refactor: 重构聊天模块支持 SSE 断线重连及用户上下文隔离

2026-03-30 09:06:10 +08:00
parent 1aac62f39e
commit 4285b4ec80
28 changed files with 1624 additions and 658 deletions
@@ -0,0 +1,88 @@
+// ignore_for_file: invalid_use_of_protected_member, invalid_use_of_visible_for_testing_member
+
+part of 'chat_bloc.dart';
+
+extension _ChatBlocAttachments on ChatBloc {
+  void _syncUploadedAttachments({
+    required String messageId,
+    required List<UploadedAttachment> uploadedAttachments,
+  }) {
+    if (uploadedAttachments.isEmpty) {
+      _markAttachmentUploadDone(messageId);
+      return;
+    }
+    final items = state.items.map((item) {
+      if (item is! TextMessageItem || item.id != messageId) {
+        return item;
+      }
+      final synced = item.attachments.map((attachment) {
+        final localPath = attachment['path'];
+        if (localPath is! String || localPath.isEmpty) {
+          return <String, dynamic>{...attachment, 'uploading': false};
+        }
+        UploadedAttachment? matched;
+        for (final candidate in uploadedAttachments) {
+          if (candidate.localPath == localPath) {
+            matched = candidate;
+            break;
+          }
+        }
+        if (matched == null) {
+          return <String, dynamic>{...attachment, 'uploading': false};
+        }
+        return <String, dynamic>{
+          ...attachment,
+          'url': matched.url,
+          'mimeType': matched.mimeType,
+          'uploading': false,
+        };
+      }).toList();
+      return item.copyWith(attachments: synced);
+    }).toList();
+    emit(state.copyWith(items: items));
+  }
+
+  void _markAttachmentUploadDone(String messageId) {
+    final items = state.items.map((item) {
+      if (item is! TextMessageItem || item.id != messageId) {
+        return item;
+      }
+      final done = item.attachments
+          .map(
+            (attachment) => <String, dynamic>{
+              ...attachment,
+              'uploading': false,
+            },
+          )
+          .toList();
+      return item.copyWith(attachments: done);
+    }).toList();
+    emit(state.copyWith(items: items));
+  }
+
+  Future<Uint8List?> _loadAttachmentPreview(String previewPath) async {
+    final cached = _attachmentPreviewCache[previewPath];
+    if (cached != null) {
+      return cached;
+    }
+    final pending = _attachmentPreviewInflight[previewPath];
+    if (pending != null) {
+      return pending;
+    }
+
+    final future = (() async {
+      try {
+        final bytes = await _service.fetchAttachmentPreview(previewPath);
+        _attachmentPreviewCache[previewPath] = bytes;
+        return bytes;
+      } catch (_) {
+        return null;
+      } finally {
+        _attachmentPreviewInflight.remove(previewPath);
+      }
+    })();
+
+    _attachmentPreviewInflight[previewPath] = future;
+    return future;
+  }
+}