@daiso-tech/core/dist/backoff-policies/exponential-backoff/exponential-backoff.js

The library offers flexible, framework-agnostic solutions for modern web applications, built on adaptable components that integrate seamlessly with popular frameworks like Next Js.

/**
 * @module BackoffPolicy
 */
import {} from "../../backoff-policies/_shared.js";
import { TO_MILLISECONDS, } from "../../time-span/contracts/_module.js";
import { TimeSpan } from "../../time-span/implementations/_module.js";
import { callInvokable, isInvokable, withJitter } from "../../utilities/_module.js";
/**
 * @internal
 */
export function resolveExponentialBackoffSettings(settings) {
    const { maxDelay = TimeSpan.fromMilliseconds(60_000), minDelay = TimeSpan.fromMilliseconds(1_000), multiplier = 2, jitter = 0.5, _mathRandom = Math.random, } = settings;
    return {
        maxDelay,
        minDelay,
        multiplier,
        jitter,
        _mathRandom,
    };
}
/**
 * Exponential backoff policy with jitter
 *
 * IMPORT_PATH: `"@daiso-tech/core/backoff-policies"`
 */
export function exponentialBackoff(settings = {}) {
    return (attempt, error) => {
        if (isInvokable(settings)) {
            const dynamicSettings = callInvokable(settings, error);
            if (dynamicSettings === undefined) {
                settings = {};
            }
            else {
                settings = dynamicSettings;
            }
        }
        const { jitter, _mathRandom, multiplier, maxDelay, minDelay } = resolveExponentialBackoffSettings(settings);
        const exponential = Math.min(maxDelay[TO_MILLISECONDS](), minDelay[TO_MILLISECONDS]() * Math.pow(multiplier, attempt));
        return TimeSpan.fromMilliseconds(withJitter({
            jitter,
            value: exponential,
            randomValue: _mathRandom(),
        }));
    };
}
/**
 * @internal
 */
export function serializeExponentialBackoffSettings(settings) {
    const { maxDelay, minDelay, multiplier, jitter, _mathRandom } = resolveExponentialBackoffSettings(settings);
    return {
        maxDelay: maxDelay[TO_MILLISECONDS](),
        minDelay: minDelay[TO_MILLISECONDS](),
        multiplier,
        jitter,
        _mathRandom: _mathRandom(),
    };
}
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