Implement fact cache flushing alongside a command-line argument to invoke it.

lib/ansible/cache/__init__.py

@@ -50,10 +50,12 @@ class FactCache(MutableMapping):
         return len(self._plugin.keys())
 
     def copy(self):
-        """
-        Return a primitive copy of the keys and values from the cache.
-        """
+        """ Return a primitive copy of the keys and values from the cache. """
         return dict([(k, v) for (k, v) in self.iteritems()])
 
     def keys(self):
         return self._plugin.keys()
+
+    def flush(self):
+        """ Flush the fact cache of all keys. """
+        self._plugin.flush()

lib/ansible/cache/base.py

@@ -13,3 +13,6 @@ class BaseCacheModule(object):
 
     def delete(self, key):
         raise NotImplementedError("Subclasses of {} must implement the '{}' method".format(self.__class__.__name__, self.__name__))
+
+    def flush(self):
+        raise NotImplementedError("Subclasses of {} must implement the '{}' method".format(self.__class__.__name__, self.__name__))

lib/ansible/cache/file.py

@@ -47,13 +47,13 @@ class CacheModule(MemoryCacheModule):
 
     def set(self, *args, **kwargs):
         super(CacheModule, self).set(*args, **kwargs)
-        self.flush()
+        self.fsync()
 
     def delete(self, *args, **kwargs):
         super(CacheModule, self).delete(*args, **kwargs)
-        self.flush()
+        self.fsync()
 
-    def flush(self):
+    def fsync(self):
         temp = tempfile.TemporaryFile('r+b')
 
         try:
@@ -63,3 +63,7 @@ class CacheModule(MemoryCacheModule):
                 shutil.copyfileobj(temp, f)
         finally:
             temp.close()
+
+    def flush(self):
+        super(CacheModule, self).flush()
+        self.fsync()

lib/ansible/cache/memcached.py

@@ -110,3 +110,7 @@ class CacheModule(BaseCacheModule):
     def delete(self, key):
         self._cache.delete(self._make_key(key))
         self._keys.discard(key)
+
+    def flush(self):
+        for key in self.keys():
+            self.delete(key)

lib/ansible/cache/memory.py

@@ -35,3 +35,6 @@ class CacheModule(object):
 
     def delete(self, key):
         del self._cache[key]
+
+    def flush(self):
+        self._cache = {}

lib/ansible/cache/redis.py

@@ -106,3 +106,7 @@ class CacheModule(BaseCacheModule):
     def delete(self, key):
         self._cache.delete(self._make_key(key))
         self._cache.zrem(self._keys_set, key)
+
+    def flush(self):
+        for key in self.keys():
+            self.delete(key)