Yeet

src/state/persisted/session-lock.web.ts

@@ -0,0 +1,37 @@
+const PERSISTED_STORAGE_LOCK = 'bsky-persisted-storage'
+const SESSION_LOCK_PREFIX = 'bsky-session:'
+
+export function runWithSessionCredentialLock<T>({
+  accountDids,
+  operation,
+}: {
+  accountDids: string[]
+  operation: () => T | Promise<T>
+}): Promise<T> {
+  const lockManager = navigator.locks
+  if (!lockManager) {
+    try {
+      return Promise.resolve(operation())
+    } catch (error) {
+      return Promise.reject(
+        error instanceof Error
+          ? error
+          : new Error('Session credential operation failed', {cause: error}),
+      )
+    }
+  }
+
+  const accountLockNames = [...new Set(accountDids)]
+    .sort()
+    .map(did => `${SESSION_LOCK_PREFIX}${did}`)
+  /* All values share one localStorage blob, so every write also takes its lock. */
+  const lockNames = [PERSISTED_STORAGE_LOCK, ...accountLockNames]
+
+  const run = (index: number): Promise<T> => {
+    const lockName = lockNames[index]
+    if (!lockName) return Promise.resolve(operation())
+    return lockManager.request(lockName, () => run(index + 1))
+  }
+
+  return run(0)
+}