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walex

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Listen to change events on your Postgres tables then perform callback-like actions with the data.

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walex lib walex events.ex
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lib/walex/events.ex 

defmodule WalEx.Events do

  use GenServer



  def start_link(process_event) do

    GenServer.start_link(__MODULE__, process_event, name: __MODULE__)

  end



  def process(txn) do

    GenServer.call(__MODULE__, {:process, txn}, :infinity)

  end



  @impl true

  def init(state) do

    {:ok, state}

  end



  @impl true

  def handle_call({:process, txn}, _from, state) do

    process_events(state, txn)

    {:reply, :ok, state}

  end



  defp process_events([module: modules], txn) when is_list(modules) do

    Enum.each(modules, fn module -> apply(module, :process, [txn]) end)

  end



  defp process_events([module: module], txn), do: apply(module, :process, [txn])



  defp process_events(nil, %{changes: [], commit_timestamp: _}), do: nil

end