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POAutomatic redis lookup for python objects
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  1. POAutomatic redis lookup for python objects
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    copied!<p>I'm trying to implement classes for which redis actually holds the attributes, but the user of the class is not aware of this (ie. object persistence across multiple clients). I know there are a few libs that wrap redis for python but none do exactly this in this simple way (but please correct me if I'm wrong on this!)</p> <p>I've successfully implemented automatic redis storage of attributes but I can't seem to get retrieval to work using <code>__getattribute__</code> without infinite recursion blowing it up. I think I am being careful about using <code>object.__getattribute__</code> etc. but obviously I must be missing something:</p> <pre><code>class redisStored(object): global redis # A class method to implement object retrieval from redis # Call &lt;Classname&gt;.load(&lt;id&gt;) to create a new instance which exists in redis @classmethod def load(cls,id): # Create the object obj = cls.__new__(cls) # Set id without calling obj's __setattr__ object.__setattr__(obj,'id',int(id)) # Return the object we created return obj def __str__(self): # Return "&lt;ClassName&gt;:&lt;id&gt;" to differentiate ids in redis # You can use this to say redis.hgetall(g) where g is the instance return "%s:%s" % (self.__class__.__name__, str(object.__getattribute__(self,'id'))) # self.id here ^ would cause infinite recursion # This works fine def __setattr__(self,name,value): redis.hset(self,name,value) return object.__setattr__(self,name,value) # This blows up with infinite recursion, WHY?? def __getattribute__(self,name): _val = redis.hget(self,name) if not _val: return object.__getattribute__(self,name) else: return _val </code></pre> <p>If I trace this it blows up inside <code>_val = redis.hget(self,name)</code> but I can't figure out why. Thanks for any help!</p>
 

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