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*************
Flask-Limiter
*************
|docs| |ci| |codecov| |pypi| |license|
**Flask-Limiter** adds rate limiting to `Flask <https://flask.palletsprojects.com>`_ applications.
You can configure rate limits at different levels such as:
- Application wide global limits per user
- Default limits per route
- By `Blueprints <https://flask-limiter.readthedocs.io/en/latest/recipes.html#rate-limiting-all-routes-in-a-blueprint>`_
- By `Class-based views <https://flask-limiter.readthedocs.io/en/latest/recipes.html#using-flask-pluggable-views>`_
- By `individual routes <https://flask-limiter.readthedocs.io/en/latest/index.html#decorators-to-declare-rate-limits>`_
**Flask-Limiter** can be `configured <https://flask-limiter.readthedocs.io/en/latest/configuration.html>`_ to fit your application in many ways, including:
- Persistance to various commonly used `storage backends <https://flask-limiter.readthedocs.io/en/latest/#configuring-a-storage-backend>`_
(such as Redis, Memcached, MongoDB & Etcd)
via `limits <https://limits.readthedocs.io/en/stable/storage.html>`__
- Any rate limiting strategy supported by `limits <https://limits.readthedocs.io/en/stable/strategies.html>`__
Follow the quickstart below to get started or `read the documentation <http://flask-limiter.readthedocs.org/en/latest>`_ for more details.
Quickstart
===========
Install
-------
.. code-block:: bash
pip install Flask-Limiter
Add the rate limiter to your flask app
---------------------------------------
.. code-block:: python
# app.py
from flask import Flask
from flask_limiter import Limiter
from flask_limiter.util import get_remote_address
app = Flask(__name__)
limiter = Limiter(
get_remote_address,
app=app,
default_limits=["2 per minute", "1 per second"],
storage_uri="memory://",
# Redis
# storage_uri="redis://localhost:6379",
# Redis cluster
# storage_uri="redis+cluster://localhost:7000,localhost:7001,localhost:70002",
# Memcached
# storage_uri="memcached://localhost:11211",
# Memcached Cluster
# storage_uri="memcached://localhost:11211,localhost:11212,localhost:11213",
# MongoDB
# storage_uri="mongodb://localhost:27017",
# Etcd
# storage_uri="etcd://localhost:2379",
strategy="fixed-window", # or "moving-window"
)
@app.route("/slow")
@limiter.limit("1 per day")
def slow():
return "24"
@app.route("/fast")
def fast():
return "42"
@app.route("/ping")
@limiter.exempt
def ping():
return 'PONG'
Inspect the limits using the command line interface
---------------------------------------------------
.. code-block:: bash
$ FLASK_APP=app:app flask limiter limits
app
├── fast: /fast
│ ├── 2 per 1 minute
│ └── 1 per 1 second
├── ping: /ping
│ └── Exempt
└── slow: /slow
└── 1 per 1 day
Run the app
-----------
.. code-block:: bash
$ FLASK_APP=app:app flask run
Test it out
-----------
The ``fast`` endpoint respects the default rate limit while the
``slow`` endpoint uses the decorated one. ``ping`` has no rate limit associated
with it.
.. code-block:: bash
$ curl localhost:5000/fast
42
$ curl localhost:5000/fast
42
$ curl localhost:5000/fast
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>429 Too Many Requests</title>
<h1>Too Many Requests</h1>
<p>2 per 1 minute</p>
$ curl localhost:5000/slow
24
$ curl localhost:5000/slow
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<title>429 Too Many Requests</title>
<h1>Too Many Requests</h1>
<p>1 per 1 day</p>
$ curl localhost:5000/ping
PONG
$ curl localhost:5000/ping
PONG
$ curl localhost:5000/ping
PONG
$ curl localhost:5000/ping
PONG
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