Add MrGameEng.Net: WebSocket transport + delta component replication

Browsers can't speak UDP, so WebSocket is the engine's one transport. The server side is a dependency-free RFC 6455 implementation over TcpListener (handshake, frame codec with masking and fragmentation, ping/pong — unit-tested against the RFC example vectors); the client wraps ClientWebSocket, which works on desktop and maps to the browser WebSocket in Blazor WASM. Both sit behind the poll-based INetConnection so simulation systems drain messages from their own thread; client sends are chained fire-and-forget (no blocking — wasm-safe). Replication is server-authoritative: games register unmanaged component types in a ReplicationSchema (same order both sides, up to 32 types), ReplicationServer snapshots entities carrying NetId once per send and ships each connection only the components that changed since its last snapshot — a reliable ordered transport needs no acks for deltas. New connections receive the full state through the same path; despawns are tracked by set difference. ReplicationClient applies snapshots to a local EntityStore and raises EntitySpawned so the game can decorate replicated entities with presentation components. Covered by 16 tests including a real loopback exchange between WebSocketClient and WebSocketServer. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-06-12 23:35:57 +03:00
parent 10898b08a0
commit 3438ed77f6
16 changed files with 1492 additions and 0 deletions
@@ -0,0 +1,88 @@
+using MrGameEng.Net;
+using Xunit;
+
+namespace MrGameEng.Net.Tests;
+
+public class WebSocketProtocolTests
+{
+    [Fact]
+    public void AcceptKey_MatchesRfc6455Example()
+    {
+        // Пример рукопожатия прямо из RFC 6455, раздел 1.3.
+        Assert.Equal(
+            "s3pPLMBiTxaQ9kYGzzhZRbK+xOo=",
+            WebSocketProtocol.AcceptKey("dGhlIHNhbXBsZSBub25jZQ==")
+        );
+    }
+
+    [Theory]
+    [InlineData(0)]
+    [InlineData(125)]
+    [InlineData(126)]
+    [InlineData(70_000)]
+    public void Frame_Roundtrips_Unmasked(int payloadLength)
+    {
+        var payload = MakePayload(payloadLength);
+        var frame = WebSocketProtocol.EncodeFrame(payload, WebSocketOpcode.Binary);
+
+        using var stream = new MemoryStream(frame);
+        Assert.True(
+            WebSocketProtocol.TryReadFrame(stream, out var opcode, out var fin, out var decoded)
+        );
+        Assert.Equal(WebSocketOpcode.Binary, opcode);
+        Assert.True(fin);
+        Assert.Equal(payload, decoded);
+    }
+
+    [Fact]
+    public void Frame_Roundtrips_Masked()
+    {
+        var payload = MakePayload(1000);
+        var frame = WebSocketProtocol.EncodeFrame(
+            payload,
+            WebSocketOpcode.Binary,
+            maskKey: [0x12, 0x34, 0x56, 0x78]
+        );
+
+        using var stream = new MemoryStream(frame);
+        Assert.True(WebSocketProtocol.TryReadFrame(stream, out _, out _, out var decoded));
+        Assert.Equal(payload, decoded);
+    }
+
+    [Fact]
+    public void TryReadHandshakeKey_ExtractsHeader()
+    {
+        var request =
+            "GET /chat HTTP/1.1\r\n"
+            + "Host: localhost\r\n"
+            + "Upgrade: websocket\r\n"
+            + "Connection: Upgrade\r\n"
+            + "Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==\r\n"
+            + "Sec-WebSocket-Version: 13\r\n"
+            + "\r\n";
+        using var stream = new MemoryStream(System.Text.Encoding.ASCII.GetBytes(request));
+
+        Assert.True(WebSocketProtocol.TryReadHandshakeKey(stream, out var key));
+        Assert.Equal("dGhlIHNhbXBsZSBub25jZQ==", key);
+    }
+
+    [Fact]
+    public void TryReadFrame_TruncatedStream_ReturnsFalse()
+    {
+        var frame = WebSocketProtocol.EncodeFrame(MakePayload(100), WebSocketOpcode.Binary);
+        using var stream = new MemoryStream(frame, 0, frame.Length - 10);
+
+        Assert.False(WebSocketProtocol.TryReadFrame(stream, out _, out _, out _));
+    }
+
+    private static byte[] MakePayload(int length)
+    {
+        var payload = new byte[length];
+        for (var i = 0; i < length; i++)
+        {
+            payload[i] = (byte)(i * 31);
+        }
+
+        return payload;
+    }
+}