Merge pull request #479 from meltsufin/gcp-sample-doc

Adds Readme to GCP sample app

docs/src/main/asciidoc/adapters/gcp-intro.adoc

@@ -130,3 +130,7 @@ Invoke the HTTP function:
 ----
 curl https://REGION-PROJECT_ID.cloudfunctions.net/function-sample-gcp -d "hello"
 ----
+
+==== Sample Function
+
+Go to the link:../../spring-cloud-function-samples/function-sample-gcp/[function-sample-gcp] to try out a sample function that you can test locally or deploy to GCP.

docs/src/main/asciidoc/adapters/gcp.adoc

@@ -0,0 +1,3 @@
+*{spring-cloud-function-version}*
+
+include::adapters/gcp-intro.adoc[]

docs/src/main/asciidoc/index.adoc

@@ -11,6 +11,7 @@ The reference documentation consists of the following sections:
 <<spring-cloud-function.adoc#,Reference Guide>> :: Spring Cloud Function Reference
 <<aws.adoc#,AWS Adapter>> :: AWS Adapter Reference
 <<azure.adoc#, Azure Adapter>> :: Azure Adapter Reference
+<<gcp.adoc#, GCP Adapter>> :: GCP Adapter Reference
 <<openwhisk.adoc#, Apache OpenWhisk Adapter>> :: Apache OpenWhisk Adapter Reference
 
 

docs/src/main/asciidoc/spring-cloud-function.adoc

@@ -585,4 +585,5 @@ Invoker] acts natively is an adapter for Spring Cloud Function jars.
 
 include::adapters/aws-intro.adoc[]
 include::adapters/azure-intro.adoc[]
+include::adapters/gcp-intro.adoc[]
 

spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/pom.xml

@@ -17,14 +17,15 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<google.cloud.functions.version>1.0.0-alpha-2-rc3</google.cloud.functions.version>
+		<google.cloud.functions.api.version>1.0.0-alpha-2-rc3</google.cloud.functions.api.version>
+		<google.cloud.functions.invoker.version>1.0.0-alpha-2-rc4</google.cloud.functions.invoker.version>
 	</properties>
 
 	<dependencies>
 		<dependency>
 			<groupId>com.google.cloud.functions</groupId>
 			<artifactId>functions-framework-api</artifactId>
-			<version>${google.cloud.functions.version}</version>
+			<version>${google.cloud.functions.api.version}</version>
 			<scope>provided</scope>
 		</dependency>
 		<dependency>
@@ -44,7 +45,7 @@
 		<dependency>
 			<groupId>com.google.cloud.functions.invoker</groupId>
 			<artifactId>java-function-invoker</artifactId>
-			<version>${google.cloud.functions.version}</version>
+			<version>${google.cloud.functions.invoker.version}</version>
 			<scope>test</scope>
 		</dependency>
 	</dependencies>

spring-cloud-function-adapters/spring-cloud-function-adapter-gcp/src/main/java/org/springframework/cloud/function/adapter/gcloud/FunctionInvoker.java

@@ -46,13 +46,18 @@ public class FunctionInvoker
 
 	public FunctionInvoker() {
 		super();
+		init();
 	}
 
 	public FunctionInvoker(Class<?> configurationClass) {
 		super(configurationClass);
+		init();
+	}
+
+	private void init() {
 		System.setProperty("spring.http.converters.preferred-json-mapper", "gson");
-		Thread.currentThread() //TODO investigate if it is necessary
+		Thread.currentThread() // TODO: remove after upgrading to 1.0.0-alpha-2-rc5
-			.setContextClassLoader(FunctionInvoker.class.getClassLoader());
+				.setContextClassLoader(FunctionInvoker.class.getClassLoader());
 		initialize(null);
 	}
 

spring-cloud-function-samples/function-sample-gcp/README.adoc

@@ -0,0 +1,49 @@
+:branch: master
+
+=== Google Cloud Functions Sample Application
+
+===== Test locally
+
+Run the function:
+
+----
+mvn function:run
+----
+
+Invoke the HTTP function:
+
+----
+curl http://localhost:8080/ -d "hello"
+----
+
+===== Deploy to GCP
+
+As of March 2020, Google Cloud Functions for Java is in Alpha.
+You can get on the https://docs.google.com/forms/d/e/1FAIpQLScC98jGi7CfG0n3UYlj7Xad8XScvZC8-BBOg7Pk3uSZx_2cdQ/viewform[whitelist] to try it out.
+
+Package the application.
+
+----
+mvn package
+----
+
+You should see the fat jar in the `deploy` directory.
+
+Make sure that you have the https://cloud.google.com/sdk/install[Cloud SDK CLI] installed.
+
+Run the following command from the project root to deploy.
+
+----
+gcloud alpha functions deploy function-sample-gcp \
+--entry-point org.springframework.cloud.function.adapter.gcloud.FunctionInvoker \
+--runtime java11 \
+--trigger-http \
+--source deploy \
+--memory 512MB
+----
+
+Invoke the HTTP function:
+
+----
+curl https://REGION-PROJECT_ID.cloudfunctions.net/function-sample-gcp -d "hello"
+----

spring-cloud-function-samples/function-sample-gcp/pom.xml

@@ -27,7 +27,7 @@
 				<artifactId>function-maven-plugin</artifactId>
 				<version>0.9.1</version>
 				<configuration>
-					<functionTarget>org.springframework.cloud.function.adapter.gcloud.GcfSpringBootHttpRequestHandler</functionTarget>
+					<functionTarget>org.springframework.cloud.function.adapter.gcloud.FunctionInvoker</functionTarget>
 					<port>8080</port>
 				</configuration>
 			</plugin>