Support authentication with Redis Sentinel

... so that users can enable authentication in both Redis and Redis
Sentinel.

Change-Id: I3e68e23cf89081cca829d4f78f1d1b35a11d9496

releasenotes/notes/redis-sentinel-authentication-93fa9b1846979e41.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Now Redis driver supports authentication with Redis Sentinel. To use this
+    feature, add the ``redis_password`` query to the Redis URI.
+    The ``redis_username`` can be used when ACL feature is enabled.

zaqar/storage/redis/driver.py

@@ -85,6 +85,8 @@ class ConnectionURI(object):
         # Sentinel
         self.master = None
         self.sentinels = []
+        self.sentinel_username = query_params.get('sentinel_username')
+        self.sentinel_password = query_params.get('sentinel_password')
 
         if 'master' in query_params:
             # NOTE(prashanthr_): Configure redis driver in sentinel mode
@@ -322,11 +324,12 @@ def _get_redis_client(driver):
             db=connection_uri.dbid,
             username=connection_uri.username,
             password=connection_uri.password,
+            sentinel_kwargs={
+                'socket_timeout': connection_uri.socket_timeout,
+                'username': connection_uri.sentinel_username,
+                'password': connection_uri.sentinel_password
+            },
             socket_timeout=connection_uri.socket_timeout)
-
-        # NOTE(prashanthr_): The socket_timeout parameter being generic
-        # to all redis connections is inherited from the parameters for
-        # sentinel.
         return sentinel.master_for(connection_uri.master)
 
     elif connection_uri.strategy == STRATEGY_TCP:

zaqar/tests/unit/storage/test_impl_redis.py

@@ -337,6 +337,8 @@ class RedisDriverTest(testing.TestBase):
         self.assertEqual(0, uri.dbid)
         self.assertIsNone(uri.username)
         self.assertIsNone(uri.password)
+        self.assertIsNone(uri.sentinel_username)
+        self.assertIsNone(uri.sentinel_password)
 
         uri = driver.ConnectionURI('redis://s1,s2?master=dumbledore')
         self.assertEqual(driver.STRATEGY_SENTINEL, uri.strategy)
@@ -346,6 +348,8 @@ class RedisDriverTest(testing.TestBase):
         self.assertEqual(0, uri.dbid)
         self.assertIsNone(uri.username)
         self.assertIsNone(uri.password)
+        self.assertIsNone(uri.sentinel_username)
+        self.assertIsNone(uri.sentinel_password)
 
         uri = driver.ConnectionURI('redis://s1:26389,s1?master=dumbledore')
         self.assertEqual(driver.STRATEGY_SENTINEL, uri.strategy)
@@ -355,6 +359,8 @@ class RedisDriverTest(testing.TestBase):
         self.assertEqual(0, uri.dbid)
         self.assertIsNone(uri.username)
         self.assertIsNone(uri.password)
+        self.assertIsNone(uri.sentinel_username)
+        self.assertIsNone(uri.sentinel_password)
 
         uri = driver.ConnectionURI(
             'redis://[::1]:26389,[::2]?master=dumbledore')
@@ -365,6 +371,8 @@ class RedisDriverTest(testing.TestBase):
         self.assertEqual(0, uri.dbid)
         self.assertIsNone(uri.username)
         self.assertIsNone(uri.password)
+        self.assertIsNone(uri.sentinel_username)
+        self.assertIsNone(uri.sentinel_password)
 
         uri = driver.ConnectionURI(
             'redis://s1?master=dumbledore&socket_timeout=0.5')
@@ -375,6 +383,8 @@ class RedisDriverTest(testing.TestBase):
         self.assertEqual(0, uri.dbid)
         self.assertIsNone(uri.username)
         self.assertIsNone(uri.password)
+        self.assertIsNone(uri.sentinel_username)
+        self.assertIsNone(uri.sentinel_password)
 
         uri = driver.ConnectionURI(
             'redis://:test123@s1?master=dumbledore&socket_timeout=0.5&dbid=5')
@@ -385,6 +395,8 @@ class RedisDriverTest(testing.TestBase):
         self.assertEqual(5, uri.dbid)
         self.assertIsNone(uri.username)
         self.assertEqual('test123', uri.password)
+        self.assertIsNone(uri.sentinel_username)
+        self.assertIsNone(uri.sentinel_password)
 
         # NOTE(tkajinam): Test fallback for backword compatibility
         uri = driver.ConnectionURI(
@@ -396,6 +408,8 @@ class RedisDriverTest(testing.TestBase):
         self.assertEqual(0, uri.dbid)
         self.assertIsNone(uri.username)
         self.assertEqual('test123', uri.password)
+        self.assertIsNone(uri.sentinel_username)
+        self.assertIsNone(uri.sentinel_password)
 
         uri = driver.ConnectionURI(
             'redis://default:test123@s1?master=dumbledore')
@@ -406,6 +420,21 @@ class RedisDriverTest(testing.TestBase):
         self.assertEqual(0, uri.dbid)
         self.assertEqual('default', uri.username)
         self.assertEqual('test123', uri.password)
+        self.assertIsNone(uri.sentinel_username)
+        self.assertIsNone(uri.sentinel_password)
+
+        uri = driver.ConnectionURI(
+            'redis://default:test123@s1?master=dumbledore'
+            '&sentinel_username=sentinel&sentinel_password=test456')
+        self.assertEqual(driver.STRATEGY_SENTINEL, uri.strategy)
+        self.assertEqual([('s1', 26379)], uri.sentinels)
+        self.assertEqual('dumbledore', uri.master)
+        self.assertEqual(0.1, uri.socket_timeout)
+        self.assertEqual(0, uri.dbid)
+        self.assertEqual('default', uri.username)
+        self.assertEqual('test123', uri.password)
+        self.assertEqual('sentinel', uri.sentinel_username)
+        self.assertEqual('test456', uri.sentinel_password)
 
 
 @testing.requires_redis