/// <summary>
/// 根据输入参数更新 Peer 的状态。
/// </summary>
/// <param name="inputParameters">BT 客户端请求 Tracker 服务器时传递的参数。</param>
public void UpdateStatus(AnnounceInputParameters inputParameters)
{
var now = DateTime.Now;
var elapsedTime = (now - LastRequestTrackerTime).TotalSeconds;
if (elapsedTime < 1)
{
elapsedTime = 1;
}
ClientAddress = inputParameters.ClientAddress;
// 通过差值除以消耗的时间，得到每秒的大概下载速度。
DownloadSpeed = (int)((inputParameters.Downloaded - DownLoaded) / elapsedTime);
DownLoaded = inputParameters.Downloaded;
UploadSpeed = (int)((inputParameters.Uploaded) / elapsedTime);
Uploaded = inputParameters.Uploaded;
Left = inputParameters.Left;
PeerId = inputParameters.PeerId;
LastRequestTrackerTime = now;
// 如果没有剩余数据，则表示 Peer 已经完成下载。
if (Left == 0)
{
IsCompleted = true;
}
}
public Peer(AnnounceInputParameters inputParameters)
{
UniqueId = inputParameters.PeerId;
// 根据输入参数更新 Peer 的状态。
UpdateStatus(inputParameters);
}
/// <summary>
/// 检测参数与种子唯一标识的状态。
/// </summary>
private void CheckParameters(string infoHash, AnnounceInputParameters inputParameters)
{
if (string.IsNullOrEmpty(infoHash))
{
throw new Exception("种子的唯一标识不能为空。");
}
if (inputParameters == null)
{
throw new Exception("BT 客户端传入的参数不能为空。");
}
}
public void DeletePeer(string infoHash, AnnounceInputParameters inputParameters)
{
CheckParameters(infoHash, inputParameters);
if (!_peers.ContainsKey(infoHash))
{
return;
}
_peers[infoHash].RemoveAll(p => p.UniqueId == inputParameters.PeerId);
UpdateBitTorrentStatus(infoHash);
}
public Peer AddPeer(string infoHash, AnnounceInputParameters inputParameters)
{
CheckParameters(infoHash, inputParameters);
var newPeer = new Peer(inputParameters);
if (!_peers.ContainsKey(infoHash))
{
_peers.TryAdd(infoHash, new List <Peer> {
newPeer
});
}
_peers[infoHash].Add(newPeer);
UpdateBitTorrentStatus(infoHash);
return(newPeer);
}
public void UpdatePeer(string infoHash, AnnounceInputParameters inputParameters)
{
CheckParameters(infoHash, inputParameters);
if (!_peers.ContainsKey(inputParameters.InfoHash))
{
_peers.TryAdd(infoHash, new List <Peer>());
}
if (!_bitTorrentStatus.ContainsKey(inputParameters.InfoHash))
{
_bitTorrentStatus.TryAdd(infoHash, new BitTorrentStatus());
}
// 如果 Peer 不存在则添加，否则更新其状态。
var peers = _peers[infoHash];
var peer = peers.FirstOrDefault(p => p.UniqueId == inputParameters.PeerId);
if (peer == null)
{
AddPeer(infoHash, inputParameters);
}
else
{
peer.UpdateStatus(inputParameters);
}
// 根据事件更新种子状态与 Peer 信息。
if (inputParameters.Event == TorrentEvent.Stopped)
{
DeletePeer(infoHash, inputParameters);
}
if (inputParameters.Event == TorrentEvent.Completed)
{
_bitTorrentStatus[infoHash].Downloaded++;
}
UpdateBitTorrentStatus(infoHash);
}
