All files / src/platform/workers worker.service.ts

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import {
  Injectable,
  Logger,
  OnApplicationBootstrap,
  OnApplicationShutdown,
} from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { WorkerNode, WorkerJob } from './schemas/worker.schema';
import { EventBusService } from '../events/event-bus.service';
import * as os from 'os';
 
@Injectable()
export class WorkerService
  implements OnApplicationBootstrap, OnApplicationShutdown
{
  private readonly logger = new Logger(WorkerService.name);
  private nodeId: string;
  private heartbeatInterval: NodeJS.Timeout;
 
  constructor(
    @InjectModel(WorkerNode.name) private workerNodeModel: Model<WorkerNode>,
    @InjectModel(WorkerJob.name) private workerJobModel: Model<WorkerJob>,
    private readonly eventBus: EventBusService,
  ) {
    this.nodeId = `worker-${os.hostname()}-${process.pid}`;
  }
 
  async onApplicationBootstrap() {
    this.logger.log(`Registering worker node: ${this.nodeId}`);
    await this.registerNode();
    this.startHeartbeat();
  }
 
  async onApplicationShutdown(signal?: string) {
    this.logger.log(
      `Shutting down worker node: ${this.nodeId} (signal: ${signal})`,
    );
    this.stopHeartbeat();
    await this.deregisterNode();
  }
 
  private async registerNode() {
    try {
      await this.workerNodeModel.findOneAndUpdate(
        { nodeId: this.nodeId },
        {
          hostname: os.hostname(),
          status: 'active',
          queues: ['default', 'import', 'export', 'notifications'], // Make configurable later
          concurrency: 10,
          lastHeartbeatAt: new Date(),
          metrics: this.getSystemMetrics(),
        },
        { upsert: true, new: true },
      );
    } catch (error) {
      this.logger.error(
        `Failed to register worker node: ${error.message}`,
        error.stack,
      );
    }
  }
 
  private async deregisterNode() {
    try {
      await this.workerNodeModel.findOneAndUpdate(
        { nodeId: this.nodeId },
        { status: 'offline' },
      );
    } catch (error) {
      this.logger.error(
        `Failed to deregister worker node: ${error.message}`,
        error.stack,
      );
    }
  }
 
  private startHeartbeat() {
    this.heartbeatInterval = setInterval(async () => {
      try {
        await this.workerNodeModel.updateOne(
          { nodeId: this.nodeId },
          {
            lastHeartbeatAt: new Date(),
            metrics: this.getSystemMetrics(),
          },
        );
      } catch (error) {
        this.logger.error(`Failed to send heartbeat: ${error.message}`);
      }
    }, 30000); // 30 seconds
  }
 
  private stopHeartbeat() {
    if (this.heartbeatInterval) {
      clearInterval(this.heartbeatInterval);
    }
  }
 
  private getSystemMetrics() {
    return {
      uptime: process.uptime(),
      memory: process.memoryUsage(),
      cpuUsage: process.cpuUsage(),
      loadAvg: os.loadavg(),
    };
  }
 
  // Called by Queue consumers to track job state in DB
  async trackJobState(
    jobId: string,
    queueName: string,
    name: string,
    status: string,
    data?: any,
  ) {
    await this.workerJobModel.findOneAndUpdate(
      { jobId, queueName },
      {
        name,
        status,
        assignedNodeId: this.nodeId,
        ...(data && { data }),
        ...(status === 'active' && { startedAt: new Date() }),
        ...(status === 'completed' || status === 'failed'
          ? { finishedAt: new Date() }
          : {}),
      },
      { upsert: true, new: true },
    );
  }
 
  async updateJobProgress(
    jobId: string,
    queueName: string,
    progress: number,
    result?: any,
    failedReason?: string,
  ) {
    const update: any = { progress };
    if (result) update.result = result;
    if (failedReason) update.failedReason = failedReason;
 
    await this.workerJobModel.updateOne({ jobId, queueName }, update);
  }
 
  async getActiveNodes() {
    // Nodes that have sent heartbeat in the last 2 minutes
    const threshold = new Date(Date.now() - 2 * 60 * 1000);
    return this.workerNodeModel
      .find({
        status: 'active',
        lastHeartbeatAt: { $gte: threshold },
      })
      .exec();
  }
 
  async getJobHistory(
    queueName?: string,
    status?: string,
    limit = 50,
    skip = 0,
  ) {
    const query: any = {};
    if (queueName) query.queueName = queueName;
    if (status) query.status = status;
 
    return this.workerJobModel
      .find(query)
      .sort({ createdAt: -1 })
      .skip(skip)
      .limit(limit)
      .exec();
  }
}