pico-pixel-player

pico-pixel-player/webclient/src/offline.ts
offline.ts
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1import type {
2 MediaFile,
3 Directory,
4 FileListing,
5 FileListingWithStatus,
6 DirectoryWithStatus,
7 Metadata,
8} from "music-server-shared/types";
9import { parseMap } from "music-server-shared/mapconversion";
10import type { AppOptions, Playlist } from "./types";
11import { joinPath, toast, unproxy } from "./utils";
12import { batch, from, untrack, type ResourceActions } from "solid-js";
13import { AsyncSemaphore } from "./semaphore";
14import { encodePath } from "music-server-shared/utils";
15import type { FlatFileListing } from "./App";
16import { createStore } from "solid-js/store";
17import Dexie, { liveQuery } from "dexie";
18
19interface StoredFile {
20 path: string;
21 data: Blob;
22 metadata: Metadata;
23}
24
25interface StoredCover {
26 path: string;
27 data: Blob | null;
28}
29
30interface Database extends Dexie {
31 files: Dexie.Table<StoredFile, string>;
32 covers: Dexie.Table<StoredCover, string>;
33 playlists: Dexie.Table<Playlist, string>;
34}
35
36const db = new Dexie("music-files") as Database;
37db.version(1).stores({
38 files: "path",
39 covers: "path",
40 playlists: "name",
41});
42
43export type Progress =
44 | { status: number; abort: () => void }
45 | { status: "Aborted"; retry: () => void }
46 | { status: "Failed"; retry: () => void; reason: string };
47
48interface LoadingChildren {
49 amount: number;
50}
51
52export type DownloadStatus = Progress | LoadingChildren | "Synced" | undefined;
53export const [downloadStatusMap, setDownloadStatusMap] = createStore<Record<string, DownloadStatus>>({});
54
55//creates entry if it doesn't exist, so reactivity works
56export function getDownloadStatus(path: string): DownloadStatus {
57 untrack(() => {
58 if (!Object.keys(downloadStatusMap).includes(path)) setDownloadStatusMap(path, undefined);
59 });
60 return downloadStatusMap[path];
61}
62
63function updateRecursiveStatus(path: string, loadChange: number, includeCurrent: boolean) {
64 function updateProgressAmount(path: string) {
65 const currentStatus = downloadStatusMap[path];
66 if (typeof currentStatus !== "object" || !("amount" in currentStatus)) {
67 setDownloadStatusMap(path, loadChange > 0 ? { amount: loadChange } : undefined);
68 return;
69 }
70
71 const newAmount = currentStatus.amount + loadChange;
72 setDownloadStatusMap(path, newAmount > 0 ? { amount: newAmount } : undefined);
73 }
74
75 if (includeCurrent) updateProgressAmount(path);
76 // Update all parent directories
77 let currentPath = path;
78 while (true) {
79 const lastSlash = currentPath.lastIndexOf("/");
80 if (lastSlash === -1) break;
81 currentPath = currentPath.substring(0, lastSlash);
82 updateProgressAmount(currentPath);
83 }
84}
85
86function startProgress(path: string, status: DownloadStatus) {
87 updateRecursiveStatus(path, 1, false);
88 setDownloadStatusMap(path, status);
89}
90
91function stopProgress(path: string, status: DownloadStatus) {
92 updateRecursiveStatus(path, -1, false);
93 setDownloadStatusMap(path, status);
94}
95
96//initialize filetrees and download statuses from indexedDB
97export async function loadDataFromDB() {
98 try {
99 const files = await db.files.toArray();
100 for (const file of files) {
101 setDownloadStatusMap(file.path, "Synced");
102 updateFileTree(file.path, { metadata: file.metadata }, true);
103 }
104 const covers = await db.covers.toArray();
105 for (const cover of covers) {
106 coverCache.set(cover.path, { data: cover.data });
107 }
108 } catch (e) {
109 toast("Loading offline files failed", "error", e);
110 console.error(e);
111 }
112}
113
114//contains all locally synced files
115const offlineTreeRoot: Directory = {
116 files: new Map(),
117};
118//used for caching online file listings
119const onlineTreeRoot: DirectoryWithStatus = {
120 files: new Map(),
121 status: "Unknown",
122};
123
124//merges "Scanned" directories from "other" to "target"
125function mergeTrees(target: DirectoryWithStatus, other: DirectoryWithStatus) {
126 if (other.status === "Unknown") return;
127 target.status = other.status;
128 for (const [fileName, file] of other.files.entries()) {
129 const targetFile = target.files.get(fileName);
130 if (targetFile && "files" in targetFile && "files" in file) {
131 mergeTrees(targetFile, file);
132 } else {
133 target.files.set(fileName, file);
134 }
135 }
136}
137
138//TODO: improve typing to avoid "as"
139//overloads for typecheking
140//offline tree only stores files, directories are created ad-hoc
141function updateFileTree(path: string, file: MediaFile, offline: true): void;
142//online tree only stores cached directory listings
143function updateFileTree(path: string, file: DirectoryWithStatus, offline: false): void;
144// Updates file tree structure with new data (offline or online)
145function updateFileTree(path: string, file: DirectoryWithStatus | MediaFile, offline: boolean) {
146 if (offline && path === "") throw new Error("Trying to update root in offline mode");
147 const basePath = path.split("/").slice(0, -1).join("/");
148 const fileName = path.split("/").toReversed()[0];
149 const node = getDirInTree(basePath, true, offline);
150
151 if (offline) {
152 node.files.set(fileName, file);
153 } else {
154 if (path === "") mergeTrees(node as DirectoryWithStatus, file as DirectoryWithStatus);
155 else {
156 let target = node.files.get(fileName) as DirectoryWithStatus;
157 if (!target) target = { files: new Map(), status: "Unknown" };
158 mergeTrees(target as DirectoryWithStatus, file as DirectoryWithStatus);
159 node.files.set(fileName, target);
160 }
161 }
162}
163
164//overloads for typechecking
165function getDirInTree(path: string, create: true, offline: true): Directory;
166function getDirInTree(path: string, create: true, offline: false): DirectoryWithStatus;
167function getDirInTree(path: string, create: false, offline: true): Directory | null;
168function getDirInTree(path: string, create: false, offline: false): DirectoryWithStatus | null;
169function getDirInTree(path: string, create: true, offline: boolean): DirectoryWithStatus | Directory;
170function getDirInTree(path: string, create: false, offline: boolean): DirectoryWithStatus | Directory | null;
171// get a DirectoryNode from the directory tree matching the path, and optionally creating missing nodes it if they don't exist yet
172function getDirInTree(path: string, create: boolean, offline: boolean): DirectoryWithStatus | Directory | null {
173 let current = offline ? offlineTreeRoot : onlineTreeRoot;
174 if (path === "") return current;
175 const parts = path.split("/");
176
177 for (const part of parts) {
178 let next: DirectoryWithStatus | Directory | MediaFile | undefined = current.files.get(part);
179 if (!next || "metadata" in next) {
180 if (!create) return null;
181 //if mediafile already exists, we overwrite it with a directory anyway
182 if (offline) next = { files: new Map() };
183 else next = { files: new Map(), status: "Unknown" };
184 current.files.set(part, next);
185 }
186 current = next;
187 }
188 return current;
189}
190
191function deleteInOfflineTree(path: string): void {
192 if (path === "") return;
193 const basePath = path.split("/").slice(0, -1).join("/");
194 const fileName = path.split("/").toReversed()[0];
195
196 const node = getDirInTree(basePath, false, true);
197 if (!node) return;
198
199 node.files.delete(fileName);
200 if (node.files.size === 0) {
201 db.covers.delete(basePath); //remove stored cover for this dir if there are not files left
202 deleteInOfflineTree(basePath);
203 }
204}
205
206export const clearDirectoryCache = async (path: string) => {
207 const node = getDirInTree(path, false, false);
208 if (!node) return;
209
210 // Save existing children before clearing
211 const preservedChildren = new Map(node.files);
212
213 node.files.clear();
214 node.status = "Unknown";
215
216 // restore any preserved subtrees where the parent directory still exist
217 const newListing = await listFiles(path, false, false);
218 for (const [name, child] of preservedChildren.entries()) {
219 if ("files" in child && newListing.has(name)) {
220 node.files.set(name, child);
221 }
222 }
223};
224async function listOnlineFiles(dir: string, recursive: boolean): Promise<FileListingWithStatus | undefined> {
225 const response = await fetch(`/list/${encodePath(dir)}?recursive=${recursive}`, { credentials: "same-origin" }).catch(
226 () => {},
227 );
228 if (response?.status === 404) {
229 toast(`Directory not found: ${dir}`, "error");
230 return;
231 }
232 if (!response || !response.ok) {
233 toast(
234 `Fetching files for ${dir === "" ? "root" : dir} failed${response ? `: ${response.statusText}` : ""}`,
235 "error",
236 );
237 return;
238 }
239
240 return parseMap(await response.text()) as FileListingWithStatus;
241}
242
243function listOfflineFiles(dir: string): FileListing {
244 const node = getDirInTree(dir, false, true);
245 if (!node || !node.files) return new Map();
246 return node.files;
247}
248
249//checks if this Directory is completely scanned, i.e. suitable for a recursive listing result
250function fullyKnown(dir: DirectoryWithStatus) {
251 if (dir.status === "Unknown") {
252 return false;
253 }
254 if (dir.files.values().some((value) => "files" in value && !fullyKnown(value))) {
255 return false;
256 }
257 return true;
258}
259
260//non-recursive listing should not include nested children
261function pruneChildren(listing: FileListing) {
262 const pruned = new Map();
263 for (const [name, item] of listing.entries()) {
264 if ("metadata" in item) pruned.set(name, item);
265 else pruned.set(name, { files: new Map() });
266 }
267 return pruned;
268}
269
270//used for combining the online and offline results, to be able to show files that only exist locally
271function combineFileListings(listing1: FileListing, listing2: FileListing): FileListing {
272 const result = new Map(listing1);
273
274 for (const [key, value2] of listing2.entries()) {
275 const value1 = result.get(key);
276
277 if (value1 && "files" in value1 && "files" in value2) {
278 result.set(key, { files: combineFileListings(value1.files, value2.files) });
279 } else {
280 result.set(key, value2);
281 }
282 }
283
284 return result;
285}
286
287// File listing logic with hybrid online/offline support
288// Combines:
289// 1. Direct IndexedDB lookups for offline mode
290// 2. Cached online listings
291// 3. Merged online+offline results
292export async function listFiles(dir: string, offline: boolean, recursive: boolean): Promise<FileListing> {
293 if (offline) {
294 const files = listOfflineFiles(dir);
295 return recursive ? files : pruneChildren(files);
296 }
297 const cached = getDirInTree(dir, false, false);
298 if (cached !== null && cached.status === "Scanned" && (!recursive || fullyKnown(cached))) {
299 const combined = combineFileListings(cached.files, listOfflineFiles(dir));
300 return recursive ? combined : pruneChildren(combined);
301 }
302 const files = await listOnlineFiles(dir, recursive);
303 if (!files) return new Map();
304 updateFileTree(dir, { files, status: "Scanned" }, false);
305 const combined = combineFileListings(files, listOfflineFiles(dir));
306 return recursive ? combined : pruneChildren(combined);
307}
308
309const coverCache = new Map<string, { data: Blob | null }>();
310
311//get cover art object-url for a file or directory with cache-first strategy
312export async function getCover(
313 dir: string,
314 options: AppOptions,
315 saveToDb: boolean,
316 offline: boolean,
317 forceRefresh = false,
318) {
319 try {
320 const cached = coverCache.get(dir);
321 if (!forceRefresh && cached !== undefined) {
322 if (saveToDb) db.covers.add({ path: dir, data: cached.data }).catch(() => {});
323 return cached.data === null ? undefined : URL.createObjectURL(cached.data);
324 }
325
326 if (offline) return undefined;
327
328 const response = await fetch(`/cover/${encodePath(dir)}${options.transcodeCovers ? "?transcode=true" : ""}`, {
329 method: "GET",
330 credentials: "same-origin",
331 }).catch(() => {});
332 if (!response || response.status === 404) {
333 coverCache.set(dir, { data: null });
334 if (saveToDb) db.covers.add({ path: dir, data: null }).catch(() => {});
335 //if cover already exists in database, update it
336 else if (forceRefresh && db.covers.get(dir) !== undefined) db.covers.put({ path: dir, data: null });
337 return undefined;
338 }
339 const blob = await response.blob();
340 coverCache.set(dir, { data: blob });
341 if (saveToDb) db.covers.add({ path: dir, data: blob }).catch(() => {});
342 //if cover already exists in database, update it
343 else if (forceRefresh && db.covers.get(dir) !== undefined) db.covers.put({ path: dir, data: blob });
344 return URL.createObjectURL(blob);
345 } catch {
346 return undefined;
347 }
348}
349
350//returns an object url to the blob if synced, otherwise the server url
351export async function getSrc(path: string, options: AppOptions, offline: boolean, forceUrl?: true): Promise<string>;
352export async function getSrc(path: string, options: AppOptions, offline: boolean, forceUrl?: boolean) {
353 if (!forceUrl) {
354 const dbResult = await db.files.get(path);
355 if (dbResult) return URL.createObjectURL(dbResult.data);
356
357 if (offline) {
358 toast("This file is not cached, leave offline mode to play it", "error");
359 return undefined;
360 }
361 }
362 if (options.enableTranscoding) {
363 return `${joinPath("/transcode", encodePath(path))}?bitrate=${options.bitrate}&format=${options.format}&disableChunkedTranscoding=${options.disableChunkedTranscoding}`;
364 }
365 return joinPath("/download", encodePath(path));
366}
367
368export async function loadPlaylists() {
369 return await db.playlists.toArray();
370}
371
372//save playlist to indexedDB, throws error if playlist with that name already exists and overwrite=false
373export async function savePlaylist(playlist: Playlist, overwrite: boolean) {
374 playlist.items = playlist.items.map((item) => {
375 //some less space in the db by omitting ids
376 return { path: item.path, metadata: unproxy(item.metadata) };
377 });
378
379 if (overwrite) {
380 await db.playlists.put(playlist);
381 } else {
382 await db.playlists.add(playlist);
383 }
384}
385
386export async function deletePlaylist(name: string) {
387 await db.playlists.delete(name);
388}
389
390function collectMediaFilePaths(listing: FileListing, basePath: string): string[] {
391 const paths: string[] = [];
392
393 for (const [name, item] of listing.entries()) {
394 const currentPath = joinPath(basePath, name);
395
396 if ("metadata" in item) {
397 paths.push(currentPath);
398 } else if ("files" in item) {
399 paths.push(...collectMediaFilePaths(item.files, currentPath));
400 }
401 }
402
403 return paths;
404}
405
406//deletes file or directory(+recursive contents) from indexedDB and updates their download statuses
407export async function deleteFile(
408 fullPath: string,
409 item: MediaFile | Directory,
410 fetchFiles: ResourceActions<FlatFileListing>,
411) {
412 try {
413 if ("metadata" in item && downloadStatusMap[fullPath] !== "Synced") return;
414 startProgress(fullPath, { amount: 1 });
415
416 let toDelete: string[];
417 if ("files" in item) {
418 toDelete = collectMediaFilePaths(listOfflineFiles(fullPath), fullPath);
419 } else {
420 toDelete = [fullPath];
421 }
422
423 await db.files.bulkDelete(toDelete); //delete file from database
424 await db.covers.bulkDelete(toDelete); //delete embedded cover from database
425 deleteInOfflineTree(fullPath); //delete node from tree
426 batch(() => {
427 for (const path of toDelete) {
428 setDownloadStatusMap(path, undefined); // set all children to unsynced
429 }
430 });
431 fetchFiles.refetch();
432 } finally {
433 stopProgress(fullPath, undefined);
434 }
435}
436
437const downloadSemaphore = new AsyncSemaphore(1);
438
439//Download file to indexedDB and updates the offline file tree
440//concurrency control via the downloadSemaphore
441async function downloadFile(
442 path: string,
443 options: AppOptions,
444 item: MediaFile,
445 fetchFiles: ResourceActions<FlatFileListing>,
446 redownload: boolean,
447): Promise<void> {
448 const retry = () => downloadFile(path, options, item, fetchFiles, redownload);
449
450 const controller = new AbortController();
451 let abortResolve!: () => void;
452 const abortPromise = new Promise<void>((outerResolve) => {
453 abortResolve = () => {
454 controller.abort();
455 stopProgress(
456 path,
457 // if it was already synced, restore it
458 initialProgress === "Synced" ? "Synced" : { status: "Aborted", retry },
459 );
460 outerResolve();
461 };
462 });
463 // file already downloaded or download already in progress
464 const initialProgress = downloadStatusMap[path];
465 if (
466 (!redownload && initialProgress === "Synced") ||
467 (typeof initialProgress === "object" && "bytes" in initialProgress)
468 )
469 return;
470 startProgress(path, { status: 0, abort: abortResolve });
471
472 try {
473 //options might change at any point, update the semaphore to the current value
474 downloadSemaphore.setMaxConcurrency(options.enableTranscoding ? options.maxTranscodes : options.maxDownloads);
475
476 //make sure to only allow the set amount of parallel downloads
477 const semaphorePromise = downloadSemaphore.acquire();
478 await Promise.race([abortPromise, semaphorePromise]);
479 try {
480 const res = await fetch(await getSrc(path, options, false, true), {
481 signal: controller.signal,
482 credentials: "same-origin",
483 });
484
485 //let the browser do the actual download
486 const blobPromise = res.clone().blob();
487 if (!res.ok || !res.body) throw res.statusText;
488 //we just iterate over the chunks to get the current progress
489 const reader = res.body.getReader();
490 let received = 0;
491
492 let lastUpdate = 0;
493 while (true) {
494 const { done, value } = await reader.read();
495 if (done) break;
496 received += value.length;
497
498 //debouncing logic to not update UI too fast
499 const now = Date.now();
500 if (now - lastUpdate < 250) continue;
501 lastUpdate = now;
502 setDownloadStatusMap(path, { status: received, abort: abortResolve });
503 }
504 const blob = await blobPromise;
505
506 await db.files.put({
507 path,
508 data: blob,
509 metadata: unproxy(item.metadata),
510 });
511
512 updateFileTree(path, item, true);
513 stopProgress(path, "Synced");
514 fetchFiles.refetch();
515
516 //iterate through all parent directories and download their covers to database
517 const parts = path.split("/");
518 while (true) {
519 getCover(parts.join("/"), options, true, false).then((cover) => URL.revokeObjectURL(cover || ""));
520 parts.pop();
521 if (parts.length === 0) break;
522 }
523 } finally {
524 downloadSemaphore.release();
525 }
526 } catch (e) {
527 if (e && typeof e === "object" && "name" in e && e.name === "AbortError") return;
528 stopProgress(
529 path,
530 // if it was already synced, restore it
531 initialProgress === "Synced"
532 ? "Synced"
533 : {
534 status: "Failed",
535 reason: e ? e.toString() : "Unknown error",
536 retry,
537 },
538 );
539 }
540}
541
542export async function download(
543 fullPath: string,
544 item: MediaFile | Directory,
545 options: AppOptions,
546 fetchFiles: ResourceActions<FlatFileListing>,
547 redownload = false,
548) {
549 if ("metadata" in item) {
550 await downloadFile(fullPath, options, item, fetchFiles, redownload || false);
551 } else {
552 updateRecursiveStatus(fullPath, 1, true);
553 try {
554 //start downloads for all children to allow them to run in parallel, then wait for the results
555 const promises: Promise<unknown>[] = [];
556 const listing = await listFiles(fullPath, false, false);
557 batch(() => {
558 for (const [childName, childItem] of listing) {
559 promises.push(download(joinPath(fullPath, childName), childItem, options, fetchFiles, redownload));
560 }
561 });
562 await Promise.allSettled(promises);
563 } finally {
564 updateRecursiveStatus(fullPath, -1, true);
565 }
566 }
567}
568
569export const storedFilesLive = from(
570 liveQuery(async () => await db.files.toCollection().keys()),
571 [],
572);
573