Replace enum function with internal Enum class (#1459)

* Removed deprecated (object) inheritance
Add new py38,py39 versions to tox, removed deprecated py27,py34
Replace enum internal function with Enum class

* fix

14 files changed, 50 insertions, 58 deletions

diff --git a/rq/cli/helpers.py b/rq/cli/helpers.py
index 2e68c97..f214b00 100644
--- a/rq/cli/helpers.py
+++ b/rq/cli/helpers.py
@@ -198,7 +198,7 @@ def setup_loghandlers_from_args(verbose, quiet, date_format, log_format):
     setup_loghandlers(level, date_format=date_format, log_format=log_format)
 
 
-class CliConfig(object):
+class CliConfig:
     """A helper class to be used with click commands, to handle shared options"""
     def __init__(self, url=None, config=None, worker_class=DEFAULT_WORKER_CLASS,
                  job_class=DEFAULT_JOB_CLASS, queue_class=DEFAULT_QUEUE_CLASS,
diff --git a/rq/compat/dictconfig.py b/rq/compat/dictconfig.py
index 81e5b06..c9876da 100644
--- a/rq/compat/dictconfig.py
+++ b/rq/compat/dictconfig.py
@@ -131,7 +131,7 @@ class ConvertingTuple(tuple):
                 result.key = key
         return result
 
-class BaseConfigurator(object):
+class BaseConfigurator:
     """
     The configurator base class which defines some useful defaults.
     """
diff --git a/rq/decorators.py b/rq/decorators.py
index c86a0c5..309c09c 100644
--- a/rq/decorators.py
+++ b/rq/decorators.py
@@ -11,7 +11,7 @@ from .queue import Queue
 from .utils import backend_class
 
 
-class job(object):  # noqa
+class job:  # noqa
     queue_class = Queue
 
     def __init__(self, queue, connection=None, timeout=None,
diff --git a/rq/job.py b/rq/job.py
index ea612c7..547f12b 100644
--- a/rq/job.py
+++ b/rq/job.py
@@ -11,6 +11,7 @@ import zlib
 import asyncio
 from collections.abc import Iterable
 from distutils.version import StrictVersion
+from enum import Enum
 from functools import partial
 from uuid import uuid4
 
@@ -19,7 +20,7 @@ from .connections import resolve_connection
 from .exceptions import NoSuchJobError
 from .local import LocalStack
 from .serializers import resolve_serializer
-from .utils import (enum, get_version, import_attribute, parse_timeout, str_to_date,
+from .utils import (get_version, import_attribute, parse_timeout, str_to_date,
                     utcformat, utcnow, ensure_list)
 
 # Serialize pickle dumps using the highest pickle protocol (binary, default
@@ -27,16 +28,16 @@ from .utils import (enum, get_version, import_attribute, parse_timeout, str_to_d
 dumps = partial(pickle.dumps, protocol=pickle.HIGHEST_PROTOCOL)
 loads = pickle.loads
 
-JobStatus = enum(
-    'JobStatus',
-    QUEUED='queued',
-    FINISHED='finished',
-    FAILED='failed',
-    STARTED='started',
-    DEFERRED='deferred',
-    SCHEDULED='scheduled',
-    STOPPED='stopped',
-)
+
+class JobStatus(str, Enum):
+    QUEUED = 'queued'
+    FINISHED = 'finished'
+    FAILED = 'failed'
+    STARTED = 'started'
+    DEFERRED = 'deferred'
+    SCHEDULED = 'scheduled'
+    STOPPED = 'stopped'
+
 
 # Sentinel value to mark that some of our lazily evaluated properties have not
 # yet been evaluated.
@@ -71,7 +72,7 @@ def requeue_job(job_id, connection):
     return job.requeue()
 
 
-class Job(object):
+class Job:
     """A Job is just a convenient datastructure to pass around job (meta) data.
     """
     redis_job_namespace_prefix = 'rq:job:'
@@ -876,7 +877,7 @@ class Job(object):
 _job_stack = LocalStack()
 
 
-class Retry(object):
+class Retry:
     def __init__(self, max, interval=0):
         """`interval` can be a positive number or a list of ints"""
         super().__init__()
diff --git a/rq/local.py b/rq/local.py
index 13610ef..3e598fc 100644
--- a/rq/local.py
+++ b/rq/local.py
@@ -47,7 +47,7 @@ def release_local(local):
     local.__release_local__()
 
 
-class Local(object):
+class Local:
     __slots__ = ('__storage__', '__ident_func__')
 
     def __init__(self):
@@ -85,7 +85,7 @@ class Local(object):
             raise AttributeError(name)
 
 
-class LocalStack(object):
+class LocalStack:
     """This class works similar to a :class:`Local` but keeps a stack
     of objects instead.  This is best explained with an example::
 
@@ -172,7 +172,7 @@ class LocalStack(object):
         return len(stack)
 
 
-class LocalManager(object):
+class LocalManager:
     """Local objects cannot manage themselves. For that you need a local
     manager.  You can pass a local manager multiple locals or add them later
     by appending them to `manager.locals`.  Everytime the manager cleans up
@@ -230,7 +230,7 @@ class LocalManager(object):
         )
 
 
-class LocalProxy(object):
+class LocalProxy:
     """Acts as a proxy for a werkzeug local.  Forwards all operations to
     a proxied object.  The only operations not supported for forwarding
     are right handed operands and any kind of assignment.
diff --git a/rq/queue.py b/rq/queue.py
index 0e6afc3..cabcaf7 100644
--- a/rq/queue.py
+++ b/rq/queue.py
@@ -24,7 +24,7 @@ def compact(lst):
 
 
 @total_ordering
-class Queue(object):
+class Queue:
     job_class = Job
     DEFAULT_TIMEOUT = 180  # Default timeout seconds.
     redis_queue_namespace_prefix = 'rq:queue:'
diff --git a/rq/registry.py b/rq/registry.py
index 76cf96e..96123b1 100644
--- a/rq/registry.py
+++ b/rq/registry.py
@@ -11,7 +11,7 @@ from .queue import Queue
 from .utils import backend_class, current_timestamp
 
 
-class BaseRegistry(object):
+class BaseRegistry:
     """
     Base implementation of a job registry, implemented in Redis sorted set.
     Each job is stored as a key in the registry, scored by expiration time
diff --git a/rq/scheduler.py b/rq/scheduler.py
index dfade4c..c22aed7 100644
--- a/rq/scheduler.py
+++ b/rq/scheduler.py
@@ -4,6 +4,7 @@ import signal
 import time
 import traceback
 from datetime import datetime
+from enum import Enum
 from multiprocessing import Process
 
 from redis import Redis, SSLConnection, UnixDomainSocketConnection
@@ -13,23 +14,24 @@ from .job import Job
 from .logutils import setup_loghandlers
 from .queue import Queue
 from .registry import ScheduledJobRegistry
-from .utils import current_timestamp, enum
+from .utils import current_timestamp
 
 SCHEDULER_KEY_TEMPLATE = 'rq:scheduler:%s'
 SCHEDULER_LOCKING_KEY_TEMPLATE = 'rq:scheduler-lock:%s'
 
 
-class RQScheduler(object):
+class SchedulerStatus(str, Enum):
+    STARTED = 'started'
+    WORKING = 'working'
+    STOPPED = 'stopped'
+
+
+class RQScheduler:
     # STARTED: scheduler has been started but sleeping
     # WORKING: scheduler is in the midst of scheduling jobs
     # STOPPED: scheduler is in stopped condition
 
-    Status = enum(
-        'SchedulerStatus',
-        STARTED='started',
-        WORKING='working',
-        STOPPED='stopped'
-    )
+    Status = SchedulerStatus
 
     def __init__(self, queues, connection, interval=1, logging_level=logging.INFO,
                  date_format=DEFAULT_LOGGING_DATE_FORMAT,
diff --git a/rq/timeouts.py b/rq/timeouts.py
index 3f9ac5b..f995443 100644
--- a/rq/timeouts.py
+++ b/rq/timeouts.py
@@ -24,7 +24,7 @@ class HorseMonitorTimeoutException(BaseTimeoutException):
     pass
 
 
-class BaseDeathPenalty(object):
+class BaseDeathPenalty:
     """Base class to setup job timeouts."""
 
     def __init__(self, timeout, exception=JobTimeoutException, **kwargs):
diff --git a/rq/utils.py b/rq/utils.py
index 2686f52..284286b 100644
--- a/rq/utils.py
+++ b/rq/utils.py
@@ -24,7 +24,7 @@ from .compat import as_text, is_python_version, string_types
 from .exceptions import TimeoutFormatError
 
 
-class _Colorizer(object):
+class _Colorizer:
     def __init__(self):
         esc = "\x1b["
 
@@ -234,16 +234,6 @@ def current_timestamp():
     return calendar.timegm(datetime.datetime.utcnow().utctimetuple())
 
 
-def enum(name, *sequential, **named):
-    values = dict(zip(sequential, range(len(sequential))), **named)
-
-    # NOTE: Yes, we *really* want to cast using str() here.
-    # On Python 2 type() requires a byte string (which is str() on Python 2).
-    # On Python 3 it does not matter, so we'll use str(), which acts as
-    # a no-op.
-    return type(str(name), (), values)
-
-
 def backend_class(holder, default_name, override=None):
     """Get a backend class using its default attribute name or an override"""
     if override is None:
diff --git a/rq/worker.py b/rq/worker.py
index e211766..d9dd977 100644
--- a/rq/worker.py
+++ b/rq/worker.py
@@ -15,6 +15,7 @@ import warnings
 
 from datetime import datetime, timedelta, timezone
 from distutils.version import StrictVersion
+from enum import Enum
 from uuid import uuid4
 from random import shuffle
 
@@ -41,7 +42,7 @@ 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, get_version,
+from .utils import (backend_class, ensure_list, get_version,
                     make_colorizer, utcformat, utcnow, utcparse)
 from .version import VERSION
 from .worker_registration import clean_worker_registry, get_keys
@@ -87,16 +88,14 @@ def signal_name(signum):
         return 'SIG_UNKNOWN'
 
 
-WorkerStatus = enum(
-    'WorkerStatus',
-    STARTED='started',
-    SUSPENDED='suspended',
-    BUSY='busy',
-    IDLE='idle'
-)
+class WorkerStatus(str, Enum):
+    STARTED = 'started'
+    SUSPENDED = 'suspended'
+    BUSY = 'busy'
+    IDLE = 'idle'
 
 
-class Worker(object):
+class Worker:
     redis_worker_namespace_prefix = 'rq:worker:'
     redis_workers_keys = worker_registration.REDIS_WORKER_KEYS
     death_penalty_class = UnixSignalDeathPenalty
diff --git a/tests/fixtures.py b/tests/fixtures.py
index dd2218a..0103daf 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -121,7 +121,7 @@ def echo(*args, **kwargs):
     return args, kwargs
 
 
-class Number(object):
+class Number:
     def __init__(self, value):
         self.value = value
 
@@ -133,12 +133,12 @@ class Number(object):
         return self.value / y
 
 
-class CallableObject(object):
+class CallableObject:
     def __call__(self):
         return u"I'm callable"
 
 
-class UnicodeStringObject(object):
+class UnicodeStringObject:
     def __repr__(self):
         return u'é'
 
@@ -203,7 +203,7 @@ def run_dummy_heroku_worker(sandbox, _imminent_shutdown_delay):
     w.main_work_horse(None, None)
 
 
-class DummyQueue(object):
+class DummyQueue:
     pass
 
 
@@ -217,7 +217,7 @@ def kill_worker(pid, double_kill, interval=0.5):
         os.kill(pid, signal.SIGTERM)
 
 
-class Serializer(object):
+class Serializer:
     def loads(self): pass
 
     def dumps(self): pass
diff --git a/tests/test_sentry.py b/tests/test_sentry.py
index 085b086..2514325 100644
--- a/tests/test_sentry.py
+++ b/tests/test_sentry.py
@@ -15,7 +15,7 @@ import mock
 from click.testing import CliRunner
 
 
-class FakeSentry(object):
+class FakeSentry:
     servers = []
 
     def captureException(self, *args, **kwds):  # noqa
diff --git a/tox.ini b/tox.ini
index b1d2ed7..344eb9a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist=py27,py34,py35,py36,py37,pypy,flake8
+envlist=py35,py36,py37,py38,py39,pypy,flake8
 
 [testenv]
 commands=pytest --cov rq --durations=5 {posargs}