Start redis if REDIS_URL is defined

Author: royalicing

config/runtime.exs

@@ -70,6 +70,6 @@ if config_env() == :prod do
 end
 
 config :components_guide, :upstash,
-  redis_url: System.fetch_env!("UPSTASH_REDIS_URL"),
+  redis_url: System.get_env("REDIS_URL", ""),
   redis_rest_url: System.fetch_env!("UPSTASH_REDIS_REST_URL"),
   redis_rest_token: System.fetch_env!("UPSTASH_REDIS_REST_TOKEN")

lib/components_guide/application.ex

@@ -9,8 +9,6 @@ defmodule ComponentsGuide.Application do
   def start(_type, _args) do
     upstash_config = Application.fetch_env!(:components_guide, :upstash)
     redis_url_string = Access.fetch!(upstash_config, :redis_url)
-    redis_uri = URI.new!(redis_url_string)
-    IO.inspect(redis_uri)
 
     children = [
       # Start the Telemetry supervisor
@@ -32,11 +30,20 @@ defmodule ComponentsGuide.Application do
         id: :research_spec_cache,
         start: {Cachex, :start_link, [:research_spec_cache, []]}
       },
+      case redis_url_string do
+        "" ->
+          nil
+
+        redis_url_string ->
+          {Redix, {redis_url_string, [name: :upstash_redix]}}
+      end,
+      nil
       # {Redix, {Access.fetch!(upstash_config, :redis_url), [name: :upstash_redix]}}
-      # {Redix, {redis_url_string, [name: :upstash_redix]}}
       # ComponentsGuide.Worker
     ]
 
+    children = children |> Enum.reject(&is_nil/1)
+
     # See https://hexdocs.pm/elixir/Supervisor.html
     # for other strategies and supported options
     opts = [strategy: :one_for_one, name: ComponentsGuide.Supervisor]