Display node-error only on executing nodes (#2274)

* ⚡ Dot not display errors on disconnected nodes

* ⚡ Fix some more inconsistencies

packages/core/src/WorkflowExecute.ts

@@ -582,7 +582,14 @@ export class WorkflowExecute {
 
 		const startedAt = new Date();
 
-		const workflowIssues = workflow.checkReadyForExecution();
+		const startNode = this.runExecutionData.executionData!.nodeExecutionStack[0].node.name;
+
+		let destinationNode: string | undefined;
+		if (this.runExecutionData.startData && this.runExecutionData.startData.destinationNode) {
+			destinationNode = this.runExecutionData.startData.destinationNode;
+		}
+
+		const workflowIssues = workflow.checkReadyForExecution({ startNode, destinationNode });
 		if (workflowIssues !== null) {
 			throw new Error(
 				'The workflow has issues and can for that reason not be executed. Please fix them first.',

packages/editor-ui/src/components/mixins/workflowHelpers.ts

@@ -1,6 +1,9 @@
 import {
+	ERROR_TRIGGER_NODE_NAME,
 	PLACEHOLDER_FILLED_AT_EXECUTION_TIME,
 	PLACEHOLDER_EMPTY_WORKFLOW_ID,
+	START_NODE_TYPE,
+	WEBHOOK_NODE_NAME,
 } from '@/constants';
 
 import {
@@ -144,13 +147,39 @@ export const workflowHelpers = mixins(
 			},
 
 			// Checks if everything in the workflow is complete and ready to be executed
-			checkReadyForExecution (workflow: Workflow) {
+			checkReadyForExecution (workflow: Workflow, lastNodeName?: string) {
 				let node: INode;
 				let nodeType: INodeType | undefined;
 				let nodeIssues: INodeIssues | null = null;
 				const workflowIssues: IWorfklowIssues = {};
 
-				for (const nodeName of Object.keys(workflow.nodes)) {
+				let checkNodes = Object.keys(workflow.nodes);
+				if (lastNodeName) {
+					checkNodes = workflow.getParentNodes(lastNodeName);
+					checkNodes.push(lastNodeName);
+				} else {
+					// As webhook nodes always take presidence check first
+					// if there are any
+					let checkWebhook: string[] = [];
+					for (const nodeName of Object.keys(workflow.nodes)) {
+						if (workflow.nodes[nodeName].disabled !== true && workflow.nodes[nodeName].type === WEBHOOK_NODE_NAME) {
+							checkWebhook = [nodeName, ...checkWebhook, ...workflow.getChildNodes(nodeName)];
+						}
+					}
+
+					if (checkWebhook.length) {
+						checkNodes = checkWebhook;
+					} else {
+						// If no webhook nodes got found try to find another trigger node
+						const startNode = workflow.getStartNode();
+						if (startNode !== undefined) {
+							checkNodes = workflow.getChildNodes(startNode.name);
+							checkNodes.push(startNode.name);
+						}
+					}
+				}
+
+				for (const nodeName of checkNodes) {
 					nodeIssues = null;
 					node = workflow.nodes[nodeName];
 
@@ -214,6 +243,10 @@ export const workflowHelpers = mixins(
 
 						return {
 							description: nodeTypeDescription,
+							// As we do not have the trigger/poll functions available in the frontend
+							// we use the information available to figure out what are trigger nodes
+							// @ts-ignore
+							trigger: ![ERROR_TRIGGER_NODE_NAME, START_NODE_TYPE].includes(nodeType) && nodeTypeDescription.inputs.length === 0 && !nodeTypeDescription.webhooks || undefined,
 						};
 					},
 				};

packages/editor-ui/src/components/mixins/workflowRun.ts

@@ -55,7 +55,7 @@ export const workflowRun = mixins(
 
 			return response;
 		},
-		async runWorkflow (nodeName: string, source?: string): Promise<IExecutionPushResponse | undefined> {
+		async runWorkflow (nodeName?: string, source?: string): Promise<IExecutionPushResponse | undefined> {
 			if (this.$store.getters.isActionActive('workflowRunning') === true) {
 				return;
 			}
@@ -70,7 +70,7 @@ export const workflowRun = mixins(
 				const issuesExist = this.$store.getters.nodesIssuesExist;
 				if (issuesExist === true) {
 					// If issues exist get all of the issues of all nodes
-					const workflowIssues = this.checkReadyForExecution(workflow);
+					const workflowIssues = this.checkReadyForExecution(workflow, nodeName);
 					if (workflowIssues !== null) {
 						const errorMessages = [];
 						let nodeIssues: string[];
@@ -94,7 +94,10 @@ export const workflowRun = mixins(
 				}
 
 				// Get the direct parents of the node
-				const directParentNodes = workflow.getParentNodes(nodeName, 'main', 1);
+				let directParentNodes: string[] = [];
+				if (nodeName !== undefined) {
+					directParentNodes = workflow.getParentNodes(nodeName, 'main', 1);
+				}
 
 				const runData = this.$store.getters.getWorkflowRunData;
 
@@ -133,7 +136,7 @@ export const workflowRun = mixins(
 					}
 				}
 
-				if (startNodes.length === 0) {
+				if (startNodes.length === 0 && nodeName !== undefined) {
 					startNodes.push(nodeName);
 				}
 

packages/editor-ui/src/constants.ts

@@ -54,6 +54,7 @@ export const ALL_NODE_FILTER = 'All';
 export const UNCATEGORIZED_CATEGORY = 'Miscellaneous';
 export const UNCATEGORIZED_SUBCATEGORY = 'Helpers';
 export const HIDDEN_NODES = ['n8n-nodes-base.start'];
+export const ERROR_TRIGGER_NODE_NAME = 'n8n-nodes-base.errorTrigger';
 export const WEBHOOK_NODE_NAME = 'n8n-nodes-base.webhook';
 export const HTTP_REQUEST_NODE_NAME = 'n8n-nodes-base.httpRequest';
 export const REQUEST_NODE_FORM_URL = 'https://n8n-community.typeform.com/to/K1fBVTZ3';

packages/workflow/src/Workflow.ts

@@ -231,13 +231,29 @@ export class Workflow {
 	 * @returns {(IWorfklowIssues | null)}
 	 * @memberof Workflow
 	 */
-	checkReadyForExecution(): IWorfklowIssues | null {
+	checkReadyForExecution(inputData: {
+		startNode?: string;
+		destinationNode?: string;
+	}): IWorfklowIssues | null {
 		let node: INode;
 		let nodeType: INodeType | undefined;
 		let nodeIssues: INodeIssues | null = null;
 		const workflowIssues: IWorfklowIssues = {};
 
-		for (const nodeName of Object.keys(this.nodes)) {
+		let checkNodes: string[] = [];
+		if (inputData.destinationNode) {
+			// If a destination node is given we have to check all the nodes
+			// leading up to it
+			checkNodes = this.getParentNodes(inputData.destinationNode);
+			checkNodes.push(inputData.destinationNode);
+		} else if (inputData.startNode) {
+			// If a start node is given we have to check all nodes which
+			// come after it
+			checkNodes = this.getChildNodes(inputData.startNode);
+			checkNodes.push(inputData.startNode);
+		}
+
+		for (const nodeName of checkNodes) {
 			nodeIssues = null;
 			node = this.nodes[nodeName];