mirror of
https://github.com/streetwriters/notesnook.git
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123 lines
3.7 KiB
TypeScript
123 lines
3.7 KiB
TypeScript
/*
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This file is part of the Notesnook project (https://notesnook.com/)
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Copyright (C) 2023 Streetwriters (Private) Limited
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import FileStreamSource from "./filestreamsource.js";
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import { IFileStorage } from "./interfaces.js";
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import { File } from "./types.js";
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import { chunkPrefix } from "./utils.js";
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export default class FileHandle {
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constructor(
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private readonly storage: IFileStorage,
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readonly file: File,
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readonly chunks: string[]
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) {}
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get readable() {
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return new ReadableStream(
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new FileStreamSource(this.storage, this.file, this.chunks)
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);
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}
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get writeable() {
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return new WritableStream<Uint8Array>({
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write: async (chunk, controller) => {
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if (controller.signal.aborted) return;
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const lastOffset = this.lastOffset();
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await this.storage.writeChunk(this.getChunkKey(lastOffset + 1), chunk);
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this.chunks.push(this.getChunkKey(lastOffset + 1));
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},
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abort: async () => {
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for (const chunk of this.chunks) {
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await this.storage.deleteChunk(chunk);
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}
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}
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});
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}
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async writeChunkAtOffset(offset: number, chunk: Uint8Array) {
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await this.storage.writeChunk(this.getChunkKey(offset), chunk);
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}
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async addAdditionalData<T>(key: string, value: T) {
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this.file.additionalData = this.file.additionalData || {};
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this.file.additionalData[key] = value;
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await this.storage.setMetadata(this.file.filename, this.file);
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}
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async delete() {
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for (const chunk of this.chunks) {
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await this.storage.deleteChunk(chunk);
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}
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await this.storage.deleteMetadata(this.file.filename);
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}
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private getChunkKey(offset: number): string {
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return `${chunkPrefix(this.file.filename)}${offset}`;
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}
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async readChunk(offset: number): Promise<Uint8Array | null> {
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const array = await this.storage.readChunk(this.getChunkKey(offset));
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return array || null;
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}
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async readChunks(from: number, length: number): Promise<Blob> {
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const blobParts: BlobPart[] = [];
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for (let i = from; i < from + length; ++i) {
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const array = await this.readChunk(i);
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if (!array) throw new Error(`No data found for chunk at offset ${i}.`);
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blobParts.push(array.buffer);
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}
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return new Blob(blobParts, { type: this.file.type });
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}
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async toBlob() {
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const blobParts: BlobPart[] = [];
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for (const chunk of this.chunks) {
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const array = await this.storage.readChunk(chunk);
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if (!array) continue;
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blobParts.push(array.buffer);
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}
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return new Blob(blobParts, { type: this.file.type });
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}
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async size() {
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let size = 0;
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for (const chunk of this.chunks) {
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const length = await this.storage.chunkSize(chunk);
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if (!length) throw new Error(`Found 0 byte sized chunk.`);
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size += length;
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}
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return size;
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}
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async listChunks() {
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return (
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await this.storage.listChunks(chunkPrefix(this.file.filename))
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).sort((a, b) => a.localeCompare(b, undefined, { numeric: true }));
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}
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private lastOffset() {
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const lastChunk = this.chunks.at(-1);
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if (!lastChunk) return -1;
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return parseInt(lastChunk.replace(chunkPrefix(this.file.filename), ""));
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}
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}
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