381 lines
12 KiB
JavaScript
381 lines
12 KiB
JavaScript
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'use strict';
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const Readable = require('stream').Readable;
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const EventEmitter = require('events').EventEmitter;
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const path = require('path');
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const normalizeOptions = require('./normalize-options');
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const stat = require('./stat');
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const call = require('./call');
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/**
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* Asynchronously reads the contents of a directory and streams the results
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* via a {@link stream.Readable}.
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*/
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class DirectoryReader {
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/**
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* @param {string} dir - The absolute or relative directory path to read
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* @param {object} [options] - User-specified options, if any (see {@link normalizeOptions})
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* @param {object} internalOptions - Internal options that aren't part of the public API
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* @class
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*/
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constructor (dir, options, internalOptions) {
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this.options = options = normalizeOptions(options, internalOptions);
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// Indicates whether we should keep reading
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// This is set false if stream.Readable.push() returns false.
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this.shouldRead = true;
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// The directories to read
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// (initialized with the top-level directory)
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this.queue = [{
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path: dir,
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basePath: options.basePath,
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posixBasePath: options.posixBasePath,
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depth: 0
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}];
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// The number of directories that are currently being processed
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this.pending = 0;
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// The data that has been read, but not yet emitted
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this.buffer = [];
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this.stream = new Readable({ objectMode: true });
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this.stream._read = () => {
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// Start (or resume) reading
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this.shouldRead = true;
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// If we have data in the buffer, then send the next chunk
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if (this.buffer.length > 0) {
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this.pushFromBuffer();
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}
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// If we have directories queued, then start processing the next one
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if (this.queue.length > 0) {
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if (this.options.facade.sync) {
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while (this.queue.length > 0) {
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this.readNextDirectory();
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}
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}
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else {
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this.readNextDirectory();
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}
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}
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this.checkForEOF();
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};
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}
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/**
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* Reads the next directory in the queue
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*/
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readNextDirectory () {
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let facade = this.options.facade;
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let dir = this.queue.shift();
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this.pending++;
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// Read the directory listing
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call.safe(facade.fs.readdir, dir.path, (err, items) => {
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if (err) {
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// fs.readdir threw an error
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this.emit('error', err);
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return this.finishedReadingDirectory();
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}
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try {
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// Process each item in the directory (simultaneously, if async)
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facade.forEach(
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items,
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this.processItem.bind(this, dir),
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this.finishedReadingDirectory.bind(this, dir)
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);
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}
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catch (err2) {
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// facade.forEach threw an error
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// (probably because fs.readdir returned an invalid result)
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this.emit('error', err2);
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this.finishedReadingDirectory();
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}
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});
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}
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/**
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* This method is called after all items in a directory have been processed.
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*
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* NOTE: This does not necessarily mean that the reader is finished, since there may still
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* be other directories queued or pending.
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*/
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finishedReadingDirectory () {
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this.pending--;
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if (this.shouldRead) {
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// If we have directories queued, then start processing the next one
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if (this.queue.length > 0 && this.options.facade.async) {
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this.readNextDirectory();
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}
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this.checkForEOF();
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}
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}
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/**
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* Determines whether the reader has finished processing all items in all directories.
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* If so, then the "end" event is fired (via {@Readable#push})
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*/
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checkForEOF () {
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if (this.buffer.length === 0 && // The stuff we've already read
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this.pending === 0 && // The stuff we're currently reading
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this.queue.length === 0) { // The stuff we haven't read yet
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// There's no more stuff!
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this.stream.push(null);
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}
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}
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/**
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* Processes a single item in a directory.
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*
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* If the item is a directory, and `option.deep` is enabled, then the item will be added
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* to the directory queue.
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*
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* If the item meets the filter criteria, then it will be emitted to the reader's stream.
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*
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* @param {object} dir - A directory object from the queue
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* @param {string} item - The name of the item (name only, no path)
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* @param {function} done - A callback function that is called after the item has been processed
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*/
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processItem (dir, item, done) {
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let stream = this.stream;
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let options = this.options;
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let itemPath = dir.basePath + item;
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let posixPath = dir.posixBasePath + item;
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let fullPath = path.join(dir.path, item);
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// If `options.deep` is a number, and we've already recursed to the max depth,
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// then there's no need to check fs.Stats to know if it's a directory.
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// If `options.deep` is a function, then we'll need fs.Stats
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let maxDepthReached = dir.depth >= options.recurseDepth;
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// Do we need to call `fs.stat`?
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let needStats =
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!maxDepthReached || // we need the fs.Stats to know if it's a directory
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options.stats || // the user wants fs.Stats objects returned
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options.recurseFn || // we need fs.Stats for the recurse function
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options.filterFn || // we need fs.Stats for the filter function
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EventEmitter.listenerCount(stream, 'file') || // we need the fs.Stats to know if it's a file
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EventEmitter.listenerCount(stream, 'directory') || // we need the fs.Stats to know if it's a directory
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EventEmitter.listenerCount(stream, 'symlink'); // we need the fs.Stats to know if it's a symlink
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// If we don't need stats, then exit early
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if (!needStats) {
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if (this.filter(itemPath, posixPath)) {
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this.pushOrBuffer({ data: itemPath });
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}
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return done();
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}
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// Get the fs.Stats object for this path
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stat(options.facade.fs, fullPath, (err, stats) => {
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if (err) {
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// fs.stat threw an error
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this.emit('error', err);
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return done();
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}
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try {
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// Add the item's path to the fs.Stats object
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// The base of this path, and its separators are determined by the options
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// (i.e. options.basePath and options.sep)
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stats.path = itemPath;
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// Add depth of the path to the fs.Stats object for use this in the filter function
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stats.depth = dir.depth;
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if (this.shouldRecurse(stats, posixPath, maxDepthReached)) {
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// Add this subdirectory to the queue
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this.queue.push({
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path: fullPath,
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basePath: itemPath + options.sep,
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posixBasePath: posixPath + '/',
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depth: dir.depth + 1,
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});
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}
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// Determine whether this item matches the filter criteria
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if (this.filter(stats, posixPath)) {
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this.pushOrBuffer({
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data: options.stats ? stats : itemPath,
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file: stats.isFile(),
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directory: stats.isDirectory(),
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symlink: stats.isSymbolicLink(),
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});
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}
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done();
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}
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catch (err2) {
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// An error occurred while processing the item
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// (probably during a user-specified function, such as options.deep, options.filter, etc.)
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this.emit('error', err2);
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done();
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}
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});
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}
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/**
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* Pushes the given chunk of data to the stream, or adds it to the buffer,
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* depending on the state of the stream.
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*
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* @param {object} chunk
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*/
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pushOrBuffer (chunk) {
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// Add the chunk to the buffer
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this.buffer.push(chunk);
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// If we're still reading, then immediately emit the next chunk in the buffer
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// (which may or may not be the chunk that we just added)
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if (this.shouldRead) {
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this.pushFromBuffer();
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}
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}
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/**
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* Immediately pushes the next chunk in the buffer to the reader's stream.
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* The "data" event will always be fired (via {@link Readable#push}).
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* In addition, the "file", "directory", and/or "symlink" events may be fired,
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* depending on the type of properties of the chunk.
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*/
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pushFromBuffer () {
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let stream = this.stream;
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let chunk = this.buffer.shift();
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// Stream the data
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try {
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this.shouldRead = stream.push(chunk.data);
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}
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catch (err) {
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this.emit('error', err);
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}
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// Also emit specific events, based on the type of chunk
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chunk.file && this.emit('file', chunk.data);
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chunk.symlink && this.emit('symlink', chunk.data);
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chunk.directory && this.emit('directory', chunk.data);
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}
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/**
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* Determines whether the given directory meets the user-specified recursion criteria.
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* If the user didn't specify recursion criteria, then this function will default to true.
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*
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* @param {fs.Stats} stats - The directory's {@link fs.Stats} object
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* @param {string} posixPath - The item's POSIX path (used for glob matching)
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* @param {boolean} maxDepthReached - Whether we've already crawled the user-specified depth
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* @returns {boolean}
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*/
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shouldRecurse (stats, posixPath, maxDepthReached) {
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let options = this.options;
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if (maxDepthReached) {
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// We've already crawled to the maximum depth. So no more recursion.
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return false;
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}
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else if (!stats.isDirectory()) {
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// It's not a directory. So don't try to crawl it.
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return false;
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}
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else if (options.recurseGlob) {
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// Glob patterns are always tested against the POSIX path, even on Windows
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// https://github.com/isaacs/node-glob#windows
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return options.recurseGlob.test(posixPath);
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}
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else if (options.recurseRegExp) {
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// Regular expressions are tested against the normal path
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// (based on the OS or options.sep)
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return options.recurseRegExp.test(stats.path);
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}
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else if (options.recurseFn) {
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try {
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// Run the user-specified recursion criteria
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return options.recurseFn.call(null, stats);
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}
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catch (err) {
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// An error occurred in the user's code.
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// In Sync and Async modes, this will return an error.
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// In Streaming mode, we emit an "error" event, but continue processing
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this.emit('error', err);
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}
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}
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else {
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// No recursion function was specified, and we're within the maximum depth.
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// So crawl this directory.
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return true;
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}
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}
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/**
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* Determines whether the given item meets the user-specified filter criteria.
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* If the user didn't specify a filter, then this function will always return true.
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*
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* @param {string|fs.Stats} value - Either the item's path, or the item's {@link fs.Stats} object
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* @param {string} posixPath - The item's POSIX path (used for glob matching)
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* @returns {boolean}
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*/
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filter (value, posixPath) {
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let options = this.options;
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if (options.filterGlob) {
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// Glob patterns are always tested against the POSIX path, even on Windows
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// https://github.com/isaacs/node-glob#windows
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return options.filterGlob.test(posixPath);
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}
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else if (options.filterRegExp) {
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// Regular expressions are tested against the normal path
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// (based on the OS or options.sep)
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return options.filterRegExp.test(value.path || value);
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}
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else if (options.filterFn) {
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try {
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// Run the user-specified filter function
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return options.filterFn.call(null, value);
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}
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catch (err) {
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// An error occurred in the user's code.
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// In Sync and Async modes, this will return an error.
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// In Streaming mode, we emit an "error" event, but continue processing
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this.emit('error', err);
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}
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}
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else {
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// No filter was specified, so match everything
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return true;
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}
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}
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/**
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* Emits an event. If one of the event listeners throws an error,
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* then an "error" event is emitted.
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*
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* @param {string} eventName
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* @param {*} data
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*/
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emit (eventName, data) {
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let stream = this.stream;
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try {
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stream.emit(eventName, data);
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}
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catch (err) {
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if (eventName === 'error') {
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// Don't recursively emit "error" events.
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// If the first one fails, then just throw
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throw err;
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}
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else {
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stream.emit('error', err);
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}
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}
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}
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}
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module.exports = DirectoryReader;
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