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const {
ArrayPrototypePush,
Error,
MathMax,
MathMin,
NumberIsSafeInteger,
Promise,
PromisePrototypeThen,
PromiseResolve,
PromiseReject,
SafeArrayIterator,
SafePromisePrototypeFinally,
Symbol,
Uint8Array,
} = primordials;
const { fs: constants } = internalBinding('constants');
const {
F_OK,
O_SYMLINK,
O_WRONLY,
S_IFMT,
S_IFREG
} = constants;
const binding = internalBinding('fs');
const { Buffer } = require('buffer');
const {
codes: {
ERR_FS_FILE_TOO_LARGE,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_STATE,
ERR_METHOD_NOT_IMPLEMENTED,
},
AbortError,
aggregateTwoErrors,
} = require('internal/errors');
const { isArrayBufferView } = require('internal/util/types');
const { rimrafPromises } = require('internal/fs/rimraf');
const {
constants: {
kIoMaxLength,
kMaxUserId,
kReadFileBufferLength,
kReadFileUnknownBufferLength,
kWriteFileMaxChunkSize,
},
copyObject,
emitRecursiveRmdirWarning,
getDirents,
getOptions,
getStatsFromBinding,
getValidatedPath,
getValidMode,
nullCheck,
preprocessSymlinkDestination,
stringToFlags,
stringToSymlinkType,
toUnixTimestamp,
validateBufferArray,
validateCpOptions,
validateOffsetLengthRead,
validateOffsetLengthWrite,
validateRmOptions,
validateRmdirOptions,
validatePrimitiveStringAfterArrayBufferView,
warnOnNonPortableTemplate,
} = require('internal/fs/utils');
const { opendir } = require('internal/fs/dir');
const {
parseFileMode,
validateAbortSignal,
validateBoolean,
validateBuffer,
validateEncoding,
validateInteger,
validateString,
} = require('internal/validators');
const pathModule = require('path');
const {
kEmptyObject,
lazyDOMException,
promisify,
} = require('internal/util');
const { EventEmitterMixin } = require('internal/event_target');
const { watch } = require('internal/fs/watchers');
const { isIterable } = require('internal/streams/utils');
const assert = require('internal/assert');
const kHandle = Symbol('kHandle');
const kFd = Symbol('kFd');
const kRefs = Symbol('kRefs');
const kClosePromise = Symbol('kClosePromise');
const kCloseResolve = Symbol('kCloseResolve');
const kCloseReject = Symbol('kCloseReject');
const kRef = Symbol('kRef');
const kUnref = Symbol('kUnref');
const kLocked = Symbol('kLocked');
const { kUsePromises } = binding;
const {
JSTransferable, kDeserialize, kTransfer, kTransferList
} = require('internal/worker/js_transferable');
const {
newReadableStreamFromStreamBase,
} = require('internal/webstreams/adapters');
const {
readableStreamCancel,
} = require('internal/webstreams/readablestream');
const getDirectoryEntriesPromise = promisify(getDirents);
const validateRmOptionsPromise = promisify(validateRmOptions);
let cpPromises;
function lazyLoadCpPromises() {
return cpPromises ??= require('internal/fs/cp/cp').cpFn;
}
// Lazy loaded to avoid circular dependency.
let fsStreams;
function lazyFsStreams() {
return fsStreams ??= require('internal/fs/streams');
}
class FileHandle extends EventEmitterMixin(JSTransferable) {
/**
* @param {InternalFSBinding.FileHandle | undefined} filehandle
*/
constructor(filehandle) {
super();
this[kHandle] = filehandle;
this[kFd] = filehandle ? filehandle.fd : -1;
this[kRefs] = 1;
this[kClosePromise] = null;
}
getAsyncId() {
return this[kHandle].getAsyncId();
}
get fd() {
return this[kFd];
}
appendFile(data, options) {
return fsCall(writeFile, this, data, options);
}
chmod(mode) {
return fsCall(fchmod, this, mode);
}
chown(uid, gid) {
return fsCall(fchown, this, uid, gid);
}
datasync() {
return fsCall(fdatasync, this);
}
sync() {
return fsCall(fsync, this);
}
read(buffer, offset, length, position) {
return fsCall(read, this, buffer, offset, length, position);
}
readv(buffers, position) {
return fsCall(readv, this, buffers, position);
}
readFile(options) {
return fsCall(readFile, this, options);
}
stat(options) {
return fsCall(fstat, this, options);
}
truncate(len = 0) {
return fsCall(ftruncate, this, len);
}
utimes(atime, mtime) {
return fsCall(futimes, this, atime, mtime);
}
write(buffer, offset, length, position) {
return fsCall(write, this, buffer, offset, length, position);
}
writev(buffers, position) {
return fsCall(writev, this, buffers, position);
}
writeFile(data, options) {
return fsCall(writeFile, this, data, options);
}
close = () => {
if (this[kFd] === -1) {
return PromiseResolve();
}
if (this[kClosePromise]) {
return this[kClosePromise];
}
this[kRefs]--;
if (this[kRefs] === 0) {
this[kFd] = -1;
this[kClosePromise] = SafePromisePrototypeFinally(
this[kHandle].close(),
() => { this[kClosePromise] = undefined; }
);
} else {
this[kClosePromise] = SafePromisePrototypeFinally(
new Promise((resolve, reject) => {
this[kCloseResolve] = resolve;
this[kCloseReject] = reject;
}), () => {
this[kClosePromise] = undefined;
this[kCloseReject] = undefined;
this[kCloseResolve] = undefined;
}
);
}
this.emit('close');
return this[kClosePromise];
};
/**
* @typedef {import('../webstreams/readablestream').ReadableStream
* } ReadableStream
* @returns {ReadableStream}
*/
readableWebStream() {
if (this[kFd] === -1)
throw new ERR_INVALID_STATE('The FileHandle is closed');
if (this[kClosePromise])
throw new ERR_INVALID_STATE('The FileHandle is closing');
if (this[kLocked])
throw new ERR_INVALID_STATE('The FileHandle is locked');
this[kLocked] = true;
const readable = newReadableStreamFromStreamBase(
this[kHandle],
undefined,
{ ondone: () => this[kUnref]() });
this[kRef]();
this.once('close', () => {
readableStreamCancel(readable);
});
return readable;
}
/**
* @typedef {import('./streams').ReadStream
* } ReadStream
* @param {{
* encoding?: string;
* autoClose?: boolean;
* emitClose?: boolean;
* start: number;
* end?: number;
* highWaterMark?: number;
* }} [options]
* @returns {ReadStream}
*/
createReadStream(options = undefined) {
const { ReadStream } = lazyFsStreams();
return new ReadStream(undefined, { ...options, fd: this });
}
/**
* @typedef {import('./streams').WriteStream
* } WriteStream
* @param {{
* encoding?: string;
* autoClose?: boolean;
* emitClose?: boolean;
* start: number;
* }} [options]
* @returns {WriteStream}
*/
createWriteStream(options = undefined) {
const { WriteStream } = lazyFsStreams();
return new WriteStream(undefined, { ...options, fd: this });
}
[kTransfer]() {
if (this[kClosePromise] || this[kRefs] > 1) {
throw lazyDOMException('Cannot transfer FileHandle while in use',
'DataCloneError');
}
const handle = this[kHandle];
this[kFd] = -1;
this[kHandle] = null;
this[kRefs] = 0;
return {
data: { handle },
deserializeInfo: 'internal/fs/promises:FileHandle'
};
}
[kTransferList]() {
return [ this[kHandle] ];
}
[kDeserialize]({ handle }) {
this[kHandle] = handle;
this[kFd] = handle.fd;
}
[kRef]() {
this[kRefs]++;
}
[kUnref]() {
this[kRefs]--;
if (this[kRefs] === 0) {
this[kFd] = -1;
PromisePrototypeThen(
this[kHandle].close(),
this[kCloseResolve],
this[kCloseReject]
);
}
}
}
async function handleFdClose(fileOpPromise, closeFunc) {
return PromisePrototypeThen(
fileOpPromise,
(result) => PromisePrototypeThen(closeFunc(), () => result),
(opError) =>
PromisePrototypeThen(
closeFunc(),
() => PromiseReject(opError),
(closeError) => PromiseReject(aggregateTwoErrors(closeError, opError))
)
);
}
async function fsCall(fn, handle, ...args) {
assert(handle[kRefs] !== undefined,
'handle must be an instance of FileHandle');
if (handle.fd === -1) {
// eslint-disable-next-line no-restricted-syntax
const err = new Error('file closed');
err.code = 'EBADF';
err.syscall = fn.name;
throw err;
}
try {
handle[kRef]();
return await fn(handle, ...new SafeArrayIterator(args));
} finally {
handle[kUnref]();
}
}
function checkAborted(signal) {
if (signal?.aborted)
throw new AbortError(undefined, { cause: signal?.reason });
}
async function writeFileHandle(filehandle, data, signal, encoding) {
checkAborted(signal);
if (isCustomIterable(data)) {
for await (const buf of data) {
checkAborted(signal);
const toWrite =
isArrayBufferView(buf) ? buf : Buffer.from(buf, encoding || 'utf8');
let remaining = toWrite.byteLength;
while (remaining > 0) {
const writeSize = MathMin(kWriteFileMaxChunkSize, remaining);
const { bytesWritten } = await write(
filehandle, toWrite, toWrite.byteLength - remaining, writeSize);
remaining -= bytesWritten;
checkAborted(signal);
}
}
return;
}
data = new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
let remaining = data.byteLength;
if (remaining === 0) return;
do {
checkAborted(signal);
const { bytesWritten } =
await write(filehandle, data, 0,
MathMin(kWriteFileMaxChunkSize, data.byteLength));
remaining -= bytesWritten;
data = new Uint8Array(
data.buffer,
data.byteOffset + bytesWritten,
data.byteLength - bytesWritten
);
} while (remaining > 0);
}
async function readFileHandle(filehandle, options) {
const signal = options?.signal;
checkAborted(signal);
const statFields = await binding.fstat(filehandle.fd, false, kUsePromises);
checkAborted(signal);
let size;
if ((statFields[1/* mode */] & S_IFMT) === S_IFREG) {
size = statFields[8/* size */];
} else {
size = 0;
}
if (size > kIoMaxLength)
throw new ERR_FS_FILE_TOO_LARGE(size);
let endOfFile = false;
let totalRead = 0;
const noSize = size === 0;
const buffers = [];
const fullBuffer = noSize ? undefined : Buffer.allocUnsafeSlow(size);
do {
checkAborted(signal);
let buffer;
let offset;
let length;
if (noSize) {
buffer = Buffer.allocUnsafeSlow(kReadFileUnknownBufferLength);
offset = 0;
length = kReadFileUnknownBufferLength;
} else {
buffer = fullBuffer;
offset = totalRead;
length = MathMin(size - totalRead, kReadFileBufferLength);
}
const bytesRead = (await binding.read(filehandle.fd, buffer, offset,
length, -1, kUsePromises)) || 0;
totalRead += bytesRead;
endOfFile = bytesRead === 0 || totalRead === size;
if (noSize && bytesRead > 0) {
const isBufferFull = bytesRead === kReadFileUnknownBufferLength;
const chunkBuffer = isBufferFull ? buffer : buffer.slice(0, bytesRead);
ArrayPrototypePush(buffers, chunkBuffer);
}
} while (!endOfFile);
let result;
if (size > 0) {
result = totalRead === size ? fullBuffer : fullBuffer.slice(0, totalRead);
} else {
result = buffers.length === 1 ? buffers[0] : Buffer.concat(buffers,
totalRead);
}
return options.encoding ? result.toString(options.encoding) : result;
}
// All of the functions are defined as async in order to ensure that errors
// thrown cause promise rejections rather than being thrown synchronously.
async function access(path, mode = F_OK) {
path = getValidatedPath(path);
mode = getValidMode(mode, 'access');
return binding.access(pathModule.toNamespacedPath(path), mode,
kUsePromises);
}
async function cp(src, dest, options) {
options = validateCpOptions(options);
src = pathModule.toNamespacedPath(getValidatedPath(src, 'src'));
dest = pathModule.toNamespacedPath(getValidatedPath(dest, 'dest'));
return lazyLoadCpPromises()(src, dest, options);
}
async function copyFile(src, dest, mode) {
src = getValidatedPath(src, 'src');
dest = getValidatedPath(dest, 'dest');
mode = getValidMode(mode, 'copyFile');
return binding.copyFile(pathModule.toNamespacedPath(src),
pathModule.toNamespacedPath(dest),
mode,
kUsePromises);
}
// Note that unlike fs.open() which uses numeric file descriptors,
// fsPromises.open() uses the fs.FileHandle class.
async function open(path, flags, mode) {
path = getValidatedPath(path);
const flagsNumber = stringToFlags(flags);
mode = parseFileMode(mode, 'mode', 0o666);
return new FileHandle(
await binding.openFileHandle(pathModule.toNamespacedPath(path),
flagsNumber, mode, kUsePromises));
}
async function read(handle, bufferOrParams, offset, length, position) {
let buffer = bufferOrParams;
if (!isArrayBufferView(buffer)) {
// This is fh.read(params)
({
buffer = Buffer.alloc(16384),
offset = 0,
length = buffer.byteLength - offset,
position = null,
} = bufferOrParams ?? kEmptyObject);
validateBuffer(buffer);
}
if (offset !== null && typeof offset === 'object') {
// This is fh.read(buffer, options)
({
offset = 0,
length = buffer.byteLength - offset,
position = null,
} = offset);
}
if (offset == null) {
offset = 0;
} else {
validateInteger(offset, 'offset', 0);
}
length |= 0;
if (length === 0)
return { bytesRead: length, buffer };
if (buffer.byteLength === 0) {
throw new ERR_INVALID_ARG_VALUE('buffer', buffer,
'is empty and cannot be written');
}
validateOffsetLengthRead(offset, length, buffer.byteLength);
if (!NumberIsSafeInteger(position))
position = -1;
const bytesRead = (await binding.read(handle.fd, buffer, offset, length,
position, kUsePromises)) || 0;
return { bytesRead, buffer };
}
async function readv(handle, buffers, position) {
validateBufferArray(buffers);
if (typeof position !== 'number')
position = null;
const bytesRead = (await binding.readBuffers(handle.fd, buffers, position,
kUsePromises)) || 0;
return { bytesRead, buffers };
}
async function write(handle, buffer, offsetOrOptions, length, position) {
if (buffer?.byteLength === 0)
return { bytesWritten: 0, buffer };
let offset = offsetOrOptions;
if (isArrayBufferView(buffer)) {
if (typeof offset === 'object') {
({
offset = 0,
length = buffer.byteLength - offset,
position = null,
} = offsetOrOptions ?? kEmptyObject);
}
if (offset == null) {
offset = 0;
} else {
validateInteger(offset, 'offset', 0);
}
if (typeof length !== 'number')
length = buffer.byteLength - offset;
if (typeof position !== 'number')
position = null;
validateOffsetLengthWrite(offset, length, buffer.byteLength);
const bytesWritten =
(await binding.writeBuffer(handle.fd, buffer, offset,
length, position, kUsePromises)) || 0;
return { bytesWritten, buffer };
}
validatePrimitiveStringAfterArrayBufferView(buffer, 'buffer');
validateEncoding(buffer, length);
const bytesWritten = (await binding.writeString(handle.fd, buffer, offset,
length, kUsePromises)) || 0;
return { bytesWritten, buffer };
}
async function writev(handle, buffers, position) {
validateBufferArray(buffers);
if (typeof position !== 'number')
position = null;
if (buffers.length === 0) {
return { bytesWritten: 0, buffers };
}
const bytesWritten = (await binding.writeBuffers(handle.fd, buffers, position,
kUsePromises)) || 0;
return { bytesWritten, buffers };
}
async function rename(oldPath, newPath) {
oldPath = getValidatedPath(oldPath, 'oldPath');
newPath = getValidatedPath(newPath, 'newPath');
return binding.rename(pathModule.toNamespacedPath(oldPath),
pathModule.toNamespacedPath(newPath),
kUsePromises);
}
async function truncate(path, len = 0) {
const fd = await open(path, 'r+');
return handleFdClose(ftruncate(fd, len), fd.close);
}
async function ftruncate(handle, len = 0) {
validateInteger(len, 'len');
len = MathMax(0, len);
return binding.ftruncate(handle.fd, len, kUsePromises);
}
async function rm(path, options) {
path = pathModule.toNamespacedPath(getValidatedPath(path));
options = await validateRmOptionsPromise(path, options, false);
return rimrafPromises(path, options);
}
async function rmdir(path, options) {
path = pathModule.toNamespacedPath(getValidatedPath(path));
options = validateRmdirOptions(options);
if (options.recursive) {
emitRecursiveRmdirWarning();
const stats = await stat(path);
if (stats.isDirectory()) {
return rimrafPromises(path, options);
}
}
return binding.rmdir(path, kUsePromises);
}
async function fdatasync(handle) {
return binding.fdatasync(handle.fd, kUsePromises);
}
async function fsync(handle) {
return binding.fsync(handle.fd, kUsePromises);
}
async function mkdir(path, options) {
if (typeof options === 'number' || typeof options === 'string') {
options = { mode: options };
}
const {
recursive = false,
mode = 0o777
} = options || kEmptyObject;
path = getValidatedPath(path);
validateBoolean(recursive, 'options.recursive');
return binding.mkdir(pathModule.toNamespacedPath(path),
parseFileMode(mode, 'mode', 0o777), recursive,
kUsePromises);
}
async function readdir(path, options) {
options = getOptions(options);
path = getValidatedPath(path);
const result = await binding.readdir(pathModule.toNamespacedPath(path),
options.encoding,
!!options.withFileTypes,
kUsePromises);
return options.withFileTypes ?
getDirectoryEntriesPromise(path, result) :
result;
}
async function readlink(path, options) {
options = getOptions(options);
path = getValidatedPath(path, 'oldPath');
return binding.readlink(pathModule.toNamespacedPath(path),
options.encoding, kUsePromises);
}
async function symlink(target, path, type_) {
const type = (typeof type_ === 'string' ? type_ : null);
target = getValidatedPath(target, 'target');
path = getValidatedPath(path);
return binding.symlink(preprocessSymlinkDestination(target, type, path),
pathModule.toNamespacedPath(path),
stringToSymlinkType(type),
kUsePromises);
}
async function fstat(handle, options = { bigint: false }) {
const result = await binding.fstat(handle.fd, options.bigint, kUsePromises);
return getStatsFromBinding(result);
}
async function lstat(path, options = { bigint: false }) {
path = getValidatedPath(path);
const result = await binding.lstat(pathModule.toNamespacedPath(path),
options.bigint, kUsePromises);
return getStatsFromBinding(result);
}
async function stat(path, options = { bigint: false }) {
path = getValidatedPath(path);
const result = await binding.stat(pathModule.toNamespacedPath(path),
options.bigint, kUsePromises);
return getStatsFromBinding(result);
}
async function link(existingPath, newPath) {
existingPath = getValidatedPath(existingPath, 'existingPath');
newPath = getValidatedPath(newPath, 'newPath');
return binding.link(pathModule.toNamespacedPath(existingPath),
pathModule.toNamespacedPath(newPath),
kUsePromises);
}
async function unlink(path) {
path = getValidatedPath(path);
return binding.unlink(pathModule.toNamespacedPath(path), kUsePromises);
}
async function fchmod(handle, mode) {
mode = parseFileMode(mode, 'mode');
return binding.fchmod(handle.fd, mode, kUsePromises);
}
async function chmod(path, mode) {
path = getValidatedPath(path);
mode = parseFileMode(mode, 'mode');
return binding.chmod(pathModule.toNamespacedPath(path), mode, kUsePromises);
}
async function lchmod(path, mode) {
if (O_SYMLINK === undefined)
throw new ERR_METHOD_NOT_IMPLEMENTED('lchmod()');
const fd = await open(path, O_WRONLY | O_SYMLINK);
return handleFdClose(fchmod(fd, mode), fd.close);
}
async function lchown(path, uid, gid) {
path = getValidatedPath(path);
validateInteger(uid, 'uid', -1, kMaxUserId);
validateInteger(gid, 'gid', -1, kMaxUserId);
return binding.lchown(pathModule.toNamespacedPath(path),
uid, gid, kUsePromises);
}
async function fchown(handle, uid, gid) {
validateInteger(uid, 'uid', -1, kMaxUserId);
validateInteger(gid, 'gid', -1, kMaxUserId);
return binding.fchown(handle.fd, uid, gid, kUsePromises);
}
async function chown(path, uid, gid) {
path = getValidatedPath(path);
validateInteger(uid, 'uid', -1, kMaxUserId);
validateInteger(gid, 'gid', -1, kMaxUserId);
return binding.chown(pathModule.toNamespacedPath(path),
uid, gid, kUsePromises);
}
async function utimes(path, atime, mtime) {
path = getValidatedPath(path);
return binding.utimes(pathModule.toNamespacedPath(path),
toUnixTimestamp(atime),
toUnixTimestamp(mtime),
kUsePromises);
}
async function futimes(handle, atime, mtime) {
atime = toUnixTimestamp(atime, 'atime');
mtime = toUnixTimestamp(mtime, 'mtime');
return binding.futimes(handle.fd, atime, mtime, kUsePromises);
}
async function lutimes(path, atime, mtime) {
path = getValidatedPath(path);
return binding.lutimes(pathModule.toNamespacedPath(path),
toUnixTimestamp(atime),
toUnixTimestamp(mtime),
kUsePromises);
}
async function realpath(path, options) {
options = getOptions(options);
path = getValidatedPath(path);
return binding.realpath(path, options.encoding, kUsePromises);
}
async function mkdtemp(prefix, options) {
options = getOptions(options);
validateString(prefix, 'prefix');
nullCheck(prefix);
warnOnNonPortableTemplate(prefix);
return binding.mkdtemp(`${prefix}XXXXXX`, options.encoding, kUsePromises);
}
async function writeFile(path, data, options) {
options = getOptions(options, { encoding: 'utf8', mode: 0o666, flag: 'w' });
const flag = options.flag || 'w';
if (!isArrayBufferView(data) && !isCustomIterable(data)) {
validatePrimitiveStringAfterArrayBufferView(data, 'data');
data = Buffer.from(data, options.encoding || 'utf8');
}
validateAbortSignal(options.signal);
if (path instanceof FileHandle)
return writeFileHandle(path, data, options.signal, options.encoding);
checkAborted(options.signal);
const fd = await open(path, flag, options.mode);
return handleFdClose(
writeFileHandle(fd, data, options.signal, options.encoding), fd.close);
}
function isCustomIterable(obj) {
return isIterable(obj) && !isArrayBufferView(obj) && typeof obj !== 'string';
}
async function appendFile(path, data, options) {
options = getOptions(options, { encoding: 'utf8', mode: 0o666, flag: 'a' });
options = copyObject(options);
options.flag = options.flag || 'a';
return writeFile(path, data, options);
}
async function readFile(path, options) {
options = getOptions(options, { flag: 'r' });
const flag = options.flag || 'r';
if (path instanceof FileHandle)
return readFileHandle(path, options);
checkAborted(options.signal);
const fd = await open(path, flag, 0o666);
return handleFdClose(readFileHandle(fd, options), fd.close);
}
module.exports = {
exports: {
access,
copyFile,
cp,
open,
opendir: promisify(opendir),
rename,
truncate,
rm,
rmdir,
mkdir,
readdir,
readlink,
symlink,
lstat,
stat,
link,
unlink,
chmod,
lchmod,
lchown,
chown,
utimes,
lutimes,
realpath,
mkdtemp,
writeFile,
appendFile,
readFile,
watch,
constants,
},
FileHandle,
kRef,
kUnref,
};
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