Recently there is a demand: the front page hits tasks, back-end implementation of real-time display, a wave of thinking; find WebSocket
the most suitable to do it.
effect
Test ping www.baidu.com
results
Click Connect to establish connection ws
Back-end implementation
Required packages
With the rear end of the main Django
Channels
achieve socket connection, the official website of document links
Here I would like to join the group came to realize each connection to broadcast, so it is necessary to introduce channels-redis
.
pip
channels==2.2.0
channels-redis==2.4.0
Introduced
settings.py
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'rest_framework.authtoken',
'rest_framework',
...
'channels',
]
# Redis配置
REDIS_HOST = ENV_DICT.get('REDIS_HOST', '127.0.0.1')
REDIS_PORT = ENV_DICT.get('REDIS_PORT', 6379)
CHANNEL_LAYERS = {
"default": {
"BACKEND": "channels_redis.core.RedisChannelLayer",
"CONFIG": {
"hosts": [(REDIS_HOST, REDIS_PORT)],
},
},
}
Code
apps/consumers.py
Create a consumer process
Implementation: default connection to join a group, processing the message.
from channels.generic.websocket import WebsocketConsumer
class MyConsumer(WebsocketConsumer):
def connect(self):
"""
每个任务作为一个频道
默认进入对应任务执行频道
"""
self.job_name = self.scope['url_route']['kwargs']['job_name']
self.job_group_name = 'job_%s' % self.job_name
async_to_sync(self.channel_layer.group_add)(
self.job_group_name,
self.channel_name
)
self.accept()
def disconnect(self, close_code):
async_to_sync(self.channel_layer.group_discard)(
self.job_group_name,
self.channel_name
)
# job.message类型处理
def job_message(self, event):
# 默认发送收到信息
self.send(text_data=event["text"])
apps/routing.py
ws types of routing
Achieved: ws / job / <job_name> the MyConsumer
process goes.
from . import consumers
from django.urls import path
from channels.routing import ProtocolTypeRouter, URLRouter
from channels.sessions import SessionMiddlewareStack
application = ProtocolTypeRouter({
'websocket': SessionMiddlewareStack(
URLRouter(
[
path('ws/job/<str:job_name>', consumers.MyConsumer)
]
)
),
})
apps/views.py
In order to obtain the implementation of the
webSocket
consumer channel, asynchronous push
- Using asynchronous push
async_to_sync
because the connection when used asynchronous connection, it must be an asynchronous push push. - Because the mission too long, start adding multi-threading trigger operation, the first direct return
ok
, run the back-end tasks.
from subprocess import Popen,PIPE
import threading
def runPopen(job):
"""
执行命令,返回popen
"""
path = os.path
Path = path.abspath(path.join(BASE_DIR, path.pardir))
script_path = path.abspath(path.join(Path,'run.sh'))
cmd = "sh %s %s" % (script_path, job)
return Popen(cmd, shell=True, stdout=PIPE, stderr=PIPE)
def runScript(job):
channel_layer = get_channel_layer()
group_name = "job_%s" % job
popen = runPopen(job)
while True:
output = popen.stdout.readline()
if output == '' and popen.poll() is not None:
break
if output:
output_text = str(output.strip())
async_to_sync(
channel_layer.group_send
)(
group_name,
{"type": "job.message", "text": output_text}
)
else:
err = popen.stderr.readline()
err_text = str(err.strip())
async_to_sync(
channel_layer.group_send
)(
group_name,
{"type": "job.message", "text": err_text}
)
break
class StartJob(APIView):
def get(self, request, job=None):
run = threading.Thread(target=runScript, args=(job,))
run.start()
return HttpResponse('ok')
apps/urls.py
get request can start the task
urlpatterns = [
...
path('start_job/<str:job>', StartJob.as_view())
]
Front-end implementation
Required packages
vue-native-websocket
Code
plugins/vueNativeWebsocket.js
import Vue from 'vue'
import VueNativeSock from '../utils/socket/Main.js'
export default function ({ store }) {
Vue.use(VueNativeSock, 'http://localhost:8000/ws/job', {connectManually: true,});
}
nuxt.config.js
Profile introduction, I am using here is the
nuxt
framework
plugins: [
{
src: '@/plugins/vueNativeWebsocket.js',
***: false
},
],
Packagesocket
export default (connection_url, option) => {
// 事件
let event = ['message', 'close', 'error', 'open'];
// 拷贝选项字典
let opts = Object.assign({}, option);
// 定义实例字典
let instance = {
// socket实例
socket: '',
// 是否连接状态
is_conncet: false,
// 具体连接方法
connect: function() {
if(connection_url) {
let scheme = window.location.protocol === 'https:' ? 'wss' : 'ws'
connection_url = scheme + '://' + connection_url.split('://')[1];
this.socket = new WebSocket(connection_url);
this.initEvent();
}else{
console.log('wsurl為空');
}
},
// 初始化事件
initEvent: function() {
for(let i = 0; i < event.length; i++){
this.addListener(event[i]);
}
},
// 判断事件
addListener: function(event) {
this.socket.addEventListener(event, (e) => {
switch(event){
case 'open':
this.is_conncet = true;
break;
case 'close':
this.is_conncet = false;
break;
}
typeof opts[event] == 'function' && opts[event](e);
});
},
// 发送方法,失败则回调
send: function(data, closeCallback) {
console.log('socket ---> ' + data)
if(this.socket.readyState >= 2) {
console.log('ws已经关闭');
closeCallback && closeCallback();
}else{
this.socket.send(data);
}
}
};
// 调用连接方法
instance.connect();
return instance;
}
index.vue
Specific code
x2Str
Method, because the back-end returns bytes, formatb'xxx'
, write a method to convert them.
<template>
<div>
<el-button type="primary" @click="runFunction" >执行</el-button>
<el-button type="primary" @click="connectWebSock" >显示</el-button>
<div class="socketView">
<span v-for="i in socketMessage" :key="i">{{i}}</span>
</div>
</div>
</template>
<script>
import R from '@/plugins/axios';
import ws from '@/plugins/socket'
export default {
data() {
return {
webSocket: '',
socketMessage: [],
}
},
methods: {
// 打开连接的处理
openSocket(e) {
if (e.isTrusted) {
const h = this.$createElement;
this.$notify({
title: '提示',
message: h('i', { style: 'color: teal'}, '已建立Socket连接')
});
}
},
// 连接时的处理
listenSocket(e) {
if (e.data){
this.socketMessage.push(this.x2Str(e.data))
}
},
// 连接webSocket
connectWebSock() {
let wsuri = process.env.BACKEND_URL + '/ws/job/' + this.selectFunctions
this.webSocket = ws(wsuri, {
open: e => this.openSocket(e),
message: e => this.listenSocket(e),
close: e => this.closeSocket(e)
})
},
// 转码
x2Str(str) {
if (str) {
let reg = new RegExp("(?<=^b').*(?='$)")
let result = str.replace(/(?:\\x[\da-fA-F]{2})+/g, m =>
decodeURIComponent(m.replace(/\\x/g, '%'))
)
return reg.exec(result)[0]
}
},
// 执行方法
runFunction() {
R.myRequest('GET','api/start_job/' + this.selectFunctions, {}, {}).then((response) => {
if (response.hasOwnProperty('response')){
this.$message({
type: 'error',
message: '服务端返回错误,返回码:' + response.response.status
});
};
if (response.data == 'ok') {
this.$message({
type: 'success',
message: '开始执行[' + this.selectFunctions + ']'
});
}
});
}
}
}
</script>
At this point, the front and rear end to realize websocket
communication.