server - update view count on threads

lib/myapp/view_counter.ex

@@ -0,0 +1,20 @@
+defmodule MyApp.ViewCounter do
+  alias MyApp.Data
+
+  # cache end points for 5 minutes based on the browser fingerprint
+
+  @spec thread_view_count(String.t, integer) :: {:error, String.t} | {any, boolean}
+  def thread_view_count(fingerprint, thread_id) do
+
+    key = "#{fingerprint}:#{thread_id}"
+
+    case Cachex.get(:myapp, key) do
+      {:ok, _} -> {:error, "Already viewed."}
+      {:missing, _} ->
+        {1, nil} = Data.Thread.update_view_count(thread_id)
+        Cachex.set(:myapp, key, true, ttl: :timer.minutes(5))
+    end
+
+  end
+
+end