34 lines
1.1 KiB
Elixir
34 lines
1.1 KiB
Elixir
defmodule Aprsme.PostgresNotifier do
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@moduledoc """
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Listens to PostgreSQL NOTIFY events on the "aprs_events" channel (used by
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bad_packets) and broadcasts them via Phoenix.PubSub.
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Packet notifications previously came through here via the "aprs_packets"
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channel + `packets_notify_insert` trigger. That path was removed to avoid
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per-row trigger overhead and double-broadcasting — packets are now
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broadcast directly from `Aprsme.PacketConsumer` to the same topics.
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"""
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use GenServer
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@event_channel "aprs_events"
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@event_topic "postgres:aprsme_events"
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def start_link(_opts) do
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GenServer.start_link(__MODULE__, nil, name: __MODULE__)
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end
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@impl true
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def init(_) do
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{:ok, conn} = Postgrex.Notifications.start_link(Aprsme.Repo.config())
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{:ok, _ref} = Postgrex.Notifications.listen(conn, @event_channel)
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{:ok, %{conn: conn}}
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end
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@impl true
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def handle_info({:notification, _conn, _pid, @event_channel, payload}, state) do
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Phoenix.PubSub.broadcast(Aprsme.PubSub, @event_topic, {:postgres_notify, payload})
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{:noreply, state}
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end
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def handle_info(_msg, state), do: {:noreply, state}
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end
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