basic nostr actors

test/fake_relay_connection.dart

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+import 'dart:async';
+import 'dart:convert';
+import 'package:swarm/swarm.dart';
+
+final class FakeRelayConnection implements RelayConnection {
+  final _controller = StreamController<String>.broadcast();
+  final sentMessages = <String>[];
+  final queuedResponses = <String>[];
+  bool isConnected = false;
+  bool autoRespond = true;
+  bool throwOnConnect = false;
+  void Function(String subId)? onReq;
+
+  @override
+  Future<void> connect() async {
+    if (throwOnConnect) throw Exception('connection failed');
+    isConnected = true;
+  }
+
+  @override
+  Future<void> send(String message) async {
+    sentMessages.add(message);
+    if (queuedResponses.isNotEmpty) {
+      final response = queuedResponses.removeAt(0);
+      Future(() => _controller.add(response));
+      return;
+    }
+    _tryAutoRespond(message);
+  }
+
+  @override
+  Stream<String> get messages => _controller.stream;
+
+  @override
+  Future<void> close() async => isConnected = false;
+
+  void push(String message) => _controller.add(message);
+
+  Future<void> dispose() => _controller.close();
+
+  void _tryAutoRespond(String message) {
+    if (!autoRespond) return;
+    try {
+      final list = jsonDecode(message) as List;
+      if (list[0] == 'EVENT') {
+        final event = list[1] as Map<String, dynamic>;
+        final id = event['id'] as String;
+        Future(() => _controller.add(jsonEncode(['OK', id, true, ''])));
+      } else if (list[0] == 'REQ') {
+        final subId = list[1] as String;
+        Future(() => onReq?.call(subId));
+      }
+    } catch (_) {
+      // malformed, ignore
+    }
+  }
+}