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closers.ts
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closers.ts
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import "./polyfill_node";
import type { Promisable } from "type-fest";
import type { Semaphore } from "wait-your-turn";
export interface Closer {
close: () => void;
}
export namespace Closer {
/** Close or dispose an object. */
export function close(c: any): Promisable<void> {
for (const key of ["close", Symbol.dispose, Symbol.asyncDispose] as const) {
if (typeof c[key] === "function") {
return c[key]();
}
}
}
/** Convert a closable object to AsyncDisposable. */
export function asAsyncDisposable(c: Closer | Disposable | AsyncDisposable): AsyncDisposable {
if (typeof (c as any)[Symbol.asyncDispose] === "function") {
return c as AsyncDisposable;
}
return {
async [Symbol.asyncDispose]() {
await close(c);
},
};
}
}
/** A list of objects that can be closed or disposed. */
export class Closers extends Array<Closer | Disposable | AsyncDisposable> implements Disposable {
/**
* Close all objects and clear the list.
*
* @remarks
* All objects added to this array are closed, in the reversed order as they appear in the array.
* This is a synchronous function, so that any AsyncDisposable objects in the array would have its
* asyncDispose method is called but not awaited.
* This array is cleared and can be reused.
*/
public readonly close = () => {
for (let i = this.length - 1; i >= 0; --i) {
void Closer.close(this[i]);
}
this.splice(0, Infinity);
};
public [Symbol.dispose](): void {
this.close();
}
/** Schedule a timeout or interval to be canceled upon close. */
public addTimeout<T extends NodeJS.Timeout | number>(t: T): T {
this.push({ close: () => clearTimeout(t) });
return t;
}
/** Wait for close. */
public wait(): Promise<void> {
return new Promise<void>((resolve) => {
this.push({ close: () => resolve() });
});
}
}
/**
* Acquire a semaphore for unlocking via Disposable.
* @param semaphore - Semaphore or Mutex from `wait-your-turn` package.
*/
export async function lock(semaphore: Pick<Semaphore, "acquire">): Promise<Disposable> {
const release = await semaphore.acquire();
return {
[Symbol.dispose](): void {
release();
},
};
}