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Viewing file:     index.js (10.52 KB)      -rw-r--r--

'use strict';

var serviceErrorClassification = require('@smithy/service-error-classification');

exports.RETRY_MODES = void 0;
(function (RETRY_MODES) {
    RETRY_MODES["STANDARD"] = "standard";
    RETRY_MODES["ADAPTIVE"] = "adaptive";
})(exports.RETRY_MODES || (exports.RETRY_MODES = {}));
const DEFAULT_MAX_ATTEMPTS = 3;
const DEFAULT_RETRY_MODE = exports.RETRY_MODES.STANDARD;

class DefaultRateLimiter {
    static setTimeoutFn = setTimeout;
    beta;
    minCapacity;
    minFillRate;
    scaleConstant;
    smooth;
    currentCapacity = 0;
    enabled = false;
    lastMaxRate = 0;
    measuredTxRate = 0;
    requestCount = 0;
    fillRate;
    lastThrottleTime;
    lastTimestamp = 0;
    lastTxRateBucket;
    maxCapacity;
    timeWindow = 0;
    constructor(options) {
        this.beta = options?.beta ?? 0.7;
        this.minCapacity = options?.minCapacity ?? 1;
        this.minFillRate = options?.minFillRate ?? 0.5;
        this.scaleConstant = options?.scaleConstant ?? 0.4;
        this.smooth = options?.smooth ?? 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) => DefaultRateLimiter.setTimeoutFn(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 (serviceErrorClassification.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));
    }
}

const DEFAULT_RETRY_DELAY_BASE = 100;
const MAXIMUM_RETRY_DELAY = 20 * 1000;
const THROTTLING_RETRY_DELAY_BASE = 500;
const INITIAL_RETRY_TOKENS = 500;
const RETRY_COST = 5;
const TIMEOUT_RETRY_COST = 10;
const NO_RETRY_INCREMENT = 1;
const INVOCATION_ID_HEADER = "amz-sdk-invocation-id";
const REQUEST_HEADER = "amz-sdk-request";

const getDefaultRetryBackoffStrategy = () => {
    let delayBase = DEFAULT_RETRY_DELAY_BASE;
    const computeNextBackoffDelay = (attempts) => {
        return Math.floor(Math.min(MAXIMUM_RETRY_DELAY, Math.random() * 2 ** attempts * delayBase));
    };
    const setDelayBase = (delay) => {
        delayBase = delay;
    };
    return {
        computeNextBackoffDelay,
        setDelayBase,
    };
};

const createDefaultRetryToken = ({ retryDelay, retryCount, retryCost, }) => {
    const getRetryCount = () => retryCount;
    const getRetryDelay = () => Math.min(MAXIMUM_RETRY_DELAY, retryDelay);
    const getRetryCost = () => retryCost;
    return {
        getRetryCount,
        getRetryDelay,
        getRetryCost,
    };
};

class StandardRetryStrategy {
    maxAttempts;
    mode = exports.RETRY_MODES.STANDARD;
    capacity = INITIAL_RETRY_TOKENS;
    retryBackoffStrategy = getDefaultRetryBackoffStrategy();
    maxAttemptsProvider;
    constructor(maxAttempts) {
        this.maxAttempts = maxAttempts;
        this.maxAttemptsProvider = typeof maxAttempts === "function" ? maxAttempts : async () => maxAttempts;
    }
    async acquireInitialRetryToken(retryTokenScope) {
        return createDefaultRetryToken({
            retryDelay: DEFAULT_RETRY_DELAY_BASE,
            retryCount: 0,
        });
    }
    async refreshRetryTokenForRetry(token, errorInfo) {
        const maxAttempts = await this.getMaxAttempts();
        if (this.shouldRetry(token, errorInfo, maxAttempts)) {
            const errorType = errorInfo.errorType;
            this.retryBackoffStrategy.setDelayBase(errorType === "THROTTLING" ? THROTTLING_RETRY_DELAY_BASE : DEFAULT_RETRY_DELAY_BASE);
            const delayFromErrorType = this.retryBackoffStrategy.computeNextBackoffDelay(token.getRetryCount());
            const retryDelay = errorInfo.retryAfterHint
                ? Math.max(errorInfo.retryAfterHint.getTime() - Date.now() || 0, delayFromErrorType)
                : delayFromErrorType;
            const capacityCost = this.getCapacityCost(errorType);
            this.capacity -= capacityCost;
            return createDefaultRetryToken({
                retryDelay,
                retryCount: token.getRetryCount() + 1,
                retryCost: capacityCost,
            });
        }
        throw new Error("No retry token available");
    }
    recordSuccess(token) {
        this.capacity = Math.max(INITIAL_RETRY_TOKENS, this.capacity + (token.getRetryCost() ?? NO_RETRY_INCREMENT));
    }
    getCapacity() {
        return this.capacity;
    }
    async getMaxAttempts() {
        try {
            return await this.maxAttemptsProvider();
        }
        catch (error) {
            console.warn(`Max attempts provider could not resolve. Using default of ${DEFAULT_MAX_ATTEMPTS}`);
            return DEFAULT_MAX_ATTEMPTS;
        }
    }
    shouldRetry(tokenToRenew, errorInfo, maxAttempts) {
        const attempts = tokenToRenew.getRetryCount() + 1;
        return (attempts < maxAttempts &&
            this.capacity >= this.getCapacityCost(errorInfo.errorType) &&
            this.isRetryableError(errorInfo.errorType));
    }
    getCapacityCost(errorType) {
        return errorType === "TRANSIENT" ? TIMEOUT_RETRY_COST : RETRY_COST;
    }
    isRetryableError(errorType) {
        return errorType === "THROTTLING" || errorType === "TRANSIENT";
    }
}

class AdaptiveRetryStrategy {
    maxAttemptsProvider;
    rateLimiter;
    standardRetryStrategy;
    mode = exports.RETRY_MODES.ADAPTIVE;
    constructor(maxAttemptsProvider, options) {
        this.maxAttemptsProvider = maxAttemptsProvider;
        const { rateLimiter } = options ?? {};
        this.rateLimiter = rateLimiter ?? new DefaultRateLimiter();
        this.standardRetryStrategy = new StandardRetryStrategy(maxAttemptsProvider);
    }
    async acquireInitialRetryToken(retryTokenScope) {
        await this.rateLimiter.getSendToken();
        return this.standardRetryStrategy.acquireInitialRetryToken(retryTokenScope);
    }
    async refreshRetryTokenForRetry(tokenToRenew, errorInfo) {
        this.rateLimiter.updateClientSendingRate(errorInfo);
        return this.standardRetryStrategy.refreshRetryTokenForRetry(tokenToRenew, errorInfo);
    }
    recordSuccess(token) {
        this.rateLimiter.updateClientSendingRate({});
        this.standardRetryStrategy.recordSuccess(token);
    }
}

class ConfiguredRetryStrategy extends StandardRetryStrategy {
    computeNextBackoffDelay;
    constructor(maxAttempts, computeNextBackoffDelay = DEFAULT_RETRY_DELAY_BASE) {
        super(typeof maxAttempts === "function" ? maxAttempts : async () => maxAttempts);
        if (typeof computeNextBackoffDelay === "number") {
            this.computeNextBackoffDelay = () => computeNextBackoffDelay;
        }
        else {
            this.computeNextBackoffDelay = computeNextBackoffDelay;
        }
    }
    async refreshRetryTokenForRetry(tokenToRenew, errorInfo) {
        const token = await super.refreshRetryTokenForRetry(tokenToRenew, errorInfo);
        token.getRetryDelay = () => this.computeNextBackoffDelay(token.getRetryCount());
        return token;
    }
}

exports.AdaptiveRetryStrategy = AdaptiveRetryStrategy;
exports.ConfiguredRetryStrategy = ConfiguredRetryStrategy;
exports.DEFAULT_MAX_ATTEMPTS = DEFAULT_MAX_ATTEMPTS;
exports.DEFAULT_RETRY_DELAY_BASE = DEFAULT_RETRY_DELAY_BASE;
exports.DEFAULT_RETRY_MODE = DEFAULT_RETRY_MODE;
exports.DefaultRateLimiter = DefaultRateLimiter;
exports.INITIAL_RETRY_TOKENS = INITIAL_RETRY_TOKENS;
exports.INVOCATION_ID_HEADER = INVOCATION_ID_HEADER;
exports.MAXIMUM_RETRY_DELAY = MAXIMUM_RETRY_DELAY;
exports.NO_RETRY_INCREMENT = NO_RETRY_INCREMENT;
exports.REQUEST_HEADER = REQUEST_HEADER;
exports.RETRY_COST = RETRY_COST;
exports.StandardRetryStrategy = StandardRetryStrategy;
exports.THROTTLING_RETRY_DELAY_BASE = THROTTLING_RETRY_DELAY_BASE;
exports.TIMEOUT_RETRY_COST = TIMEOUT_RETRY_COST;