[Hotfix] Fix SSL connection for scheduler (#1894)

* fix: ssl

* fix: reinstate a test for parse_connection

rq/connections.py

@@ -118,23 +118,10 @@ def resolve_connection(connection: Optional['Redis'] = None) -> 'Redis':
 
 
 def parse_connection(connection: Redis) -> Tuple[Type[Redis], Type[RedisConnection], dict]:
-    connection_kwargs = connection.connection_pool.connection_kwargs.copy()
-    # Redis does not accept parser_class argument which is sometimes present
-    # on connection_pool kwargs, for example when hiredis is used
-    connection_kwargs.pop('parser_class', None)
+    connection_pool_kwargs = connection.connection_pool.connection_kwargs.copy()
     connection_pool_class = connection.connection_pool.connection_class
-    if issubclass(connection_pool_class, SSLConnection):
-        connection_kwargs['ssl'] = True
-    if issubclass(connection_pool_class, UnixDomainSocketConnection):
-        # The connection keyword arguments are obtained from
-        # `UnixDomainSocketConnection`, which expects `path`, but passed to
-        # `redis.client.Redis`, which expects `unix_socket_path`, renaming
-        # the key is necessary.
-        # `path` is not left in the dictionary as that keyword argument is
-        # not expected by `redis.client.Redis` and would raise an exception.
-        connection_kwargs['unix_socket_path'] = connection_kwargs.pop('path')
-
-    return connection.__class__, connection_pool_class, connection_kwargs
+
+    return connection.__class__, connection_pool_class, connection_pool_kwargs
 
 
 _connection_stack = LocalStack()

rq/scheduler.py

@@ -50,7 +50,7 @@ class RQScheduler:
         self._acquired_locks: Set[str] = set()
         self._scheduled_job_registries: List[ScheduledJobRegistry] = []
         self.lock_acquisition_time = None
-        self._connection_class, self._pool_class, self._connection_kwargs = parse_connection(connection)
+        self._connection_class, self._pool_class, self._pool_kwargs = parse_connection(connection)
         self.serializer = resolve_serializer(serializer)
 
         self._connection = None
@@ -71,7 +71,7 @@ class RQScheduler:
         if self._connection:
             return self._connection
         self._connection = self._connection_class(
-            connection_pool=ConnectionPool(connection_class=self._pool_class, **self._connection_kwargs)
+            connection_pool=ConnectionPool(connection_class=self._pool_class, **self._pool_kwargs)
         )
         return self._connection
 

rq/worker_pool.py

@@ -11,7 +11,7 @@ from typing import Dict, List, NamedTuple, Optional, Set, Type, Union
 from uuid import uuid4
 
 from redis import Redis
-from redis import SSLConnection, UnixDomainSocketConnection
+from redis import ConnectionPool
 from rq.serializers import DefaultSerializer
 
 from rq.timeouts import HorseMonitorTimeoutException, UnixSignalDeathPenalty
@@ -65,7 +65,7 @@ class WorkerPool:
 
         # A dictionary of WorkerData keyed by worker name
         self.worker_dict: Dict[str, WorkerData] = {}
-        self._connection_class, _, self._connection_kwargs = parse_connection(connection)
+        self._connection_class, self._pool_class, self._pool_kwargs = parse_connection(connection)
 
     @property
     def queues(self) -> List[Queue]:
@@ -158,7 +158,7 @@ class WorkerPool:
         name = uuid4().hex
         process = Process(
             target=run_worker,
-            args=(name, self._queue_names, self._connection_class, self._connection_kwargs),
+            args=(name, self._queue_names, self._connection_class, self._pool_class, self._pool_kwargs),
             kwargs={
                 '_sleep': _sleep,
                 'burst': burst,
@@ -234,7 +234,8 @@ def run_worker(
     worker_name: str,
     queue_names: List[str],
     connection_class,
-    connection_kwargs: dict,
+    connection_pool_class,
+    connection_pool_kwargs: dict,
     worker_class: Type[BaseWorker] = Worker,
     serializer: Type[DefaultSerializer] = DefaultSerializer,
     job_class: Type[Job] = Job,
@@ -242,7 +243,9 @@ def run_worker(
     logging_level: str = "INFO",
     _sleep: int = 0,
 ):
-    connection = connection_class(**connection_kwargs)
+    connection = connection_class(
+        connection_pool=ConnectionPool(connection_class=connection_pool_class, **connection_pool_kwargs)
+    )
     queues = [Queue(name, connection=connection) for name in queue_names]
     worker = worker_class(queues, name=worker_name, connection=connection, serializer=serializer, job_class=job_class)
     worker.log.info("Starting worker started with PID %s", os.getpid())

tests/test_connection.py

@@ -1,4 +1,4 @@
-from redis import ConnectionPool, Redis, UnixDomainSocketConnection
+from redis import ConnectionPool, Redis, SSLConnection, UnixDomainSocketConnection
 
 from rq import Connection, Queue
 from rq.connections import parse_connection
@@ -38,10 +38,14 @@ class TestConnectionInheritance(RQTestCase):
         self.assertEqual(q2.connection, job2.connection)
 
     def test_parse_connection(self):
-        """Test parsing `ssl` and UnixDomainSocketConnection"""
-        _, _, kwargs = parse_connection(Redis(ssl=True))
-        self.assertTrue(kwargs['ssl'])
+        """Test parsing the connection"""
+        conn_class, pool_class, pool_kwargs = parse_connection(Redis(ssl=True))
+        self.assertEqual(conn_class, Redis)
+        self.assertEqual(pool_class, SSLConnection)
+
         path = '/tmp/redis.sock'
         pool = ConnectionPool(connection_class=UnixDomainSocketConnection, path=path)
-        _, _, kwargs = parse_connection(Redis(connection_pool=pool))
-        self.assertTrue(kwargs['unix_socket_path'], path)
+        conn_class, pool_class, pool_kwargs = parse_connection(Redis(connection_pool=pool))
+        self.assertEqual(conn_class, Redis)
+        self.assertEqual(pool_class, UnixDomainSocketConnection)
+        self.assertEqual(pool_kwargs, {"path": path})

tests/test_worker_pool.py

@@ -8,6 +8,7 @@ from rq.job import JobStatus
 from tests import TestCase
 from tests.fixtures import CustomJob, _send_shutdown_command, long_running_job, say_hello
 
+from rq.connections import parse_connection
 from rq.queue import Queue
 from rq.serializers import JSONSerializer
 from rq.worker import SimpleWorker
@@ -108,8 +109,10 @@ class TestWorkerPool(TestCase):
         """Ensure run_worker() properly spawns a Worker"""
         queue = Queue('foo', connection=self.connection)
         queue.enqueue(say_hello)
+
+        connection_class, pool_class, pool_kwargs = parse_connection(self.connection)
         run_worker(
-            'test-worker', ['foo'], self.connection.__class__, self.connection.connection_pool.connection_kwargs.copy()
+            'test-worker', ['foo'], connection_class, pool_class, pool_kwargs
         )
         # Worker should have processed the job
         self.assertEqual(len(queue), 0)