56 lines
1.7 KiB
TypeScript
56 lines
1.7 KiB
TypeScript
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/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import { AsyncLocalStorage } from 'async_hooks';
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export type ZoneType = 'apiZone' | 'stepZone';
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const asyncLocalStorage = new AsyncLocalStorage<Zone | undefined>();
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export class Zone {
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private readonly _asyncLocalStorage: AsyncLocalStorage<Zone | undefined>;
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private readonly _data: ReadonlyMap<ZoneType, unknown>;
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constructor(asyncLocalStorage: AsyncLocalStorage<Zone | undefined>, store: Map<ZoneType, unknown>) {
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this._asyncLocalStorage = asyncLocalStorage;
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this._data = store;
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}
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with(type: ZoneType, data: unknown): Zone {
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return new Zone(this._asyncLocalStorage, new Map(this._data).set(type, data));
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}
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without(type?: ZoneType): Zone {
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const data = type ? new Map(this._data) : new Map();
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data.delete(type);
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return new Zone(this._asyncLocalStorage, data);
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}
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run<R>(func: () => R): R {
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return this._asyncLocalStorage.run(this, func);
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}
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data<T>(type: ZoneType): T | undefined {
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return this._data.get(type) as T | undefined;
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}
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}
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export const emptyZone = new Zone(asyncLocalStorage, new Map());
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export function currentZone(): Zone {
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return asyncLocalStorage.getStore() ?? emptyZone;
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}
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