odoo redis ormcache

odoo版本:12.0
实现将odoo的数据缓存到redis 中, 在搭建odoo 集群中会用到

## RedisLRU.py
__all__ = ['RedisLRU']

import types
import pickle


def to_str(obj):
    if (isinstance(obj, tuple) or isinstance(obj, list) or isinstance(
            obj, frozenset) or isinstance(obj, set) or
            isinstance(obj, enumerate)):
        return '[' + ",".join(to_str(i) for i in obj) + ']'
    elif isinstance(obj, dict):
        return '{' + ",".join(to_str(kv) for kv in obj.items()) + '}'
    else:
        return str(obj)


class RedisLRU(object):

    def __init__(self, redis, namespace, expire):
        self.redis = redis
        self.namespace = namespace
        self.namespace_generation = 0
        self.expire = expire or 604800  # default 7 days in second
        version = self.redis.execute_command(
            "eval ", "return redis.call('get'," "'" + self.namespace +
                     "_generation')", 0)
        if not version:
            self.redis.execute_command(
                "eval ", "return redis.call("
                         "'incr','" + self.namespace + "_generation')", 0)

    def __contains__(self, obj):
        key = to_str(obj)
        return self.redis.execute_command(
            "eval ", "return redis.call('exists','" + self.namespace +
                     "_'..redis.call('get','"
                     "" + self.namespace + "_generation')..'" + key + "')", 0)

    def __getitem__(self, obj):
        key = to_str(obj)
        try:
            res = self.redis.execute_command(
                "eval ", "return redis.call('get','" + self.namespace +
                         "_'..redis.call('get','" + self.namespace +
                         "_generation')..'" + key + "')", 0)
            if res:
                return pickle.loads(res)
        except Exception as e:
            raise TypeError(e)
        raise KeyError("None")

    def __setitem__(self, obj, val):
        if isinstance(val, types.FunctionType):
            self.__delitem__(obj)
            return
        key = to_str(obj)
        jsonval = pickle.dumps(val)
        self.redis.execute_command(
            "eval ",
            "return redis.call('setex','" + self.namespace
            + "_'..redis.call('get','" + self.namespace + "_generation')..'"
            + key + "'," + str(self.expire) + ",KEYS[1])", 1, jsonval)

    def __delitem__(self, obj):
        key = to_str(obj)
        self.redis.execute_command(
            "eval ", "return redis.call('del','" + self.namespace +
                     "_'..redis.call('get','" + self.namespace +
                     "_generation')..'" + key + "')", 0)

    def get(self, obj):
        return self.__getitem__(obj)

    def set(self, obj, val=None):
        self.__setitem__(obj, val)

    def pop(self, obj):
        res = self.__getitem__(obj)
        self.__delitem__(obj)
        return res

    def clear(self):
        self.redis.execute_command(
            "eval ", "return redis.call('incr','" + self.namespace +
                     "_generation')", 0)

## 修改registry.py

@lazy_property
def cache(self):
    """ A cache for model methods. """
    # this lazy_property is automatically reset by lazy_property.reset_all()

    r = redis.StrictRedis.from_url(odoo.tools.config['ormcache_redis_url'])
    return RedisLRU(
        r, self.db_name, odoo.tools.config.get('ormcache_redis_expire'))
    # return LRU(8192)

## odoo.conf
ormcache_redis_url=redis://@<redis_host>
ormcache_redis_expire=<expiry_of_cache_in_seconds>

https://write.agrevolution.in/odoo-cache-to-redis-v11-e06f628b8de8
odoo10 集群:
https://github.com/liuqwert/Odoo-Cluster