| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| import * as Common from '../common/common.js'; // eslint-disable-line no-unused-vars |
| |
| import * as SDK from '../sdk/sdk.js'; // eslint-disable-line no-unused-vars |
| |
| import {ChunkedFileReader, ChunkedReader} from './FileUtils.js'; // eslint-disable-line no-unused-vars |
| |
| export class TempFile { |
| constructor() { |
| /** @type {?Blob} */ |
| this._lastBlob = null; |
| } |
| |
| /** |
| * @param {!Array<string|!Blob>} pieces |
| */ |
| write(pieces) { |
| if (this._lastBlob) { |
| pieces.unshift(this._lastBlob); |
| } |
| this._lastBlob = new Blob(pieces, {type: 'text/plain'}); |
| } |
| |
| /** |
| * @return {!Promise<?string>} |
| */ |
| read() { |
| return this.readRange(); |
| } |
| |
| /** |
| * @return {number} |
| */ |
| size() { |
| return this._lastBlob ? this._lastBlob.size : 0; |
| } |
| |
| /** |
| * @param {number=} startOffset |
| * @param {number=} endOffset |
| * @return {!Promise<?string>} |
| */ |
| async readRange(startOffset, endOffset) { |
| if (!this._lastBlob) { |
| Common.Console.Console.instance().error('Attempt to read a temp file that was never written'); |
| return ''; |
| } |
| const blob = typeof startOffset === 'number' || typeof endOffset === 'number' ? |
| this._lastBlob.slice(/** @type {number} */ (startOffset), /** @type {number} */ (endOffset)) : |
| this._lastBlob; |
| |
| const reader = new FileReader(); |
| try { |
| await new Promise((resolve, reject) => { |
| reader.onloadend = resolve; |
| reader.onerror = reject; |
| reader.readAsText(blob); |
| }); |
| } catch (error) { |
| Common.Console.Console.instance().error('Failed to read from temp file: ' + error.message); |
| } |
| |
| return /** @type {?string} */ (reader.result); |
| } |
| |
| /** |
| * @param {!Common.StringOutputStream.OutputStream} outputStream |
| * @param {function(!ChunkedReader)=} progress |
| * @return {!Promise<?DOMError>} |
| */ |
| async copyToOutputStream(outputStream, progress) { |
| if (!this._lastBlob) { |
| outputStream.close(); |
| return /** @type {?DOMError} */ (null); |
| } |
| const reader = new ChunkedFileReader(/** @type {!File} */ (this._lastBlob), 10 * 1000 * 1000, progress); |
| return reader.read(outputStream).then(success => success ? null : reader.error()); |
| } |
| |
| remove() { |
| this._lastBlob = null; |
| } |
| } |
| |
| /** |
| * @implements {SDK.TracingModel.BackingStorage} |
| */ |
| export class TempFileBackingStorage { |
| constructor() { |
| /** @type {?TempFile} */ |
| this._file = null; |
| /** @type {!Array<string>} */ |
| this._strings; |
| /** @type {number} */ |
| this._stringsLength; |
| this.reset(); |
| } |
| |
| /** |
| * @override |
| * @param {string} string |
| */ |
| appendString(string) { |
| this._strings.push(string); |
| this._stringsLength += string.length; |
| const flushStringLength = 10 * 1024 * 1024; |
| if (this._stringsLength > flushStringLength) { |
| this._flush(); |
| } |
| } |
| |
| /** |
| * @override |
| * @param {string} string |
| * @return {function():!Promise<?string>} |
| */ |
| appendAccessibleString(string) { |
| this._flush(); |
| if (!this._file) { |
| return async () => null; |
| } |
| const startOffset = this._file.size(); |
| this._strings.push(string); |
| this._flush(); |
| return this._file.readRange.bind(this._file, startOffset, this._file.size()); |
| } |
| |
| _flush() { |
| if (!this._strings.length) { |
| return; |
| } |
| if (!this._file) { |
| this._file = new TempFile(); |
| } |
| this._stringsLength = 0; |
| this._file.write(this._strings.splice(0)); |
| } |
| |
| /** |
| * @override |
| */ |
| finishWriting() { |
| this._flush(); |
| } |
| |
| /** |
| * @override |
| */ |
| reset() { |
| if (this._file) { |
| this._file.remove(); |
| } |
| this._file = null; |
| /** @type {!Array<string>} */ |
| this._strings = []; |
| this._stringsLength = 0; |
| } |
| |
| /** |
| * @param {!Common.StringOutputStream.OutputStream} outputStream |
| * @return {!Promise<?DOMError>} |
| */ |
| writeToStream(outputStream) { |
| return this._file ? this._file.copyToOutputStream(outputStream) : Promise.resolve(null); |
| } |
| } |