feat: Respond to chat and wait for response (#12546)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>
Co-authored-by: Shireen Missi <94372015+ShireenMissi@users.noreply.github.com>

packages/core/src/execution-engine/node-execution-context/__tests__/node-execution-context.test.ts

@@ -10,7 +10,7 @@ import type {
 	Workflow,
 	WorkflowExecuteMode,
 } from 'n8n-workflow';
-import { NodeConnectionTypes } from 'n8n-workflow';
+import { CHAT_TRIGGER_NODE_TYPE, NodeConnectionTypes } from 'n8n-workflow';
 
 import { InstanceSettings } from '@/instance-settings';
 
@@ -115,6 +115,31 @@ describe('NodeExecutionContext', () => {
 		});
 	});
 
+	describe('getChatTrigger', () => {
+		it('should return a chat trigger node if it exists in the workflow', () => {
+			const chatNode = mock<INode>({ name: 'Chat', type: CHAT_TRIGGER_NODE_TYPE });
+
+			workflow.nodes = {
+				Chat: chatNode,
+			};
+
+			const result = testContext.getChatTrigger();
+
+			expect(result).toEqual(chatNode);
+		});
+		it('should return a null if there is no chat trigger node in the workflow', () => {
+			const someNode = mock<INode>({ name: 'Some Node', type: 'someType' });
+
+			workflow.nodes = {
+				'Some Node': someNode,
+			};
+
+			const result = testContext.getChatTrigger();
+
+			expect(result).toBeNull();
+		});
+	});
+
 	describe('getKnownNodeTypes', () => {
 		it('should call getKnownTypes method of nodeTypes', () => {
 			testContext.getKnownNodeTypes();

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

@@ -25,6 +25,7 @@ import type {
 } from 'n8n-workflow';
 import {
 	ApplicationError,
+	CHAT_TRIGGER_NODE_TYPE,
 	deepCopy,
 	ExpressionError,
 	NodeHelpers,
@@ -106,22 +107,43 @@ export abstract class NodeExecutionContext implements Omit<FunctionsBase, 'getCr
 		return output;
 	}
 
-	getParentNodes(nodeName: string) {
+	getParentNodes(nodeName: string, options?: { includeNodeParameters?: boolean }) {
 		const output: NodeTypeAndVersion[] = [];
 		const nodeNames = this.workflow.getParentNodes(nodeName);
 
 		for (const n of nodeNames) {
 			const node = this.workflow.nodes[n];
-			output.push({
+			const entry: NodeTypeAndVersion = {
 				name: node.name,
 				type: node.type,
 				typeVersion: node.typeVersion,
 				disabled: node.disabled ?? false,
-			});
+			};
+
+			if (options?.includeNodeParameters) {
+				entry.parameters = node.parameters;
+			}
+
+			output.push(entry);
 		}
 		return output;
 	}
 
+	/**
+	 * Gets the chat trigger node
+	 *
+	 * this is needed for sub-nodes where the parent nodes are not available
+	 */
+	getChatTrigger() {
+		for (const node of Object.values(this.workflow.nodes)) {
+			if (this.workflow.nodes[node.name].type === CHAT_TRIGGER_NODE_TYPE) {
+				return this.workflow.nodes[node.name];
+			}
+		}
+
+		return null;
+	}
+
 	@Memoized
 	get nodeType() {
 		const { type, typeVersion } = this.node;