Fixing sync BlockingConnectionPool's disconnect method to follow the definition in ConnectionPoolInterface (#3802)

* Fixing sync BlockingConnectionPool's disconnect method to follow the definition of the interface

* Fixing linter errors

Author: petyaslavova

redis/connection.py

@@ -2954,14 +2954,18 @@ def release(self, connection):
                     pass
                 self._locked = False
 
-    def disconnect(self):
-        "Disconnects all connections in the pool."
+    def disconnect(self, inuse_connections: bool = True):
+        "Disconnects either all connections in the pool or just the free connections."
         self._checkpid()
         try:
             if self._in_maintenance:
                 self._lock.acquire()
                 self._locked = True
-            for connection in self._connections:
+            if inuse_connections:
+                connections = self._connections
+            else:
+                connections = self._get_free_connections()
+            for connection in connections:
                 connection.disconnect()
         finally:
             if self._locked:

tests/test_asyncio/test_connection_pool.py

@@ -95,15 +95,20 @@ class DummyConnection(Connection):
 
     def __init__(self, **kwargs):
         self.kwargs = kwargs
+        self._connected = False
 
     def repr_pieces(self):
         return [("id", id(self)), ("kwargs", self.kwargs)]
 
     async def connect(self):
-        pass
+        self._connected = True
 
     async def disconnect(self):
-        pass
+        self._connected = False
+
+    @property
+    def is_connected(self):
+        return self._connected
 
     async def can_read_destructive(self, timeout: float = 0):
         return False
@@ -203,6 +208,20 @@ async def test_repr_contains_db_info_unix(self):
             expected = "path=/abc,db=1,client_name=test-client"
             assert expected in repr(pool)
 
+    async def test_pool_disconnect(self, master_host):
+        connection_kwargs = {
+            "host": master_host[0],
+            "port": master_host[1],
+        }
+        async with self.get_pool(connection_kwargs=connection_kwargs) as pool:
+            conn = await pool.get_connection()
+            await pool.disconnect(inuse_connections=True)
+            assert not conn.is_connected
+
+            await conn.connect()
+            await pool.disconnect(inuse_connections=False)
+            assert conn.is_connected
+
 
 class TestBlockingConnectionPool:
     @asynccontextmanager
@@ -231,17 +250,21 @@ async def test_connection_creation(self, master_host):
             assert isinstance(connection, DummyConnection)
             assert connection.kwargs == connection_kwargs
 
-    async def test_disconnect(self, master_host):
-        """A regression test for #1047"""
+    async def test_pool_disconnect(self, master_host):
         connection_kwargs = {
             "foo": "bar",
             "biz": "baz",
             "host": master_host[0],
             "port": master_host[1],
         }
         async with self.get_pool(connection_kwargs=connection_kwargs) as pool:
-            await pool.get_connection()
+            conn = await pool.get_connection()
             await pool.disconnect()
+            assert not conn.is_connected
+
+            await conn.connect()
+            await pool.disconnect(inuse_connections=False)
+            assert conn.is_connected
 
     async def test_multiple_connections(self, master_host):
         connection_kwargs = {"host": master_host[0], "port": master_host[1]}

tests/test_connection_pool.py

@@ -29,9 +29,13 @@ class DummyConnection:
     def __init__(self, **kwargs):
         self.kwargs = kwargs
         self.pid = os.getpid()
+        self._sock = None
 
     def connect(self):
-        pass
+        self._sock = mock.Mock()
+
+    def disconnect(self):
+        self._sock = None
 
     def can_read(self):
         return False
@@ -140,6 +144,21 @@ def test_repr_contains_db_info_unix(self):
         expected = "path=/abc,db=1,client_name=test-client"
         assert expected in repr(pool)
 
+    def test_pool_disconnect(self, master_host):
+        connection_kwargs = {
+            "host": master_host[0],
+            "port": master_host[1],
+        }
+        pool = self.get_pool(connection_kwargs=connection_kwargs)
+
+        conn = pool.get_connection()
+        pool.disconnect()
+        assert not conn._sock
+
+        conn.connect()
+        pool.disconnect(inuse_connections=False)
+        assert conn._sock
+
 
 class TestBlockingConnectionPool:
     def get_pool(self, connection_kwargs=None, max_connections=10, timeout=20):
@@ -244,6 +263,23 @@ def test_initialise_pool_with_cache(self, master_host):
         )
         assert isinstance(pool.get_connection(), CacheProxyConnection)
 
+    def test_pool_disconnect(self, master_host):
+        connection_kwargs = {
+            "foo": "bar",
+            "biz": "baz",
+            "host": master_host[0],
+            "port": master_host[1],
+        }
+        pool = self.get_pool(connection_kwargs=connection_kwargs)
+
+        conn = pool.get_connection()
+        pool.disconnect()
+        assert not conn._sock
+
+        conn.connect()
+        pool.disconnect(inuse_connections=False)
+        assert conn._sock
+
 
 class TestConnectionPoolURLParsing:
     def test_hostname(self):