chat_channel.ex 1.3 KB
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defmodule Pleroma.Web.ChatChannel do
  use Phoenix.Channel
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  alias Pleroma.Web.ChatChannel.ChatChannelState
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  alias Pleroma.User
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  def join("chat:public", _message, socket) do
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    send(self(), :after_join)
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    {:ok, socket}
  end

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  def handle_info(:after_join, socket) do
    push socket, "messages", %{messages: ChatChannelState.messages()}
    {:noreply, socket}
  end

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  def handle_in("new_msg", %{"text" => text}, %{assigns: %{user_name: user_name}} = socket) do
    author = User.get_cached_by_nickname(user_name)
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    author = Pleroma.Web.MastodonAPI.AccountView.render("account.json", user: author)
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    message = ChatChannelState.add_message(%{text: text, author: author})
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    broadcast! socket, "new_msg", message
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    {:noreply, socket}
  end
end
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defmodule Pleroma.Web.ChatChannel.ChatChannelState do
  @max_messages 20

  def start_link do
    Agent.start_link(fn -> %{max_id: 1, messages: []} end, name: __MODULE__)
  end

  def add_message(message) do
    Agent.get_and_update(__MODULE__, fn state ->
      id = state[:max_id] + 1
      message = Map.put(message, "id", id)
      messages = [message | state[:messages]] |> Enum.take(@max_messages)
      {message, %{max_id: id, messages: messages}}
    end)
  end

  def messages() do
    Agent.get(__MODULE__, fn state -> state[:messages] |> Enum.reverse end)
  end
end