@texagon/nestjs-health/dist/health/health.service.js

A comprehensive health monitoring package for NestJS applications with metrics and Kubernetes-ready health checks

"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var HealthService_1;
Object.defineProperty(exports, "__esModule", { value: true });
exports.HealthService = void 0;
const common_1 = require("@nestjs/common");
const terminus_1 = require("@nestjs/terminus");
const os = require("os");
let HealthService = HealthService_1 = class HealthService extends terminus_1.HealthIndicator {
    constructor() {
        super();
        this.logger = new common_1.Logger(HealthService_1.name);
        this.isShuttingDown = false;
        this.memoryThreshold = 0.9;
        this.cpuThreshold = 0.95;
        this.uptimeMinThreshold = 10;
        process.on("SIGTERM", () => {
            this.logger.log("SIGTERM received, marking service as unhealthy for graceful shutdown");
            this.isShuttingDown = true;
        });
    }
    async isHealthy() {
        const health = await this.checkSystemHealth();
        const isHealthy = health.serviceHealthy && (health.memoryHealthy || health.cpuHealthy);
        const result = this.getStatus("service", isHealthy, {
            version: process.env.npm_package_version || "0.0.1",
            timestamp: new Date().toISOString(),
            memoryHealthy: health.memoryHealthy,
            cpuHealthy: health.cpuHealthy,
            diskHealthy: health.diskHealthy,
        });
        if (isHealthy) {
            return result;
        }
        throw new terminus_1.HealthCheckError("Health check failed", result);
    }
    async checkSystemHealth() {
        const serviceHealthy = !this.isShuttingDown;
        const memoryUsage = process.memoryUsage();
        const totalMemory = os.totalmem();
        const memoryHealthy = memoryUsage.rss / totalMemory < this.memoryThreshold;
        const cpuLoad = os.loadavg()[0] / os.cpus().length;
        const cpuHealthy = cpuLoad < this.cpuThreshold;
        const diskHealthy = true;
        return {
            memoryHealthy,
            cpuHealthy,
            diskHealthy,
            serviceHealthy,
        };
    }
    async checkDependencies() {
        const isHealthy = true;
        return this.getStatus("dependencies", isHealthy);
    }
    async getMemoryStats() {
        const memoryUsage = process.memoryUsage();
        return this.getStatus("memory", true, {
            heapUsed: Math.round(memoryUsage.heapUsed / 1024 / 1024) + "MB",
            heapTotal: Math.round(memoryUsage.heapTotal / 1024 / 1024) + "MB",
            rss: Math.round(memoryUsage.rss / 1024 / 1024) + "MB",
        });
    }
};
exports.HealthService = HealthService;
exports.HealthService = HealthService = HealthService_1 = __decorate([
    (0, common_1.Injectable)(),
    __metadata("design:paramtypes", [])
], HealthService);
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