Can you use the Redix_Pubsub library with Phoenix?

It should be fine if You just add the dependency to the mix file and run mix deps.get.

Then start it like this. You will need to have Redis running.

iex> {:ok, pubsub} = Redix.PubSub.start_link()
{:ok, #PID<0.307.0>}

This is started in the elixir shell. How do we start it in the phoenix app?

I would use

application.ex

Do you mean i should plug the whole code snippet there?

No, just add a line like…

worker(Redix.PubSub, [])

to the children part of the start function.

So I’ve started the redis server and added that worker to the application.ex

What I don’t understand is where my app receives information as the subscriber?

Should I be plugging:

Redix.PubSub.subscribe(pubsub, "my_channel", self())
#=> :ok

# We wait for the subscription confirmation
receive do
   {:redix_pubsub, ^pubsub, :subscribed, %{channel: "my_channel"}} -> :ok
end

Redix.command!(client, ~w(PUBLISH my_channel hello)

receive do
  {:redix_pubsub, ^pubsub, :message, %{channel: "my_channel"} = properties} ->
    properties.payload
end

somewhere?

Your application is just a bunch of processes… Choose a process that cares about the messages sent by Redis and use it to subscribe.

I would not use a receive block. Probably I would use handle_info in a registered GenServer.

Sorry very unfamiliar. I read the documentation and there isn’t a handle_info function either. I shouldn’t be sticking any of this receiver / handle_info code in channels correct?

Let’s take a step back: What are you trying to subscribe to, and what do you want to do when you get a message? What are you trying to accomplish?

All I’m trying to do is get a golang microservice to tell my phoenix app that my data has been processed and saved to the database. So I understand this to be my phoenix app as the subscriber and my golang microservice to be the publisher