All files / src/platform/limit limit.service.ts

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import { Injectable, BadRequestException, Logger } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { TenantUsageCounter, UsageLimitOverride } from './schemas/limit.schema';
import { Subscription } from '../subscriptions/schemas/subscription.schema';
import { SubscriptionPlanVersion } from '../subscriptions/schemas/subscription-plan.schema';
import { EventBusService } from '../events/event-bus.service';
 
@Injectable()
export class UsageMeterService {
  private readonly logger = new Logger(UsageMeterService.name);
 
  constructor(
    @InjectModel(TenantUsageCounter.name)
    private readonly counterModel: Model<TenantUsageCounter>,
    @InjectModel(UsageLimitOverride.name)
    private readonly overrideModel: Model<UsageLimitOverride>,
    @InjectModel(Subscription.name)
    private readonly subscriptionModel: Model<Subscription>,
    @InjectModel(SubscriptionPlanVersion.name)
    private readonly versionModel: Model<SubscriptionPlanVersion>,
    private readonly eventBus: EventBusService,
  ) {}
 
  async checkLimit(
    tenantId: string,
    metricKey: string,
    increment = 1,
  ): Promise<void> {
    const counter = await this.counterModel
      .findOne({ tenantId, metricKey })
      .exec();
    const current = counter ? counter.currentValue : 0;
 
    // Resolve max allowed limits
    let maxAllowed = 0;
 
    // 1. Check overrides first
    const override = await this.overrideModel
      .findOne({
        tenantId,
        metricKey,
        expiresAt: { $gt: new Date() },
      })
      .lean()
      .exec();
 
    if (override) {
      maxAllowed = override.overrideValue;
    } else {
      // 2. Fetch default subscription limits
      const sub = await this.subscriptionModel
        .findOne({ tenantId })
        .lean()
        .exec();
      if (sub) {
        const version = await this.versionModel
          .findById(sub.planVersionId)
          .lean()
          .exec();
        if (version && version.limits) {
          maxAllowed = version.limits[metricKey] || 0;
        }
      }
    }
 
    if (current + increment > maxAllowed) {
      await this.eventBus.publish(
        'platform.usage.limit-reached.v1',
        {
          tenantId,
          metricKey,
          current: current + increment,
          limit: maxAllowed,
        },
        tenantId,
      );
 
      throw new BadRequestException(
        `Plan limit reached for: ${metricKey}. Maximum allowed: ${maxAllowed}`,
      );
    }
 
    // Trigger warning alert when reaching 80% usage
    if (maxAllowed > 0 && (current + increment) / maxAllowed >= 0.8) {
      await this.eventBus.publish(
        'platform.usage.warning.v1',
        {
          tenantId,
          metricKey,
          current: current + increment,
          limit: maxAllowed,
        },
        tenantId,
      );
    }
  }
 
  async increment(tenantId: string, metricKey: string, val = 1): Promise<any> {
    await this.checkLimit(tenantId, metricKey, val);
 
    return this.counterModel
      .findOneAndUpdate(
        { tenantId, metricKey },
        { $inc: { currentValue: val } },
        { upsert: true, new: true },
      )
      .lean()
      .exec();
  }
 
  async decrement(tenantId: string, metricKey: string, val = 1): Promise<any> {
    return this.counterModel
      .findOneAndUpdate(
        { tenantId, metricKey },
        { $inc: { currentValue: -val } },
        { upsert: true, new: true },
      )
      .lean()
      .exec();
  }
 
  async getUsage(tenantId: string): Promise<any[]> {
    return this.counterModel.find({ tenantId }).lean().exec();
  }
 
  async getLimits(tenantId: string): Promise<any> {
    const sub = await this.subscriptionModel
      .findOne({ tenantId })
      .lean()
      .exec();
    if (!sub) return {};
    const version = await this.versionModel
      .findById(sub.planVersionId)
      .lean()
      .exec();
    return version?.limits || {};
  }
 
  async setOverride(
    tenantId: string,
    metricKey: string,
    value: number,
    expiresHours = 24,
  ): Promise<any> {
    return this.overrideModel
      .findOneAndUpdate(
        { tenantId, metricKey },
        {
          tenantId,
          metricKey,
          overrideValue: value,
          expiresAt: new Date(Date.now() + expiresHours * 60 * 60 * 1000),
        },
        { upsert: true, new: true },
      )
      .lean()
      .exec();
  }
}