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75 lines
2.5 KiB
TypeScript
75 lines
2.5 KiB
TypeScript
/**
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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' | 'expectZone' | 'stepZone';
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class ZoneManager {
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private readonly _asyncLocalStorage = new AsyncLocalStorage<Zone|undefined>();
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run<T, R>(type: ZoneType, data: T, func: () => R): R {
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const zone = Zone._createWithData(this._asyncLocalStorage, type, data);
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return this._asyncLocalStorage.run(zone, func);
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}
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zoneData<T>(type: ZoneType): T | undefined {
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const zone = this._asyncLocalStorage.getStore();
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return zone?.get(type);
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}
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currentZone(): Zone {
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return this._asyncLocalStorage.getStore() ?? Zone._createEmpty(this._asyncLocalStorage);
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}
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exitZones<R>(func: () => R): R {
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return this._asyncLocalStorage.run(undefined, func);
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}
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}
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export class Zone {
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private readonly _asyncLocalStorage: AsyncLocalStorage<Zone | undefined>;
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private readonly _data: Map<ZoneType, unknown>;
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static _createWithData(asyncLocalStorage: AsyncLocalStorage<Zone|undefined>, type: ZoneType, data: unknown) {
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const store = new Map(asyncLocalStorage.getStore()?._data);
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store.set(type, data);
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return new Zone(asyncLocalStorage, store);
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}
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static _createEmpty(asyncLocalStorage: AsyncLocalStorage<Zone|undefined>) {
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return new Zone(asyncLocalStorage, new Map());
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}
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private 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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run<R>(func: () => R): R {
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// Reset apiZone and expectZone, but restore stepZone.
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const entries = [...this._data.entries()].filter(([type]) => (type !== 'apiZone' && type !== 'expectZone'));
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const resetZone = new Zone(this._asyncLocalStorage, new Map(entries));
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return this._asyncLocalStorage.run(resetZone, func);
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}
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get<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 zones = new ZoneManager();
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