function destroyer(stream, reading, writing, callback) {
callback = once(callback);
let closed = false;
stream.on('close', () => {
closed = true;
});
eos(stream, { readable: reading, writable: writing }, (err) => {
if (err) return callback(err);
closed = true;
callback();
});
let destroyed = false;
return (err) => {
if (closed) return;
if (destroyed) return;
destroyed = true;
// request.destroy just do .end - .abort is what we want
if (isRequest(stream)) return stream.abort();
if (typeof stream.destroy === 'function') return stream.destroy();
callback(err || new ERR_STREAM_DESTROYED('pipe'));
};
}
const createReadableStreamAsyncIterator = (stream) => {
const iterator = Object.create(ReadableStreamAsyncIteratorPrototype, {
[kStream]: { value: stream, writable: true },
[kLastResolve]: { value: null, writable: true },
[kLastReject]: { value: null, writable: true },
[kError]: { value: null, writable: true },
[kEnded]: {
value: stream._readableState.endEmitted,
writable: true
},
[kLastPromise]: { value: null, writable: true },
// the function passed to new Promise
// is cached so we avoid allocating a new
// closure at every run
[kHandlePromise]: {
value: (resolve, reject) => {
const data = iterator[kStream].read();
if (data) {
iterator[kLastPromise] = null;
iterator[kLastResolve] = null;
iterator[kLastReject] = null;
resolve(createIterResult(data, false));
} else {
iterator[kLastResolve] = resolve;
iterator[kLastReject] = reject;
}
},
writable: true,
},
});
finished(stream, (err) => {
if (err && err.code !== 'ERR_STREAM_PREMATURE_CLOSE') {
const reject = iterator[kLastReject];
// reject if we are waiting for data in the Promise
// returned by next() and store the error
if (reject !== null) {
iterator[kLastPromise] = null;
iterator[kLastResolve] = null;
iterator[kLastReject] = null;
reject(err);
}
iterator[kError] = err;
return;
}
const resolve = iterator[kLastResolve];
if (resolve !== null) {
iterator[kLastPromise] = null;
iterator[kLastResolve] = null;
iterator[kLastReject] = null;
resolve(createIterResult(null, true));
}
iterator[kEnded] = true;
});
stream.on('readable', onReadable.bind(null, iterator));
return iterator;
};