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    --- tags: jsdc2021 --- # #Session 3 從前端邁向全端 - 前端開發者不該錯過的 Serverless 技術 {%hackmd 2YoCBdBPTjmHXDr9lEpWuQ %} > 從這開始 > 可以直接打字做共筆囉 :point_down: Kyle Mo 莫力全 ## 開場詞 - 主要改變後端生態 - 前端也有好處 ![](https://i.imgur.com/rG675DQ.png) ## Agenda ![](https://i.imgur.com/h1rgq82.png) ## 前端開發模式的演進 ![](https://i.imgur.com/XXXdYsg.png) ### 模板渲染的動態頁面 - 早期:前端表單送後端 - 後端語言 + 模板語言 - 網頁工程化 ### AJAX 帶來的前後端分離 [1.0] - 前端 - 使用者體驗 - 後端 - 商業邏輯 - 資料串接和溝通 - "前端工程師" 的誕生 ### Node.js 帶來的前端工程化 [2.0] - Node.js / NPM - 加速網站部署流程 - 前端開發邁向工程化、標準化、規範化、模組化 - ### 基於 Node.js 的全端開發 [2.0] - Browser -> Server! - 全端開發 ### 大前端時代 [2.5] - 供通點 - 跨時代的技術所引發 - 不會說 3.0 而是 2.5 - React.js / Vue.js / Angular ... - 前端跨越到後端的開發 - 跨平台 - React Native - Electron - Flutter ### 下一步 - Serverless (3.0 or not, maybe?) ## 前端往全端的困難 ![](https://i.imgur.com/KtyGNy2.png) - 通常自稱 Full Stack 都是廢物 (此為業界網路流傳) <!-- 贊同 :+1: --> <!-- 我就是廢物 --> <!-- 我也碰全端,但我不會說自己全端 orz --> - ![](https://i.imgur.com/IXkBxcj.png) - 大部分的 web 開發者還是偏向其中一端 - ![](https://i.imgur.com/zUHS3Ei.png) ## 前端為何需要後端技能樹 - 上文不代表前端不要後端技能 - Server-Side Rendering - ![](https://i.imgur.com/0uh9zLj.png) - Next.js / `getServerSideProps` - ![](https://i.imgur.com/LXkUJ4a.png) - 不是很好的寫法 - 只是示範 - BFF (Backend For Frontend) - ![](https://i.imgur.com/U2Gwnoq.png) - Direct CTM Communication - ![](https://i.imgur.com/OYAZ1BF.png) - 用戶端會跟服務高 couple - Round Trips (network) - delay - Security - API Public - DRY - 通用、重複的邏輯 - 抽成一層 - API Gateway Pattern - ![](https://i.imgur.com/APVJF7E.png) - Reverse Proxy - Requests Aggregation - Decouple - Extract Common Logics - ![](https://i.imgur.com/Jk5cpwL.png) - API Pattern 可能產生問題 - 每個平台需要的資料不一樣 - ex. 手機不需要大量資料 - 架構造成混亂 - BFF 就是 solution - One Backend Per User Experience ### Obstacles ![](https://i.imgur.com/GyGHOCg.png) - 有前端以外的團隊參與維護 - 有很多地方需要考慮 - 前端適合商業邏輯、API - 其他部分交給 Serverless ## Serverless ![](https://i.imgur.com/Dr2zVBx.png) - 前端專注上層開發 - Serverless 管理底層內容 - FaaS X BaaS - Platforms - AWS Lambda - Google CF - Google Cloud Run - Azure Functions - Firebase - Message Queue - Cloud Storage - Logging - Stateless - 不適合在 containers 放資料 - 無法保證 container 會續存 - 需要外部服務 ![](https://i.imgur.com/WEqcGAE.png) ### 好處與壞處 ### Adv - 專注商業邏輯 - Pay as you go - ![](https://i.imgur.com/MIvgnTz.png) - Auto scaling - 快速部署 - #### D.Adv - 與 Cloud Provider 過於耦合 - 冷啟動與 Latency <!-- 用過 CF, Cloud Run 有感--> - 不適合長期執行與高並行作業 - Serverless 服務有限制 - ![](https://i.imgur.com/KL1aQFh.png) - Serverless 貴貴 ### 服務提供商 ![](https://i.imgur.com/FOyUVZy.png) - 補充 - Vercel - Bingo - Firebase Hosting ### Serverless 的願景 ![](https://i.imgur.com/W7xuQ0P.png) ![](https://i.imgur.com/6NFeYzY.png) - Backend Engineer 不會被取代 - 不是每個狀況適合 Serverless ![](https://i.imgur.com/SgRqtzM.png) - 前端都能做了! ## 總結 ![](https://i.imgur.com/4NmFydF.png) 從前端走向全端

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