@terminus/ngx-tools
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44 lines • 7.89 kB
JavaScript
import { coerceDateProperty, coerceNumberProperty, } from '@terminus/ngx-tools/coercion';
import { range, throwError, timer, zip, } from 'rxjs';
import { async } from 'rxjs/internal/scheduler/async';
import { mergeMap, retryWhen, take, } from 'rxjs/operators';
import { exponentialBackoffDelayCalculator } from '../retry-with-backoff/delay-calculator';
const DEFAULT_RETRY_COUNT = 2;
const ERROR_CODE_TOO_MANY_REQUESTS = 429;
const ERROR_CODE_500_MIN = 500;
const ERROR_CODE_500_MAX = 599;
export const httpRetryer = ({ retries = DEFAULT_RETRY_COUNT, delayCalculator = exponentialBackoffDelayCalculator({}), scheduler = async, }) => retryWhen((errors) => zip(errors, range(1, retries + 1)).pipe(mergeMap(([err, retry]) => {
if (retry > retries || !isConsideredError(err)) {
return throwError(err);
}
let waitTime = delayCalculator(retry);
if (err.status === ERROR_CODE_TOO_MANY_REQUESTS) {
const headerWaitTime = extractRetryAfterTime(err);
waitTime = headerWaitTime || waitTime;
}
return timer(waitTime, scheduler).pipe(take(1));
})));
/**
* @param err
*/
function extractRetryAfterTime(err) {
const retryHeaderValue = err.headers.get('Retry-After');
if (retryHeaderValue) {
return coerceNumberProperty(retryHeaderValue, null)
|| coerceDateProperty(retryHeaderValue, null);
}
return null;
}
/**
* @param err
*/
function isConsideredError(err) {
if (err.hasOwnProperty('status') && err.hasOwnProperty('headers')) {
const e = err;
return e.status === 0
|| e.status === ERROR_CODE_TOO_MANY_REQUESTS
|| (e.status >= ERROR_CODE_500_MIN && e.status <= ERROR_CODE_500_MAX);
}
return false;
}
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