Redison - extension for redis to get/set json objects

redison.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Redison - an extension for redis to get/set json objects
# https://gist.github.com/ranaroussi/90268aca3bf438d1aabfdb918288c6a9/edit
#
# Copyright 2020 Ran Aroussi
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

import redis
import json
from datetime import datetime, date
from decimal import Decimal


def _json_formatter(obj):
    if isinstance(obj, datetime) or isinstance(obj, date):
        return obj.isoformat()
    elif isinstance(obj, Decimal) or isinstance(obj, float):
        return str(obj)
    else:
        return None

json_formatter = lambda obj: _json_formatter(obj)


class Redison(redis.Redis):
    """
    Usage:
    cache = redison.Redison.from_url(REDIS_CONN_STR, decode_responses=True)
    
    # Set a key
    # cache.set_json("key", myjson[, **kwargs])
    myjson = {"foo": "bar"}
    cache.set_json("key", myjson, ex=86400)  # 24hrs expiry
    
    # Get a key:
    myjson = cache.get_json("key")
    print(">>", myjson.get("foo"))
    """
    def get_json(self, key):
        data = self.get(key)
        if not data:
            return {}
        return json.loads(data)

    def set_json(self, key, data, **kwargs):
        out = json.dumps(
            data, default=json_formatter)
        self.set(key, out, **kwargs)
        return out