比较配置和缓存时间

run.py

@@ -25,7 +25,8 @@ def get_config(key=None, default=None, path="config.json"):
         try:
             with open(path) as configfile:
                 get_config.config = json.load(configfile)
-        except IOError:
+                get_config.time = os.stat(path).st_mtime
+        except Exception:
             exit('fail to load config from file: %s' % path)
     if key:
         return get_config.config.get(key, default)
@@ -45,7 +46,6 @@ def update_ip(ip_type, cache, dns):
     index = get_config('index' + ip_type) or "default"
     if str(index).isdigit():
         value = getattr(ip, "local_v" + ip_type)(index)
-
     else:
         value = getattr(ip, index + "_v" + ip_type)()
 
@@ -68,6 +68,7 @@ def main():
     parser = argparse.ArgumentParser()
     parser.add_argument('-c', default="config.json")
     get_config(path=parser.parse_args().c)
+
     if get_config('dns', 'dnspod').startswith('ali'):
         dns = alidns
     else:
@@ -77,7 +78,8 @@ def main():
     ip.DEBUG = get_config('debug')
 
     cache = Cache(CACHE_FILE)
-    if len(cache) < 1:
+    if len(cache) < 1 or get_config.time >= cache.time:
+        cache.clear()
         print "=" * 25 + " " + time.ctime() + " " + "=" * 25
 
     update_ip('4', cache, dns)

util/cache.py

@@ -25,6 +25,7 @@ class Cache(MutableMapping):
         self.__data = {}
         self.__filename = path
         self.__sync = sync
+        self.__time = time.time()
         self.__changed = False
         self.load()
 
@@ -72,6 +73,7 @@ class Cache(MutableMapping):
             with open(self.__filename, 'w') as data:
                 pickle.dump(self.__data, data)
                 LOG.debug('save cache data to %s', self.__filename)
+            self.__time = time.time()
             self.__changed = False
         return self
 
@@ -86,19 +88,27 @@ class Cache(MutableMapping):
         del self.__time
         self.__sync = False
 
+    def __update(self):
+        self.__changed = True
+        if self.__sync:
+            self.sync()
+        else:
+            self.__time = time.time()
+
+    def clear(self):
+        if self.data():
+            self.__data = {}
+            self.__update()
+
     def __setitem__(self, key, value):
         if self.data(key) != value:
             self.__data[key] = value
-            self.__changed = True
-            if self.__sync:
-                self.sync()
+            self.__update()
 
     def __delitem__(self, key):
         if key in self.data():
             del self.__data[key]
-            self.__changed = True
-            if self.__sync:
-                self.sync()
+            self.__update()
 
     def __getitem__(self, key):
         return self.data(key)
@@ -125,13 +135,11 @@ def main():
     test
     """
     LOG.basicConfig(level=LOG.DEBUG)
-    # LOG.debug('test log')
     cache = Cache('test.txt')
-    cache['s'] = ['a', 's']
     print cache
-    print cache['s']
     print cache.time
-    cache['t'] = '哈哈'
+    cache['s'] = 'a'
+    print cache['s']
     print cache.time