get_redis_server_version() should handle 4 digit version numbers (#1322)

rq/job.py

@@ -18,7 +18,7 @@ from .connections import resolve_connection
 from .exceptions import NoSuchJobError
 from .local import LocalStack
 from .serializers import resolve_serializer
-from .utils import (enum, import_attribute, parse_timeout, str_to_date,
+from .utils import (enum, get_version, import_attribute, parse_timeout, str_to_date,
                     utcformat, utcnow)
 
 # Serialize pickle dumps using the highest pickle protocol (binary, default
@@ -590,9 +590,7 @@ class Job(object):
     def get_redis_server_version(self):
         """Return Redis server version of connection"""
         if not self.redis_server_version:
-            self.redis_server_version = StrictVersion(
-                self.connection.info("server")["redis_version"]
-            )
+            self.redis_server_version = get_version(self.connection)
 
         return self.redis_server_version
 

rq/queue.py

@@ -15,7 +15,7 @@ from .defaults import DEFAULT_RESULT_TTL
 from .exceptions import DequeueTimeout, NoSuchJobError
 from .job import Job, JobStatus
 from .serializers import resolve_serializer
-from .utils import backend_class, import_attribute, parse_timeout, utcnow
+from .utils import backend_class, get_version, import_attribute, parse_timeout, utcnow
 
 
 def compact(lst):
@@ -92,10 +92,7 @@ class Queue(object):
     def get_redis_server_version(self):
         """Return Redis server version of connection"""
         if not self.redis_server_version:
-            self.redis_server_version = StrictVersion(
-                self.connection.info("server")["redis_version"]
-            )
-
+            self.redis_server_version = get_version(self.connection)
         return self.redis_server_version
 
     @property

rq/utils.py

@@ -14,10 +14,9 @@ import importlib
 import logging
 import numbers
 import sys
-try:
-    from collections.abc import Iterable
-except ImportError:
+
 from collections import Iterable
+from distutils.version import StrictVersion
 
 from .compat import as_text, is_python_version, string_types
 from .exceptions import TimeoutFormatError
@@ -248,3 +247,12 @@ def parse_timeout(timeout):
                                          'such as "1h", "23m".')
 
     return timeout
+
+
+def get_version(connection):
+    """
+    Return StrictVersion of Redis server version.
+    This function also correctly handles 4 digit redis server versions.
+    """
+    version_string = connection.info("server")["redis_version"]
+    return StrictVersion('.'.join(version_string.split('.')[:3]))

rq/worker.py

@@ -39,7 +39,7 @@ from .registry import FailedJobRegistry, StartedJobRegistry, clean_registries
 from .scheduler import RQScheduler
 from .suspension import is_suspended
 from .timeouts import JobTimeoutException, HorseMonitorTimeoutException, UnixSignalDeathPenalty
-from .utils import (backend_class, ensure_list, enum,
+from .utils import (backend_class, ensure_list, enum, get_version,
                     make_colorizer, utcformat, utcnow, utcparse)
 from .version import VERSION
 from .worker_registration import clean_worker_registry, get_keys
@@ -223,10 +223,7 @@ class Worker(object):
     def get_redis_server_version(self):
         """Return Redis server version of connection"""
         if not self.redis_server_version:
-            self.redis_server_version = StrictVersion(
-                self.connection.info("server")["redis_version"]
-            )
-
+            self.redis_server_version = get_version(self.connection)
         return self.redis_server_version
 
     def validate_queues(self):

tests/test_utils.py

@@ -3,8 +3,14 @@ from __future__ import (absolute_import, division, print_function,
                         unicode_literals)
 import re
 import datetime
+import mock
+
+from distutils.version import StrictVersion
+
+from redis import Redis
+
 from tests import RQTestCase, fixtures
-from rq.utils import parse_timeout, first, is_nonstring_iterable, ensure_list, utcparse, backend_class
+from rq.utils import backend_class, ensure_list, first, get_version, is_nonstring_iterable, parse_timeout, utcparse
 from rq.exceptions import TimeoutFormatError
 
 
@@ -66,3 +72,20 @@ class TestUtils(RQTestCase):
         self.assertEqual(fixtures.DummyQueue, backend_class(fixtures, 'DummyQueue', override=fixtures.DummyQueue))
         self.assertEqual(fixtures.DummyQueue,
                          backend_class(fixtures, 'DummyQueue', override='tests.fixtures.DummyQueue'))
+
+    def test_get_redis_version(self):
+        """Ensure get_version works properly"""
+        redis = Redis()
+        self.assertTrue(isinstance(get_version(redis), StrictVersion))
+
+        # Parses 3 digit version numbers correctly
+        class DummyRedis(Redis):
+            def info(*args):
+                return {'redis_version': '4.0.8'}
+        self.assertEqual(get_version(DummyRedis()), StrictVersion('4.0.8'))
+
+        # Parses 3 digit version numbers correctly
+        class DummyRedis(Redis):
+            def info(*args):
+                return {'redis_version': '3.0.7.9'}
+        self.assertEqual(get_version(DummyRedis()), StrictVersion('3.0.7'))