[Kotlin Serverless 工作坊] 單元 2 - 簡介 Kotlin Serverless

Apr 23, 20210 likes242 views

在這場工作坊裡，我們使用 Kotlin 以 Serverless 的方式撰寫一個 JSON API 服務，並部署到 GCP Cloud Functions 服務。本章為第二單元，讓學員了解何謂 Serverless 並對 Cloud Functions 服務有基本的認識。詳細步驟可參考講義：http://bit.ly/ktsvless

(Shengyou Fan)
GDG Taichung
2021/04/17
Cloud Functions
Kotlin Serverless API
- Ch.2 Cloud Functions -
Photo by Jean-Philippe Delberghe on Unsplash

—
• KMM
• Kotlin Android App
• Kotlin iOS App

Kotlin
—
Browser
Kotlin/JS
Server
Kotlin/JVM
iOS
Kotlin/Native
Android
Kotlin/JVM

—
•
• Serverless Cloud Functions
• API Cloud Functions
• RSS Aggregator JSON API
•

—
• Serverless
• Cloud Functions
•
• Hello World
•
• GCP

Serverless
—
from Wikipedia
Serverless computing is a cloud computing execution
model in which the cloud provider runs the server,
and dynamically manages the allocation of machine
resources.
Serverless

—
Image source: Serverless Development With Kotlin and Kotless by Vlaadislav Tankov

Google Cloud Platform
—
• GCP
• Cloud Functions Serverless
• Framework
• Cloud Functions GCP Lambda

val invoker by configurations.creating
dependencies {
implementation("...:functions-framework-api:$ver")
invoker("...:java-function-invoker:$ver")
}
—
Cloud Function
• functions-framework-api
• java-function-invoker
Java Invoker

task<JavaExec>("runFunction") {
group = "gcp"
main = "com.google.cloud.functions.invoker.runner.Invoker"
classpath(invoker, sourceSets.main.get().runtimeClasspath)
args(
"--target", project.findProperty("...") ?: "",
"--port", project.findProperty("...") ?: 8080
)
}
Task
—
Gradle Task
$ ./gradlew runFunction

class Handler: HttpFunction {
@Throws(IOException::class)
override fun service(req: HttpRequest, res: HttpResponse) {
// ...
}
}
Handler
—
• Class
• HttpFunction (
functions-framework-api)
• service()
• req res

$class Handler: HttpFunction { @Throws(IOException::class) override fun service(req: HttpRequest, res: HttpResponse) { with(res) { setStatusCode(HttpURLConnection.HTTP_OK) setContentType("plain/text") writer.write("Hello, Cloud Functions”) } } } Plain Text — • HTTP Status Code • Content-Type •$

$ ./gradlew runFunction
-PrunFunction.target=CLASS
-PrunFunction.port=PORT
—
• Gradle Task
• Run Configuration

$ gcloud functions deploy PUBLIC_PATH
--region asia-east2
--runtime java11
--trigger-http
--memory 256MB
--source=build/deploy
--entry-point ENTRY_POINT_CLASS
--allow-unauthenticated
—
• gcloud

在 2021 年的現代迷上寫指令工具（CLI: Command Line）聽起來有點不合常理？但身為開發者的浪漫就是想到可能就做一個試試！身為一個 Kotlin 開發者，如何用我們最愛的程式語言寫指令工具呢？在這場分享裡，我們將會綜覽幾個 CLI 框架及使用方式，並以實作一個 Generator 當範例，示範如何用 Kotlin 寫 CLI 並在各平台部署成原生程式。您也是老派風格的人嗎？歡迎一起來浪漫一下！

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1. (Shengyou Fan) GDG Taichung 2021/04/17 Cloud Functions Kotlin Serverless API - Ch.2 Cloud Functions - Photo by Jean-Philippe Delberghe on Unsplash

2. — • KMM • Kotlin Android App • Kotlin iOS App

3. Kotlin — Browser Kotlin/JS Server Kotlin/JVM iOS Kotlin/Native Android Kotlin/JVM

4. — ?query=param Client Server

5. — • • Serverless Cloud Functions • API Cloud Functions • RSS Aggregator JSON API •

6. — • API Endpoint • RSS • RSS • JSON

7. — • • • ( ) • / ( ) • GCP ( )

8. — • Serverless • Cloud Functions • • Hello World • • GCP

9. — Develop Build/Pack Deploy Scale Up

10. Operation … ! Kotlin

11. Serverless — from Wikipedia Serverless computing is a cloud computing execution model in which the cloud provider runs the server, and dynamically manages the allocation of machine resources. Serverless

12. — Image source: Serverless Development With Kotlin and Kotless by Vlaadislav Tankov

13. Serverless — • • • •

14. Google Cloud Platform — • GCP • Cloud Functions Serverless • Framework • Cloud Functions GCP Lambda

15. Google Cloud Java — Java Kotlin

16. — http://bit.ly/ktsvless

17. —

18. val invoker by configurations.creating dependencies { implementation("...:functions-framework-api:$ver") invoker("...:java-function-invoker:$ver") } — Cloud Function • functions-framework-api • java-function-invoker Java Invoker

19. task<JavaExec>("runFunction") { group = "gcp" main = "com.google.cloud.functions.invoker.runner.Invoker" classpath(invoker, sourceSets.main.get().runtimeClasspath) args( "--target", project.findProperty("...") ?: "", "--port", project.findProperty("...") ?: 8080 ) } Task — Gradle Task $ ./gradlew runFunction

20. class Handler: HttpFunction { @Throws(IOException::class) override fun service(req: HttpRequest, res: HttpResponse) { // ... } } Handler — • Class • HttpFunction ( functions-framework-api) • service() • req res

21. class Handler: HttpFunction { @Throws(IOException::class) override fun service(req: HttpRequest, res: HttpResponse) { with(res) { setStatusCode(HttpURLConnection.HTTP_OK) setContentType("plain/text") writer.write("Hello, Cloud Functions”) } } } Plain Text — • HTTP Status Code • Content-Type •

22. $ ./gradlew runFunction -PrunFunction.target=CLASS -PrunFunction.port=PORT — • Gradle Task • Run Configuration

23. $ gcloud functions deploy PUBLIC_PATH --region asia-east2 --runtime java11 --trigger-http --memory 256MB --source=build/deploy --entry-point ENTRY_POINT_CLASS --allow-unauthenticated — • gcloud

[Kotlin Serverless 工作坊] 單元 2 - 簡介 Kotlin Serverless

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