app: use normal assigns instead of streams for the server list

app/lib/prymn/agents.ex

@@ -18,8 +18,8 @@ defmodule Prymn.Agents do
   Returns `{:error, reason}` when the connection could not be established
   """
   @spec ensure_connection(String.t()) :: :ok | {:error, term}
-  def ensure_connection(address) do
-    child = {Prymn.Agents.Connection, address}
+  def ensure_connection(public_ip) do
+    child = {Prymn.Agents.Connection, public_ip}
 
     case DynamicSupervisor.start_child(Prymn.Agents.Supervisor, child) do
       {:ok, _pid} -> :ok

app/lib/prymn/agents/connection.ex

@@ -6,11 +6,12 @@ defmodule Prymn.Agents.Connection do
 
   defstruct [:channel, up?: false]
 
-  @ping_interval 20000
-
-  use GenServer, restart: :transient
+  @healthcheck_inverval 20000
 
   require Logger
+  alias PrymnProto.Prymn.Agent.Stub, as: Grpc
+
+  use GenServer, restart: :transient
 
   @spec start_link(String.t()) :: GenServer.on_start()
   def start_link(addr) do
@@ -28,17 +29,16 @@ defmodule Prymn.Agents.Connection do
   end
 
   @impl true
-  def init(addr) do
-    case GRPC.Stub.connect(addr) do
+  def init(public_ip) do
+    case GRPC.Stub.connect("#{public_ip}:50012") do
       {:ok, channel} ->
-        Logger.info("Starting new connection at address #{addr}")
+        send(self(), :do_healthcheck)
 
-        state = %__MODULE__{channel: channel, up?: true}
-
-        Process.send_after(self(), :do_healthcheck, @ping_interval)
-        {:ok, state}
+        {:ok, %__MODULE__{channel: channel, up?: true}}
 
       {:error, error} ->
+        broadcast_healthcheck!(:down, public_ip)
+
         {:stop, error}
     end
   end
@@ -50,50 +50,41 @@ defmodule Prymn.Agents.Connection do
 
   @impl true
   def handle_info({:gun_up, _pid, _protocol}, %{channel: channel} = state) do
-    Logger.info("[Agent] #{state.channel.host} regained connection")
-
-    Phoenix.PubSub.broadcast!(
-      Prymn.PubSub,
-      "agent:#{channel.host}",
-      {:healthcheck, :up, channel.host}
-    )
-
+    broadcast_healthcheck!(:up, channel.host)
     {:noreply, %{state | up?: true}}
   end
 
   @impl true
-  def handle_info({:gun_down, _pid, _proto, reason, _}, %{channel: channel} = state) do
-    Logger.info("[Agent] #{channel.host} lost connection, reason: #{reason}")
-
-    Phoenix.PubSub.broadcast!(
-      Prymn.PubSub,
-      "agent:#{channel.host}",
-      {:healthcheck, :down, channel.host}
-    )
-
+  def handle_info({:gun_down, _pid, _proto, _reason, _}, %{channel: channel} = state) do
+    broadcast_healthcheck!(:down, channel.host)
     {:noreply, %{state | up?: false}}
   end
 
   @impl true
-  def handle_info(:do_healthcheck, %{channel: channel} = state) do
+  def handle_info(:do_healthcheck, %{channel: channel, up?: up?} = state) do
     request = %PrymnProto.Prymn.EchoRequest{message: "hello"}
 
-    case PrymnProto.Prymn.Agent.Stub.echo(channel, request) do
+    if up? do
+      case Grpc.echo(channel, request) do
         {:ok, _reply} ->
-        :noop
+          broadcast_healthcheck!(:up, channel.host)
 
         {:error, error} ->
-        Logger.warning("healthcheck error for server #{channel.host}, reason: #{inspect(error)}")
+          Logger.warning(
+            "healthcheck error for server #{channel.host}, reason: #{inspect(error)}"
+          )
+      end
+    else
+      broadcast_healthcheck!(:down, channel.host)
     end
 
-    Process.send_after(self(), :do_healthcheck, @ping_interval)
+    Process.send_after(self(), :do_healthcheck, @healthcheck_inverval)
     {:noreply, state}
   end
 
   @impl true
   def handle_info(msg, state) do
-    Logger.info("received unexpected message: #{inspect(msg)}")
-
+    Logger.debug("received unexpected message: #{inspect(msg)}")
     {:noreply, state}
   end
 
@@ -105,4 +96,12 @@ defmodule Prymn.Agents.Connection do
   defp via(name) do
     {:via, Registry, {Prymn.Agents.Registry, name}}
   end
+
+  defp broadcast_healthcheck!(msg, ip_address) do
+    Phoenix.PubSub.broadcast!(
+      Prymn.PubSub,
+      "agent:#{ip_address}",
+      {:healthcheck, ip_address, msg}
+    )
+  end
 end

app/lib/prymn/servers.ex

@@ -18,7 +18,7 @@ defmodule Prymn.Servers do
 
   """
   def list_servers do
-    Repo.all(Server)
+    Repo.all(Server |> order_by(desc: :inserted_at))
   end
 
   @doc """

app/lib/prymn_web/components/core_components.ex

@@ -436,8 +436,6 @@ defmodule PrymnWeb.CoreComponents do
   attr :rows, :list, required: true
   attr :row_id, :any, default: nil, doc: "the function for generating the row id"
   attr :row_click, :any, default: nil, doc: "the function for handling phx-click on each row"
-  attr :row_indicator, :any, default: nil
-  attr :indicator_label, :string, default: "Indicator"
 
   attr :row_item, :any,
     default: &Function.identity/1,
@@ -460,11 +458,16 @@ defmodule PrymnWeb.CoreComponents do
       <table class="w-[40rem] mt-11 sm:w-full">
         <thead class="text-left text-sm leading-6 text-zinc-500">
           <tr>
-            <th class="p-0 pb-4 font-normal">
-              <div class="w-min"><%= @indicator_label %></div>
-            </th>
             <th :for={col <- @col} class="p-0 pr-6 pb-4 font-normal"><%= col[:label] %></th>
-            <th class="relative p-0 pb-4"><span class="sr-only"><%= gettext("Actions") %></span></th>
+            <th class="relative p-0 pb-4">
+              <span class="sr-only">
+                <%= if @gettext do %>
+                  <%= gettext("Actions") %>
+                <% else %>
+                  Actions
+                <% end %>
+              </span>
+            </th>
           </tr>
         </thead>
         <tbody
@@ -473,21 +476,13 @@ defmodule PrymnWeb.CoreComponents do
           class="relative divide-y divide-zinc-100 border-t border-zinc-200 text-sm leading-6 text-zinc-700"
         >
           <tr :for={row <- @rows} id={@row_id && @row_id.(row)} class="group hover:bg-zinc-50">
-            <td
-              class="relative w-min p-0 hover:cursor-pointer"
-              phx-click={@row_click && @row_click.(row)}
-            >
-              <div class="block py-4 pr-6">
-                <span class="absolute -inset-y-px right-0 -left-4 group-hover:bg-zinc-50 sm:rounded-l-xl" />
-                <span class="relative hover:cursor-pointer"><%= @row_indicator.(row) %></span>
-              </div>
-            </td>
             <td
               :for={{col, i} <- Enum.with_index(@col)}
               phx-click={@row_click && @row_click.(row)}
               class={["relative p-0", @row_click && "hover:cursor-pointer"]}
             >
               <div class="block py-4 pr-6">
+                <span class="absolute -inset-y-px right-0 -left-4 group-hover:bg-zinc-50 sm:rounded-l-xl" />
                 <span class={["relative", i == 0 && "font-semibold text-zinc-900"]}>
                   <%= render_slot(col, @row_item.(row)) %>
                 </span>

app/lib/prymn_web/live/server_live/index.ex

@@ -1,25 +1,26 @@
 defmodule PrymnWeb.ServerLive.Index do
-  alias Prymn.Servers
+  require Logger
+  alias Prymn.{Servers, Agents}
 
   use PrymnWeb, :live_view
 
   @impl true
   def mount(_params, _session, socket) do
     servers = Servers.list_servers()
-    pid = self()
+    # pid = self()
 
-    for %{public_ip: public_ip} <- servers, public_ip != nil do
-      :ok = Phoenix.PubSub.subscribe(Prymn.PubSub, "agent:#{public_ip}")
+    for %Servers.Server{status: :registered, public_ip: ip} <- servers do
+      :ok = Phoenix.PubSub.subscribe(Prymn.PubSub, "agent:#{ip}")
 
       Task.start_link(fn ->
-        case Prymn.Agents.ensure_connection("#{public_ip}:50012") do
-          :ok -> Process.send(pid, {:healthcheck, :up, public_ip}, [])
-          {:error, _error} -> Process.send(pid, {:healthcheck, :down, public_ip}, [])
+        case Agents.ensure_connection(ip) do
+          :ok -> IO.puts("Ok")
+          _ -> IO.puts("not ok")
         end
       end)
     end
 
-    {:ok, stream(socket, :servers, servers)}
+    {:ok, assign(socket, :servers, servers)}
   end
 
   @impl true
@@ -39,29 +40,34 @@ defmodule PrymnWeb.ServerLive.Index do
 
   @impl true
   def handle_info({:connect, %Servers.Server{} = server}, socket) do
-    {:noreply, stream_insert(socket, :servers, server)}
-  end
-
-  @impl true
-  def handle_info({:healthcheck, status, ip}, socket) do
-    server = Servers.get_server_by_ip!(ip)
-
-    status =
-      case status do
-        :up -> "Connected"
-        :down -> "Disconnected"
-      end
-
     {:noreply,
      socket
-     |> stream_insert(:servers, Map.put(server, :connection_status, status))}
+     |> update(:servers, fn servers -> [server | servers] end)}
   end
 
   @impl true
-  def handle_event("delete", %{"id" => id}, socket) do
-    server = Servers.get_server!(id)
-    {:ok, _} = Servers.delete_server(server)
+  def handle_info({:healthcheck, ip, _message}, socket) do
+    servers =
+      update_in(
+        socket.assigns.servers,
+        [Access.filter(&match?(%{public_ip: ^ip}, &1))],
+        &Map.merge(&1, %{connection_status: "Connected"})
+      )
 
-    {:noreply, stream_delete(socket, :servers, server)}
+    {:noreply, assign(socket, :servers, servers)}
   end
+
+  @impl true
+  def handle_info(msg, state) do
+    Logger.debug("received unexpected message #{inspect(msg)}")
+    {:noreply, state}
+  end
+
+  # @impl true
+  # def handle_event("delete", %{"id" => id}, socket) do
+  #   server = Servers.get_server!(id)
+  #   {:ok, _} = Servers.delete_server(server)
+
+  #   {:noreply, stream_delete(socket, :servers, server)}
+  # end
 end

app/lib/prymn_web/live/server_live/index.html.heex

@@ -1,5 +1,8 @@
 <.header>
-  All available servers to you
+  Your servers
+  <small class="block">
+    <%= "#{Enum.count(@servers)} servers" %>
+  </small>
   <:actions>
     <.link patch={~p"/servers/new"}>
       <.button>Connect a Server</.button>
@@ -7,38 +10,27 @@
   </:actions>
 </.header>
 
-<.table
-  id="servers"
-  rows={@streams.servers}
-  row_click={fn {_id, server} -> JS.navigate(~p"/servers/#{server}") end}
-  row_indicator={
-    fn
-      {_id, %Servers.Server{status: :unregistered}} ->
-        ~H(<span class="text-grey-600">Awaiting registration</span>)
-
-      {_id, %Servers.Server{connection_status: nil, status: :registered}} ->
-        ~H(<span class="text-yellow-600">Connecting...</span>)
-
-      {_id, %Servers.Server{connection_status: "Connected"}} ->
-        ~H(<span class="text-green-600">Connected</span>)
-
-      {_id, %Servers.Server{connection_status: "Disconnected"}} ->
-        ~H(<span class="text-red-600">Disconnected</span>)
-    end
-  }
-  indicator_label="Status"
->
-  <:col :let={{_id, server}} label="Name"><%= server.name %></:col>
-  <:col :let={{_id, server}} label="IP"><%= server.public_ip || "N/A" %></:col>
-  <:action :let={{id, server}}>
+<div class="space-y-5" phx-update="replace" id="servers">
   <.link
-      phx-click={JS.push("delete", value: %{id: server.id}) |> hide("##{id}")}
-      data-confirm="Are you sure?"
+    :for={server <- @servers}
+    navigate={~p"/servers/#{server}"}
+    class="group block rounded-lg bg-gray-100 p-5 shadow-sm shadow-gray-300 hover:bg-black hover:text-white"
   >
-      Delete
+    <div class="flex flex-row flex-wrap justify-between">
+      <h2 class="text-xl"><%= server.name %></h2>
+      <span class="self-center text-sm">
+        <%= if server.status == :registered do %>
+          <%= server.connection_status || "..." %>
+        <% else %>
+          Not registered
+        <% end %>
+      </span>
+    </div>
+    <div class="lg:text-sm">
+      <span>IP: <%= server.public_ip || "N/A" %></span>
+    </div>
   </.link>
-  </:action>
-</.table>
+</div>
 
 <.modal :if={@live_action == :new} id="server-modal" show on_cancel={JS.patch(~p"/servers")}>
   <.live_component module={PrymnWeb.ServerLive.NewServer} id={:new} patch={~p"/servers"} />