Kotlin, Gradle and AWS SAM

* Kotlin, Gradle 그리고 Serverless Application Model을 이용해서 AWS Lambda, Gateway API를 배포해 봅니다.
* 배포한 API를 사용하는 CLI 앱을 만들어 봅니다.
* 두 프로젝트에서 함께 쓰는 코드를 하나로 합쳐봅니다.

Transcript

1. Kotlin, Gradle 그리고 AWS SAM 허재위(@importre), Riiid! 
   
   ,PUMJO
   /JHIU
   4FPVM
2. About Me ˖ 핺퓒
   !JNQPSUSF ˖ 윊핂슪
   $PGPVOEFS ˖ "OESPJE
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   #BDLFOE ˖ ,PUMJO
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3. 이야기 할 내용 ˖ ,PUMJO
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4. 그리고, Build Script 역시 Kotlin DSL
5. 그림으로 보면 HSFFUJOH 'VODUJPO $-*
6. 개발환경 ˖ +%,
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   BXTTBNDMJ ˖ $POHVSBUJPO
   
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7. 진행 순서  옪헫
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   잚슲믾  4".
   tempalte.yml
   핟컿  옪
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8. 프로젝트 생성
9. 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"
10. 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"
11. 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"
12. 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"
13. 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"
14. 프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts
15. 프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts
16. 프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts
17. 프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts
18. 프로젝트 구조 . ├── build.gradle.kts ├── function │ └── build.gradle.kts ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle.kts
19. API Gateway Handler 만들기
20. 서브 프로젝트 설정 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include(":function")
21. 서브 프로젝트 설정 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include(":function")
22. 핸들러 만들기
    멾뫊쭎
    쫂졂 › http get http: //localhost:3000/greeting HTTP/1.0 200 OK Content-Length: 47 Content-Type: application/json { "message": "Kotlin Night Seoul, Hello!" }
23. 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")) }
24. 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")) }
25. 핸들러 테스트 functions/ .../GreetingHandlerTest.kt class GreetingHandlerTest { private lateinit var app: GreetingHandler @BeforeTest fun setup() { app = GreetingHandler() } @Test fun testSuccessfulResponse() { // ... } }
26. 핸들러 테스트 functions/ .../GreetingHandlerTest.kt class GreetingHandlerTest { private lateinit var app: GreetingHandler @BeforeTest fun setup() { app = GreetingHandler() } @Test fun testSuccessfulResponse() { // ... } }
27. 핸들러 테스트 functions/ .../GreetingHandlerTest.kt class GreetingHandlerTest { private lateinit var app: GreetingHandler @BeforeTest fun setup() { app = GreetingHandler() } @Test fun testSuccessfulResponse() { // ... } }
28. 핸들러 테스트 functions/ .../GreetingHandlerTest.kt class GreetingHandlerTest { private lateinit var app: GreetingHandler @BeforeTest fun setup() { app = GreetingHandler() } @Test fun testSuccessfulResponse() { // ... } }
29. 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 ) } }
30. 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 ) } }
31. 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 ) } }
32. 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 ) } }
33. 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 ) } }
34. 핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map<String, String> = mapOf() private fun body(params: Map<String, String>): String = "" }
35. 핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map<String, String> = mapOf() private fun body(params: Map<String, String>): String = "" }
36. 핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map<String, String> = mapOf() private fun body(params: Map<String, String>): String = "" }
37. 핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map<String, String> = mapOf() private fun body(params: Map<String, String>): String = "" }
38. 핸들러 만들기 functions/ .../GreetingHandler.kt class GreetingHandler : RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> { override fun handleRequest( input: APIGatewayProxyRequestEvent?, context: Context? ): APIGatewayProxyResponseEvent = APIGatewayProxyResponseEvent() .withStatusCode(200) .withHeaders(headers()) .withBody(body(input ?.queryStringParameters ?: emptyMap())) private fun headers(): Map<String, String> = mapOf() private fun body(params: Map<String, String>): String = "" }
39. 핸들러 만들기 functions/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map<String, String>): String = params .getOrDefault("content", "Hello") .let { content -> //language=JSON """ { "message": "Kotlin Night Seoul, ${content.capitalize()}!" } """.trimIndent() }
40. tempalte.yml 작성
41. SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"
42. SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"
43. SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"
44. SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"
45. SAM 템플릿 작성 function/template.yml AWSTemplateFormatVersion: "2010-09-09" Transform: "AWS ::Serverless-2016-10-31" Resources: GreetingFunction: Type: "AWS ::Serverless ::Function" Properties: Handler: "GreetingHandler ::handleRequest" CodeUri: "./build/libs/function-all.jar" Events: IndexApi: Type: "Api" Properties: Path: "/greeting" Method: "get" Runtime: "java8" Outputs: ProdEndpoint: Value: !Sub "https: //${ServerlessRestApi}.execute-api.${AWS ::Region}.amazonaws.com/Prod/"
46. 로컬 테스트
47. 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") }
48. 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") }
49. 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 ... BXTTBNHSBEMFQMVHJO
    JNQPSUSFBXTTBNHSBEMFQMVHJO
50. id("aws.sam") aws-sam-gradle-plugin ˖ TIBEPX
    얺믆핆
    뺂핳 ˖ dependencies읊
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    jar
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    퓒 ˖ $buildDir/lib/${project.name}-all.jar
    칺푷 ˖ 잚핊
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    핂푷삲졂 ˖ 믾쫆헏픊옪
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    jar
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    JNQPSUSFBXTTBNHSBEMFQMVHJO
51. 로컬 테스트 "1*
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    킪핟 › ./gradlew :function:runLocalStartApi
52. 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!" } IUUQJF
    brew install httpie
53. 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!" } IUUQJF
    brew install httpie
54. AWS에 배포
55. AWS에 배포 function/build.gradle.kts sam { template = file("template.yml") bucket = "YOUR_S3_BUCKET_NAME" stack = "YOUR_CLOUDFORMATION_STACK_NAME" } ⚠
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    핂읒
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56. AWS에 배포 function/build.gradle.kts sam { template = file("template.yml") bucket = "YOUR_S3_BUCKET_NAME" stack = "YOUR_CLOUDFORMATION_STACK_NAME" } ⚠
    4
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57. AWS에 배포 $POHVSBUJPO
    
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    핆 › ./gradlew :function:deploySamApp ... ... ... [ { "OutputKey": "ProdEndpoint", "OutputValue": "https: //???.execute-api.ap-northeast-2.amazonaws.com/Prod/" } ]
58. AWS에 배포 $POHVSBUJPO
    
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    'JMFT
    핆 › ./gradlew :function:deploySamApp ... ... ... [ { "OutputKey": "ProdEndpoint", "OutputValue": "https: //???.execute-api.ap-northeast-2.amazonaws.com/Prod/" } ]
59. CLI 앱 만들기
60. CLI 앱 만들기 › # ࢲ࠳ ݽٕ `cli` ࢤࢿ › mkdir cli && touch "$_/build.gradle.kts"
61. CLI 앱 만들기 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include( ":function", ":cli" )
62. CLI 앱 만들기 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include( ":function", ":cli" )
63. 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" }
64. 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" }
65. CLI 앱 만들기 cli/ .../Main.kt data class GreetingData( val message: String ) interface GreetingService { @GET("/greeting") fun greeting( @Query("content") content: String? = null ): Single<Response<GreetingData >> }
66. CLI 앱 만들기 cli/ .../Main.kt data class GreetingData( val message: String ) interface GreetingService { @GET("/greeting") fun greeting( @Query("content") content: String? = null ): Single<Response<GreetingData >> }
67. CLI 앱 만들기 cli/ .../Main.kt data class GreetingData( val message: String ) interface GreetingService { @GET("/greeting") fun greeting( @Query("content") content: String? = null ): Single<Response<GreetingData >> }
68. 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) }
69. 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) }
70. CLI 앱 실행하기 › ./gradlew -q :cli:run Kotlin Night Seoul, Hello!
71. 공통 모듈 만들기
72. Shared 모듈 만들기 # ࢲ࠳ ݽٕ `shared` ࢤࢿ › mkdir shared && touch "$_/build.gradle.kts"
73. Shared 모듈 만들기 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include( ":function", ":cli", ":shared" )
74. Shared 모듈 만들기 settings.gradle.kts rootProject.name = "kotlin-night-seoul" include( ":function", ":cli", ":shared" )
75. 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")) }
76. 공유 코드 shared/ .../GreetingData.kt 핂헒펞
    잚슮
    앦큲읊
    shared
    졶슖옪
    핂솧 data class GreetingData( val message: String )
77. shared 사용 cli/build.gradle.kts dependencies { implementation(project(":shared")) // ... }
78. shared 사용 function/build.gradle.kts dependencies { implementation(project(":shared")) implementation("com.google.code.gson:gson:2.8.5") // ... }
79. 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") }
80. Response 변경 function/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map<String, String>): String = params .getOrDefault("content", "Hello") .let { content -> "Kotlin Night Seoul, ${content.capitalize()}!" } .let { message -> GreetingData(message = message) } .let { data -> Gson().toJson(data) }
81. Response 변경 function/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map<String, String>): String = params .getOrDefault("content", "Hello") .let { content -> "Kotlin Night Seoul, ${content.capitalize()}!" } .let { message -> GreetingData(message = message) } .let { data -> Gson().toJson(data) }
82. Response 변경 function/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map<String, String>): String = params .getOrDefault("content", "Hello") .let { content -> "Kotlin Night Seoul, ${content.capitalize()}!" } .let { message -> GreetingData(message = message) } .let { data -> Gson().toJson(data) }
83. Response 변경 function/ .../GreetingHandler.kt private fun headers() = mapOf( "Content-Type" to "application/json" ) private fun body(params: Map<String, String>): String = params .getOrDefault("content", "Hello") .let { content -> "Kotlin Night Seoul, ${content.capitalize()}!" } .let { message -> GreetingData(message = message) } .let { data -> Gson().toJson(data) }
84. Response 변경 function/ .../GreetingHandlerTest.kt assertEquals( expected = Gson().toJson( GreetingData(message = "Kotlin Night Seoul, Hello!") ), actual = content )
85. 요약
86. 요약 ˖ "84
    -BNCEB
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    핟컿픒
    읾픊옪 ˖ BXTBXTMBNCEBKBWBMJCT ˖ JNQPSUSFBXTTBNHSBEMFQMVHJO ˖ BXTDMJ
    BXTTBNDMJ ˖ 찚슪
    큲잋솒
    읾픊옪 ˖ ,PUMJO
    %4- ˖ 컪쩒퐎
    않핂펆
    슪읊
    뫃퓮믾 ˖ "VUIPSJOH
    .VMUJ1SPKFDU
    #VJMET ˖ "QQMJDBUJPO
    1MVHJO
87. 그리고..
88. 우리는 채용 중!
89. !iiid!
90. !iiid! / get rid of sth /
91. Positions ˖ "OESPJE
    ❤
    ,PUMJO ˖ #BDLFOE
    ❤
    ,PUMJO ˖ "OE
    "*
    J04
    8FC 핞퓮
    퍟킫픊옪
    핂엳컪읊
    쫂뺂훊켆푢 ˋ
    SFDSVJU!SJJJEDP IUUQTSJJJEDPDBSFFS
92. 고맙습니다
93. Q&A
94. !iiid!