[WIP] Feat/watch enhancement

[alwqx]

Hi @Grokzen #201 seems not maintain, I need watch too, so I make this pr based @max8899 code.

[alwqx]

Hi @Grokzen ,I run tests with command pytest --cov rediscluster -k test_pipeline_no_transaction_watch in my local develop environment. But got below error:

________________________________________ TestPipeline.test_pipeline_no_transaction_watch _________________________________________

self = <tests.test_pipeline.TestPipeline object at 0x104947510>, r = StrictRedisCluster<127.0.0.1:7000>

    def test_pipeline_no_transaction_watch(self, r):
        r['a'] = 0

        with r.pipeline(transaction=False) as pipe:
            pipe.watch('a')
            a = pipe.get('a')

>           pipe.multi()

tests/test_pipeline.py:78:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = StrictClusterPipeline, names = ()

    def multi(self, *names):
        """
            """
        if not names:
>           raise RedisClusterException("MULTI command needs at least one name in this pipeline")
E           RedisClusterException: MULTI command needs at least one name in this pipeline

rediscluster/pipeline.py:251: RedisClusterException

It seems the MULTI method not implemented well, can you give some help about multi method. otherwise I can not pass tests.

[Grokzen]

@adolphlwq You have implemented the def multi() function wrong as it should be mirrored the normal redis client like this here def multi(self): https://github.com/andymccurdy/redis-py/blob/master/redis/client.py#L2683

[Grokzen]

@adolphiwq Any update on this MR? No progress for a while not.

[alwqx]

multi method mirrored from redis client is not compatibility for cluster mode.
Also, I find it difficult to implement multi and transaction in redis cluster mode,
Will work on it.