gradle plugin with a 'render' task, and example usage.

Signed-off-by: Matthieu Nottale <[email protected]>

Author: Matthieu Nottale

gradle/build.gradle

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+plugins {
+    id 'java'
+}
+
+plugins {
+    id 'java-gradle-plugin'
+}
+apply plugin: 'java-gradle-plugin'
+group 'docker'
+version '1.0-SNAPSHOT'
+
+sourceCompatibility = 1.8
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.12'
+}
+
+
+gradlePlugin {
+    plugins {
+        dockerapp {
+            id = 'com.docker.gradle.dockerapp'
+            implementationClass = 'com.docker.gradle.dockerapp.DockerAppPlugin'
+        }
+    }
+}

gradle/example/build.gradle

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+buildscript{
+    dependencies{
+        classpath files('../build/libs/dockerapp-plugin-1.0-SNAPSHOT.jar')
+    }
+}
+
+apply plugin: com.docker.gradle.dockerapp.DockerAppPlugin
+
+import com.docker.gradle.dockerapp.*
+
+task renderIt(type: DockerAppRender) {
+  appPath = 'simple'
+  target = 'rendered.yml'
+}

gradle/example/intelij-gradle-dockerapp.png

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+version: "3.6"
+services:
+  mysql:
+    image: mysql:${mysql.image.version}
+    environment:
+      MYSQL_ROOT_PASSWORD: ${mysql.rootpass}
+      MYSQL_DATABASE: ${mysql.database}
+      MYSQL_USER: ${mysql.user.name}
+      MYSQL_PASSWORD: ${mysql.user.password}
+    volumes:
+      - source: db_data
+        target: /var/lib/mysql
+        type: volume
+    deploy:
+      mode: replicated
+      replicas: 1
+  wordpress:
+    image: wordpress
+    environment:
+      WORDPRESS_DB_USER: ${mysql.user.name}
+      WORDPRESS_DB_PASSWORD: ${mysql.user.password}
+      WORDPRESS_DB_NAME: ${mysql.database}
+      WORDPRESS_DB_HOST: mysql
+      WORDPRESS_DEBUG: ${debug}
+    deploy:
+      mode: ${wordpress.scale.mode}
+      replicas: ${wordpress.scale.replicas}
+
+volumes:
+  db_data:
+    name: ${volumes.db_data.name}

gradle/example/settings.gradle

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+version: 0.1.0
+name: simple
+description: ""
+maintainers:
+  - name: sakuya.izayoi
+    email: [email protected]
+targets:
+  swarm: true
+  kubernetes: true

gradle/example/simple.dockerapp/docker-compose.yml

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+debug: true
+mysql:
+  image:
+    version: 8
+  rootpass: axx[<^cz3d.fPb
+  database: wordpressdata
+  user:
+    name: wordpress
+    password: wordpress
+wordpress:
+  scale:
+    mode: global
+    replicas: 0
+volumes:
+  db_data:
+    name: db_data

gradle/example/simple.dockerapp/metadata.yml

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+rootProject.name = 'dockerapp-plugin'
+

gradle/example/simple.dockerapp/settings.yml

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+package com.docker.gradle.dockerapp;
+
+import org.gradle.api.*;
+
+public class DockerAppPlugin implements Plugin<Project> {
+  static final String TASK_NAME = "yourTask";
+
+  @Override
+  public void apply(Project target) {
+  }
+}

gradle/settings.gradle

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+package com.docker.gradle.dockerapp;
+
+import org.gradle.api.DefaultTask;
+import org.gradle.api.tasks.Input;
+import org.gradle.api.tasks.OutputFile;
+import org.gradle.api.tasks.TaskAction;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+
+public class DockerAppRender extends DefaultTask {
+    private String appPath;
+    private String target;
+    @OutputFile
+    public String GetTarget() {
+        return target;
+    }
+    public void setTarget(String t) {
+        target = t;
+    }
+    @Input
+    public String GetAppPath() {
+        return appPath;
+    }
+
+    public void setAppPath(String ap) {
+        appPath = ap;
+    }
+    @TaskAction
+    public void process() {
+        try {
+            Process p = Runtime.getRuntime().exec("docker-app " + "render " + appPath + " -o " + target);
+            BufferedReader input =
+                    new BufferedReader
+                            (new InputStreamReader(p.getInputStream()));
+            String line;
+            while ((line = input.readLine()) != null) {
+                System.out.println(line);
+            }
+            input.close();
+        } catch (Exception e) {
+             e.printStackTrace();
+        }
+    }
+}