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Viewing file:     DefaultRateLimiter.js (4.57 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.DefaultRateLimiter = void 0;
const service_error_classification_1 = require("@aws-sdk/service-error-classification");
class DefaultRateLimiter {
    constructor(options) {
        var _a, _b, _c, _d, _e;
        this.currentCapacity = 0;
        this.enabled = false;
        this.lastMaxRate = 0;
        this.measuredTxRate = 0;
        this.requestCount = 0;
        this.lastTimestamp = 0;
        this.timeWindow = 0;
        this.beta = (_a = options === null || options === void 0 ? void 0 : options.beta) !== null && _a !== void 0 ? _a : 0.7;
        this.minCapacity = (_b = options === null || options === void 0 ? void 0 : options.minCapacity) !== null && _b !== void 0 ? _b : 1;
        this.minFillRate = (_c = options === null || options === void 0 ? void 0 : options.minFillRate) !== null && _c !== void 0 ? _c : 0.5;
        this.scaleConstant = (_d = options === null || options === void 0 ? void 0 : options.scaleConstant) !== null && _d !== void 0 ? _d : 0.4;
        this.smooth = (_e = options === null || options === void 0 ? void 0 : options.smooth) !== null && _e !== void 0 ? _e : 0.8;
        const currentTimeInSeconds = this.getCurrentTimeInSeconds();
        this.lastThrottleTime = currentTimeInSeconds;
        this.lastTxRateBucket = Math.floor(this.getCurrentTimeInSeconds());
        this.fillRate = this.minFillRate;
        this.maxCapacity = this.minCapacity;
    }
    getCurrentTimeInSeconds() {
        return Date.now() / 1000;
    }
    async getSendToken() {
        return this.acquireTokenBucket(1);
    }
    async acquireTokenBucket(amount) {
        if (!this.enabled) {
            return;
        }
        this.refillTokenBucket();
        if (amount > this.currentCapacity) {
            const delay = ((amount - this.currentCapacity) / this.fillRate) * 1000;
            await new Promise((resolve) => setTimeout(resolve, delay));
        }
        this.currentCapacity = this.currentCapacity - amount;
    }
    refillTokenBucket() {
        const timestamp = this.getCurrentTimeInSeconds();
        if (!this.lastTimestamp) {
            this.lastTimestamp = timestamp;
            return;
        }
        const fillAmount = (timestamp - this.lastTimestamp) * this.fillRate;
        this.currentCapacity = Math.min(this.maxCapacity, this.currentCapacity + fillAmount);
        this.lastTimestamp = timestamp;
    }
    updateClientSendingRate(response) {
        let calculatedRate;
        this.updateMeasuredRate();
        if ((0, service_error_classification_1.isThrottlingError)(response)) {
            const rateToUse = !this.enabled ? this.measuredTxRate : Math.min(this.measuredTxRate, this.fillRate);
            this.lastMaxRate = rateToUse;
            this.calculateTimeWindow();
            this.lastThrottleTime = this.getCurrentTimeInSeconds();
            calculatedRate = this.cubicThrottle(rateToUse);
            this.enableTokenBucket();
        }
        else {
            this.calculateTimeWindow();
            calculatedRate = this.cubicSuccess(this.getCurrentTimeInSeconds());
        }
        const newRate = Math.min(calculatedRate, 2 * this.measuredTxRate);
        this.updateTokenBucketRate(newRate);
    }
    calculateTimeWindow() {
        this.timeWindow = this.getPrecise(Math.pow((this.lastMaxRate * (1 - this.beta)) / this.scaleConstant, 1 / 3));
    }
    cubicThrottle(rateToUse) {
        return this.getPrecise(rateToUse * this.beta);
    }
    cubicSuccess(timestamp) {
        return this.getPrecise(this.scaleConstant * Math.pow(timestamp - this.lastThrottleTime - this.timeWindow, 3) + this.lastMaxRate);
    }
    enableTokenBucket() {
        this.enabled = true;
    }
    updateTokenBucketRate(newRate) {
        this.refillTokenBucket();
        this.fillRate = Math.max(newRate, this.minFillRate);
        this.maxCapacity = Math.max(newRate, this.minCapacity);
        this.currentCapacity = Math.min(this.currentCapacity, this.maxCapacity);
    }
    updateMeasuredRate() {
        const t = this.getCurrentTimeInSeconds();
        const timeBucket = Math.floor(t * 2) / 2;
        this.requestCount++;
        if (timeBucket > this.lastTxRateBucket) {
            const currentRate = this.requestCount / (timeBucket - this.lastTxRateBucket);
            this.measuredTxRate = this.getPrecise(currentRate * this.smooth + this.measuredTxRate * (1 - this.smooth));
            this.requestCount = 0;
            this.lastTxRateBucket = timeBucket;
        }
    }
    getPrecise(num) {
        return parseFloat(num.toFixed(8));
    }
}
exports.DefaultRateLimiter = DefaultRateLimiter;