799fb091b8
Implement following redirects over `fetch` supporting cookies.
`node-fetch` does not support sending cookies during redirect. However,
this is needed to not end-up in a redirect loop for a sign-in callback.
Fix integration tests failing due to redirects and 403 errors:
- Many redirects from `answers.microsoft.com` was throwing: throwing
`FetchError: maximum redirect reached` error. It was caused by not
having cookies when following redirects therefore having an infinite
sign-in callback for the webpage.
- Fixes integration tests failing due to additional referer header being
sent by the application. It adds support for making exceptions to
additional header sending through a list of regexes.
Add in-depth documentation for URL status checking.
45 lines
1.8 KiB
TypeScript
45 lines
1.8 KiB
TypeScript
import { sleepAsync } from '@/infrastructure/Threading/AsyncSleep';
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import { IUrlStatus } from './IUrlStatus';
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const DefaultBaseRetryIntervalInMs = 5 /* sec */ * 1000;
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export async function retryWithExponentialBackOffAsync(
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action: () => Promise<IUrlStatus>,
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baseRetryIntervalInMs: number = DefaultBaseRetryIntervalInMs,
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currentRetry = 1): Promise<IUrlStatus> {
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const maxTries: number = 3;
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const status = await action();
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if (shouldRetry(status)) {
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if (currentRetry <= maxTries) {
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const exponentialBackOffInMs = getRetryTimeoutInMs(currentRetry, baseRetryIntervalInMs);
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// tslint:disable-next-line: no-console
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console.log(`Retrying (${currentRetry}) in ${exponentialBackOffInMs / 1000} seconds`, status);
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await sleepAsync(exponentialBackOffInMs);
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return retryWithExponentialBackOffAsync(action, baseRetryIntervalInMs, currentRetry + 1);
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}
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}
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return status;
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}
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function shouldRetry(status: IUrlStatus) {
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if (status.error) {
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return true;
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}
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return isTransientError(status.code)
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|| status.code === 429; // Too Many Requests
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}
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function isTransientError(statusCode: number) {
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return statusCode >= 500 && statusCode <= 599;
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}
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function getRetryTimeoutInMs(currentRetry: number, baseRetryIntervalInMs: number = DefaultBaseRetryIntervalInMs) {
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const retryRandomFactor = 0.5; // Retry intervals are between 50% and 150%
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// of the exponentially increasing base amount
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const minRandom = 1 - retryRandomFactor;
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const maxRandom = 1 + retryRandomFactor;
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const randomization = (Math.random() * (maxRandom - minRandom)) + maxRandom;
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const exponential = Math.pow(2, currentRetry - 1);
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return Math.ceil(exponential * baseRetryIntervalInMs * randomization);
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}
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