mirror of
https://github.com/kuhyx/diet-guard.git
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Krzysztof kuhy Rudnicki
802ee0fe6d
Flutter's Linux embedder manages ~20fps at 3840x2160 -- measured on a stock `flutter create` counter app, so it is the toolkit rather than this code -- where the same Dart rendered by Chrome sustains ~144fps (evidence in ~/todo/docs/desktop-performance-findings.md). The desktop target therefore becomes a Flutter *web* build; Android is untouched. `dart:io` does not fail a web *compile* -- it resolves to a stub that throws at runtime -- so every platform edge moves behind a conditional export rather than being discovered later as a blank white window: - storage: `document_store*.dart`, files on Android and IndexedDB in the browser (mirrored to the desktop wrapper, which is what makes a wiped Chrome profile recoverable). Document names stay the exact pre-web filenames so an installed phone keeps reading its existing log. - photos: `blob_store*.dart` plus `attached_image*.dart`, since `Image.file` cannot resolve an IndexedDB key. The picker itself has web support; what changed is the storage and display model. Camera *capture* is genuinely lost on desktop -- and photos never crossed devices anyway, `imagePath` being stripped before push. - scheduling: `background_tasks*.dart`. A browser has no WorkManager equivalent -- a closed tab runs nothing -- so the desktop runs an in-page 5-minute check while its window is open. That loses nothing on the PC, where `diet-guard-gate.timer` already locks the screen on an unlogged slot, which is strictly stronger than a notification. - notifications: `notification_backend*.dart`, the browser Notifications API in place of flutter_local_notifications. - the GitHub token: `token_vault*.dart`. On web it is *not* held by the browser at all -- flutter_secure_storage's web backend is WebCrypto-wrapped localStorage with the wrap key beside the ciphertext, which is obfuscation, not encryption at rest -- so the desktop wrapper owns it and proxies the API (`github_client_factory*.dart`). `Platform.isAndroid` itself throws on web, so every platform branch now tests `kIsWeb` first; the battery-optimization row (permission_handler, no web implementation) is hidden off Android. The desktop pushes under device id `desktop`, not `phone`: sharing an id would have made the two devices overwrite each other's pushed log on every tick. The Python side enumerates device directories generically, so it needs no change. Tests move onto the same seams -- the file-backed stores keep the atomicity and unreadable-file guarantees where they belong. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
65 lines
2.4 KiB
Dart
65 lines
2.4 KiB
Dart
/// File-backed [DocumentStore] used on Android (and any `dart:io` platform).
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library;
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import 'dart:io';
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import 'package:diet_guard_app/services/document_store.dart';
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import 'package:path/path.dart' as p;
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import 'package:path_provider/path_provider.dart';
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/// [DocumentStore] backed by one file per document.
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///
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/// Document names are the full on-disk filenames (`food_log.json`, …) rather
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/// than bare keys, so the files an already-installed phone holds keep their
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/// exact paths through this refactor -- renaming them would look to the app
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/// like a device with no history.
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class FileDocumentStore implements DocumentStore {
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/// Creates a store keeping its documents under [directory].
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FileDocumentStore(this.directory);
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/// Directory holding the document files.
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final Directory directory;
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File _fileFor(String name) => File(p.join(directory.path, name));
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@override
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Future<String?> read(String name) async {
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final file = _fileFor(name);
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if (!file.existsSync()) return null;
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try {
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return await file.readAsString();
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} on FileSystemException {
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// An unreadable file is treated as absent; callers fall back to empty
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// rather than failing to start.
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return null;
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}
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}
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/// Writes to a unique temp file then atomically renames it over the real
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/// one, so a concurrent reader never observes a half-written document.
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///
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/// The temp name carries both the pid and a per-process counter: the pid
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/// separates the foreground app from the connectivity-gated background
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/// push, which can `runSync` -> write from a separate isolate, and the
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/// counter separates two overlapping writes *within* one process (two
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/// setters awaiting the same document would otherwise both create the same
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/// temp file, and the second rename would fail with the first's file
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/// already gone).
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@override
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Future<void> write(String name, String contents) async {
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final file = _fileFor(name);
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await file.parent.create(recursive: true);
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final tmp = File('${file.path}.$pid.${_writeCounter++}.tmp');
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await tmp.writeAsString(contents);
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await tmp.rename(file.path);
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}
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static int _writeCounter = 0;
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}
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/// Opens the platform document store (the app's documents directory).
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// coverage:ignore-start
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Future<DocumentStore> openDocumentStore() async =>
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FileDocumentStore(await getApplicationDocumentsDirectory());
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// coverage:ignore-end
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