403 lines
14 KiB
Dart
403 lines
14 KiB
Dart
import 'dart:convert';
|
||
import 'dart:io';
|
||
|
||
import 'package:crypto/crypto.dart' show sha256;
|
||
import 'package:flutter/foundation.dart';
|
||
import 'package:http/http.dart' as http;
|
||
import 'package:path_provider/path_provider.dart';
|
||
|
||
import '../config/app_config.dart';
|
||
|
||
/// 模型目录条目（GET /api/v1/app/update 响应 data.models[]）。
|
||
/// 服务器发布模型后随版本检查一同下发，App 按目录逐数据集下载/更新。
|
||
class ModelCatalogItem {
|
||
final int datasetId;
|
||
final String datasetName;
|
||
final String version;
|
||
final List<String> labels;
|
||
final int sizeBytes;
|
||
final String sha256;
|
||
final String downloadUrl;
|
||
final String coverUrl;
|
||
|
||
const ModelCatalogItem({
|
||
required this.datasetId,
|
||
required this.datasetName,
|
||
required this.version,
|
||
required this.labels,
|
||
required this.sizeBytes,
|
||
required this.sha256,
|
||
required this.downloadUrl,
|
||
this.coverUrl = '',
|
||
});
|
||
|
||
factory ModelCatalogItem.fromJson(Map<String, dynamic> j) =>
|
||
ModelCatalogItem(
|
||
datasetId: (j['datasetId'] as num?)?.toInt() ?? 0,
|
||
datasetName: j['datasetName'] as String? ?? '',
|
||
version: j['version'] as String? ?? '',
|
||
labels: (j['labels'] as List? ?? const [])
|
||
.map((e) => e.toString())
|
||
.toList(),
|
||
sizeBytes: (j['sizeBytes'] as num?)?.toInt() ?? 0,
|
||
sha256: j['sha256'] as String? ?? '',
|
||
downloadUrl: j['downloadUrl'] as String? ?? '',
|
||
coverUrl: j['coverUrl'] as String? ?? '',
|
||
);
|
||
}
|
||
|
||
/// 已就绪模型（字节 + 标签，供推理 worker 加载）
|
||
class ModelBundle {
|
||
final int datasetId;
|
||
final String datasetName;
|
||
final String version;
|
||
final List<String> labels;
|
||
final Uint8List bytes;
|
||
|
||
const ModelBundle({
|
||
required this.datasetId,
|
||
required this.datasetName,
|
||
required this.version,
|
||
required this.labels,
|
||
required this.bytes,
|
||
});
|
||
}
|
||
|
||
/// 模型热更新管理：启动时拉取模型目录（随 /app/update 公开接口下发，无需登录态），
|
||
/// 按需下载/校验/持久化各数据集模型，供相机页多模型并行推理。
|
||
///
|
||
/// 存储：应用私有目录 `models/<datasetId>/`（model.tflite + labels.json + meta.json），
|
||
/// meta 记录 {version, sha256}，服务器发布新版本时按版本+摘要重下，不重复下载旧模型。
|
||
class ModelManager extends ChangeNotifier {
|
||
static final ModelManager instance = ModelManager._();
|
||
|
||
final String baseUrl;
|
||
final http.Client _client;
|
||
final Future<Directory> Function()? _rootDirOverride;
|
||
|
||
List<ModelBundle> _models = const [];
|
||
List<ModelCatalogItem> _catalog = const [];
|
||
final Set<int> _activeIds = {};
|
||
final Set<int> _downloadedIds = {};
|
||
final Map<int, double> _progress = {};
|
||
final Map<int, String> _errors = {};
|
||
bool _activeLoaded = false;
|
||
bool _ready = false;
|
||
bool _refreshing = false;
|
||
String? _error;
|
||
Future<void>? _inFlight;
|
||
|
||
/// 服务器目录（弹层模型清单展示用）
|
||
List<ModelCatalogItem> get catalog => _catalog;
|
||
|
||
/// 激活模型 id 集合（多选叠加）
|
||
Set<int> get activeDatasetIds => Set.unmodifiable(_activeIds);
|
||
|
||
bool isActive(int datasetId) => _activeIds.contains(datasetId);
|
||
|
||
/// 该数据集模型文件是否已下载到本地（同步判断，内存态）
|
||
bool isDownloaded(int datasetId) => _downloadedIds.contains(datasetId);
|
||
|
||
/// 下载进度 0..1（无下载/已完成为 null）
|
||
double? progressOf(int datasetId) => _progress[datasetId];
|
||
|
||
/// 下载失败原因（失败后可重试）
|
||
String? errorOf(int datasetId) => _errors[datasetId];
|
||
|
||
ModelManager._({String? baseUrl, http.Client? client})
|
||
: this(baseUrl: baseUrl, client: client);
|
||
|
||
/// 可注入 baseUrl / client / 存储根目录（单测用）
|
||
@visibleForTesting
|
||
ModelManager({
|
||
String? baseUrl,
|
||
http.Client? client,
|
||
Future<Directory> Function()? rootDir,
|
||
}) : baseUrl = baseUrl ?? AppConfig.apiBaseUrl,
|
||
_client = client ?? http.Client(),
|
||
_rootDirOverride = rootDir;
|
||
|
||
/// 已激活且已下载的模型列表（空 = 未下载任何模型，相机页仅预览）
|
||
List<ModelBundle> get models => _models;
|
||
|
||
/// 是否成功拉取过目录（即使下载失败也为 true，用于区分"从未联网"与"目录为空"）
|
||
bool get ready => _ready;
|
||
|
||
/// 模型目录拉取失败的错误信息（仅目录级；下载/校验失败见 errorOf）
|
||
String? get error => _error;
|
||
|
||
bool get refreshing => _refreshing;
|
||
|
||
/// 模型名摘要（诊断行展示）：未下载 / 数据集名×n
|
||
String get modelsLabel {
|
||
if (_models.isEmpty) return '未下载';
|
||
return _models.map((m) => m.datasetName).join(',');
|
||
}
|
||
|
||
/// 拉取目录并同步本地模型；并发调用共享同一进行中的刷新。
|
||
Future<void> refresh() {
|
||
if (_refreshing) return _inFlight ?? Future.value();
|
||
_refreshing = true;
|
||
_inFlight = _doRefresh().whenComplete(() {
|
||
_refreshing = false;
|
||
_inFlight = null;
|
||
notifyListeners();
|
||
});
|
||
return _inFlight!;
|
||
}
|
||
|
||
Future<void> _doRefresh() async {
|
||
try {
|
||
await _loadActive();
|
||
final res = await _client
|
||
.get(Uri.parse('$baseUrl/api/v1/app/update'))
|
||
.timeout(const Duration(seconds: 8));
|
||
// 服务器 Content-Type 无 charset，http 包默认按 latin1 解码会乱码 → 显式 utf8
|
||
final body =
|
||
jsonDecode(utf8.decode(res.bodyBytes)) as Map<String, dynamic>;
|
||
final data = body['data'] as Map<String, dynamic>? ?? const {};
|
||
final list = data['models'] as List? ?? const [];
|
||
_catalog = list
|
||
.map((e) => ModelCatalogItem.fromJson(e as Map<String, dynamic>))
|
||
.toList();
|
||
|
||
// 只拉目录不下载；扫描本地已下载（meta+文件齐备）供清单展示
|
||
final downloaded = <int>{};
|
||
for (final item in _catalog) {
|
||
if (await _isLocal(item)) downloaded.add(item.datasetId);
|
||
}
|
||
_downloadedIds
|
||
..clear()
|
||
..addAll(downloaded);
|
||
|
||
await _prune(_catalog);
|
||
// 服务器已下线的数据集移出激活集
|
||
final catalogIds = _catalog.map((c) => c.datasetId).toSet();
|
||
if (_activeIds.any((id) => !catalogIds.contains(id))) {
|
||
_activeIds.removeWhere((id) => !catalogIds.contains(id));
|
||
await _saveActive();
|
||
}
|
||
|
||
_models = await _loadBundles(_catalog);
|
||
_ready = true;
|
||
_error = null;
|
||
} catch (e) {
|
||
if (!_ready) _error = '模型目录拉取失败:$e';
|
||
// 已就绪过则保留旧目录/旧模型，不覆盖 error（下载级错误优先展示）
|
||
}
|
||
}
|
||
|
||
/// 本地是否已有匹配版本的文件（meta 版本+sha256 相符且文件存在）
|
||
Future<bool> _isLocal(ModelCatalogItem item) async {
|
||
final dir = await _modelDir(item.datasetId);
|
||
try {
|
||
final meta = await _readMeta(dir);
|
||
final file = File('${dir.path}/model.tflite');
|
||
return meta != null &&
|
||
meta['version'] == item.version &&
|
||
meta['sha256'] == item.sha256 &&
|
||
await file.exists();
|
||
} catch (e) {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/// 按需下载并激活：流式下载 + sha256 校验 + 落盘（labels/meta）；
|
||
/// 成功自动加入激活集（下载完成即使用）。失败重试一次并记录错误。
|
||
Future<bool> downloadModel(ModelCatalogItem item,
|
||
{void Function(int received, int total)? onProgress}) async {
|
||
// 并发保护：同一数据集已有进行中的下载则直接短路（预置 0 先占位，
|
||
// 使 onProgress 首次回调前的双击/refresh 交错也被 containsKey 拦下）
|
||
if (_progress.containsKey(item.datasetId)) return false;
|
||
_progress[item.datasetId] = 0;
|
||
final dir = await _modelDir(item.datasetId);
|
||
final file = File('${dir.path}/model.tflite');
|
||
try {
|
||
for (var attempt = 0; attempt < 2; attempt++) {
|
||
final ok = await _downloadAndVerify(item, dir, file,
|
||
onProgress: (r, t) {
|
||
_progress[item.datasetId] = t == 0 ? 0 : r / t;
|
||
onProgress?.call(r, t);
|
||
notifyListeners();
|
||
});
|
||
if (ok) {
|
||
_progress.remove(item.datasetId);
|
||
_errors.remove(item.datasetId);
|
||
_downloadedIds.add(item.datasetId);
|
||
await setActive(item.datasetId, true);
|
||
return true;
|
||
}
|
||
await file.delete().catchError((_) => file);
|
||
await File('${dir.path}/model.tflite.part')
|
||
.delete()
|
||
.catchError((_) => file);
|
||
}
|
||
_progress.remove(item.datasetId);
|
||
_errors[item.datasetId] = '下载失败，请重试';
|
||
notifyListeners();
|
||
debugPrint('[ModelManager] 下载失败: ${item.datasetName} ${item.version}');
|
||
return false;
|
||
} catch (e) {
|
||
_progress.remove(item.datasetId);
|
||
_errors[item.datasetId] = '下载异常:$e';
|
||
notifyListeners();
|
||
debugPrint('[ModelManager] 下载异常 ${item.datasetName}: $e');
|
||
return false;
|
||
}
|
||
}
|
||
|
||
Future<bool> _downloadAndVerify(
|
||
ModelCatalogItem item, Directory dir, File file,
|
||
{void Function(int received, int total)? onProgress}) async {
|
||
final part = File('${file.path}.part');
|
||
final sink = part.openWrite();
|
||
var received = 0;
|
||
try {
|
||
final res = await _client
|
||
.send(http.Request('GET', Uri.parse('$baseUrl${item.downloadUrl}')))
|
||
.timeout(const Duration(minutes: 3));
|
||
if (res.statusCode != 200) {
|
||
await sink.close();
|
||
return false;
|
||
}
|
||
final total = res.contentLength ?? item.sizeBytes;
|
||
await for (final chunk in res.stream) {
|
||
sink.add(chunk);
|
||
received += chunk.length;
|
||
onProgress?.call(received, total);
|
||
}
|
||
await sink.close();
|
||
final bytes = await part.readAsBytes();
|
||
final hex = sha256.convert(bytes).toString();
|
||
if (item.sha256.isNotEmpty && hex != item.sha256) {
|
||
debugPrint('[ModelManager] sha256 不匹配: ${item.datasetName} '
|
||
'want=${item.sha256} got=$hex');
|
||
return false;
|
||
}
|
||
await part.rename(file.path);
|
||
await dir.create(recursive: true);
|
||
await File('${dir.path}/labels.json')
|
||
.writeAsString(jsonEncode(item.labels));
|
||
await File('${dir.path}/meta.json').writeAsString(jsonEncode({
|
||
'version': item.version,
|
||
'sha256': item.sha256,
|
||
}));
|
||
debugPrint('[ModelManager] 已下载 ${item.datasetName} '
|
||
'${bytes.length}B -> ${file.path}');
|
||
return true;
|
||
} catch (e) {
|
||
await sink.close().catchError((_) {});
|
||
debugPrint('[ModelManager] 下载异常 ${item.datasetName}: $e');
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/// 清理服务器目录中已下线的数据集模型（不再发布则删本地）
|
||
Future<void> _prune(List<ModelCatalogItem> catalog) async {
|
||
final root = await _rootDir();
|
||
if (!await root.exists()) return;
|
||
final keep = catalog.map((c) => '${c.datasetId}').toSet();
|
||
await for (final e in root.list()) {
|
||
if (e is Directory) {
|
||
// 目录 URI 末尾带 '/'，pathSegments 末位为空串 → 过滤后取目录名
|
||
final name = e.uri.pathSegments.where((s) => s.isNotEmpty).last;
|
||
if (!keep.contains(name)) {
|
||
await e.delete(recursive: true).catchError((_) => e);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/// 设置激活状态（true=使用，false=取消）；持久化到 `root/active.json`。
|
||
/// 未下载的模型不可激活（下载完成由 downloadModel 自动激活）。
|
||
Future<void> setActive(int datasetId, bool active) async {
|
||
final changed =
|
||
active ? _activeIds.add(datasetId) : _activeIds.remove(datasetId);
|
||
if (!changed) return;
|
||
_models = await _loadBundles(_catalog);
|
||
await _saveActive();
|
||
notifyListeners();
|
||
}
|
||
|
||
Future<void> _saveActive() async {
|
||
try {
|
||
final root = await _rootDir();
|
||
await root.create(recursive: true);
|
||
await File('${root.path}/active.json')
|
||
.writeAsString(jsonEncode({'active': _activeIds.toList()}));
|
||
} catch (e) {
|
||
debugPrint('[ModelManager] 激活集持久化失败: $e');
|
||
}
|
||
}
|
||
|
||
Future<void> _loadActive() async {
|
||
if (_activeLoaded) return;
|
||
_activeLoaded = true;
|
||
try {
|
||
final root = await _rootDir();
|
||
final f = File('${root.path}/active.json');
|
||
if (!await f.exists()) return;
|
||
final data = jsonDecode(await f.readAsString()) as Map<String, dynamic>;
|
||
_activeIds
|
||
..clear()
|
||
..addAll((data['active'] as List? ?? const [])
|
||
.map((e) => (e as num).toInt()));
|
||
} catch (e) {
|
||
debugPrint('[ModelManager] 激活集读取失败: $e');
|
||
}
|
||
}
|
||
|
||
Future<List<ModelBundle>> _loadBundles(
|
||
List<ModelCatalogItem> catalog) async {
|
||
final bundles = <ModelBundle>[];
|
||
for (final item in catalog) {
|
||
if (!_activeIds.contains(item.datasetId)) continue;
|
||
try {
|
||
final dir = await _modelDir(item.datasetId);
|
||
final file = File('${dir.path}/model.tflite');
|
||
if (!await file.exists()) continue;
|
||
final labels = await File('${dir.path}/labels.json').exists()
|
||
? (jsonDecode(
|
||
await File('${dir.path}/labels.json').readAsString())
|
||
as List)
|
||
.map((e) => e.toString())
|
||
.toList()
|
||
: item.labels;
|
||
bundles.add(ModelBundle(
|
||
datasetId: item.datasetId,
|
||
datasetName: item.datasetName,
|
||
version: item.version,
|
||
labels: labels,
|
||
bytes: await file.readAsBytes(),
|
||
));
|
||
} catch (e) {
|
||
debugPrint('[ModelManager] 读取 ${item.datasetName} 失败: $e');
|
||
}
|
||
}
|
||
return bundles;
|
||
}
|
||
|
||
Future<Map<String, dynamic>?> _readMeta(Directory dir) async {
|
||
final f = File('${dir.path}/meta.json');
|
||
if (!await f.exists()) return null;
|
||
try {
|
||
return jsonDecode(await f.readAsString()) as Map<String, dynamic>;
|
||
} catch (_) {
|
||
return null;
|
||
}
|
||
}
|
||
|
||
Future<Directory> _rootDir() async {
|
||
if (_rootDirOverride != null) return _rootDirOverride();
|
||
final support = await getApplicationSupportDirectory();
|
||
return Directory('${support.path}/models');
|
||
}
|
||
|
||
Future<Directory> _modelDir(int datasetId) async {
|
||
final root = await _rootDir();
|
||
final dir = Directory('${root.path}/$datasetId');
|
||
await dir.create(recursive: true);
|
||
return dir;
|
||
}
|
||
}
|