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Flask-SSE

Server-Sent Events for Flask

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Flask SSE |build-status| |coverage-status| |docs|

A Flask extension for HTML5 server-sent events support, powered by Redis.

Example of sending events:

.. code-block:: python

from flask import Flask
from flask_sse import sse

app = Flask(__name__)
app.config["REDIS_URL"] = "redis://localhost"
app.register_blueprint(sse, url_prefix='/stream')

@app.route('/send')
def send_message():
    sse.publish({"message": "Hello!"}, type='greeting')
    return "Message sent!"

To receive events on a webpage, use Javascript to connect to the event stream, like this:

.. code-block:: javascript

var source = new EventSource("{{ url_for('sse.stream') }}");
source.addEventListener('greeting', function(event) {
    var data = JSON.parse(event.data);
    // do what you want with this data
}, false);

The full documentation for this project is hosted on ReadTheDocs. <http://flask-sse.readthedocs.org/>_

.. _server-sent events: https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events .. _Redis: http://www.redis.io/

.. |build-status| image:: https://github.com/singingwolfboy/flask-sse/workflows/Test/badge.svg :target: https://github.com/singingwolfboy/flask-sse/actions?query=workflow%3ATest :alt: Build status .. |coverage-status| image:: http://codecov.io/github/singingwolfboy/flask-sse/coverage.svg?branch=master :target: http://codecov.io/github/singingwolfboy/flask-sse?branch=master :alt: Test coverage .. |docs| image:: https://readthedocs.org/projects/flask-sse/badge/?version=latest&style=flat :target: http://flask-sse.readthedocs.org/ :alt: Documentation

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