Flask SocketIO - Python

Flask SocketIO is a library that allows for real-time bidirectional communication between the client and server in Flask web applications using the WebSocket protocol. It is an extension of the Flask web framework that adds support for handling real-time web applications.

Features

• Real-time communication between server and client
• Two-way communication using WebSocket protocol
• Multiple channels to handle different types of data
• Support for broadcasting messages to multiple clients
• Support for rooms to group related clients together

Getting Started

To get started with Flask SocketIO, you will need to install it using pip:

pip install flask-socketio

Once installed, you can create a new Flask application and add the SocketIO extension:

from flask import Flask
from flask_socketio import SocketIO

app = Flask(__name__)
sio = SocketIO(app)

You can then use the @socketio.on decorator to define functions that handle incoming events from the client:

@sio.on('connect')
def handle_connect():
    print('Client connected')

And you can use the send method of the SocketIO object to send messages to the client:

@sio.on('message')
def handle_message(data):
    sio.send('Received message: ' + data)

You can also broadcast messages to multiple clients using the emit method:

@sio.on('broadcast')
def handle_broadcast(data):
    sio.emit('message', 'Broadcast message: ' + data, broadcast=True)

And you can group related clients together using rooms:

@sio.on('join')
def handle_join(room):
    sio.join_room(room)

@sio.on('send-to-room')
def handle_send_to_room(data):
    sio.emit('message', 'Room message: ' + data, room=data['room'])

Conclusion

Flask SocketIO is a powerful library for building real-time web applications with Flask. With support for bidirectional communication, multiple channels, broadcasting, and rooms, it provides everything you need to build modern, interactive web applications. Start building your own Flask SocketIO application today!