Hi Andrew,
Many thanks for your input - that does indeed help.
What was really confusing me was what arguments I actually needed to supply
to the JsonWebsocketConsumer.group_send() function.
Not fully understanding classmethods, I was trying to pass the cls argument
as well.
I understand what the group_name and payload arguments do - but what s the
stream argument doing?
Dan
On Tuesday, 4 April 2017 13:57:07 UTC+1, Andrew Godwin wrote:
>
> Hi Dan,
>
> An initial glance shows that you might be passing the arguments wrong to
> Multiplexer.group_send(group_name, stream, payload) - I'm not sure why you
> are using multiplexer.__class__.__name__ as the group name, but the group
> name you configured in connection_groups is updatedb_results, and the
> stream you're listening to in the JS client is also updatedb_results, so
> you should set both of these to that value.
>
> Andrew
>
> On Tue, Apr 4, 2017 at 9:55 AM, Dan Alderman <daniel.thom...@gmail.com
> <javascript:>> wrote:
>
>> Hi guys,
>>
>> Been trying to get my head around this for ages now but still no luck,
>> hopefully someone can point me in the right direction.
>>
>> I'm trying to set up a Demultiplexer with a JsonWebsocketConsumer that
>> sends to a group. (There is only one stream in the Demultiplexer at the
>> moment, but I intend to add more).
>>
>> The prints in each of the functions work when I interact with my app in
>> the web browser, but I'm having trouble getting a response in the
>> browser via websockets.
>>
>> If I user multiplexer.send() then it works, but it only goes to a single
>> connection (as you'd expect).
>>
>> consumers.py
>>
>> from channels.generic.websockets import JsonWebsocketConsumer,
>> WebsocketDemultiplexer
>>
>> class DatabaseUpdateConsumer(JsonWebsocketConsumer):
>> strict_ordering = True
>>
>> def connection_groups(self, **kwargs):
>> return ["updatedb_results"]
>>
>> def connect(self, message, multiplexer, **kwargs):
>> print "Connected!"
>> multiplexer.group_send(multiplexer.__class__.__name__,
>> self.connection_groups(), {'text': "Connected!"})
>>
>> def disconnect(self, message, multiplexer, **kwargs):
>> print("Stream %s is closed" % multiplexer.stream)
>>
>> def receive(self, content, multiplexer, **kwargs):
>> print "Message received by server!"
>> multiplexer.group_send(multiplexer.__class__.__name__,
>> self.connection_groups(), {'text': "Message received by server!"})
>>
>> class Demultiplexer(WebsocketDemultiplexer):
>>
>> consumers = {
>> "updatedb_results": DatabaseUpdateConsumer,
>> }
>>
>> index.html
>>
>> {% extends "base.html" %}
>>
>> {% block title %}Test Dashboard{% endblock %}
>>
>> {% block content %}
>> <div id="currentCount">{{ job_detail|length }}</div>
>> <br>
>> {% for line in job_detail %}
>> <div id="{{ line.id }}">{{ line.job_number }}</div>
>> {% endfor %}
>> {% endblock %}
>>
>> {% block javascript %}
>> <script>
>> const webSocketBridge = new channels.WebSocketBridge();
>> webSocketBridge.connect("ws:/development01:8000/ws/");
>> webSocketBridge.listen();
>> webSocketBridge.demultiplex('updatedb_results', function(data, stream) {
>> console.log(data);
>> });
>> </script>
>> {% endblock %}
>>
>> routing.py
>>
>> from channels import route_class
>> from dashboard.consumers import Demultiplexer
>>
>> channel_routing = [
>> route_class(Demultiplexer, path="^/ws/"),
>> ]
>>
>> Can anyone tell me where I'm going wrong?
>>
>> Thanks,
>>
>> Dan
>>
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