Hello!

In my application, I have two apps called market_manager and candle_manager.

In app candle_manager, I have this tree structure:

011067×120 40.4 KB

041452×175 79.1 KB

So, for example, if Manager has PID <0.612.0> and CandleManager.Bitfinex.Realtime.Supervisor PID <0.613.0> there will be a link between these two (I can confirm via :observer).

Now, if I go to :observer and kill CandleManager.Bitfinex.Realtime.Supervisor, then Manager will receive the exit message and kill itself too (as expected).

But, if I kill the Manager instead, CandleManager.Bitfinex.Realtime.Supervisor is not killed and Manager will fail to restart since it will try to start a new CandleManager.Bitfinex.Realtime.Supervisor and fail with :already_started error.

So, my question is, does Process.link work correctly with Supervisors? How can I make CandleManager.Bitfinex.Realtime.Supervisor kill itself when Manager is killed?

Just for completeness, here is CandleManager.Bitfinex.Realtime.Supervisor code, it doesn’t have anything fancy that I can see breaking the Process.link logic.

defmodule CandleManager.Bitfinex.Realtime.Supervisor do
  use Supervisor

  alias CandleManager.Bitfinex.Realtime

  require Logger
  def start_link(args) do
    Supervisor.start_link(__MODULE__, args, name: __MODULE__)
  end

  @impl Supervisor
  def init([market_manager_pid: _pid] = args) do
    childrens = [
      {Realtime.Websocket.Server, []},
      {Realtime.Manager.Server, []},
      {Realtime.TradeToCandle.Server, []},
      {Realtime.TradeDiscarder.Server, args}
    ]

    Supervisor.init(childrens, strategy: :one_for_all, max_restarts: 0)
  end
end

Thanks!