feat: listen to stream info on stream page

fix: disable cache read/write in RxFilter

lib/pages/stream.dart

@@ -1,10 +1,12 @@
 import 'package:cached_network_image/cached_network_image.dart';
 import 'package:chewie/chewie.dart';
 import 'package:flutter/material.dart';
+import 'package:ndk/ndk.dart';
 import 'package:video_player/video_player.dart';
 import 'package:wakelock_plus/wakelock_plus.dart';
 import 'package:zap_stream_flutter/imgproxy.dart';
 import 'package:zap_stream_flutter/main.dart';
+import 'package:zap_stream_flutter/rx_filter.dart';
 import 'package:zap_stream_flutter/theme.dart';
 import 'package:zap_stream_flutter/utils.dart';
 import 'package:zap_stream_flutter/widgets/button.dart';
@@ -72,6 +74,23 @@ class _StreamPage extends State<StreamPage> {
 
   @override
   Widget build(BuildContext context) {
+    return RxFilter<Nip01Event>(
+      relays: widget.stream.info.relays,
+      filters: [
+        Filter(
+          kinds: [widget.stream.event.kind],
+          authors: [widget.stream.event.pubKey],
+          dTags: [widget.stream.event.getDtag()!],
+        ),
+      ],
+      builder: (ctx, state) {
+        final stream = StreamEvent(state?.firstOrNull ?? widget.stream.event);
+        return _buildStream(context, stream);
+      },
+    );
+  }
+
+  Widget _buildStream(BuildContext context, StreamEvent stream) {
     return Column(
       spacing: 4,
       crossAxisAlignment: CrossAxisAlignment.start,
@@ -84,24 +103,21 @@ class _StreamPage extends State<StreamPage> {
                   : Container(
                     color: LAYER_1,
                     child:
-                        (widget.stream.info.image?.isNotEmpty ?? false)
+                        (stream.info.image?.isNotEmpty ?? false)
                             ? CachedNetworkImage(
-                              imageUrl: proxyImg(
-                                context,
-                                widget.stream.info.image!,
-                              ),
+                              imageUrl: proxyImg(context, stream.info.image!),
                             )
                             : null,
                   ),
         ),
         Text(
-          widget.stream.info.title ?? "",
+          stream.info.title ?? "",
           style: TextStyle(fontWeight: FontWeight.w600, fontSize: 18),
         ),
         Row(
           mainAxisAlignment: MainAxisAlignment.spaceBetween,
           children: [
-            ProfileWidget.pubkey(widget.stream.info.host),
+            ProfileWidget.pubkey(stream.info.host),
             Row(
               spacing: 8,
               children: [
@@ -118,13 +134,13 @@ class _StreamPage extends State<StreamPage> {
                       constraints: BoxConstraints.expand(),
                       builder: (ctx) {
                         return ZapWidget(
-                          pubkey: widget.stream.info.host,
-                          target: widget.stream.event,
+                          pubkey: stream.info.host,
+                          target: stream.event,
                           zapTags:
                               // tag goal onto zap request
-                              widget.stream.info.goal != null
+                              stream.info.goal != null
                                   ? [
-                                    ["e", widget.stream.info.goal!],
+                                    ["e", stream.info.goal!],
                                   ]
                                   : null,
                         );
@@ -132,11 +148,11 @@ class _StreamPage extends State<StreamPage> {
                     );
                   },
                 ),
-                if (widget.stream.info.participants != null)
+                if (stream.info.participants != null)
                   PillWidget(
                     color: LAYER_1,
                     child: Text(
-                      "${widget.stream.info.participants} viewers",
+                      "${stream.info.participants} viewers",
                       style: TextStyle(
                         fontSize: 12,
                         fontWeight: FontWeight.w500,
@@ -147,7 +163,7 @@ class _StreamPage extends State<StreamPage> {
             ),
           ],
         ),
-        Expanded(child: ChatWidget(stream: widget.stream)),
+        Expanded(child: ChatWidget(stream: stream)),
       ],
     );
   }

lib/rx_filter.dart

@@ -37,8 +37,6 @@ class _RxFilter<T> extends State<RxFilter<T>> {
     developer.log("RX:SEDNING ${widget.filters}");
     _response = ndk.requests.subscription(
       filters: widget.filters,
-      cacheRead: true,
-      cacheWrite: true,
       explicitRelays: widget.relays,
     );
     if (!widget.leaveOpen) {
@@ -55,7 +53,6 @@ class _RxFilter<T> extends State<RxFilter<T>> {
         })
         .listen((events) {
           setState(() {
-            _events ??= HashMap();
             developer.log(
               "RX:GOT ${events.length} events for ${widget.filters}",
             );
@@ -66,9 +63,10 @@ class _RxFilter<T> extends State<RxFilter<T>> {
 
   void _replaceInto(Nip01Event ev) {
     final evKey = _eventKey(ev);
-    final existing = _events?[evKey];
+    _events ??= HashMap();
+    final existing = _events![evKey];
     if (existing == null || existing.$1 < ev.createdAt) {
-      _events?[evKey] = (
+      _events![evKey] = (
         ev.createdAt,
         widget.mapper != null ? widget.mapper!(ev) : ev as T,
       );
@@ -79,7 +77,7 @@ class _RxFilter<T> extends State<RxFilter<T>> {
     if ([0, 3].contains(ev.kind) || (ev.kind >= 10000 && ev.kind < 20000)) {
       return "${ev.kind}:${ev.pubKey}";
     } else if (ev.kind >= 30000 && ev.kind < 40000) {
-      return "${ev.kind}:${ev.pubKey}:${ev.getDtag()}";
+      return "${ev.kind}:${ev.pubKey}:${ev.getDtag()!}";
     } else {
       return ev.id;
     }

lib/widgets/chat.dart

@@ -22,18 +22,16 @@ class ChatWidget extends StatelessWidget {
       muteLists.add(ndk.accounts.getPublicKey()!);
     }
 
-    return RxFilter<Nip01Event>(
-      key: Key("stream:chat:${stream.aTag}"),
-      relays: stream.info.relays,
-      filters: [
+    var filters = [
       Filter(kinds: [1311, 9735], limit: 200, aTags: [stream.aTag]),
       Filter(kinds: [Nip51List.kMute], authors: muteLists),
-        ...(stream.info.goal != null
-            ? [
-              Filter(kinds: [9041], ids: [stream.info.goal!]),
-            ]
-            : []),
-      ],
+    ];
+    if (stream.info.goal != null) {
+      filters.add(Filter(kinds: [9041], ids: [stream.info.goal!]));
+    }
+    return RxFilter<Nip01Event>(
+      relays: stream.info.relays,
+      filters: filters,
       builder: (ctx, state) {
         final mutedPubkeys =
             (state ?? [])