api: endpoint for single stack status

lib/ethui/stacks/server.ex

@@ -35,6 +35,12 @@ defmodule Ethui.Stacks.Server do
     GenServer.call(__MODULE__, :list)
   end
 
+  @doc "Check if a stack with the given slug is running"
+  @spec is_slug_running?(slug) :: boolean
+  def is_slug_running?(slug) do
+    GenServer.call(__MODULE__, {:is_slug_running, slug})
+  end
+
   def start(%Stack{} = stack) do
     GenServer.cast(__MODULE__, {:start, stack})
   end
@@ -92,6 +98,11 @@ defmodule Ethui.Stacks.Server do
     {:reply, Map.keys(instances), state}
   end
 
+  @impl GenServer
+  def handle_call({:is_slug_running, slug}, _from, %{instances: instances} = state) do
+    {:reply, Map.has_key?(instances, slug), state}
+  end
+
   @impl GenServer
   def handle_cast({:start, stack}, state) do
     case start_stack(stack, state) do

lib/ethui_web/controllers/api/stack_controller.ex

@@ -32,6 +32,28 @@ defmodule EthuiWeb.Api.StackController do
     })
   end
 
+  def show(conn, %{"slug" => slug}) do
+    user = conn.assigns[:current_user]
+
+    with %Stack{} = stack <- Repo.get_by(Stack, slug: slug),
+         :ok <- authorize_user_access(user, stack) do
+      json(conn, %{
+        status: "success",
+        data: %{
+          slug: stack.slug,
+          urls: Stacks.get_urls(stack),
+          status: if(Server.is_slug_running?(slug), do: "running", else: "stopped")
+        }
+      })
+    else
+      nil ->
+        conn |> put_status(404) |> json(%{status: "error", error: "not found"})
+
+      {:error, :unauthorized} ->
+        conn |> put_status(403) |> json(%{status: "error", error: "unauthorized"})
+    end
+  end
+
   def create(conn, params) do
     user = conn.assigns[:current_user]