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const {
ArrayPrototypePush,
ArrayPrototypeSlice,
ArrayPrototypeSplice,
FunctionPrototypeBind,
ObjectDefineProperty,
PromiseReject,
Symbol,
SymbolAsyncIterator,
} = primordials;
const pathModule = require('path');
const binding = internalBinding('fs');
const dirBinding = internalBinding('fs_dir');
const {
codes: {
ERR_DIR_CLOSED,
ERR_DIR_CONCURRENT_OPERATION,
ERR_MISSING_ARGS
}
} = require('internal/errors');
const { FSReqCallback } = binding;
const internalUtil = require('internal/util');
const {
getDirent,
getOptions,
getValidatedPath,
handleErrorFromBinding
} = require('internal/fs/utils');
const {
validateFunction,
validateUint32
} = require('internal/validators');
const kDirHandle = Symbol('kDirHandle');
const kDirPath = Symbol('kDirPath');
const kDirBufferedEntries = Symbol('kDirBufferedEntries');
const kDirClosed = Symbol('kDirClosed');
const kDirOptions = Symbol('kDirOptions');
const kDirReadImpl = Symbol('kDirReadImpl');
const kDirReadPromisified = Symbol('kDirReadPromisified');
const kDirClosePromisified = Symbol('kDirClosePromisified');
const kDirOperationQueue = Symbol('kDirOperationQueue');
class Dir {
constructor(handle, path, options) {
if (handle == null) throw new ERR_MISSING_ARGS('handle');
this[kDirHandle] = handle;
this[kDirBufferedEntries] = [];
this[kDirPath] = path;
this[kDirClosed] = false;
// Either `null` or an Array of pending operations (= functions to be called
// once the current operation is done).
this[kDirOperationQueue] = null;
this[kDirOptions] = {
bufferSize: 32,
...getOptions(options, {
encoding: 'utf8'
})
};
validateUint32(this[kDirOptions].bufferSize, 'options.bufferSize', true);
this[kDirReadPromisified] = FunctionPrototypeBind(
internalUtil.promisify(this[kDirReadImpl]), this, false);
this[kDirClosePromisified] = FunctionPrototypeBind(
internalUtil.promisify(this.close), this);
}
get path() {
return this[kDirPath];
}
read(callback) {
return this[kDirReadImpl](true, callback);
}
[kDirReadImpl](maybeSync, callback) {
if (this[kDirClosed] === true) {
throw new ERR_DIR_CLOSED();
}
if (callback === undefined) {
return this[kDirReadPromisified]();
}
validateFunction(callback, 'callback');
if (this[kDirOperationQueue] !== null) {
ArrayPrototypePush(this[kDirOperationQueue], () => {
this[kDirReadImpl](maybeSync, callback);
});
return;
}
if (this[kDirBufferedEntries].length > 0) {
const { 0: name, 1: type } =
ArrayPrototypeSplice(this[kDirBufferedEntries], 0, 2);
if (maybeSync)
process.nextTick(getDirent, this[kDirPath], name, type, callback);
else
getDirent(this[kDirPath], name, type, callback);
return;
}
const req = new FSReqCallback();
req.oncomplete = (err, result) => {
process.nextTick(() => {
const queue = this[kDirOperationQueue];
this[kDirOperationQueue] = null;
for (const op of queue) op();
});
if (err || result === null) {
return callback(err, result);
}
this[kDirBufferedEntries] = ArrayPrototypeSlice(result, 2);
getDirent(this[kDirPath], result[0], result[1], callback);
};
this[kDirOperationQueue] = [];
this[kDirHandle].read(
this[kDirOptions].encoding,
this[kDirOptions].bufferSize,
req
);
}
readSync() {
if (this[kDirClosed] === true) {
throw new ERR_DIR_CLOSED();
}
if (this[kDirOperationQueue] !== null) {
throw new ERR_DIR_CONCURRENT_OPERATION();
}
if (this[kDirBufferedEntries].length > 0) {
const { 0: name, 1: type } =
ArrayPrototypeSplice(this[kDirBufferedEntries], 0, 2);
return getDirent(this[kDirPath], name, type);
}
const ctx = { path: this[kDirPath] };
const result = this[kDirHandle].read(
this[kDirOptions].encoding,
this[kDirOptions].bufferSize,
undefined,
ctx
);
handleErrorFromBinding(ctx);
if (result === null) {
return result;
}
this[kDirBufferedEntries] = ArrayPrototypeSlice(result, 2);
return getDirent(this[kDirPath], result[0], result[1]);
}
close(callback) {
// Promise
if (callback === undefined) {
if (this[kDirClosed] === true) {
return PromiseReject(new ERR_DIR_CLOSED());
}
return this[kDirClosePromisified]();
}
// callback
validateFunction(callback, 'callback');
if (this[kDirClosed] === true) {
process.nextTick(callback, new ERR_DIR_CLOSED());
return;
}
if (this[kDirOperationQueue] !== null) {
ArrayPrototypePush(this[kDirOperationQueue], () => {
this.close(callback);
});
return;
}
this[kDirClosed] = true;
const req = new FSReqCallback();
req.oncomplete = callback;
this[kDirHandle].close(req);
}
closeSync() {
if (this[kDirClosed] === true) {
throw new ERR_DIR_CLOSED();
}
if (this[kDirOperationQueue] !== null) {
throw new ERR_DIR_CONCURRENT_OPERATION();
}
this[kDirClosed] = true;
const ctx = { path: this[kDirPath] };
const result = this[kDirHandle].close(undefined, ctx);
handleErrorFromBinding(ctx);
return result;
}
async* entries() {
try {
while (true) {
const result = await this[kDirReadPromisified]();
if (result === null) {
break;
}
yield result;
}
} finally {
await this[kDirClosePromisified]();
}
}
}
ObjectDefineProperty(Dir.prototype, SymbolAsyncIterator, {
__proto__: null,
value: Dir.prototype.entries,
enumerable: false,
writable: true,
configurable: true,
});
function opendir(path, options, callback) {
callback = typeof options === 'function' ? options : callback;
validateFunction(callback, 'callback');
path = getValidatedPath(path);
options = getOptions(options, {
encoding: 'utf8'
});
function opendirCallback(error, handle) {
if (error) {
callback(error);
} else {
callback(null, new Dir(handle, path, options));
}
}
const req = new FSReqCallback();
req.oncomplete = opendirCallback;
dirBinding.opendir(
pathModule.toNamespacedPath(path),
options.encoding,
req
);
}
function opendirSync(path, options) {
path = getValidatedPath(path);
options = getOptions(options, {
encoding: 'utf8'
});
const ctx = { path };
const handle = dirBinding.opendir(
pathModule.toNamespacedPath(path),
options.encoding,
undefined,
ctx
);
handleErrorFromBinding(ctx);
return new Dir(handle, path, options);
}
module.exports = {
Dir,
opendir,
opendirSync
};
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