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Added manager node monitor #827

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Added manager node monitor #827

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1 change: 1 addition & 0 deletions apps/remote_control/lib/lexical/remote_control/application.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ defmodule Lexical.RemoteControl.Application do
children =
if RemoteControl.project_node?() do
[
RemoteControl.ManagerNodeMonitor,
RemoteControl.Api.Proxy,
RemoteControl.Commands.Reindex,
RemoteControl.Module.Loader,
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43 changes: 43 additions & 0 deletions apps/remote_control/lib/lexical/remote_control/manager_node_monitor.ex
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Original file line number Diff line number Diff line change
@@ -0,0 +1,43 @@
defmodule Lexical.RemoteControl.ManagerNodeMonitor do
@moduledoc """
A node monitor that monitors the manager node for this project, and shuts down
the system if that node dies.
"""
use GenServer
require Logger

def start_link(_) do
GenServer.start_link(__MODULE__, nil, name: __MODULE__)
end

@impl true
def init(_) do
case fetch_manager_node() do
{:ok, manager_node} ->
Node.monitor(manager_node, true)
{:ok, manager_node}

:error ->
Logger.warning("Could not determine manager node for monitoring.")
:ignore
end
end

@impl true
def handle_info({:nodedown, _}, state) do
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I think state is the manager node here, maybe this is worth doing?

Suggested change
def handle_info({:nodedown, _}, state) do
def handle_info({:nodedown, manager}, manager) do

spawn(fn -> System.stop() end)
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{:noreply, state}
end

defp fetch_manager_node do
Enum.find_value(Node.list(), :error, fn node_name ->
string_name = Atom.to_string(node_name)

if String.starts_with?(string_name, "manager-") do
{:ok, node_name}
else
false
end
end)
end
end
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