"""
Example of caching using aiocache package. To run it you will need a Redis
instance running in localhost:6379. You can also try with SimpleMemoryCache.

Running this example you will see that the first call lasts 3 seconds and
the rest are instant because the value is retrieved from the Redis.

If you want more info about the package check
https://github.com/argaen/aiocache
"""

import logging
import asyncio
import aiocache

from sanic import Sanic
from sanic.response import json
from aiocache import cached
from aiocache.serializers import JsonSerializer

app = Sanic(__name__)
log = logging.getLogger(__name__)


@app.listener('before_server_start')
def init_cache(sanic, loop):
    aiocache.settings.set_defaults(
        class_="aiocache.RedisCache",
        # class_="aiocache.SimpleMemoryCache",
        loop=loop
    )


@cached(key="my_custom_key", serializer=JsonSerializer())
async def expensive_call():
    log.info("Expensive has been called")
    await asyncio.sleep(3)
    return {"test": True}


@app.route("/")
async def test(request):
    log.info("Received GET /")
    return json(await expensive_call())


app.run(host="0.0.0.0", port=8000)