browserfs
Version:
A filesystem in your browser!
191 lines • 23.9 kB
JavaScript
;
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 kvfs = require('../generic/key_value_filesystem');
var api_error_1 = require('../core/api_error');
var global = require('../core/global');
var util_1 = require('../core/util');
var indexedDB = global.indexedDB ||
global.mozIndexedDB ||
global.webkitIndexedDB ||
global.msIndexedDB;
function convertError(e, message) {
if (message === void 0) { message = e.toString(); }
switch (e.name) {
case "NotFoundError":
return new api_error_1.ApiError(api_error_1.ErrorCode.ENOENT, message);
case "QuotaExceededError":
return new api_error_1.ApiError(api_error_1.ErrorCode.ENOSPC, message);
default:
return new api_error_1.ApiError(api_error_1.ErrorCode.EIO, message);
}
}
function onErrorHandler(cb, code, message) {
if (code === void 0) { code = api_error_1.ErrorCode.EIO; }
if (message === void 0) { message = null; }
return function (e) {
e.preventDefault();
cb(new api_error_1.ApiError(code, message));
};
}
var IndexedDBROTransaction = (function () {
function IndexedDBROTransaction(tx, store) {
this.tx = tx;
this.store = store;
}
IndexedDBROTransaction.prototype.get = function (key, cb) {
try {
var r = this.store.get(key);
r.onerror = onErrorHandler(cb);
r.onsuccess = function (event) {
var result = event.target.result;
if (result === undefined) {
cb(null, result);
}
else {
cb(null, util_1.arrayBuffer2Buffer(result));
}
};
}
catch (e) {
cb(convertError(e));
}
};
return IndexedDBROTransaction;
}());
exports.IndexedDBROTransaction = IndexedDBROTransaction;
var IndexedDBRWTransaction = (function (_super) {
__extends(IndexedDBRWTransaction, _super);
function IndexedDBRWTransaction(tx, store) {
_super.call(this, tx, store);
}
IndexedDBRWTransaction.prototype.put = function (key, data, overwrite, cb) {
try {
var arraybuffer = util_1.buffer2ArrayBuffer(data), r;
if (overwrite) {
r = this.store.put(arraybuffer, key);
}
else {
r = this.store.add(arraybuffer, key);
}
r.onerror = onErrorHandler(cb);
r.onsuccess = function (event) {
cb(null, true);
};
}
catch (e) {
cb(convertError(e));
}
};
IndexedDBRWTransaction.prototype.del = function (key, cb) {
try {
var r = this.store['delete'](key);
r.onerror = onErrorHandler(cb);
r.onsuccess = function (event) {
cb();
};
}
catch (e) {
cb(convertError(e));
}
};
IndexedDBRWTransaction.prototype.commit = function (cb) {
setTimeout(cb, 0);
};
IndexedDBRWTransaction.prototype.abort = function (cb) {
var _e;
try {
this.tx.abort();
}
catch (e) {
_e = convertError(e);
}
finally {
cb(_e);
}
};
return IndexedDBRWTransaction;
}(IndexedDBROTransaction));
exports.IndexedDBRWTransaction = IndexedDBRWTransaction;
var IndexedDBStore = (function () {
function IndexedDBStore(cb, storeName) {
var _this = this;
if (storeName === void 0) { storeName = 'browserfs'; }
this.storeName = storeName;
var openReq = indexedDB.open(this.storeName, 1);
openReq.onupgradeneeded = function (event) {
var db = event.target.result;
if (db.objectStoreNames.contains(_this.storeName)) {
db.deleteObjectStore(_this.storeName);
}
db.createObjectStore(_this.storeName);
};
openReq.onsuccess = function (event) {
_this.db = event.target.result;
cb(null, _this);
};
openReq.onerror = onErrorHandler(cb, api_error_1.ErrorCode.EACCES);
}
IndexedDBStore.prototype.name = function () {
return "IndexedDB - " + this.storeName;
};
IndexedDBStore.prototype.clear = function (cb) {
try {
var tx = this.db.transaction(this.storeName, 'readwrite'), objectStore = tx.objectStore(this.storeName), r = objectStore.clear();
r.onsuccess = function (event) {
setTimeout(cb, 0);
};
r.onerror = onErrorHandler(cb);
}
catch (e) {
cb(convertError(e));
}
};
IndexedDBStore.prototype.beginTransaction = function (type) {
if (type === void 0) { type = 'readonly'; }
var tx = this.db.transaction(this.storeName, type), objectStore = tx.objectStore(this.storeName);
if (type === 'readwrite') {
return new IndexedDBRWTransaction(tx, objectStore);
}
else if (type === 'readonly') {
return new IndexedDBROTransaction(tx, objectStore);
}
else {
throw new api_error_1.ApiError(api_error_1.ErrorCode.EINVAL, 'Invalid transaction type.');
}
};
return IndexedDBStore;
}());
exports.IndexedDBStore = IndexedDBStore;
var IndexedDBFileSystem = (function (_super) {
__extends(IndexedDBFileSystem, _super);
function IndexedDBFileSystem(cb, storeName) {
var _this = this;
_super.call(this);
new IndexedDBStore(function (e, store) {
if (e) {
cb(e);
}
else {
_this.init(store, function (e) {
cb(e, _this);
});
}
}, storeName);
}
IndexedDBFileSystem.isAvailable = function () {
try {
return typeof indexedDB !== 'undefined' && null !== indexedDB.open("__browserfs_test__");
}
catch (e) {
return false;
}
};
return IndexedDBFileSystem;
}(kvfs.AsyncKeyValueFileSystem));
exports.__esModule = true;
exports["default"] = IndexedDBFileSystem;
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kvfs = require('../generic/key_value_filesystem');\nimport {ApiError, ErrorCode} from '../core/api_error';\nimport global = require('../core/global');\nimport {arrayBuffer2Buffer, buffer2ArrayBuffer} from '../core/util';\n/**\n * Get the indexedDB constructor for the current browser.\n */\nvar indexedDB: IDBFactory = global.indexedDB ||\n                          (<any>global).mozIndexedDB ||\n                          (<any>global).webkitIndexedDB ||\n                          global.msIndexedDB;\n\n/**\n * Converts a DOMException or a DOMError from an IndexedDB event into a\n * standardized BrowserFS API error.\n */\nfunction convertError(e: {name: string}, message: string = e.toString()): ApiError {\n  switch(e.name) {\n    case \"NotFoundError\":\n      return new ApiError(ErrorCode.ENOENT, message);\n    case \"QuotaExceededError\":\n      return new ApiError(ErrorCode.ENOSPC, message);\n    default:\n      // The rest do not seem to map cleanly to standard error codes.\n      return new ApiError(ErrorCode.EIO, message);\n  }\n}\n\n/**\n * Produces a new onerror handler for IDB. Our errors are always fatal, so we\n * handle them generically: Call the user-supplied callback with a translated\n * version of the error, and let the error bubble up.\n */\nfunction onErrorHandler(cb: (e: ApiError) => void,\n  code: ErrorCode = ErrorCode.EIO, message: string = null): (e?: any) => void {\n  return function (e?: any): void {\n    // Prevent the error from canceling the transaction.\n    e.preventDefault();\n    cb(new ApiError(code, message));\n  };\n}\n\nexport class IndexedDBROTransaction implements kvfs.AsyncKeyValueROTransaction {\n  constructor(public tx: IDBTransaction, public store: IDBObjectStore) { }\n\n  get(key: string, cb: (e: ApiError, data?: NodeBuffer) => void): void {\n    try {\n      var r: IDBRequest = this.store.get(key);\n      r.onerror = onErrorHandler(cb);\n      r.onsuccess = (event) => {\n        // IDB returns the value 'undefined' when you try to get keys that\n        // don't exist. The caller expects this behavior.\n        var result: any = (<any>event.target).result;\n        if (result === undefined) {\n          cb(null, result);\n        } else {\n          // IDB data is stored as an ArrayBuffer\n          cb(null, arrayBuffer2Buffer(result));\n        }\n      };\n    } catch (e) {\n      cb(convertError(e));\n    }\n  }\n}\n\nexport class IndexedDBRWTransaction extends IndexedDBROTransaction implements kvfs.AsyncKeyValueRWTransaction, kvfs.AsyncKeyValueROTransaction {\n  constructor(tx: IDBTransaction, store: IDBObjectStore) {\n    super(tx, store);\n  }\n\n  public put(key: string, data: NodeBuffer, overwrite: boolean, cb: (e: ApiError, committed?: boolean) => void): void {\n    try {\n      var arraybuffer = buffer2ArrayBuffer(data),\n        r: IDBRequest;\n      if (overwrite) {\n        r = this.store.put(arraybuffer, key);\n      } else {\n        // 'add' will never overwrite an existing key.\n        r = this.store.add(arraybuffer, key);\n      }\n      // XXX: NEED TO RETURN FALSE WHEN ADD HAS A KEY CONFLICT. NO ERROR.\n      r.onerror = onErrorHandler(cb);\n      r.onsuccess = (event) => {\n        cb(null, true);\n      };\n    } catch (e) {\n      cb(convertError(e));\n    }\n  }\n\n  public del(key: string, cb: (e?: ApiError) => void): void {\n    try {\n      // NOTE: IE8 has a bug with identifiers named 'delete' unless used as a string\n      // like this.\n      // http://stackoverflow.com/a/26479152\n      var r: IDBRequest = this.store['delete'](key);\n      r.onerror = onErrorHandler(cb);\n      r.onsuccess = (event) => {\n        cb();\n      };\n    } catch (e) {\n      cb(convertError(e));\n    }\n  }\n\n  public commit(cb: (e?: ApiError) => void): void {\n    // Return to the event loop to commit the transaction.\n    setTimeout(cb, 0);\n  }\n\n  public abort(cb: (e?: ApiError) => void): void {\n    var _e: ApiError;\n    try {\n      this.tx.abort();\n    } catch (e) {\n      _e = convertError(e);\n    } finally {\n      cb(_e);\n    }\n  }\n}\n\nexport class IndexedDBStore implements kvfs.AsyncKeyValueStore {\n  private db: IDBDatabase;\n\n  /**\n   * Constructs an IndexedDB file system.\n   * @param cb Called once the database is instantiated and ready for use.\n   *   Passes an error if there was an issue instantiating the database.\n   * @param objectStoreName The name of this file system. You can have\n   *   multiple IndexedDB file systems operating at once, but each must have\n   *   a different name.\n   */\n  constructor(cb: (e: ApiError, store?: IndexedDBStore) => void, private storeName: string = 'browserfs') {\n    var openReq: IDBOpenDBRequest = indexedDB.open(this.storeName, 1);\n\n    openReq.onupgradeneeded = (event) => {\n      var db: IDBDatabase = (<any>event.target).result;\n      // Huh. This should never happen; we're at version 1. Why does another\n      // database exist?\n      if (db.objectStoreNames.contains(this.storeName)) {\n        db.deleteObjectStore(this.storeName);\n      }\n      db.createObjectStore(this.storeName);\n    };\n\n    openReq.onsuccess = (event) => {\n      this.db = (<any>event.target).result;\n      cb(null, this);\n    };\n\n    openReq.onerror = onErrorHandler(cb, ErrorCode.EACCES);\n  }\n\n  public name(): string {\n    return \"IndexedDB - \" + this.storeName;\n  }\n\n  public clear(cb: (e?: ApiError) => void): void {\n    try {\n      var tx = this.db.transaction(this.storeName, 'readwrite'),\n        objectStore = tx.objectStore(this.storeName),\n        r: IDBRequest = objectStore.clear();\n      r.onsuccess = (event) => {\n        // Use setTimeout to commit transaction.\n        setTimeout(cb, 0);\n      };\n      r.onerror = onErrorHandler(cb);\n    } catch (e) {\n      cb(convertError(e));\n    }\n  }\n\n  public beginTransaction(type: string = 'readonly'): kvfs.AsyncKeyValueROTransaction {\n    var tx = this.db.transaction(this.storeName, type),\n      objectStore = tx.objectStore(this.storeName);\n    if (type === 'readwrite') {\n      return new IndexedDBRWTransaction(tx, objectStore);\n    } else if (type === 'readonly') {\n      return new IndexedDBROTransaction(tx, objectStore);\n    } else {\n      throw new ApiError(ErrorCode.EINVAL, 'Invalid transaction type.');\n    }\n  }\n}\n\n/**\n * A file system that uses the IndexedDB key value file system.\n */\nexport default class IndexedDBFileSystem extends kvfs.AsyncKeyValueFileSystem {\n  constructor(cb: (e: ApiError, fs?: IndexedDBFileSystem) => void, storeName?: string) {\n    super();\n    new IndexedDBStore((e, store?): void => {\n      if (e) {\n        cb(e);\n      } else {\n        this.init(store, (e?) => {\n          cb(e, this);\n        });\n      }\n    }, storeName);\n  }\n\n  public static isAvailable(): boolean {\n    // In Safari's private browsing mode, indexedDB.open returns NULL.\n    // In Firefox, it throws an exception.\n    // In Chrome, it \"just works\", and clears the database when you leave the page.\n    // Untested: Opera, IE.\n    try {\n      return typeof indexedDB !== 'undefined' && null !== indexedDB.open(\"__browserfs_test__\");\n    } catch (e) {\n      return false;\n    }\n  }\n}\n"]}