get started on route for creating links, dividing steps into components

lib/entendu/application.ex

@@ -6,7 +6,29 @@ defmodule Entendu.Application do
   use Application
 
   def start(_type, _args) do
-    children = [
+    # topologies = [
+    #   chat: [
+    #     strategy: Cluster.Strategy.Gossip
+    #   ]
+    # ]
+
+    topologies = [
+      k8s_entendu: [
+        strategy: Elixir.Cluster.Strategy.Kubernetes.DNS,
+          config: [
+            service: "entendu-nodes",
+            application_name: "entendu"
+          ]
+        ]
+      ]
+
+    children = case Application.get_env(:frayt_elixir, :enable_k8s) do
+      true -> [
+        {Cluster.Supervisor, [topologies, [name: Entendu.ClusterSupervisor]]}
+      ]
+      _ -> []
+    end
+    |> Kernel.++([
       # Start the Ecto repository
       Entendu.Repo,
       # Start the Telemetry supervisor
@@ -17,7 +39,7 @@ defmodule Entendu.Application do
       EntenduWeb.Endpoint
       # Start a worker by calling: Entendu.Worker.start_link(arg)
       # {Entendu.Worker, arg}
-    ]
+    ])
 
     # See https://hexdocs.pm/elixir/Supervisor.html
     # for other strategies and supported options

lib/entendu/links.ex

@@ -0,0 +1,104 @@
+defmodule Entendu.Links do
+  @moduledoc """
+  The Links context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Entendu.Repo
+
+  alias Entendu.Links.Link
+
+  @doc """
+  Returns the list of links.
+
+  ## Examples
+
+      iex> list_links()
+      [%Link{}, ...]
+
+  """
+  def list_links do
+    Repo.all(Link)
+  end
+
+  @doc """
+  Gets a single link.
+
+  Raises `Ecto.NoResultsError` if the Link does not exist.
+
+  ## Examples
+
+      iex> get_link!(123)
+      %Link{}
+
+      iex> get_link!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_link!(id), do: Repo.get!(Link, id)
+
+  @doc """
+  Creates a link.
+
+  ## Examples
+
+      iex> create_link(%{field: value})
+      {:ok, %Link{}}
+
+      iex> create_link(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_link(attrs \\ %{}) do
+    %Link{}
+    |> Link.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a link.
+
+  ## Examples
+
+      iex> update_link(link, %{field: new_value})
+      {:ok, %Link{}}
+
+      iex> update_link(link, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_link(%Link{} = link, attrs) do
+    link
+    |> Link.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a link.
+
+  ## Examples
+
+      iex> delete_link(link)
+      {:ok, %Link{}}
+
+      iex> delete_link(link)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_link(%Link{} = link) do
+    Repo.delete(link)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking link changes.
+
+  ## Examples
+
+      iex> change_link(link)
+      %Ecto.Changeset{data: %Link{}}
+
+  """
+  def change_link(%Link{} = link, attrs \\ %{}) do
+    Link.changeset(link, attrs)
+  end
+end

lib/entendu/links/link.ex

@@ -0,0 +1,18 @@
+defmodule Entendu.Links.Link do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  schema "links" do
+    field :burn_after_reading, :boolean, default: false
+    field :expires, :utc_datetime
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(link, attrs) do
+    link
+    |> cast(attrs, [:expires, :burn_after_reading])
+    |> validate_required([:expires, :burn_after_reading])
+  end
+end