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

lib/url/url.ex

@@ -0,0 +1,46 @@
+defmodule Shortnr.URL do
+  alias Shortnr.Transport
+  alias Shortnr.URL
+
+  defstruct id:
+              for(
+                _ <- 0..7,
+                into: "",
+                do:
+                  Enum.random(
+                    String.codepoints(
+                      "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXWYZ0123456789"
+                    )
+                  )
+              ),
+            created_at: DateTime.utc_now(),
+            updated_at: DateTime.utc_now(),
+            url: %URI{}
+
+  @type t :: %__MODULE__{id: String.t(), url: URI.t()}
+
+  @spec create(String.t(), module()) :: {:ok, String.t()} | Transport.error()
+  def create(url, repo) do
+    url_struct = %URL{url: URI.parse(url)}
+    :ok = repo.put(url_struct)
+    {:ok, url_struct.id}
+  end
+
+  @spec get(String.t(), module()) :: {:ok, URL.t()} | Transport.error()
+  def get(key, repo) do
+    {:ok, _} = repo.get(key)
+  end
+
+  @spec list(module()) :: {:ok, list(URL.t())} | Transport.error()
+  def list(repo) do
+    {:ok, _} = repo.list
+  end
+
+  defimpl String.Chars do
+    alias Shortnr.URL
+    @spec to_string(URL.t()) :: String.t()
+    def to_string(url) do
+      "id=#{url.id} created=#{url.created_at} updated=#{url.updated_at} url=#{url.url}"
+    end
+  end
+end