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我想向我的 Phoenix 应用程序的用户频道发送消息。我已经加入了一个 user_token 与频道，users:user_token如user_channel.ex. toy_controller我通过调用广播方法从另一个名为 the 的控制器成功地做到了这一点。广播方式在用户频道。我已经编写了一个 jQuery 文件来处理这些事件。我一直在寻找可以从项目外部向同一频道发送消息的东西，因为我想做一些物联网的事情。我尝试了一个名为的 python 模块occamy.socket和它在内部使用的 Phoenix 的 JS 客户端。然后，我发现总是断线。我无法弄清楚 Phoenix 的 websocket 连接的确切地址。如果我在该项目文件夹本身中使用 Phoenix npm 库进行尝试，它会说ReferenceError: window is not defined总是。而且，我认为这是因为文件中套接字的初始化部分web/static/js/socket.js写为 

let socket = new Socket("/socket", {params: {token: window.userToken}})

，但我不确定。我尝试过的东西如下

var Socket = require("phoenix-socket").Socket;
var socket = new Socket("ws://localhost:4000/socket");

在 python 客户端中，我也尝试连接到该地址，但出现断开连接错误。我想为物联网目的做这件事，我想监控用户的传感器数据。每个用户都将拥有自己的传感器进行监控。因此，我已将频道topic:subtopic频道配置为users:user_token. 我需要使用用户的那些独特令牌将消息从我的树莓派发送到这个频道。下面给出了我的 user_channel、user.js、app.js 和 socket.js。

//web/static/js/socket.js
import {Socket} from "phoenix"

let socket = new Socket("/socket", {params: {token: window.userToken}})


socket.connect()


export default socket

//web/static/app.js


import "phoenix_html"
import user from "./user"

#web/channels/user_channel.ex
defmodule Tworit.UserChannel do
    use Tworit.Web, :channel

    def join("users:" <> user_token, payload, socket) do
        if authorized?(payload) do
          {:ok, "Joined To User:#{user_token}", socket}
      else
          {:error, %{reason: "unauthorized"}}
      end
    end


    def handle_in("ping", payload, socket) do
        {:reply, {:ok, payload}, socket}
    end


    def handle_in("shout", payload, socket) do
       broadcast socket, "shout", payload
       {:noreply, socket}
    end


    def handle_out(event, payload, socket) do
        push socket, event, payload
        {:noreply, socket}
    end


     defp authorized?(_payload) do
       true
     end

    def broadcast_change(toy, current_user) do
       payload = %{
        "name" => toy.name,
        "body" => toy.body
       }
      Tworit.Endpoint.broadcast("users:#{current_user.token}", "change", payload)
    end

end


//web/static/js/user.js
import socket from "./socket"

$(function() {
  let ul = $("ul#em")

  if (ul.length) {
    var token = ul.data("id")
    var topic = "users:" + token
		
    // Join the topic
    let channel = socket.channel(topic, {})
    channel.join()
      .receive("ok", data => {
        console.log("Joined topic", topic)
      })
      .receive("error", resp => {
        console.log("Unable to join topic", topic)
      })
    channel.on("change", toy => {
	    console.log("Change:", toy);
	    $("#message").append(toy["name"])
    })
  }
});

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1 回答 1

3

最后，我能够从 python 程序异步发送和接收消息。它使用来自 python 的 websockets asyncio 模块。我想出了凤凰频道所需的各种事件，比如“phx_join”加入一个主题等等。因此，以下程序有效。

import asyncio
import websockets
import json
import time
from random import randint
import serial

from pyfirmata import Arduino, util

board = Arduino('/dev/ttyACM1')

it = util.Iterator(board)
it.start()
board.analog[0].enable_reporting()
board.analog[1].enable_reporting()
board.analog[2].enable_reporting()
board.analog[3].enable_reporting()

import RPi.GPIO as gpio

gpio.setmode(gpio.BCM)
gpio.setup(14, gpio.OUT)


async def main():
    async with websockets.connect('ws://IP_addr:4000/socket/websocket') as websocket:
        data = dict(topic="users:user_token", event="phx_join", payload={}, ref=None)
        #this method joins the phoenix channel
        await websocket.send(json.dumps(data))

        print("Joined")

        while True:
            msg = await retrieve() # waits for data from arduino analog pins
            await websocket.send(json.dumps(msg)) # sends the sensor output to phoenix channel

            print("sent")
            call = await websocket.recv() # waits for anything from the phoenix server
            control = json.loads(call)

            # I have sent values from 2 buttons for swicthing a led with event 'control'

            if(control['event'] == "control"):
                event(control['payload']['val']) #swiches the led as per the input from event 'control'


            print("< {}".format(call))

def event(val):
    if(val == "on"):
        gpio.output(14, True)
    if(val == "off"):
        gpio.output(14, False)

async def retrieve():
    #analog read
    load = board.analog[0].read()
    pf = board.analog[1].read()
    reading = board.analog[2].read()
    thd = board.analog[3].read()
    output = {"load": load, "pf": pf, "reading": reading,"thd": thd}

    msg = dict(topic="users:user_token", event="sensor_output", payload=output, ref=None) # with 
    #event "sensor_outputs" 
    #the phoenix server displays the data on to a page.

    print(msg)
    return(msg)

asyncio.get_event_loop().run_until_complete(main())
asyncio.get_event_loop().run_forever()
于 2016-07-30T12:10:53.200 回答