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using System;
using System.IO;
using System.Net;
using System.Threading;
using System.Threading.Channels;
using System.Threading.Tasks;
using Impostor.Api.Games;
using Impostor.Api.Net.Messages;
using Impostor.Server.Config;
using Impostor.Server.Net;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.ObjectPool;
using Microsoft.Extensions.Options;
namespace Impostor.Server.Recorder
{
/// <summary>
/// Records all packets received in <see cref="ClientRecorder.HandleMessageAsync"/>.
/// </summary>
internal class PacketRecorder : BackgroundService
{
private readonly string _path;
private readonly ILogger<PacketRecorder> _logger;
private readonly ObjectPool<PacketSerializationContext> _pool;
private readonly Channel<byte[]> _channel;
public PacketRecorder(ILogger<PacketRecorder> logger, IOptions<DebugConfig> options, ObjectPool<PacketSerializationContext> pool)
{
var name = $"session_{DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()}.dat";
_path = Path.Combine(options.Value.GameRecorderPath, name);
_logger = logger;
_pool = pool;
_channel = Channel.CreateUnbounded<byte[]>(new UnboundedChannelOptions
{
SingleReader = true,
SingleWriter = false,
});
}
protected override async Task ExecuteAsync(CancellationToken stoppingToken)
{
_logger.LogInformation("PacketRecorder is enabled, writing packets to {0}.", _path);
var writer = File.Open(_path, FileMode.CreateNew, FileAccess.Write, FileShare.Read);
// Handle messages.
try
{
while (!stoppingToken.IsCancellationRequested)
{
var result = await _channel.Reader.ReadAsync(stoppingToken);
await writer.WriteAsync(result, stoppingToken);
await writer.FlushAsync(stoppingToken);
}
}
catch (TaskCanceledException)
{
}
// Clean up.
await writer.DisposeAsync();
}
public async Task WriteConnectAsync(ClientRecorder client)
{
_logger.LogTrace("Writing Connect.");
var context = _pool.Get();
try
{
WriteHeader(context, RecordedPacketType.Connect);
WriteClient(context, client, true);
WriteLength(context);
await WriteAsync(context.Stream);
}
finally
{
_pool.Return(context);
}
}
public async Task WriteDisconnectAsync(ClientRecorder client, string reason)
{
_logger.LogTrace("Writing Disconnect.");
var context = _pool.Get();
try
{
WriteHeader(context, RecordedPacketType.Disconnect);
WriteClient(context, client, false);
context.Writer.Write(reason);
WriteLength(context);
await WriteAsync(context.Stream);
}
finally
{
_pool.Return(context);
}
}
public async Task WriteMessageAsync(ClientRecorder client, IMessageReader reader, MessageType messageType)
{
_logger.LogTrace("Writing Message.");
var context = _pool.Get();
try
{
WriteHeader(context, RecordedPacketType.Message);
WriteClient(context, client, false);
WritePacket(context, reader, messageType);
WriteLength(context);
await WriteAsync(context.Stream);
}
finally
{
_pool.Return(context);
}
}
public async Task WriteGameCreatedAsync(ClientRecorder client, GameCode gameCode)
{
_logger.LogTrace("Writing GameCreated {0}.", gameCode);
var context = _pool.Get();
try
{
WriteHeader(context, RecordedPacketType.GameCreated);
WriteClient(context, client, false);
WriteGameCode(context, gameCode);
WriteLength(context);
await WriteAsync(context.Stream);
}
finally
{
_pool.Return(context);
}
}
private static void WriteHeader(PacketSerializationContext context, RecordedPacketType type)
{
// Length placeholder.
context.Writer.Write((int) 0);
context.Writer.Write((byte) type);
}
private static void WriteClient(PacketSerializationContext context, ClientBase client, bool full)
{
var address = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 12345);
var addressBytes = address.Address.GetAddressBytes();
context.Writer.Write(client.Id);
if (full)
{
context.Writer.Write((byte) addressBytes.Length);
context.Writer.Write(addressBytes);
context.Writer.Write((ushort) address.Port);
context.Writer.Write(client.Name);
}
}
private static void WritePacket(PacketSerializationContext context, IMessageReader reader, MessageType messageType)
{
context.Writer.Write((byte) messageType);
context.Writer.Write((byte) reader.Tag);
context.Writer.Write((int) reader.Length);
context.Writer.Write(reader.Buffer, reader.Offset, reader.Length);
}
private static void WriteGameCode(PacketSerializationContext context, in GameCode gameCode)
{
context.Writer.Write(gameCode.Code);
}
private static void WriteLength(PacketSerializationContext context)
{
var length = context.Stream.Position;
context.Stream.Position = 0;
context.Writer.Write((int) length);
context.Stream.Position = length;
}
private async Task WriteAsync(MemoryStream data)
{
await _channel.Writer.WriteAsync(data.ToArray());
}
}
}
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