469 lines
16 KiB
HTML
469 lines
16 KiB
HTML
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<body class="book toc2 toc-left">
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<div id="header">
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<div id="toc" class="toc2">
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<div id="toctitle">Table of Contents</div>
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<ul class="sectlevel2">
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<li><a href="#_google_cloud_functions_alpha">Google Cloud Functions (Alpha)</a></li>
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</ul>
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</div>
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</div>
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<div id="content">
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<div id="preamble">
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<div class="sectionbody">
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<div class="paragraph">
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<p><strong>3.0.7.RELEASE</strong></p>
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</div>
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</div>
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</div>
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<div class="sect2">
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<h3 id="_google_cloud_functions_alpha"><a class="link" href="#_google_cloud_functions_alpha">Google Cloud Functions (Alpha)</a></h3>
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<div class="paragraph">
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<p>The Google Cloud Functions adapter enables Spring Cloud Function apps to run on the <a href="https://cloud.google.com/functions">Google Cloud Functions</a> serverless platform.
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You can either run the function locally using the open source <a href="https://github.com/GoogleCloudPlatform/functions-framework-java">Google Functions Framework for Java</a> or on GCP.</p>
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</div>
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<div class="sect3">
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<h4 id="_project_dependencies"><a class="link" href="#_project_dependencies">Project Dependencies</a></h4>
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<div class="paragraph">
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<p>Start by adding the <code>spring-cloud-function-adapter-gcp</code> dependency to your project.</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><dependencies>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-function-adapter-gcp</artifactId>
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</dependency>
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...
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</dependencies></code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>In addition, add the <code>spring-boot-maven-plugin</code> which will build the JAR of the function to deploy.</p>
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</div>
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<div class="admonitionblock note">
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<table>
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<tr>
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<td class="icon">
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<i class="fa icon-note" title="Note"></i>
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</td>
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<td class="content">
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Notice that we also reference <code>spring-cloud-function-adapter-gcp</code> as a dependency of the <code>spring-boot-maven-plugin</code>. This is necessary because it modifies the plugin to package your function in the correct JAR format for deployment on Google Cloud Functions.
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</td>
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</tr>
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</table>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<configuration>
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<outputDirectory>target/deploy</outputDirectory>
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</configuration>
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<dependencies>
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-function-adapter-gcp</artifactId>
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</dependency>
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</dependencies>
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</plugin></code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Finally, add the Maven plugin provided as part of the Google Functions Framework for Java.
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This allows you to test your functions locally via <code>mvn function:run</code>.</p>
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</div>
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<div class="admonitionblock note">
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<table>
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<tr>
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<td class="icon">
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<i class="fa icon-note" title="Note"></i>
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</td>
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<td class="content">
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The function target should always be set to <code>org.springframework.cloud.function.adapter.gcp.GcfJarLauncher</code>; this is an adapter class which acts as the entry point to your Spring Cloud Function from the Google Cloud Functions platform.
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</td>
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</tr>
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</table>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code class="language-xml hljs" data-lang="xml"><plugin>
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<groupId>com.google.cloud.functions</groupId>
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<artifactId>function-maven-plugin</artifactId>
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<version>0.9.1</version>
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<configuration>
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<functionTarget>org.springframework.cloud.function.adapter.gcp.GcfJarLauncher</functionTarget>
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<port>8080</port>
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</configuration>
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</plugin></code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>A full example of a working <code>pom.xml</code> can be found in the <a href="https://github.com/spring-cloud/spring-cloud-function/blob/master/spring-cloud-function-samples/function-sample-gcp-http/pom.xml">Spring Cloud Functions GCP sample</a>.</p>
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</div>
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</div>
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<div class="sect3">
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<h4 id="_http_functions"><a class="link" href="#_http_functions">HTTP Functions</a></h4>
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<div class="paragraph">
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<p>Google Cloud Functions supports deploying <a href="https://cloud.google.com/functions/docs/writing/http">HTTP Functions</a>, which are functions that are invoked by HTTP request. The sections below describe instructions for deploying a Spring Cloud Function as an HTTP Function.</p>
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</div>
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<div class="sect4">
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<h5 id="_getting_started"><a class="link" href="#_getting_started">Getting Started</a></h5>
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<div class="paragraph">
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<p>Let’s start with a simple Spring Cloud Function example:</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@SpringBootApplication
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public class CloudFunctionMain {
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public static void main(String[] args) {
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SpringApplication.run(CloudFunctionMain.class, args);
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}
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@Bean
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public Function<String, String> uppercase() {
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return value -> value.toUpperCase();
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}
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}</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Specify your configuration main class in <code>resources/META-INF/MANIFEST.MF</code>.</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code>Main-Class: com.example.CloudFunctionMain</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Then run the function locally.
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This is provided by the Google Cloud Functions <code>function-maven-plugin</code> described in the project dependencies section.</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>mvn function:run</pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Invoke the HTTP function:</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>curl http://localhost:8080/ -d "hello"</pre>
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</div>
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</div>
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</div>
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<div class="sect4">
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<h5 id="_deploy_to_gcp"><a class="link" href="#_deploy_to_gcp">Deploy to GCP</a></h5>
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<div class="paragraph">
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<p>As of March 2020, Google Cloud Functions for Java is in Alpha.
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You can get on the <a href="https://docs.google.com/forms/d/e/1FAIpQLScC98jGi7CfG0n3UYlj7Xad8XScvZC8-BBOg7Pk3uSZx_2cdQ/viewform">whitelist</a> to try it out.</p>
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</div>
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<div class="paragraph">
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<p>Start by packaging your application.</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>mvn package</pre>
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</div>
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</div>
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<div class="paragraph">
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<p>If you added the custom <code>spring-boot-maven-plugin</code> plugin defined above, you should see the resulting JAR in <code>target/deploy</code> directory.
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This JAR is correctly formatted for deployment to Google Cloud Functions.</p>
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</div>
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<div class="paragraph">
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<p>Next, make sure that you have the <a href="https://cloud.google.com/sdk/install">Cloud SDK CLI</a> installed.</p>
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</div>
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<div class="paragraph">
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<p>From the project base directory run the following command to deploy.</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>gcloud alpha functions deploy function-sample-gcp-http \
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--entry-point org.springframework.cloud.function.adapter.gcp.GcfJarLauncher \
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--runtime java11 \
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--trigger-http \
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--source target/deploy \
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--memory 512MB</pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Invoke the HTTP function:</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre>curl https://REGION-PROJECT_ID.cloudfunctions.net/function-sample-gcp-http -d "hello"</pre>
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</div>
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</div>
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</div>
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</div>
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<div class="sect3">
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<h4 id="_background_functions"><a class="link" href="#_background_functions">Background Functions</a></h4>
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<div class="paragraph">
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<p>Google Cloud Functions also supports deploying <a href="https://cloud.google.com/functions/docs/writing/background">Background Functions</a> which are invoked indirectly in response to an event, such as a message on a <a href="https://cloud.google.com/pubsub">Cloud Pub/Sub</a> topic, a change in a <a href="https://cloud.google.com/storage">Cloud Storage</a> bucket, or a <a href="https://firebase.google.com/">Firebase</a> event.</p>
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</div>
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<div class="paragraph">
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<p>The <code>spring-cloud-function-adapter-gcp</code> allows for functions to be deployed as background functions as well.</p>
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</div>
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<div class="paragraph">
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<p>The sections below describe the process for writing a Cloud Pub/Sub topic background function.
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However, there are a number of different event types that can trigger a background function to execute which are not discussed here; these are described in the <a href="https://cloud.google.com/functions/docs/calling">Background Function triggers documentation</a>.</p>
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</div>
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<div class="sect4">
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<h5 id="_getting_started_2"><a class="link" href="#_getting_started_2">Getting Started</a></h5>
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<div class="paragraph">
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||
<p>Let’s start with a simple Spring Cloud Function which will run as a GCF background function:</p>
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||
</div>
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||
<div class="listingblock">
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||
<div class="content">
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||
<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">@SpringBootApplication
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public class BackgroundFunctionMain {
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public static void main(String[] args) {
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SpringApplication.run(BackgroundFunctionMain.class, args);
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}
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@Bean
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public Consumer<PubSubMessage> pubSubFunction() {
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return message -> System.out.println("The Pub/Sub message data: " + message.getData());
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}
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}</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>In addition, create <code>PubSubMessage</code> class in the project with the below definition.
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This class represents the <a href="https://cloud.google.com/functions/docs/calling/pubsub#event_structure">Pub/Sub event structure</a> which gets passed to your function on a Pub/Sub topic event.</p>
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</div>
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<div class="listingblock">
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<div class="content">
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<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class PubSubMessage {
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private String data;
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private Map<String, String> attributes;
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private String messageId;
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private String publishTime;
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public String getData() {
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return data;
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}
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public void setData(String data) {
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this.data = data;
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}
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public Map<String, String> getAttributes() {
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return attributes;
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}
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public void setAttributes(Map<String, String> attributes) {
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this.attributes = attributes;
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}
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public String getMessageId() {
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return messageId;
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}
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public void setMessageId(String messageId) {
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this.messageId = messageId;
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}
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public String getPublishTime() {
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return publishTime;
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}
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public void setPublishTime(String publishTime) {
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this.publishTime = publishTime;
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}
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}</code></pre>
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</div>
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</div>
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<div class="paragraph">
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<p>Specify your configuration main class in <code>resources/META-INF/MANIFEST.MF</code>.</p>
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</div>
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||
<div class="listingblock">
|
||
<div class="content">
|
||
<pre class="highlightjs highlight"><code>Main-Class: com.example.BackgroundFunctionMain</code></pre>
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||
</div>
|
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</div>
|
||
<div class="paragraph">
|
||
<p>Then run the function locally.
|
||
This is provided by the Google Cloud Functions <code>function-maven-plugin</code> described in the project dependencies section.</p>
|
||
</div>
|
||
<div class="listingblock">
|
||
<div class="content">
|
||
<pre>mvn function:run</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Invoke the HTTP function:</p>
|
||
</div>
|
||
<div class="listingblock">
|
||
<div class="content">
|
||
<pre>curl localhost:8080 -H "Content-Type: application/json" -d '{"data":"hello"}'</pre>
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</div>
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</div>
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<div class="paragraph">
|
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<p>Verify that the function was invoked by viewing the logs.</p>
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</div>
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</div>
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||
<div class="sect4">
|
||
<h5 id="_deploy_to_gcp_2"><a class="link" href="#_deploy_to_gcp_2">Deploy to GCP</a></h5>
|
||
<div class="paragraph">
|
||
<p>In order to deploy your background function to GCP, first package your application.</p>
|
||
</div>
|
||
<div class="listingblock">
|
||
<div class="content">
|
||
<pre>mvn package</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>If you added the custom <code>spring-boot-maven-plugin</code> plugin defined above, you should see the resulting JAR in <code>target/deploy</code> directory.
|
||
This JAR is correctly formatted for deployment to Google Cloud Functions.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Next, make sure that you have the <a href="https://cloud.google.com/sdk/install">Cloud SDK CLI</a> installed.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>From the project base directory run the following command to deploy.</p>
|
||
</div>
|
||
<div class="listingblock">
|
||
<div class="content">
|
||
<pre>gcloud alpha functions deploy function-sample-gcp-background \
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--entry-point org.springframework.cloud.function.adapter.gcp.GcfJarLauncher \
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||
--runtime java11 \
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--trigger-topic my-functions-topic \
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--source target/deploy \
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||
--memory 512MB</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Google Cloud Function will now invoke the function every time a message is published to the topic specified by <code>--trigger-topic</code>.</p>
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||
</div>
|
||
<div class="paragraph">
|
||
<p>For a walkthrough on testing and verifying your background function, see the instructions for running the <a href="https://github.com/spring-cloud/spring-cloud-function/tree/master/spring-cloud-function-samples/function-sample-gcp-background/">GCF Background Function sample</a>.</p>
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||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="sect3">
|
||
<h4 id="_sample_functions"><a class="link" href="#_sample_functions">Sample Functions</a></h4>
|
||
<div class="paragraph">
|
||
<p>The project provides the following sample functions as reference:</p>
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||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>The <a href="https://github.com/spring-cloud/spring-cloud-function/tree/master/spring-cloud-function-samples/function-sample-gcp-http/">function-sample-gcp-http</a> is an HTTP Function which you can test locally and try deploying.</p>
|
||
</li>
|
||
<li>
|
||
<p>The <a href="https://github.com/spring-cloud/spring-cloud-function/tree/master/spring-cloud-function-samples/function-sample-gcp-background/">function-sample-gcp-background</a> shows an example of a background function that is triggered by a message being published to a specified Pub/Sub topic.</p>
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||
</li>
|
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</ul>
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