mirror of
https://github.com/BililiveRecorder/BililiveRecorder.git
synced 2024-11-16 11:42:22 +08:00
430 lines
14 KiB
C#
430 lines
14 KiB
C#
using BililiveRecorder.Core.Config;
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using NLog;
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using System;
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using System.IO;
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using System.IO.Compression;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using Timer = System.Timers.Timer;
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namespace BililiveRecorder.Core
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{
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/**
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* 直播状态监控
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* 分为弹幕连接和HTTP轮询两部分
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*
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* 弹幕连接：
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* 一直保持连接，并把收到的弹幕保存到数据库
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*
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* HTTP轮询：
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* 只有在监控启动时运行，根据直播状态触发事件
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*
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*
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* */
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public class StreamMonitor : IStreamMonitor
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{
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private static readonly Logger logger = LogManager.GetCurrentClassLogger();
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private readonly Func<TcpClient> funcTcpClient;
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private readonly ConfigV1 config;
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private const string DM_SERVER_HOST = "broadcastlv.chat.bilibili.com";
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private const int DM_SERVER_PORT = 2243;
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#pragma warning disable IDE1006 // 命名样式
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private bool dmTcpConnected => dmClient?.Connected ?? false;
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#pragma warning restore IDE1006 // 命名样式
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private Exception dmError = null;
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private TcpClient dmClient;
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private NetworkStream dmNetStream;
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private Thread dmReceiveMessageLoopThread;
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private CancellationTokenSource dmTokenSource = null;
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private readonly Timer httpTimer;
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public int Roomid { get; private set; } = 0;
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public bool IsMonitoring { get; private set; } = false;
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public event RoomInfoUpdatedEvent RoomInfoUpdated;
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public event StreamStartedEvent StreamStarted;
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public event ReceivedDanmakuEvt ReceivedDanmaku;
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public StreamMonitor(int roomid, Func<TcpClient> funcTcpClient, ConfigV1 config)
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{
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this.funcTcpClient = funcTcpClient;
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this.config = config;
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Roomid = roomid;
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ReceivedDanmaku += Receiver_ReceivedDanmaku;
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dmTokenSource = new CancellationTokenSource();
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Repeat.Interval(TimeSpan.FromSeconds(30), () =>
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{
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if (dmNetStream != null && dmNetStream.CanWrite)
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{
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try
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{
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SendSocketData(2);
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}
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catch (Exception) { }
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}
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}, dmTokenSource.Token);
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httpTimer = new Timer(config.TimingCheckInterval * 1000)
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{
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Enabled = false,
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AutoReset = true,
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SynchronizingObject = null,
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Site = null
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};
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httpTimer.Elapsed += (sender, e) =>
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{
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try
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{
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Check(TriggerType.HttpApi);
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}
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catch (Exception ex)
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{
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logger.Log(Roomid, LogLevel.Warn, "获取直播间开播状态出错", ex);
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}
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};
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config.PropertyChanged += (sender, e) =>
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{
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if (e.PropertyName.Equals(nameof(config.TimingCheckInterval)))
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{
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httpTimer.Interval = config.TimingCheckInterval * 1000;
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}
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};
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Task.Run(() => ConnectWithRetry());
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}
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private void Receiver_ReceivedDanmaku(object sender, ReceivedDanmakuArgs e)
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{
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switch (e.Danmaku.MsgType)
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{
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case MsgTypeEnum.LiveStart:
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if (IsMonitoring)
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{
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Task.Run(() => StreamStarted?.Invoke(this, new StreamStartedArgs() { type = TriggerType.Danmaku }));
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}
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break;
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case MsgTypeEnum.LiveEnd:
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break;
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default:
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break;
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}
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}
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#region 对外API
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public bool Start()
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{
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if (disposedValue)
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{
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throw new ObjectDisposedException(nameof(StreamMonitor));
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}
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IsMonitoring = true;
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httpTimer.Start();
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Check(TriggerType.HttpApi);
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return true;
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}
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public void Stop()
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{
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if (disposedValue)
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{
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throw new ObjectDisposedException(nameof(StreamMonitor));
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}
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IsMonitoring = false;
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httpTimer.Stop();
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}
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public void Check(TriggerType type, int millisecondsDelay = 0)
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{
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if (disposedValue)
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{
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throw new ObjectDisposedException(nameof(StreamMonitor));
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}
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if (millisecondsDelay < 0)
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{
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throw new ArgumentOutOfRangeException(nameof(millisecondsDelay), "不能小于0");
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}
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Task.Run(async () =>
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{
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await Task.Delay(millisecondsDelay).ConfigureAwait(false);
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if ((await FetchRoomInfoAsync().ConfigureAwait(false)).IsStreaming)
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{
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StreamStarted?.Invoke(this, new StreamStartedArgs() { type = type });
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}
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});
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}
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public async Task<RoomInfo> FetchRoomInfoAsync()
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{
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RoomInfo roomInfo = await BililiveAPI.GetRoomInfoAsync(Roomid).ConfigureAwait(false);
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RoomInfoUpdated?.Invoke(this, new RoomInfoUpdatedArgs { RoomInfo = roomInfo });
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return roomInfo;
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}
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#endregion
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#region 弹幕连接
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private void ConnectWithRetry()
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{
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bool connect_result = false;
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while (!dmTcpConnected && !dmTokenSource.Token.IsCancellationRequested)
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{
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Thread.Sleep((int)Math.Max(config.TimingDanmakuRetry, 0));
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logger.Log(Roomid, LogLevel.Info, "连接弹幕服务器...");
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connect_result = Connect();
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}
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if (connect_result)
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{
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logger.Log(Roomid, LogLevel.Info, "弹幕服务器连接成功");
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}
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}
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private bool Connect()
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{
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if (dmTcpConnected) { return true; }
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try
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{
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dmClient = funcTcpClient();
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dmClient.Connect(DM_SERVER_HOST, DM_SERVER_PORT);
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dmNetStream = dmClient.GetStream();
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dmReceiveMessageLoopThread = new Thread(ReceiveMessageLoop)
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{
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Name = "ReceiveMessageLoop " + Roomid,
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IsBackground = true
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};
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dmReceiveMessageLoopThread.Start();
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SendSocketData(7, "{\"roomid\":" + Roomid + ",\"uid\":0}");
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SendSocketData(2);
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return true;
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}
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catch (Exception ex)
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{
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dmError = ex;
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logger.Log(Roomid, LogLevel.Error, "连接弹幕服务器错误", ex);
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return false;
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}
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}
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private void ReceiveMessageLoop()
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{
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logger.Log(Roomid, LogLevel.Trace, "ReceiveMessageLoop Started");
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try
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{
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var stableBuffer = new byte[16];
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var buffer = new byte[4096];
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while (dmTcpConnected)
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{
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dmNetStream.ReadB(stableBuffer, 0, 16);
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Parse2Protocol(stableBuffer, out DanmakuProtocol protocol);
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if (protocol.PacketLength < 16)
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{
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throw new NotSupportedException("协议失败: (L:" + protocol.PacketLength + ")");
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}
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var payloadlength = protocol.PacketLength - 16;
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if (payloadlength == 0)
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{
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continue;//没有内容了
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}
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if (buffer.Length < payloadlength) // 不够长再申请
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{
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buffer = new byte[payloadlength];
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}
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dmNetStream.ReadB(buffer, 0, payloadlength);
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if (protocol.Version == 2 && protocol.Action == 5) // 处理deflate消息
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{
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// Skip 0x78 0xDA
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using (DeflateStream deflate = new DeflateStream(new MemoryStream(buffer, 2, payloadlength - 2), CompressionMode.Decompress))
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{
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while (deflate.Read(stableBuffer, 0, 16) > 0)
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{
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Parse2Protocol(stableBuffer, out protocol);
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payloadlength = protocol.PacketLength - 16;
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if (payloadlength == 0)
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{
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continue; // 没有内容了
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}
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if (buffer.Length < payloadlength) // 不够长再申请
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{
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buffer = new byte[payloadlength];
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}
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deflate.Read(buffer, 0, payloadlength);
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ProcessDanmaku(protocol.Action, buffer, payloadlength);
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}
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}
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}
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else
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{
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ProcessDanmaku(protocol.Action, buffer, payloadlength);
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}
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void ProcessDanmaku(int action, byte[] local_buffer, int length)
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{
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switch (action)
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{
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case 3:
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// var viewer = BitConverter.ToUInt32(local_buffer.Take(4).Reverse().ToArray(), 0); //观众人数
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break;
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case 5://playerCommand
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var json = Encoding.UTF8.GetString(local_buffer, 0, length);
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try
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{
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ReceivedDanmaku?.Invoke(this, new ReceivedDanmakuArgs() { Danmaku = new DanmakuModel(json) });
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}
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catch (Exception ex)
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{
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logger.Log(Roomid, LogLevel.Warn, "", ex);
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}
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break;
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default:
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break;
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}
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}
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}
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}
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catch (Exception ex)
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{
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dmError = ex;
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// logger.Error(ex);
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logger.Log(Roomid, LogLevel.Debug, "Disconnected");
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dmClient?.Close();
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dmNetStream = null;
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if (!(dmTokenSource?.IsCancellationRequested ?? true))
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{
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logger.Log(Roomid, LogLevel.Warn, "弹幕连接被断开，将尝试重连", ex);
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ConnectWithRetry();
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}
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}
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}
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private void SendSocketData(int action, string body = "")
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{
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const int param = 1;
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const short magic = 16;
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const short ver = 1;
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var playload = Encoding.UTF8.GetBytes(body);
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var buffer = new byte[(playload.Length + 16)];
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using (var ms = new MemoryStream(buffer))
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{
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var b = BitConverter.GetBytes(buffer.Length).ToBE();
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ms.Write(b, 0, 4);
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b = BitConverter.GetBytes(magic).ToBE();
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ms.Write(b, 0, 2);
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b = BitConverter.GetBytes(ver).ToBE();
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ms.Write(b, 0, 2);
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b = BitConverter.GetBytes(action).ToBE();
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ms.Write(b, 0, 4);
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b = BitConverter.GetBytes(param).ToBE();
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ms.Write(b, 0, 4);
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if (playload.Length > 0)
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{
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ms.Write(playload, 0, playload.Length);
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}
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dmNetStream.Write(buffer, 0, buffer.Length);
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dmNetStream.Flush();
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}
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}
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private static unsafe void Parse2Protocol(byte[] buffer, out DanmakuProtocol protocol)
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{
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fixed (byte* ptr = buffer)
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{
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protocol = *(DanmakuProtocol*)ptr;
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}
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protocol.ChangeEndian();
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}
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private struct DanmakuProtocol
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{
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/// <summary>
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/// 消息总长度 (协议头 + 数据长度)
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/// </summary>
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public int PacketLength;
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/// <summary>
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/// 消息头长度 (固定为16[sizeof(DanmakuProtocol)])
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/// </summary>
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public short HeaderLength;
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/// <summary>
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/// 消息版本号
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/// </summary>
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public short Version;
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/// <summary>
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/// 消息类型
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/// </summary>
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public int Action;
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/// <summary>
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/// 参数, 固定为1
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/// </summary>
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public int Parameter;
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/// <summary>
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/// 转为本机字节序
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/// </summary>
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public void ChangeEndian()
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{
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PacketLength = IPAddress.HostToNetworkOrder(PacketLength);
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HeaderLength = IPAddress.HostToNetworkOrder(HeaderLength);
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Version = IPAddress.HostToNetworkOrder(Version);
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Action = IPAddress.HostToNetworkOrder(Action);
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Parameter = IPAddress.HostToNetworkOrder(Parameter);
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}
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}
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#endregion
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#region IDisposable Support
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private bool disposedValue = false; // 要检测冗余调用
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protected virtual void Dispose(bool disposing)
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{
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if (!disposedValue)
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{
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if (disposing)
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{
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dmTokenSource?.Cancel();
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dmTokenSource?.Dispose();
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httpTimer?.Dispose();
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dmClient?.Close();
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}
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dmNetStream = null;
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disposedValue = true;
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}
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}
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public void Dispose()
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{
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// 请勿更改此代码。将清理代码放入以上 Dispose(bool disposing) 中。
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Dispose(true);
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}
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#endregion
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}
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}
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