Adds PubsubAdmin

spring-cloud-gcp-pubsub/pom.xml

@@ -1,5 +1,6 @@
 <?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"
+<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>
 	<parent>
@@ -33,15 +34,17 @@
 			<groupId>io.projectreactor</groupId>
 			<artifactId>reactor-core</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-gcp-core</artifactId>
+		</dependency>
+
+		<!-- Tests -->
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-test</artifactId>
 			<scope>test</scope>
 		</dependency>
-		<dependency>
-			<groupId>org.springframework.cloud</groupId>
-			<artifactId>spring-cloud-gcp-core</artifactId>
-		</dependency>
 	</dependencies>
 
 	<build>

spring-cloud-gcp-pubsub/src/main/java/org/springframework/cloud/gcp/pubsub/PubsubAdmin.java

@@ -0,0 +1,196 @@
+/*
+ *  Copyright 2017 original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.springframework.cloud.gcp.pubsub;
+
+import java.util.List;
+
+import com.google.cloud.pubsub.v1.PagedResponseWrappers;
+import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
+import com.google.cloud.pubsub.v1.TopicAdminClient;
+import com.google.common.collect.Lists;
+import com.google.pubsub.v1.ProjectName;
+import com.google.pubsub.v1.PushConfig;
+import com.google.pubsub.v1.Subscription;
+import com.google.pubsub.v1.SubscriptionName;
+import com.google.pubsub.v1.Topic;
+import com.google.pubsub.v1.TopicName;
+
+import org.springframework.cloud.gcp.core.GcpProjectIdProvider;
+import org.springframework.util.Assert;
+
+/**
+ * Pub/Sub admin utility that creates new topics and subscriptions on Google Cloud Pub/Sub.
+ *
+ * @author João André Martins
+ */
+public class PubsubAdmin {
+
+	private final String projectId;
+
+	private TopicAdminClient topicAdminClient;
+
+	private SubscriptionAdminClient subscriptionAdminClient;
+
+	/** Default inspired in the subscription creation web UI. */
+	private static final int DEFAULT_ACK_DEADLINE = 10;
+
+	public PubsubAdmin(GcpProjectIdProvider projectIdProvider, TopicAdminClient topicAdminClient,
+			SubscriptionAdminClient subscriptionAdminClient) {
+		Assert.notNull(projectIdProvider, "The project ID provider can't be null.");
+		Assert.notNull(topicAdminClient, "The topic administration client can't be null");
+		Assert.notNull(subscriptionAdminClient,
+				"The subscription administration client can't be null");
+
+		this.projectId = projectIdProvider.getProjectId();
+		Assert.hasText(this.projectId, "The project ID can't be null or empty.");
+		this.topicAdminClient = topicAdminClient;
+		this.subscriptionAdminClient = subscriptionAdminClient;
+	}
+
+	/**
+	 * Creates a new topic on Google Cloud Pub/Sub.
+	 *
+	 * @param topicName the name for the new topic
+	 * @return the created topic
+	 */
+	public Topic createTopic(String topicName) {
+		Assert.hasText(topicName, "No topic name was specified.");
+
+		return this.topicAdminClient.createTopic(TopicName.create(this.projectId, topicName));
+	}
+
+	/**
+	 * Deletes a topic from Google Cloud Pub/Sub.
+	 *
+	 * @param topicName the name of the topic to be deleted
+	 */
+	public void deleteTopic(String topicName) {
+		Assert.hasText(topicName, "No topic name was specified.");
+
+		this.topicAdminClient.deleteTopic(TopicName.create(this.projectId, topicName));
+	}
+
+	/**
+	 * Returns every topic in a project.
+	 *
+	 * <p>If there are multiple pages, they will all be merged into the same result.
+	 */
+	public List<Topic> listTopics() {
+		PagedResponseWrappers.ListTopicsPagedResponse topicListPage =
+				this.topicAdminClient.listTopics(ProjectName.create(this.projectId));
+
+		return Lists.newArrayList(topicListPage.iterateAll());
+	}
+
+	/**
+	 * Creates a new subscription on Google Cloud Pub/Sub.
+	 *
+	 * @param subscriptionName the name of the new subscription
+	 * @param topicName the name of the topic being subscribed to
+	 * @return the created subscription
+	 */
+	public Subscription createSubscription(String subscriptionName, String topicName) {
+		return createSubscription(subscriptionName, topicName, null, null);
+	}
+
+	/**
+	 * Creates a new subscription on Google Cloud Pub/Sub.
+	 *
+	 * @param subscriptionName the name of the new subscription
+	 * @param topicName the name of the topic being subscribed to
+	 * @param ackDeadline deadline in seconds before a message is resent. If not provided, set to
+	 *                    default of 10 seconds
+	 * @return the created subscription
+	 */
+	public Subscription createSubscription(String subscriptionName, String topicName,
+			Integer ackDeadline) {
+		return createSubscription(subscriptionName, topicName, ackDeadline, null);
+	}
+
+	/**
+	 * Creates a new subscription on Google Cloud Pub/Sub.
+	 *
+	 * @param subscriptionName the name of the new subscription
+	 * @param topicName the name of the topic being subscribed to
+	 * @param pushEndpoint URL of the service receiving the push messages. If not provided, uses
+	 *                     message pulling by default
+	 * @return the created subscription
+	 */
+	public Subscription createSubscription(String subscriptionName, String topicName,
+			String pushEndpoint) {
+		return createSubscription(subscriptionName, topicName, null, pushEndpoint);
+	}
+
+	/**
+	 * Creates a new subscription on Google Cloud Pub/Sub.
+	 *
+	 * @param subscriptionName the name of the new subscription
+	 * @param topicName the name of the topic being subscribed to
+	 * @param ackDeadline deadline in seconds before a message is resent. If not provided, set to
+	 *                    default of 10 seconds
+	 * @param pushEndpoint URL of the service receiving the push messages. If not provided, uses
+	 *                     message pulling by default
+	 * @return the created subscription
+	 */
+	public Subscription createSubscription(String subscriptionName, String topicName,
+			Integer ackDeadline, String pushEndpoint) {
+		Assert.hasText(subscriptionName, "No subscription name was specified.");
+		Assert.hasText(topicName, "No topic name was specified.");
+
+		int finalAckDeadline = DEFAULT_ACK_DEADLINE;
+		if (ackDeadline != null) {
+			Assert.isTrue(ackDeadline >= 0,
+					"The acknowledgement deadline value can't be negative.");
+			finalAckDeadline = ackDeadline;
+		}
+
+		PushConfig.Builder pushConfigBuilder = PushConfig.newBuilder();
+		if (pushEndpoint != null) {
+			pushConfigBuilder.setPushEndpoint(pushEndpoint);
+		}
+
+		return this.subscriptionAdminClient.createSubscription(
+				SubscriptionName.create(this.projectId, subscriptionName),
+				TopicName.create(this.projectId, topicName),
+				pushConfigBuilder.build(),
+				finalAckDeadline);
+	}
+
+	/**
+	 * Deletes a subscription from Google Cloud Pub/Sub.
+	 *
+	 * @param subscriptionName
+	 */
+	public void deleteSubscription(String subscriptionName) {
+		Assert.hasText(subscriptionName, "No subscription name was specified");
+
+		this.subscriptionAdminClient.deleteSubscription(
+				SubscriptionName.create(this.projectId, subscriptionName));
+	}
+
+	/**
+	 * Returns every subscription in a project.
+	 *
+	 * <p>If there are multiple pages, they will all be merged into the same result.
+	 */
+	public List<Subscription> listSubscriptions() {
+		PagedResponseWrappers.ListSubscriptionsPagedResponse subscriptionsPage =
+				this.subscriptionAdminClient.listSubscriptions(ProjectName.create(this.projectId));
+
+		return Lists.newArrayList(subscriptionsPage.iterateAll());
+	}
+}

spring-cloud-gcp-pubsub/src/test/java/org/springframework/cloud/gcp/pubsub/PubsubAdminTests.java

@@ -0,0 +1,52 @@
+/*
+ *  Copyright 2017 original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package org.springframework.cloud.gcp.pubsub;
+
+import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
+import com.google.cloud.pubsub.v1.TopicAdminClient;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+
+/**
+ * @author João André Martins
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class PubsubAdminTests {
+
+	@Mock
+	private TopicAdminClient mockTopicAdminClient;
+
+	@Mock
+	private SubscriptionAdminClient mockSubscriptionAdminClient;
+
+	@Test(expected = IllegalArgumentException.class)
+	public void testNewPubsubAdmin_nullProjectProvider() {
+		new PubsubAdmin(null, this.mockTopicAdminClient, this.mockSubscriptionAdminClient);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void testNewPubsubAdmin_nullTopicAdminClient() {
+		new PubsubAdmin(() -> "test-project", null, this.mockSubscriptionAdminClient);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void testNewPubsubAdmin_nullSubscriptionAdminClient() {
+		new PubsubAdmin(() -> "test-project", this.mockTopicAdminClient, null);
+	}
+}

spring-cloud-gcp-starters/spring-cloud-gcp-starter-pubsub/src/main/java/org/springframework/cloud/gcp/pubsub/autoconfig/GcpPubsubAutoConfiguration.java

@@ -16,13 +16,16 @@
 
 package org.springframework.cloud.gcp.pubsub.autoconfig;
 
+import java.io.IOException;
 import java.util.concurrent.Executors;
 
 import com.google.api.gax.core.CredentialsProvider;
 import com.google.api.gax.grpc.ChannelProvider;
 import com.google.api.gax.grpc.ExecutorProvider;
 import com.google.api.gax.grpc.FixedExecutorProvider;
+import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
 import com.google.cloud.pubsub.v1.SubscriptionAdminSettings;
+import com.google.cloud.pubsub.v1.TopicAdminClient;
 import com.google.cloud.pubsub.v1.TopicAdminSettings;
 
 import org.springframework.beans.factory.annotation.Qualifier;
@@ -31,6 +34,8 @@
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.cloud.gcp.core.GcpProjectIdProvider;
 import org.springframework.cloud.gcp.core.autoconfig.GcpContextAutoConfiguration;
+import org.springframework.cloud.gcp.pubsub.PubsubAdmin;
+import org.springframework.cloud.gcp.pubsub.core.PubsubException;
 import org.springframework.cloud.gcp.pubsub.core.PubsubTemplate;
 import org.springframework.cloud.gcp.pubsub.support.DefaultPublisherFactory;
 import org.springframework.cloud.gcp.pubsub.support.DefaultSubscriberFactory;
@@ -112,4 +117,16 @@ public PublisherFactory defaultPublisherFactory(GcpProjectIdProvider projectIdPr
 		return new DefaultPublisherFactory(projectIdProvider, subscriberProvider, channelProvider,
 				credentialsProvider);
 	}
+
+	@Bean
+	@ConditionalOnMissingBean
+	public PubsubAdmin pubsubAdmin(GcpProjectIdProvider projectIdProvider) {
+		try {
+			return new PubsubAdmin(projectIdProvider, TopicAdminClient.create(),
+					SubscriptionAdminClient.create());
+		}
+		catch (IOException ioe) {
+			throw new PubsubException("An error occurred while creating PubsubAdmin.", ioe);
+		}
+	}
 }