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feat:add a multi rule ALB sample with host and path based routing (#257)
* add a multi rule ALB sample with a combination of host and path based routing * Update java/alb-multi-rule-response/README.md
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‎java/alb-multi-rule-response/.gitignore‎

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.classpath.txt
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target
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.classpath
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.project
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.idea
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.settings
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.vscode
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*.iml
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# CDK asset staging directory
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.cdk.staging
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cdk.out
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‎java/alb-multi-rule-response/README.md‎

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<!--BEGIN STABILITY BANNER-->
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---
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![Stability: Stable](https://img.shields.io/badge/stability-Stable-success.svg?style=for-the-badge)
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> **This is a stable example. It should successfully build out of the box**
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>
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> This examples does is built on Construct Libraries marked "Stable" and does not have any infrastructure prerequisites to build.
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---
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<!--END STABILITY BANNER-->
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# ALB using a combination of host and path based routing with Java AWS-CDK
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The ALB is backed by an EC2 instance acting as frontend client and built-in ALB response rules that simulates mobile and application api
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## Testing the responses
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### testing mobile produciton api
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``` bash
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curl -H "Host: mobile.mydomain.com" [ALB-DNS-FQDN]/production
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```
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Resonse received
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```json
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{"status":"succes","apiversion":"prod_mobile_v1"}
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```
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### Testing frontend production api
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``` bash
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curl -H "Host: api.mydomain.com" [ALB-DNS-FQDN]/production
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```
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```json
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{"status":"succes","apiversion":"prod_api_v1"}
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```
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## List of ALB rules
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![alt text](imgs/screenshot.png "screenshot of resulting rule")
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It is a Maven-based project, so you can open this directory with any Maven-compatible Java IDE, and you should be able to build and run tests from your IDE.
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You should explore the contents of this template. It demonstrates a CDK app to create a multi-rule ALB, based on path and host headers.
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More information on ALB and Path routing is available here https://docs.aws.amazon.com/elasticloadbalancing/latest/application/tutorial-load-balancer-routing.html
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The cdk.json file tells the CDK Toolkit how to execute your app. This example relies on maven to do that.
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## Useful commands
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* `mvn package` compile and run tests
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* `cdk ls` list all stacks in the app
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* `cdk synth` emits the synthesized CloudFormation template
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* `cdk deploy` deploy this stack to your default AWS account/region
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* `cdk diff` compare deployed stack with current state
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* `cdk docs` open CDK documentation
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Enjoy!

‎java/alb-multi-rule-response/cdk.json‎

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{
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"app": "mvn -e -q exec:java"
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}

‎java/alb-multi-rule-response/imgs/screenshot.png‎

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‎java/alb-multi-rule-response/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
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xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.myorg</groupId>
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<artifactId>albcdkproject</artifactId>
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<version>0.1</version>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.1</version>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>exec-maven-plugin</artifactId>
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<version>1.6.0</version>
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<configuration>
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<mainClass>com.myorg.ALBProjectApp</mainClass>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<!-- AWS Cloud Development Kit -->
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<dependency>
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<groupId>software.amazon.awscdk</groupId>
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<artifactId>core</artifactId>
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<version>[1.26.0, 2)</version>
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</dependency>
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<dependency>
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<groupId>software.amazon.awscdk</groupId>
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<artifactId>elasticloadbalancingv2</artifactId>
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<version>[1.26.0, 2)</version>
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</dependency>
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<dependency>
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<groupId>software.amazon.awscdk</groupId>
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<artifactId>ec2</artifactId>
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<version>[1.26.0, 2)</version>
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</dependency>
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<dependency>
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<groupId>software.amazon.awscdk</groupId>
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<artifactId>autoscaling</artifactId>
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<version>[1.26.0,2)</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/junit/junit -->
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎java/alb-multi-rule-response/src/main/java/com/myorg/ALBProjectApp.java‎

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package com.myorg;
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import software.amazon.awscdk.core.App;
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import software.amazon.awscdk.core.Environment;
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import software.amazon.awscdk.core.StackProps;
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public class ALBProjectApp {
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public static void main(final String[] args) {
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App app = new App();
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new ALBProjectStack(
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app, "ALBProjectStack", StackProps.builder().env(Environment.builder().build()).build());
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app.synth();
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}
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}

‎java/alb-multi-rule-response/src/main/java/com/myorg/ALBProjectStack.java‎

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package com.myorg;
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import com.myorg.utils.PropertyLoader;
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import java.util.ArrayList;
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import java.util.List;
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import software.amazon.awscdk.core.Construct;
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import software.amazon.awscdk.core.Stack;
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import software.amazon.awscdk.core.StackProps;
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import software.amazon.awscdk.services.autoscaling.AutoScalingGroup;
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import software.amazon.awscdk.services.ec2.AmazonLinuxImage;
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import software.amazon.awscdk.services.ec2.InstanceClass;
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import software.amazon.awscdk.services.ec2.InstanceSize;
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import software.amazon.awscdk.services.ec2.InstanceType;
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import software.amazon.awscdk.services.ec2.Vpc;
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import software.amazon.awscdk.services.elasticloadbalancingv2.ApplicationListener;
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import software.amazon.awscdk.services.elasticloadbalancingv2.ApplicationListenerRule;
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import software.amazon.awscdk.services.elasticloadbalancingv2.ApplicationLoadBalancer;
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import software.amazon.awscdk.services.elasticloadbalancingv2.ApplicationProtocol;
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import software.amazon.awscdk.services.elasticloadbalancingv2.ApplicationTargetGroup;
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import software.amazon.awscdk.services.elasticloadbalancingv2.ApplicationTargetGroupProps;
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import software.amazon.awscdk.services.elasticloadbalancingv2.ContentType;
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import software.amazon.awscdk.services.elasticloadbalancingv2.FixedResponse;
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import software.amazon.awscdk.services.elasticloadbalancingv2.IApplicationLoadBalancerTarget;
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import software.amazon.awscdk.services.elasticloadbalancingv2.IApplicationTargetGroup;
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import software.amazon.awscdk.services.elasticloadbalancingv2.TargetType;
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public class ALBProjectStack extends Stack {
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public ALBProjectStack(final Construct scope, final String id) {
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this(scope, id, null);
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}
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public ALBProjectStack(final Construct scope, final String id, final StackProps props) {
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super(scope, id, props);
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// property loader
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PropertyLoader propertyLoad = new PropertyLoader();
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// create ALB and all anciliarry services
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Vpc vpc = Vpc.Builder.create(this, "VPC").build();
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AutoScalingGroup asg =
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AutoScalingGroup.Builder.create(this, "ASG")
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.vpc(vpc)
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.instanceType(InstanceType.of(InstanceClass.BURSTABLE2, InstanceSize.MICRO))
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.userData(propertyLoad.getUserData())
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.machineImage(new AmazonLinuxImage())
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.build();
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ApplicationLoadBalancer lb =
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ApplicationLoadBalancer.Builder.create(this, "LB")
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.vpc(vpc)
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.internetFacing(Boolean.TRUE)
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.loadBalancerName("myalb")
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.build();
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List<IApplicationLoadBalancerTarget> targets = new ArrayList<IApplicationLoadBalancerTarget>();
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targets.add(asg);
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ApplicationTargetGroup webTargetGroup =
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new ApplicationTargetGroup(
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this,
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"MyTargetGroup",
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ApplicationTargetGroupProps.builder()
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.vpc(vpc)
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.targetType(TargetType.INSTANCE)
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.targets(targets)
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.port(80)
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.protocol(ApplicationProtocol.HTTP)
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.build());
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List<IApplicationTargetGroup> targetGroups = new ArrayList<IApplicationTargetGroup>();
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targetGroups.add(webTargetGroup);
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// default listener
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ApplicationListener http =
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ApplicationListener.Builder.create(this, "HTTP")
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.port(80)
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.protocol(ApplicationProtocol.HTTP)
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.open(true)
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.loadBalancer(lb)
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.defaultTargetGroups(targetGroups)
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.build();
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// adding application listern rules
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ApplicationListenerRule alrProdApi =
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ApplicationListenerRule.Builder.create(this, "prodApi")
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.pathPattern("/production")
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.priority(1)
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.listener(http)
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.hostHeader(propertyLoad.getRestAPIHostHeader())
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.build();
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ApplicationListenerRule alrProdM =
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ApplicationListenerRule.Builder.create(this, "prodMobile")
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.pathPattern("/production")
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.priority(2)
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.listener(http)
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.hostHeader(propertyLoad.getRestMobileHostHeader())
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.build();
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ApplicationListenerRule alrSandboxApi =
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ApplicationListenerRule.Builder.create(this, "sandboxApi")
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.pathPattern("/sandbox")
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.priority(3)
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.listener(http)
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.hostHeader(propertyLoad.getRestAPIHostHeader())
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.build();
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ApplicationListenerRule alrSandboxM =
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ApplicationListenerRule.Builder.create(this, "sandboxMobile")
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.pathPattern("/sandbox")
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.priority(4)
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.listener(http)
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.hostHeader(propertyLoad.getRestMobileHostHeader())
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.build();
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// adding fixed responses
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alrProdApi.addFixedResponse(
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FixedResponse.builder()
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.statusCode("200")
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.contentType(ContentType.APPLICATION_JSON)
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.messageBody(propertyLoad.getProdApiMessageBody())
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.build());
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alrProdM.addFixedResponse(
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FixedResponse.builder()
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.statusCode("200")
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.contentType(ContentType.APPLICATION_JSON)
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.messageBody(propertyLoad.getProdMobileMessageBody())
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.build());
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alrSandboxApi.addFixedResponse(
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FixedResponse.builder()
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.statusCode("200")
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.contentType(ContentType.APPLICATION_JSON)
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.messageBody(propertyLoad.getSandboxApiMessageBody())
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.build());
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alrSandboxM.addFixedResponse(
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FixedResponse.builder()
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.statusCode("200")
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.contentType(ContentType.APPLICATION_JSON)
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.messageBody(propertyLoad.getSandboxMobileMessageBody())
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.build());
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}
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}

‎java/alb-multi-rule-response/src/main/java/com/myorg/utils/PropertyLoader.java‎

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package com.myorg.utils;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Properties;
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import software.amazon.awscdk.services.ec2.UserData;
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public class PropertyLoader {
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private final UserData userData;
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private String prodMobileMessageBody;
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private String prodApiMessageBody;
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private String sandboxApiMessageBody;
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private String sandboxMobileMessageBody;
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private String restAPIHostHeader;
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private String restMobileHostHeader;
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public PropertyLoader() {
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userData = UserData.forLinux();
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load();
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}
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public UserData getUserData() {
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return userData;
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}
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public String getProdMobileMessageBody() {
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return prodMobileMessageBody;
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}
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public String getProdApiMessageBody() {
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return prodApiMessageBody;
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}
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public String getSandboxApiMessageBody() {
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return sandboxApiMessageBody;
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}
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public String getSandboxMobileMessageBody() {
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return sandboxMobileMessageBody;
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}
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public String getRestAPIHostHeader() {
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return restAPIHostHeader;
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}
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public String getRestMobileHostHeader() {
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return restMobileHostHeader;
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}
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private void load() {
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// start loading data from the properties files
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try (InputStream input =
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PropertyLoader.class.getClassLoader().getResourceAsStream("mydata.properties")) {
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Properties prop = new Properties();
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if (input == null) {
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System.out.println("unable to find mydata.properties");
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return;
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}
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// get the values from the properties file
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prop.load(input);
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// start populating values
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prodMobileMessageBody = prop.getProperty("response.prodMobileV1");
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prodApiMessageBody = prop.getProperty("response.prodApiV1");
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sandboxApiMessageBody = prop.getProperty("response.sandboxApiV1");
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sandboxMobileMessageBody = prop.getProperty("response.sandboxMobileV1");
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restAPIHostHeader = prop.getProperty("rest.api");
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restMobileHostHeader = prop.getProperty("rest.mobile");
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String[] cmds = prop.getProperty("userData.commands").split("\n");
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if (cmds.length > 0) {
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for (String cmd : cmds) {
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userData.addCommands(cmd);
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}
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}
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} catch (IOException ex) {
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ex.printStackTrace();
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}
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}
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}

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