凤凰频道:向特定客户发送推送 [英] Phoenix channels: send push to a particular client

问题描述

我正在尝试使用长寿凤凰重新实现whatsapp的功能.我在解决以下问题时遇到了问题:如果聊天室中的所有人都收到了消息，我想发送消息状态为已接收"的所有者，以便他可以显示双勾号.但是，您如何向一个特定的客户广播?

Hi I am trying to reimplement whatsapp functionality using elixir phoenix. I am having a problem figuring out the following: if all people in the chat room has received the message, I want to send the owner of the message status "received" so that he can show double tick sign. However how do you broadcast to one particular client?

推荐答案

您可以通过每个用户的主题来解决此问题，这可以通过模式匹配轻松实现，还请注意安全性验证:

You can solve this via topic per user, this can be easily implemented by pattern matching, notice the security validation also:

def join("users:" <> user_id, _params, socket) do
    {user_id, _} = Integer.parse(user_id)

    %{id: id} = socket.assigns[:user]

    #prevent connection to solo channel of other users, but allow in development
    case id == user_id || Mix.env == :dev do
      true ->
        {:ok, socket}
      false ->
        {:error, "This is not your solo channel!"}
      end
  end

就像当用户在以下位置将套接字连接到

As you would have stored the user from Repo.get when the user connect to the socket at:

defmodule MyApp.UserSocket do
  use Phoenix.Socket

  def connect(%{"token" => token}, socket) do
    case Phoenix.Token.verify(socket, "user", token, max_age: 1209600) do
      {:ok, user_id} ->
        socket = assign(socket, :user, Repo.get!(User, user_id))
        {:ok, socket}
      {:error, _} -> #...
    end
  end
end

最后，您可以通过套接字上下文向特定用户发送消息，如下所示:

And finally, you can send messages to a specific user out of socket context as:

YourAll.Endpoint.broadcast user_topic, "message", %{details: "etc"}

要测试性能，这是一个非常有用的会议，其中Gary Rennie展示了如何使用Tsung工具对WebSocket进行基准测试.

To test the performance, this is a very informative session in which Gary Rennie shows how to benchmark WebSockets using Tsung tool.

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