Add support for CLUSTER MYID (#2063)

Co-authored-by: enjoy-binbin <binbin.zhu@tenclass.com>

Author: enjoy-binbin

redis/commands/cluster.py

@@ -275,6 +275,17 @@ class RedisClusterCommands(
         r.cluster_info(target_nodes=RedisCluster.ALL_NODES)
     """
 
+    def cluster_myid(self, target_node):
+        """
+        Returns the node’s id.
+
+        :target_node: 'ClusterNode'
+            The node to execute the command on
+
+        For more information check https://redis.io/commands/cluster-myid/
+        """
+        return self.execute_command("CLUSTER MYID", target_nodes=target_node)
+
     def cluster_addslots(self, target_node, *slots):
         """
         Assign new hash slots to receiving node. Sends to specified node.

tests/test_cluster.py

@@ -840,6 +840,11 @@ def test_cluster_pubsub_numsub(self, r):
         channels = [(b"foo", 1), (b"bar", 2), (b"baz", 3)]
         assert r.pubsub_numsub("foo", "bar", "baz", target_nodes="all") == channels
 
+    def test_cluster_myid(self, r):
+        node = r.get_random_node()
+        myid = r.cluster_myid(node)
+        assert len(myid) == 40
+
     def test_cluster_slots(self, r):
         mock_all_nodes_resp(r, default_cluster_slots)
         cluster_slots = r.cluster_slots()