AsyncLocalStorageContextManager.ts

/*
 * Copyright The OpenTelemetry Authors
 *
 * 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
 *
 *      https://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 { Context } from '@opentelemetry/context-base';
import { AsyncLocalStorage } from 'async_hooks';
import { AbstractAsyncHooksContextManager } from './AbstractAsyncHooksContextManager';

export class AsyncLocalStorageContextManager extends AbstractAsyncHooksContextManager {
  private _asyncLocalStorage: AsyncLocalStorage<Context>;

  constructor() {
    super();
    this._asyncLocalStorage = new AsyncLocalStorage();
  }

  active(): Context {
    return this._asyncLocalStorage.getStore() ?? Context.ROOT_CONTEXT;
  }

  with<T extends (...args: unknown[]) => ReturnType<T>>(
    context: Context,
    fn: T
  ): ReturnType<T> {
    return this._asyncLocalStorage.run(context, fn) as ReturnType<T>;
  }

  enable(): this {
    return this;
  }

  disable(): this {
    this._asyncLocalStorage.disable();
    return this;
  }
}