SSE based Pub/Sub Broker

Question

I would like to have an Http based pub/sub server that messages are published to channels with HTTP POST requests, and subscribed through EventSource (SSE). Besides that, I would like to add wildcard subscription capability (check here to know more about it: https://www.hivemq.com/blog/mqtt-essentials-part-5-mqtt-topics-best-practices) similar to MQTT for the SSE broker.

Do you have any suggestions? Is there something similar out there?

Answer 1

The closest pub/sub using SSE is https://nchan.io/ . Could not be as complete as MQTT but supports not just SSE, also POST/GET, Websockets and even long pooling.

Doesn't seems that wildcard are implemented, but at least you can define several url/query string mappings for a channel:

location ~ /sub/(\w+)$ {
   #channel id is the word after /sub/
   # GET /sub/foobar_baz will have the channel id set to 'foobar_baz'
   # I hope you know your regular expressions...
   nchan_subscriber;
   nchan_channel_id $1; #first capture of the location match
}