.OpenNJet应用引擎实践——从 0-1 体验感受

一. 🦁 写在前面

现在互联网体系越来越往云原生方向进发，云原生组件的地位也逐渐水涨船高，比如阿里研发的Higress 网关,无感聚合项目端口，统一分发到各个子服务，很好地替代了SpringCloud Gateway。
今天狮子又来给大家介绍一款应用引擎层面的云原生神器——OpenNJet，它是面向互联网和云原生应用提供的运行时组态服务程序。具备环境感知、安全控制、加速优化等能力，一般呈现为Web服务、流媒体服务、代理(Proxy)、应用中间件、API网关、消息队列等产品形态。

应用引擎在云原生架构中，除了提供南北向通信网关的功能以外，因为提供了服务网格中东西向通信、透明流量劫持、熔断、遥测与故障注入等新功能特性，其地位和作用在云原生架构中变得愈发重要。

体验官网链接：https://njet.org.cn/

在这里插入图片描述

现在狮子来给读者详细介绍一下体验过程：

二. 🦁 安装使用

OpenNJet应用引擎是基于 C/C++ 语言编写，需要先编译再运行。

2.1 安装环境

我这里使用的是腾讯云服务器 Centos7.9，所以使用Centos的安装方法。

2.2 配置yum源

sudo yum --enablerepo=extras install -q -y epel-release centos-release-scl-rh https://repo.ius.io/ius-release-el7.rpm

sudo curl -o /etc/yum.repos.d/mercurial.repo https://www.mercurial-scm.org/release/centos7/mercurial.repo

配置完yum源，/etc/yum.repos.d 会生成相对于的 repo 文件。
在这里插入图片描述

2.3 安装软件包

sudo yum install -y devtoolset-8-make devtoolset-8-toolchain ca-certificates mercurial zlib-devel cmake3 ninja-build libunwind-devel pcre-devel openssl-devel libtool libtool-ltdl

安装成功结果：
在这里插入图片描述
创建符号连接：

sudo ln -s /opt/rh/devtoolset-8/root/usr/bin/gcc /usr/local/bin/gcc
sudo ln -s /opt/rh/devtoolset-8/root/usr/bin/c++ /usr/local/bin/c++
sudo ln -s /opt/rh/devtoolset-8/root/usr/bin/cc /usr/local/bin/cc
sudo ln -s /opt/rh/devtoolset-8/root/usr/bin/make /usr/local/bin/make

2.4 编译代码

第一步执行：

sh build_cc.sh conf

第二步执行：

make

在这里插入图片描述

tips:
文件太大了，编译时间会有点长，耐心等待哟！

第三步执行：

make install

在这里插入图片描述
这样就安装成功了！！

2.5 启动

 cd /usr/local/njetsbin/njet

tips:
有小伙伴可能看到官网教程使用的是直接
sudo systemctl start njet 启动，显示 njet not found的结果，这是因为通过源码编译安装的，可执行文件及相关的配置文件将安装到目录/usr/local/njet
只有通过使用 rpm 或 deb 二进制安装才能使用 systemctl 起停哟！

启动成功截图如下：

在这里插入图片描述

三. 🦁 使用效果

狮子通过官网的配置文件示例，将请求重定向到之前很火的一个动态爱心代码中。

3.1 编辑配置文件

进入配置文件：

cd /usr/local/njet/conf/njet.conf
vim /usr/local/njet/conf/njet.conf

编辑配置文件

worker_processes auto;cluster_name njet;
node_name node1;error_log logs/error.log error;helper ctrl /usr/local/njet/modules/njt_helper_ctrl_module.so /usr/local/njet/conf/njet_ctrl.conf;
helper broker /usr/local/njet/modules/njt_helper_broker_module.so;load_module /usr/local/njet/modules/njt_http_split_clients_2_module.so;
load_module /usr/local/njet/modules/njt_agent_dynlog_module.so;
load_module /usr/local/njet/modules/njt_http_dyn_bwlist_module.so;
load_module /usr/local/njet/modules/njt_dyn_ssl_module.so;
load_module /usr/local/njet/modules/njt_http_vtsc_module.so;
load_module /usr/local/njet/modules/njt_http_location_module.so;
#load_module /usr/local/njet/modules/njt_http_lua_module.so;
#load_module /usr/local/njet/modules/njt_http_modsecurity_module.so;
#load_module /usr/local/njet/modules/njt_http_dyn_modsecurity_module.so;events {worker_connections  1024;
}http {include mime.types;access_log off;vhost_traffic_status_zone;#lua_package_path "$prefix/lualib/lib/?.lua;/usr/local/njet/modules/?.lua;;";#lua_package_cpath "$prefix/lualib/clib/?.so;;";server {#modsecurity on;#modsecurity_rules_file /usr/local/njet/conf/modsec/main.conf;listen       8080;location / {root /opt/html;index index.html}}}

这里我们定义一个 server ,该 server 监听8080端口，将该请求的根目录设置为 /opt/html 下的index.html，当外部访问 192.168.0.99:8080 时,则会直接访问到 /opt/html/index.html 网页。

3.2 编辑 HTML 代码

我们来编辑 /opt/html/index.html 代码，将爱心桃代码放进去：
在这里插入图片描述

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>canvas爱心</title><style>
html, body {height: 100%;padding: 0;margin: 0;background: #000;
}
canvas {position: absolute;width: 100%;height: 100%;
}</style>
</head>
<body><canvas id="pinkboard"></canvas><script>
/** Settings*/
var settings = {particles: {length:   500, // maximum amount of particlesduration:   2, // particle duration in secvelocity: 100, // particle velocity in pixels/sec effect: -0.75, // play with this for a nice effectsize:      30, // particle size in pixels},
};/** RequestAnimationFrame polyfill by Erik M?ller*/
(function(){var b=0;var c=["ms","moz","webkit","o"];for(var a=0;a<c.length&&!window.requestAnimationFrame;++a){window.requestAnimationFrame=window[c[a]+"RequestAnimationFrame"];window.cancelAnimationFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]}if(!window.requestAnimationFrame){window.requestAnimationFrame=function(h,e){var d=new Date().getTime();var f=Math.max(0,16-(d-b));var g=window.setTimeout(function(){h(d+f)},f);b=d+f;return g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTimeout(d)}}}());/** Point class*/
var Point = (function() {function Point(x, y) {this.x = (typeof x !== 'undefined') ? x : 0;this.y = (typeof y !== 'undefined') ? y : 0;}Point.prototype.clone = function() {return new Point(this.x, this.y);};Point.prototype.length = function(length) {if (typeof length == 'undefined')return Math.sqrt(this.x * this.x + this.y * this.y);this.normalize();this.x *= length;this.y *= length;return this;};Point.prototype.normalize = function() {var length = this.length();this.x /= length;this.y /= length;return this;};return Point;
})();/** Particle class*/var Particle = (function() {function Particle() {this.position = new Point();this.velocity = new Point();this.acceleration = new Point();this.age = 0;}Particle.prototype.initialize = function(x, y, dx, dy) {this.position.x = x; this.position.y = y;this.velocity.x = dx;this.velocity.y = dy;this.acceleration.x = dx * settings.particles.effect;this.acceleration.y = dy * settings.particles.effect;this.age = 0;};Particle.prototype.update = function(deltaTime) {this.position.x += this.velocity.x * deltaTime;this.position.y += this.velocity.y * deltaTime;this.velocity.x += this.acceleration.x * deltaTime;this.velocity.y += this.acceleration.y * deltaTime;this.age += deltaTime;};Particle.prototype.draw = function(context, image) {function ease(t) {return (--t) * t * t + 1;}var size = image.width * ease(this.age / settings.particles.duration);context.globalAlpha = 1 - this.age / settings.particles.duration;context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);};return Particle;
})();/** ParticlePool class*/
var ParticlePool = (function() {var particles,firstActive = 0,firstFree   = 0,duration    = settings.particles.duration;function ParticlePool(length) {// create and populate particle poolparticles = new Array(length);for (var i = 0; i < particles.length; i++)particles[i] = new Particle();}ParticlePool.prototype.add = function(x, y, dx, dy) {particles[firstFree].initialize(x, y, dx, dy);// handle circular queuefirstFree++;if (firstFree   == particles.length) firstFree   = 0;if (firstActive == firstFree       ) firstActive++;if (firstActive == particles.length) firstActive = 0;};ParticlePool.prototype.update = function(deltaTime) {var i;// update active particlesif (firstActive < firstFree) {for (i = firstActive; i < firstFree; i++)particles[i].update(deltaTime);}if (firstFree < firstActive) {for (i = firstActive; i < particles.length; i++)particles[i].update(deltaTime);for (i = 0; i < firstFree; i++)particles[i].update(deltaTime);}// remove inactive particleswhile (particles[firstActive].age >= duration && firstActive != firstFree) {firstActive++;if (firstActive == particles.length) firstActive = 0;}};ParticlePool.prototype.draw = function(context, image) {// draw active particlesif (firstActive < firstFree) {for (i = firstActive; i < firstFree; i++)particles[i].draw(context, image);}if (firstFree < firstActive) {for (i = firstActive; i < particles.length; i++)particles[i].draw(context, image);for (i = 0; i < firstFree; i++)particles[i].draw(context, image);}};return ParticlePool;
})();/** Putting it all together*/
(function(canvas) {var context = canvas.getContext('2d'),particles = new ParticlePool(settings.particles.length),particleRate = settings.particles.length / settings.particles.duration, // particles/sectime;// get point on heart with -PI <= t <= PIfunction pointOnHeart(t) {return new Point(160 * Math.pow(Math.sin(t), 3),130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25);}// creating the particle image using a dummy canvasvar image = (function() {var canvas  = document.createElement('canvas'),context = canvas.getContext('2d');canvas.width  = settings.particles.size;canvas.height = settings.particles.size;// helper function to create the pathfunction to(t) {var point = pointOnHeart(t);point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;return point;}// create the pathcontext.beginPath();var t = -Math.PI;var point = to(t);context.moveTo(point.x, point.y);while (t < Math.PI) {t += 0.01; // baby steps!point = to(t);context.lineTo(point.x, point.y);}context.closePath();// create the fillcontext.fillStyle = '#ea80b0';context.fill();// create the imagevar image = new Image();image.src = canvas.toDataURL();return image;})();// render that thing!function render() {// next animation framerequestAnimationFrame(render);// update timevar newTime   = new Date().getTime() / 1000,deltaTime = newTime - (time || newTime);time = newTime;// clear canvascontext.clearRect(0, 0, canvas.width, canvas.height);// create new particlesvar amount = particleRate * deltaTime;for (var i = 0; i < amount; i++) {var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());var dir = pos.clone().length(settings.particles.velocity);particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);}// update and draw particlesparticles.update(deltaTime);particles.draw(context, image);}// handle (re-)sizing of the canvasfunction onResize() {canvas.width  = canvas.clientWidth;canvas.height = canvas.clientHeight;}window.onresize = onResize;// delay rendering bootstrapsetTimeout(function() {onResize();render();}, 10);
})(document.getElementById('pinkboard'));</script></body>
</html>

保存后，重启 njet，访问 192.168.0.99:8080，效果如下：
在这里插入图片描述

四. 🦁 使用感受

在使用上，OpenNjet 很好地继承了 Nginx 服务器，配置文件使用很相似，对于熟悉 Nginx 的开发者来说，学习成本并不会太高，并且 OpenNJet 具备环境感知、安全控制、加速优化等能力，并且可以通过动态加载机制实现不同的产品形态，如API网关、消息代理、入口/出口控制器、边车、负载均衡和WAF等，为企业更好地打造一款稳定、可靠、高效的应用。

在这里插入图片描述