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/**
* Error type representing the cancellation of an operation.
*/
export class CancellationError extends Error {
/**
* The name of the error.
*/
readonly name = 'CancellationError';
/**
* HTTP status code representing client-closed request.
*/
readonly statusCode: number = 499;
constructor() {
super('Operation canceled');
}
}
/**
* Wraps a promise with a cancellation token.
* @param promise The promise to wrap.
* @param token The cancellation token.
* @returns A promise that resolves or rejects based on the original promise, or rejects with a cancellation error if the token is triggered.
*/
export async function withCancellation<T>(
promise: Promise<T>,
token?: vscode.CancellationToken
): Promise<T> {
if (!token) {
return promise;
} else {
return new Promise<T>((resolve, reject) => {
if (token.isCancellationRequested) {
reject(new CancellationError());
} else {
const subscription = token.onCancellationRequested(() => {
subscription.dispose();
reject(new CancellationError());
});
promise.then(
v => { subscription.dispose(); resolve(v); },
e => { subscription.dispose(); reject(e); }
);
}
});
}
}
/**
* Collects any AsyncIterable into an array with VS Code cancellation.
* @remarks Uses a for-await loop; no dependency on .toArray().
*/
export async function toArrayWithCancellation<T>(
iterable: AsyncIterable<T>,
token?: vscode.CancellationToken
): Promise<T[]> {
if (!token) {
// Fast path: no token => plain for-await.
return _toArray(iterable);
} else {
// Cancellation-aware: race each next() against a cancel promise.
return _toArrayWithCancellation(iterable, token);
}
}
/**
* Collects all items from a generic async iterable into an array.
* @param iterable A generic async iterable.
* @returns An array of all items from the iterable.
*/
async function _toArray<T>(iterable: AsyncIterable<T>): Promise<T[]> {
const result: T[] = [];
try {
for await (const item of iterable) {
result.push(item);
}
} finally {
_tryClose(iterable);
}
return result;
}
/**
* Collects all items from a generic async iterable into an array.
* @param iterable A generic async iterable.
* @param token A cancellation token.
* @returns An array of all items from the iterable.
*/
async function _toArrayWithCancellation<T>(
iterable: AsyncIterable<T>,
token: vscode.CancellationToken
): Promise<T[]> {
if (token.isCancellationRequested) {
_tryClose(iterable);
throw new CancellationError();
}
let subscription: vscode.Disposable | undefined;
const cancel = new Promise<never>((_, reject) => {
subscription = token.onCancellationRequested(() => {
_tryClose(iterable);
reject(new CancellationError());
});
});
try {
const result: T[] = [];
const iterator = iterable[Symbol.asyncIterator]();
while (true) {
const next = iterator.next();
const race = await Promise.race([next, cancel]) as IteratorResult<T>;
if (race.done) break;
result.push(race.value);
}
return result;
} finally {
subscription?.dispose();
_tryClose(iterable);
}
}
function _tryClose(iterator: any) {
try { iterator.return?.(); } catch { }
try { iterator.close?.(); } catch { }
try { iterator.destroy?.(); } catch { }
} |