Support MFA for :password in :sentinel option

lib/redix/start_options.ex

@@ -209,7 +209,8 @@ defmodule Redix.StartOptions do
           """
         ],
         password: [
-          type: :string,
+          type: {:or, [:string, :mfa]},
+          type_doc: "`String.t/0` or `{mod, fun, args}`",
           doc: """
           if you don't want to specify a password for each sentinel you
           list, you can use this option to specify a password that will be used to authenticate

test/redix/sentinel_test.exs

@@ -77,6 +77,45 @@ defmodule Redix.SentinelTest do
     assert Redix.command!(pid, ["PING"]) == "PONG"
   end
 
+  test "sentinel supports password mfa in sentinels list", %{sentinel_config: sentinel_config} do
+    System.put_env("REDIX_SENTINEL_MFA_PASSWORD", "sentinel-password")
+
+    password_mfa = {System, :get_env, ["REDIX_SENTINEL_MFA_PASSWORD"]}
+
+    sentinel_config =
+      Keyword.merge(sentinel_config,
+        sentinels: [[host: "localhost", port: 26383, password: password_mfa]]
+      )
+
+    pid =
+      start_supervised!(
+        {Redix, sentinel: sentinel_config, password: "main-password", sync_connect: true}
+      )
+
+    assert Redix.command!(pid, ["PING"]) == "PONG"
+  after
+    System.delete_env("REDIX_SENTINEL_MFA_PASSWORD")
+  end
+
+  test "sentinel supports global password mfa", %{sentinel_config: sentinel_config} do
+    System.put_env("REDIX_SENTINEL_MFA_PASSWORD", "sentinel-password")
+
+    sentinel_config =
+      Keyword.merge(sentinel_config,
+        password: {System, :get_env, ["REDIX_SENTINEL_MFA_PASSWORD"]},
+        sentinels: ["redis://localhost:26383"]
+      )
+
+    pid =
+      start_supervised!(
+        {Redix, sentinel: sentinel_config, password: "main-password", sync_connect: true}
+      )
+
+    assert Redix.command!(pid, ["PING"]) == "PONG"
+  after
+    System.delete_env("REDIX_SENTINEL_MFA_PASSWORD")
+  end
+
   test "failed sentinel connection" do
     {test_name, _arity} = __ENV__.function
 

test/redix/start_options_test.exs

@@ -102,6 +102,49 @@ defmodule Redix.StartOptionsTest do
       end
     end
 
+    test "sentinel password string" do
+      opts =
+        StartOptions.sanitize(
+          sentinel: [
+            sentinels: [
+              [host: "host1", port: 26379, password: "secret1"],
+              [host: "host2", port: 26379]
+            ],
+            group: "mygroup",
+            password: "secret2"
+          ]
+        )
+
+      sentinels = opts[:sentinel][:sentinels]
+
+      assert Enum.count(sentinels) == 2
+      assert Enum.find(sentinels, &(&1[:host] == 'host1'))[:password] == "secret1"
+      assert Enum.find(sentinels, &(&1[:host] == 'host2'))[:password] == "secret2"
+    end
+
+    test "sentinel password mfa" do
+      mfa1 = {System, :fetch_env!, ["REDIS_PASS1"]}
+      mfa2 = {System, :fetch_env!, ["REDIS_PASS2"]}
+
+      opts =
+        StartOptions.sanitize(
+          sentinel: [
+            sentinels: [
+              [host: "host1", port: 26379, password: mfa1],
+              [host: "host2", port: 26379]
+            ],
+            group: "mygroup",
+            password: mfa2
+          ]
+        )
+
+      sentinels = opts[:sentinel][:sentinels]
+
+      assert Enum.count(sentinels) == 2
+      assert Enum.find(sentinels, &(&1[:host] == 'host1'))[:password] == mfa1
+      assert Enum.find(sentinels, &(&1[:host] == 'host2'))[:password] == mfa2
+    end
+
     test "gen_statem options are allowed" do
       opts =
         StartOptions.sanitize(hibernate_after: 1000, debug: [], spawn_opt: [fullsweep_after: 0])