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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| /** | ||
| * MTKruto Server | ||
| * Copyright (C) 2024 Roj <https://roj.im/> | ||
| * | ||
| * This file is part of MTKruto Server. | ||
| * | ||
| * This program is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| import * as path from "std/path/mod.ts"; | ||
| import { exists, existsSync } from "std/fs/mod.ts"; | ||
|
|
||
| import { Client } from "mtkruto/mod.ts"; | ||
| import { Queue } from "mtkruto/1_utilities.ts"; | ||
|
|
||
| export class DownloadManager { | ||
| #client: Client; | ||
| static DOWNLOADS_PATH = path.join(Deno.cwd(), ".downloads"); | ||
|
|
||
| constructor(client: Client) { | ||
| this.#client = client; | ||
| if (!existsSync(DownloadManager.DOWNLOADS_PATH)) { | ||
| Deno.mkdirSync(DownloadManager.DOWNLOADS_PATH); | ||
| } | ||
| } | ||
|
|
||
| async *download(fileId: string) { | ||
| const dir = path.join(DownloadManager.DOWNLOADS_PATH, fileId); | ||
| if (!await exists(dir)) { | ||
| await Deno.mkdir(dir); | ||
| } | ||
| let n = 0; | ||
| let offset = 0; | ||
| const haveAllParts = await exists(path.join(dir, "_all")); | ||
| let partsAvailable = 0; | ||
| for await (const entry of Deno.readDir(dir)) { | ||
| if (entry.name.startsWith("_") || !entry.isFile) { | ||
| continue; | ||
| } | ||
| if (entry.name == partsAvailable + "") { | ||
| ++partsAvailable; | ||
| const { size } = await Deno.stat(path.join(dir, entry.name)); | ||
| offset += size; | ||
| } | ||
| } | ||
| let download: Download | undefined; | ||
| if (!haveAllParts) { | ||
| download = this.#startDownload(fileId, partsAvailable, offset); | ||
| } | ||
| for (let i = 0; i < partsAvailable; ++i) { | ||
| const part = await Deno.readFile(path.join(dir, i + "")); | ||
| offset += part.byteLength; | ||
| ++n; | ||
| yield part; | ||
| } | ||
| if (download) { | ||
| while (true) { | ||
| if (download.partsAvailable > n) { | ||
| if (await exists(path.join(dir, n + ""))) { | ||
| const part = await Deno.readFile(path.join(dir, n + "")); | ||
| ++n; | ||
| yield part; | ||
| } | ||
| } else if (download.haveAllParts) { | ||
| break; | ||
| } | ||
| await new Promise<void>((r) => { | ||
| const controller = new AbortController(); | ||
| const timeout = setTimeout(() => controller.abort(), 5000); | ||
| download.addEventListener("partAvailable", () => { | ||
| clearTimeout(timeout); | ||
| r(); | ||
| }, { once: true, signal: controller.signal }); | ||
| }); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| #downloadQueue = new Queue("downloads"); | ||
| #downloads = new Map<string, Download>(); | ||
| #startDownload(fileId: string, partsAvailable: number, offset: number) { | ||
| let download = this.#downloads.get(fileId); | ||
| if (!download) { | ||
| download = new Download(this.#client, fileId, partsAvailable, offset); | ||
| this.#downloads.set(fileId, download); | ||
| this.#downloadQueue.add(() => | ||
| download!.start().finally(() => this.#downloads.delete(fileId)) | ||
| ); | ||
| } | ||
| return download; | ||
| } | ||
| } | ||
|
|
||
| class Download extends EventTarget { | ||
| haveAllParts = false; | ||
|
|
||
| constructor( | ||
| private client: Client, | ||
| private fileId: string, | ||
| public partsAvailable: number, | ||
| private offset: number, | ||
| ) { | ||
| super(); | ||
| } | ||
|
|
||
| async start() { | ||
| const dir = path.join(DownloadManager.DOWNLOADS_PATH, this.fileId); | ||
| if (!await exists(dir)) { | ||
| await Deno.mkdir(dir); | ||
| } | ||
| for await ( | ||
| const chunk of this.client.download(this.fileId, { offset: this.offset }) | ||
| ) { | ||
| await Deno.writeFile(path.join(dir, "" + this.partsAvailable), chunk); | ||
| ++this.partsAvailable; | ||
| this.dispatchEvent(new Event("partAvailable")); | ||
| } | ||
| await Deno.writeFile(path.join(dir, "_all"), new Uint8Array()); | ||
| } | ||
| } |
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