utils.py

   1 #!/usr/bin/env python2
   2 # vim:fileencoding=utf-8
   3
   4 import re
   5 import unicodedata
   6 import time
   7 import config
   8
   9 from google.appengine.api import memcache
  10
  11 timeParser = re.compile(r'^(\d+)([smhd])?$')
  12 linkre = re.compile(r' <https?://(?!i.imgur.com/)[^>]+>')
  13 linkjsre = re.compile(r' <javascript:[^>]+>')
  14 timeUnitMap = {
  15   '':  1,
  16   's': 1,
  17   'm': 60,
  18   'h': 3600,
  19   'd': 86400,
  20 }
  21 timeZhUnitMap = (60, 60, 24, 36524)
  22 timeZhUnits = (u'秒', u'分', u'小时', u'天')
  23
  24 def filesize(size):
  25   '''将 数字 转化为 xxKiB 的形式'''
  26   units = 'KMGT'
  27   left = abs(size)
  28   unit = -1
  29   while left > 1100 and unit < 3:
  30     left = left / 1024
  31     unit += 1
  32   if unit == -1:
  33     return '%dB' % size
  34   else:
  35     if size < 0:
  36       left = -left
  37     return '%.1f%siB' % (left, units[unit])
  38
  39 def strftime(time, timezone, show_date=False):
  40   '''将时间转换为字符串，考虑时区，可能带日期'''
  41   if not show_date:
  42     format = '%H:%M:%S'
  43   else:
  44     format = '%m-%d %H:%M:%S'
  45   return (time + timezone).strftime(format)
  46
  47 def parseTime(s):
  48   '''将 3s，5d，1h，6m 等转换成秒数'''
  49   m = timeParser.match(s)
  50   if m is None:
  51     raise ValueError('not a time')
  52   n = int(m.group(1))
  53   u = m.group(2)
  54   if u is None:
  55     return n
  56   else:
  57     return n * timeUnitMap[u]
  58
  59 def displayTime(t):
  60   '''友好地显示时间'''
  61   r = []
  62   for i in timeZhUnitMap:
  63     r.append(t % i)
  64     t = t // i
  65     if t == 0:
  66       break
  67   return u''.join(reversed(map(lambda x, y: unicode(x)+y if x else u'', r, timeZhUnits)))
  68
  69 def checkNick(nick):
  70   '''判断一个昵称是否合法'''
  71   if len(nick.encode('utf-8')) > config.nick_maxlen:
  72     return False
  73   for i in nick:
  74     cat = unicodedata.category(i)
  75     # Lt & Lm are special chars
  76     if (not cat.startswith('L') or cat in ('Lm', 'Lt')) \
  77        and i not in config.allowedSymbolInNick:
  78       return False
  79   return True
  80
  81 def removelinks(msg):
  82   '''清除多余的链接文本'''
  83   links = linkre.findall(msg)
  84   if len(links) != 1:
  85     msg = linkre.sub('', msg)
  86   msg = linkjsre.sub('', msg)
  87   return msg
  88
  89 class MemLock:
  90   def __init__(self, name):
  91     self.name = name
  92
  93   def require(self):
  94     while memcache.get(self.name):
  95       time.sleep(0.001)
  96     memcache.set(self.name, True)
  97
  98   def release(self):
  99     memcache.set(self.name, False)