Merge pull request #225 from yandy/master

use official cached_property when possible

.travis.yml

@@ -6,6 +6,7 @@ python:
 - '3.6'
 - '3.7'
 - '3.8'
+- '3.9'
 install:
 - pip install -U importlib-metadata
 - pip list

CHANGELOG.md

@@ -1,6 +1,8 @@
 # CHANGELOG
 
 ## [Unreleased]
+### Changed
+- Use cached_property from standard lib when possible
 
 ## [2.3.3] - 2022-04-22
 ### Added
@@ -49,4 +51,4 @@
 ### Changed
 - update travis ci
 
-## [0.3.0] - 2017-08-16
+## [0.3.0] - 2017-08-16

docs/utils.md

@@ -13,6 +13,9 @@ utils.import_string('sea.app:BaseApp')
 
 ## `cached_property`
 
+> 如果你使用的是 python 3.8 以上版本，标准库中已经提供 cached_property 装饰器，推荐使用官方版本
+> `from functools import cached_property`
+
 property 的值初次计算后会缓存在 instance 上，重复调用不会重复计算
 
 ```python

sea/app.py

@@ -1,11 +1,17 @@
 import inspect
 import logging
 import os.path
+import sys
 
 from sea import exceptions, utils
 from sea.config import Config, ConfigAttribute
 from sea.datatypes import ImmutableDict, ConstantsObject
 
+if sys.version_info.minor >= 8:
+    from functools import cached_property
+else:
+    from sea.utils import cached_property
+
 
 class BaseApp:
     """The BaseApp object implements grpc application
@@ -46,7 +52,7 @@ def __init__(self, root_path, env):
         self._extensions = {}
         self._middlewares = []
 
-    @utils.cached_property
+    @cached_property
     def logger(self):
         logger = logging.getLogger('sea.app')
         if self.debug and logger.level == logging.NOTSET:
@@ -57,19 +63,19 @@ def logger(self):
             logger.addHandler(h)
         return logger
 
-    @utils.cached_property
+    @cached_property
     def servicers(self):
         rv = ConstantsObject(self._servicers)
         del self._servicers
         return rv
 
-    @utils.cached_property
+    @cached_property
     def extensions(self):
         rv = ConstantsObject(self._extensions)
         del self._extensions
         return rv
 
-    @utils.cached_property
+    @cached_property
     def middlewares(self):
         rv = tuple(self._middlewares)
         del self._middlewares