Function lookupResolveCache

packages/dofs/src/fs/resolveCache.ts:59–72

(
  db: Database,
  canonicalPath: string,
)

// Look up a canonical path. Returns undefined on a miss, a positive
// inode hit, or a negative (known-absent) hit. Bumps LRU recency.
export function lookupResolveCache(
  db: Database,
  canonicalPath: string,
): ResolveCacheHit | undefined {
  const cache = cacheFor(db);
  const value = cache.get(canonicalPath);
  if (value === undefined) {
    return undefined;
  }
  // Move to most-recent position for LRU eviction.
  cache.delete(canonicalPath);
  cache.set(canonicalPath, value);
  return value === NEGATIVE ? { kind: "negative" } : { kind: "inode", inode: value };
}

// Cache a resolution. `inode === null` records a negative entry. No-op
// while a transaction is active so the cache never reflects