这是百度百科的答案
《我在一个小公司,我把我们公司前端给架构了》
?, (我当时还看成?《我把我们公司架构师给上了》
?)
BATJ
?),最大的问题在于,觉得自己不是?leader
?,就没有想过如何去提升、优化项目,而是去研究一些花里胡哨的东西,却没有真正使用在项目中。(自然很少会有深度)
前端架构师
SpaceX-API
SpaceX-API
?是什么?
为了阅读的舒适度,我把下面的正文尽量口语化一点
git?clone?https://github.com/r-spacex/SpaceX-API.git?
package.json
?文件)
找到?package.json
?文件的几个关键点:
main
?字段(项目入口)
scripts
?字段(执行命令脚本)
"main":?"server.js",????"scripts":?{?????"test":?"npm?run?lint?&&?npm?run?check-dependencies?&&?jest?--silent?--verbose",?????"start":?"node?server.js",?????"worker":?"node?jobs/worker.js",?????"lint":?"eslint?.",?????"check-dependencies":?"npx?depcheck?--ignores=\"pino-pretty\""???},?
server.js
npm run start
"koa":?"^2.13.0",?????"koa-bodyparser":?"^4.3.0",?????"koa-conditional-get":?"^3.0.0",?????"koa-etag":?"^4.0.0",?????"koa-helmet":?"^6.0.0",?????"koa-pino-logger":?"^3.0.0",?????"koa-router":?"^10.0.0",?????"koa2-cors":?"^2.0.6",?????"lodash":?"^4.17.20",?????"moment-range":?"^4.0.2",?????"moment-timezone":?"^0.5.32",?????"mongoose":?"^5.11.8",?????"mongoose-id":?"^0.1.3",?????"mongoose-paginate-v2":?"^1.3.12",?????"eslint":?"^7.16.0",?????"eslint-config-airbnb-base":?"^14.2.1",?????"eslint-plugin-import":?"^2.22.1",?????"eslint-plugin-jest":?"^24.1.3",?????"eslint-plugin-mongodb":?"^1.0.0",?????"eslint-plugin-no-secrets":?"^0.6.8",?????"eslint-plugin-security":?"^1.4.0",?????"jest":?"^26.6.3",?????"pino-pretty":?"^4.3.0"?
都是一些通用主流库: 主要是koa框架,以及一些koa的一些中间件,monggose(连接使用mongoDB),eslint(代码质量检查)
这里强调一点,如果你的代码需要两人及以上维护,我就强烈建议你不要使用任何黑魔法,以及不使用非主流的库,除非你编写核心底层逻辑时候非用不可(这个时候应该只有你维护)
项目目录
REST API,
?严格分层
"dependencies":?{?????"blake3":?"^2.1.4",?????"cheerio":?"^1.0.0-rc.3",?????"cron":?"^1.8.2",?????"fuzzball":?"^1.3.0",?????"got":?"^11.8.1",?????"ioredis":?"^4.19.4",?????"koa":?"^2.13.0",?????"koa-bodyparser":?"^4.3.0",?????"koa-conditional-get":?"^3.0.0",?????"koa-etag":?"^4.0.0",?????"koa-helmet":?"^6.0.0",?????"koa-pino-logger":?"^3.0.0",?????"koa-router":?"^10.0.0",?????"koa2-cors":?"^2.0.6",?????"lodash":?"^4.17.20",?????"moment-range":?"^4.0.2",?????"moment-timezone":?"^0.5.32",?????"mongoose":?"^5.11.8",?????"mongoose-id":?"^0.1.3",?????"mongoose-paginate-v2":?"^1.3.12",?????"pino":?"^6.8.0",?????"tle.js":?"^4.2.8",?????"tough-cookie":?"^4.0.0"???},???"devDependencies":?{?????"eslint":?"^7.16.0",?????"eslint-config-airbnb-base":?"^14.2.1",?????"eslint-plugin-import":?"^2.22.1",?????"eslint-plugin-jest":?"^24.1.3",?????"eslint-plugin-mongodb":?"^1.0.0",?????"eslint-plugin-no-secrets":?"^0.6.8",?????"eslint-plugin-security":?"^1.4.0",?????"jest":?"^26.6.3",?????"pino-pretty":?"^4.3.0"???},?
项目目录划分
server.js
?开始
const?http?=?require('http');?const?mongoose?=?require('mongoose');?const?{?logger?}?=?require('./middleware/logger');?const?app?=?require('./app');??const?PORT?=?process.env.PORT?||?6673;?const?SERVER?=?http.createServer(app.callback());??//?Gracefully?close?Mongo?connection?const?gracefulShutdown?=?()?=>?{???mongoose.connection.close(false,?()?=>?{?????logger.info('Mongo?closed');?????SERVER.close(()?=>?{???????logger.info('Shutting?down...');???????process.exit();?????});???});?};??//?Server?start?SERVER.listen(PORT,?'0.0.0.0',?()?=>?{???logger.info(`Running?on?port:?${PORT}`);????//?Handle?kill?commands???process.on('SIGTERM',?gracefulShutdown);????//?Prevent?dirty?exit?on?code-fault?crashes:???process.on('uncaughtException',?gracefulShutdown);????//?Prevent?promise?rejection?exits???process.on('unhandledRejection',?gracefulShutdown);?});?
SERVER.listen
?的host参数也会传入,这里是为了避免产生不必要的麻烦。至于这个麻烦,我这就不解释了(一定要有能看到的默认值,而不是去靠猜)
process
?进程退出,防止出现僵死线程、端口占用等(因为node部署时候可能会用pm2等方式,在 Worker 线程中,process.exit()将停止当前线程而不是当前进程)
koa
?提供基础服务
monggose
?负责连接?mongoDB
?数据库
const?conditional?=?require('koa-conditional-get');?const?etag?=?require('koa-etag');?const?cors?=?require('koa2-cors');?const?helmet?=?require('koa-helmet');?const?Koa?=?require('koa');?const?bodyParser?=?require('koa-bodyparser');?const?mongoose?=?require('mongoose');?const?{?requestLogger,?logger?}?=?require('./middleware/logger');?const?{?responseTime,?errors?}?=?require('./middleware');?const?{?v4?}?=?require('./services');??const?app?=?new?Koa();??mongoose.connect(process.env.SPACEX_MONGO,?{???useFindAndModify:?false,???useNewUrlParser:?true,???useUnifiedTopology:?true,???useCreateIndex:?true,?});??const?db?=?mongoose.connection;??db.on('error',?(err)?=>?{???logger.error(err);?});?db.once('connected',?()?=>?{???logger.info('Mongo?connected');???app.emit('ready');?});?db.on('reconnected',?()?=>?{???logger.info('Mongo?re-connected');?});?db.on('disconnected',?()?=>?{???logger.info('Mongo?disconnected');?});??//?disable?console.errors?for?pino?app.silent?=?true;??//?Error?handler?app.use(errors);??app.use(conditional());??app.use(etag());??app.use(bodyParser());??//?HTTP?header?security?app.use(helmet());??//?Enable?CORS?for?all?routes?app.use(cors({???origin:?'*',???allowMethods:?['GET',?'POST',?'PATCH',?'DELETE'],???allowHeaders:?['Content-Type',?'Accept'],???exposeHeaders:?['spacex-api-cache',?'spacex-api-response-time'],?}));??//?Set?header?with?API?response?time?app.use(responseTime);??//?Request?logging?app.use(requestLogger);??//?V4?routes?app.use(v4.routes());??module.exports?=?app;?
//组件挂载?componentDidmount(){??}?//组件需要更新时?shouldComponentUpdate(){??}?//组件将要卸载?componentWillUnmount(){??}?...?render(){}?
const?Router?=?require('koa-router');?const?admin?=?require('./admin/routes');?const?capsules?=?require('./capsules/routes');?const?cores?=?require('./cores/routes');?const?crew?=?require('./crew/routes');?const?dragons?=?require('./dragons/routes');?const?landpads?=?require('./landpads/routes');?const?launches?=?require('./launches/routes');?const?launchpads?=?require('./launchpads/routes');?const?payloads?=?require('./payloads/routes');?const?rockets?=?require('./rockets/routes');?const?ships?=?require('./ships/routes');?const?users?=?require('./users/routes');?const?company?=?require('./company/routes');?const?roadster?=?require('./roadster/routes');?const?starlink?=?require('./starlink/routes');?const?history?=?require('./history/routes');?const?fairings?=?require('./fairings/routes');??const?v4?=?new?Router({???prefix:?'/v4',?});??v4.use(admin.routes());?v4.use(capsules.routes());?v4.use(cores.routes());?v4.use(crew.routes());?v4.use(dragons.routes());?v4.use(landpads.routes());?v4.use(launches.routes());?v4.use(launchpads.routes());?v4.use(payloads.routes());?v4.use(rockets.routes());?v4.use(ships.routes());?v4.use(users.routes());?v4.use(company.routes());?v4.use(roadster.routes());?v4.use(starlink.routes());?v4.use(history.routes());?v4.use(fairings.routes());??module.exports?=?v4;?
admin
?模块
const?Router?=?require('koa-router');?const?{?auth,?authz,?cache?}?=?require('../../../middleware');??const?router?=?new?Router({???prefix:?'/admin',?});??//?Clear?redis?cache?router.delete('/cache',?auth,?authz('cache:clear'),?async?(ctx)?=>?{???try?{?????await?cache.redis.flushall();?????ctx.status?=?200;???}?catch?(error)?{?????ctx.throw(400,?error.message);???}?});??//?Healthcheck?router.get('/health',?async?(ctx)?=>?{???ctx.status?=?200;?});??module.exports?=?router;?
401
?。但是登录后,你只能做你权限内的事情,例如你只是一个打工人,你说你要关闭这个公司,那么对不起,你的状态码此时应该是?403
auth
?中间件判断你是否有登录
/**??*?Authentication?middleware??*/?module.exports?=?async?(ctx,?next)?=>?{???const?key?=?ctx.request.headers['spacex-key'];???if?(key)?{?????const?user?=?await?db.collection('users').findOne({?key?});?????if?(user?.key?===?key)?{???????ctx.state.roles?=?user.roles;???????await?next();???????return;?????}???}???ctx.status?=?401;???ctx.body?=?'https://youtu.be/RfiQYRn7fBg';?};?
authz
?。?(所以redux的中间件源码是多么重要。它可以说贯穿了我们整个前端生涯,我以前些过它的分析,有兴趣的可以翻一翻公众号)
/**??*?Authorization?middleware??*??*?@param???{String}???role???Role?for?protected?route??*?@returns?{void}??*/?module.exports?=?(role)?=>?async?(ctx,?next)?=>?{???const?{?roles?}?=?ctx.state;???const?allowed?=?roles.includes(role);???if?(allowed)?{?????await?next();?????return;???}???ctx.status?=?403;?};?
//?Clear?redis?cache?router.delete('/cache',?auth,?authz('cache:clear'),?async?(ctx)?=>?{???try?{?????await?cache.redis.flushall();?????ctx.status?=?200;???}?catch?(error)?{?????ctx.throw(400,?error.message);???}?});?
error
?中间件处理
/**??*?Error?handler?middleware??*??*?@param???{Object}????ctx???????Koa?context??*?@param???{function}??next??????Koa?next?function??*?@returns?{void}??*/?module.exports?=?async?(ctx,?next)?=>?{???try?{?????await?next();???}?catch?(err)?{?????if?(err?.kind?===?'ObjectId')?{???????err.status?=?404;?????}?else?{???????ctx.status?=?err.status?||?500;???????ctx.body?=?err.message;?????}???}?};?
server
?层内部出现异常,只要抛出,就会被?error
?中间件处理,直接返回状态码和错误信息. 如果没有传入状态码,那么默认是500(所以我之前说过,代码要稳定,一定要有显示的指定默认值,要关注代码异常的逻辑,例如前端setLoading,请求失败也要取消loading,不然用户就没法重试了,有可能这一瞬间只是用户网络出错呢)
补一张koa洋葱圈的图
//?Get?one?history?event?router.get('/:id',?cache(300),?async?(ctx)?=>?{???const?result?=?await?History.findById(ctx.params.id);???if?(!result)?{?????ctx.throw(404);???}???ctx.status?=?200;???ctx.body?=?result;?});??//?Query?history?events?router.post('/query',?cache(300),?async?(ctx)?=>?{???const?{?query?=?{},?options?=?{}?}?=?ctx.request.body;???try?{?????const?result?=?await?History.paginate(query,?options);?????ctx.status?=?200;?????ctx.body?=?result;???}?catch?(error)?{?????ctx.throw(400,?error.message);???}?});?
通过这个项目,我们能学到什么
C++
?)
再者是要多阅读优秀的开源项目源码,不用太多,但是一定要精
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