Fix FeedStream queue processor for unknown messages (orcasound#484)

* Fix queue by skipping unknown SQS messages

* Update setting queue url if not blank, update readme for connecting to heroku

README.md

@@ -153,7 +153,7 @@ The new version (v3) is currently under development, rapidly changing, and has n
 For the moment, this app is running in a Heroku instance with `mix phx.server`. To access the console, run:
 
 ```
-heroku run POOL_SIZE=2 iex -a <app name> -- -S mix
+heroku run FEED_STREAM_QUEUE_URL="" REDIS_URL="" POOL_SIZE=2 iex -a <app name> -- -S mix
 ```
 
 The `POOL_SIZE` config var is necessary due to the current Postgres db having 20 connections. You can read more [about it here](https://hexdocs.pm/phoenix/heroku.html#creating-environment-variables-in-heroku).

server/config/runtime.exs

@@ -51,7 +51,9 @@ if config_env() == :prod do
   host = System.get_env("HOST_URL") || "live.orcasite.com"
   port = String.to_integer(System.get_env("PORT") || "4000")
 
-  config :orcasite, :feed_stream_queue_url, System.get_env("FEED_STREAM_QUEUE_URL")
+  if System.get_env("FEED_STREAM_QUEUE_URL", "") != "" do
+    config :orcasite, :feed_stream_queue_url, System.get_env("FEED_STREAM_QUEUE_URL")
+  end
 
   config :orcasite, OrcasiteWeb.Endpoint,
     url: [host: host, port: 443, scheme: "https"],

server/lib/orcasite/radio/feed_stream_queue.ex

@@ -42,6 +42,9 @@ defmodule Orcasite.Radio.FeedStreamQueue do
               {:ok, %{"Records" => records}} -> records
               _ -> []
             end
+
+          _ ->
+            []
         end
       end)
       |> Enum.flat_map(fn %{"s3" => %{"object" => %{"key" => object_path}}} ->