@merncloud/nodejs-monitoring/dist/collectors/RequestTracker.js

A comprehensive monitoring service for Node.js applications with built-in health probes and metrics collection

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.RequestTracker = void 0;
class RequestTracker {
    constructor() {
        this.totalRequests = 0;
        this.activeRequests = 0;
        this.totalResponseTime = 0;
        this.errors = 0;
        this.requestTimes = [];
        this.errorTimes = [];
    }
    static getInstance() {
        if (!RequestTracker.instance) {
            RequestTracker.instance = new RequestTracker();
        }
        return RequestTracker.instance;
    }
    startRequest() {
        this.totalRequests++;
        this.activeRequests++;
        return `req_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    }
    endRequest(requestId, startTime) {
        this.activeRequests--;
        const responseTime = Date.now() - startTime;
        this.totalResponseTime += responseTime;
        this.requestTimes.push(responseTime);
        if (this.requestTimes.length > 100) {
            this.requestTimes.shift();
        }
    }
    recordError() {
        this.errors++;
        this.errorTimes.push(Date.now());
        if (this.errorTimes.length > 100) {
            this.errorTimes.shift();
        }
    }
    getMetrics() {
        const now = Date.now();
        const fiveMinutesAgo = now - 5 * 60 * 1000;
        const recentErrors = this.errorTimes.filter((time) => time > fiveMinutesAgo);
        return {
            total: this.totalRequests,
            active: this.activeRequests,
            averageResponseTime: this.requestTimes.length > 0
                ? Math.round(this.requestTimes.reduce((a, b) => a + b, 0) /
                    this.requestTimes.length)
                : 0,
            errors: {
                total: this.errors,
                rate: recentErrors.length / 5,
            },
        };
    }
}
exports.RequestTracker = RequestTracker;
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