IBM DeveloperConnect 2017 에서 발표했던 자료입니다. Spring Cloud Function Project 소개. Serverless 소개. Spring Cloud Function 기반으로 구현된 함수 IBM Cloud Function( Openwhisk )에서 실행하기.

1. © 2017 IBM Corporation
홍상표
KSUG(Korea Spring User Group) 일꾼
Backend Developer in SK Planet
Spring Cloud Function
Serverless Framework

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Spring Cloud Function
Spring Cloud Function
– http://cloud.spring.io/spring-cloud-function
– 1.0.0.M1 Release
– https://spring.io/blog/2017/07/05/introducing-spring-cloud-function
– https://springoneplatform.io/sessions/serverless-spring

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Spring Cloud Function

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Goals
Spring Cloud Function
– Promote the implementation of business logic via functions.
– Decouple the development lifecycle of business logic from any specific runtime
target so that the same code can run as a web endpoint, a stream processor, or a
task.
– Support a uniform programming model across serverless providers, as well as the
ability to run standalone (locally or in a PaaS).
– Enable Spring Boot features (auto-configuration, dependency injection, metrics) on
serverless providers.

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영문자를 입력받아 대문자를 반환하는 함수
Spring Cloud Function
public class Application {
public Function<String, String> uppercase() {
return new Function<String, String>(){
@Override
public String apply(String value) {
return value.toUpperCase();
}
};
}
}

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영문자를 입력받아 대문자를 반환하는 함수
Spring Cloud Function
public class Application {
public Function<String, String> uppercase() {
return value -> value.toUpperCase();
}
}

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영문자를 입력받아 대문자를 반환하는 함수
Spring Cloud Function
public class Application {
public Function<String, String> uppercase() {
return value -> value.toUpperCase();
}
public static void main(String[] args) {
Application application = new Application();
String inStr = "korea spring user group";
String outStr = application.uppercase().apply(inStr);
System.out.println(outStr);
}
}

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Spring Cloud Function
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
영문자를 입력받아 대문자를 반환하는 함수
: Spring Web

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Spring Cloud Function
@SpringBootApplication
@RestController
public class ServerlessApplication {
public Function<String, String> uppercase() {
return value -> value.toUpperCase();
}
@RequestMapping("uppercase")
public String uppercase(@RequestBody String value) {
return uppercase().apply(value);
}
public static void main(String[] args) {
SpringApplication.run(ServerlessApplication.class, args);
}
}
영문자를 입력받아 대문자를 반환하는 함수
: Spring Web

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Spring Cloud Function
>curl -H "Content-Type: text/plain" localhost:8080/uppercase -d hello
>HELLO
영문자를 입력받아 대문자를 반환하는 함수
: Spring Web

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영문자를 입력받아 대문자를 반환하는 함수
: Spring Cloud Function
Spring Cloud Function
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-function-web</artifactId>
</dependency>

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영문자를 입력받아 대문자를 반환하는 함수
: Spring Cloud Function
Spring Cloud Function
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-function-web</artifactId>
</dependency>
Java 8, Springboot 1.5.x

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Spring Cloud Function
@SpringBootApplication
@RestController
public class ServerlessApplication {
public Function<String, String> uppercase() {
return value -> value.toUpperCase();
}
@RequestMapping("uppercase")
public String uppercase(@RequestBody String value) {
return uppercase().apply(value);
}
public static void main(String[] args) {
SpringApplication.run(ServerlessApplication.class, args);
}
}
영문자를 입력받아 대문자를 반환하는 함수
: Spring Web

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Spring Cloud Function
@SpringBootApplication
public class CloudFunctionApplication {
@Bean
public Function<String, String> uppercase() {
return value -> value.toUpperCase();
}
public static void main(String[] args) {
SpringApplication.run(CloudFunctionApplication.class, args);
}
}
영문자를 입력받아 대문자를 반환하는 함수
: Spring Cloud Function

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Spring Cloud Function
>curl -H "Content-Type: text/plain" localhost:8080/uppercase -d hello
>HELLO
영문자를 입력받아 대문자를 반환하는 함수
: Spring Cloud Function

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Functions
16
Spring Cloud Function Web
: Spring Cloud Function Web 흐름도.
Spring Cloud Function
HTTP Web
Spring Boot
Function
Function

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Spring Cloud Function
public interface Function<T, R> {
R apply(T t);
}
Spring Cloud Function
: java.util.function interface

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Spring Cloud Function
public interface Consumer<T> {
void accept(T t);
}
Spring Cloud Function
: java.util.function interface

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Spring Cloud Function
public interface Supplier<T> {
T get();
}
Spring Cloud Function
: java.util.function interface

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Spring Cloud Function Stream
Spring Cloud Function
@SpringBootApplication
public class Application {
@Bean
public Function<Flux<String>, Flux<String>> uppercase() {
return flux -> flux.map(value -> value.toUpperCase());
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

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Functions
21
Spring Cloud Function
Spring Boot
Function
FunctionStream
Message
Spring Cloud Function Stream
: Spring Cloud Function Stream 흐름도.

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Goals
Spring Cloud Function
– Promote the implementation of business logic via functions.
– Decouple the development lifecycle of business logic from any specific runtime target
so that the same code can run as a web endpoint, a stream processor, or a task.
– Support a uniform programming model across serverless providers, as well as the
ability to run standalone (locally or in a PaaS).
– Enable Spring Boot features (auto-configuration, dependency injection, metrics) on
serverless providers.

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Functions
23
Spring Cloud Function Adapter
Spring Cloud Function
HTTP
Serverless Provider
IBM Cloud Function
Function
Function
Adapter
Message
Serverless Provider
AWS Lamda

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Spring Cloud Function Adapter
Spring Cloud Function
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-function-adapter-openwhisk</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-function-adapter-aws</artifactId>
</dependency>

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예제
package functions;
import java.util.Optional;
import java.util.function.Function;
public class Uppercase implements Function<String, String> {
@Override
public String apply(String input) {
return Optional.ofNullable(input).map(String::toUpperCase).orElse("");
}
}
Spring Cloud Function

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예제
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-function-adapter-openwhisk</artifactId>
</dependency>
Spring Cloud Function

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Docker
Spring Cloud Function
https://docs.docker.com/docker-for-mac/install/

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Docker
Spring Cloud Function

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Docker
Spring Cloud Function

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예제
Spring Cloud Function
– Dockerfile
FROM openjdk:8-jdk-alpine
ADD build/libs/function.jar .
ENV JAVA_OPTS=""
ENTRYPOINT [ "java", "-jar", "function.jar", "--function.name=uppercase"]
EXPOSE 8080

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예제
Spring Cloud Function
> docker build -t hspmuse/function-on-spring-cloud-function .

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예제
Spring Cloud Function
> docker push hspmuse/function-on-spring-cloud-function

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예제
Spring Cloud Function
https://hub.docker.com

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예제
Spring Cloud Function
https://hub.docker.com/

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예제
Spring Cloud Function
> bx wsk
action create function-on-spring-cloud-function
-m 512
--docker hspmuse/function-on-spring-cloud-function

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예제
Spring Cloud Function

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예제
Spring Cloud Function
> bx wsk action invoke function-on-spring-cloud-function --param payload
ksug --result

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예제
Spring Cloud Function

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예제
Spring Cloud Function

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예제
Spring Cloud Function

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Spring Cloud Function
https://openwhisk.ng.bluemix.net/api/v1/namespaces/ksug_dev/actions/
function-on-spring-cloud-function

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Spring Cloud Function
Spring Cloud Function

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Serverless
Serverless
Server + less

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Serverless
Serverless
~ less : ~이 없는
Server + less

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Serverless
Serverless
Server + (manage)less

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Serverless Architecture
Serverless
– 특정이벤트에 동작하는 함수를 등록, 이벤트가 발생하면 함수가 실행.
– 서버 관리가 사라진 구조.
– 자동으로 스케일 업/다운.
– 사용한 만큼 비용 지불.
– Faas(Function as a Service)

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IBM Cloud Function 비용
Serverless

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3-tier Architecture
Serverless
참조 : https://martinfowler.com/articles/serverless.html

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Serverless Architecture
Serverless
참조 : https://martinfowler.com/articles/serverless.html

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Serverless Architecture
Serverless
참조 : https://martinfowler.com/articles/serverless.html

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Serverless 추가정보
Serverless
마틴파일러 사이트
https://martinfowler.com/articles/serverless.html
번역본
http://blog.aliencube.org/ko/2016/06/23/serverless-architectures/

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Serverless Provider
Serverless
– IBM Cloud Functions : OpenWhisk
– Amazon Lambda
– Google Cloud Functions.
– Azure Function.
– Fission
– Kubeless
– …….

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Serverless Provider
Serverless
– IBM Cloud Functions : OpenWhisk
– Amazon Lambda
– Google Cloud Functions.
– Azure Function.
– Fission
– Kubeless
– …….

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마무리.
Spring Cloud Function
– Spring Developer : 좀더 친숙하게 Function 개발.
– Function 개발자 : Spring을 알 필요 없음.
– 동일한 코드를 다양한 서버리스 프로바이더에서 실행.
– 서버리스 프로바이더에 독립.
– 동일한 deploy.

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참조.
Spring Cloud Function
– https://spring.io/blog/2017/07/05/introducing-spring-cloud-function
– http://cloud.spring.io/spring-cloud-function
– https://martinfowler.com/articles/serverless.html
( 번역 : http://blog.aliencube.org/ko/2016/06/23/serverless-architectures/ )
– https://www.youtube.com/watch?v=lJEYG2PjGNU
( 발표 PT : http://presos.dsyer.com/decks/road-to-serverless.html )
– http://www.kennybastani.com/2017/07/microservices-to-service-blocks-spring-
cloud-function-aws-lambda.html

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궁금한 점은..…
Spring Cloud Function
– KSUG 구글 그룹
https://groups.google.com/forum/#!categories/ksug
– KSUG 페이스북 그룹
https://www.facebook.com/groups/springkorea/?ref=bookmarks