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I've been thinking lately about how perfect Redis would be for storing a

simple social graph. I posited that it would be relatively few lines of code,

and that it'd be clean code too. So here it is: a basic social graph built on Redis.

"""

class FriendGraph(object):

def __init__(self, ring):

self.ring = ring

# These keys are intentionally short, so as to save on memory in redis

self.FOLLOWS_KEY = 'F'

self.FOLLOWERS_KEY = 'f'

self.BLOCKS_KEY = 'B'

self.BLOCKED_KEY = 'b'

def follow(self, from_user, to_user):

forward_key = '%s:%s' % (self.FOLLOWS_KEY, from_user)

forward = self.ring.sadd(forward_key, to_user)

reverse_key = '%s:%s' % (self.FOLLOWERS_KEY, to_user)

reverse = self.ring.sadd(reverse_key, from_user)

return forward and reverse

怎样用Redis存储好友关系-python版

def unfollow(self, from_user, to_user):

forward_key = '%s:%s' % (self.FOLLOWS_KEY, from_user)

forward = self.ring.srem(forward_key, to_user)

reverse_key = '%s:%s' % (self.FOLLOWERS_KEY, to_user)

reverse = self.ring.srem(reverse_key, from_user)

return forward and reverse

def block(self, from_user, to_user):

forward_key = '%s:%s' % (self.BLOCKS_KEY, from_user)

forward = self.ring.sadd(forward_key, to_user)

reverse_key = '%s:%s' % (self.BLOCKED_KEY, to_user)

reverse = self.ring.sadd(reverse_key, from_user)

return forward and reverse

def unblock(self, from_user, to_user):

forward_key = '%s:%s' % (self.BLOCKS_KEY, from_user)

forward = self.ring.srem(forward_key, to_user)

reverse_key = '%s:%s' % (self.BLOCKED_KEY, to_user)

reverse = self.ring.srem(reverse_key, from_user)

return forward and reverse

def get_follows(self, user):

follows = self.ring.smembers('%s:%s' % (self.FOLLOWS_KEY, user))

blocked = self.ring.smembers('%s:%s' % (self.BLOCKED_KEY, user))

return list(follows.difference(blocked))

def get_followers(self, user):

followers = self.ring.smembers('%s:%s' % (self.FOLLOWERS_KEY, user))

blocks = self.ring.smembers('%s:%s' % (self.BLOCKS_KEY, user))

return list(followers.difference(blocks))

def get_blocks(self, user):

return list(self.ring.smembers('%s:%s' % (self.BLOCKS_KEY, user)))

def get_blocked(self, user):

return list(self.ring.smembers('%s:%s' % (self.BLOCKED_KEY, user)))

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