mirror of
https://github.com/dz0ny/meshcore-sar.git
synced 2026-08-11 16:30:28 +00:00
369 lines
12 KiB
Dart
369 lines
12 KiB
Dart
import 'dart:async';
|
|
import 'dart:convert';
|
|
import 'package:flutter/foundation.dart';
|
|
import 'package:shared_preferences/shared_preferences.dart';
|
|
import '../models/contact.dart';
|
|
import '../utils/image_message_parser.dart';
|
|
|
|
/// Reassembly state for one incoming image session.
|
|
class ImageSession {
|
|
final String sessionId;
|
|
final ImageFormat format;
|
|
final int total;
|
|
final int width;
|
|
final int height;
|
|
final List<ImagePacket?> fragments; // indexed by fragment.index
|
|
|
|
ImageSession({
|
|
required this.sessionId,
|
|
required this.format,
|
|
required this.total,
|
|
required this.width,
|
|
required this.height,
|
|
}) : fragments = List.filled(total, null);
|
|
|
|
int get receivedCount => fragments.where((f) => f != null).length;
|
|
bool get isComplete => receivedCount == total;
|
|
|
|
/// Reassemble the complete image bytes, or null if any fragment is missing.
|
|
Uint8List? get imageBytes => reassembleImage(fragments);
|
|
}
|
|
|
|
/// Manages incoming image sessions and outgoing image caches.
|
|
///
|
|
/// Mirrors [VoiceProvider] in architecture: on-demand fetch, deferred serving,
|
|
/// persistent storage of both incoming and outgoing session data.
|
|
class ImageProvider with ChangeNotifier {
|
|
static const String _storageKey = 'stored_image_sessions_v1';
|
|
static const Duration _outgoingTtl = Duration(minutes: 15);
|
|
|
|
/// Incoming sessions keyed by sessionId.
|
|
final Map<String, ImageSession> _sessions = {};
|
|
|
|
/// Outgoing sessions cached for deferred serving.
|
|
final Map<String, _OutgoingSession> _outgoing = {};
|
|
|
|
/// Hook for sending a raw binary payload to a contact.
|
|
Future<void> Function({
|
|
required Uint8List contactPath,
|
|
required int contactPathLen,
|
|
required Uint8List payload,
|
|
})?
|
|
sendRawPacketCallback;
|
|
|
|
ImageProvider() {
|
|
_restore();
|
|
}
|
|
|
|
// ── Accessors ────────────────────────────────────────────────────────────
|
|
|
|
ImageSession? session(String sessionId) => _sessions[sessionId];
|
|
bool isComplete(String sessionId) =>
|
|
_sessions[sessionId]?.isComplete ?? false;
|
|
bool hasOutgoing(String sessionId) => _outgoing.containsKey(sessionId);
|
|
|
|
List<int> missingFragmentIndices(String sessionId) {
|
|
final session = _sessions[sessionId];
|
|
if (session == null) return const [];
|
|
final missing = <int>[];
|
|
for (var i = 0; i < session.total; i++) {
|
|
if (session.fragments[i] == null) missing.add(i);
|
|
}
|
|
return missing;
|
|
}
|
|
|
|
// ── Incoming fragment reception ──────────────────────────────────────────
|
|
|
|
/// Add a received [fragment]. Creates the session on first fragment using
|
|
/// metadata from the fragment itself (requires envelope to have been
|
|
/// announced first; if not, defaults width/height to 0 — corrected on save).
|
|
///
|
|
/// Returns true when the session just became complete.
|
|
bool addFragment(ImagePacket fragment, {int width = 0, int height = 0}) {
|
|
_sessions.putIfAbsent(
|
|
fragment.sessionId,
|
|
() => ImageSession(
|
|
sessionId: fragment.sessionId,
|
|
format: fragment.format,
|
|
total: fragment.total,
|
|
width: width,
|
|
height: height,
|
|
),
|
|
);
|
|
|
|
final session = _sessions[fragment.sessionId]!;
|
|
if (fragment.index < session.total) {
|
|
session.fragments[fragment.index] = fragment;
|
|
}
|
|
|
|
final justComplete = session.isComplete;
|
|
unawaited(_persist());
|
|
notifyListeners();
|
|
return justComplete;
|
|
}
|
|
|
|
/// Register envelope metadata for a session (called when IE1 is received
|
|
/// before any binary fragments arrive).
|
|
void registerEnvelope(ImageEnvelope envelope) {
|
|
_sessions.putIfAbsent(
|
|
envelope.sessionId,
|
|
() => ImageSession(
|
|
sessionId: envelope.sessionId,
|
|
format: envelope.format,
|
|
total: envelope.total,
|
|
width: envelope.width,
|
|
height: envelope.height,
|
|
),
|
|
);
|
|
// Update dimensions if we created the session from a fragment (w/h = 0).
|
|
final session = _sessions[envelope.sessionId]!;
|
|
if (session.width == 0 || session.height == 0) {
|
|
_sessions[envelope.sessionId] = ImageSession(
|
|
sessionId: envelope.sessionId,
|
|
format: envelope.format,
|
|
total: envelope.total,
|
|
width: envelope.width,
|
|
height: envelope.height,
|
|
);
|
|
// Copy existing fragments into the new session.
|
|
final old = _sessions[envelope.sessionId]!;
|
|
for (var i = 0; i < session.fragments.length && i < old.total; i++) {
|
|
old.fragments[i] = session.fragments[i];
|
|
}
|
|
}
|
|
notifyListeners();
|
|
}
|
|
|
|
// ── Outgoing session management ──────────────────────────────────────────
|
|
|
|
/// Cache encoded fragments for deferred serving.
|
|
///
|
|
/// Also registers the session as complete in [_sessions] so the local
|
|
/// bubble can display the sent image immediately without a fetch round-trip.
|
|
void cacheOutgoingSession(
|
|
String sessionId,
|
|
List<ImagePacket> fragments,
|
|
ImageEnvelope envelope,
|
|
) {
|
|
if (fragments.isEmpty) return;
|
|
_evictExpiredOutgoing();
|
|
_outgoing[sessionId] = _OutgoingSession(
|
|
sessionId: sessionId,
|
|
fragments: List<ImagePacket>.from(fragments),
|
|
envelope: envelope,
|
|
cachedAt: DateTime.now(),
|
|
);
|
|
|
|
// Populate incoming session so the bubble shows the image right away.
|
|
final session = ImageSession(
|
|
sessionId: sessionId,
|
|
format: envelope.format,
|
|
total: fragments.length,
|
|
width: envelope.width,
|
|
height: envelope.height,
|
|
);
|
|
for (final f in fragments) {
|
|
if (f.index < session.total) session.fragments[f.index] = f;
|
|
}
|
|
_sessions[sessionId] = session;
|
|
|
|
unawaited(_persist());
|
|
notifyListeners();
|
|
}
|
|
|
|
/// Stream cached image fragments to [requester] via raw binary packets.
|
|
Future<bool> serveSessionTo({
|
|
required String sessionId,
|
|
required Contact requester,
|
|
Set<int>? requestedIndices,
|
|
}) async {
|
|
final cached = _outgoing[sessionId];
|
|
if (cached == null) {
|
|
debugPrint('⚠️ [ImageProvider] No cached session for $sessionId');
|
|
return false;
|
|
}
|
|
if (sendRawPacketCallback == null) {
|
|
debugPrint('⚠️ [ImageProvider] sendRawPacketCallback not set');
|
|
return false;
|
|
}
|
|
if (requester.outPathLen < 0) {
|
|
debugPrint('⚠️ [ImageProvider] ${requester.advName} has no direct path');
|
|
return false;
|
|
}
|
|
|
|
for (final fragment in cached.fragments) {
|
|
if (requestedIndices != null &&
|
|
!requestedIndices.contains(fragment.index)) {
|
|
continue;
|
|
}
|
|
try {
|
|
await sendRawPacketCallback!(
|
|
contactPath: requester.outPath,
|
|
contactPathLen: requester.outPathLen,
|
|
payload: fragment.encodeBinary(),
|
|
);
|
|
} catch (e, st) {
|
|
debugPrint('❌ [ImageProvider] Serve error for $sessionId: $e\n$st');
|
|
return false;
|
|
}
|
|
}
|
|
debugPrint(
|
|
'📷 [ImageProvider] Served ${cached.fragments.length} fragments of $sessionId',
|
|
);
|
|
return true;
|
|
}
|
|
|
|
// ── Persistence ──────────────────────────────────────────────────────────
|
|
|
|
Future<void> clearAll() async {
|
|
_sessions.clear();
|
|
_outgoing.clear();
|
|
notifyListeners();
|
|
try {
|
|
final prefs = await SharedPreferences.getInstance();
|
|
await prefs.remove(_storageKey);
|
|
} catch (e) {
|
|
debugPrint('❌ [ImageProvider] Failed to clear storage: $e');
|
|
}
|
|
}
|
|
|
|
void _evictExpiredOutgoing() {
|
|
final now = DateTime.now();
|
|
_outgoing.removeWhere((_, s) => now.difference(s.cachedAt) > _outgoingTtl);
|
|
}
|
|
|
|
Future<void> _persist() async {
|
|
try {
|
|
_evictExpiredOutgoing();
|
|
final prefs = await SharedPreferences.getInstance();
|
|
final payload = <String, dynamic>{
|
|
'incoming': _sessions.values
|
|
.map(
|
|
(s) => {
|
|
'sessionId': s.sessionId,
|
|
'fmtId': s.format.id,
|
|
'total': s.total,
|
|
'width': s.width,
|
|
'height': s.height,
|
|
'fragments': s.fragments
|
|
.map(
|
|
(f) => f == null ? null : base64.encode(f.encodeBinary()),
|
|
)
|
|
.toList(),
|
|
},
|
|
)
|
|
.toList(),
|
|
'outgoing': _outgoing.values
|
|
.map(
|
|
(s) => {
|
|
'sessionId': s.sessionId,
|
|
'cachedAt': s.cachedAt.millisecondsSinceEpoch,
|
|
'envelope': s.envelope.encode(),
|
|
'fragments': s.fragments
|
|
.map((f) => base64.encode(f.encodeBinary()))
|
|
.toList(),
|
|
},
|
|
)
|
|
.toList(),
|
|
};
|
|
await prefs.setString(_storageKey, jsonEncode(payload));
|
|
} catch (e) {
|
|
debugPrint('❌ [ImageProvider] Failed to persist: $e');
|
|
}
|
|
}
|
|
|
|
Future<void> _restore() async {
|
|
try {
|
|
final prefs = await SharedPreferences.getInstance();
|
|
final raw = prefs.getString(_storageKey);
|
|
if (raw == null || raw.isEmpty) return;
|
|
|
|
final parsed = jsonDecode(raw) as Map<String, dynamic>;
|
|
|
|
for (final item in (parsed['incoming'] as List<dynamic>? ?? [])) {
|
|
final map = item as Map<String, dynamic>;
|
|
final sessionId = map['sessionId'] as String?;
|
|
final fmtId = map['fmtId'] as int?;
|
|
final total = map['total'] as int?;
|
|
final width = map['width'] as int? ?? 256;
|
|
final height = map['height'] as int? ?? 256;
|
|
if (sessionId == null || fmtId == null || total == null || total <= 0) {
|
|
continue;
|
|
}
|
|
final session = ImageSession(
|
|
sessionId: sessionId,
|
|
format: ImageFormat.fromId(fmtId),
|
|
total: total,
|
|
width: width,
|
|
height: height,
|
|
);
|
|
final frags = map['fragments'] as List<dynamic>? ?? [];
|
|
for (var i = 0; i < frags.length && i < total; i++) {
|
|
final enc = frags[i] as String?;
|
|
if (enc == null || enc.isEmpty) continue;
|
|
final pkt = ImagePacket.tryParseBinary(base64.decode(enc));
|
|
if (pkt != null && pkt.index < total) {
|
|
session.fragments[pkt.index] = pkt;
|
|
}
|
|
}
|
|
_sessions[sessionId] = session;
|
|
}
|
|
|
|
for (final item in (parsed['outgoing'] as List<dynamic>? ?? [])) {
|
|
final map = item as Map<String, dynamic>;
|
|
final sessionId = map['sessionId'] as String?;
|
|
final cachedMs = map['cachedAt'] as int?;
|
|
final envelopeText = map['envelope'] as String?;
|
|
if (sessionId == null || cachedMs == null || envelopeText == null) {
|
|
continue;
|
|
}
|
|
final envelope = ImageEnvelope.tryParse(envelopeText);
|
|
if (envelope == null) continue;
|
|
final cachedAt = DateTime.fromMillisecondsSinceEpoch(cachedMs);
|
|
if (DateTime.now().difference(cachedAt) > _outgoingTtl) continue;
|
|
|
|
final fragsRaw = map['fragments'] as List<dynamic>? ?? [];
|
|
final fragments = <ImagePacket>[];
|
|
for (final enc in fragsRaw) {
|
|
final pkt = ImagePacket.tryParseBinary(
|
|
base64.decode((enc ?? '') as String),
|
|
);
|
|
if (pkt != null) fragments.add(pkt);
|
|
}
|
|
if (fragments.isNotEmpty) {
|
|
_outgoing[sessionId] = _OutgoingSession(
|
|
sessionId: sessionId,
|
|
fragments: fragments,
|
|
envelope: envelope,
|
|
cachedAt: cachedAt,
|
|
);
|
|
}
|
|
}
|
|
|
|
if (_sessions.isNotEmpty || _outgoing.isNotEmpty) {
|
|
debugPrint(
|
|
'📷 [ImageProvider] Restored ${_sessions.length} incoming, '
|
|
'${_outgoing.length} outgoing sessions',
|
|
);
|
|
notifyListeners();
|
|
}
|
|
} catch (e) {
|
|
debugPrint('❌ [ImageProvider] Failed to restore: $e');
|
|
}
|
|
}
|
|
}
|
|
|
|
class _OutgoingSession {
|
|
final String sessionId;
|
|
final List<ImagePacket> fragments;
|
|
final ImageEnvelope envelope;
|
|
final DateTime cachedAt;
|
|
|
|
const _OutgoingSession({
|
|
required this.sessionId,
|
|
required this.fragments,
|
|
required this.envelope,
|
|
required this.cachedAt,
|
|
});
|
|
}
|