@ defmodule RBAC do
     end # https://stackoverflow.com/questions/31990134
   end
 
+  @doc """
+  `init_roles/2
+  """
+  def init_roles(auth_url, client_id) do
+    {:ok, roles} = RBAC.get_approles(auth_url, client_id)
+    :ets.new(:roles_cache, [:set, :protected, :named_table])
+    # insert full list:
+    :ets.insert(:roles_cache, {"roles", roles})
+    # insert individual roles for fast lookup:
+    Enum.each(roles, fn role -> 
+      :ets.insert(:roles_cache, {role.name, role})
+      :ets.insert(:roles_cache, {role.id, role})
+    end)
+  end
 end

mix.exs

@@ -4,7 +4,7 @@ defmodule Rbac.MixProject do
   def project do
     [
       app: :rbac,
-      version: "0.3.0",
+      version: "1.0.0",
       elixir: "~> 1.10",
       start_permanent: Mix.env() == :prod,
       deps: deps(),

test/rbac_test.exs

@@ -102,4 +102,21 @@ defmodule RBACTest do
     assert length(roles) > 7
   end
 
+  test "init_roles/2 inserts roles list into ETS cache" do
+    auth_url = "https://dwylauth.herokuapp.com"
+    client_id = AuthPlug.Token.client_id()
+    RBAC.init_roles(auth_url, client_id)
+
+    # confirm full roles inserted
+    {_, list} = :ets.lookup(:roles_cache, "roles") |> List.first()
+    assert length(list) == 9
+
+    # lookup role by id:
+    {_, role} = :ets.lookup(:roles_cache, 1) |> List.first()
+    assert role.name == "superadmin"
+
+    # lookup role by name:
+    {_, role} = :ets.lookup(:roles_cache, "admin") |> List.first()
+    assert role.id == 2
+  end
 end