What is the method for storing data in FastAPI's cache?

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FastAPI's built-in cache system uses the CacheControl library to store data in memory. To use it, you can define a cache instance using cachetools library and decorate your function with @cached() decorator from fastapi_cache package.

Here's an example:

from fastapi import FastAPI
from fastapi_cache import caches, close_caches
from fastapi_cache.backends.memory_cache import MemoryCache
from fastapi_cache.decorator import cache

app = FastAPI()

cache_name = "my_cache"
cache_expire_time = 20 * 60  # 20 minutes

cache = MemoryCache(cache_expire_time)
caches.set(cache_name, cache)


@app.get("/my_data/{id}")
@cache(cache_name)
def get_data_from_cache(id: str):
    # your code to fetch data
    data = fetch_data_from_database(id)
    return {"id": id, "data": data}


@app.on_event("shutdown")
def close_all_caches():
    close_caches()

This will cache the response of the get_data_from_cache function for 20 minutes in the specified memory cache instance. When the same request is made again within 20 minutes, the cached response will be returned instead of re-fetching the data from the database.