initial

lib/__init__.py

@@ -0,0 +1,24 @@
+def ip_in_net(ip, network):
+    ipaddr = int(''.join(['%02x' % int(x) for x in ip.split('.')]), 16)
+    netaddr, bits = network.split('/')
+    netmask = int(''.join(['%02x' % int(x) for x in netaddr.split('.')]), 16)
+    mask = (0xffffffff << (32 - int(bits))) & 0xffffffff
+    return (ipaddr & mask) == (netmask & mask)
+
+
+def human_size(num, suffix=''):
+    for unit in ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z']:
+        if abs(num) < 1024.0:
+            return "%3.1f %s%s" % (num, unit, suffix)
+        num /= 1024.0
+    return "%.1f%s%s" % (num, 'Yi', suffix)
+
+
+class FactoryMixin:
+    _instance = None
+
+    @classmethod
+    def factory(cls, *args, **kwargs):
+        if not cls._instance:
+            cls._instance = cls(*args, **kwargs)
+        return cls._instance