<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def hstrlen(self, name, key):
 """ Return the number of bytes stored in the value of ``key`` within hash ``name`` """

        with self.pipe as pipe:
            return pipe.hstrlen(self.redis_key(name), key)