@allan1361/iota-big3-sdk-middleware/dist/timeout-middleware.js

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.TimeoutMiddleware = void 0;
exports.createTimeoutMiddleware = createTimeoutMiddleware;
const events_1 = require("events");
class TimeoutMiddleware extends events_1.EventEmitter {
    constructor(config = {}) {
        super();
        this.stats = {
            totalRequests: 0,
            timedOutRequests: 0,
            averageResponseTime: 0
        };
        this.config = {
            timeout: config.timeout || 30000,
            message: config.message || 'Request timeout',
            skipPaths: config.skipPaths || [],
            onTimeout: config.onTimeout,
            dynamicTimeout: config.dynamicTimeout
        };
    }
    middleware(overrideTimeout) {
        return (req, res, next) => {
            if (this.config.skipPaths.includes(req.path)) {
                return next();
            }
            this.stats.totalRequests++;
            const startTime = Date.now();
            let timeout = overrideTimeout || this.config.timeout;
            if (this.config.dynamicTimeout) {
                timeout = this.config.dynamicTimeout(req);
            }
            let timedOut = false;
            const timer = setTimeout(() => {
                timedOut = true;
                this.stats.timedOutRequests++;
                this.emit('timeout', {
                    path: req.path,
                    method: req.method,
                    timeout,
                    duration: Date.now() - startTime
                });
                if (this.config.onTimeout) {
                    this.config.onTimeout(req, res);
                }
                else {
                    res.status(504).json({
                        error: this.config.message,
                        timeout,
                        path: req.path
                    });
                }
            }, timeout);
            const originalSend = res.send;
            const originalJson = res.json;
            const originalEnd = res.end;
            const clearTimer = () => {
                if (!timedOut) {
                    clearTimeout(timer);
                    const duration = Date.now() - startTime;
                    this.updateAverageResponseTime(duration);
                    this.emit('complete', {
                        path: req.path,
                        method: req.method,
                        duration
                    });
                }
            };
            res.send = function (body) {
                clearTimer();
                return originalSend.call(this, body);
            };
            res.json = function (body) {
                clearTimer();
                return originalJson.call(this, body);
            };
            res.end = function (chunk, encoding) {
                clearTimer();
                return originalEnd.call(this, chunk, encoding);
            };
            next();
        };
    }
    updateAverageResponseTime(duration) {
        const total = this.stats.totalRequests;
        const current = this.stats.averageResponseTime;
        this.stats.averageResponseTime = (current * (total - 1) + duration) / total;
    }
    getStats() {
        return {
            ...this.stats,
            timeoutRate: this.stats.totalRequests > 0
                ? (this.stats.timedOutRequests / this.stats.totalRequests) * 100
                : 0
        };
    }
    resetStats() {
        this.stats = {
            totalRequests: 0,
            timedOutRequests: 0,
            averageResponseTime: 0
        };
    }
}
exports.TimeoutMiddleware = TimeoutMiddleware;
function createTimeoutMiddleware(config) {
    return new TimeoutMiddleware(config);
}
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