同步异常兜底

server/utils/backup/cancel-state.ts

@@ -0,0 +1,64 @@
+interface JobCancellationState {
+  requested: Set<string>
+  controllers: Map<string, AbortController>
+}
+
+const CANCELLED_CODE = 'JOB_CANCELLED'
+
+const state = (globalThis as typeof globalThis & {
+  __pichostJobCancellationState?: JobCancellationState
+}).__pichostJobCancellationState ?? {
+  requested: new Set<string>(),
+  controllers: new Map<string, AbortController>()
+}
+;(globalThis as typeof globalThis & {
+  __pichostJobCancellationState?: JobCancellationState
+}).__pichostJobCancellationState = state
+
+export function createJobCancelledError(): Error {
+  const error = new Error('任务已取消')
+  error.name = CANCELLED_CODE
+  return error
+}
+
+export function isJobCancelledError(error: unknown): boolean {
+  return error instanceof Error && error.name === CANCELLED_CODE
+}
+
+export function beginJobCancellationScope(jobId: string): void {
+  state.requested.delete(jobId)
+  state.controllers.get(jobId)?.abort()
+  state.controllers.set(jobId, new AbortController())
+}
+
+export function endJobCancellationScope(jobId: string): void {
+  state.controllers.delete(jobId)
+  state.requested.delete(jobId)
+}
+
+export function requestJobCancellation(jobId: string): void {
+  state.requested.add(jobId)
+  state.controllers.get(jobId)?.abort(createJobCancelledError())
+}
+
+export function isJobCancellationRequested(jobId: string): boolean {
+  return state.requested.has(jobId)
+}
+
+export function getJobAbortSignal(jobId: string): AbortSignal {
+  return state.controllers.get(jobId)?.signal ?? new AbortController().signal
+}
+
+export function getJobOperationSignal(
+  jobId: string,
+  timeoutMs: number
+): AbortSignal {
+  return AbortSignal.any([
+    getJobAbortSignal(jobId),
+    AbortSignal.timeout(timeoutMs)
+  ])
+}
+
+export function throwIfJobCancellationRequested(jobId: string): void {
+  if (isJobCancellationRequested(jobId)) throw createJobCancelledError()
+}