Flask-Limiter provides rate limiting features to flask applications.
It allows configuring various backends to persist the rate limits, which is provided by the limits library.
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Quickstart
Add the rate limiter to your flask app.
from flask import Flask
from flask_limiter import Limiter
from flask_limiter.util import get_remote_address
app = Flask(__name__)
limiter = Limiter(
app,
key_func=get_remote_address,
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",
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'
app.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.
$ 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
PONGFor more details read the docs
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