Adding a get status API

src/main/java/org/opensearch/flowframework/FlowFrameworkPlugin.java

@@ -28,10 +28,13 @@
 import org.opensearch.flowframework.common.FlowFrameworkFeatureEnabledSetting;
 import org.opensearch.flowframework.indices.FlowFrameworkIndicesHandler;
 import org.opensearch.flowframework.rest.RestCreateWorkflowAction;
+import org.opensearch.flowframework.rest.RestGetWorkflowAction;
 import org.opensearch.flowframework.rest.RestProvisionWorkflowAction;
 import org.opensearch.flowframework.rest.RestSearchWorkflowAction;
 import org.opensearch.flowframework.transport.CreateWorkflowAction;
 import org.opensearch.flowframework.transport.CreateWorkflowTransportAction;
+import org.opensearch.flowframework.transport.GetWorkflowAction;
+import org.opensearch.flowframework.transport.GetWorkflowTransportAction;
 import org.opensearch.flowframework.transport.ProvisionWorkflowAction;
 import org.opensearch.flowframework.transport.ProvisionWorkflowTransportAction;
 import org.opensearch.flowframework.transport.SearchWorkflowAction;
@@ -92,10 +95,9 @@ public Collection<Object> createComponents(
         flowFrameworkFeatureEnabledSetting = new FlowFrameworkFeatureEnabledSetting(clusterService, settings);
 
         MachineLearningNodeClient mlClient = new MachineLearningNodeClient(client);
-        WorkflowStepFactory workflowStepFactory = new WorkflowStepFactory(clusterService, client, mlClient);
-        WorkflowProcessSorter workflowProcessSorter = new WorkflowProcessSorter(workflowStepFactory, threadPool);
-
         FlowFrameworkIndicesHandler flowFrameworkIndicesHandler = new FlowFrameworkIndicesHandler(client, clusterService);
+        WorkflowStepFactory workflowStepFactory = new WorkflowStepFactory(clusterService, client, mlClient, flowFrameworkIndicesHandler);
+        WorkflowProcessSorter workflowProcessSorter = new WorkflowProcessSorter(workflowStepFactory, threadPool);
 
         return ImmutableList.of(workflowStepFactory, workflowProcessSorter, flowFrameworkIndicesHandler);
     }
@@ -113,7 +115,8 @@ public List<RestHandler> getRestHandlers(
         return ImmutableList.of(
             new RestCreateWorkflowAction(flowFrameworkFeatureEnabledSetting, settings, clusterService),
             new RestProvisionWorkflowAction(flowFrameworkFeatureEnabledSetting),
-            new RestSearchWorkflowAction(flowFrameworkFeatureEnabledSetting)
+            new RestSearchWorkflowAction(flowFrameworkFeatureEnabledSetting),
+            new RestGetWorkflowAction(flowFrameworkFeatureEnabledSetting)
         );
     }
 
@@ -122,7 +125,8 @@ public List<RestHandler> getRestHandlers(
         return ImmutableList.of(
             new ActionHandler<>(CreateWorkflowAction.INSTANCE, CreateWorkflowTransportAction.class),
             new ActionHandler<>(ProvisionWorkflowAction.INSTANCE, ProvisionWorkflowTransportAction.class),
-            new ActionHandler<>(SearchWorkflowAction.INSTANCE, SearchWorkflowTransportAction.class)
+            new ActionHandler<>(SearchWorkflowAction.INSTANCE, SearchWorkflowTransportAction.class),
+            new ActionHandler<>(GetWorkflowAction.INSTANCE, GetWorkflowTransportAction.class)
         );
     }
 

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

@@ -46,7 +46,7 @@ private CommonValue() {}
     public static final String USER_FIELD = "user";
 
     /** The transport action name prefix */
-    public static final String TRANSPORT_ACION_NAME_PREFIX = "cluster:admin/opensearch/flow_framework/";
+    public static final String TRANSPORT_ACTION_NAME_PREFIX = "cluster:admin/opensearch/flow_framework/";
     /** The base URI for this plugin's rest actions */
     public static final String FLOW_FRAMEWORK_BASE_URI = "/_plugins/_flow_framework";
     /** The URI for this plugin's workflow rest actions */
@@ -148,4 +148,9 @@ private CommonValue() {}
     public static final String USER_OUTPUTS_FIELD = "user_outputs";
     /** The template field name for template resources created */
     public static final String RESOURCES_CREATED_FIELD = "resources_created";
+    /** The field name for the ResourceCreated's resource ID */
+    public static final String RESOURCE_ID_FIELD = "resource_id";
+    /** The field name for the ResourceCreated's resource name */
+    public static final String WORKFLOW_STEP_NAME = "workflow_step_name";
+
 }

src/main/java/org/opensearch/flowframework/indices/FlowFrameworkIndicesHandler.java

@@ -38,6 +38,7 @@
 import org.opensearch.flowframework.model.State;
 import org.opensearch.flowframework.model.Template;
 import org.opensearch.flowframework.model.WorkflowState;
+import org.opensearch.script.Script;
 
 import java.io.IOException;
 import java.net.URL;
@@ -311,7 +312,7 @@ public void putInitialStateToWorkflowState(String workflowId, User user, ActionL
             .state(State.NOT_STARTED.name())
             .provisioningProgress(ProvisioningProgress.NOT_STARTED.name())
             .user(user)
-            .resourcesCreated(Collections.emptyMap())
+            .resourcesCreated(Collections.emptyList())
             .userOutputs(Collections.emptyMap())
             .build();
         initWorkflowStateIndexIfAbsent(ActionListener.wrap(indexCreated -> {
@@ -402,4 +403,38 @@ public void updateFlowFrameworkSystemIndexDoc(
             }
         }
     }
+
+    /**
+     * Updates a document in the workflow state index
+     * @param indexName the index that we will be updating a document of.
+     * @param documentId the document ID
+     * @param script the given script to update doc
+     * @param listener action listener
+     */
+    public void updateFlowFrameworkSystemIndexDocWithScript(
+        String indexName,
+        String documentId,
+        Script script,
+        ActionListener<UpdateResponse> listener
+    ) {
+        if (!doesIndexExist(indexName)) {
+            String exceptionMessage = "Failed to update document for given workflow due to missing " + indexName + " index";
+            logger.error(exceptionMessage);
+            listener.onFailure(new Exception(exceptionMessage));
+        } else {
+            try (ThreadContext.StoredContext context = client.threadPool().getThreadContext().stashContext()) {
+                UpdateRequest updateRequest = new UpdateRequest(indexName, documentId);
+                // TODO: Also add ability to change other fields at the same time when adding detailed provision progress
+                updateRequest.script(script);
+                updateRequest.setRefreshPolicy(WriteRequest.RefreshPolicy.IMMEDIATE);
+                // TODO: decide what condition can be considered as an update conflict and add retry strategy
+                client.update(updateRequest, ActionListener.runBefore(listener, () -> context.restore()));
+            } catch (Exception e) {
+                logger.error("Failed to update {} entry : {}. {}", indexName, documentId, e.getMessage());
+                listener.onFailure(
+                    new FlowFrameworkException("Failed to update " + indexName + "entry: " + documentId, ExceptionsHelper.status(e))
+                );
+            }
+        }
+    }
 }

src/main/java/org/opensearch/flowframework/model/ProvisioningProgress.java

@@ -18,5 +18,7 @@ public enum ProvisioningProgress {
     /** In Progress State */
     IN_PROGRESS,
     /** Done State */
-    DONE
+    DONE,
+    /** Failed State */
+    FAILED
 }

src/main/java/org/opensearch/flowframework/model/ResourceCreated.java

@@ -0,0 +1,123 @@
+/*
+ * 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.model;
+
+import org.opensearch.core.common.io.stream.StreamInput;
+import org.opensearch.core.common.io.stream.StreamOutput;
+import org.opensearch.core.common.io.stream.Writeable;
+import org.opensearch.core.xcontent.ToXContentObject;
+import org.opensearch.core.xcontent.XContentBuilder;
+import org.opensearch.core.xcontent.XContentParser;
+
+import java.io.IOException;
+
+import static org.opensearch.core.xcontent.XContentParserUtils.ensureExpectedToken;
+import static org.opensearch.flowframework.common.CommonValue.RESOURCE_ID_FIELD;
+import static org.opensearch.flowframework.common.CommonValue.WORKFLOW_STEP_NAME;
+
+/**
+ * This represents an object in the WorkflowState {@link WorkflowState}.
+ */
+// TODO: create an enum to add the resource name itself for each step example (create_connector_step -> connector)
+public class ResourceCreated implements ToXContentObject, Writeable {
+
+    private final String workflowStepName;
+    private final String resourceId;
+
+    /**
+     * Create this resources created object with given resource name and ID.
+     * @param workflowStepName The workflow step name associating to the step where it was created
+     * @param resourceId The resources ID for relating to the created resource
+     */
+    public ResourceCreated(String workflowStepName, String resourceId) {
+        this.workflowStepName = workflowStepName;
+        this.resourceId = resourceId;
+    }
+
+    /**
+     * Create this resources created object with an StreamInput
+     * @param input the input stream to read from
+     * @throws IOException if failed to read input stream
+     */
+    public ResourceCreated(StreamInput input) throws IOException {
+        this.workflowStepName = input.readString();
+        this.resourceId = input.readString();
+    }
+
+    @Override
+    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
+        XContentBuilder xContentBuilder = builder.startObject()
+            .field(WORKFLOW_STEP_NAME, workflowStepName)
+            .field(RESOURCE_ID_FIELD, resourceId);
+        return xContentBuilder.endObject();
+    }
+
+    @Override
+    public void writeTo(StreamOutput out) throws IOException {
+        out.writeString(workflowStepName);
+        out.writeString(resourceId);
+    }
+
+    /**
+     * Gets the resource id.
+     *
+     * @return the resourceId.
+     */
+    public String resourceId() {
+        return resourceId;
+    }
+
+    /**
+     * Gets the workflow step name associated to the created resource
+     *
+     * @return the workflowStepName.
+     */
+    public String workflowStepName() {
+        return workflowStepName;
+    }
+
+    /**
+     * Parse raw JSON content into a ResourceCreated instance.
+     *
+     * @param parser JSON based content parser
+     * @return the parsed ResourceCreated instance
+     * @throws IOException if content can't be parsed correctly
+     */
+    public static ResourceCreated parse(XContentParser parser) throws IOException {
+        String workflowStepName = null;
+        String resourceId = null;
+
+        ensureExpectedToken(XContentParser.Token.START_OBJECT, parser.currentToken(), parser);
+        while (parser.nextToken() != XContentParser.Token.END_OBJECT) {
+            String fieldName = parser.currentName();
+            parser.nextToken();
+
+            switch (fieldName) {
+                case WORKFLOW_STEP_NAME:
+                    workflowStepName = parser.text();
+                    break;
+                case RESOURCE_ID_FIELD:
+                    resourceId = parser.text();
+                    break;
+                default:
+                    throw new IOException("Unable to parse field [" + fieldName + "] in a resources_created object.");
+            }
+        }
+        if (workflowStepName == null || resourceId == null) {
+            throw new IOException("A ResourceCreated object requires both a workflowStepName and resourceId.");
+        }
+        return new ResourceCreated(workflowStepName, resourceId);
+    }
+
+    @Override
+    public String toString() {
+        return "resources_Created [resource_name=" + workflowStepName + ", id=" + resourceId + "]";
+    }
+
+}

src/main/java/org/opensearch/flowframework/model/Template.java

@@ -13,6 +13,8 @@
 import org.opensearch.common.xcontent.json.JsonXContent;
 import org.opensearch.common.xcontent.yaml.YamlXContent;
 import org.opensearch.commons.authuser.User;
+import org.opensearch.core.common.io.stream.StreamOutput;
+import org.opensearch.core.common.io.stream.Writeable;
 import org.opensearch.core.xcontent.NamedXContentRegistry;
 import org.opensearch.core.xcontent.ToXContentObject;
 import org.opensearch.core.xcontent.XContentBuilder;
@@ -39,7 +41,7 @@
 /**
  * The Template is the central data structure which configures workflows. This object is used to parse JSON communicated via REST API.
  */
-public class Template implements ToXContentObject {
+public class Template implements ToXContentObject, Writeable {
 
     private String name;
     private String description;
@@ -240,6 +242,23 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
         return xContentBuilder.endObject();
     }
 
+    // TODO: fix writeable when implementing get workflow API
+    @Override
+    public void writeTo(StreamOutput output) throws IOException {
+        output.writeString(name);
+        output.writeOptionalString(description);
+        output.writeString(useCase);
+        output.writeVersion(templateVersion);
+        // output.writeList((List<? extends Writeable>) compatibilityVersion);
+        output.writeMapWithConsistentOrder(workflows);
+        if (user != null) {
+            output.writeBoolean(true); // user exists
+            user.writeTo(output);
+        } else {
+            output.writeBoolean(false); // user does not exist
+        }
+    }
+
     /**
      * Parse raw json content into a Template instance.
      *