[Feature/agent_framework] Add Undeploy Model Step

src/main/java/org/opensearch/flowframework/common/CommonValue.java

@@ -73,6 +73,8 @@ private CommonValue() {}
     /** The provision workflow thread pool name */
     public static final String PROVISION_THREAD_POOL = "opensearch_workflow_provision";
 
+    /** Success name field */
+    public static final String SUCCESS = "success";
     /** Index name field */
     public static final String INDEX_NAME = "index_name";
     /** Type field */

src/main/java/org/opensearch/flowframework/workflow/UndeployModelStep.java

@@ -0,0 +1,114 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+package org.opensearch.flowframework.workflow;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.opensearch.ExceptionsHelper;
+import org.opensearch.OpenSearchException;
+import org.opensearch.action.FailedNodeException;
+import org.opensearch.core.action.ActionListener;
+import org.opensearch.flowframework.exception.FlowFrameworkException;
+import org.opensearch.flowframework.util.ParseUtils;
+import org.opensearch.ml.client.MachineLearningNodeClient;
+import org.opensearch.ml.common.transport.undeploy.MLUndeployModelsResponse;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+import java.util.stream.Collectors;
+
+import static org.opensearch.flowframework.common.CommonValue.MODEL_ID;
+import static org.opensearch.flowframework.common.CommonValue.SUCCESS;
+
+/**
+ * Step to undeploy model
+ */
+public class UndeployModelStep implements WorkflowStep {
+
+    private static final Logger logger = LogManager.getLogger(UndeployModelStep.class);
+
+    private MachineLearningNodeClient mlClient;
+
+    static final String NAME = "undeploy_model";
+
+    /**
+     * Instantiate this class
+     * @param mlClient Machine Learning client to perform the undeploy
+     */
+    public UndeployModelStep(MachineLearningNodeClient mlClient) {
+        this.mlClient = mlClient;
+    }
+
+    @Override
+    public CompletableFuture<WorkflowData> execute(
+        String currentNodeId,
+        WorkflowData currentNodeInputs,
+        Map<String, WorkflowData> outputs,
+        Map<String, String> previousNodeInputs
+    ) throws IOException {
+        CompletableFuture<WorkflowData> undeployModelFuture = new CompletableFuture<>();
+
+        ActionListener<MLUndeployModelsResponse> actionListener = new ActionListener<>() {
+
+            @Override
+            public void onResponse(MLUndeployModelsResponse mlUndeployModelsResponse) {
+                List<FailedNodeException> failures = mlUndeployModelsResponse.getResponse().failures();
+                if (failures.isEmpty()) {
+                    undeployModelFuture.complete(
+                        new WorkflowData(
+                            Map.ofEntries(Map.entry(SUCCESS, !mlUndeployModelsResponse.getResponse().hasFailures())),
+                            currentNodeInputs.getWorkflowId(),
+                            currentNodeInputs.getNodeId()
+                        )
+                    );
+                } else {
+                    List<String> failedNodes = failures.stream().map(FailedNodeException::nodeId).collect(Collectors.toList());
+                    String message = "Failed to undeploy model on nodes " + failedNodes;
+                    logger.error(message);
+                    undeployModelFuture.completeExceptionally(new OpenSearchException(message));
+                }
+            }
+
+            @Override
+            public void onFailure(Exception e) {
+                logger.error("Failed to unldeploy model");
+                undeployModelFuture.completeExceptionally(new FlowFrameworkException(e.getMessage(), ExceptionsHelper.status(e)));
+            }
+        };
+
+        Set<String> requiredKeys = Set.of(MODEL_ID);
+        Set<String> optionalKeys = Collections.emptySet();
+
+        try {
+            Map<String, Object> inputs = ParseUtils.getInputsFromPreviousSteps(
+                requiredKeys,
+                optionalKeys,
+                currentNodeInputs,
+                outputs,
+                previousNodeInputs
+            );
+
+            String modelId = inputs.get(MODEL_ID).toString();
+
+            mlClient.undeploy(new String[] { modelId }, null, actionListener);
+        } catch (FlowFrameworkException e) {
+            undeployModelFuture.completeExceptionally(e);
+        }
+        return undeployModelFuture;
+    }
+
+    @Override
+    public String getName() {
+        return NAME;
+    }
+}

src/main/java/org/opensearch/flowframework/workflow/WorkflowStepFactory.java

@@ -51,6 +51,7 @@ public WorkflowStepFactory(
         );
         stepMap.put(RegisterRemoteModelStep.NAME, new RegisterRemoteModelStep(mlClient, flowFrameworkIndicesHandler));
         stepMap.put(DeployModelStep.NAME, new DeployModelStep(mlClient));
+        stepMap.put(UndeployModelStep.NAME, new UndeployModelStep(mlClient));
         stepMap.put(CreateConnectorStep.NAME, new CreateConnectorStep(mlClient, flowFrameworkIndicesHandler));
         stepMap.put(DeleteConnectorStep.NAME, new DeleteConnectorStep(mlClient));
         stepMap.put(ModelGroupStep.NAME, new ModelGroupStep(mlClient, flowFrameworkIndicesHandler));

src/main/resources/mappings/workflow-steps.json

@@ -83,6 +83,14 @@
             "deploy_model_status"
         ]
     },
+    "undeploy_model": {
+        "inputs":[
+            "model_id"
+        ],
+        "outputs":[
+            "success"
+        ]
+    },
     "register_model_group": {
         "inputs":[
             "name"

src/test/java/org/opensearch/flowframework/workflow/UndeployModelStepTests.java

@@ -0,0 +1,131 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+package org.opensearch.flowframework.workflow;
+
+import org.opensearch.OpenSearchException;
+import org.opensearch.action.FailedNodeException;
+import org.opensearch.cluster.ClusterName;
+import org.opensearch.core.action.ActionListener;
+import org.opensearch.core.rest.RestStatus;
+import org.opensearch.flowframework.exception.FlowFrameworkException;
+import org.opensearch.ml.client.MachineLearningNodeClient;
+import org.opensearch.ml.common.transport.undeploy.MLUndeployModelNodesResponse;
+import org.opensearch.ml.common.transport.undeploy.MLUndeployModelsResponse;
+import org.opensearch.test.OpenSearchTestCase;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import static org.opensearch.flowframework.common.CommonValue.MODEL_ID;
+import static org.opensearch.flowframework.common.CommonValue.SUCCESS;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.verify;
+
+public class UndeployModelStepTests extends OpenSearchTestCase {
+    private WorkflowData inputData;
+
+    @Mock
+    MachineLearningNodeClient machineLearningNodeClient;
+
+    @Override
+    public void setUp() throws Exception {
+        super.setUp();
+
+        MockitoAnnotations.openMocks(this);
+
+        inputData = new WorkflowData(Collections.emptyMap(), "test-id", "test-node-id");
+    }
+
+    public void testUndeployModel() throws IOException, ExecutionException, InterruptedException {
+
+        String modelId = randomAlphaOfLength(5);
+        UndeployModelStep UndeployModelStep = new UndeployModelStep(machineLearningNodeClient);
+
+        doAnswer(invocation -> {
+            ClusterName clusterName = new ClusterName("clusterName");
+            ActionListener<MLUndeployModelsResponse> actionListener = invocation.getArgument(2);
+            MLUndeployModelNodesResponse mlUndeployModelNodesResponse = new MLUndeployModelNodesResponse(
+                clusterName,
+                Collections.emptyList(),
+                Collections.emptyList()
+            );
+            MLUndeployModelsResponse output = new MLUndeployModelsResponse(mlUndeployModelNodesResponse);
+            actionListener.onResponse(output);
+            return null;
+        }).when(machineLearningNodeClient).undeploy(any(String[].class), any(), any());
+
+        CompletableFuture<WorkflowData> future = UndeployModelStep.execute(
+            inputData.getNodeId(),
+            inputData,
+            Map.of("step_1", new WorkflowData(Map.of(MODEL_ID, modelId), "workflowId", "nodeId")),
+            Map.of("step_1", MODEL_ID)
+        );
+        verify(machineLearningNodeClient).undeploy(any(String[].class), any(), any());
+
+        assertTrue(future.isDone());
+        assertTrue((boolean) future.get().getContent().get(SUCCESS));
+    }
+
+    public void testNoModelIdInOutput() throws IOException {
+        UndeployModelStep UndeployModelStep = new UndeployModelStep(machineLearningNodeClient);
+
+        CompletableFuture<WorkflowData> future = UndeployModelStep.execute(
+            inputData.getNodeId(),
+            inputData,
+            Collections.emptyMap(),
+            Collections.emptyMap()
+        );
+
+        assertTrue(future.isCompletedExceptionally());
+        ExecutionException ex = assertThrows(ExecutionException.class, () -> future.get().getContent());
+        assertTrue(ex.getCause() instanceof FlowFrameworkException);
+        assertEquals("Missing required inputs [model_id] in workflow [test-id] node [test-node-id]", ex.getCause().getMessage());
+    }
+
+    public void testUndeployModelFailure() throws IOException {
+        UndeployModelStep UndeployModelStep = new UndeployModelStep(machineLearningNodeClient);
+
+        doAnswer(invocation -> {
+            ClusterName clusterName = new ClusterName("clusterName");
+            ActionListener<MLUndeployModelsResponse> actionListener = invocation.getArgument(2);
+            MLUndeployModelNodesResponse mlUndeployModelNodesResponse = new MLUndeployModelNodesResponse(
+                clusterName,
+                Collections.emptyList(),
+                List.of(new FailedNodeException("failed-node", "Test message", null))
+            );
+            MLUndeployModelsResponse output = new MLUndeployModelsResponse(mlUndeployModelNodesResponse);
+            actionListener.onResponse(output);
+
+            actionListener.onFailure(new FlowFrameworkException("Failed to undeploy model", RestStatus.INTERNAL_SERVER_ERROR));
+            return null;
+        }).when(machineLearningNodeClient).undeploy(any(String[].class), any(), any());
+
+        CompletableFuture<WorkflowData> future = UndeployModelStep.execute(
+            inputData.getNodeId(),
+            inputData,
+            Map.of("step_1", new WorkflowData(Map.of(MODEL_ID, "test"), "workflowId", "nodeId")),
+            Map.of("step_1", MODEL_ID)
+        );
+
+        verify(machineLearningNodeClient).undeploy(any(String[].class), any(), any());
+
+        assertTrue(future.isCompletedExceptionally());
+        ExecutionException ex = assertThrows(ExecutionException.class, () -> future.get().getContent());
+        assertTrue(ex.getCause() instanceof OpenSearchException);
+        assertEquals("Failed to undeploy model on nodes [failed-node]", ex.getCause().getMessage());
+    }
+}