Spring Cloud Functions with AWS

Issue: BAEL-1726

spring-cloud/pom.xml

@@ -33,6 +33,7 @@
         <module>spring-cloud-contract</module>
         <module>spring-cloud-kubernetes</module>
         <module>spring-cloud-archaius</module>
+        <module>spring-cloud-functions</module>        
         <module>spring-cloud-vault</module>
     </modules>
 

spring-cloud/spring-cloud-functions/pom.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>spring-cloud-functions</artifactId>
+    <packaging>pom</packaging>
+
+    <parent>
+        <artifactId>parent-boot-2</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../../parent-boot-2</relativePath>
+    </parent>
+
+    <modules>
+        <module>spring-cloud-function-aws</module>
+    </modules>
+    
+</project>

spring-cloud/spring-cloud-functions/spring-cloud-function-aws/pom.xml

@@ -0,0 +1,94 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.baeldung.spring</groupId>
+    <artifactId>cloudfunction-aws</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <packaging>jar</packaging>
+
+    <name>cloudfunction-aws</name>
+    <description>Demo project for Spring Cloud Function</description>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.0.4.RELEASE</version>
+        <relativePath/>
+    </parent>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <java.version>1.8</java.version>
+        <spring-cloud-function.version>1.0.1.RELEASE</spring-cloud-function.version>
+        <aws-lambda-events.version>2.0.2</aws-lambda-events.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-function-adapter-aws</artifactId>
+            <version>${spring-cloud-function.version}</version>
+        </dependency>
+        <!-- We don't need spring-cloud-starter-function-web when deploying to AWS-->
+        <!-- It is used only for local testing-->
+         <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-function-web</artifactId>
+            <version>1.0.1.RELEASE</version>
+        </dependency>
+        <dependency>
+            <groupId>com.amazonaws</groupId>
+            <artifactId>aws-lambda-java-events</artifactId>
+            <version>${aws-lambda-events.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.amazonaws</groupId>
+            <artifactId>aws-lambda-java-core</artifactId>
+            <version>1.1.0</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-deploy-plugin</artifactId>
+                <configuration>
+                    <skip>true</skip>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <dependencies>
+                    <dependency>
+                        <groupId>org.springframework.boot.experimental</groupId>
+                        <artifactId>spring-boot-thin-layout</artifactId>
+                        <version>1.0.10.RELEASE</version>
+                    </dependency>
+                </dependencies>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <configuration>
+                    <createDependencyReducedPom>false</createDependencyReducedPom>
+                    <shadedArtifactAttached>true</shadedArtifactAttached>
+                    <shadedClassifierName>aws</shadedClassifierName>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

spring-cloud/spring-cloud-functions/spring-cloud-function-aws/src/main/java/com/baeldung/spring/cloudfunction/CloudFunctionAwsApplication.java

@@ -0,0 +1,23 @@
+package com.baeldung.spring.cloudfunction;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+@SpringBootApplication
+public class CloudFunctionAwsApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(CloudFunctionAwsApplication.class, args);
+    }
+
+    @Bean
+    public Function<String, String> reverseString() {
+        return value -> new StringBuilder(value).reverse().toString();
+    }
+
+}

spring-cloud/spring-cloud-functions/spring-cloud-function-aws/src/main/java/com/baeldung/spring/cloudfunction/StringReverseHandler.java

@@ -0,0 +1,7 @@
+package com.baeldung.spring.cloudfunction;
+
+import org.springframework.cloud.function.adapter.aws.SpringBootRequestHandler;
+
+public class StringReverseHandler extends SpringBootRequestHandler<String, String> {
+
+}

spring-cloud/spring-cloud-functions/spring-cloud-function-aws/src/main/java/com/baeldung/spring/cloudfunction/functions/Greeter.java

@@ -0,0 +1,11 @@
+package com.baeldung.spring.cloudfunction.functions;
+
+import java.util.function.Function;
+
+public class Greeter implements Function<String, String> {
+
+    @Override
+    public String apply(String s) {
+        return "Hello " + s + ", and welcome to Spring Cloud Function!!!";
+    }
+}

spring-cloud/spring-cloud-functions/spring-cloud-function-aws/src/main/resources/application.properties

@@ -0,0 +1 @@
+spring.cloud.function.scan.packages: com.baeldung.spring.cloudfunction.functions

spring-cloud/spring-cloud-functions/spring-cloud-function-aws/src/test/java/com/baeldung/spring/cloudfunction/CloudFunctionApplicationTests.java

@@ -0,0 +1,33 @@
+package com.baeldung.spring.cloudfunction;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.boot.web.server.LocalServerPort;
+
+import static org.assertj.core.api.Java6Assertions.assertThat;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
+public class CloudFunctionApplicationTests {
+
+    @LocalServerPort
+    private int port;
+
+    @Autowired
+    private TestRestTemplate testRestTemplate;
+
+    @Test
+    public void givenAString_whenReverseStringCloudFunctionInvoked_thenStringIsReversed() {  
+        assertThat(this.testRestTemplate.getForObject("http://localhost:" + port + "/reverseString/HelloWorld", String.class)).isEqualTo("dlroWolleH");
+    }
+
+    @Test
+    public void givenAString_whenGreeterCloudFunctionInvoked_thenPrintsGreeting() {        	  
+        assertThat(this.testRestTemplate.getForObject("http://localhost:" + port + "/greeter/BaeldungUser", String.class)).isEqualTo("Hello BaeldungUser, and welcome to Spring Cloud Function!!!");
+    }
+
+}