feat: Add support for AI log streaming (#8526)

Co-authored-by: Oleg Ivaniv <me@olegivaniv.com>

packages/workflow/src/Interfaces.ts

@@ -787,6 +787,7 @@ type BaseExecutionFunctions = FunctionsBaseWithRequiredKeys<'getMode'> & {
 	getInputSourceData(inputIndex?: number, inputName?: string): ISourceData;
 	getExecutionCancelSignal(): AbortSignal | undefined;
 	onExecutionCancellation(handler: () => unknown): void;
+	logAiEvent(eventName: EventNamesAiNodesType, msg?: string | undefined): Promise<void>;
 };
 
 // TODO: Create later own type only for Config-Nodes
@@ -1945,6 +1946,24 @@ export interface IWorkflowExecuteHooks {
 	sendResponse?: Array<(response: IExecuteResponsePromiseData) => Promise<void>>;
 }
 
+export const eventNamesAiNodes = [
+	'n8n.ai.memory.get.messages',
+	'n8n.ai.memory.added.message',
+	'n8n.ai.output.parser.get.instructions',
+	'n8n.ai.output.parser.parsed',
+	'n8n.ai.retriever.get.relevant.documents',
+	'n8n.ai.embeddings.embedded.document',
+	'n8n.ai.embeddings.embedded.query',
+	'n8n.ai.document.processed',
+	'n8n.ai.text.splitter.split',
+	'n8n.ai.tool.called',
+	'n8n.ai.vector.store.searched',
+	'n8n.ai.llm.generated',
+	'n8n.ai.vector.store.populated',
+] as const;
+
+export type EventNamesAiNodesType = (typeof eventNamesAiNodes)[number];
+
 export interface IWorkflowExecuteAdditionalData {
 	credentialsHelper: ICredentialsHelper;
 	executeWorkflow: (
@@ -1978,6 +1997,17 @@ export interface IWorkflowExecuteAdditionalData {
 	userId: string;
 	variables: IDataObject;
 	secretsHelpers: SecretsHelpersBase;
+	logAiEvent: (
+		eventName: EventNamesAiNodesType,
+		payload: {
+			msg?: string;
+			executionId: string;
+			nodeName: string;
+			workflowId?: string;
+			workflowName: string;
+			nodeType?: string;
+		},
+	) => Promise<void>;
 }
 
 export type WorkflowExecuteMode =

packages/workflow/src/MessageEventBus.ts

@@ -11,6 +11,7 @@ export const enum EventMessageTypeNames {
 	confirm = '$$EventMessageConfirm',
 	workflow = '$$EventMessageWorkflow',
 	node = '$$EventMessageNode',
+	aiNode = '$$EventMessageAiNode',
 }
 
 export const enum MessageEventBusDestinationTypeNames {