First working iteration of shortnr api

lib/url/repo/dets.ex

@@ -0,0 +1,20 @@
+defmodule Shortnr.URL.Repo.DETS do
+  @behaviour Shortnr.URL.Repo
+
+  @impl true
+  def get(key) do
+    {:ok, :dets.lookup(:urls, key) |> List.first() |> elem(1)}
+  end
+
+  @impl true
+  def put(url) do
+    :ok = :dets.insert(:urls, {url.id, url})
+    :ok
+  end
+
+  @impl true
+  def list() do
+    resp = :dets.select(:urls, [{:"$1", [], [:"$1"]}])
+    {:ok, resp |> Enum.map(&elem(&1, 1))}
+  end
+end

lib/url/repo/repo.ex

@@ -0,0 +1,8 @@
+defmodule Shortnr.URL.Repo do
+  alias Shortnr.URL
+  alias Shortnr.Transport
+
+  @callback put(URL.t()) :: :ok | Transport.error()
+  @callback get(String.t()) :: {:ok, URL.t()} | Transport.error()
+  @callback list() :: {:ok, list(URL.t())} | Transport.error()
+end