Vue+Koa2+mongoose写一个像素绘板的实现方法

# centos 前置条件
sudo yum install gcc-c++ cairo cairo-devel pango-devel libjpeg-turbo-devel giflib-devel
# 安装本体
yarn add canvas -D

const {
 createCanvas,
 createImageData
} = require('canvas')

const canvas = createCanvas(canvasWidth, canvasHeight)
const ctx = canvas.getContext('2d')

// 初始化
const init = callback => {
 Dot.queryDots().then(data => {
  let imgData = new createImageData(
   Uint8ClampedArray.from(data),
   canvasWidth,
   canvasHeight
  )

  // 移除 Smooth
  ctx.mozImageSmoothingEnabled = false
  ctx.webkitImageSmoothingEnabled = false
  ctx.msImageSmoothingEnabled = false
  ctx.imageSmoothingEnabled = false
  ctx.putImageData(imgData, 0, 0, 0, 0, canvasWidth, canvasHeight)

  successLog('canvas render complete !')

  callback()
 })
}

// socket.io init
// transports: [ 'websocket' ]
window.socket = io.connect(window.location.origin.replace(/https/, 'wss'))

// 接收图片
window.socket.on('dataUrl', data => {
 this.imageObject.src = data.url
 this.loadInfo.push('渲染图像...')

 this.init()
})

// 接收其他用户建点
window.socket.on('newDot', data => {
 this.saveDot(
  {
   x: data.index % this.width,
   y: Math.floor(data.index / this.width),
   color: data.color
  },
  false
 )
})

// 接收所有人的最新推送消息
window.socket.on('newChat', data => {
 if (this.msgs.length === 50) {
  this.msgs.shift()
 }

 this.msgs.push(data)
})

let http = require('http');
let io = require('socket.io')
let server = http.createServer(app.callback())
let ws = io.listen(server)
server.listen(port)

ws.on('connection', socket => {
 // 建立连接的 client 加入房间 chatroom ，为了下方可以广播
 socket.join('chatroom')

 socket.emit('dataUrl', {
  url: cv.getDataUrl()
 })

 socket.on('saveDot', async data => {
  // 推送给其他用户，即广播
  socket.broadcast.to('chatroom').emit('newDot', data)
  saveDotHandle(data)
 })

 socket.on('newChat', async data => {
  // 推送给所有用户
  ws.sockets.emit('newChat', data)
  newChatHandle(data)
 })
})

# 获得程序
git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt
# 自动生成证书(环境安装完毕后会有两次确认),证书目录 /etc/letsencrypt/live/{输入的第一个域名} 我这里是 /etc/letsencrypt/live/www.luwuer.com/
./letsencrypt-auto certonly --standalone --email html6@foxmail.com -d www.luwuer.com -d luwuer.com

# 进入定时任务编辑
crontab -e
# 提交申请，我这里设置每两月一次，过期时间为三月
* * * */2 * cd /root/certificate/letsencrypt && ./letsencrypt-auto certonly --renew

yum install -y nginx

server {
 # 使用 HTTP/2，需要 Nginx1.9.7 以上版本
 listen 443 ssl http2 default_server;

 # 开启HSTS，并设置有效期为“6307200秒”（6个月），包括子域名(根据情况可删掉)，预加载到浏览器缓存(根据情况可删掉)
 add_header Strict-Transport-Security "max-age=6307200; preload";
 # add_header Strict-Transport-Security "max-age=6307200; includeSubdomains; preload";
 # 禁止被嵌入框架
 add_header X-Frame-Options DENY;
 # 防止在IE9、Chrome和Safari中的MIME类型混淆攻击
 add_header X-Content-Type-Options nosniff;
 # ssl 证书
 ssl_certificate /etc/letsencrypt/live/www.luwuer.com/fullchain.pem;
 ssl_certificate_key /etc/letsencrypt/live/www.luwuer.com/privkey.pem;
 # OCSP Stapling 证书
 ssl_trusted_certificate /etc/letsencrypt/live/www.luwuer.com/chain.pem;
 # OCSP Stapling 开启，OCSP是用于在线查询证书吊销情况的服务，使用OCSP Stapling能将证书有效状态的信息缓存到服务器，提高TLS握手速度
 ssl_stapling_verify on;
 #OCSP Stapling 验证开启
 ssl_stapling on; 
 #用于查询OCSP服务器的DNS 
 resolver 8.8.8.8 8.8.4.4 valid=300s;
 # DH-Key交换密钥文件位置
 ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
 # 指定协议 TLS
 ssl_protocols TLSv1 TLSv1.1 TLSv1.2; 
 # 加密套件,这里用了CloudFlare's Internet facing SSL cipher configuration
 ssl_ciphers EECDH+CHACHA20:EECDH+CHACHA20-draft:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;
 # 由服务器协商最佳的加密算法
 ssl_prefer_server_ciphers on;

 server_name ~^(\w+\.)"upgrade";
 }

 # location /weibo/ {
 #   proxy_pass https://api.weibo.com/;
 # }

 include /etc/nginx/utils/cache.conf;
}

server {
 listen 80;
 server_name www.luwuer.com;
 rewrite ^(.*)$ https://$server_name$request_uri;
}

const mongoose = require('mongoose')

let schema = new mongoose.Schema({
 index: {
  type: Number,
  index: true
 },
 r: Number,
 g: Number,
 b: Number
}, {
 collection: 'dots'
})