refacor(elixir): automatic start_link for backword-compatibility

platform/elixir/mail_checker.ex

@@ -9,6 +9,8 @@ defmodule MailChecker do
   end
 
   def add_custom_domains(new_domains) do
+    ensure_started()
+
     Agent.update(__MODULE__, fn config ->
       Map.update(config, :custom_domains, @initial_config[:custom_domains], fn existing_custom_domains ->
         new_domains
@@ -41,7 +43,16 @@ defmodule MailChecker do
     Regex.match?(~r/\A(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)|(?:\x22?[^\x5C\x22]\x22?)){255,})(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)|(?:\x22?[^\x5C\x22]\x22?)){65,}@)(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]|(?:\x5C[\x00-\x7F]))*\x22))(?:\.(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]|(?:\x5C[\x00-\x7F]))*\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-[a-z0-9]+)*\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-[a-z0-9]+)*)|(?:\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\]))\z/i, email)
   end
 
+  defp ensure_started do
+    case start_link() do
+      {:ok, pid} -> pid
+      {:error, {:already_started, pid}} -> pid
+    end
+  end
+
   defp custom_domains do
+    ensure_started()
+
     Agent.get(__MODULE__, & &1[:custom_domains])
   end
 

platform/elixir/mail_checker.tmpl.ex

@@ -9,6 +9,8 @@ defmodule MailChecker do
   end
 
   def add_custom_domains(new_domains) do
+    ensure_started()
+
     Agent.update(__MODULE__, fn config ->
       Map.update(config, :custom_domains, @initial_config[:custom_domains], fn existing_custom_domains ->
         new_domains
@@ -41,7 +43,16 @@ defmodule MailChecker do
     Regex.match?(~r/\A{{& unanchoredRegexpString }}\z/i, email)
   end
 
+  defp ensure_started do
+    case start_link() do
+      {:ok, pid} -> pid
+      {:error, {:already_started, pid}} -> pid
+    end
+  end
+
   defp custom_domains do
+    ensure_started()
+
     Agent.get(__MODULE__, & &1[:custom_domains])
   end
 

test/platform.elixir.test.exs

@@ -25,7 +25,6 @@ defmodule MailCheckerTest do
   end
 
   test "should return true if the email is valid" do
-    {:ok, _pid} = MailChecker.start_link() # FIXME: This is a breaking change :(
     assert_valid("[email protected]")
     assert_valid("[email protected]")
     assert_valid("[email protected]")
@@ -48,15 +47,13 @@ defmodule MailCheckerTest do
   end
 
   test "should return false if the email come from a throwable domain" do
-    {:ok, _pid} = MailChecker.start_link() # FIXME: This is a breaking change :(
     assert_invalid("[email protected]")
     assert_invalid("[email protected]")
     assert_invalid("[email protected]")
     assert_invalid("[email protected]")
   end
 
   test "should return false if the email is from a blacklisted domain" do
-    {:ok, _pid} = MailChecker.start_link() # FIXME: This is a breaking change :(
     Enum.each(MailChecker.blacklist, fn domain ->
         assert_invalid("test@" <> domain)
         assert_invalid("test@subdomain." <> domain)
@@ -65,7 +62,6 @@ defmodule MailCheckerTest do
   end
 
   test "should return false if the email is from a custom domain" do
-    {:ok, _pid} = MailChecker.start_link()
     assert_valid("[email protected]")
     assert_valid("[email protected]")
     assert_valid("[email protected]")
@@ -75,5 +71,9 @@ defmodule MailCheckerTest do
     assert_invalid("[email protected]")
     assert_invalid("[email protected]")
     assert_valid("[email protected]")
+
+    MailChecker.add_custom_domains(["gmail.com"])
+
+    assert_invalid("[email protected]")
   end
 end