public void Send(object message, IDictionary<string, string> headers)
{
// create an envelope for the message
Envelope newEnvelope = new Envelope();
newEnvelope.Headers = headers ?? new Dictionary<string, string>();
// create a message context for message processing
MessageContext ctx = new MessageContext(
MessageContext.Directions.Out, newEnvelope, message);
// process the message
this.ProcessMessage(ctx, () =>
{
try
{
_envelopeSender.Send(ctx.Envelope);
}
catch (Exception ex)
{
string msg = "Failed to send an envelope.";
Log.Error(msg, ex);
throw new MessageException(msg, ex);
}
});
}
public void ProcessMessage(
MessageContext context,
Action continueProcessing)
{
Log.Debug(string.Format("Enter ProcessMessage - Direction: {0}", context.Direction));
ProcessMessage(context, _processingChain, continueProcessing);
Log.Debug(string.Format("Leave ProcessMessage - Direction: {0}", context.Direction));
}
public void ProcessMessage(MessageContext context, Action continueProcessing)
{
string endOfStreamTopic = typeof(EndOfStream).FullName;
string collectionSizeTopic = typeof(CollectionSizeNotifier).FullName;
if (context.Direction == MessageContext.Directions.Out)
{
if (context.Envelope.GetMessageTopic() == endOfStreamTopic)
{
context.Envelope.SetMessageTopic(((EndOfStream)context.Message).StreamType);
}
if (context.Envelope.GetMessageTopic() == collectionSizeTopic)
{
context.Envelope.SetMessageTopic(((CollectionSizeNotifier)context.Message).CollectionType);
}
}
continueProcessing();
}
public void Publish(object evt)
{
_log.Debug("enter publish to stream");
string sequence = _sequenceId.ToString();
Envelope env = StreamingEnvelopeHelper.BuildStreamingEnvelope(sequence, _position);
env.SetMessageTopic(Topic);
MessageContext context = new MessageContext(MessageContext.Directions.Out, env, evt);
EventStreamQueueItem eventItem = new EventStreamQueueItem(context);
_log.Debug("buffering event with sequenceId: " + sequence + ", position: " + _position);
_queuedEvents.Enqueue(eventItem);
if (_queuedEvents.Count == (_batchLimit)) {
_log.Debug("flushing " + _batchLimit + " event(s) to stream.");
FlushStreamBuffer();
}
_position++;
}
public void ProcessInbound(MessageContext context, Action continueProcessing)
{
bool signatureVerified = false;
Envelope env = context.Envelope;
// start by getting the purported sender's identity
string sender = env.GetSenderIdentity();
if (string.IsNullOrEmpty(sender))
{
_log.Error("An inbound event arrived with no sender identity");
}
else
{
// use the identity to lookup their certificate
X509Certificate2 senderCert = _certProvider.GetCertificateFor(sender);
if (null == senderCert)
{
_log.Error("Sender " + sender + " does not have a public key certificate available");
}
else
{
// get the digital signature from the headers
byte[] digitalSignature = env.GetDigitalSignature();
if (0 == digitalSignature.LongLength)
{
_log.Error("Sender " + sender + " did not digitally sign the event");
}
else
{
// verify that the payload hasn't been tampered with by using the
// sender's public key and the digital signature on the envelope
RSACryptoServiceProvider rsaProvider = senderCert.PublicKey.Key as RSACryptoServiceProvider;
signatureVerified = rsaProvider.VerifyData(env.Payload, new SHA1CryptoServiceProvider(), digitalSignature);
}
}
}
if (signatureVerified) { continueProcessing(); }
}
public void ProcessMessage(
MessageContext context,
List<IMessageProcessor> processingChain,
Action continueProcessing)
{
// if the chain is null or empty, complete processing
if ((null == processingChain) || (!processingChain.Any()))
{
Log.Debug(string.Format("Message processing complete. Direction: {0}", context.Direction));
continueProcessing();
return;
}
// get the first processor
IMessageProcessor processor = processingChain.First();
// create a processing chain that no longer contains this processor
List<IMessageProcessor> newChain = processingChain.Skip(1).ToList();
// let it process the message and pass its "next" processor: a method that
// recursively calls this function with the current processor removed
Log.Debug(string.Format("Handing message to processor: {0} - Direction: {1}", processor.GetType(), context.Direction));
processor.ProcessMessage(context, () => ProcessMessage(context, newChain, continueProcessing));
}
public void ProcessMessage(MessageContext context, Action continueProcessing)
{
if (MessageContext.Directions.In == context.Direction)
{
this.ProcessInbound(context, continueProcessing);
}
if (MessageContext.Directions.Out == context.Direction)
{
this.ProcessOutbound(context, continueProcessing);
}
}
public void ProcessOutbound(MessageContext context, Action continueProcessing)
{
if (null == _cert) { return; }
Envelope env = context.Envelope;
env.SetSenderIdentity(_cert.Subject);
try
{
RSACryptoServiceProvider rsaProvider = _cert.PrivateKey as RSACryptoServiceProvider;
env.SetDigitalSignature(rsaProvider.SignData(env.Payload, new SHA1CryptoServiceProvider()));
continueProcessing();
}
catch (Exception ex)
{
_log.Error("Failed to digitally sign the event", ex);
throw;
}
}
public void ProcessMessage(
MessageContext context,
Action onComplete)
{
_messageProcessor.ProcessMessage(context, onComplete);
}
public EventStreamQueueItem(MessageContext eventContext)
{
_eventContext = eventContext;
}
public void ProcessMessage(MessageContext context, Action continueProcessing)
{
if (MessageContext.Directions.Out == context.Direction)
{
Envelope env = context.Envelope;
Guid messageId = env.GetMessageId();
messageId = Guid.Equals(Guid.Empty, messageId) ? Guid.NewGuid() : messageId;
env.SetMessageId(messageId.ToString());
Guid correlationId = env.GetCorrelationId();
string messageType = env.GetMessageType();
messageType = string.IsNullOrEmpty(messageType) ? this.GetMessageType(context.Message) : messageType;
env.SetMessageType(messageType);
string messageTopic = env.GetMessageTopic();
messageTopic = string.IsNullOrEmpty(messageTopic) ? this.GetMessageTopic(context.Message) : messageTopic;
if (Guid.Empty != correlationId)
{
messageTopic = messageTopic + "#" + correlationId.ToString();
}
env.SetMessageTopic(messageTopic);
DateTime creation = env.GetCreationTime();
creation = (DateTime.MinValue == creation) ? DateTime.UtcNow : creation;
env.SetCreationTime(creation);
string senderIdentity = env.GetSenderIdentity();
if (string.IsNullOrEmpty(senderIdentity))
{
if (!string.IsNullOrEmpty(_alternateIdentity))
{
senderIdentity = _alternateIdentity;
}
else
{
//This line will raise an exception if there is no active directory server available
try
{
senderIdentity = UserPrincipal.Current.DistinguishedName.Replace(",", ", ");
}
catch
{
senderIdentity = UserPrincipal.Current.Name;
}
}
env.SetSenderIdentity(senderIdentity);
}
}
// either way, continue processing
continueProcessing();
}
public virtual void ProcessInbound(MessageContext context, Action continueProcessing)
{
bool success = false;
Envelope env = context.Envelope;
try
{
// get the type from the headers on the envelope
string eventType = env.GetMessageType();
// if no type, try the topic
if (string.IsNullOrEmpty(eventType))
{
eventType = env.GetMessageTopic();
}
// and make sure we get something
if (string.IsNullOrEmpty(eventType))
{
throw new Exception("Cannot deserialize an envelope that does not specify the event's topic");
}
// start with a null Type
Type type = null;
// go through each assembly loaded into the app domain
StringBuilder assembliesLoaded = new StringBuilder();
foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
{
assembliesLoaded.AppendLine("Loaded Assembly Found: " + assembly.FullName);
// and see if it can get us our Type
type = assembly.GetType(eventType);
if (null != type)
{
_log.Debug("Found type " + type + " in assembly " + assembly.FullName);
break;
}
}
_log.Debug("Currently Loaded Assemblies:" + "\r\n" + assembliesLoaded.ToString());
if (null != type) // if we did get a Type, we can deserialize the event
{
string jsonString = new UTF8Encoding().GetString(env.Payload); //Encoding.UTF8.GetString(env.Payload);
_log.Debug("Will attempt to deserialize: " + jsonString);
context.Message = JsonConvert.DeserializeObject(jsonString, type, _settings);
success = true;
}
else // otherwise, throw an exception
{
throw new Exception("Cannot deserialize an event of topic '" + eventType + "' because no type definition could be found for it");
}
}
catch (Exception ex)
{
_log.Error("Failed to deserialize an event", ex);
}
if (success) { continueProcessing(); }
}
public virtual void ProcessOutbound(MessageContext context, Action continueProcessing)
{
object ev = context.Message;
try
{
// first, serialize the event (make it pretty!)
string json = JsonConvert.SerializeObject(ev, Formatting.Indented, _settings);
_log.Debug("Serialized event: " + json);
// next, convert the string into bytes using UTF-8
context.Envelope.Payload = new UTF8Encoding().GetBytes(json);
}
catch (Exception ex)
{
_log.Error("Failed to serialize an event", ex);
throw;
}
continueProcessing();
}
public virtual void ProcessInbound(MessageContext context, Action continueProcessing)
{
bool success = false;
Envelope env = context.Envelope;
try
{
// get the type from the headers on the envelope
string eventType = env.GetMessageType();
// if no type, try the topic
if (string.IsNullOrEmpty(eventType))
{
eventType = env.GetMessageTopic();
}
// and make sure we get something
if (string.IsNullOrEmpty(eventType))
{
throw new Exception("Cannot deserialize an envelope that does not specify the event's topic");
}
// start with a null Type
Type type = null;
// go through each assembly loaded into the app domain
StringBuilder assembliesLoaded = new StringBuilder();
foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
{
assembliesLoaded.AppendLine("Loaded Assembly Found: " + assembly.FullName);
// and see if it can get us our Type
type = assembly.GetType(eventType);
if (null != type)
{
_log.Debug("Found type " + type + " in assembly " + assembly.FullName);
break;
}
}
_log.Debug("Currently Loaded Assemblies:" + "\r\n" + assembliesLoaded.ToString());
if (null != type) // if we did get a Type, we can deserialize the event
{
string jsonString = new UTF8Encoding().GetString(env.Payload); //Encoding.UTF8.GetString(env.Payload);
_log.Debug("Will attempt to deserialize: " + jsonString);
context.Message = JsonConvert.DeserializeObject(jsonString, type, _settings);
success = true;
}
else // otherwise, throw an exception
{
throw new Exception("Cannot deserialize an event of topic '" + eventType + "' because no type definition could be found for it");
}
}
catch (Exception ex)
{
_log.Error("Failed to deserialize an event", ex);
}
if (success)
{
continueProcessing();
}
}
public void ProcessMessage(
MessageContext context,
Action onComplete)
{
_messageProcessor.ProcessMessage(context, onComplete);
}
