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Kotlin, Gradle 그리고 AWS SAM 허재위(@importre), Riiid! ,PUMJO/JHIU4FPVM

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About Me ˖ 핺퓒!JNQPSUSF ˖ 윊핂슪$PGPVOEFS ˖ "OESPJE <->#BDLFOE ˖ ,PUMJO,PSFB

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이야기 할 내용 ˖ ,PUMJO (SBEMF믆읺몮4FSWFSMFTT"QQMJDBUJPO.PEFM4".픒핂푷 컪"84-BNCEB (BUFXBZ"1*읊짾쫓삖삲 ˖ 짾"1*읊칺푷쁢$-*팿픒잚슲펂쫓삖삲 ˖ 숞옪헫펞컪벦튾쁢슪읊빦옪쫓삖삲 펂썲뮪졶펞컪슮핞3&45짝8FC4PDLFU"1*읊캫컿 멚킪 퓮힎뫎읺 졶삖잏짝쫂쿦핖멚훊쁢"84컪찒큲 컪쩒읊뫎읺힎팘몮슪읊킲쿦핖멚훊쁢컪찒큲 푢킪펞잚킲  4"."84캏펞컪컪쩒읺큲팿픒잚슲믾퓒칺푷쿦핖쁢폲콚큲엖핒풚

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그리고, Build Script 역시 Kotlin DSL

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그림으로 보면 HSFFUJOH 'VODUJPO $-*

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개발환경 ˖ +%, ˖ (SBEMF9 ˖ %PDLFS ˖ "84 ˖ $-*BQQT BXTDMJ BXTTBNDMJ ˖ $POHVSBUJPO$SFEFOUJBM'JMFT

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진행 순서  옪헫캫컿  "1*(BUFXBZ)BOEMFS잚슲믾  4".tempalte.yml핟컿  옪큲  "84펞짾  묺"1*읊핂푷쁢$-*팿잚슲믾 뫃슪뫃퓮

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프로젝트 생성

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프로젝트 생성 › # ೐۽ં౟ ٣۩షܻ ࢤࢿ ߂ ੉ز › mkdir kotlin-night-seoul && cd $_ › # Gradle ೐۽ં౟ ୡӝച › gradle init --type basic --dsl kotlin Project name (default: kotlin-night-seoul): › # ࢲ࠳ ݽٕ `function` ࢤࢿ › mkdir function && touch "$_/build.gradle.kts"

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프로젝트 생성 › # ೐۽ં౟ ٣۩షܻ ࢤࢿ ߂ ੉ز › mkdir kotlin-night-seoul && cd $_ › # Gradle ೐۽ં౟ ୡӝച › gradle init --type basic --dsl kotlin Project name (default: kotlin-night-seoul): › # ࢲ࠳ ݽٕ `function` ࢤࢿ › mkdir function && touch "$_/build.gradle.kts"

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프로젝트 생성 › # ೐۽ં౟ ٣۩షܻ ࢤࢿ ߂ ੉ز › mkdir kotlin-night-seoul && cd $_ › # Gradle ೐۽ં౟ ୡӝച › gradle init --type basic --dsl kotlin Project name (default: kotlin-night-seoul): › # ࢲ࠳ ݽٕ `function` ࢤࢿ › mkdir function && touch "$_/build.gradle.kts"

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프로젝트 생성 › # ೐۽ં౟ ٣۩షܻ ࢤࢿ ߂ ੉ز › mkdir kotlin-night-seoul && cd $_ › # Gradle ೐۽ં౟ ୡӝച › gradle init --type basic --dsl kotlin Project name (default: kotlin-night-seoul): › # ࢲ࠳ ݽٕ `function` ࢤࢿ › mkdir function && touch "$_/build.gradle.kts"

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프로젝트 생성 › # ೐۽ં౟ ٣۩షܻ ࢤࢿ ߂ ੉ز › mkdir kotlin-night-seoul && cd $_ › # Gradle ೐۽ં౟ ୡӝച › gradle init --type basic --dsl kotlin Project name (default: kotlin-night-seoul): › # ࢲ࠳ ݽٕ `function` ࢤࢿ › mkdir function && touch "$_/build.gradle.kts"

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프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts

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프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts

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프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts

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프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts

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프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts

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API Gateway Handler 만들기

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서브 프로젝트 설정 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include(":function")

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서브 프로젝트 설정 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include(":function")

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핸들러 만들기 멾뫊쭎쫂졂 › http get http: //localhost:3000/greeting HTTP/1.0 200 OK Content-Length: 47 Content-Type: application/json { "message": "Kotlin Night Seoul, Hello!" }

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핸들러 만들기 functions/build.gradle.kts plugins { kotlin("jvm") version "1.3.21" } repositories { jcenter() } dependencies { implementation(kotlin("stdlib-jdk8")) implementation("com.amazonaws:aws-lambda-java-core:1.2.0") implementation("com.amazonaws:aws-lambda-java-events:2.2.5") implementation("com.amazonaws:aws-lambda-java-log4j2:1.0.0") testImplementation(kotlin("test-junit")) }

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핸들러 만들기 functions/build.gradle.kts plugins { kotlin("jvm") version "1.3.21" } repositories { jcenter() } dependencies { implementation(kotlin("stdlib-jdk8")) implementation("com.amazonaws:aws-lambda-java-core:1.2.0") implementation("com.amazonaws:aws-lambda-java-events:2.2.5") implementation("com.amazonaws:aws-lambda-java-log4j2:1.0.0") testImplementation(kotlin("test-junit")) }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt class GreetingHandlerTest { private lateinit var app: GreetingHandler @BeforeTest fun setup() { app = GreetingHandler() } @Test fun testSuccessfulResponse() { // ... } }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt class GreetingHandlerTest { private lateinit var app: GreetingHandler @BeforeTest fun setup() { app = GreetingHandler() } @Test fun testSuccessfulResponse() { // ... } }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt class GreetingHandlerTest { private lateinit var app: GreetingHandler @BeforeTest fun setup() { app = GreetingHandler() } @Test fun testSuccessfulResponse() { // ... } }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt class GreetingHandlerTest { private lateinit var app: GreetingHandler @BeforeTest fun setup() { app = GreetingHandler() } @Test fun testSuccessfulResponse() { // ... } }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt @Test fun testSuccessfulResponse() { val result = app.handleRequest(null, null) assertEquals(result.statusCode, 200) assertEquals(result.headers["Content-Type"], "application/json") result.body ?.let { content -> //language=JSON assertEquals( expected = """ { "message": "Kotlin Night Seoul, Hello!" } """.trimIndent(), actual = content ) } }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt @Test fun testSuccessfulResponse() { val result = app.handleRequest(null, null) assertEquals(result.statusCode, 200) assertEquals(result.headers["Content-Type"], "application/json") result.body ?.let { content -> //language=JSON assertEquals( expected = """ { "message": "Kotlin Night Seoul, Hello!" } """.trimIndent(), actual = content ) } }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt @Test fun testSuccessfulResponse() { val result = app.handleRequest(null, null) assertEquals(result.statusCode, 200) assertEquals(result.headers["Content-Type"], "application/json") result.body ?.let { content -> //language=JSON assertEquals( expected = """ { "message": "Kotlin Night Seoul, Hello!" } """.trimIndent(), actual = content ) } }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt @Test fun testSuccessfulResponse() { val result = app.handleRequest(null, null) assertEquals(result.statusCode, 200) assertEquals(result.headers["Content-Type"], "application/json") result.body ?.let { content -> //language=JSON assertEquals( expected = """ { "message": "Kotlin Night Seoul, Hello!" } """.trimIndent(), actual = content ) } }

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핸들러 테스트 functions/ .../GreetingHandlerTest.kt @Test fun testSuccessfulResponse() { val result = app.handleRequest(null, null) assertEquals(result.statusCode, 200) assertEquals(result.headers["Content-Type"], "application/json") result.body ?.let { content -> //language=JSON assertEquals( expected = """ { "message": "Kotlin Night Seoul, Hello!" } """.trimIndent(), actual = content ) } }

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핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map = mapOf() private fun body(params: Map): String = "" }

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핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map = mapOf() private fun body(params: Map): String = "" }

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핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map = mapOf() private fun body(params: Map): String = "" }

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핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map = mapOf() private fun body(params: Map): String = "" }

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핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map = mapOf() private fun body(params: Map): String = "" }

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핸들러 만들기 functions/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map): String = params .getOrDefault("content", "Hello") .let { content -> //language=JSON """ { "message": "Kotlin Night Seoul, ${content.capitalize()}!" } """.trimIndent() }

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tempalte.yml 작성

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SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"

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SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"

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SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"

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SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"

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SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"

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로컬 테스트

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로컬 테스트 function/build.gradle.kts plugins { kotlin("jvm") version "1.3.21" id("aws.sam") version "0.1.0" } repositories { jcenter() } dependencies { implementation(kotlin("stdlib-jdk8")) implementation("com.amazonaws:aws-lambda-java-core:1.2.0") implementation("com.amazonaws:aws-lambda-java-events:2.2.5") implementation("com.amazonaws:aws-lambda-java-log4j2:1.0.0") testImplementation(kotlin("test-junit")) } sam { template = file("template.yml") }

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로컬 테스트 function/build.gradle.kts plugins { kotlin("jvm") version "1.3.21" id("aws.sam") version "0.1.0" } repositories { jcenter() } dependencies { implementation(kotlin("stdlib-jdk8")) implementation("com.amazonaws:aws-lambda-java-core:1.2.0") implementation("com.amazonaws:aws-lambda-java-events:2.2.5") implementation("com.amazonaws:aws-lambda-java-log4j2:1.0.0") testImplementation(kotlin("test-junit")) } sam { template = file("template.yml") }

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id("aws.sam") aws-sam-gradle-plugin ˖ 5BTLT ˖ JOTUBMM"XT4BN › pip install awscli aws-sam-cli ˖ NBLF#VDLFU › aws s3 mb s3: // ... ˖ QBDLBHF4BN"QQ › sam package ... ˖ SVO-PDBM4UBSU"QJ › sam local start-api ... ˖ EFQMPZ4BN"QQ › sam deploy ... BXTTBNHSBEMFQMVHJOJNQPSUSFBXTTBNHSBEMFQMVHJO

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id("aws.sam") aws-sam-gradle-plugin ˖ TIBEPX얺믆핆뺂핳 ˖ dependencies읊졶숞jar핊픒T펞폺읺믾퓒 ˖ $buildDir/lib/${project.name}-all.jar칺푷 ˖ 잚핊"84-BNCEB-BZFST읊핂푷삲졂 ˖ 믾쫆헏픊옪캫컿쇦쁢jar핊칺푷 BXTTBNHSBEMFQMVHJOJNQPSUSFBXTTBNHSBEMFQMVHJO

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로컬 테스트 "1*컪쩒킪핟 › ./gradlew :function:runLocalStartApi

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로컬 테스트 httpie › http get http: //localhost:3000/greeting HTTP/1.0 200 OK Content-Length: 47 Content-Type: application/json { "message": "Kotlin Night Seoul, Hello!" } IUUQJFbrew install httpie

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로컬 테스트 httpie › http get http: //localhost:3000/greeting\?content\=2019 HTTP/1.0 200 OK Content-Length: 46 Content-Type: application/json { "message": "Kotlin Night Seoul, 2019!" } IUUQJFbrew install httpie

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AWS에 배포

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AWS에 배포 function/build.gradle.kts sam { template = file("template.yml") bucket = "YOUR_S3_BUCKET_NAME" stack = "YOUR_CLOUDFORMATION_STACK_NAME" } ⚠ 4#VFDLFU $MPVE'PSNBUJPO4UBDL핂읒뮪훊픦

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AWS에 배포 function/build.gradle.kts sam { template = file("template.yml") bucket = "YOUR_S3_BUCKET_NAME" stack = "YOUR_CLOUDFORMATION_STACK_NAME" } ⚠ 4#VFDLFU $MPVE'PSNBUJPO4UBDL핂읒뮪훊픦

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AWS에 배포 $POHVSBUJPO$SFEFOUJBM'JMFT핆 › ./gradlew :function:deploySamApp ... ... ... [ { "OutputKey": "ProdEndpoint", "OutputValue": "https: //???.execute-api.ap-northeast-2.amazonaws.com/Prod/" } ]

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AWS에 배포 $POHVSBUJPO$SFEFOUJBM'JMFT핆 › ./gradlew :function:deploySamApp ... ... ... [ { "OutputKey": "ProdEndpoint", "OutputValue": "https: //???.execute-api.ap-northeast-2.amazonaws.com/Prod/" } ]

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CLI 앱 만들기

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CLI 앱 만들기 › # ࢲ࠳ ݽٕ `cli` ࢤࢿ › mkdir cli && touch "$_/build.gradle.kts"

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CLI 앱 만들기 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include( ":function", ":cli" )

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CLI 앱 만들기 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include( ":function", ":cli" )

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CLI 앱 만들기 cli/build.gradle.kts plugins { kotlin("jvm") version "1.3.21" application } repositories { jcenter() } dependencies { implementation(kotlin("stdlib-jdk8")) implementation("com.squareup.retrofit2:retrofit:2.5.0") implementation("com.squareup.retrofit2:converter-gson:2.5.0") implementation("com.squareup.retrofit2:adapter-rxjava2:2.5.0") testImplementation(kotlin("test-junit")) } application { mainClassName = "MainKt" }

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CLI 앱 만들기 cli/build.gradle.kts plugins { kotlin("jvm") version "1.3.21" application } repositories { jcenter() } dependencies { implementation(kotlin("stdlib-jdk8")) implementation("com.squareup.retrofit2:retrofit:2.5.0") implementation("com.squareup.retrofit2:converter-gson:2.5.0") implementation("com.squareup.retrofit2:adapter-rxjava2:2.5.0") testImplementation(kotlin("test-junit")) } application { mainClassName = "MainKt" }

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CLI 앱 만들기 cli/ .../Main.kt data class GreetingData( val message: String ) interface GreetingService { @GET("/greeting") fun greeting( @Query("content") content: String? = null ): Single> }

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CLI 앱 만들기 cli/ .../Main.kt data class GreetingData( val message: String ) interface GreetingService { @GET("/greeting") fun greeting( @Query("content") content: String? = null ): Single> }

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CLI 앱 만들기 cli/ .../Main.kt data class GreetingData( val message: String ) interface GreetingService { @GET("/greeting") fun greeting( @Query("content") content: String? = null ): Single> }

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CLI 앱 만들기 cli/ .../Main.kt private val service = Builder() .client(OkHttpClient()) .baseUrl("http: //127.0.0.1:3000") .addConverterFactory(GsonConverterFactory.create()) .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .build() .create(GreetingService ::class.java) fun main() { service.greeting() .map { it.body() ?.message ?: it.errorBody() ?: "???" } .subscribe( ::println, Throwable ::printStackTrace) }

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CLI 앱 만들기 cli/ .../Main.kt private val service = Builder() .client(OkHttpClient()) .baseUrl("http: //127.0.0.1:3000") .addConverterFactory(GsonConverterFactory.create()) .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .build() .create(GreetingService ::class.java) fun main() { service.greeting() .map { it.body() ?.message ?: it.errorBody() ?: "???" } .subscribe( ::println, Throwable ::printStackTrace) }

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CLI 앱 실행하기 › ./gradlew -q :cli:run Kotlin Night Seoul, Hello!

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공통 모듈 만들기

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Shared 모듈 만들기 # ࢲ࠳ ݽٕ `shared` ࢤࢿ › mkdir shared && touch "$_/build.gradle.kts"

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Shared 모듈 만들기 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include( ":function", ":cli", ":shared" )

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Shared 모듈 만들기 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include( ":function", ":cli", ":shared" )

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Shared 모듈 만들기 shared/build.gradle.kts plugins { kotlin("jvm") version "1.3.21" } repositories { jcenter() } dependencies { implementation(kotlin("stdlib-jdk8")) testImplementation(kotlin("test-junit")) }

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공유 코드 shared/ .../GreetingData.kt 핂헒펞잚슮앦큲읊shared졶슖옪핂솧 data class GreetingData( val message: String )

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shared 사용 cli/build.gradle.kts dependencies { implementation(project(":shared")) // ... }

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shared 사용 function/build.gradle.kts dependencies { implementation(project(":shared")) implementation("com.google.code.gson:gson:2.8.5") // ... }

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JVM Kotlin Plugin 젎옪헫 // build.gradle.kts plugins { kotlin("jvm") version "1.3.21" apply false } // shared/build.gradle.kts // function/build.gradle.kts // cli/build.gradle.kts plugins { kotlin("jvm") }

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Response 변경 function/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map): String = params .getOrDefault("content", "Hello") .let { content -> "Kotlin Night Seoul, ${content.capitalize()}!" } .let { message -> GreetingData(message = message) } .let { data -> Gson().toJson(data) }

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Response 변경 function/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map): String = params .getOrDefault("content", "Hello") .let { content -> "Kotlin Night Seoul, ${content.capitalize()}!" } .let { message -> GreetingData(message = message) } .let { data -> Gson().toJson(data) }

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Response 변경 function/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map): String = params .getOrDefault("content", "Hello") .let { content -> "Kotlin Night Seoul, ${content.capitalize()}!" } .let { message -> GreetingData(message = message) } .let { data -> Gson().toJson(data) }

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Response 변경 function/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map): String = params .getOrDefault("content", "Hello") .let { content -> "Kotlin Night Seoul, ${content.capitalize()}!" } .let { message -> GreetingData(message = message) } .let { data -> Gson().toJson(data) }

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Response 변경 function/ .../GreetingHandlerTest.kt assertEquals( expected = Gson().toJson( GreetingData(message = "Kotlin Night Seoul, Hello!") ), actual = content )

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요약

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요약 ˖ "84-BNCEB "1*(BUFXBZ핟컿픒읾픊옪 ˖ BXTBXTMBNCEBKBWBMJCT ˖ JNQPSUSFBXTTBNHSBEMFQMVHJO ˖ BXTDMJ BXTTBNDMJ ˖ 찚슪큲잋솒읾픊옪 ˖ ,PUMJO%4- ˖ 컪쩒퐎않핂펆슪읊뫃퓮믾 ˖ "VUIPSJOH.VMUJ1SPKFDU#VJMET ˖ "QQMJDBUJPO1MVHJO

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그리고..

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우리는 채용 중!

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!iiid!

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!iiid! / get rid of sth /

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Positions ˖ "OESPJE ❤ ,PUMJO ˖ #BDLFOE ❤ ,PUMJO ˖ "OE"* J04 8FC 핞퓮퍟킫픊옪핂엳컪읊쫂뺂훊켆푢 ˋSFDSVJU!SJJJEDP IUUQTSJJJEDPDBSFFS

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고맙습니다

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Q&A

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!iiid!