update pylint version, and fix linter issues

.pylintrc

@@ -12,7 +12,6 @@ ignore=
 
 disable=
     attribute-defined-outside-init,
-    bad-continuation,
     bad-mcs-classmethod-argument,
     bare-except,
     broad-except,
@@ -25,12 +24,10 @@ disable=
     import-self,
     inconsistent-return-statements,
     invalid-name,
-    misplaced-comparison-constant,
     missing-docstring,
     no-else-return,
     no-member,
     no-self-argument,
-    no-self-use,
     no-staticmethod-decorator,
     not-callable,
     protected-access,
@@ -53,3 +50,6 @@ disable=
     useless-import-alias,
     comparison-with-callable,
     try-except-raise,
+    consider-using-with,
+    consider-using-f-string,
+    unspecified-encoding

gunicorn/config.py

@@ -1510,7 +1510,8 @@ class LogConfigDict(Setting):
 
     Format: https://docs.python.org/3/library/logging.config.html#logging.config.dictConfig
 
-    For more context you can look at the default configuration dictionary for logging, which can be found at ``gunicorn.glogging.CONFIG_DEFAULTS``.
+    For more context you can look at the default configuration dictionary for logging,
+    which can be found at ``gunicorn.glogging.CONFIG_DEFAULTS``.
 
     .. versionadded:: 19.8
     """
@@ -1993,6 +1994,7 @@ def on_exit(server):
         The callable needs to accept a single instance variable for the Arbiter.
         """
 
+
 class NewSSLContext(Setting):
     name = "ssl_context"
     section = "Server Hooks"
@@ -2027,6 +2029,7 @@ def ssl_context(conf, default_ssl_context_factory):
         .. versionadded:: 20.2
         """
 
+
 class ProxyProtocol(Setting):
     name = "proxy_protocol"
     section = "Server Mechanics"

gunicorn/glogging.py

@@ -45,12 +45,11 @@
     "local7": 23
 }
 
-CONFIG_DEFAULTS = dict(
-    version=1,
-    disable_existing_loggers=False,
-
-    root={"level": "INFO", "handlers": ["console"]},
-    loggers={
+CONFIG_DEFAULTS = {
+    "version": 1,
+    "disable_existing_loggers": False,
+    "root": {"level": "INFO", "handlers": ["console"]},
+    "loggers": {
         "gunicorn.error": {
             "level": "INFO",
             "handlers": ["error_console"],
@@ -65,7 +64,7 @@
             "qualname": "gunicorn.access"
         }
     },
-    handlers={
+    "handlers": {
         "console": {
             "class": "logging.StreamHandler",
             "formatter": "generic",
@@ -77,14 +76,14 @@
             "stream": "ext://sys.stderr"
         },
     },
-    formatters={
+    "formatters": {
         "generic": {
             "format": "%(asctime)s [%(process)d] [%(levelname)s] %(message)s",
             "datefmt": "[%Y-%m-%d %H:%M:%S %z]",
             "class": "logging.Formatter"
         }
     }
-)
+}
 
 
 def loggers():
@@ -418,7 +417,7 @@ def _set_handler(self, log, output, fmt, stream=None):
             if output == "-":
                 h = logging.StreamHandler(stream)
             else:
-                util.check_is_writeable(output)
+                util.check_is_writable(output)
                 h = logging.FileHandler(output)
                 # make sure the user can reopen the file
                 try:

gunicorn/http/wsgi.py

@@ -12,7 +12,7 @@
 from gunicorn.http.message import HEADER_RE
 from gunicorn.http.errors import InvalidHeader, InvalidHeaderName
 from gunicorn import SERVER_SOFTWARE, SERVER
-import gunicorn.util as util
+from gunicorn import util
 
 # Send files in at most 1GB blocks as some operating systems can have problems
 # with sending files in blocks over 2GB.

gunicorn/sock.py

@@ -204,13 +204,15 @@ def create_sockets(conf, log, fds=None):
 
     return listeners
 
+
 def close_sockets(listeners, unlink=True):
     for sock in listeners:
         sock_name = sock.getsockname()
         sock.close()
         if unlink and _sock_type(sock_name) is UnixSocket:
             os.unlink(sock_name)
 
+
 def ssl_context(conf):
     def default_ssl_context_factory():
         context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH, cafile=conf.ca_certs)
@@ -222,7 +224,9 @@ def default_ssl_context_factory():
 
     return conf.ssl_context(conf, default_ssl_context_factory)
 
+
 def ssl_wrap_socket(sock, conf):
-    return ssl_context(conf).wrap_socket(sock, server_side=True,
-        suppress_ragged_eofs=conf.suppress_ragged_eofs,
-        do_handshake_on_connect=conf.do_handshake_on_connect)
+    return ssl_context(conf).wrap_socket(sock,
+                                         server_side=True,
+                                         suppress_ragged_eofs=conf.suppress_ragged_eofs,
+                                         do_handshake_on_connect=conf.do_handshake_on_connect)

gunicorn/util.py

@@ -562,12 +562,12 @@ def seed():
         random.seed('%s.%s' % (time.time(), os.getpid()))
 
 
-def check_is_writeable(path):
+def check_is_writable(path):
     try:
-        f = open(path, 'a')
+        with open(path, 'a') as f:
+            f.close()
     except IOError as e:
         raise RuntimeError("Error: '%s' isn't writable [%r]" % (path, e))
-    f.close()
 
 
 def to_bytestring(value, encoding="utf8"):

gunicorn/workers/base_async.py

@@ -9,10 +9,10 @@
 import ssl
 import sys
 
-import gunicorn.http as http
-import gunicorn.http.wsgi as wsgi
-import gunicorn.util as util
-import gunicorn.workers.base as base
+from gunicorn import http
+from gunicorn.http import wsgi
+from gunicorn import util
+from gunicorn.workers import base
 
 ALREADY_HANDLED = object()
 

gunicorn/workers/geventlet.py

@@ -173,6 +173,7 @@ def run(self):
             eventlet.sleep(1.0)
 
         self.notify()
+        t = None
         try:
             with eventlet.Timeout(self.cfg.graceful_timeout) as t:
                 for a in acceptors:

gunicorn/workers/ggevent.py

@@ -59,7 +59,7 @@ def run(self):
         ssl_args = {}
 
         if self.cfg.is_ssl:
-            ssl_args = dict(ssl_context=ssl_context(self.cfg))
+            ssl_args = {"ssl_context": ssl_context(self.cfg)}
 
         for s in self.sockets:
             s.setblocking(1)

gunicorn/workers/gthread.py

@@ -11,7 +11,7 @@
 # closed.
 # pylint: disable=no-else-break
 
-import concurrent.futures as futures
+from concurrent import futures
 import errno
 import os
 import selectors
@@ -124,7 +124,7 @@ def accept(self, server, listener):
             conn = TConn(self.cfg, sock, client, server)
             # set timeout to ensure it will not be in the loop too long
             conn.set_timeout()
-            
+
             self.nr_conns += 1
             # wait until socket is readable
             with self._lock:

gunicorn/workers/gtornado.py

@@ -3,7 +3,6 @@
 # This file is part of gunicorn released under the MIT license.
 # See the NOTICE for more information.
 
-import copy
 import os
 import sys
 
@@ -112,7 +111,7 @@ def run(self):
                     isinstance(app, tornado.wsgi.WSGIApplication):
                 app = WSGIContainer(app)
         elif not isinstance(app, WSGIContainer) and \
-        not isinstance(app, tornado.web.Application):
+                not isinstance(app, tornado.web.Application):
             app = WSGIContainer(app)
 
         # Monkey-patching HTTPConnection.finish to count the

gunicorn/workers/sync.py

@@ -12,11 +12,11 @@
 import ssl
 import sys
 
-import gunicorn.http as http
-import gunicorn.http.wsgi as wsgi
-import gunicorn.sock as sock
-import gunicorn.util as util
-import gunicorn.workers.base as base
+from gunicorn import http
+from gunicorn.http import wsgi
+from gunicorn import sock
+from gunicorn import util
+from gunicorn.workers import base
 
 
 class StopWaiting(Exception):

tests/test_arbiter.py

@@ -4,7 +4,7 @@
 # See the NOTICE for more information.
 
 import os
-import unittest.mock as mock
+from unittest import mock
 
 import gunicorn.app.base
 import gunicorn.arbiter

tests/test_http.py

@@ -3,7 +3,7 @@
 import io
 import t
 import pytest
-import unittest.mock as mock
+from unittest import mock
 
 from gunicorn import util
 from gunicorn.http.body import Body, LengthReader, EOFReader

tests/test_pidfile.py

@@ -4,7 +4,7 @@
 # See the NOTICE for more information.
 
 import errno
-import unittest.mock as mock
+from unittest import mock
 
 import gunicorn.pidfile
 

tests/test_sock.py

@@ -3,7 +3,7 @@
 # This file is part of gunicorn released under the MIT license.
 # See the NOTICE for more information.
 
-import unittest.mock as mock
+from unittest import mock
 
 from gunicorn import sock
 

tests/test_ssl.py

@@ -8,7 +8,7 @@
 import pytest
 
 from gunicorn.config import (
-    KeyFile, CertFile, SSLVersion, CACerts, SuppressRaggedEOFs,
+    KeyFile, CertFile, CACerts, SuppressRaggedEOFs,
     DoHandshakeOnConnect, Setting, Ciphers,
 )
 

tests/test_systemd.py

@@ -5,7 +5,7 @@
 
 from contextlib import contextmanager
 import os
-import unittest.mock as mock
+from unittest import mock
 
 import pytest
 

tox.ini

@@ -12,6 +12,7 @@ deps =
 [testenv:lint]
 commands =
   pylint -j0 \
+    --max-line-length=120 \
     gunicorn \
     tests/test_arbiter.py \
     tests/test_config.py \
@@ -26,7 +27,7 @@ commands =
     tests/test_util.py \
     tests/test_valid_requests.py
 deps =
-  pylint<2.7
+  pylint=2.17.4
 
 [testenv:docs-lint]
 allowlist_externals =