1 files changed, 53 insertions, 0 deletions
diff --git a/module/network/Bucket.py b/module/network/Bucket.py
new file mode 100644
index 000000000..35e27bcd4
--- /dev/null
+++ b/module/network/Bucket.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+"""
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License,
+    or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+    See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, see <http://www.gnu.org/licenses/>.
+    
+    @author: mkaay
+"""
+
+from time import time, sleep
+from threading import Lock
+
+class Bucket:
+    def __init__(self):
+        self.content = 0
+        self.rate = 0
+        self.lastDrip = time()
+        self.lock = Lock()
+    
+    def setRate(self, rate):
+        self.lock.acquire()
+        self.rate = rate
+        self.lock.release()
+    
+    def add(self, amount):
+        self.lock.acquire()
+        self.drip()
+        allowable = min(amount, self.rate - self.content)
+        if allowable > 0:
+            sleep(0.005) #@XXX: high sysload without?!
+
+        self.content += allowable
+        self.lock.release()
+        return allowable
+
+    def drip(self):
+        if self.rate == 0:
+            self.content = 0
+        else:
+            now = time()
+            deltaT = now - self.lastDrip
+            self.content = long(max(0, self.content - deltaT * self.rate))
+            self.lastDrip = now