load on demand selected workflow inputs

packages/cli/src/services/dynamic-node-parameters.service.ts

@@ -300,6 +300,11 @@ export class DynamicNodeParametersService {
 	}
 
 	private getLocalLoadOptionsContext(path: string, additionalData: IWorkflowExecuteAdditionalData) {
-		return new LocalLoadOptionsContext(additionalData, path, this.workflowLoaderService);
+		return new LocalLoadOptionsContext(
+			this.nodeTypes,
+			additionalData,
+			path,
+			this.workflowLoaderService,
+		);
 	}
 }

packages/core/src/node-execution-context/local-load-options-context.ts

@@ -1,22 +1,27 @@
 import { get } from 'lodash';
-import { ApplicationError } from 'n8n-workflow';
+import { ApplicationError, deepCopy, Workflow } from 'n8n-workflow';
 import type {
 	INodeParameterResourceLocator,
 	IWorkflowExecuteAdditionalData,
 	NodeParameterValueType,
 	ILocalLoadOptionsFunctions,
 	IWorkflowLoader,
+	IWorkflowNodeContext,
 	INode,
+	INodeTypes,
 } from 'n8n-workflow';
 
+import { LoadWorkflowNodeContext } from './workflow-node-context';
+
 export class LocalLoadOptionsContext implements ILocalLoadOptionsFunctions {
 	constructor(
+		private nodeTypes: INodeTypes,
 		private additionalData: IWorkflowExecuteAdditionalData,
 		private path: string,
 		private workflowLoader: IWorkflowLoader,
 	) {}
 
-	async getExecuteWorkflowTriggerNode(): Promise<INode | undefined> {
+	async getWorkflowNodeContext(nodeType: string): Promise<IWorkflowNodeContext | null> {
 		const { value } = this.getCurrentNodeParameter('workflowId') as INodeParameterResourceLocator;
 
 		const workflowId = value as string;
@@ -24,9 +29,25 @@ export class LocalLoadOptionsContext implements ILocalLoadOptionsFunctions {
 			throw new ApplicationError('No workflowId parameter defined on node!');
 		}
 
-		const workflow = await this.workflowLoader.get(workflowId);
+		const dbWorkflow = await this.workflowLoader.get(workflowId);
 
-		return workflow.nodes.find((node) => node.type === 'n8n-nodes-base.executeWorkflowTrigger');
+		const workflowNode = dbWorkflow.nodes.find((node) => node.type === nodeType) as INode;
+
+		if (workflowNode) {
+			const workflow = new Workflow({
+				nodes: [workflowNode],
+				connections: {},
+				active: false,
+				nodeTypes: this.nodeTypes,
+			});
+
+			const workflowAdditionalData = deepCopy(this.additionalData);
+			workflowAdditionalData.currentNodeParameters = workflowNode.parameters;
+
+			return new LoadWorkflowNodeContext(workflow, workflowNode, workflowAdditionalData);
+		}
+
+		return null;
 	}
 
 	getCurrentNodeParameter(parameterPath: string): NodeParameterValueType | object | undefined {

packages/core/src/node-execution-context/workflow-node-context.ts

@@ -0,0 +1,32 @@
+import type {
+	IGetNodeParameterOptions,
+	INode,
+	IWorkflowExecuteAdditionalData,
+	Workflow,
+	IWorkflowNodeContext,
+} from 'n8n-workflow';
+
+import { NodeExecutionContext } from './node-execution-context';
+
+export class LoadWorkflowNodeContext extends NodeExecutionContext implements IWorkflowNodeContext {
+	readonly getNodeParameter: IWorkflowNodeContext['getNodeParameter'];
+
+	constructor(workflow: Workflow, node: INode, additionalData: IWorkflowExecuteAdditionalData) {
+		super(workflow, node, additionalData, 'internal');
+		{
+			this.getNodeParameter = ((
+				parameterName: string,
+				itemIndex: number,
+				// eslint-disable-next-line @typescript-eslint/no-explicit-any
+				fallbackValue?: any,
+				options?: IGetNodeParameterOptions,
+			) =>
+				this._getNodeParameter(
+					parameterName,
+					itemIndex,
+					fallbackValue,
+					options,
+				)) as IWorkflowNodeContext['getNodeParameter'];
+		}
+	}
+}

packages/nodes-base/nodes/ExecuteWorkflow/ExecuteWorkflow/methods/resourceMapping.ts

@@ -1,25 +1,22 @@
-import type {
+import {
-	ILocalLoadOptionsFunctions,
+	EXECUTE_WORKFLOW_TRIGGER_NODE_TYPE,
-	INode,
+	type ILocalLoadOptionsFunctions,
-	ResourceMapperField,
+	type ResourceMapperField,
-	ResourceMapperFields,
+	type ResourceMapperFields,
 } from 'n8n-workflow';
 
+import { getFieldEntries } from '../../GenericFunctions';
+
 export async function getWorkflowInputs(
 	this: ILocalLoadOptionsFunctions,
 ): Promise<ResourceMapperFields> {
-	const executeWorkflowTriggerNode = (await this.getExecuteWorkflowTriggerNode()) as INode;
+	const nodeLoadContext = await this.getWorkflowNodeContext(EXECUTE_WORKFLOW_TRIGGER_NODE_TYPE);
+	let fields: ResourceMapperField[] = [];
 
-	// const fieldValues = getFieldEntries(executeWorkflowTriggerNode);
+	if (nodeLoadContext) {
+		const fieldValues = getFieldEntries(nodeLoadContext);
 
-	const workflowInputFields = [
+		fields = fieldValues.map((currentWorkflowInput) => {
-		{ name: 'field1', type: 'string' as const },
-		{ name: 'field2', type: 'number' as const },
-		{ name: 'field3', type: 'boolean' as const },
-		{ name: 'field4', type: 'any' as const },
-	];
-
-	const fields: ResourceMapperField[] = workflowInputFields.map((currentWorkflowInput) => {
 			const field: ResourceMapperField = {
 				id: currentWorkflowInput.name,
 				displayName: currentWorkflowInput.name,
@@ -35,5 +32,6 @@ export async function getWorkflowInputs(
 
 			return field;
 		});
+	}
 	return { fields };
 }

packages/nodes-base/nodes/ExecuteWorkflow/GenericFunctions.ts

@@ -1,6 +1,6 @@
 import { json as generateSchemaFromExample, type SchemaObject } from 'generate-schema';
 import type { JSONSchema7 } from 'json-schema';
-import type { FieldValueOption, FieldType, IExecuteFunctions } from 'n8n-workflow';
+import type { FieldValueOption, FieldType, IWorkflowNodeContext } from 'n8n-workflow';
 import { jsonParse, NodeOperationError } from 'n8n-workflow';
 
 import { JSON_EXAMPLE, INPUT_SOURCE, WORKFLOW_INPUTS, VALUES, TYPE_OPTIONS } from './constants';
@@ -40,14 +40,14 @@ function parseJsonSchema(schema: JSONSchema7): FieldValueOption[] | string {
 	return result;
 }
 
-function parseJsonExample(context: IExecuteFunctions): JSONSchema7 {
+function parseJsonExample(context: IWorkflowNodeContext): JSONSchema7 {
 	const jsonString = context.getNodeParameter(JSON_EXAMPLE, 0, '') as string;
 	const json = jsonParse<SchemaObject>(jsonString);
 
 	return generateSchemaFromExample(json) as JSONSchema7;
 }
 
-export function getFieldEntries(context: IExecuteFunctions): FieldValueOption[] {
+export function getFieldEntries(context: IWorkflowNodeContext): FieldValueOption[] {
 	const inputSource = context.getNodeParameter(INPUT_SOURCE, 0);
 	let result: FieldValueOption[] | string = 'Internal Error: Invalid input source';
 	try {

packages/workflow/src/Interfaces.ts

@@ -1067,13 +1067,17 @@ export interface ILoadOptionsFunctions extends FunctionsBase {
 		options?: IGetNodeParameterOptions,
 	): NodeParameterValueType | object | undefined;
 	getCurrentNodeParameters(): INodeParameters | undefined;
+
 	helpers: RequestHelperFunctions & SSHTunnelFunctions;
 }
 
 export type FieldValueOption = { name: string; type: FieldType | 'any' };
 
+export type IWorkflowNodeContext = ExecuteFunctions.GetNodeParameterFn &
+	Pick<FunctionsBase, 'getNode'>;
+
 export interface ILocalLoadOptionsFunctions {
-	getExecuteWorkflowTriggerNode(): Promise<INode | undefined>;
+	getWorkflowNodeContext(nodeType: string): Promise<IWorkflowNodeContext | null>;
 }
 
 export interface IWorkflowLoader {