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POHow to push notification from server (django) to client (socketio)?
 

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  1. POHow to push notification from server (django) to client (socketio)?
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    <p>I want to emit message from server to client. I have look at this but cannot use because I cannot create a namespace instance. <a href="https://stackoverflow.com/questions/15535673/how-to-emit-socketio-event-on-the-serverside">How to emit SocketIO event on the serverside</a></p> <p>My use case is: I have a database of price of product. A lot of users are currently surf my website. Some of them is viewing product X. On the server side, the admin can edit the price of the product. If he edit the price of X, all the client must see the notification that X price change (e.x: a simple js alert).</p> <p>My client javascript now:</p> <pre><code>var socket = io.connect('/product'); #notify server that this client is viewing product X socket.emit("join", current_product.id); #upon receive msg from server socket.on('notification', function (data) { alert("Price change"); }); </code></pre> <p>My server code (socket.py):</p> <pre><code>@namespace('/products') class ProductsNamespace(BaseNamespace, ProductSubscriberMixin): def initialize(self, *args, **kwargs): _connections[id(self)] = self super(ProductsNamespace, self).initialize(*args, **kwargs) def disconnect(self, *args, **kwargs): del _connections[id(self)] super(ProductsNamespace, self).disconnect(*args, **kwargs) def on_join(self, *args): print "joining" def emit_to_subscribers(self): pass </code></pre> <p>I use the runserver_socketio.py as in this <a href="https://github.com/calvinchengx/learnsocketio" rel="nofollow noreferrer">link</a>. (Thanks to Calvin Cheng for this excellent up-to-date example.)</p> <p>I don't know how to call the emit_to_subscribers. Since I have no instance of namespace. As I read from this <a href="https://gevent-socketio.readthedocs.org/en/latest/namespace.html#module-socketio.namespace" rel="nofollow noreferrer">doc</a> , </p> <blockquote> <p>Namespaces are created only when some packets arrive that ask for the namespace. </p> </blockquote> <p>But how can I send the packet to that namespace from the code? IF I can only create the instance when a client emit message to server, when no one is surfing the site, right after finish editing the price, the system will fail.</p> <p>I am really confused about the namespace and its instance. If you have any clearer docs, please help me.</p> <p>Thanks a lot!</p>
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      1. POHow to push notification from server (django) to client (socketio)?
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    1. COI have got a dirty workaround for this. Still use the _connections dictionary to keep track of the current connection. Then use _connections.items()[0][1].emit_to_subscribers().
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      1. POHow to push notification from server (django) to client (socketio)?
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