feat(server): host channel with token auth and metric events

server/test/server_web/channels/host_channel_test.exs

@@ -0,0 +1,94 @@
+defmodule ServerWeb.HostChannelTest do
+  use ServerWeb.ChannelCase, async: false
+
+  alias Server.Hosts
+  alias ServerWeb.AgentSocket
+
+  setup do
+    {:ok, {host, token}} = Hosts.create_host("pve-01")
+    %{host: host, token: token}
+  end
+
+  describe "join" do
+    test "succeeds with valid token and marks host online", %{host: host, token: token} do
+      {:ok, socket} = connect(AgentSocket, %{})
+
+      assert {:ok, _reply, socket} =
+               subscribe_and_join(socket, "host:pve-01", %{
+                 "token" => token,
+                 "agent_version" => "0.1.0"
+               })
+
+      assert socket.assigns.host_id == host.id
+
+      reloaded = Server.Repo.reload!(host)
+      assert reloaded.status == "online"
+      assert reloaded.agent_version == "0.1.0"
+      assert reloaded.last_seen_at != nil
+    end
+
+    test "rejects invalid token" do
+      {:ok, socket} = connect(AgentSocket, %{})
+
+      assert {:error, %{reason: "invalid_token"}} =
+               subscribe_and_join(socket, "host:pve-01", %{
+                 "token" => "garbage",
+                 "agent_version" => "0.1.0"
+               })
+    end
+
+    test "rejects unknown host name" do
+      {:ok, socket} = connect(AgentSocket, %{})
+
+      assert {:error, %{reason: "unknown_host"}} =
+               subscribe_and_join(socket, "host:nope", %{
+                 "token" => "x",
+                 "agent_version" => "0.1.0"
+               })
+    end
+  end
+
+  describe "metric:fast event" do
+    setup %{token: token} do
+      {:ok, socket} = connect(AgentSocket, %{})
+
+      {:ok, _reply, joined} =
+        subscribe_and_join(socket, "host:pve-01", %{
+          "token" => token,
+          "agent_version" => "0.1.0"
+        })
+
+      %{socket: joined}
+    end
+
+    test "accepts metric payload and replies :ok", %{socket: socket} do
+      ref =
+        push(socket, "metric:fast", %{
+          "collected_at" => "2026-04-21T12:00:00Z",
+          "data" => %{"cpu_percent" => 12.3, "load1" => 0.2}
+        })
+
+      assert_reply ref, :ok
+    end
+  end
+
+  describe "terminate" do
+    test "marks host offline when channel process exits", %{host: host, token: token} do
+      {:ok, socket} = connect(AgentSocket, %{})
+
+      {:ok, _, joined} =
+        subscribe_and_join(socket, "host:pve-01", %{
+          "token" => token,
+          "agent_version" => "0.1.0"
+        })
+
+      Process.unlink(joined.channel_pid)
+      ref = Process.monitor(joined.channel_pid)
+      close(joined)
+      assert_receive {:DOWN, ^ref, :process, _, _}, 1_000
+
+      reloaded = Server.Repo.reload!(host)
+      assert reloaded.status == "offline"
+    end
+  end
+end

server/test/support/channel_case.ex

@@ -0,0 +1,24 @@
+defmodule ServerWeb.ChannelCase do
+  @moduledoc """
+  Test helpers for Phoenix Channels.
+
+  Imports conveniences for testing channels and the sandbox-based Repo so tests
+  run concurrently and are isolated.
+  """
+
+  use ExUnit.CaseTemplate
+
+  using do
+    quote do
+      import Phoenix.ChannelTest
+      import ServerWeb.ChannelCase
+
+      @endpoint ServerWeb.Endpoint
+    end
+  end
+
+  setup tags do
+    Server.DataCase.setup_sandbox(tags)
+    :ok
+  end
+end