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| 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 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 | 6x 6x 6x 6x 6x 5x 2x 2x 3x 3x 3x 9x 9x 6x 6x 6x 6x 6x 6x 6x 3x 3x 3x 4x 3x 3x 3x 1x 1x | /**
* @file Safe localStorage wrapper with quota-aware eviction.
*
* Wraps `localStorage.setItem` so that `QuotaExceededError` (and the legacy
* Firefox `NS_ERROR_DOM_QUOTA_REACHED`) does not leak as an unhandled
* exception or noisy console error. On quota errors the helper evicts the
* oldest entries that share the caller's key prefix and retries once. If the
* payload still does not fit (e.g. a single oversized blob), the write is
* silently skipped — the caller will simply re-fetch on the next page load.
*
* @intelligence Resilient browser-cache layer — keeps dashboards functional
* when committee/election CSV blobs exceed the ~5 MB localStorage quota.
*/
import { logger } from './logger.js';
/**
* Detect whether an error represents a quota-exceeded condition.
* Covers DOMException name 'QuotaExceededError', legacy code 22, and the
* historical Firefox name 'NS_ERROR_DOM_QUOTA_REACHED' (code 1014).
*/
function isQuotaError(e: unknown): boolean {
Iif (!(e instanceof DOMException)) return false;
return (
e.name === 'QuotaExceededError' ||
e.name === 'NS_ERROR_DOM_QUOTA_REACHED' ||
e.code === 22 ||
e.code === 1014
);
}
/**
* Attempt `localStorage.setItem`. On quota exceeded, evict half of the
* entries sharing `evictionPrefix` (oldest-timestamp first when payloads are
* JSON `{ timestamp }` objects) and retry once. Other errors are logged and
* swallowed.
*
* @param key Full storage key to write.
* @param payload Serialized payload to store.
* @param evictionPrefix Prefix identifying related entries that may be
* evicted to make room. Typically the caller's namespace, e.g.
* `'committees-cache:'`.
* @returns `true` if the write succeeded, `false` otherwise.
*/
export function safeSetItem(
key: string,
payload: string,
evictionPrefix: string,
): boolean {
try {
localStorage.setItem(key, payload);
return true;
} catch (e: unknown) {
if (!isQuotaError(e)) {
logger.warn('safeSetItem: non-quota storage error', e);
return false;
}
}
const candidates: { key: string; timestamp: number }[] = [];
try {
for (let i = 0; i < localStorage.length; i++) {
const k = localStorage.key(i);
if (!k || !k.startsWith(evictionPrefix) || k === key) continue;
let ts = 0;
try {
const raw = localStorage.getItem(k);
Eif (raw) {
const parsed = JSON.parse(raw) as { timestamp?: unknown };
Eif (typeof parsed.timestamp === 'number') ts = parsed.timestamp;
}
} catch {
// Non-JSON entry under this prefix — treat as oldest so it gets purged first.
}
candidates.push({ key: k, timestamp: ts });
}
} catch {
return false;
}
candidates.sort((a, b) => a.timestamp - b.timestamp);
const removeCount = Math.max(1, Math.ceil(candidates.length / 2));
for (const entry of candidates.slice(0, removeCount)) {
try { localStorage.removeItem(entry.key); } catch { /* ignore */ }
}
try {
localStorage.setItem(key, payload);
return true;
} catch (retryErr) {
Eif (isQuotaError(retryErr)) {
return false;
}
logger.warn('safeSetItem: retry failed', retryErr);
return false;
}
}
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