hypershield/dist/src/domains/metrics/application/metricsService.js

Middleware suite for high-performance and resilient APIs

"use strict";
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}));
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    Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
    o["default"] = v;
});
var __importStar = (this && this.__importStar) || (function () {
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        ownKeys = Object.getOwnPropertyNames || function (o) {
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.globalMetrics = exports.MetricsService = void 0;
const promClient = __importStar(require("prom-client"));
class MetricsService {
    constructor() {
        this.registry = new promClient.Registry();
        this.metrics = new Map();
        this.initializeDefaultMetrics();
    }
    initializeDefaultMetrics() {
        promClient.collectDefaultMetrics({
            register: this.registry
        });
        this.createCounter('http_requests_total', 'Total number of HTTP requests', ['method', 'path', 'status']);
        this.createHistogram('http_request_duration_ms', 'HTTP request duration in milliseconds', ['method', 'path']);
        this.createCounter('cache_hits_total', 'Total number of cache hits', ['cache_type']);
        this.createCounter('cache_misses_total', 'Total number of cache misses', ['cache_type']);
        this.createCounter('compression_bytes_total', 'Total bytes before/after compression', ['stage']);
        this.createHistogram('compression_ratio', 'Compression ratio distribution');
    }
    createCounter(name, help, labelNames = []) {
        const counter = new promClient.Counter({
            name,
            help,
            labelNames,
            registers: [this.registry]
        });
        this.metrics.set(name, counter);
    }
    createHistogram(name, help, labelNames = [], buckets = promClient.linearBuckets(0, 100, 20)) {
        const histogram = new promClient.Histogram({
            name,
            help,
            labelNames,
            buckets,
            registers: [this.registry]
        });
        this.metrics.set(name, histogram);
    }
    incrementCounter(name, labels = {}) {
        const metric = this.metrics.get(name);
        if (metric && metric instanceof promClient.Counter) {
            metric.inc(labels);
        }
        else {
            throw new Error(`Counter metric '${name}' not found`);
        }
    }
    recordDuration(name, duration, labels = {}) {
        const metric = this.metrics.get(name);
        if (metric && metric instanceof promClient.Histogram) {
            metric.observe(labels, duration);
        }
        else {
            throw new Error(`Histogram metric '${name}' not found`);
        }
    }
    getMetrics() {
        return __awaiter(this, void 0, void 0, function* () {
            return yield this.registry.metrics();
        });
    }
    clearMetrics() {
        this.registry.clear();
    }
    getRegistry() {
        return this.registry;
    }
}
exports.MetricsService = MetricsService;
exports.globalMetrics = new MetricsService();
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