Cache with Django

Redis

Student @ FMI ~ 4 years

Some questions:

What am I caching...

Where to store my cache?

Cache invalidation?

Hmm, what about race conditions?

CACHE

Template part

{% load cache %}
{% cache 500 sidebar request.user.username %}
    .. sidebar for logged in user ..
{% endcache %}

A string

>>> cache.set('my_key', 'hello, world!', 30)
>>> cache.get('my_key')

Query result

>>> cache.set('all_users', User.objects.all(), 30)
>>> cache.get('all')
Out[1]: <QuerySet [<User: >]>

A page

@cache_page(60 * 15)
def my_view(request):
    pass

Where to store it ?

Django's own memory

cache server

DB

FAST

SLOW

Unstable

Stable

Where to store it ?

IN DJANGO

IN

FILESYSTEM

HOW IT WORKS ?

- Purge

- TTL :/

- Refresh

- Ban

Cache invalidation strategies

Race conditions

After two hours of debugging

Why this is good/bad ?

Why this is good/bad ?

Sample json response:

   {
        "id": 1,
        "email": "ivodonchev267@gmail.com",
        "password": hack-me-pass,
        "last_login": "2017-02-04T20:55:08.914461+00:00",
        "profile": {
            "id": 1,
            "full_name": "Ivaylo Donchev,
            "age": 22
         },
  },

Caching string vs caching data structures