Added support for programmatic update of a SlaveTemplate

README.md

@@ -483,6 +483,28 @@ jenkins.clouds.add(amazonEC2Cloud)
 jenkins.save()
 ```
 
+## Programmatically adding/updating CloudTemplates
+
+The plugin supports programmatic addition and update of `CloudTemplates` in an already existing `Cloud` - 
+both can be accomplished via the Jenkins script console [Jenkins script console](https://wiki.jenkins.io/display/JENKINS/Jenkins+Script+Console).
+
+Example:
+
+```java
+ // Assuming on the Jenkins instance, there exists an EC2Cloud with the name "AwsCloud"
+
+ AmazonEC2Cloud cloud = (AmazonEC2Cloud) Jenkins.get().clouds.stream().filter(cloud1 -> Objects.equals(cloud.getDisplayName(), "AwsCloud")).findFirst().get();
+
+ SlaveTemplate template = new SlaveTemplate(/*constructor*/); // View available constructors at https://github.com/jenkinsci/ec2-plugin/blob/master/src/main/java/hudson/plugins/ec2/SlaveTemplate.java
+
+ // Adding a template
+ cloud.addTemplate(template);
+
+ SlaveTemplate template2 = new SlaveTemplate(/*constructor*/);
+ // Updating a template. Note the description of an existing SlaveTemplate needs to passed in order for there to be a successful update, otherwise an Exception is thrown
+ cloud.updateTemplate(template2, template.description);
+```
+
 # Security
 ## Securing the connection to Unix AMIs
 When you set up a template for a *Unix* instance (`Type AMI` field), you can select the strategy used to guarantee the

src/main/java/hudson/plugins/ec2/EC2Cloud.java

@@ -87,16 +87,7 @@
 import java.net.MalformedURLException;
 import java.net.Proxy;
 import java.net.URL;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Date;
-import java.util.EnumSet;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Optional;
-import java.util.Set;
-import java.util.UUID;
+import java.util.*;
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.ReentrantLock;
@@ -226,6 +217,17 @@
         templates = templatesHolder;
     }
 
+    public void updateTemplate(SlaveTemplate newTemplate, String oldTemplateDescription) throws Exception{
+        Optional<? extends SlaveTemplate> optionalOldTemplate = templates.stream().filter(template ->
+                Objects.equals(template.description, oldTemplateDescription)).findFirst();
+        if (!optionalOldTemplate.isPresent())
+            throw new Exception(String.format("A SlaveTemplate with description %s does not exist", oldTemplateDescription));
+        int oldTemplateIndex = templates.indexOf(optionalOldTemplate.get());
+        List<SlaveTemplate> templatesHolder = new ArrayList<>(templates);
+        templatesHolder.set(oldTemplateIndex, newTemplate);
+        templates = templatesHolder;
+    }
+
     private void migratePrivateSshKeyToCredential(String privateKey) {
         // GET matching private key credential from Credential API if exists
         Optional<SSHUserPrivateKey> keyCredential = SystemCredentialsProvider.getInstance().getCredentials()

src/test/java/hudson/plugins/ec2/EC2CloudTest.java

@@ -6,6 +6,7 @@
 import com.amazonaws.services.ec2.model.InstanceType;
 import hudson.model.Node;
 import jenkins.model.Jenkins;
+import org.junit.Assert;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.MockedStatic;
@@ -19,8 +20,7 @@
 import java.util.Collections;
 import java.util.List;
 
-import static org.junit.Assert.assertArrayEquals;
-import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.*;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.times;
 
@@ -37,6 +37,24 @@ public void testSlaveTemplateAddition() throws Exception {
         assertNotNull(cloud.getTemplate(orig.description));
     }
 
+    @Test
+    public void testSlaveTemplateUpdate() throws Exception{
+        AmazonEC2Cloud cloud = new AmazonEC2Cloud("us-east-1", true,
+                "abc", "us-east-1", null, "ghi",
+                "3", Collections.emptyList(), "roleArn", "roleSessionName");
+        SlaveTemplate oldSlaveTemplate = new SlaveTemplate("ami-123", EC2AbstractSlave.TEST_ZONE, null, "default", "foo", InstanceType.M1Large, false, "ttt", Node.Mode.NORMAL, "OldSlaveDescription", "bar", "bbb", "aaa", "10", "fff", null, "-Xmx1g", false, "subnet 456", null, null, 0, 0, null, "iamInstanceProfile", true, false, "", false, "", false, false, false, ConnectionStrategy.PUBLIC_IP, -1, null, null, Tenancy.Default, EbsEncryptRootVolume.DEFAULT);
+        SlaveTemplate secondSlaveTemplate = new SlaveTemplate("ami-123", EC2AbstractSlave.TEST_ZONE, null, "default", "foo", InstanceType.M1Large, false, "ttt", Node.Mode.NORMAL, "SecondSlaveDescription", "bar", "bbb", "aaa", "10", "fff", null, "-Xmx1g", false, "subnet 456", null, null, 0, 0, null, "iamInstanceProfile", true, false, "", false, "", false, false, false, ConnectionStrategy.PUBLIC_IP, -1, null, null, Tenancy.Default, EbsEncryptRootVolume.DEFAULT);
+        cloud.addTemplate(oldSlaveTemplate);
+        cloud.addTemplate(secondSlaveTemplate);
+        SlaveTemplate newSlaveTemplate = new SlaveTemplate("ami-456", EC2AbstractSlave.TEST_ZONE, null, "default", "foo", InstanceType.M1Large, false, "ttt", Node.Mode.NORMAL, "NewSlaveDescription", "bar", "bbb", "aaa", "10", "fff", null, "-Xmx1g", false, "subnet 456", null, null, 0, 0, null, "iamInstanceProfile", true, false, "", false, "", false, false, false, ConnectionStrategy.PUBLIC_IP, -1, null, null, Tenancy.Default, EbsEncryptRootVolume.DEFAULT);
+        int index = cloud.getTemplates().indexOf(oldSlaveTemplate);
+
+        cloud.updateTemplate(newSlaveTemplate, "OldSlaveDescription");
+        assertNull(cloud.getTemplate("OldSlaveDescription"));
+        assertNotNull(cloud.getTemplate("NewSlaveDescription"));
+        Assert.assertEquals(index, cloud.getTemplates().indexOf(newSlaveTemplate)); // assert order of templates is kept
+    }
+
     @Test
     public void testReattachOrphanStoppedNodes() throws Exception {
         /* Mocked items */