feat(server): GET /api/hosts/:name returns latest fast/medium/slow samples

server/lib/server_web/controllers/host_controller.ex

@@ -0,0 +1,30 @@
+defmodule ServerWeb.HostController do
+  use ServerWeb, :controller
+
+  alias Server.{Metrics, Repo, Schema.Host}
+
+  def show(conn, %{"name" => name}) do
+    case Repo.get_by(Host, name: name) do
+      nil ->
+        conn
+        |> put_status(:not_found)
+        |> json(%{error: "host_not_found"})
+
+      %Host{} = host ->
+        samples =
+          for interval <- ~w(fast medium slow),
+              sample = Metrics.latest_sample(host.id, interval),
+              into: %{} do
+            {interval, %{collected_at: sample.collected_at, payload: sample.payload}}
+          end
+
+        json(conn, %{
+          name: host.name,
+          status: host.status,
+          agent_version: host.agent_version,
+          last_seen_at: host.last_seen_at,
+          samples: samples
+        })
+    end
+  end
+end

server/lib/server_web/router.ex

@@ -20,10 +20,11 @@ defmodule ServerWeb.Router do
     get "/", PageController, :home
   end
 
-  # Other scopes may use custom stacks.
-  # scope "/api", ServerWeb do
-  #   pipe_through :api
-  # end
+  scope "/api", ServerWeb do
+    pipe_through :api
+
+    get "/hosts/:name", HostController, :show
+  end
 
   # Enable LiveDashboard in development
   if Application.compile_env(:server, :dev_routes) do

server/test/server_web/controllers/host_controller_test.exs

@@ -0,0 +1,36 @@
+defmodule ServerWeb.HostControllerTest do
+  use ServerWeb.ConnCase, async: true
+
+  alias Server.{Hosts, Metrics}
+
+  describe "GET /api/hosts/:name" do
+    setup do
+      {:ok, {host, _token}} = Hosts.create_host("pve-01")
+
+      {:ok, _} =
+        Metrics.record_sample(
+          host.id,
+          "fast",
+          DateTime.utc_now(),
+          %{"host" => %{"load1" => 0.5}}
+        )
+
+      %{host: host}
+    end
+
+    test "returns host info and latest samples", %{conn: conn, host: host} do
+      conn = get(conn, ~p"/api/hosts/#{host.name}")
+
+      assert %{
+               "name" => "pve-01",
+               "status" => _,
+               "samples" => %{"fast" => %{"payload" => %{"host" => %{"load1" => 0.5}}}}
+             } = json_response(conn, 200)
+    end
+
+    test "returns 404 for unknown host", %{conn: conn} do
+      conn = get(conn, ~p"/api/hosts/nope")
+      assert json_response(conn, 404) == %{"error" => "host_not_found"}
+    end
+  end
+end