@next-boost/next-boost/dist/metrics.js

Add a cache layer for next.js SSR pages. Use stale-while-revalidate to boost the performance.

"use strict";
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); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Metrics = exports.forMetrics = exports.serveMetrics = void 0;
function serveMetrics(m, res) {
    return __awaiter(this, void 0, void 0, function* () {
        res.setHeader('content-type', 'text/plain; version=0.0.4');
        Object.keys(m.data).forEach(k => {
            res.write(`next_boost_requests_total{status='${k}'} ${m.data[k]}\n`);
        });
        res.end();
    });
}
exports.serveMetrics = serveMetrics;
function forMetrics(req) {
    return req.url === '/__nextboost_metrics';
}
exports.forMetrics = forMetrics;
class Metrics {
    constructor() {
        this.data = {};
    }
    inc(key) {
        return (this.data[key] = (this.data[key] || 0) + 1);
    }
}
exports.Metrics = Metrics;