44 lines
1.3 KiB
Elixir
44 lines
1.3 KiB
Elixir
defmodule Aprs.PostgresNotifier do
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@moduledoc """
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Listens to PostgreSQL NOTIFY events on the "aprs_events" and "aprs_packets" channels and broadcasts
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them via Phoenix.PubSub for reactive, event-driven updates.
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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:aprs_events"
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@packet_channel "aprs_packets"
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@packet_topic "postgres:aprs_packets"
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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(Aprs.Repo.config())
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{:ok, _ref1} = Postgrex.Notifications.listen(conn, @event_channel)
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{:ok, _ref2} = Postgrex.Notifications.listen(conn, @packet_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(Aprs.PubSub, @event_topic, {:postgres_notify, payload})
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{:noreply, state}
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end
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def handle_info({:notification, _conn, _pid, @packet_channel, payload}, state) do
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case Jason.decode(payload) do
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{:ok, packet} ->
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Phoenix.PubSub.broadcast(Aprs.PubSub, @packet_topic, {:postgres_packet, packet})
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_ ->
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:noop
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end
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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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