xgroup_createconsumer (#1553)

Author: AvitalFineRedis

redis/commands.py

@@ -1870,6 +1870,18 @@ def xgroup_destroy(self, name, groupname):
         """
         return self.execute_command('XGROUP DESTROY', name, groupname)
 
+    def xgroup_createconsumer(self, name, groupname, consumername):
+        """
+        Consumers in a consumer group are auto-created every time a new
+        consumer name is mentioned by some command.
+        They can be explicitly created by using this command.
+        name: name of the stream.
+        groupname: name of the consumer group.
+        consumername: name of consumer to create.
+        """
+        return self.execute_command('XGROUP CREATECONSUMER', name, groupname,
+                                    consumername)
+
     def xgroup_setid(self, name, groupname, id):
         """
         Set the consumer group last delivered ID to something else.

tests/test_commands.py

@@ -2731,6 +2731,22 @@ def test_xgroup_delconsumer(self, r):
         # deleting the consumer should return 2 pending messages
         assert r.xgroup_delconsumer(stream, group, consumer) == 2
 
+    @skip_if_server_version_lt('6.2.0')
+    def test_xgroup_createconsumer(self, r):
+        stream = 'stream'
+        group = 'group'
+        consumer = 'consumer'
+        r.xadd(stream, {'foo': 'bar'})
+        r.xadd(stream, {'foo': 'bar'})
+        r.xgroup_create(stream, group, 0)
+        assert r.xgroup_createconsumer(stream, group, consumer) == 1
+
+        # read all messages from the group
+        r.xreadgroup(group, consumer, streams={stream: '>'})
+
+        # deleting the consumer should return 2 pending messages
+        assert r.xgroup_delconsumer(stream, group, consumer) == 2
+
     @skip_if_server_version_lt('5.0.0')
     def test_xgroup_destroy(self, r):
         stream = 'stream'