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import redis |
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class Cache: |
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''' in memory cache''' |
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__redis = None |
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isonline = False |
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def __init__(self, servicelogin): |
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self.encoding = 'utf-8' |
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self.__redis = redis.Redis(host=servicelogin.host, port=servicelogin.port, password=servicelogin.password) |
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self.isonline = True |
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def iskeyexists(self, key): |
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'''true when key exists in cache''' |
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return self.__redis.exists(key) |
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def get(self, key): |
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'''get value from key''' |
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try: |
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return self.__redis.get(key) |
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except redis.exceptions.ConnectionError as ex: |
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self.isonline = False |
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raise ex |
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def getlist(self, key): |
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'''get a list from key''' |
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return self.__redis.lrange(key, 0, -1) |
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def put(self, key, value): |
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'''store a value into key''' |
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self.__redis.set(key, value) |
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def putinhashset(self, name, key, value): |
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'''store value into key at name''' |
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if not isinstance(value, str): |
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raise ValueError('hashset value must be a string') |
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self.__redis.hset(name, key, value) |
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def getfromhashset(self, name, key): |
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'''get value in hashset''' |
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return self.__redis.hget(name, key) |
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def gethashset(self, name): |
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'''this will return keys and values from hashset''' |
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output = {} |
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hashitems = self.__redis.hgetall(name) |
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for key, value in hashitems.items(): |
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output[key.decode(self.encoding)] = value.decode(self.encoding) |
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return output |
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def set(self, key, value): |
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'''save value to cache key''' |
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self.__redis.set(key, value) |
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def delete(self, key): |
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'''remove key''' |
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self.__redis.delete(key) |
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def hdel(self, name, key): |
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'''remove key''' |
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self.__redis.hdel(name, key) |
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def purge(self): |
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allkeys = self.__redis.scan_iter() |
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for key in allkeys: |
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self.delete(key) |
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print("deleted key: {}".format(key)) |
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def close(self): |
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'''close the cache''' |
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self.__redis = None |
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def tryputcache(self, key, value): |
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'''put value in cache key''' |
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if value is None: return |
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try: |
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if self.__redis is not None: |
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self.put(key, value) |
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except redis.exceptions.ConnectionError as ex: |
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self.logexception(ex) |
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def trygetvaluefromcache(self, key): |
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'''get value from cache |
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similar to get but does not raise exception |
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''' |
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try: |
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return self.get(key) |
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except Exception: |
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pass |
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return None |
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class CacheKeys: |
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'''all keys stored in cache''' |
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knownminers = 'knownminers' |
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knownpools = 'knownpools' |
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knownsensors = 'knownsensors' |
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#named pools, a big string. obsolete |
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pools = 'pools' |
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miners = 'miners' |
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camera = 'camera' |
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dfoderick /
fullcycle
