sanhaolu_cron.py

@sched_base.scheduled_job('interval', minutes=1 if settings.DEBUG else 5)
def expire_cached_static_files_hash():
    u"""当有静态文件发生变化时，使redis中缓存的hash值失效"""
    
    import re
    
    p = r'?v=([a-f0-9]{32})'
    
    html = str(g.render.macro('default/index.html').cache())
    hashes_now = sorted(re.findall(p, html) or [])
    
    if not hashes_now:
        return
    
    k = settings.RDS_KS.K_CACHED_STATIC_FILE_TEMPLATES # 'sanhaolu:cache:static_files:hash'
    h = g.rds.get(k) or ''
    hashes_in_cache = sorted(re.findall(p, h) or [])
    
    if (not hashes_in_cache) or (hashes_now == hashes_in_cache):
        return
    
    g.rds.delete(k)
    logger.info('Cached files expired.')
    # 还可以在这里urllib2.urlopen('http://localhost:8888').read()主动产生新的缓存，
    # 也可以等下一个倒霉的用户访问时自动产生。