feat(Execute Workflow Node): Run once for each item mode (#7289)

Github issue / Community forum post (link here to close automatically):

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

@@ -0,0 +1,58 @@
+import {
+	NodeOperationError,
+	type IExecuteFunctions,
+	type IExecuteWorkflowInfo,
+	jsonParse,
+} from 'n8n-workflow';
+
+import { readFile as fsReadFile } from 'fs/promises';
+
+export async function getWorkflowInfo(this: IExecuteFunctions, source: string, itemIndex = 0) {
+	const workflowInfo: IExecuteWorkflowInfo = {};
+
+	if (source === 'database') {
+		// Read workflow from database
+		workflowInfo.id = this.getNodeParameter('workflowId', itemIndex) as string;
+	} else if (source === 'localFile') {
+		// Read workflow from filesystem
+		const workflowPath = this.getNodeParameter('workflowPath', itemIndex) as string;
+
+		let workflowJson;
+		try {
+			workflowJson = await fsReadFile(workflowPath, { encoding: 'utf8' });
+		} catch (error) {
+			if (error.code === 'ENOENT') {
+				throw new NodeOperationError(
+					this.getNode(),
+					`The file "${workflowPath}" could not be found, [item ${itemIndex}]`,
+				);
+			}
+
+			throw error;
+		}
+
+		workflowInfo.code = jsonParse(workflowJson);
+	} else if (source === 'parameter') {
+		// Read workflow from parameter
+		const workflowJson = this.getNodeParameter('workflowJson', itemIndex) as string;
+		workflowInfo.code = jsonParse(workflowJson);
+	} else if (source === 'url') {
+		// Read workflow from url
+		const workflowUrl = this.getNodeParameter('workflowUrl', itemIndex) as string;
+
+		const requestOptions = {
+			headers: {
+				accept: 'application/json,text/*;q=0.99',
+			},
+			method: 'GET',
+			uri: workflowUrl,
+			json: true,
+			gzip: true,
+		};
+
+		const response = await this.helpers.request(requestOptions);
+		workflowInfo.code = response;
+	}
+
+	return workflowInfo;
+}