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Add tomcat operator sample (#659)
 Co-authored-by: Chris Laprun <[email protected]> Co-authored-by: Attila Mészáros <[email protected]>
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‎.github/workflows/end-to-end-tests.yml

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# End to end integration test which deploys the Tomcat operator to a Kubernetes
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# (Kind) cluster and creates custom resources to verify the operator's functionality
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name: TomcatOperator End to End test
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on:
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push:
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branches:
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- "*"
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jobs:
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tomcat_e2e_test:
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runs-on: ubuntu-latest
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env:
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KIND_CL_NAME: e2e-test
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steps:
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- name: Checkout
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uses: actions/checkout@v2
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- name: clean resident local docker
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if: ${{ env.ACT }}
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continue-on-error: true
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run: |
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for DIMG in "$KIND_CL_NAME-control-plane "; do
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docker stop $DIMG ; docker rm $DIMG ;
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done ;
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sleep 1
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- name: Create Kubernetes KinD Cluster
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uses: container-tools/[email protected]
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with:
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cluster_name: e2e-test
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registry: false
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- name: Set up Java and Maven
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uses: actions/setup-java@v2
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with:
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java-version: 11
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distribution: adopt-hotspot
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cache: 'maven'
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- name: Build SDK
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run: mvn install -DskipTests
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- name: build jib
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working-directory: sample-operators/tomcat-operator
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run: |
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mvn --version
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mvn -B package jib:dockerBuild jib:buildTar -Djib-maven-image=tomcat-operator -DskipTests
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kind load image-archive target/jib-image.tar --name=${{ env.KIND_CL_NAME }}
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- name: Apply CRDs
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working-directory: sample-operators/tomcat-operator
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run: |
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kubectl apply -f target/classes/META-INF/fabric8/tomcats.tomcatoperator.io-v1.yml
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kubectl apply -f target/classes/META-INF/fabric8/webapps.tomcatoperator.io-v1.yml
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- name: Deploy Tomcat Operator
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working-directory: sample-operators/tomcat-operator
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run: |
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kubectl apply -f k8s/operator.yaml
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- name: Run E2E Tests
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working-directory: sample-operators/tomcat-operator
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run: mvn -B test -P end-to-end-tests
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- name: Dump state
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if: ${{ failure() }}
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run: |
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set +e
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echo "All namespaces"
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kubectl get ns
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echo "All objects in tomcat-operator"
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kubectl get all -n tomcat-operator -o yaml
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echo "Output of tomcat-operator pod"
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kubectl logs -l app=tomcat-operator -n tomcat-operator
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echo "All objects in tomcat-test"
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kubectl get deployment,pod,tomcat,webapp -n tomcat-test -o yaml
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echo "Output of curl command"
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kubectl logs curl -n tomcat-test

‎operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/CustomResourceCache.java

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@@ -76,7 +76,7 @@ public Optional<T> getLatestResource(String uuid) {
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return Optional.ofNullable(resources.get(uuid)).map(this::clone);
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}
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public List<T> getLatestResources(Predicate<CustomResource> selector) {
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public List<T> getLatestResources(Predicate<T> selector) {
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try {
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lock.lock();
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return resources.values().stream()
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}
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}
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public Set<String> getLatestResourcesUids(Predicate<CustomResource> selector) {
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public Set<String> getLatestResourcesUids(Predicate<T> selector) {
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try {
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lock.lock();
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return resources.values().stream()
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public T cleanup(String customResourceUid) {
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return resources.remove(customResourceUid);
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}
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}

‎operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/DefaultEventSourceManager.java

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public class DefaultEventSourceManager<R extends CustomResource<?, ?>>
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implements EventSourceManager {
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public static final String CUSTOM_RESOURCE_EVENT_SOURCE_NAME = "custom-resource-event-source";
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public static final String RETRY_TIMER_EVENT_SOURCE_NAME = "retry-timer-event-source";
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private static final String CUSTOM_RESOURCE_EVENT_SOURCE_NAME = "custom-resource-event-source";
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private static final Logger log = LoggerFactory.getLogger(DefaultEventSourceManager.class);
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private final ReentrantLock lock = new ReentrantLock();

‎operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/internal/CustomResourceEventSource.java

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}
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}
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// todo: remove
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public CustomResourceCache<T> getCache() {
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return customResourceCache;
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}

‎operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/internal/InformerEventSource.java

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import java.util.Set;
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import java.util.function.Function;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import io.fabric8.kubernetes.api.model.HasMetadata;
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import io.fabric8.kubernetes.client.KubernetesClient;
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import io.fabric8.kubernetes.client.informers.ResourceEventHandler;
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public class InformerEventSource<T extends HasMetadata> extends AbstractEventSource {
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private static final Logger log = LoggerFactory.getLogger(InformerEventSource.class);
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private final SharedInformer<T> sharedInformer;
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private final Function<T, Set<String>> resourceToUIDs;
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private final Function<HasMetadata, T> associatedWith;
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Function<T, Set<String>> resourceToUIDs,
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Function<HasMetadata, T> associatedWith,
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boolean skipUpdateEventPropagationIfNoChange) {
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if (sharedInformer.isRunning()) {
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log.warn(
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"Informer is already running on event source creation, this is not desirable and may " +
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"lead to non deterministic behavior.");
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}
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this.sharedInformer = sharedInformer;
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this.resourceToUIDs = resourceToUIDs;
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this.skipUpdateEventPropagationIfNoChange = skipUpdateEventPropagationIfNoChange;
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}
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uids.forEach(uid -> {
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InformerEvent event = new InformerEvent(uid, this, action, object, oldObject);
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this.eventHandler.handleEvent(event);
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// In case user passes an already running informer this would fail.
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if (this.eventHandler != null) {
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this.eventHandler.handleEvent(event);
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}
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});
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}
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‎pom.xml

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<module>operator-framework-core</module>
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<module>operator-framework-junit5</module>
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<module>operator-framework</module>
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<module>samples</module>
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<module>micrometer-support</module>
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<module>smoke-test-samples</module>
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<module>micrometer-support</module>
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<module>sample-operators</module>
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</modules>
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</includes>
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<excludes>
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<exclude>**/*IT.java</exclude>
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<exclude>**/*E2E.java</exclude>
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</excludes>
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</configuration>
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</plugin>
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<includes>
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<include>**/*Test.java</include>
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<include>**/*IT.java</include>
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<include>**/*E2E.java</include>
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</includes>
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</configuration>
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</plugin>
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</includes>
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<excludes>
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<exclude>**/*Test.java</exclude>
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<exclude>**/*E2E.java</exclude>
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</excludes>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</profile>
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<profile>
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<id>end-to-end-tests</id>
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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-surefire-plugin</artifactId>
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<configuration>
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<includes>
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<include>**/*E2E.java</include>
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</includes>
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<excludes>
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<exclude>**/*Test.java</exclude>
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<exclude>**/*IT.java</exclude>
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</excludes>
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</configuration>
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</plugin>
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<configuration>
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<excludes>
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<exclude>**/*IT.java</exclude>
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<exclude>**/*E2E.java</exclude>
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</excludes>
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</configuration>
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</plugin>

‎sample-operators/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.javaoperatorsdk</groupId>
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<artifactId>java-operator-sdk</artifactId>
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<version>1.9.12-SNAPSHOT</version>
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</parent>
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<artifactId>sample-operators</artifactId>
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<name>Operator SDK - Samples</name>
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<packaging>pom</packaging>
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<properties>
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<jib-maven-plugin.version>3.1.4</jib-maven-plugin.version>
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</properties>
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<modules>
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<module>tomcat-operator</module>
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</modules>
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<dependencies>
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<dependency>
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<groupId>io.javaoperatorsdk</groupId>
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<artifactId>operator-framework</artifactId>
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<version>1.9.2</version>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-slf4j-impl</artifactId>
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<version>2.13.3</version>
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</dependency>
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<dependency>
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<groupId>org.takes</groupId>
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<artifactId>takes</artifactId>
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<version>1.19</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.13.1</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.awaitility</groupId>
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<artifactId>awaitility</artifactId>
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<version>4.1.0</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>com.google.cloud.tools</groupId>
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<artifactId>jib-maven-plugin</artifactId>
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<version>${jib-maven-plugin.version}</version>
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<configuration>
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<from>
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<image>gcr.io/distroless/java:11</image>
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</from>
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<to>
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<image>tomcat-operator</image>
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</to>
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</configuration>
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</plugin>
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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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</plugin>
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</plugins>
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</build>
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</project>

‎sample-operators/tomcat-operator/README.md

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# Tomcat Operator
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Creates a Tomcat deployment from a Custom Resource, while keeping the WAR separated with another Custom Resource.
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This sample demonstrates the following capabilities of the Java Operator SDK:
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* Multiple Controllers in a single Operator. The Tomcat resource is managed by the TomcatController while the Webapp
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resource is managed by the WebappController.
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* Reacting to events about resources created by the controller. The TomcatController will receive events about the
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Deployment resources it created. See EventSource section below for more detail.
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## Example input for creating a Tomcat instance
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```
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apiVersion: "tomcatoperator.io/v1"
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kind: Tomcat
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metadata:
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name: test-tomcat1
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spec:
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version: 9.0
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replicas: 2
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```
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## Example input for the Webapp
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```
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apiVersion: "tomcatoperator.io/v1"
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kind: Webapp
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metadata:
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name: sample-webapp1
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spec:
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tomcat: test-tomcat1
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url: http://tomcat.apache.org/tomcat-7.0-doc/appdev/sample/sample.war
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contextPath: mysample
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```
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## Getting started / Testing
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The quickest way to try the operator is to run it on your local machine, while it connects to a
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local or remote Kubernetes cluster. When you start it, it will use the current kubectl context on
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your machine to connect to the cluster.
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Before you run it you have to install the CRDs on your cluster by running:
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- `kubectl apply -f target/classes/META-INF/fabric8/tomcats.tomcatoperator.io-v1.yml`
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- `kubectl apply -f target/classes/META-INF/fabric8/webapps.tomcatoperator.io-v1.yml`
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The CRDs are generated automatically from your code by simply adding the `crd-generator-apt`
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dependency to your `pom.xml` file.
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When the Operator is running you can create some Tomcat Custom Resources. You can find a sample
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custom resources in the k8s folder.
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If you want the Operator to be running as a deployment in your cluster, follow the below steps.
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## Build
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You can build the sample using `mvn install jib:dockerBuild` this will produce a Docker image you
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can push to the registry of your choice. The JAR file is built using your local Maven and JDK and
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then copied into the Docker image.
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## Install Operator into cluster
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Install the CRDs as shown above if you haven't already, then
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run `kubectl apply -f k8s/operator.yaml`. Now you can create Tomcat instances with CRs (see examples
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above).
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## EventSources
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The TomcatController is listening to events about Deployments created by the TomcatOperator by registering a
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InformerEventSource with the EventSourceManager. The InformerEventSource will in turn register a watch on
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all Deployments managed by the Controller (identified by the `app.kubernetes.io/managed-by` label).
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When an event from a Deployment is received we have to identify which Tomcat object does the Deployment
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belong to. This is done when the InformerEventSource creates the event.
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The TomcatController has to take care of setting the `app.kubernetes.io/managed-by` label on the Deployment so the
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InformerEventSource can watch the right Deployments.
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The TomcatController also has to set `ownerReference` on the Deployment so later the InformerEventSource can
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identify which Tomcat does the Deployment belong to. This is necessary so the frameowork can call the Controller
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`createOrUpdate` method correctly.
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