feat(Respond to Webhook Node): Move from Binary Buffer to Binary streaming (#5613)

* replace binary buffer with binary streaming

* Add binary assertion and remove duplicate code

* handle streams correctly

* fix binary response in `own` mode

* fix stream response missing headers

---------

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <netroy@users.noreply.github.com>
Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
Co-authored-by: Marcus <marcus@n8n.io>

packages/cli/src/WebhookHelpers.ts

@@ -15,10 +15,13 @@
 /* eslint-disable prefer-destructuring */
 import type express from 'express';
 import get from 'lodash.get';
+import stream from 'stream';
+import { promisify } from 'util';
 
 import { BinaryDataManager, NodeExecuteFunctions, eventEmitter } from 'n8n-core';
 
 import type {
+	IBinaryData,
 	IBinaryKeyData,
 	IDataObject,
 	IDeferredPromise,
@@ -59,6 +62,8 @@ import type { WorkflowEntity } from '@db/entities/WorkflowEntity';
 import { getWorkflowOwner } from '@/UserManagement/UserManagementHelper';
 import { Container } from 'typedi';
 
+const pipeline = promisify(stream.pipeline);
+
 export const WEBHOOK_METHODS = ['DELETE', 'GET', 'HEAD', 'PATCH', 'POST', 'PUT'];
 
 /**
@@ -418,13 +423,17 @@ export async function executeWebhook(
 						return;
 					}
 
-					if (Buffer.isBuffer(response.body)) {
+					const binaryData = (response.body as IDataObject)?.binaryData as IBinaryData;
+					if (binaryData?.id) {
+						res.header(response.headers);
+						const stream = NodeExecuteFunctions.getBinaryStream(binaryData.id);
+						void pipeline(stream, res).then(() =>
+							responseCallback(null, { noWebhookResponse: true }),
+						);
+					} else if (Buffer.isBuffer(response.body)) {
 						res.header(response.headers);
 						res.end(response.body);
-
-						responseCallback(null, {
-							noWebhookResponse: true,
-						});
+						responseCallback(null, { noWebhookResponse: true });
 					} else {
 						// TODO: This probably needs some more changes depending on the options on the
 						//       Webhook Response node

packages/nodes-base/nodes/RespondToWebhook/RespondToWebhook.node.ts

@@ -1,3 +1,4 @@
+import type { Readable } from 'stream';
 import type {
 	IDataObject,
 	IExecuteFunctions,
@@ -7,7 +8,7 @@ import type {
 	INodeType,
 	INodeTypeDescription,
 } from 'n8n-workflow';
-import { jsonParse, NodeOperationError } from 'n8n-workflow';
+import { jsonParse, BINARY_ENCODING, NodeOperationError } from 'n8n-workflow';
 
 export class RespondToWebhook implements INodeType {
 	description: INodeTypeDescription = {
@@ -201,7 +202,7 @@ export class RespondToWebhook implements INodeType {
 			}
 		}
 
-		let responseBody: IN8nHttpResponse;
+		let responseBody: IN8nHttpResponse | Readable;
 		if (respondWith === 'json') {
 			const responseBodyParameter = this.getNodeParameter('responseBody', 0) as string;
 			if (responseBodyParameter) {
@@ -235,15 +236,16 @@ export class RespondToWebhook implements INodeType {
 			}
 
 			const binaryData = this.helpers.assertBinaryData(0, responseBinaryPropertyName);
-			const binaryDataBuffer = await this.helpers.getBinaryDataBuffer(
-				0,
-				responseBinaryPropertyName,
-			);
+			if (binaryData.id) {
+				responseBody = { binaryData };
+			} else {
+				responseBody = Buffer.from(binaryData.data, BINARY_ENCODING);
+				headers['content-length'] = (responseBody as Buffer).length;
+			}
 
 			if (!headers['content-type']) {
 				headers['content-type'] = binaryData.mimeType;
 			}
-			responseBody = binaryDataBuffer;
 		} else if (respondWith !== 'noData') {
 			throw new NodeOperationError(
 				this.getNode(),

packages/workflow/src/Interfaces.ts

@@ -527,7 +527,7 @@ export interface IHttpRequestOptions {
 export type IN8nHttpResponse = IDataObject | Buffer | GenericValue | GenericValue[] | null;
 
 export interface IN8nHttpFullResponse {
-	body: IN8nHttpResponse;
+	body: IN8nHttpResponse | Readable;
 	headers: IDataObject;
 	statusCode: number;
 	statusMessage?: string;