public bool Send(Message message)
{
return Send(_writer =>
{
Reporter.Output.WriteLine($"OnSend ({message})");
_writer.Write(JsonConvert.SerializeObject(message));
});
}
public bool Send(Message message)
{
return Send(_writer =>
{
_log.LogInformation($"Send ({message})");
_writer.Write(JsonConvert.SerializeObject(message));
});
}
public void Negotiate(Message message)
{
if (!IsProtocolNegotiation(message))
{
return;
}
Reporter.Output.WriteLine("Initializing the protocol negotiation.");
if (EnvironmentOverridden)
{
Reporter.Output.WriteLine($"DTH protocol negotiation is override by environment variable {EnvDthProtocol} and set to {CurrentVersion}.");
return;
}
var tokenValue = message.Payload?["Version"];
if (tokenValue == null)
{
Reporter.Output.WriteLine("Protocol negotiation failed. Version property is missing in payload.");
return;
}
var preferredVersion = tokenValue.ToObject<int>();
if (preferredVersion == 0)
{
// the preferred version can't be zero. either property is missing or the the payload is corrupted.
Reporter.Output.WriteLine("Protocol negotiation failed. Protocol version 0 is invalid.");
return;
}
CurrentVersion = Math.Min(preferredVersion, MaxVersion);
Reporter.Output.WriteLine($"Protocol negotiation successed. Use protocol {CurrentVersion}");
if (message.Sender != null)
{
Reporter.Output.WriteLine("Respond to protocol negotiation.");
message.Sender.Transmit(Message.FromPayload(
MessageTypes.ProtocolVersion,
0,
new { Version = CurrentVersion }));
}
else
{
Reporter.Output.WriteLine($"{nameof(Message.Sender)} is null.");
}
}
public bool IsProtocolNegotiation(Message message)
{
return message?.MessageType == MessageTypes.ProtocolVersion;
}
public bool Transmit(Message message)
{
message.HostId = _hostName;
return _queue.Send(message);
}