Automatic version detection. Log details.

src/main/java/com/mabl/integration/jenkins/MablStepConstants.java

@@ -1,14 +1,20 @@
 package com.mabl.integration.jenkins;
 
+import java.io.IOException;
+import java.net.URL;
+import java.util.Enumeration;
+import java.util.jar.Manifest;
+
 /**
  * mabl custom build step
- *
  */
 class MablStepConstants {
     static final String PLUGIN_SYMBOL = "mabl";
-    static final String MABL_PLUGIN_NAME = "mabl-integration-plugin";
-    private static final String PLUGIN_VERSION = "0.4.0"; // TODO automatically set this from Maven
-    static final String PLUGIN_USER_AGENT = "mabl-jenkins-plugin/"+PLUGIN_VERSION;
+    static final String PLUGIN_NAME = "mabl-integration-plugin";
+    private static final String PLUGIN_ARTIFACT_NAME = "mabl-integration";
+    static final String PLUGIN_VERSION = getPluginVersion();
+    static final String PLUGIN_VERSION_UNKNOWN = "unknown";
+    static final String PLUGIN_USER_AGENT = "mabl-jenkins-plugin/" + PLUGIN_VERSION;
 
     // Label for build steps drop down list
     static final String BUILD_STEP_DISPLAY_NAME = "Run mabl journeys";
@@ -17,4 +23,26 @@ class MablStepConstants {
     static final int EXECUTION_TIMEOUT_SECONDS = 3600;
     static final int REQUEST_TIMEOUT_MILLISECONDS = 60000;
     static final long EXECUTION_STATUS_POLLING_INTERNAL_MILLISECONDS = 10000;
+
+
+    /**
+     * Dynamically grab the plugin version, so we can't forget to update it on release.
+     *
+     * @return plugin version, or {@link #PLUGIN_VERSION_UNKNOWN} on error/missing.
+     */
+    static String getPluginVersion() {
+        try {
+            final Enumeration<URL> resources = MablStepConstants.class.getClassLoader().getResources("META-INF/MANIFEST.MF");
+            while (resources.hasMoreElements()) {
+                final Manifest manifest = new Manifest(resources.nextElement().openStream());
+
+                String title = manifest.getMainAttributes().getValue("Implementation-title");
+                if (PLUGIN_ARTIFACT_NAME.equalsIgnoreCase(title)) {
+                    final String version = manifest.getMainAttributes().getValue("Implementation-Version");
+                    return version != null && !version.isEmpty() ? version : PLUGIN_VERSION_UNKNOWN;
+                }
+            }
+        } catch (IOException ignored) {}
+        return PLUGIN_VERSION_UNKNOWN;
+    }
 }

src/main/java/com/mabl/integration/jenkins/MablStepDeploymentRunner.java

@@ -10,7 +10,8 @@
 import java.util.Set;
 import java.util.concurrent.Callable;
 
-import static com.mabl.integration.jenkins.MablStepConstants.MABL_PLUGIN_NAME;
+import static com.mabl.integration.jenkins.MablStepConstants.PLUGIN_NAME;
+import static com.mabl.integration.jenkins.MablStepConstants.PLUGIN_VERSION;
 
 /**
  * mabl runner to launch all plans for a given
@@ -61,7 +62,7 @@ public MablStepDeploymentRunner(
     @Override
     public Boolean call() {
         try {
-            outputStream.print("\nmabl Jenkins plugging running...\n");
+            outputStream.printf("\nmabl Jenkins plugin v%s running...\n", PLUGIN_VERSION);
             execute();
             return true;
 
@@ -74,7 +75,7 @@ public Boolean call() {
             return continueOnPlanFailure;
 
         } catch (Exception e) {
-            outputStream.printf("Unexpected %s exception\n", MABL_PLUGIN_NAME);
+            outputStream.printf("Unexpected %s exception\n", PLUGIN_NAME);
             e.printStackTrace(outputStream);
             return continueOnMablError;
         }

src/test/java/com/mabl/integration/jenkins/MablConstantsTest.java

@@ -0,0 +1,22 @@
+package com.mabl.integration.jenkins;
+
+import org.junit.Test;
+
+import static com.mabl.integration.jenkins.MablStepConstants.PLUGIN_VERSION_UNKNOWN;
+import static com.mabl.integration.jenkins.MablStepConstants.getPluginVersion;
+import static junit.framework.TestCase.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+/**
+ * Unit test runner
+ */
+public class MablConstantsTest {
+
+    @Test
+    // Note: Doesn't run in junit because manifest injected at packaging")
+    public void ensurePluginVersionUnavailable() {
+        final String pluginVersion = getPluginVersion();
+        assertNotNull("plugin version unavailable", pluginVersion);
+        assertEquals("plugin version unavailable", pluginVersion, PLUGIN_VERSION_UNKNOWN);
+    }
+}