Python socket.io ack 函数
[英]Python socket.io ack function
问题描述
In JS socket.io, there's the third param in the emit function of client:
在JS socket.io中，客户端的emit函数中有第三个参数：
client.emit("event name",{some:"data"},function myack(value){
})
The myack function is passed to server and called with some returning value: myack函数被传递到服务器并使用一些返回值调用：
//server side:
myack("foobar");
...
However, I don't see this feature in Python socket.io: https://python-socketio.readthedocs.io/en/latest/api.html#asyncserver-class但是，我在 Python socket.io 中没有看到此功能： https ://python-socketio.readthedocs.io/en/latest/api.html#asyncserver-class
Can ack function be passed to Python socket.io server from clientside JS socket.io? ack函数可以从客户端 JS socket.io 传递给 Python socket.io 服务器吗？ Supposed to be using the same application protocol.假设使用相同的应用程序协议。
2 个解决方案
解决方案1
1 已采纳 2020-11-23 07:56:43
Yes you can, have a look at the docs: https://python-socketio.readthedocs.io/en/latest/server.html#event-callbacks是的，你可以，看看文档： https : //python-socketio.readthedocs.io/en/latest/server.html#event-callbacks
From these docs:从这些文档：
When a client sends an event to the server, it can optionally provide a callback function, to be invoked as a way of acknowledgment that the server has processed the event.
@sio.event def my_event(sid, data): # handle the message return "OK", 123Likewise, the server can request a callback function to be invoked after a client has processed an event.
So:所以：
# main.py
import random
from flask import Flask, send_from_directory
from flask_socketio import SocketIO, emit
app = Flask(__name__)
app.config["SECRET_KEY"] = "secret!"
socketio = SocketIO(app)
# Create a route for the index page (http://localhost:5000/)
@app.route("/")
def root():
return send_from_directory(".", "index.html")
# Start listening for connecting clients
@socketio.on("connect")
def handle_connect():
print("Client connected")
# Create a function to act as an ack function
def ack_random_number_received(data):
print("The client received the random number!", data)
# Start listening for "some_event" events
@socketio.on("some_event")
def handle_some_event():
# Create a random number (just for demo purposes)
random_number = random.randint(0, 10)
# Registering a "callback" function here will act as an ack function
emit("random_number_picked", random_number, callback=ack_random_number_received)
# Returning here will send data (a string in this case) to the ack function in JS
return "Ack from Python"
if __name__ == "__main__":
socketio.run(app, debug=True)
<!-- index.html -->
<html>
<head>
<title>My page</title>
</head>
<body>
<p>The random number is: <span id="random-number">...</span></p>
<script src="//cdnjs.cloudflare.com/ajax/libs/socket.io/2.2.0/socket.io.js" integrity="sha256-yr4fRk/GU1ehYJPAs8P4JlTgu0Hdsp4ZKrx8bDEDC3I=" crossorigin="anonymous"></script>
<script type="text/javascript" charset="utf-8">
// Connect to the server
var socket = io();
socket.on('connect', function() {
console.group('Event: connect');
console.log('Emit "some_event"');
socket.emit('some_event', {somedata: 123}, function(ack) {
console.group('Ack function triggered for "some_event"');
console.log('The server acknowledged our event, this is the response:', ack);
console.groupEnd();
});
console.groupEnd();
});
// Listen for events
socket.on('random_number_picked', function(newNumber, callback) {
// Add some logging
console.group('Event: random_number_picked');
console.log('The new random number is', newNumber);
console.log('The ack function is', callback);
// Update a part of the page
document.getElementById("random-number").innerHTML = newNumber;
// Invoke the callback function to send an ack to Python
callback("Ack from JS");
console.groupEnd();
});
</script>
</body>
</html>
解决方案2
0 2020-12-02 09:13:44
Just to simplify the answer by Gijs Wobben:只是为了简化 Gijs Wobben 的回答：
Client side:客户端：
sio.emit("eventname",data,function ackfunc(ackval){
console.log(ackval);
});
Server side:服务器端：
def eventname_func(sid,data):
...
return ackval # This be thrown to ackfunc at client
sio.on("eventname",eventname_func)
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