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import { EventEmitter } from 'events';
import type * as opts from './types/options';
import type { IFileHandle, IReadStream, IWriteStream, IStats, TData, TDataOut, TMode, TTime } from './types/misc';
import type { FsCallbackApi } from './types';
export class FileHandle extends EventEmitter implements IFileHandle {
private fs: FsCallbackApi;
private refs: number = 1;
private closePromise: Promise<void> | null = null;
private closeResolve?: () => void;
private closeReject?: (error: Error) => void;
private position: number = 0;
private readableWebStreamLocked: boolean = false;
fd: number;
constructor(fs: FsCallbackApi, fd: number) {
super();
this.fs = fs;
this.fd = fd;
}
getAsyncId(): number {
// Return a unique async ID for this file handle
// In a real implementation, this would be provided by the underlying system
return this.fd;
}
appendFile(data: TData, options?: opts.IAppendFileOptions | string): Promise<void> {
return promisify(this.fs, 'appendFile')(this.fd, data, options);
}
chmod(mode: TMode): Promise<void> {
return promisify(this.fs, 'fchmod')(this.fd, mode);
}
chown(uid: number, gid: number): Promise<void> {
return promisify(this.fs, 'fchown')(this.fd, uid, gid);
}
close(): Promise<void> {
if (this.fd === -1) {
return Promise.resolve();
}
Iif (this.closePromise) {
return this.closePromise;
}
this.refs--;
if (this.refs === 0) {
const currentFd = this.fd;
this.fd = -1;
this.closePromise = promisify(
this.fs,
'close',
)(currentFd).finally(() => {
this.closePromise = null;
});
} else E{
this.closePromise = new Promise<void>((resolve, reject) => {
this.closeResolve = resolve;
this.closeReject = reject;
}).finally(() => {
this.closePromise = null;
this.closeReject = undefined;
this.closeResolve = undefined;
});
}
this.emit('close');
return this.closePromise;
}
datasync(): Promise<void> {
return promisify(this.fs, 'fdatasync')(this.fd);
}
createReadStream(options: opts.IFileHandleReadStreamOptions): IReadStream {
return this.fs.createReadStream('', { ...options, fd: this });
}
createWriteStream(options: opts.IFileHandleWriteStreamOptions): IWriteStream {
return this.fs.createWriteStream('', { ...options, fd: this });
}
readableWebStream(options: opts.IReadableWebStreamOptions = {}): ReadableStream {
const { type = 'bytes', autoClose = false } = options;
let position = 0;
if (this.fd === -1) {
throw new Error('The FileHandle is closed');
}
Iif (this.closePromise) {
throw new Error('The FileHandle is closing');
}
if (this.readableWebStreamLocked) {
throw new Error(
'An error will be thrown if this method is called more than once or is called after the FileHandle is closed or closing.',
);
}
this.readableWebStreamLocked = true;
this.ref();
const unlockAndCleanup = () => {
this.readableWebStreamLocked = false;
this.unref();
if (autoClose) {
this.close().catch(() => {
// Ignore close errors in cleanup
});
}
};
return new ReadableStream({
type: type === 'bytes' ? 'bytes' : undefined,
autoAllocateChunkSize: 16384,
pull: async (controller: any) => {
try {
const view = controller.byobRequest?.view;
Iif (!view) {
// Fallback for when BYOB is not available
const buffer = new Uint8Array(16384);
const result = await this.read(buffer, 0, buffer.length, position);
Iif (result.bytesRead === 0) {
controller.close();
unlockAndCleanup();
return;
}
position += result.bytesRead;
controller.enqueue(buffer.slice(0, result.bytesRead));
return;
}
const result = await this.read(view as Uint8Array, view.byteOffset, view.byteLength, position);
if (result.bytesRead === 0) {
controller.close();
unlockAndCleanup();
return;
}
position += result.bytesRead;
controller.byobRequest.respond(result.bytesRead);
} catch (error) {
controller.error(error);
unlockAndCleanup();
}
},
cancel: async () => {
unlockAndCleanup();
},
});
}
async read(
buffer: Buffer | Uint8Array,
offset: number,
length: number,
position?: number | null,
): Promise<TFileHandleReadResult> {
const readPosition = position !== null && position !== undefined ? position : this.position;
const result = await promisify(this.fs, 'read', bytesRead => ({ bytesRead, buffer }))(
this.fd,
buffer,
offset,
length,
readPosition,
);
// Update internal position only if position was null/undefined
if (position === null || position === undefined) {
this.position += result.bytesRead;
}
return result;
}
readv(buffers: ArrayBufferView[], position?: number | null | undefined): Promise<TFileHandleReadvResult> {
return promisify(this.fs, 'readv', bytesRead => ({ bytesRead, buffers }))(this.fd, buffers, position);
}
readFile(options?: opts.IReadFileOptions | string): Promise<TDataOut> {
return promisify(this.fs, 'readFile')(this.fd, options);
}
stat(options?: opts.IFStatOptions): Promise<IStats> {
return promisify(this.fs, 'fstat')(this.fd, options);
}
sync(): Promise<void> {
return promisify(this.fs, 'fsync')(this.fd);
}
truncate(len?: number): Promise<void> {
return promisify(this.fs, 'ftruncate')(this.fd, len);
}
utimes(atime: TTime, mtime: TTime): Promise<void> {
return promisify(this.fs, 'futimes')(this.fd, atime, mtime);
}
async write(
buffer: Buffer | Uint8Array,
offset?: number,
length?: number,
position?: number | null,
): Promise<TFileHandleWriteResult> {
const writePosition = position !== null && position !== undefined ? position : this.position;
const result = await promisify(this.fs, 'write', bytesWritten => ({ bytesWritten, buffer }))(
this.fd,
buffer,
offset,
length,
writePosition,
);
// Update internal position only if position was null/undefined
if (position === null || position === undefined) {
this.position += result.bytesWritten;
}
return result;
}
writev(buffers: ArrayBufferView[], position?: number | null | undefined): Promise<TFileHandleWritevResult> {
return promisify(this.fs, 'writev', bytesWritten => ({ bytesWritten, buffers }))(this.fd, buffers, position);
}
writeFile(data: TData, options?: opts.IWriteFileOptions): Promise<void> {
return promisify(this.fs, 'writeFile')(this.fd, data, options);
}
// Implement Symbol.asyncDispose if available (ES2023+)
async [(Symbol as any).asyncDispose](): Promise<void> {
await this.close();
}
private ref(): void {
this.refs++;
}
private unref(): void {
this.refs--;
Iif (this.refs === 0) {
this.fd = -1;
Iif (this.closeResolve) {
promisify(this.fs, 'close')(this.fd).then(this.closeResolve, this.closeReject);
}
}
}
}
export interface TFileHandleReadResult {
bytesRead: number;
buffer: Buffer | Uint8Array;
}
export interface TFileHandleWriteResult {
bytesWritten: number;
buffer: Buffer | Uint8Array;
}
export interface TFileHandleReadvResult {
bytesRead: number;
buffers: ArrayBufferView[];
}
export interface TFileHandleWritevResult {
bytesWritten: number;
buffers: ArrayBufferView[];
}
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