Created
October 28, 2011 19:35
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graph-like structure in redis
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class Isred(Redis): | |
def node(self, serial = None): | |
return Node(self, serial) | |
class Node(dict): | |
def __init__(self, r, serial = None): | |
self.redis = r | |
self.serial = str(serial) if serial else r.incr('serial') | |
def __getitem__(self, key): | |
return self.redis.hget('attr-%s' % key, self.serial) | |
def __setitem__(self, key, value): | |
return self.redis.hset('attr-%s' % key, self.serial, value) | |
def delete(self): | |
raise Exception('you should extend the base class' | |
' to determine what attributes is to be deleted') | |
def link(self, target, self_type = '', target_type = ''): | |
self._link(self, self_type, target) | |
self._link(target, target_type, self) | |
def _link(self, node, link_type, target): | |
links_key = ('link-%s' % link_type) if link_type else 'link' | |
links = self.redis.hget(links_key, node.serial) | |
if links: | |
links = set(links.split()) | |
links.add(str(target.serial)) | |
else: | |
links = set([str(target.serial)]) | |
self.redis.hset(links_key, node.serial, ' '.join(links)) | |
def get_links(self, link_type = ''): | |
links_key = ('link-%s' % link_type) if link_type else 'link' | |
links = self.redis.hget(links_key, self.serial) | |
return links.split() if links else [] | |
def is_link_to(self, target, link_type = ''): | |
return target.serial in self.get_links(link_type) | |
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