Graham McIntire
b0832e5a9c
Some checks failed
Build and Push / Build and Push Docker Image (push) Failing after 2s
57 lines
1.5 KiB
Elixir
57 lines
1.5 KiB
Elixir
defmodule Aprsme.Cluster.PacketDistributor do
|
|
@moduledoc """
|
|
Distributes APRS packets from the leader node to all cluster members.
|
|
This ensures all nodes can serve real-time updates via LiveView while
|
|
only the leader maintains the APRS-IS connection.
|
|
"""
|
|
use GenServer
|
|
|
|
alias Aprsme.Cluster.LeaderElection
|
|
|
|
@pubsub_topic "cluster:packets"
|
|
|
|
def start_link(opts) do
|
|
GenServer.start_link(__MODULE__, opts, name: __MODULE__)
|
|
end
|
|
|
|
def distribute_packet(packet) do
|
|
cluster_enabled = Application.get_env(:aprsme, :cluster_enabled, false)
|
|
maybe_broadcast(cluster_enabled and LeaderElection.leader_cached?(), packet)
|
|
end
|
|
|
|
# Only the leader broadcasts; non-leader clustered nodes and non-clustered
|
|
# nodes silently drop the packet.
|
|
defp maybe_broadcast(true, packet) do
|
|
Phoenix.PubSub.broadcast(Aprsme.PubSub, @pubsub_topic, {:distributed_packet, packet})
|
|
end
|
|
|
|
defp maybe_broadcast(false, _packet), do: :ok
|
|
|
|
def subscribe do
|
|
Phoenix.PubSub.subscribe(Aprsme.PubSub, @pubsub_topic)
|
|
end
|
|
|
|
def handle_distributed_packet({:distributed_packet, packet}) do
|
|
Aprsme.SpatialPubSub.broadcast_packet(packet)
|
|
|
|
:ok
|
|
end
|
|
|
|
@impl true
|
|
def handle_info({:distributed_packet, _packet} = msg, state) do
|
|
handle_distributed_packet(msg)
|
|
{:noreply, state}
|
|
end
|
|
|
|
@impl true
|
|
def init(_opts) do
|
|
:ok = Phoenix.PubSub.subscribe(Aprsme.PubSub, @pubsub_topic)
|
|
{:ok, %{}}
|
|
end
|
|
|
|
@impl true
|
|
def terminate(_reason, _state) do
|
|
_ = Phoenix.PubSub.unsubscribe(Aprsme.PubSub, @pubsub_topic)
|
|
:ok
|
|
end
|
|
end
|