File size: 2,097 Bytes
dbb1bf9 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | const RETRY_AFTER_MIN_SEC = 1;
const RETRY_AFTER_MAX_SEC = 60;
const RETRY_AFTER_DEFAULT_SEC = 5;
export function isTemporaryCloudPrefsStatus(status: number): boolean {
return status === 429 || status === 503;
}
/**
* Parse the `Retry-After` header per RFC 7231: either delta-seconds or an
* HTTP-date. Returns a clamped number of seconds, with the configured
* default for missing/malformed values.
*/
export function parseRetryAfterSeconds(headers: Headers): number {
const raw = headers.get('Retry-After');
if (!raw) return RETRY_AFTER_DEFAULT_SEC;
const trimmed = raw.trim();
if (/^\d+$/.test(trimmed)) {
const n = Number(trimmed);
if (!Number.isFinite(n)) return RETRY_AFTER_DEFAULT_SEC;
return Math.min(Math.max(n, RETRY_AFTER_MIN_SEC), RETRY_AFTER_MAX_SEC);
}
if (!/\b\d{4}\b/.test(trimmed) || !trimmed.includes(':')) return RETRY_AFTER_DEFAULT_SEC;
const t = Date.parse(trimmed);
if (!Number.isFinite(t)) return RETRY_AFTER_DEFAULT_SEC;
const delta = Math.round((t - Date.now()) / 1000);
return Math.min(Math.max(delta, RETRY_AFTER_MIN_SEC), RETRY_AFTER_MAX_SEC);
}
export interface TemporaryCloudPrefsRetryOptions {
status: number;
headers: Headers;
myGeneration: number;
getAuthGeneration: () => number;
setPending: () => void;
clearRetryTimer: () => void;
setRetryTimer: (timer: ReturnType<typeof setTimeout> | null) => void;
uploadNow: () => void | Promise<void>;
setTimeoutFn?: typeof setTimeout;
}
export function rearmTemporaryCloudPrefsRetry(opts: TemporaryCloudPrefsRetryOptions): boolean {
if (!isTemporaryCloudPrefsStatus(opts.status)) return false;
const retryAfterSec = parseRetryAfterSeconds(opts.headers);
if (opts.getAuthGeneration() !== opts.myGeneration) return true;
opts.setPending();
opts.clearRetryTimer();
const setTimeoutFn = opts.setTimeoutFn ?? setTimeout;
const timer = setTimeoutFn(() => {
opts.setRetryTimer(null);
if (opts.getAuthGeneration() !== opts.myGeneration) return;
void opts.uploadNow();
}, retryAfterSec * 1000);
opts.setRetryTimer(timer);
return true;
}
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