diff --git a/f7/__init__.py b/f7/__init__.py
index 3529911..1bf49cf 100644
--- a/f7/__init__.py
+++ b/f7/__init__.py
@@ -12,3 +12,23 @@ timer = i_timer()
 
 def isOnlineEnv():
     return not os.getenv("SERVER_ENV");
+
+def scanRedisKey(conn, pattern):
+    result = {}
+    cursor, keys = conn.scan(0, pattern, 1000)
+    while cursor != 0 or len(keys) > 0:
+        for key in keys:
+            if key in result:
+                result[key] += result[key]
+            else:
+                result[key] = 0
+        keys = []
+        if cursor != 0:
+            cursor, keys = conn.scan(cursor, pattern, 1000)
+    return result
+
+def getChannelByAccountId(account_id):
+    tmp_strings = account_id.split('_')
+    if len(tmp_strings) < 3:
+        return 0
+    return tmp_strings[0]
diff --git a/f7/app.py b/f7/app.py
index 23d2df3..b113d36 100644
--- a/f7/app.py
+++ b/f7/app.py
@@ -42,6 +42,9 @@ class _App:
     def callAt(self, when, callback):
         tornado.ioloop.IOLoop.current().call_at(when, callback)
 
+    def callLater(self, when, callback):
+        tornado.ioloop.IOLoop.current().call_later(when, callback)
+
     def registerHandler(self, c, a, callback):
         self._requestHandler[c + '$' + a] = callback
 
diff --git a/f7/timer.py b/f7/timer.py
index 01f4646..b92697e 100644
--- a/f7/timer.py
+++ b/f7/timer.py
@@ -18,5 +18,8 @@ class _Timer:
     def callAt(self, when, callback):
         f7.app.callAt(when, callback)
 
+    def callLater(self, when, callback):
+        f7.app.callLater(when, callback)
+
 def instance():
     return _Timer.instance()