public Task SendRoutingSlip(Itinerary itinerary, object message, Dictionary <string, string> optionalHeaders = null)
{
var logicalMessage = CreateMessage(message, Operation.Send, optionalHeaders);
var destinationAddresses = itinerary.GetDestinationAddresses();
if (!destinationAddresses.Any())
{
throw new ArgumentException($"Cannot send routing slip {message} because the itinerary does not contain any destination addresses. The itinerary must contain at least one destination, otherwise Rebus does not know where to send the message");
}
if (itinerary.MustReturnToSender)
{
var ownAddress = _rebusBus._transport.Address;
if (string.IsNullOrWhiteSpace(ownAddress))
{
throw new InvalidOperationException($"The itinerary if the routing slip {message} says to return it to the sender when done, but the sender appears to be a one-way client (and thus is not capable of receiving anything). When one-way clients send routing slips, they must either send them along their way without specifying a return address, or they must explicitly specify a return address by using the itinerary.ReturnTo(...) method");
}
destinationAddresses.Add(ownAddress);
}
else if (itinerary.HasExplicitlySpecifiedReturnAddress)
{
destinationAddresses.Add(itinerary.GetReturnAddress);
}
var first = destinationAddresses.First();
var rest = destinationAddresses.Skip(1);
var value = string.Join(";", rest);
logicalMessage.Headers[Headers.RoutingSlipItinerary] = value;
logicalMessage.Headers[Headers.RoutingSlipTravelogue] = "";
return(_rebusBus.InnerSend(new[] { first }, logicalMessage));
}
