node-async-context.ts•1.27 kB
/**
* Copyright 2025 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { AsyncLocalStorage } from 'node:async_hooks';
import { AsyncContext, setAsyncContext } from './async-context.js';
/**
* Manages AsyncLocalStorage instances in a single place.
*/
export class NodeAsyncContext implements AsyncContext {
private asls: Record<string, AsyncLocalStorage<any>> = {};
getStore<T>(key: string): T | undefined {
return this.asls[key]?.getStore();
}
run<T, R>(key: string, store: T, callback: () => R): R {
if (!this.asls[key]) {
this.asls[key] = new AsyncLocalStorage<T>();
}
return this.asls[key].run(store, callback);
}
}
export function initNodeAsyncContext() {
setAsyncContext(new NodeAsyncContext());
}