安装Flask-Sockets很容易:
pip install flask-socketio
注意Flask-SocketIO依赖gevent库,目前它仅可以在python2上运行(译者注:python3.6测试也可以)。gevent很快也会对python3支持。
下面是一个Flask-SocketIO在Flask应用上的实现例子:
from flask import Flask, request, jsonify,render_template from flask_socketio import SocketIO, emit app = Flask(__name__) app.config['SECRET_KEY'] = 'secret!' socketio = SocketIO(app) @app.route('/') def index(): return render_template('test.html') #触发事件my event:回复只发送此连接 @socketio.on('my_event', namespace='/chat') def test_message(message): print(message) emit('my_response', {'data': message['data']}) #触发事件my broadcast event::回复所有链接(广播) @socketio.on('my_broadcast event', namespace='/chat') def test_message(message): print(message) emit('my_response', {'data': message['data']}, broadcast=True) ################################################################## #自动连接和自动断开触发 @socketio.on('connect', namespace='/chat') def test_connect(): print("连接到来") emit('my_response', {'data': 'Connected'}) @socketio.on('disconnect', namespace='/chat') def test_disconnect(): print("连接断开") print('Client disconnected') if __name__ == '__main__': socketio.run(app,host='0.0.0.0',port=8200,debug=True)
对应的test.html,注意一个问题:flask是从与启动文件同级的templates查找模板的。
test.html
官方完整示例
#!/usr/bin/env python from threading import Lock from flask import Flask, render_template, session, request, copy_current_request_context from flask_socketio import SocketIO, emit, join_room, leave_room, close_room, rooms, disconnect # Set this variable to "threading", "eventlet" or "gevent" to test the # different async modes, or leave it set to None for the application to choose # the best option based on installed packages. async_mode = None app = Flask(__name__) app.config['SECRET_KEY'] = 'secret!' socketio = SocketIO(app, async_mode=async_mode) thread = None thread_lock = Lock() def background_thread(): """Example of how to send server generated events to clients.""" count = 0 while True: socketio.sleep(100) count += 1 socketio.emit('my_response', {'data': 'Server generated event', 'count': count}, namespace='/test') @app.route('/') def index(): return render_template('test1.html', async_mode=socketio.async_mode) @socketio.on('my_event', namespace='/test') def mtest_message(message): print(message) session['receive_count'] = session.get('receive_count', 0) + 1 # print(message) # print(message['data']) emit('my_response', {'data': message['data'], 'count': session['receive_count']}) @socketio.on('my_broadcast_event', namespace='/test') def mtest_broadcast_message(message): print(message) session['receive_count'] = session.get('receive_count', 0) + 1 emit('my_response', {'data': message['data'], 'count': session['receive_count']}, broadcast=True) @socketio.on('join', namespace='/test') def join(message): print(message) join_room(message['room']) session['receive_count'] = session.get('receive_count', 0) + 1 emit('my_response', {'data': 'In rooms: ' + ', '.join(rooms()), 'count': session['receive_count']}) @socketio.on('leave', namespace='/test') def leave(message): print(message) leave_room(message['room']) session['receive_count'] = session.get('receive_count', 0) + 1 emit('my_response', {'data': 'In rooms: ' + ', '.join(rooms()), 'count': session['receive_count']}) @socketio.on('close_room', namespace='/test') def close(message): session['receive_count'] = session.get('receive_count', 0) + 1 emit('my_response', {'data': 'Room ' + message['room'] + ' is closing.', 'count': session['receive_count']}, room=message['room']) close_room(message['room']) @socketio.on('my_room_event', namespace='/test') def send_room_message(message): session['receive_count'] = session.get('receive_count', 0) + 1 emit('my_response', {'data': message['data'], 'count': session['receive_count']}, room=message['room']) ################################################################## #自动连接和自动断开触发 @socketio.on('connect', namespace='/test') def test_connect(): print("连接到来") emit('my response', {'data': 'Connected'}) @socketio.on('disconnect', namespace='/test') def test_disconnect(): print("连接断开") print('Client disconnected') if __name__ == '__main__': socketio.run(app, debug=True,port= 8200)
test1.html
<!DOCTYPE HTML> <html> <head> <title>Flask-SocketIO Test</title> <script src="/UploadFiles/2021-04-08/jquery.min.js">以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
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