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horde_connector.ex
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horde_connector.ex
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defmodule HordeConnector do
@moduledoc File.read!("README.md")
use GenServer
require Logger
def start_link(args, opts \\ []) do
name = Keyword.get(opts, :name, __MODULE__)
GenServer.start_link(__MODULE__, args, name: name)
end
def init(hordes) do
:net_kernel.monitor_nodes(true, node_type: :hidden)
for node <- Node.list(),
horde <- hordes do
join_horde(horde, node)
end
{:ok, hordes}
end
def child_spec(opts) do
registry = Keyword.get(opts, :registry)
supervisor = Keyword.get(opts, :supervisor, Horde.Supervisor)
%{
id: :horde_connector_starter,
restart: :transient,
start:
{Task, :start_link,
[
fn ->
Horde.Supervisor.start_child(supervisor, connector_child_spec(supervisor, registry))
end
]}
}
end
def handle_info({:nodeup, node, _options}, hordes) do
Enum.each(hordes, fn horde -> join_horde(horde, node) end)
{:noreply, hordes}
end
def handle_info({:nodedown, node, _options}, hordes) do
Logger.info("Node #{node} has gone DOWN!")
{:noreply, hordes}
end
def handle_info(unknown_message, state) do
Logger.warn("Unknown message received: #{inspect(unknown_message)}")
{:noreply, state}
end
defp join_horde(horde, node) do
Horde.Cluster.join_hordes(horde, {horde, node})
Logger.info("Node #{node} joining horde #{horde}")
end
defp name(nil), do: __MODULE__
defp name(registry), do: {:via, Horde.Registry, {registry, __MODULE__}}
defp args(supervisor, nil), do: [supervisor]
defp args(supervisor, registry), do: [supervisor, registry]
defp connector_child_spec(supervisor, registry) do
%{
id: __MODULE__,
start: {__MODULE__, :start_link, [args(supervisor, registry), [name: name(registry)]]}
}
end
end