feat(task): add task labels and push-based task events

changelog.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## 2026-01-26 - 4.1.0 - feat(task)
+add task labels and push-based task events
+
+- Introduce Task labels: Task accepts labels in constructor and exposes setLabel/getLabel/removeLabel/hasLabel; labels are included (shallow copy) in getMetadata().
+- Add push-based events: Task.eventSubject (rxjs Subject<ITaskEvent>) emits 'started','step','completed','failed' with timestamp; 'step' includes stepName and 'failed' includes error string.
+- Task now emits events during lifecycle: emits 'started' at run start, 'step' on notifyStep, and 'completed' or 'failed' when finished or errored. getMetadata() now includes labels.
+- TaskManager aggregates task events into taskSubject, subscribes on addTask and unsubscribes on removeTask/stop; includes helper methods getTasksByLabel and getTasksMetadataByLabel.
+- Public API updated: exported ITaskEvent and TTaskEventType in ts/index.ts and interfaces updated (labels in metadata, new event types).
+- Tests and docs: added test/test.12.labels-and-events.ts and updated readme.hints.md to document labels and push-based events.
+
 ## 2026-01-25 - 4.0.0 - BREAKING CHANGE(taskbuffer)
 Change default Task error handling: trigger() now rejects when taskFunction throws; add catchErrors option (default false) to preserve previous swallow behavior; track errors (lastError, errorCount) and expose them in metadata; improve error propagation and logging across runners, chains, parallels and debounced tasks; add tests and documentation for new behavior.
 

readme.hints.md

@@ -20,6 +20,20 @@
 - **BufferRunner**: When `catchErrors: false`, buffered task errors now reject the trigger promise (via `CycleCounter.informOfCycleError`) instead of silently resolving with `undefined`
 - **TaskChain stubs completed**: `removeTask(task)` returns `boolean`, `shiftTask()` returns `Task | undefined`
 
+## Task Labels (v4.1.0+)
+- `Task` constructor accepts optional `labels?: Record<string, string>`
+- Helper methods: `setLabel(key, value)`, `getLabel(key)`, `removeLabel(key)`, `hasLabel(key, value?)`
+- `getMetadata()` includes `labels` (shallow copy)
+- `TaskManager.getTasksByLabel(key, value)` returns matching `Task[]`
+- `TaskManager.getTasksMetadataByLabel(key, value)` returns matching `ITaskMetadata[]`
+
+## Push-Based Events (v4.1.0+)
+- `Task.eventSubject`: rxjs `Subject<ITaskEvent>` emitting `'started'`, `'step'`, `'completed'`, `'failed'` events
+- `TaskManager.taskSubject`: aggregated `Subject<ITaskEvent>` from all added tasks
+- `TaskManager.removeTask(task)` unsubscribes and removes from map
+- `TaskManager.stop()` cleans up all event subscriptions
+- Exported types: `ITaskEvent`, `TTaskEventType`
+
 ## Project Structure
 - Source in `ts/`, web components in `ts_web/`
 - Tests in `test/` - naming: `*.node.ts`, `*.browser.ts`, `*.both.ts`

test/test.12.labels-and-events.ts

@@ -0,0 +1,249 @@
+import { expect, tap } from '@git.zone/tstest/tapbundle';
+import * as taskbuffer from '../ts/index.js';
+import type { ITaskEvent } from '../ts/index.js';
+
+// ─── Labels ───
+
+tap.test('should accept labels in constructor', async () => {
+  const task = new taskbuffer.Task({
+    name: 'labelled-task',
+    taskFunction: async () => 'ok',
+    labels: { userId: 'u1', tenantId: 't1' },
+  });
+  expect(task.labels).toEqual({ userId: 'u1', tenantId: 't1' });
+});
+
+tap.test('should default labels to empty object', async () => {
+  const task = new taskbuffer.Task({
+    name: 'no-labels-task',
+    taskFunction: async () => 'ok',
+  });
+  expect(task.labels).toEqual({});
+});
+
+tap.test('setLabel / getLabel / removeLabel / hasLabel should work', async () => {
+  const task = new taskbuffer.Task({
+    name: 'label-helpers-task',
+    taskFunction: async () => 'ok',
+  });
+
+  task.setLabel('env', 'prod');
+  expect(task.getLabel('env')).toEqual('prod');
+  expect(task.hasLabel('env')).toBeTrue();
+  expect(task.hasLabel('env', 'prod')).toBeTrue();
+  expect(task.hasLabel('env', 'dev')).toBeFalse();
+  expect(task.hasLabel('missing')).toBeFalse();
+
+  const removed = task.removeLabel('env');
+  expect(removed).toBeTrue();
+  expect(task.getLabel('env')).toBeUndefined();
+
+  const removedAgain = task.removeLabel('env');
+  expect(removedAgain).toBeFalse();
+});
+
+tap.test('getMetadata() should include labels', async () => {
+  const task = new taskbuffer.Task({
+    name: 'metadata-labels-task',
+    taskFunction: async () => 'ok',
+    labels: { region: 'eu' },
+  });
+
+  const meta = task.getMetadata();
+  expect(meta.labels).toEqual({ region: 'eu' });
+
+  // Returned labels should be a copy
+  meta.labels!['region'] = 'us';
+  expect(task.labels['region']).toEqual('eu');
+});
+
+tap.test('TaskManager.getTasksByLabel should filter correctly', async () => {
+  const manager = new taskbuffer.TaskManager();
+  const t1 = new taskbuffer.Task({
+    name: 'label-filter-1',
+    taskFunction: async () => 'ok',
+    labels: { userId: 'alice' },
+  });
+  const t2 = new taskbuffer.Task({
+    name: 'label-filter-2',
+    taskFunction: async () => 'ok',
+    labels: { userId: 'bob' },
+  });
+  const t3 = new taskbuffer.Task({
+    name: 'label-filter-3',
+    taskFunction: async () => 'ok',
+    labels: { userId: 'alice' },
+  });
+
+  manager.addTask(t1);
+  manager.addTask(t2);
+  manager.addTask(t3);
+
+  const aliceTasks = manager.getTasksByLabel('userId', 'alice');
+  expect(aliceTasks.length).toEqual(2);
+  expect(aliceTasks.map((t) => t.name).sort()).toEqual(['label-filter-1', 'label-filter-3']);
+
+  const bobMeta = manager.getTasksMetadataByLabel('userId', 'bob');
+  expect(bobMeta.length).toEqual(1);
+  expect(bobMeta[0].name).toEqual('label-filter-2');
+
+  await manager.stop();
+});
+
+// ─── Events ───
+
+tap.test('should emit started + completed on successful trigger', async () => {
+  const events: ITaskEvent[] = [];
+  const task = new taskbuffer.Task({
+    name: 'event-success-task',
+    taskFunction: async () => 'ok',
+  });
+
+  task.eventSubject.subscribe((e) => events.push(e));
+  await task.trigger();
+
+  expect(events.length).toEqual(2);
+  expect(events[0].type).toEqual('started');
+  expect(events[1].type).toEqual('completed');
+  expect(events[0].task.name).toEqual('event-success-task');
+  expect(typeof events[0].timestamp).toEqual('number');
+});
+
+tap.test('should emit step events on notifyStep', async () => {
+  const steps = [
+    { name: 'build', description: 'Build artifacts', percentage: 50 },
+    { name: 'deploy', description: 'Deploy to prod', percentage: 50 },
+  ] as const;
+
+  const events: ITaskEvent[] = [];
+  const task = new taskbuffer.Task({
+    name: 'step-event-task',
+    steps,
+    taskFunction: async () => {
+      task.notifyStep('build');
+      task.notifyStep('deploy');
+      return 'done';
+    },
+  });
+
+  task.eventSubject.subscribe((e) => events.push(e));
+  await task.trigger();
+
+  const stepEvents = events.filter((e) => e.type === 'step');
+  expect(stepEvents.length).toEqual(2);
+  expect(stepEvents[0].stepName).toEqual('build');
+  expect(stepEvents[1].stepName).toEqual('deploy');
+});
+
+tap.test('should emit started + failed on error', async () => {
+  const events: ITaskEvent[] = [];
+  const task = new taskbuffer.Task({
+    name: 'event-fail-task',
+    taskFunction: async () => {
+      throw new Error('boom');
+    },
+  });
+
+  task.eventSubject.subscribe((e) => events.push(e));
+
+  try {
+    await task.trigger();
+  } catch {
+    // expected
+  }
+
+  expect(events.length).toEqual(2);
+  expect(events[0].type).toEqual('started');
+  expect(events[1].type).toEqual('failed');
+  expect(events[1].error).toEqual('boom');
+});
+
+tap.test('should emit failed via done.then path when catchErrors is true', async () => {
+  const events: ITaskEvent[] = [];
+  const task = new taskbuffer.Task({
+    name: 'event-catch-fail-task',
+    catchErrors: true,
+    taskFunction: async () => {
+      throw new Error('swallowed');
+    },
+  });
+
+  task.eventSubject.subscribe((e) => events.push(e));
+  await task.trigger();
+
+  const types = events.map((e) => e.type);
+  expect(types).toContain('started');
+  expect(types).toContain('failed');
+});
+
+tap.test('TaskManager.taskSubject should aggregate events from added tasks', async () => {
+  const manager = new taskbuffer.TaskManager();
+  const events: ITaskEvent[] = [];
+
+  const t1 = new taskbuffer.Task({
+    name: 'agg-task-1',
+    taskFunction: async () => 'a',
+  });
+  const t2 = new taskbuffer.Task({
+    name: 'agg-task-2',
+    taskFunction: async () => 'b',
+  });
+
+  manager.addTask(t1);
+  manager.addTask(t2);
+
+  manager.taskSubject.subscribe((e) => events.push(e));
+
+  await t1.trigger();
+  await t2.trigger();
+
+  const names = [...new Set(events.map((e) => e.task.name))];
+  expect(names.sort()).toEqual(['agg-task-1', 'agg-task-2']);
+  expect(events.filter((e) => e.type === 'started').length).toEqual(2);
+  expect(events.filter((e) => e.type === 'completed').length).toEqual(2);
+
+  await manager.stop();
+});
+
+tap.test('events should stop after removeTask', async () => {
+  const manager = new taskbuffer.TaskManager();
+  const events: ITaskEvent[] = [];
+
+  const task = new taskbuffer.Task({
+    name: 'removable-event-task',
+    taskFunction: async () => 'ok',
+  });
+
+  manager.addTask(task);
+  manager.taskSubject.subscribe((e) => events.push(e));
+
+  await task.trigger();
+  const countBefore = events.length;
+  expect(countBefore).toBeGreaterThan(0);
+
+  manager.removeTask(task);
+
+  // Trigger again — events should NOT appear on manager subject
+  await task.trigger();
+  expect(events.length).toEqual(countBefore);
+
+  await manager.stop();
+});
+
+tap.test('event metadata snapshots should include correct labels', async () => {
+  const events: ITaskEvent[] = [];
+  const task = new taskbuffer.Task({
+    name: 'labelled-event-task',
+    taskFunction: async () => 'ok',
+    labels: { team: 'platform' },
+  });
+
+  task.eventSubject.subscribe((e) => events.push(e));
+  await task.trigger();
+
+  for (const e of events) {
+    expect(e.task.labels).toEqual({ team: 'platform' });
+  }
+});
+
+export default tap.start();

ts/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/taskbuffer',
-  version: '4.0.0',
+  version: '4.1.0',
   description: 'A flexible task management library supporting TypeScript, allowing for task buffering, scheduling, and execution with dependency management.'
 }

ts/index.ts

@@ -12,7 +12,7 @@ export { TaskStep } from './taskbuffer.classes.taskstep.js';
 export type { ITaskStep } from './taskbuffer.classes.taskstep.js';
 
 // Metadata interfaces
-export type { ITaskMetadata, ITaskExecutionReport, IScheduledTaskInfo } from './taskbuffer.interfaces.js';
+export type { ITaskMetadata, ITaskExecutionReport, IScheduledTaskInfo, ITaskEvent, TTaskEventType } from './taskbuffer.interfaces.js';
 
 import * as distributedCoordination from './taskbuffer.classes.distributedcoordinator.js';
 export { distributedCoordination };

ts/taskbuffer.classes.task.ts

@@ -2,7 +2,7 @@ import * as plugins from './taskbuffer.plugins.js';
 import { BufferRunner } from './taskbuffer.classes.bufferrunner.js';
 import { CycleCounter } from './taskbuffer.classes.cyclecounter.js';
 import { TaskStep, type ITaskStep } from './taskbuffer.classes.taskstep.js';
-import type { ITaskMetadata } from './taskbuffer.interfaces.js';
+import type { ITaskMetadata, ITaskEvent, TTaskEventType } from './taskbuffer.interfaces.js';
 
 import { logger } from './taskbuffer.logging.js';
 
@@ -91,6 +91,7 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
     // Reset steps and error state at the beginning of task execution
     taskToRun.resetSteps();
     taskToRun.lastError = undefined;
+    taskToRun.emitEvent('started');
 
     done.promise
       .then(async () => {
@@ -98,6 +99,7 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
 
         // Complete all steps when task finishes
         taskToRun.completeAllSteps();
+        taskToRun.emitEvent(taskToRun.lastError ? 'failed' : 'completed');
 
         // When the task has finished running, resolve the finished promise
         taskToRun.resolveFinished();
@@ -109,6 +111,7 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
       })
       .catch((err) => {
         taskToRun.running = false;
+        taskToRun.emitEvent('failed', { error: err instanceof Error ? err.message : String(err) });
 
         // Resolve finished so blocking dependants don't hang
         taskToRun.resolveFinished();
@@ -218,6 +221,8 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
   public catchErrors: boolean = false;
   public lastError?: Error;
   public errorCount: number = 0;
+  public labels: Record<string, string> = {};
+  public readonly eventSubject = new plugins.smartrx.rxjs.Subject<ITaskEvent>();
 
   public get idle() {
     return !this.running;
@@ -227,6 +232,38 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
     this.lastError = undefined;
   }
 
+  public setLabel(key: string, value: string): void {
+    this.labels[key] = value;
+  }
+
+  public getLabel(key: string): string | undefined {
+    return this.labels[key];
+  }
+
+  public removeLabel(key: string): boolean {
+    if (key in this.labels) {
+      delete this.labels[key];
+      return true;
+    }
+    return false;
+  }
+
+  public hasLabel(key: string, value?: string): boolean {
+    if (value !== undefined) {
+      return this.labels[key] === value;
+    }
+    return key in this.labels;
+  }
+
+  private emitEvent(type: TTaskEventType, extra?: Partial<ITaskEvent>): void {
+    this.eventSubject.next({
+      type,
+      task: this.getMetadata(),
+      timestamp: Date.now(),
+      ...extra,
+    });
+  }
+
   public taskSetup: ITaskSetupFunction<T>;
   public setupValue: T;
 
@@ -247,6 +284,7 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
     taskSetup?: ITaskSetupFunction<T>;
     steps?: TSteps;
     catchErrors?: boolean;
+    labels?: Record<string, string>;
   }) {
     this.taskFunction = optionsArg.taskFunction;
     this.preTask = optionsArg.preTask;
@@ -257,6 +295,7 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
     this.name = optionsArg.name;
     this.taskSetup = optionsArg.taskSetup;
     this.catchErrors = optionsArg.catchErrors ?? false;
+    this.labels = optionsArg.labels ? { ...optionsArg.labels } : {};
 
     // Initialize steps if provided
     if (optionsArg.steps) {
@@ -309,8 +348,8 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
     if (step) {
       step.start();
       this.currentStepName = stepName as string;
+      this.emitEvent('step', { stepName: stepName as string });
 
-      // Emit event for frontend updates (could be enhanced with event emitter)
       if (this.name) {
         logger.log('info', `Task ${this.name}: Starting step "${stepName}" - ${step.description}`);
       }
@@ -369,6 +408,7 @@ export class Task<T = undefined, TSteps extends ReadonlyArray<{ name: string; de
       cronSchedule: this.cronJob?.cronExpression,
       lastError: this.lastError?.message,
       errorCount: this.errorCount,
+      labels: { ...this.labels },
     };
   }
 

ts/taskbuffer.classes.taskmanager.ts

@@ -4,7 +4,7 @@ import {
   AbstractDistributedCoordinator,
   type IDistributedTaskRequestResult,
 } from './taskbuffer.classes.distributedcoordinator.js';
-import type { ITaskMetadata, ITaskExecutionReport, IScheduledTaskInfo } from './taskbuffer.interfaces.js';
+import type { ITaskMetadata, ITaskExecutionReport, IScheduledTaskInfo, ITaskEvent } from './taskbuffer.interfaces.js';
 import { logger } from './taskbuffer.logging.js';
 
 export interface ICronJob {
@@ -20,6 +20,8 @@ export interface ITaskManagerConstructorOptions {
 export class TaskManager {
   public randomId = plugins.smartunique.shortId();
   public taskMap = new plugins.lik.ObjectMap<Task<any, any>>();
+  public readonly taskSubject = new plugins.smartrx.rxjs.Subject<ITaskEvent>();
+  private taskSubscriptions = new Map<Task<any, any>, plugins.smartrx.rxjs.Subscription>();
   private cronJobManager = new plugins.smarttime.CronManager();
   public options: ITaskManagerConstructorOptions = {
     distributedCoordinator: null,
@@ -38,6 +40,19 @@ export class TaskManager {
       throw new Error('Task must have a name to be added to taskManager');
     }
     this.taskMap.add(task);
+    const subscription = task.eventSubject.subscribe((event) => {
+      this.taskSubject.next(event);
+    });
+    this.taskSubscriptions.set(task, subscription);
+  }
+
+  public removeTask(task: Task<any, any>): void {
+    this.taskMap.remove(task);
+    const subscription = this.taskSubscriptions.get(task);
+    if (subscription) {
+      subscription.unsubscribe();
+      this.taskSubscriptions.delete(task);
+    }
   }
 
   public addAndScheduleTask(task: Task<any, any>, cronString: string) {
@@ -150,6 +165,10 @@ export class TaskManager {
     if (this.options.distributedCoordinator) {
       await this.options.distributedCoordinator.stop();
     }
+    for (const [, subscription] of this.taskSubscriptions) {
+      subscription.unsubscribe();
+    }
+    this.taskSubscriptions.clear();
   }
 
   // Get metadata for a specific task
@@ -198,6 +217,14 @@ export class TaskManager {
     return scheduledRuns;
   }
 
+  public getTasksByLabel(key: string, value: string): Task<any, any>[] {
+    return this.taskMap.getArray().filter(task => task.labels[key] === value);
+  }
+
+  public getTasksMetadataByLabel(key: string, value: string): ITaskMetadata[] {
+    return this.getTasksByLabel(key, value).map(task => task.getMetadata());
+  }
+
   // Add, execute, and remove a task while collecting metadata
   public async addExecuteRemoveTask<T, TSteps extends ReadonlyArray<{ name: string; description: string; percentage: number }>>(
     task: Task<T, TSteps>,
@@ -236,7 +263,7 @@ export class TaskManager {
       };
       
       // Remove task from manager
-      this.taskMap.remove(task);
+      this.removeTask(task);
       
       // Deschedule if it was scheduled
       if (options?.schedule && task.name) {
@@ -260,7 +287,7 @@ export class TaskManager {
       };
       
       // Remove task from manager even on error
-      this.taskMap.remove(task);
+      this.removeTask(task);
       
       // Deschedule if it was scheduled
       if (options?.schedule && task.name) {

ts/taskbuffer.interfaces.ts

@@ -17,6 +17,7 @@ export interface ITaskMetadata {
   timeout?: number;
   lastError?: string;
   errorCount?: number;
+  labels?: Record<string, string>;
 }
 
 export interface ITaskExecutionReport {
@@ -39,3 +40,13 @@ export interface IScheduledTaskInfo {
   steps?: ITaskStep[];
   metadata?: ITaskMetadata;
 }
+
+export type TTaskEventType = 'started' | 'step' | 'completed' | 'failed';
+
+export interface ITaskEvent {
+  type: TTaskEventType;
+  task: ITaskMetadata;
+  timestamp: number;
+  stepName?: string;   // present when type === 'step'
+  error?: string;      // present when type === 'failed'
+}

ts_web/00_commitinfo_data.ts

@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@push.rocks/taskbuffer',
-  version: '4.0.0',
+  version: '4.1.0',
   description: 'A flexible task management library supporting TypeScript, allowing for task buffering, scheduling, and execution with dependency management.'
 }