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)
self.ring.sadd(reverse_key, from_user) = reverse
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)
下面是一种重写的方式： 从环中删除指定用户，操作后的环称为“reverse”，并返回删除的用户。 ```python removed_user = self.ring.srem(reverse_key, from_user) reverse = self.ring # 将删除操作后的环赋值给 reverse ```
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)
self.ring.sadd(reverse_key, from_user) = reverse
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)
下面是一种重写的方式： 从环中删除指定用户，操作后的环称为“reverse”，并返回删除的用户。 ```python removed_user = self.ring.srem(reverse_key, from_user) reverse = self.ring # 将删除操作后的环赋值给 reverse ```
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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