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According to the spec: http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0-20080424.pdf device responses to search should be delayed a random duration between 0 and the delay, not equal to the delay.

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This commit is contained in:
Mike 2015-01-27 19:46:16 -05:00
parent 782fe92cf7
commit 5f557b7c73
1 changed files with 29 additions and 12 deletions
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41
MediaBrowser.Dlna/Ssdp/SsdpHandler.cs
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@ -62,20 +62,14 @@ namespace MediaBrowser.Dlna.Ssdp
{
if (string.Equals(args.Method, "M-SEARCH", StringComparison.OrdinalIgnoreCase))
{
string mx = null;
args.Headers.TryGetValue("mx", out mx);
int delaySeconds;
if (!string.IsNullOrWhiteSpace(mx) &&
int.TryParse(mx, NumberStyles.Any, CultureInfo.InvariantCulture, out delaySeconds)
&& delaySeconds > 0)
TimeSpan delay = GetSearchDelay(args.Headers);
if (_config.GetDlnaConfiguration().EnableDebugLogging)
{
if (_config.GetDlnaConfiguration().EnableDebugLogging)
{
_logger.Debug("Delaying search response by {0} seconds", delaySeconds);
}
await Task.Delay(delaySeconds * 1000).ConfigureAwait(false);
_logger.Debug("Delaying search response by {0} seconds", delay.TotalSeconds);
}
await Task.Delay(delay).ConfigureAwait(false);
RespondToSearch(args.EndPoint, args.Headers["st"]);
}
@ -148,6 +142,29 @@ namespace MediaBrowser.Dlna.Ssdp
StartQueueTimer();
}
/// <summary>
/// According to the spec: http://www.upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.0-20080424.pdf
/// Device responses should be delayed a random duration between 0 and this many seconds to balance
/// load for the control point when it processes responses. In my testing kodi times out after mx
/// so we will generate from mx - 1
/// </summary>
/// <param name="headers">The mx headers</param>
/// <returns>A timepsan for the amount to delay before returning search result.</returns>
private TimeSpan GetSearchDelay(Dictionary<string, string> headers)
{
string mx;
headers.TryGetValue("mx", out mx);
int delaySeconds = 0;
if (!string.IsNullOrWhiteSpace(mx)
&& int.TryParse(mx, NumberStyles.Any, CultureInfo.InvariantCulture, out delaySeconds)
&& delaySeconds > 1)
{
delaySeconds = new Random().Next(delaySeconds - 1);
}
return TimeSpan.FromSeconds(delaySeconds);
}
private void RespondToSearch(EndPoint endpoint, string deviceType)
{
if (_config.GetDlnaConfiguration().EnableDebugLogging)