feat(editor): Use resource locator at Simple Vector Store memory key, allow cross workflow use (#15421)

Remove workflow isolation from in-memory Simple Vector Store, making it possible to use vector stores created on other workflows. Display all current in-memory vector stores with a resource locator at Memory Key picker.

Note that these vector stores are still intended for non-production development use. Any users of an instance can access data in all in-memory vector stores as they aren't bound to workflows.

packages/@n8n/nodes-langchain/nodes/vector_store/shared/MemoryManager/MemoryVectorStoreManager.ts

@@ -124,6 +124,10 @@ export class MemoryVectorStoreManager {
 		}
 	}
 
+	getMemoryKeysList(): string[] {
+		return Array.from(this.vectorStoreBuffer.keys());
+	}
+
 	/**
 	 * Get or create a vector store by key
 	 */

packages/@n8n/nodes-langchain/nodes/vector_store/shared/MemoryManager/test/MemoryVectorStoreManager.test.ts

@@ -246,4 +246,34 @@ describe('MemoryVectorStoreManager', () => {
 		expect(stats.stores.store1.vectors).toBe(50);
 		expect(stats.stores.store2.vectors).toBe(30);
 	});
+
+	it('should list all vector stores', async () => {
+		const embeddings = mock<OpenAIEmbeddings>();
+		const instance = MemoryVectorStoreManager.getInstance(embeddings, logger);
+
+		const mockVectorStore1 = mock<MemoryVectorStore>();
+		// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+		mockVectorStore1.memoryVectors = new Array(50).fill({
+			embedding: createTestEmbedding(),
+			content: 'test1',
+			metadata: {},
+		});
+
+		const mockVectorStore2 = mock<MemoryVectorStore>();
+		// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+		mockVectorStore2.memoryVectors = new Array(30).fill({
+			embedding: createTestEmbedding(),
+			content: 'test2',
+			metadata: {},
+		});
+
+		// Mock internal state
+		instance['vectorStoreBuffer'].set('store1', mockVectorStore1);
+		instance['vectorStoreBuffer'].set('store2', mockVectorStore2);
+
+		const list = instance.getMemoryKeysList();
+		expect(list).toHaveLength(2);
+		expect(list[0]).toBe('store1');
+		expect(list[1]).toBe('store2');
+	});
 });

packages/@n8n/nodes-langchain/nodes/vector_store/shared/createVectorStoreNode/__snapshots__/createVectorStoreNode.test.ts.snap

@@ -253,6 +253,7 @@ exports[`createVectorStoreNode retrieve mode supplies vector store as data 1`] =
   "version": [
     1,
     1.1,
+    1.2,
   ],
 }
 `;

packages/@n8n/nodes-langchain/nodes/vector_store/shared/createVectorStoreNode/createVectorStoreNode.ts

@@ -43,7 +43,8 @@ export const createVectorStoreNode = <T extends VectorStore = VectorStore>(
 			icon: args.meta.icon,
 			iconColor: args.meta.iconColor,
 			group: ['transform'],
-			version: [1, 1.1],
+			// 1.2 has changes to VectorStoreInMemory node.
+			version: [1, 1.1, 1.2],
 			defaults: {
 				name: args.meta.displayName,
 			},

packages/@n8n/nodes-langchain/nodes/vector_store/shared/createVectorStoreNode/types.ts

@@ -10,6 +10,8 @@ import type {
 	Icon,
 	ISupplyDataFunctions,
 	ThemeIconColor,
+	IDataObject,
+	NodeParameterValueType,
 } from 'n8n-workflow';
 
 export type NodeOperationMode = 'insert' | 'load' | 'retrieve' | 'update' | 'retrieve-as-tool';
@@ -35,6 +37,12 @@ export interface VectorStoreNodeConstructorArgs<T extends VectorStore = VectorSt
 				paginationToken?: string,
 			) => Promise<INodeListSearchResult>;
 		};
+		actionHandler?: {
+			[functionName: string]: (
+				this: ILoadOptionsFunctions,
+				payload: IDataObject | string | undefined,
+			) => Promise<NodeParameterValueType>;
+		};
 	};
 
 	sharedFields: INodeProperties[];