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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more

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phoenix_kit lib phoenix_kit notifications events.ex
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lib/phoenix_kit/notifications/events.ex 

defmodule PhoenixKit.Notifications.Events do

  @moduledoc """

  PubSub topic helpers for the notifications feature.



  Each recipient has their own topic so broadcasts don't fan out to unrelated

  LiveViews. Topic shape: `"phoenix_kit:notifications:<user_uuid>"`.



  Events sent to these topics:



    * `{:notification_created, %Notification{}}`

    * `{:notification_seen, %Notification{}}`

    * `{:notification_dismissed, %Notification{}}`

  """



  alias PhoenixKit.PubSub.Manager, as: PubSub



  @topic_prefix "phoenix_kit:notifications"



  @doc "Returns the per-user PubSub topic."

  def topic_for_user(user_uuid) when is_binary(user_uuid) do

    "#{@topic_prefix}:#{user_uuid}"

  end



  @doc "Subscribes the calling process to a user's notification topic."

  def subscribe(user_uuid) when is_binary(user_uuid) do

    PubSub.subscribe(topic_for_user(user_uuid))

  end



  @doc "Unsubscribes the calling process from a user's notification topic."

  def unsubscribe(user_uuid) when is_binary(user_uuid) do

    PubSub.unsubscribe(topic_for_user(user_uuid))

  end



  @doc "Broadcasts an event to a user's notification topic. Never raises."

  def broadcast(user_uuid, message) when is_binary(user_uuid) do

    PubSub.broadcast(topic_for_user(user_uuid), message)

  rescue

    _ -> :ok

  end

end