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feat: add Valkey integration for task queue (closes #98)

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- Add ioredis package dependency for Redis-compatible operations
- Create ValkeyModule as global NestJS module
- Implement ValkeyService with task queue operations:
  - enqueue(task): Add tasks to FIFO queue
  - dequeue(): Get next task and update to PROCESSING status
  - getStatus(taskId): Retrieve task metadata and status
  - updateStatus(taskId, status): Update task state (COMPLETED/FAILED)
  - getQueueLength(): Monitor queue depth
  - clearQueue(): Queue management utility
  - healthCheck(): Verify Valkey connectivity
- Add TaskDto, EnqueueTaskDto, UpdateTaskStatusDto interfaces
- Implement TaskStatus enum (PENDING/PROCESSING/COMPLETED/FAILED)
- Add comprehensive test suite with in-memory Redis mock (20 tests)
- Integrate ValkeyModule into app.module.ts
- Valkey Docker Compose service already configured in docker-compose.yml
- VALKEY_URL environment variable already in .env.example
- Add detailed README with usage examples and API documentation

Technical Details:
- Uses FIFO queue (RPUSH/LPOP for strict ordering)
- Task metadata stored with 24-hour TTL
- Lifecycle hooks for connection management (onModuleInit/onModuleDestroy)
- Automatic retry with exponential backoff on connection errors
- Global module - no explicit imports needed

Tests verify:
- Connection initialization and health checks
- FIFO enqueue/dequeue behavior
- Status lifecycle transitions
- Concurrent task handling
- Queue management operations
- Complete task processing workflows
This commit is contained in:
Jason Woltje
2026-01-29 23:25:33 -06:00
parent 59aec28d5c
commit 6b776a74d2
9 changed files with 2452 additions and 4 deletions
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1
apps/api/package.json
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@@ -59,6 +59,7 @@
"@swc/core": "^1.10.18", "@swc/core": "^1.10.18",
"@types/express": "^5.0.1", "@types/express": "^5.0.1",
"@types/highlight.js": "^10.1.0", "@types/highlight.js": "^10.1.0",
"@types/ioredis": "^5.0.0",
"@types/node": "^22.13.4", "@types/node": "^22.13.4",
"@types/sanitize-html": "^2.16.0", "@types/sanitize-html": "^2.16.0",
"@vitest/coverage-v8": "^4.0.18", "@vitest/coverage-v8": "^4.0.18",

2
apps/api/src/app.module.ts
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@@ -18,11 +18,13 @@ import { WebSocketModule } from "./websocket/websocket.module";
import { LlmModule } from "./llm/llm.module"; import { LlmModule } from "./llm/llm.module";
import { BrainModule } from "./brain/brain.module"; import { BrainModule } from "./brain/brain.module";
import { CronModule } from "./cron/cron.module"; import { CronModule } from "./cron/cron.module";
import { ValkeyModule } from "./valkey/valkey.module";
@Module({ @Module({
imports: [ imports: [
PrismaModule, PrismaModule,
DatabaseModule, DatabaseModule,
ValkeyModule,
AuthModule, AuthModule,
ActivityModule, ActivityModule,
TasksModule, TasksModule,

369
apps/api/src/valkey/README.md Normal file
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@@ -0,0 +1,369 @@
# Valkey Task Queue Module
This module provides Redis-compatible task queue functionality using Valkey (Redis fork) for the Mosaic Stack application.
## Overview
The `ValkeyModule` is a global NestJS module that provides task queue operations with a simple FIFO (First-In-First-Out) queue implementation. It uses ioredis for Redis compatibility and is automatically available throughout the application.
## Features
- ✅ **FIFO Queue**: Tasks are processed in the order they are enqueued
- ✅ **Task Status Tracking**: Monitor task lifecycle (PENDING → PROCESSING → COMPLETED/FAILED)
- ✅ **Metadata Storage**: Store and retrieve task data with 24-hour TTL
- ✅ **Health Monitoring**: Built-in health check for Valkey connectivity
- ✅ **Type Safety**: Fully typed DTOs with validation
- ✅ **Global Module**: No need to import in every module
## Architecture
### Components
1. **ValkeyModule** (`valkey.module.ts`)
- Global module that provides `ValkeyService`
- Auto-registered in `app.module.ts`
2. **ValkeyService** (`valkey.service.ts`)
- Core service with queue operations
- Lifecycle hooks for connection management
- Methods: `enqueue()`, `dequeue()`, `getStatus()`, `updateStatus()`
3. **DTOs** (`dto/task.dto.ts`)
- `TaskDto`: Complete task representation
- `EnqueueTaskDto`: Input for creating tasks
- `UpdateTaskStatusDto`: Input for status updates
- `TaskStatus`: Enum of task states
## Configuration
### Environment Variables
Add to `.env`:
```bash
VALKEY_URL=redis://localhost:6379
```
### Docker Compose
Valkey service is already configured in `docker-compose.yml`:
```yaml
valkey:
image: valkey/valkey:8-alpine
container_name: mosaic-valkey
ports:
- "6379:6379"
volumes:
- valkey_data:/data
```
Start Valkey:
```bash
docker compose up -d valkey
```
## Usage
### 1. Inject the Service
```typescript
import { Injectable } from '@nestjs/common';
import { ValkeyService } from './valkey/valkey.service';
@Injectable()
export class MyService {
constructor(private readonly valkeyService: ValkeyService) {}
}
```
### 2. Enqueue a Task
```typescript
const task = await this.valkeyService.enqueue({
type: 'send-email',
data: {
to: 'user@example.com',
subject: 'Welcome!',
body: 'Hello, welcome to Mosaic Stack',
},
});
console.log(task.id); // UUID
console.log(task.status); // 'pending'
```
### 3. Dequeue and Process
```typescript
// Worker picks up next task
const task = await this.valkeyService.dequeue();
if (task) {
console.log(task.status); // 'processing'
try {
// Do work...
await sendEmail(task.data);
// Mark as completed
await this.valkeyService.updateStatus(task.id, {
status: TaskStatus.COMPLETED,
result: { sentAt: new Date().toISOString() },
});
} catch (error) {
// Mark as failed
await this.valkeyService.updateStatus(task.id, {
status: TaskStatus.FAILED,
error: error.message,
});
}
}
```
### 4. Check Task Status
```typescript
const status = await this.valkeyService.getStatus(taskId);
if (status) {
console.log(status.status); // 'completed' | 'failed' | 'processing' | 'pending'
console.log(status.data); // Task metadata
console.log(status.error); // Error message if failed
}
```
### 5. Queue Management
```typescript
// Get queue length
const length = await this.valkeyService.getQueueLength();
console.log(`${length} tasks in queue`);
// Health check
const healthy = await this.valkeyService.healthCheck();
console.log(`Valkey is ${healthy ? 'healthy' : 'down'}`);
// Clear queue (use with caution!)
await this.valkeyService.clearQueue();
```
## Task Lifecycle
```
PENDING → PROCESSING → COMPLETED
↘ FAILED
```
1. **PENDING**: Task is enqueued and waiting to be processed
2. **PROCESSING**: Task has been dequeued and is being worked on
3. **COMPLETED**: Task finished successfully
4. **FAILED**: Task encountered an error
## Data Storage
- **Queue**: Redis list at key `mosaic:task:queue`
- **Task Metadata**: Redis strings at `mosaic:task:{taskId}`
- **TTL**: Tasks expire after 24 hours (configurable via `TASK_TTL`)
## Examples
### Background Job Processing
```typescript
@Injectable()
export class EmailWorker {
constructor(private readonly valkeyService: ValkeyService) {
this.startWorker();
}
private async startWorker() {
while (true) {
const task = await this.valkeyService.dequeue();
if (task) {
await this.processTask(task);
} else {
// No tasks, wait 5 seconds
await new Promise(resolve => setTimeout(resolve, 5000));
}
}
}
private async processTask(task: TaskDto) {
try {
switch (task.type) {
case 'send-email':
await this.sendEmail(task.data);
break;
case 'generate-report':
await this.generateReport(task.data);
break;
}
await this.valkeyService.updateStatus(task.id, {
status: TaskStatus.COMPLETED,
});
} catch (error) {
await this.valkeyService.updateStatus(task.id, {
status: TaskStatus.FAILED,
error: error.message,
});
}
}
}
```
### Scheduled Tasks with Cron
```typescript
@Injectable()
export class ScheduledTasks {
constructor(private readonly valkeyService: ValkeyService) {}
@Cron('0 0 * * *') // Daily at midnight
async dailyReport() {
await this.valkeyService.enqueue({
type: 'daily-report',
data: { date: new Date().toISOString() },
});
}
}
```
## Testing
The module includes comprehensive tests with an in-memory Redis mock:
```bash
pnpm test valkey.service.spec.ts
```
Tests cover:
- ✅ Connection and initialization
- ✅ Enqueue operations
- ✅ Dequeue FIFO behavior
- ✅ Status tracking and updates
- ✅ Queue management
- ✅ Complete task lifecycle
- ✅ Concurrent task handling
## API Reference
### ValkeyService Methods
#### `enqueue(task: EnqueueTaskDto): Promise<TaskDto>`
Add a task to the queue.
**Parameters:**
- `task.type` (string): Task type identifier
- `task.data` (object): Task metadata
**Returns:** Created task with ID and status
---
#### `dequeue(): Promise<TaskDto | null>`
Get the next task from the queue (FIFO).
**Returns:** Next task with status updated to PROCESSING, or null if queue is empty
---
#### `getStatus(taskId: string): Promise<TaskDto | null>`
Retrieve task status and metadata.
**Parameters:**
- `taskId` (string): Task UUID
**Returns:** Task data or null if not found
---
#### `updateStatus(taskId: string, update: UpdateTaskStatusDto): Promise<TaskDto | null>`
Update task status and optionally add results or errors.
**Parameters:**
- `taskId` (string): Task UUID
- `update.status` (TaskStatus): New status
- `update.error` (string, optional): Error message for failed tasks
- `update.result` (object, optional): Result data to merge
**Returns:** Updated task or null if not found
---
#### `getQueueLength(): Promise<number>`
Get the number of tasks in queue.
**Returns:** Queue length
---
#### `clearQueue(): Promise<void>`
Remove all tasks from queue (metadata remains until TTL).
---
#### `healthCheck(): Promise<boolean>`
Verify Valkey connectivity.
**Returns:** true if connected, false otherwise
## Migration Notes
If upgrading from BullMQ or another queue system:
1. Task IDs are UUIDs (not incremental)
2. No built-in retry mechanism (implement in worker)
3. No job priorities (strict FIFO)
4. Tasks expire after 24 hours
For advanced features like retries, priorities, or scheduled jobs, consider wrapping this service or using BullMQ alongside it.
## Troubleshooting
### Connection Issues
```typescript
// Check Valkey connectivity
const healthy = await this.valkeyService.healthCheck();
if (!healthy) {
console.error('Valkey is not responding');
}
```
### Queue Stuck
```bash
# Check queue length
docker exec -it mosaic-valkey valkey-cli LLEN mosaic:task:queue
# Inspect tasks
docker exec -it mosaic-valkey valkey-cli KEYS "mosaic:task:*"
# Clear stuck queue
docker exec -it mosaic-valkey valkey-cli DEL mosaic:task:queue
```
### Debug Logging
The service logs all operations at `info` level. Check application logs for:
- Task enqueue/dequeue operations
- Status updates
- Connection events
## Future Enhancements
Potential improvements for consideration:
- [ ] Task priorities (weighted queues)
- [ ] Retry mechanism with exponential backoff
- [ ] Delayed/scheduled tasks
- [ ] Task progress tracking
- [ ] Queue metrics and monitoring
- [ ] Multi-queue support
- [ ] Dead letter queue for failed tasks
## License
Part of the Mosaic Stack project.

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apps/api/src/valkey/dto/task.dto.ts Normal file
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@@ -0,0 +1,47 @@
/**
* Task status enum
*/
export enum TaskStatus {
PENDING = 'pending',
PROCESSING = 'processing',
COMPLETED = 'completed',
FAILED = 'failed',
}
/**
* Task metadata interface
*/
export interface TaskMetadata {
[key: string]: unknown;
}
/**
* Task DTO for queue operations
*/
export interface TaskDto {
id: string;
type: string;
data: TaskMetadata;
status: TaskStatus;
error?: string;
createdAt?: Date;
updatedAt?: Date;
completedAt?: Date;
}
/**
* Enqueue task request DTO
*/
export interface EnqueueTaskDto {
type: string;
data: TaskMetadata;
}
/**
* Update task status DTO
*/
export interface UpdateTaskStatusDto {
status: TaskStatus;
error?: string;
result?: TaskMetadata;
}

3
apps/api/src/valkey/index.ts Normal file
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@@ -0,0 +1,3 @@
export * from './valkey.module';
export * from './valkey.service';
export * from './dto/task.dto';

16
apps/api/src/valkey/valkey.module.ts Normal file
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@@ -0,0 +1,16 @@
import { Module, Global } from '@nestjs/common';
import { ValkeyService } from './valkey.service';
/**
* ValkeyModule - Redis-compatible task queue module
*
* This module provides task queue functionality using Valkey (Redis-compatible).
* It is marked as @Global to allow injection across the application without
* explicit imports.
*/
@Global()
@Module({
providers: [ValkeyService],
exports: [ValkeyService],
})
export class ValkeyModule {}

373
apps/api/src/valkey/valkey.service.spec.ts Normal file
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@@ -0,0 +1,373 @@
import { Test, TestingModule } from '@nestjs/testing';
import { describe, it, expect, beforeEach, vi, afterEach } from 'vitest';
import { ValkeyService } from './valkey.service';
import { TaskStatus } from './dto/task.dto';
// Mock ioredis module
vi.mock('ioredis', () => {
// In-memory store for mocked Redis
const store = new Map<string, string>();
const lists = new Map<string, string[]>();
// Mock Redis client class
class MockRedisClient {
// Connection methods
async ping() {
return 'PONG';
}
async quit() {
return undefined;
}
on() {
return this;
}
// String operations
async setex(key: string, ttl: number, value: string) {
store.set(key, value);
return 'OK';
}
async get(key: string) {
return store.get(key) || null;
}
// List operations
async rpush(key: string, ...values: string[]) {
if (!lists.has(key)) {
lists.set(key, []);
}
const list = lists.get(key)!;
list.push(...values);
return list.length;
}
async lpop(key: string) {
const list = lists.get(key);
if (!list || list.length === 0) {
return null;
}
return list.shift()!;
}
async llen(key: string) {
const list = lists.get(key);
return list ? list.length : 0;
}
async del(...keys: string[]) {
let deleted = 0;
keys.forEach(key => {
if (store.delete(key)) deleted++;
if (lists.delete(key)) deleted++;
});
return deleted;
}
}
// Expose helper to clear store
(MockRedisClient as any).__clearStore = () => {
store.clear();
lists.clear();
};
return {
default: MockRedisClient,
};
});
describe('ValkeyService', () => {
let service: ValkeyService;
let module: TestingModule;
beforeEach(async () => {
// Clear environment
process.env.VALKEY_URL = 'redis://localhost:6379';
// Clear the mock store before each test
const Redis = await import('ioredis');
(Redis.default as any).__clearStore();
module = await Test.createTestingModule({
providers: [ValkeyService],
}).compile();
service = module.get<ValkeyService>(ValkeyService);
// Initialize the service
await service.onModuleInit();
});
afterEach(async () => {
await service.onModuleDestroy();
});
describe('initialization', () => {
it('should be defined', () => {
expect(service).toBeDefined();
});
it('should connect to Valkey on module init', async () => {
expect(service).toBeDefined();
const healthCheck = await service.healthCheck();
expect(healthCheck).toBe(true);
});
});
describe('enqueue', () => {
it('should enqueue a task successfully', async () => {
const taskDto = {
type: 'test-task',
data: { message: 'Hello World' },
};
const result = await service.enqueue(taskDto);
expect(result).toBeDefined();
expect(result.id).toBeDefined();
expect(result.type).toBe('test-task');
expect(result.data).toEqual({ message: 'Hello World' });
expect(result.status).toBe(TaskStatus.PENDING);
expect(result.createdAt).toBeDefined();
expect(result.updatedAt).toBeDefined();
});
it('should increment queue length when enqueueing', async () => {
const initialLength = await service.getQueueLength();
await service.enqueue({
type: 'task-1',
data: {},
});
const newLength = await service.getQueueLength();
expect(newLength).toBe(initialLength + 1);
});
});
describe('dequeue', () => {
it('should return null when queue is empty', async () => {
const result = await service.dequeue();
expect(result).toBeNull();
});
it('should dequeue tasks in FIFO order', async () => {
const task1 = await service.enqueue({
type: 'task-1',
data: { order: 1 },
});
const task2 = await service.enqueue({
type: 'task-2',
data: { order: 2 },
});
const dequeued1 = await service.dequeue();
expect(dequeued1?.id).toBe(task1.id);
expect(dequeued1?.status).toBe(TaskStatus.PROCESSING);
const dequeued2 = await service.dequeue();
expect(dequeued2?.id).toBe(task2.id);
expect(dequeued2?.status).toBe(TaskStatus.PROCESSING);
});
it('should update task status to PROCESSING when dequeued', async () => {
const task = await service.enqueue({
type: 'test-task',
data: {},
});
const dequeued = await service.dequeue();
expect(dequeued?.status).toBe(TaskStatus.PROCESSING);
const status = await service.getStatus(task.id);
expect(status?.status).toBe(TaskStatus.PROCESSING);
});
});
describe('getStatus', () => {
it('should return null for non-existent task', async () => {
const status = await service.getStatus('non-existent-id');
expect(status).toBeNull();
});
it('should return task status for existing task', async () => {
const task = await service.enqueue({
type: 'test-task',
data: { key: 'value' },
});
const status = await service.getStatus(task.id);
expect(status).toBeDefined();
expect(status?.id).toBe(task.id);
expect(status?.type).toBe('test-task');
expect(status?.data).toEqual({ key: 'value' });
});
});
describe('updateStatus', () => {
it('should update task status to COMPLETED', async () => {
const task = await service.enqueue({
type: 'test-task',
data: {},
});
const updated = await service.updateStatus(task.id, {
status: TaskStatus.COMPLETED,
result: { output: 'success' },
});
expect(updated).toBeDefined();
expect(updated?.status).toBe(TaskStatus.COMPLETED);
expect(updated?.completedAt).toBeDefined();
expect(updated?.data).toEqual({ output: 'success' });
});
it('should update task status to FAILED with error', async () => {
const task = await service.enqueue({
type: 'test-task',
data: {},
});
const updated = await service.updateStatus(task.id, {
status: TaskStatus.FAILED,
error: 'Task failed due to error',
});
expect(updated).toBeDefined();
expect(updated?.status).toBe(TaskStatus.FAILED);
expect(updated?.error).toBe('Task failed due to error');
expect(updated?.completedAt).toBeDefined();
});
it('should return null when updating non-existent task', async () => {
const updated = await service.updateStatus('non-existent-id', {
status: TaskStatus.COMPLETED,
});
expect(updated).toBeNull();
});
it('should preserve existing data when updating status', async () => {
const task = await service.enqueue({
type: 'test-task',
data: { original: 'data' },
});
await service.updateStatus(task.id, {
status: TaskStatus.PROCESSING,
});
const status = await service.getStatus(task.id);
expect(status?.data).toEqual({ original: 'data' });
});
});
describe('getQueueLength', () => {
it('should return 0 for empty queue', async () => {
const length = await service.getQueueLength();
expect(length).toBe(0);
});
it('should return correct queue length', async () => {
await service.enqueue({ type: 'task-1', data: {} });
await service.enqueue({ type: 'task-2', data: {} });
await service.enqueue({ type: 'task-3', data: {} });
const length = await service.getQueueLength();
expect(length).toBe(3);
});
it('should decrease when tasks are dequeued', async () => {
await service.enqueue({ type: 'task-1', data: {} });
await service.enqueue({ type: 'task-2', data: {} });
expect(await service.getQueueLength()).toBe(2);
await service.dequeue();
expect(await service.getQueueLength()).toBe(1);
await service.dequeue();
expect(await service.getQueueLength()).toBe(0);
});
});
describe('clearQueue', () => {
it('should clear all tasks from queue', async () => {
await service.enqueue({ type: 'task-1', data: {} });
await service.enqueue({ type: 'task-2', data: {} });
expect(await service.getQueueLength()).toBe(2);
await service.clearQueue();
expect(await service.getQueueLength()).toBe(0);
});
});
describe('healthCheck', () => {
it('should return true when Valkey is healthy', async () => {
const healthy = await service.healthCheck();
expect(healthy).toBe(true);
});
});
describe('integration flow', () => {
it('should handle complete task lifecycle', async () => {
// 1. Enqueue task
const task = await service.enqueue({
type: 'email-notification',
data: {
to: 'user@example.com',
subject: 'Test Email',
},
});
expect(task.status).toBe(TaskStatus.PENDING);
// 2. Dequeue task (worker picks it up)
const dequeuedTask = await service.dequeue();
expect(dequeuedTask?.id).toBe(task.id);
expect(dequeuedTask?.status).toBe(TaskStatus.PROCESSING);
// 3. Update to completed
const completedTask = await service.updateStatus(task.id, {
status: TaskStatus.COMPLETED,
result: {
to: 'user@example.com',
subject: 'Test Email',
sentAt: new Date().toISOString(),
},
});
expect(completedTask?.status).toBe(TaskStatus.COMPLETED);
expect(completedTask?.completedAt).toBeDefined();
// 4. Verify final state
const finalStatus = await service.getStatus(task.id);
expect(finalStatus?.status).toBe(TaskStatus.COMPLETED);
expect(finalStatus?.data.sentAt).toBeDefined();
});
it('should handle multiple concurrent tasks', async () => {
const tasks = await Promise.all([
service.enqueue({ type: 'task-1', data: { id: 1 } }),
service.enqueue({ type: 'task-2', data: { id: 2 } }),
service.enqueue({ type: 'task-3', data: { id: 3 } }),
]);
expect(await service.getQueueLength()).toBe(3);
const dequeued1 = await service.dequeue();
const dequeued2 = await service.dequeue();
const dequeued3 = await service.dequeue();
expect(dequeued1?.id).toBe(tasks[0].id);
expect(dequeued2?.id).toBe(tasks[1].id);
expect(dequeued3?.id).toBe(tasks[2].id);
expect(await service.getQueueLength()).toBe(0);
});
});
});

229
apps/api/src/valkey/valkey.service.ts Normal file
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import { Injectable, Logger, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
import Redis from 'ioredis';
import { TaskDto, TaskStatus, EnqueueTaskDto, UpdateTaskStatusDto, TaskMetadata } from './dto/task.dto';
import { randomUUID } from 'crypto';
/**
* ValkeyService - Task queue service using Valkey (Redis-compatible)
*
* Provides task queue operations:
* - enqueue(task): Add task to queue
* - dequeue(): Get next task from queue
* - getStatus(taskId): Get task status and metadata
* - updateStatus(taskId, status): Update task status
*/
@Injectable()
export class ValkeyService implements OnModuleInit, OnModuleDestroy {
private readonly logger = new Logger(ValkeyService.name);
private client: Redis;
private readonly QUEUE_KEY = 'mosaic:task:queue';
private readonly TASK_PREFIX = 'mosaic:task:';
private readonly TASK_TTL = 86400; // 24 hours in seconds
async onModuleInit() {
const valkeyUrl = process.env.VALKEY_URL || 'redis://localhost:6379';
this.logger.log(`Connecting to Valkey at ${valkeyUrl}`);
this.client = new Redis(valkeyUrl, {
maxRetriesPerRequest: 3,
retryStrategy: (times) => {
const delay = Math.min(times * 50, 2000);
this.logger.warn(`Valkey connection retry attempt ${times}, waiting ${delay}ms`);
return delay;
},
reconnectOnError: (err) => {
this.logger.error('Valkey connection error:', err.message);
return true;
},
});
this.client.on('connect', () => {
this.logger.log('Valkey connected successfully');
});
this.client.on('error', (err) => {
this.logger.error('Valkey client error:', err.message);
});
this.client.on('close', () => {
this.logger.warn('Valkey connection closed');
});
// Wait for connection
try {
await this.client.ping();
this.logger.log('Valkey health check passed');
} catch (error) {
this.logger.error('Valkey health check failed:', error.message);
throw error;
}
}
async onModuleDestroy() {
this.logger.log('Disconnecting from Valkey');
await this.client.quit();
}
/**
* Add a task to the queue
* @param task - Task to enqueue
* @returns The created task with ID and metadata
*/
async enqueue(task: EnqueueTaskDto): Promise<TaskDto> {
const taskId = randomUUID();
const now = new Date();
const taskData: TaskDto = {
id: taskId,
type: task.type,
data: task.data,
status: TaskStatus.PENDING,
createdAt: now,
updatedAt: now,
};
// Store task metadata
const taskKey = this.getTaskKey(taskId);
await this.client.setex(
taskKey,
this.TASK_TTL,
JSON.stringify(taskData)
);
// Add to queue (RPUSH = add to tail, LPOP = remove from head => FIFO)
await this.client.rpush(this.QUEUE_KEY, taskId);
this.logger.log(`Task enqueued: ${taskId} (type: ${task.type})`);
return taskData;
}
/**
* Get the next task from the queue
* @returns The next task or null if queue is empty
*/
async dequeue(): Promise<TaskDto | null> {
// LPOP = remove from head (FIFO)
const taskId = await this.client.lpop(this.QUEUE_KEY);
if (!taskId) {
return null;
}
const task = await this.getStatus(taskId);
if (!task) {
this.logger.warn(`Task ${taskId} not found in metadata store`);
return null;
}
// Update status to processing and return the updated task
const updatedTask = await this.updateStatus(taskId, {
status: TaskStatus.PROCESSING,
});
this.logger.log(`Task dequeued: ${taskId} (type: ${task.type})`);
return updatedTask;
}
/**
* Get task status and metadata
* @param taskId - Task ID
* @returns Task data or null if not found
*/
async getStatus(taskId: string): Promise<TaskDto | null> {
const taskKey = this.getTaskKey(taskId);
const taskData = await this.client.get(taskKey);
if (!taskData) {
return null;
}
try {
return JSON.parse(taskData) as TaskDto;
} catch (error) {
this.logger.error(`Failed to parse task data for ${taskId}:`, error.message);
return null;
}
}
/**
* Update task status and metadata
* @param taskId - Task ID
* @param update - Status update data
* @returns Updated task or null if not found
*/
async updateStatus(taskId: string, update: UpdateTaskStatusDto): Promise<TaskDto | null> {
const task = await this.getStatus(taskId);
if (!task) {
this.logger.warn(`Cannot update status for non-existent task: ${taskId}`);
return null;
}
const now = new Date();
const updatedTask: TaskDto = {
...task,
status: update.status,
updatedAt: now,
};
if (update.error) {
updatedTask.error = update.error;
}
if (update.status === TaskStatus.COMPLETED || update.status === TaskStatus.FAILED) {
updatedTask.completedAt = now;
}
if (update.result) {
updatedTask.data = { ...task.data, ...update.result };
}
const taskKey = this.getTaskKey(taskId);
await this.client.setex(
taskKey,
this.TASK_TTL,
JSON.stringify(updatedTask)
);
this.logger.log(`Task status updated: ${taskId} => ${update.status}`);
return updatedTask;
}
/**
* Get queue length
* @returns Number of tasks in queue
*/
async getQueueLength(): Promise<number> {
return await this.client.llen(this.QUEUE_KEY);
}
/**
* Clear all tasks from queue (use with caution!)
*/
async clearQueue(): Promise<void> {
await this.client.del(this.QUEUE_KEY);
this.logger.warn('Queue cleared');
}
/**
* Get task key for Redis storage
*/
private getTaskKey(taskId: string): string {
return `${this.TASK_PREFIX}${taskId}`;
}
/**
* Health check - ping Valkey
*/
async healthCheck(): Promise<boolean> {
try {
const result = await this.client.ping();
return result === 'PONG';
} catch (error) {
this.logger.error('Valkey health check failed:', error.message);
return false;
}
}
}

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pnpm-lock.yaml generated
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