Infer managedServiceSourceSnapshotEnabled when not set

deployment/cdk/opensearch-service-migration/lib/stack-composer.ts

@@ -214,7 +214,7 @@ export class StackComposer {
         const reindexFromSnapshotMaxShardSizeGiB = this.getContextForType('reindexFromSnapshotMaxShardSizeGiB', 'number', defaultValues, contextJSON)
         const reindexFromSnapshotWorkerSize = this.getContextForType('reindexFromSnapshotWorkerSize', 'string', defaultValues, contextJSON)
         const albAcmCertArn = this.getContextForType('albAcmCertArn', 'string', defaultValues, contextJSON);
-        const managedServiceSourceSnapshotEnabled = this.getContextForType('managedServiceSourceSnapshotEnabled', 'boolean', defaultValues, contextJSON)
+        let managedServiceSourceSnapshotEnabled = this.getContextForType('managedServiceSourceSnapshotEnabled', 'boolean', defaultValues, contextJSON)
 
         // We're in a transition state from an older model with limited, individually defined fields and heading towards objects
         // that fully define the source and target cluster configurations. For the time being, we're supporting both.
@@ -245,6 +245,9 @@ export class StackComposer {
         if (managedServiceSourceSnapshotEnabled && !sourceCluster?.auth.sigv4) {
             throw new Error("A managed service source snapshot is only compatible with sigv4 authentication. If you would like to proceed" +
                 " please disable `managedServiceSourceSnapshotEnabled` and provide your own snapshot of the source cluster.")
+        } else if (sourceCluster?.auth.sigv4 && managedServiceSourceSnapshotEnabled == null) {
+            managedServiceSourceSnapshotEnabled = true;
+            CdkLogger.info("`managedServiceSourceSnapshotEnabled` is not set with source cluster set with sigv4 auth, defaulting to true.")
         }
 
         const targetClusterEndpointField = this.getContextForType('targetClusterEndpoint', 'string', defaultValues, contextJSON)

deployment/cdk/opensearch-service-migration/options.md

@@ -56,7 +56,7 @@ In all other cases, the required components of each cluster object are:
 | reindexFromSnapshotServiceEnabled   | boolean | true                                                                 | Create resources for deploying and configuring the RFS ECS service                                                                                                         |
 | reindexFromSnapshotExtraArgs        | string  | "--target-aws-region us-east-1 --target-aws-service-signing-name es" | Extra arguments to provide to the Document Migration command with space separation. See [RFS Arguments](../../../DocumentsFromSnapshotMigration/README.md#Arguments). [^1] |
 | sourceClusterEndpoint               | string  | `"https://source-cluster.elb.us-east-1.endpoint.com"`                | The endpoint for the source cluster from which RFS will take a snapshot                                                                                                    |
-| managedServiceSourceSnapshotEnabled | boolean | true                                                                 | Create the necessary roles and trust relationships to take a snapshot of a managed service source cluster. This is only compatible with SigV4 auth.                        |
+| managedServiceSourceSnapshotEnabled | boolean | true                                                                 | Create the necessary roles and trust relationships to take a snapshot of a managed service source cluster. This is only compatible with SigV4 auth. Default as true if not specified and source cluster is set with sigv4 auth.                         |
 | reindexFromSnapshotMaxShardSizeGiB                     | integer | 80                                                                   | OPTIONAL: The size, in whole GiB, of the largest shard you want to migrate across all indices; used to ensure we have enough disk space reserved to perform the migration.  Default: 80 GiB                                   |
 | reindexFromSnapshotWorkerSize                       | enum | default | maximum                                                                   | OPTIONAL: default provisions a 2vCPU worker balancing speed with cost efficiency designed for most migrations with horizontal scaling, maximum provisions a 16vCPU worker for high throughput migrations when parallelization is limited (low source shard count).  Default: default                                   |
 

deployment/cdk/opensearch-service-migration/test/stack-composer.test.ts

@@ -3,7 +3,7 @@ import { OpenSearchDomainStack } from "../lib/opensearch-domain-stack";
 import { createStackComposer, createStackComposerOnlyPassedContext } from "./test-utils";
 import { App } from "aws-cdk-lib";
 import { StackComposer } from "../lib/stack-composer";
-import { KafkaStack } from "../lib";
+import { KafkaStack, MigrationConsoleStack } from "../lib";
 import { describe, beforeEach, afterEach, test, expect, jest } from '@jest/globals';
 import { ContainerImage } from "aws-cdk-lib/aws-ecs";
 
@@ -30,6 +30,78 @@ describe('Stack Composer Tests', () => {
     domainTemplate.resourceCountIs("AWS::OpenSearchService::Domain", 1)
   })
 
+  function testManagedServiceSourceSnapshot(
+    { sourceAuth, additionalOptions }: { sourceAuth: Record<string, unknown>; additionalOptions: Record<string, unknown> },
+    expectedRoleCount: number,
+    description: string
+  ) {
+    test(description, () => {
+      const contextOptions = {
+        sourceCluster: {
+          "endpoint": "https://test-cluster",
+          "auth": sourceAuth,
+          "version": "ES_7.10"
+        },
+        targetCluster: {
+          "endpoint": "https://test-cluster",
+          "auth": {"type": "none"},
+          "version": "OS_1.3"
+        },
+        vpcEnabled: true,
+        migrationConsoleServiceEnabled: true,
+        migrationAssistanceEnabled: true,
+        reindexFromSnapshotServiceEnabled: true,
+        ...additionalOptions
+      };
+
+      const openSearchStacks = createStackComposer(contextOptions);
+      const migrationConsoleStack = openSearchStacks.stacks.filter((s) => s instanceof MigrationConsoleStack)[0];
+      const migrationConsoleTemplate = Template.fromStack(migrationConsoleStack);
+      migrationConsoleTemplate.resourceCountIs("AWS::IAM::Role", expectedRoleCount);
+      if (expectedRoleCount === 3) {
+        migrationConsoleTemplate.hasResourceProperties("AWS::IAM::Role", {
+          RoleName: "OSMigrations-unit-test-us-east-1-default-SnapshotRole"
+        });
+      }
+    });
+  }
+
+  const sigv4Auth = {
+    "type": "sigv4",
+    "region": "us-east-1",
+    "serviceSigningName": "es"
+  };
+
+  const noAuth = {"type": "none"};
+
+  testManagedServiceSourceSnapshot(
+    {
+      sourceAuth: sigv4Auth,
+      additionalOptions: {}
+    },
+    3,
+    'Test sigv4 source cluster with no managedServiceSourceSnapshotEnabled, defaults to true'
+  );
+
+  testManagedServiceSourceSnapshot(
+    {
+      sourceAuth: sigv4Auth,
+      additionalOptions: { managedServiceSourceSnapshotEnabled: false }
+    },
+    2,
+    'Test sigv4 source cluster with false managedServiceSourceSnapshotEnabled, does not create snapshot role'
+  );
+
+  testManagedServiceSourceSnapshot(
+    {
+      sourceAuth: noAuth,
+      additionalOptions: {}
+    },
+    2,
+    'Test no auth source cluster with no managedServiceSourceSnapshotEnabled, defaults to false'
+  );
+
+
   test('Test invalid engine version format throws error', () => {
     const contextOptions = {
       // Should be OS_1.3