browserfs
Version:
A filesystem in your browser!
291 lines • 40.1 kB
JavaScript
"use strict";
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var file_system = require('../core/file_system');
var InMemory_1 = require('./InMemory');
var api_error_1 = require('../core/api_error');
var fs = require('../core/node_fs');
var path = require('path');
var util_1 = require('../core/util');
var MountableFileSystem = (function (_super) {
__extends(MountableFileSystem, _super);
function MountableFileSystem() {
_super.call(this);
this.mountList = [];
this.mntMap = {};
this.rootFs = new InMemory_1["default"]();
}
MountableFileSystem.prototype.mount = function (mountPoint, fs) {
if (mountPoint[0] !== '/') {
mountPoint = "/" + mountPoint;
}
mountPoint = path.resolve(mountPoint);
if (this.mntMap[mountPoint]) {
throw new api_error_1.ApiError(api_error_1.ErrorCode.EINVAL, "Mount point " + mountPoint + " is already taken.");
}
util_1.mkdirpSync(mountPoint, 0x1ff, this.rootFs);
this.mntMap[mountPoint] = fs;
this.mountList.push(mountPoint);
this.mountList = this.mountList.sort(function (a, b) { return b.length - a.length; });
};
MountableFileSystem.prototype.umount = function (mountPoint) {
if (mountPoint[0] !== '/') {
mountPoint = "/" + mountPoint;
}
mountPoint = path.resolve(mountPoint);
if (!this.mntMap[mountPoint]) {
throw new api_error_1.ApiError(api_error_1.ErrorCode.EINVAL, "Mount point " + mountPoint + " is already unmounted.");
}
delete this.mntMap[mountPoint];
this.mountList.splice(this.mountList.indexOf(mountPoint), 1);
while (mountPoint !== '/') {
if (this.rootFs.readdirSync(mountPoint).length === 0) {
this.rootFs.rmdirSync(mountPoint);
mountPoint = path.dirname(mountPoint);
}
else {
break;
}
}
};
MountableFileSystem.prototype._getFs = function (path) {
var mountList = this.mountList, len = mountList.length;
for (var i_1 = 0; i_1 < len; i_1++) {
var mountPoint = mountList[i_1];
if (mountPoint.length <= path.length && path.indexOf(mountPoint) === 0) {
path = path.substr(mountPoint.length > 1 ? mountPoint.length : 0);
if (path === '') {
path = '/';
}
return { fs: this.mntMap[mountPoint], path: path };
}
}
return { fs: this.rootFs, path: path };
};
MountableFileSystem.prototype.getName = function () {
return 'MountableFileSystem';
};
MountableFileSystem.isAvailable = function () {
return true;
};
MountableFileSystem.prototype.diskSpace = function (path, cb) {
cb(0, 0);
};
MountableFileSystem.prototype.isReadOnly = function () {
return false;
};
MountableFileSystem.prototype.supportsLinks = function () {
return false;
};
MountableFileSystem.prototype.supportsProps = function () {
return false;
};
MountableFileSystem.prototype.supportsSynch = function () {
return true;
};
MountableFileSystem.prototype.standardizeError = function (err, path, realPath) {
var index;
if (-1 !== (index = err.message.indexOf(path))) {
err.message = err.message.substr(0, index) + realPath + err.message.substr(index + path.length);
err.path = realPath;
}
return err;
};
MountableFileSystem.prototype.rename = function (oldPath, newPath, cb) {
var fs1_rv = this._getFs(oldPath);
var fs2_rv = this._getFs(newPath);
if (fs1_rv.fs === fs2_rv.fs) {
var _this = this;
return fs1_rv.fs.rename(fs1_rv.path, fs2_rv.path, function (e) {
if (e)
_this.standardizeError(_this.standardizeError(e, fs1_rv.path, oldPath), fs2_rv.path, newPath);
cb(e);
});
}
return fs.readFile(oldPath, function (err, data) {
if (err) {
return cb(err);
}
fs.writeFile(newPath, data, function (err) {
if (err) {
return cb(err);
}
fs.unlink(oldPath, cb);
});
});
};
MountableFileSystem.prototype.renameSync = function (oldPath, newPath) {
var fs1_rv = this._getFs(oldPath);
var fs2_rv = this._getFs(newPath);
if (fs1_rv.fs === fs2_rv.fs) {
try {
return fs1_rv.fs.renameSync(fs1_rv.path, fs2_rv.path);
}
catch (e) {
this.standardizeError(this.standardizeError(e, fs1_rv.path, oldPath), fs2_rv.path, newPath);
throw e;
}
}
var data = fs.readFileSync(oldPath);
fs.writeFileSync(newPath, data);
return fs.unlinkSync(oldPath);
};
MountableFileSystem.prototype.readdirSync = function (p) {
var fsInfo = this._getFs(p);
var rv = null;
if (fsInfo.fs !== this.rootFs) {
try {
rv = this.rootFs.readdirSync(p);
}
catch (e) {
}
}
try {
var rv2_1 = fsInfo.fs.readdirSync(fsInfo.path);
if (rv === null) {
return rv2_1;
}
else {
return rv2_1.concat(rv.filter(function (val) { return rv2_1.indexOf(val) === -1; }));
}
}
catch (e) {
if (rv === null) {
throw this.standardizeError(e, fsInfo.path, p);
}
else {
return rv;
}
}
};
MountableFileSystem.prototype.readdir = function (p, cb) {
var _this = this;
var fsInfo = this._getFs(p);
fsInfo.fs.readdir(fsInfo.path, function (err, files) {
if (fsInfo.fs !== _this.rootFs) {
try {
var rv = _this.rootFs.readdirSync(p);
if (files) {
files = files.concat(rv.filter(function (val) { return files.indexOf(val) === -1; }));
}
else {
files = rv;
}
}
catch (e) {
if (err) {
return cb(_this.standardizeError(err, fsInfo.path, p));
}
}
}
else if (err) {
return cb(_this.standardizeError(err, fsInfo.path, p));
}
cb(null, files);
});
};
MountableFileSystem.prototype.rmdirSync = function (p) {
var fsInfo = this._getFs(p);
if (this._containsMountPt(p)) {
throw api_error_1.ApiError.ENOTEMPTY(p);
}
else {
try {
fsInfo.fs.rmdirSync(fsInfo.path);
}
catch (e) {
throw this.standardizeError(e, fsInfo.path, p);
}
}
};
MountableFileSystem.prototype._containsMountPt = function (p) {
var mountPoints = this.mountList, len = mountPoints.length;
for (var i_2 = 0; i_2 < len; i_2++) {
var pt = mountPoints[i_2];
if (pt.length >= p.length && pt.slice(0, p.length) === p) {
return true;
}
}
return false;
};
MountableFileSystem.prototype.rmdir = function (p, cb) {
var _this = this;
var fsInfo = this._getFs(p);
if (this._containsMountPt(p)) {
cb(api_error_1.ApiError.ENOTEMPTY(p));
}
else {
fsInfo.fs.rmdir(fsInfo.path, function (err) {
cb(err ? _this.standardizeError(err, fsInfo.path, p) : null);
});
}
};
return MountableFileSystem;
}(file_system.BaseFileSystem));
exports.__esModule = true;
exports["default"] = MountableFileSystem;
function defineFcn(name, isSync, numArgs) {
if (isSync) {
return function () {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i - 0] = arguments[_i];
}
var self = this;
var path = args[0];
var rv = self._getFs(path);
args[0] = rv.path;
try {
return rv.fs[name].apply(rv.fs, args);
}
catch (e) {
self.standardizeError(e, rv.path, path);
throw e;
}
};
}
else {
return function () {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i - 0] = arguments[_i];
}
var self = this;
var path = args[0];
var rv = self._getFs(path);
args[0] = rv.path;
if (typeof args[args.length - 1] === 'function') {
var cb = args[args.length - 1];
args[args.length - 1] = function () {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i - 0] = arguments[_i];
}
if (args.length > 0 && args[0] instanceof api_error_1.ApiError) {
self.standardizeError(args[0], rv.path, path);
}
cb.apply(null, args);
};
}
return rv.fs[name].apply(rv.fs, args);
};
}
}
var fsCmdMap = [
['exists', 'unlink', 'readlink'],
['stat', 'mkdir', 'realpath', 'truncate'],
['open', 'readFile', 'chmod', 'utimes'],
['chown'],
['writeFile', 'appendFile']];
for (var i = 0; i < fsCmdMap.length; i++) {
var cmds = fsCmdMap[i];
for (var j = 0; j < cmds.length; j++) {
var fnName = cmds[j];
MountableFileSystem.prototype[fnName] = defineFcn(fnName, false, i + 1);
MountableFileSystem.prototype[fnName + 'Sync'] = defineFcn(fnName + 'Sync', true, i + 1);
}
}
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file_system = require('../core/file_system');\nimport InMemoryFileSystem from './InMemory';\nimport {ApiError, ErrorCode} from '../core/api_error';\nimport fs = require('../core/node_fs');\nimport path = require('path');\nimport {mkdirpSync} from '../core/util';\n\n/**\n * The MountableFileSystem allows you to mount multiple backend types or\n * multiple instantiations of the same backend into a single file system tree.\n * The file systems do not need to know about each other; all interactions are\n * automatically facilitated through this interface.\n *\n * For example, if a file system is mounted at /mnt/blah, and a request came in\n * for /mnt/blah/foo.txt, the file system would see a request for /foo.txt.\n */\nexport default class MountableFileSystem extends file_system.BaseFileSystem implements file_system.FileSystem {\n  private mntMap: {[path: string]: file_system.FileSystem};\n  // Contains the list of mount points in mntMap, sorted by string length in decreasing order.\n  // Ensures that we scan the most specific mount points for a match first, which lets us\n  // nest mount points.\n  private mountList: string[] = [];\n  private rootFs: file_system.FileSystem;\n  constructor() {\n    super();\n    this.mntMap = {};\n    // The InMemory file system serves purely to provide directory listings for\n    // mounted file systems.\n    this.rootFs = new InMemoryFileSystem();\n  }\n\n  /**\n   * Mounts the file system at the given mount point.\n   */\n  public mount(mountPoint: string, fs: file_system.FileSystem): void {\n    if (mountPoint[0] !== '/') {\n      mountPoint = `/${mountPoint}`;\n    }\n    mountPoint = path.resolve(mountPoint);\n    if (this.mntMap[mountPoint]) {\n      throw new ApiError(ErrorCode.EINVAL, \"Mount point \" + mountPoint + \" is already taken.\");\n    }\n    mkdirpSync(mountPoint, 0x1ff, this.rootFs);\n    this.mntMap[mountPoint] = fs;\n    this.mountList.push(mountPoint);\n    this.mountList = this.mountList.sort((a, b) => b.length - a.length);\n  }\n\n  public umount(mountPoint: string): void {\n    if (mountPoint[0] !== '/') {\n      mountPoint = `/${mountPoint}`;\n    }\n    mountPoint = path.resolve(mountPoint);\n    if (!this.mntMap[mountPoint]) {\n      throw new ApiError(ErrorCode.EINVAL, \"Mount point \" + mountPoint + \" is already unmounted.\");\n    }\n    delete this.mntMap[mountPoint];\n    this.mountList.splice(this.mountList.indexOf(mountPoint), 1);\n\n    while (mountPoint !== '/') {\n      if (this.rootFs.readdirSync(mountPoint).length === 0) {\n        this.rootFs.rmdirSync(mountPoint);\n        mountPoint = path.dirname(mountPoint);\n      } else {\n        break;\n      }\n    }\n  }\n\n  /**\n   * Returns the file system that the path points to.\n   */\n  public _getFs(path: string): {fs: file_system.FileSystem; path: string} {\n    let mountList = this.mountList, len = mountList.length;\n    for (let i = 0; i < len; i++) {\n      let mountPoint = mountList[i];\n      // We know path is normalized, so it is a substring of the mount point.\n      if (mountPoint.length <= path.length && path.indexOf(mountPoint) === 0) {\n        path = path.substr(mountPoint.length > 1 ? mountPoint.length : 0);\n        if (path === '') {\n          path = '/';\n        }\n        return {fs: this.mntMap[mountPoint], path: path};\n      }\n    }\n    // Query our root file system.\n    return {fs: this.rootFs, path: path};\n  }\n\n  // Global information methods\n\n  public getName(): string {\n    return 'MountableFileSystem';\n  }\n\n  public static isAvailable(): boolean {\n    return true;\n  }\n\n  public diskSpace(path: string, cb: (total: number, free: number) => void): void {\n    cb(0, 0);\n  }\n\n  public isReadOnly(): boolean {\n    return false;\n  }\n\n  public supportsLinks(): boolean {\n    // I'm not ready for cross-FS links yet.\n    return false;\n  }\n\n  public supportsProps(): boolean {\n    return false;\n  }\n\n  public supportsSynch(): boolean {\n    return true;\n  }\n\n  /**\n   * Fixes up error messages so they mention the mounted file location relative\n   * to the MFS root, not to the particular FS's root.\n   * Mutates the input error, and returns it.\n   */\n  private standardizeError(err: ApiError, path: string, realPath: string): ApiError {\n    var index: number;\n    if (-1 !== (index = err.message.indexOf(path))) {\n      err.message = err.message.substr(0, index) + realPath + err.message.substr(index + path.length);\n      err.path = realPath;\n    }\n    return err;\n  }\n\n  // The following methods involve multiple file systems, and thus have custom\n  // logic.\n  // Note that we go through the Node API to use its robust default argument\n  // processing.\n\n  public rename(oldPath: string, newPath: string, cb: (e?: ApiError) => void): void {\n    // Scenario 1: old and new are on same FS.\n    var fs1_rv = this._getFs(oldPath);\n    var fs2_rv = this._getFs(newPath);\n    if (fs1_rv.fs === fs2_rv.fs) {\n      var _this = this;\n      return fs1_rv.fs.rename(fs1_rv.path, fs2_rv.path, function(e?: ApiError) {\n        if (e) _this.standardizeError(_this.standardizeError(e, fs1_rv.path, oldPath), fs2_rv.path, newPath);\n        cb(e);\n      });\n    }\n\n    // Scenario 2: Different file systems.\n    // Read old file, write new file, delete old file.\n    return fs.readFile(oldPath, function(err: ApiError, data?: any) {\n      if (err) {\n        return cb(err);\n      }\n      fs.writeFile(newPath, data, function(err) {\n        if (err) {\n          return cb(err);\n        }\n        fs.unlink(oldPath, cb);\n      });\n    });\n  }\n\n  public renameSync(oldPath: string, newPath: string): void {\n    // Scenario 1: old and new are on same FS.\n    var fs1_rv = this._getFs(oldPath);\n    var fs2_rv = this._getFs(newPath);\n    if (fs1_rv.fs === fs2_rv.fs) {\n      try {\n        return fs1_rv.fs.renameSync(fs1_rv.path, fs2_rv.path);\n      } catch(e) {\n        this.standardizeError(this.standardizeError(e, fs1_rv.path, oldPath), fs2_rv.path, newPath);\n        throw e;\n      }\n    }\n    // Scenario 2: Different file systems.\n    var data = fs.readFileSync(oldPath);\n    fs.writeFileSync(newPath, data);\n    return fs.unlinkSync(oldPath);\n  }\n\n  public readdirSync(p: string): string[] {\n    let fsInfo = this._getFs(p);\n\n    // If null, rootfs did not have the directory\n    // (or the target FS is the root fs).\n    let rv = null;\n    // Mount points are all defined in the root FS.\n    // Ensure that we list those, too.\n    if (fsInfo.fs !== this.rootFs) {\n      try {\n        rv = this.rootFs.readdirSync(p);\n      } catch (e) {\n        // Ignore.\n      }\n    }\n\n    try {\n      let rv2 = fsInfo.fs.readdirSync(fsInfo.path);\n      if (rv === null) {\n        return rv2;\n      } else {\n        // Filter out duplicates.\n        return rv2.concat(rv.filter((val) => rv2.indexOf(val) === -1));\n      }\n    } catch(e) {\n      if (rv === null) {\n        throw this.standardizeError(e, fsInfo.path, p);\n      } else {\n        // The root FS had something.\n        return rv;\n      }\n    }\n  }\n\n  public readdir(p: string, cb: (err: NodeJS.ErrnoException, listing?: string[]) => any): void {\n    let fsInfo = this._getFs(p);\n    fsInfo.fs.readdir(fsInfo.path, (err, files) => {\n      if (fsInfo.fs !== this.rootFs) {\n        try {\n          let rv = this.rootFs.readdirSync(p);\n          if (files) {\n            // Filter out duplicates.\n            files = files.concat(rv.filter((val) => files.indexOf(val) === -1));\n          } else {\n            files = rv;\n          }\n        } catch (e) {\n          // Root FS and target FS did not have directory.\n          if (err) {\n            return cb(this.standardizeError(err, fsInfo.path, p));\n          }\n        }\n      } else if (err) {\n        // Root FS and target FS are the same, and did not have directory.\n        return cb(this.standardizeError(err, fsInfo.path, p));\n      }\n\n      cb(null, files);\n    });\n  }\n\n  public rmdirSync(p: string): void {\n    let fsInfo = this._getFs(p);\n    if (this._containsMountPt(p)) {\n      throw ApiError.ENOTEMPTY(p);\n    } else {\n      try {\n        fsInfo.fs.rmdirSync(fsInfo.path);\n      } catch (e) {\n        throw this.standardizeError(e, fsInfo.path, p);\n      }\n    }\n  }\n\n  /**\n   * Returns true if the given path contains a mount point.\n   */\n  private _containsMountPt(p: string): boolean {\n    let mountPoints = this.mountList, len = mountPoints.length;\n    for (let i = 0; i < len; i++) {\n      let pt = mountPoints[i];\n      if (pt.length >= p.length && pt.slice(0, p.length) === p) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  public rmdir(p: string, cb: (err?: NodeJS.ErrnoException) => any): void {\n    let fsInfo = this._getFs(p);\n    if (this._containsMountPt(p)) {\n      cb(ApiError.ENOTEMPTY(p));\n    } else {\n      fsInfo.fs.rmdir(fsInfo.path, (err?) => {\n        cb(err ? this.standardizeError(err, fsInfo.path, p) : null);\n      });\n    }\n  }\n}\n\n/**\n * Tricky: Define all of the functions that merely forward arguments to the\n * relevant file system, or return/throw an error.\n * Take advantage of the fact that the *first* argument is always the path, and\n * the *last* is the callback function (if async).\n * @todo Can use numArgs to make proxying more efficient.\n */\nfunction defineFcn(name: string, isSync: boolean, numArgs: number): (...args: any[]) => any {\n  if (isSync) {\n    return function(...args: any[]) {\n      let self: MountableFileSystem = this;\n      var path = args[0];\n      var rv = self._getFs(path);\n      args[0] = rv.path;\n      try {\n        return rv.fs[name].apply(rv.fs, args);\n      } catch (e) {\n        (<any> self).standardizeError(e, rv.path, path);\n        throw e;\n      }\n    };\n  } else {\n    return function(...args: any[]) {\n      let self: MountableFileSystem = this;\n      var path = args[0];\n      var rv = self._getFs(path);\n      args[0] = rv.path;\n      if (typeof args[args.length-1] === 'function') {\n        var cb = args[args.length - 1];\n        args[args.length - 1] = function(...args: any[]) {\n          if (args.length > 0 && args[0] instanceof ApiError) {\n            (<any> self).standardizeError(args[0], rv.path, path);\n          }\n          cb.apply(null, args);\n        }\n      }\n      return rv.fs[name].apply(rv.fs, args);\n    };\n  }\n}\n\nvar fsCmdMap = [\n   // 1 arg functions\n   ['exists', 'unlink', 'readlink'],\n   // 2 arg functions\n   ['stat', 'mkdir', 'realpath', 'truncate'],\n   // 3 arg functions\n   ['open', 'readFile', 'chmod', 'utimes'],\n   // 4 arg functions\n   ['chown'],\n   // 5 arg functions\n   ['writeFile', 'appendFile']];\n\nfor (var i = 0; i < fsCmdMap.length; i++) {\n  var cmds = fsCmdMap[i];\n  for (var j = 0; j < cmds.length; j++) {\n    var fnName = cmds[j];\n    (<any> MountableFileSystem.prototype)[fnName] = defineFcn(fnName, false, i + 1);\n    (<any> MountableFileSystem.prototype)[fnName + 'Sync'] = defineFcn(fnName + 'Sync', true, i + 1);\n  }\n}\n"]}