feat(RabbitMQ Node): Add mode for acknowledging and deleting from queue later in workflow (#6225)

* Add later in workflow mode

* Add new operation

* Acknowledge message in next node

* Add response and emit for responsePromiseHook

* Remove double success message, close channel correctly

* Answser messages correctly

* Remove option from delete operation

* move operation name to camelCase

* Fix versioning

* To remove: add action item in v1

* Add notice for delete from queue

* Correctly only execute only the delete operation

* Refactor delete from queue operator and add return last items

---------

Co-authored-by: Marcus <marcus@n8n.io>

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

@@ -23,7 +23,7 @@ export class RabbitMQ implements INodeType {
 		// eslint-disable-next-line n8n-nodes-base/node-class-description-icon-not-svg
 		icon: 'file:rabbitmq.png',
 		group: ['transform'],
-		version: 1,
+		version: [1, 1.1],
 		description: 'Sends messages to a RabbitMQ topic',
 		defaults: {
 			name: 'RabbitMQ',
@@ -43,18 +43,71 @@ export class RabbitMQ implements INodeType {
 				name: 'operation',
 				type: 'hidden',
 				noDataExpression: true,
-				default: 'send_message',
+				default: 'sendMessage',
+				displayOptions: {
+					show: {
+						'@version': [1],
+					},
+				},
+				// To remove when action view is fixed
 				options: [
 					{
 						name: 'Send a Message to RabbitMQ',
-						value: 'send_message',
+						value: 'sendMessage',
+						action: 'Send a Message to RabbitMQ',
+					},
+					{
+						name: 'Delete From Queue',
+						value: 'deleteMessage',
+						action: 'Delete From Queue',
 					},
 				],
 			},
+			{
+				displayName: 'Operation',
+				name: 'operation',
+				type: 'options',
+				noDataExpression: true,
+				default: 'sendMessage',
+				displayOptions: {
+					show: {
+						'@version': [1.1],
+					},
+				},
+				options: [
+					{
+						name: 'Send a Message to RabbitMQ',
+						value: 'sendMessage',
+						action: 'Send a Message to RabbitMQ',
+					},
+					{
+						name: 'Delete From Queue',
+						value: 'deleteMessage',
+						action: 'Delete From Queue',
+					},
+				],
+			},
+			{
+				displayName:
+					'Will delete an item from the queue triggered earlier in the workflow by a RabbitMQ Trigger node',
+				name: 'deleteMessage',
+				type: 'notice',
+				default: '',
+				displayOptions: {
+					show: {
+						operation: ['deleteMessage'],
+					},
+				},
+			},
 			{
 				displayName: 'Mode',
 				name: 'mode',
 				type: 'options',
+				displayOptions: {
+					hide: {
+						operation: ['deleteMessage'],
+					},
+				},
 				options: [
 					{
 						name: 'Queue',
@@ -82,6 +135,9 @@ export class RabbitMQ implements INodeType {
 					show: {
 						mode: ['queue'],
 					},
+					hide: {
+						operation: ['deleteMessage'],
+					},
 				},
 				default: '',
 				placeholder: 'queue-name',
@@ -161,6 +217,11 @@ export class RabbitMQ implements INodeType {
 				displayName: 'Send Input Data',
 				name: 'sendInputData',
 				type: 'boolean',
+				displayOptions: {
+					show: {
+						operation: ['sendMessage'],
+					},
+				},
 				default: true,
 				description: 'Whether to send the the data the node receives as JSON',
 			},
@@ -181,6 +242,11 @@ export class RabbitMQ implements INodeType {
 				name: 'options',
 				type: 'collection',
 				default: {},
+				displayOptions: {
+					show: {
+						operation: ['sendMessage'],
+					},
+				},
 				placeholder: 'Add Option',
 				options: [
 					{
@@ -341,10 +407,13 @@ export class RabbitMQ implements INodeType {
 		let channel, options: IDataObject;
 		try {
 			const items = this.getInputData();
-			const mode = this.getNodeParameter('mode', 0) as string;
-
+			const operation = this.getNodeParameter('operation', 0);
+			if (operation === 'deleteMessage') {
+				this.sendResponse(items[0].json);
+				return await this.prepareOutputData(items);
+			}
+			const mode = (this.getNodeParameter('mode', 0) as string) || 'queue';
 			const returnItems: INodeExecutionData[] = [];
-
 			if (mode === 'queue') {
 				const queue = this.getNodeParameter('queue', 0) as string;
 
@@ -355,7 +424,6 @@ export class RabbitMQ implements INodeType {
 				const sendInputData = this.getNodeParameter('sendInputData', 0) as boolean;
 
 				let message: string;
-
 				const queuePromises = [];
 				for (let i = 0; i < items.length; i++) {
 					if (sendInputData) {
@@ -378,7 +446,6 @@ export class RabbitMQ implements INodeType {
 						);
 						headers = additionalHeaders;
 					}
-
 					queuePromises.push(channel.sendToQueue(queue, Buffer.from(message), { headers }));
 				}
 

packages/nodes-base/nodes/RabbitMQ/RabbitMQTrigger.node.ts

@@ -2,6 +2,7 @@
 import type {
 	IDataObject,
 	IDeferredPromise,
+	IExecuteResponsePromiseData,
 	INodeExecutionData,
 	INodeProperties,
 	INodeType,
@@ -45,7 +46,6 @@ export class RabbitMQTrigger implements INodeType {
 				placeholder: 'queue-name',
 				description: 'The name of the queue to read from',
 			},
-
 			{
 				displayName: 'Options',
 				name: 'options',
@@ -81,6 +81,11 @@ export class RabbitMQTrigger implements INodeType {
 								value: 'immediately',
 								description: 'As soon as the message got received',
 							},
+							{
+								name: 'Specified Later in Workflow',
+								value: 'laterMessageNode',
+								description: 'Using a RabbitMQ node to remove the item from the queue',
+							},
 						],
 						default: 'immediately',
 						description: 'When to acknowledge the message',
@@ -139,6 +144,18 @@ export class RabbitMQTrigger implements INodeType {
 					return 0;
 				}) as INodeProperties[],
 			},
+			{
+				displayName:
+					"To delete an item from the queue, insert a RabbitMQ node later in the workflow and use the 'Delete from queue' operation",
+				name: 'laterMessageNode',
+				type: 'notice',
+				displayOptions: {
+					show: {
+						'/options.acknowledge': ['laterMessageNode'],
+					},
+				},
+				default: '',
+			},
 		],
 	};
 
@@ -201,7 +218,6 @@ export class RabbitMQTrigger implements INodeType {
 						const item: INodeExecutionData = {
 							json: {},
 						};
-
 						if (options.contentIsBinary === true) {
 							item.binary = {
 								data: await this.helpers.prepareBinaryData(message.content),
@@ -222,13 +238,20 @@ export class RabbitMQTrigger implements INodeType {
 						}
 
 						let responsePromise: IDeferredPromise<IRun> | undefined = undefined;
-						if (acknowledgeMode !== 'immediately') {
+						let responsePromiseHook: IDeferredPromise<IExecuteResponsePromiseData> | undefined =
+							undefined;
+						if (acknowledgeMode !== 'immediately' && acknowledgeMode !== 'laterMessageNode') {
 							responsePromise = await this.helpers.createDeferredPromise();
+						} else if (acknowledgeMode === 'laterMessageNode') {
+							responsePromiseHook =
+								await this.helpers.createDeferredPromise<IExecuteResponsePromiseData>();
 						}
-
-						this.emit([[item]], undefined, responsePromise);
-
-						if (responsePromise) {
+						if (responsePromiseHook) {
+							this.emit([[item]], responsePromiseHook, undefined);
+						} else {
+							this.emit([[item]], undefined, responsePromise);
+						}
+						if (responsePromise && acknowledgeMode !== 'laterMessageNode') {
 							// Acknowledge message after the execution finished
 							await responsePromise.promise().then(async (data: IRun) => {
 								if (data.data.resultData.error) {
@@ -239,7 +262,11 @@ export class RabbitMQTrigger implements INodeType {
 										return;
 									}
 								}
-
+								channel.ack(message);
+								messageTracker.answered(message);
+							});
+						} else if (responsePromiseHook && acknowledgeMode === 'laterMessageNode') {
+							await responsePromiseHook.promise().then(() => {
 								channel.ack(message);
 								messageTracker.answered(message);
 							});
@@ -266,7 +293,6 @@ export class RabbitMQTrigger implements INodeType {
 			});
 			consumerTag = consumerInfo.consumerTag;
 		};
-
 		await startConsumer();
 
 		// The "closeFunction" function gets called by n8n whenever