Add vert-x template

Based upon the existing java8/11 template and the work of @k33g

https://gitlab.com/openfaas-experiments/java-8-vert-x-template/

Tested by creating a new function with `faas-cli new` and then
running `faas-cli up` against a Kubernetes cluster with OpenFaaS.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

README.md

@@ -18,6 +18,7 @@ This repository contains the Classic OpenFaaS templates, but many more are avail
 | python | Python | 2.7 | Alpine Linux | classic | [Python 2.7 template](https://github.com/openfaas/templates/tree/master/template/python)
 | go | Go | 1.11 | Alpine Linux | classic | [Go template](https://github.com/openfaas/templates/tree/master/template/go)
 | csharp | C# | N/A | Debian GNU/Linux 9 | classic | [C# template](https://github.com/openfaas/templates/tree/master/template/csharp)
+| java11-vert-x | Java and [Vert.x](https://vertx.io/) | 11 | Debian GNU/Linux | of-watchdog | [Java LTS template](https://github.com/openfaas/templates/tree/master/template/java11)
 | java11 | Java | 11 | Debian GNU/Linux | of-watchdog | [Java LTS template](https://github.com/openfaas/templates/tree/master/template/java11)
 | java8 | Java | 8 | OpenJDK Alpine Linux | of-watchdog | [Java EOL template](https://github.com/openfaas/templates/tree/master/template/java8)
 | ruby | Ruby | 2.5.1 | Alpine Linux 3.7 | classic| [Ruby template](https://github.com/openfaas/templates/tree/master/template/ruby)

template/java11-vert-x/Dockerfile

@@ -0,0 +1,62 @@
+FROM openjdk:11-jdk-slim as builder
+
+ENV GRADLE_VER=6.1.1
+RUN apt-get update -qqy \
+  && apt-get install -qqy \
+   --no-install-recommends \
+   curl \
+   ca-certificates \
+   unzip
+
+RUN mkdir -p /opt/ && cd /opt/ \
+    && echo "Downloading gradle.." \
+    && curl -sSfL "https://services.gradle.org/distributions/gradle-${GRADLE_VER}-bin.zip" -o gradle-$GRADLE_VER-bin.zip \
+    && unzip gradle-$GRADLE_VER-bin.zip -d /opt/ \
+    && rm gradle-$GRADLE_VER-bin.zip
+
+# Export some environment variables
+ENV GRADLE_HOME=/opt/gradle-$GRADLE_VER/
+ENV PATH=$PATH:$GRADLE_HOME/bin
+
+RUN mkdir -p /home/app/libs
+
+ENV GRADLE_OPTS="-Dorg.gradle.daemon=false"
+WORKDIR /home/app
+
+COPY . /home/app/
+
+RUN gradle build
+RUN find . 
+
+FROM openfaas/of-watchdog:0.7.6 as watchdog
+FROM openjdk:11-jre-slim as ship
+RUN apt-get update -qqy \
+  && apt-get install -qqy \
+   --no-install-recommends \
+   unzip
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
+
+WORKDIR /home/app
+COPY --from=builder /home/app/entrypoint/build/distributions/entrypoint-1.0.zip ./entrypoint-1.0.zip
+RUN unzip ./entrypoint-1.0.zip
+
+RUN addgroup --system app \
+    && adduser --system --ingroup app app
+
+WORKDIR /home/app/
+RUN chown -R app /home/app
+
+USER app
+
+ENV upstream_url="http://127.0.0.1:8082"
+ENV mode="http"
+ENV CLASSPATH="/home/app/entrypoint-1.0/lib/*"
+
+ENV fprocess="java -XX:+UseContainerSupport com.openfaas.entrypoint.App"
+EXPOSE 8080
+
+HEALTHCHECK --interval=5s CMD [ -e /tmp/.lock ] || exit 1
+
+CMD ["fwatchdog"]

template/java11-vert-x/README.md

@@ -0,0 +1,58 @@
+## Template: java8-vert-x
+
+The Java8-Vert.x template uses gradle as a build system.
+
+Gradle version: 4.8.1
+
+### Structure
+
+There are two projects which make up a single gradle build:
+
+- function - (Library) your function code as a developer, you will only ever see this folder
+- entrypoint - (App) Vert.x HTTP server
+
+### Handler
+
+The handler is written in the `./src/main/java/com/openfaas/function/Handler.java` folder
+
+Tests are supported with junit via files in `./src/test`
+
+### External dependencies
+
+External dependencies can be specified in ./build.gradle in the normal way using jcenter, a local JAR or some other remote repository.
+
+### Serve a "pure" static html web application
+
+This template allow you to serve static html assets (eg: single page application)
+
+#### First, update your yaml deployment file:
+
+You only need to add to the `environment` key, a `FRONTAPP` variable (with a value set to `true`)
+
+```yaml
+environment:
+  FRONTAPP: true
+```
+
+#### Then add assets in the webroot directory
+
+Put your static assets in this directory: `/src/main/resources/webroot`
+
+> If `FRONTAPP` is set to `false` (or does not exist), it's the `Handler` instance that serves the data.
+
+
+#### Deployment yaml file sample:
+
+```yaml
+provider:
+  name: faas
+  gateway: http://openfaas.test:8080
+functions:
+  hello-vert-x:
+    lang: java8-vert-x
+    environment:
+      FRONTAPP: true
+    handler: ./function
+    image: registry.test:5000/hello-vert-x:latest
+```
+

template/java11-vert-x/build.gradle

@@ -0,0 +1,22 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This is a general purpose Gradle build.
+ * Learn how to create Gradle builds at https://guides.gradle.org/creating-new-gradle-builds/
+ */
+
+allprojects {
+    repositories {
+        jcenter() 
+    }
+}
+
+subprojects {
+    // apply plugin: 'java'
+
+    version = '1.0'
+
+    // jar {
+    //     manifest.attributes provider: 'gradle'
+    // }
+}

template/java11-vert-x/entrypoint/build.gradle

@@ -0,0 +1,51 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java project to get you started.
+ * For more details take a look at the Java Quickstart chapter in the Gradle
+ * user guide available at https://docs.gradle.org/4.8.1/userguide/tutorial_java_projects.html
+ */
+
+plugins {
+    // Apply the java plugin to add support for Java
+    id 'java'
+
+    // Apply the application plugin to add support for building an application
+    id 'application'
+
+}
+
+// Define the main class for the application
+mainClassName = 'App'
+
+dependencies {
+    // Vert.x project
+    compile 'io.vertx:vertx-web:3.5.4'
+
+    // Use JUnit test framework
+    testCompile 'junit:junit:4.12'
+
+    compile project(':function')
+}
+
+jar {
+    manifest {
+        attributes 'Implementation-Title': 'OpenFaaS Function',
+                   'Implementation-Version': version
+    }
+}
+
+// In this section you declare where to find the dependencies of your project
+repositories {
+    // Use jcenter for resolving your dependencies.
+    // You can declare any Maven/Ivy/file repository here.
+    jcenter()
+}
+
+uploadArchives {
+    repositories {
+       flatDir {
+           dirs 'repos'
+       }
+    }
+}

template/java11-vert-x/entrypoint/settings.gradle

@@ -0,0 +1,10 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ * 
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user guide at https://docs.gradle.org/4.8.1/userguide/multi_project_builds.html
+ */
+
+rootProject.name = 'entrypoint'

template/java11-vert-x/entrypoint/src/main/java/com/openfaas/entrypoint/App.java

@@ -0,0 +1,35 @@
+// Copyright (c) OpenFaaS Author(s) 2018. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+package com.openfaas.entrypoint;
+
+import io.vertx.core.http.HttpServer;
+import io.vertx.core.Vertx;
+import io.vertx.ext.web.Router;
+import io.vertx.ext.web.handler.StaticHandler;
+import io.vertx.ext.web.handler.BodyHandler;
+import java.util.Optional;
+
+public class App {
+  public static void main(String[] args) throws Exception {
+    Vertx vertx = Vertx.vertx();
+    Integer httpPort = Integer.parseInt(Optional.ofNullable(System.getenv("PORT")).orElse("8082"));
+    HttpServer server = vertx.createHttpServer();
+    Router router = Router.router(vertx);
+
+    if (Boolean.parseBoolean(Optional.ofNullable(System.getenv("FRONTAPP")).orElse("false"))) {
+      // serve static assets, see /resources/webroot directory
+      router.route("/*").handler(StaticHandler.create());
+    } else {
+      BodyHandler handler = new com.openfaas.function.Handler();
+      router.route().handler(handler);
+    }
+
+    server.requestHandler(router::accept).listen(httpPort, result -> {
+      if(result.succeeded()) {
+        System.out.println("Listening on port " + httpPort);
+      } else {
+        System.out.println("Unable to start server: " + result.cause().getMessage());
+      }
+    });
+  }
+}

template/java11-vert-x/entrypoint/src/test/java/AppTest.java

@@ -0,0 +1,3 @@
+public class AppTest {
+
+}

template/java11-vert-x/function/build.gradle

@@ -0,0 +1,27 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java Library project to get you started.
+ * For more details take a look at the Java Libraries chapter in the Gradle
+ * user guide available at https://docs.gradle.org/4.8.1/userguide/java_library_plugin.html
+ */
+
+plugins {
+    // Apply the java-library plugin to add support for Java Library
+    id 'java-library'
+}
+
+dependencies {
+    // Vert.x project
+    compile 'io.vertx:vertx-web:3.5.4'
+
+    // Use JUnit test framework
+    testImplementation 'junit:junit:4.12'    
+}
+
+// In this section you declare where to find the dependencies of your project
+repositories {
+    // Use jcenter for resolving your dependencies.
+    // You can declare any Maven/Ivy/file repository here.
+    jcenter()
+}

template/java11-vert-x/function/settings.gradle

@@ -0,0 +1,10 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ * 
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user guide at https://docs.gradle.org/4.8.1/userguide/multi_project_builds.html
+ */
+
+rootProject.name = 'function'

template/java11-vert-x/function/src/main/java/com/openfaas/function/Handler.java

@@ -0,0 +1,40 @@
+package com.openfaas.function;
+
+import io.vertx.core.http.HttpServerResponse;
+import io.vertx.ext.web.RoutingContext;
+import io.vertx.ext.web.handler.BodyHandler;
+import io.vertx.core.json.JsonObject;
+
+public class Handler implements BodyHandler {
+
+  @Override
+  public void handle(RoutingContext routingContext) {
+    routingContext.response()
+      .putHeader("content-type", "application/json;charset=UTF-8")
+      .end(
+        new JsonObject()
+          .put("status", "ok")
+          .encodePrettily()
+      );
+  }
+
+  @Override
+  public BodyHandler setBodyLimit(long bodyLimit) {
+    return null;
+  }
+
+  @Override
+  public BodyHandler setUploadsDirectory(String uploadsDirectory) {
+    return null;
+  }
+
+  @Override
+  public BodyHandler setMergeFormAttributes(boolean mergeFormAttributes) {
+    return null;
+  }
+
+  @Override
+  public BodyHandler setDeleteUploadedFilesOnEnd(boolean deleteUploadedFilesOnEnd) {
+    return null;
+  }
+}

template/java11-vert-x/function/src/main/resources/webroot/index.html

@@ -0,0 +1,55 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <meta http-equiv="x-ua-compatible" content="ie=edge">
+    <title>WebApp with Vert.x and Java</title>
+    <meta name="description" content="">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+
+    <style>
+    .container
+    {
+      min-height: 100vh;
+      display: flex;
+      justify-content: center;
+      align-items: center;
+      text-align: center;
+    }
+    .title
+    {
+      font-family: "Source Sans Pro", "Helvetica Neue", Arial, sans-serif;
+      display: block;
+      font-weight: 300;
+      font-size: 100px;
+      color: #35495e;
+      letter-spacing: 1px;
+    }
+    .subtitle
+    {
+      font-family: "Source Sans Pro", "Helvetica Neue", Arial, sans-serif;
+      font-weight: 300;
+      font-size: 42px;
+      color: #526488;
+      word-spacing: 5px;
+      padding-bottom: 15px;
+    }
+    .links
+    {
+      padding-top: 15px;
+    }
+    </style>
+  </head>
+  <body>
+    <section class="container">
+      <div>
+        <h1 class="title">
+          WebApp with Vert.x and Java
+        </h1>
+        <h2 class="subtitle">
+          Hosted with ❤️ on OpenFaaS
+        </h2>
+      </div>
+    </section>
+  </body>
+</html>