mock_period.py

import etcd
import time

class CachedToken(object)
    TTL = 90*86400
    key = '/eventlogging/ip_hash'
    def __init__(self, ...):
        self.c = etcd.Client(..)
        self.get()
        
    def get(self):
        try:
            res = self.c.read(key)
        except etcd.EtcdKeyNotFound:
            res = self._set()
        self.last_valid = time.time() + res.ttl
        self._key = res.value

    @property
    def token(self):
        t = time.time()
        if self.last_valid < t:
            self.get()
        return self._key

    def _set(self):
        token = some_random_func()
        try:
            self.c.write(key, token, ttl=self.TTL, prevExist=False)
        except etcd.EtcdAlreadyExist as e:
            pass
        return self.c.read(key)