Send notifications with Rabbitmq - django

Question

I'm using django, django rest framework and Rabbitmq,What I want is using Rabbitmq to send notifications to client after user create a comment(like long polling).
I follow the RabbitMQ Tutorials here.
Here is my view.py to create comments:
class CommentList(generics.ListCreateAPIView):
permission_classes = (permissions.IsAuthenticatedOrReadOnly,)
queryset = Comment.objects.all()
serializer_class = CommentSerializer
def perform_create(self, serializer):
serializer.save(user=self.request.user)
def create(self, request, *args, **kwargs):
#use pika and rabbitmq to notifity user
connection = pika.BlockingConnection(pika.ConnectionParameters(
host='localhost'))
channel = connection.channel()
channel.queue_declare(queue='task_queue', durable=True)
message = 'Hello, world'
channel.basic_publish(exchange='',
routing_key='task_queue',
body=message,
properties=pika.BasicProperties(
delivery_mode = 2, # make message persistent
))
connection.close()
return super().create(request, args, kwargs)
I create a queue call "task_queue", and sent message "Hello, world" every time I create I comment.
Here is my view.py to receive message:
def get_notifications(request):
connection = pika.BlockingConnection(pika.ConnectionParameters(
host='localhost'))
channel = connection.channel()
channel.queue_declare(queue='task_queue', durable=True)
def callback(ch, method, properties, body):
return HttpResponse("ok")
ch.basic_ack(delivery_tag = method.delivery_tag)
#channel.basic_qos(prefetch_count=1)
channel.basic_consume(callback,
queue='task_queue')
channel.start_consuming()
In client side, I use a jquery ajax function to request data:
function poll() {
var poll_interval=0;
$.ajax({
url: "/sub", //sub calls get_notifications()
type: 'GET',
dataType: 'json',
success: function(data) {
append_circle();
poll_interval=0;
},
error: function () {
poll_interval=1000;
},
complete: function () {
setTimeout(poll, poll_interval);
},
});
}
I can send the message after I create the comment, but my client side doesn't receive any data, in my chrome console, I find this:
sub/ (pending) xhr
What should I do?

Answer 1

For this type of application, websockets are the better option. I suggest you to use websockets instead of long polling. Because long polling is resource hungry process. To use websockets, you can use channels