private async ValueTask OnOffer(int channelId, Memory <byte> payloadBuffer, CancellationToken cancellationToken)
{
await ReadToFillAsync(this.stream, payloadBuffer, throwOnEmpty : true, cancellationToken).ConfigureAwait(false);
string name = DecodeString(payloadBuffer);
var channel = new Channel(this, channelId, name, channelOptions: DefaultChannelOptions);
bool acceptingChannelAlreadyPresent = false;
ChannelOptions options = null;
lock (this.syncObject)
{
if (name != null && this.acceptingChannels.TryGetValue(name, out var acceptingChannels))
{
while (acceptingChannels.Count > 0)
{
var candidate = acceptingChannels.Dequeue();
if (candidate.TrySetResult(channel))
{
if (this.TraceSource.Switch.ShouldTrace(TraceEventType.Information))
{
this.TraceSource.TraceEvent(TraceEventType.Information, (int)TraceEventId.ChannelOfferReceived, "Remote party offers channel {1} \"{0}\" which matches up with a pending " + nameof(this.AcceptChannelAsync), name, channelId);
}
acceptingChannelAlreadyPresent = true;
options = (ChannelOptions)candidate.Task.AsyncState;
break;
}
}
}
if (!acceptingChannelAlreadyPresent)
{
if (name != null)
{
if (this.TraceSource.Switch.ShouldTrace(TraceEventType.Information))
{
this.TraceSource.TraceEvent(TraceEventType.Information, (int)TraceEventId.ChannelOfferReceived, "Remote party offers channel {1} \"{0}\" which has no pending " + nameof(this.AcceptChannelAsync), name, channelId);
}
if (!this.channelsOfferedByThemByName.TryGetValue(name, out var offeredChannels))
{
this.channelsOfferedByThemByName.Add(name, offeredChannels = new Queue <Channel>());
}
offeredChannels.Enqueue(channel);
}
else
{
if (this.TraceSource.Switch.ShouldTrace(TraceEventType.Information))
{
this.TraceSource.TraceEvent(TraceEventType.Information, (int)TraceEventId.ChannelOfferReceived, "Remote party offers anonymous channel {0}", channelId);
}
}
}
this.openChannels.Add(channelId, channel);
}
if (acceptingChannelAlreadyPresent)
{
this.AcceptChannelOrThrow(channel, options);
}
var args = new ChannelOfferEventArgs(channel.Id, channel.Name, acceptingChannelAlreadyPresent);
this.OnChannelOffered(args);
}
/// <summary> /// Raises the <see cref="ChannelOffered"/> event. /// </summary> /// <param name="args">The arguments to pass to the event handlers.</param> protected virtual void OnChannelOffered(ChannelOfferEventArgs args) => this.ChannelOffered?.Invoke(this, args);