How Pinterest Generate Global Uuid?

gistfile1.txt

class PinId(object):
    SHARD_LEN = 46
    OBJECT_LEN = 10
    
    @classmethod
    def uuid(clz, shard_id, object_type, local_id):
        sid = shard_id << clz.SHARD_LEN | object_type << clz.OBJECT_LEN | local_id
        return sid
    
    @classmethod
    def parse(clz, vuuid):
        shard_id = vuuid >> clz.SHARD_LEN
        temp = vuuid - (shard_id << clz.SHARD_LEN)
        object_type = temp >> clz.OBJECT_LEN
        local_id = temp - (object_type << clz.OBJECT_LEN)
        return (shard_id, object_type, local_id)


if __name__ == '__main__':
    ss = PinId.uuid(123,200,45)
    print ss
    print PinId.parse(ss)