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#!/usr/bin/env python

import redis
from ncelery import conf

class RedisClient(redis.StrictRedis):

    """
    Singleton pattern
    http://stackoverflow.com/questions/42558/python-and-the-singleton-pattern
    """

    _instance = {}

    def __init__(self, server):
        redis.StrictRedis.__init__(self, **server)

    def __new__(cls, *args):
        if str(args) not in cls._instance:
            cls._instance[str(args)] = super(RedisClient, cls).__new__(cls)
        return cls._instance[str(args)]

rc = RedisClient(conf.REDIS_CACHE)


class RedisQueue(object):

    """
    Args:
        serializer:
            the class or module to serialize msgs with, must have
            methods or functions named ``dumps`` and ``loads``
            such as `pickle` and json are good idea
    """

    def __init__(self, name, serializer=None, llen=None):
        self.name = name
        self.serializer = serializer
        self.llen = llen

    def __len__(self):
        return rc.llen(self.name)

    def __iter__(self):
        for i in rc.lrange(self.name, 0, -1):
            yield i

    def __repr__(self):
        return 'redis.queue: <%s>' % self.name

    def getlist(self, start=None, end=None):
        msg_list = []
        try:
            start = start if start is not None else 0
            end = end if end is not None else self.__len__()
            _list = rc.lrange(self.name, start, end)
            if self.serializer is not None:
                for msg in _list:
                    msg_list.append(self.serializer.loads(msg))
            else:
                msg_list.extend(_list)
        except:
            pass
        return msg_list

    def put(self, msgs):
        if self.serializer is not None:
            msgs = self.serializer.dumps(msgs)
            
        if self.llen is not None:
            list_len = self.__len__()
            if list_len >= self.llen:
                pop_len = list_len - self.llen + 1
                for i in range(pop_len):
                    rc.lpop(self.name)
        msg = rc.rpush(self.name, msgs)

        return msg

    def pop(self, block=False, timeout=0):
        if block:
            msg = rc.blpop(self.name, timeout)
            if msg is not None:
                msg = msg[1]
        else:
            msg = rc.lpop(self.name)
        if self.serializer is not None and msg is not None:
            return self.serializer.loads(msg)
        return msg

    def consume(self, block=True, timeout=0):
        while 1:
            try:
                msg = self.pop(block, timeout)
                yield msg
            except KeyboardInterrupt:
                return

    def clear(self):
        if rc.exists(self.name):
            rc.delete(self.name)


class RedisString(object):

    """
    Args:
        serializer:
            the class or module to serialize msgs with, must have
            methods or functions named ``dumps`` and ``loads``
            such as `pickle` and json are good idea
    """

    def __init__(self, serializer=None):
        self.serializer = serializer

    def __repr__(self):
        return 'redis.string'

    def set(self, name, msgs, timeout=None):
        if self.serializer is not None:
            msgs = self.serializer.dumps(msgs)
        rc.set(name, msgs)
        if timeout is not None:
            rc.expire(name, int(timeout))

    def add(self, name, msgs, timeout=None):
        if rc.exists(name):
            return False

        else:
            self.set(name, msgs, timeout)
            return True

    def get(self, name, block=True):
        msg = rc.get(name)
        try:
            if msg is not None and self.serializer is not None:
                return self.serializer.loads(msg)
        except:
            pass
        return msg

    def keys(self, pattern='*'):
        return rc.keys(pattern)

    def isexist(self, name):
        if rc.exists(name):
            return True
        else:
            return False

    def delete(self, name):
        if rc.exists(name):
            rc.delete(name)


class RedisSet(object):
    """
    Args:
        serializer:
            the class or module to serialize msgs with, must have
            methods or functions named ``dumps`` and ``loads``
            such as `pickle` and json are good idea
    """

    def __init__(self, name, serializer=None):
        self.name = name
        self.serializer = serializer

    def __len__(self):
        return rc.scard(self.name)

    def __iter__(self):
        for i in rc.smembers(self.name):
            yield i

    def __repr__(self):
        return 'redis.set:<%s>' % self.name

    def isexist(self, msg):
        if self.serializer is not None:
            msg = self.serializer.dumps(msg)
        if rc.sismember(self.name, msg):
            return True
        else:
            return False

    def add(self, msg):
        if self.serializer is not None:
            msg = self.serializer.dumps(msg)
        flag = rc.sadd(self.name, msg)
        if flag:
            return True
        else:
            return False

    def rem(self, msg):
        if self.serializer is not None:
            msg = self.serializer.dumps(msg)
        flag = rc.srem(self.name, msg)
        if flag:
            return True
        else:
            return False

    def getlist(self):
        msg_list = list()
        _msg_set = rc.smembers(self.name)
        if self.serializer is not None:
            for msg in _msg_set:
                msg_list.append(self.serializer.loads(msg))
        else:
            msg_list.extend(list(_msg_set))
        return msg_list


if __name__ == '__main__':
    rq = RedisQueue('client:log')
    for m in rq.consume():
        print len(m), type(m)