/// <summary>
/// Tests if incoming satisfies listening params - message id, device id and address
/// </summary>
/// <typeparam name="T">Type of message object</typeparam>
/// <param name="message">Incoming SOAP message</param>
/// <returns>true, if incoming satisfies listening params</returns>
protected bool IsExpectedMessage <T>(SoapMessage <T> message)
where T : class
{
if (!IsExpectedMessageHeader(message.Header))
{
return(false);
}
if (!string.IsNullOrEmpty(_listenDevice))
{
string deviceId = string.Empty;
if (message.Object is WSD.ProbeMatchesType)
{
deviceId = DiscoveryUtils.GetDeviceId(message.Object as WSD.ProbeMatchesType);
}
else if (message.Object is WSD.HelloType)
{
deviceId = DiscoveryUtils.GetDeviceId(message.Object as WSD.HelloType);
}
else if (message.Object is WSD.ByeType)
{
deviceId = DiscoveryUtils.GetDeviceId(message.Object as WSD.ByeType);
}
if (_listenDevice != deviceId)
{
return(false);
}
}
return(true);
}
/// <summary>
/// Sends multicast or unicast probe message and begins listening for answer from specified address and device
/// </summary>
/// <param name="multicast">if true, multicast message will be sent</param>
/// <param name="address">Address to listen</param>
/// <param name="deviceId">Device to listen</param>
/// <param name="timeout">>Time to listen</param>
/// <param name="scopes">Scopes to probe</param>
/// <param name="matchRule">Scope matching rule</param>
public void Probe(bool multicast, IPAddress address, string deviceId, int timeout, DiscoveryUtils.DiscoveryType[][] types, string[] scopes, string matchRule)
{
_socket = new DiscoverySocket(_endPointLocal);
_socket.MessageReceived += OnMessageReceived <WSD.ProbeMatchesType>;
System.Diagnostics.Debug.WriteLine(string.Format("New socket [{0}]", _socket.GetHashCode()));
string messageId = string.Empty;
try
{
if (multicast)
{
JoinDiscoveryMutlicastGroup(_socket);
}
IPEndPoint target = multicast
? new IPEndPoint(GetDiscoveryMulticastAddress(), WS_DISCOVER_PORT)
: new IPEndPoint(address, WS_DISCOVER_PORT);
List <byte[]> messages = new List <byte[]>();
List <string> messageIds = new List <string>();
if (types != null)
{
foreach (DiscoveryUtils.DiscoveryType[] typesSet in types)
{
byte[] message = BuildProbeMessage(typesSet, scopes, matchRule);
messageIds.Add(DiscoveryUtils.ExtractMessageId(message));
messages.Add(_processMessageMethod != null ? _processMessageMethod(message) : message);
}
}
else
{
byte[] message = BuildProbeMessage(null, scopes, matchRule);
messageIds.Add(DiscoveryUtils.ExtractMessageId(message));
messages.Add(_processMessageMethod != null ? _processMessageMethod(message) : message);
}
messages.Reverse();
_socket.Send(target, messages);
StartListen(timeout, address, deviceId, messageIds.ToArray(), true);
foreach (byte[] message in messages)
{
if (MessageSent != null)
{
string dump = Encoding.UTF8.GetString(message);
MessageSent(this, new MessageEventArgs()
{
Message = dump
});
}
}
}
catch (Exception exc)
{
_socket.Close();
throw;
}
}
/// <summary>
/// Sends multicast or unicast probe message and begins listening for answer from specified address and device
/// </summary>
/// <param name="multicast">if true, multicast message will be sent</param>
/// <param name="address">Address to listen</param>
/// <param name="deviceId">Device to listen</param>
/// <param name="timeout">>Time to listen</param>
/// <param name="scopes">Scopes to probe</param>
/// <param name="matchRule">Scope matching rule</param>
public void Probe(bool multicast, IPAddress address, string deviceId, int timeout, string[] scopes, string matchRule)
{
_socket = new DiscoverySocket(_endPointLocal);
_socket.MessageReceived += OnMessageReceived <WSD.ProbeMatchesType>;
string messageId = string.Empty;
try
{
if (multicast)
{
JoinDiscoveryMutlicastGroup(_socket);
}
byte[] message = BuildProbeMessage(scopes, matchRule);
messageId = DiscoveryUtils.ExtractMessageId(message);
IPEndPoint target = multicast ? new IPEndPoint(GetDiscoveryMulticastAddress(), WS_DISCOVER_PORT) :
new IPEndPoint(address, WS_DISCOVER_PORT);
_socket.Send(target, message);
StartListen(timeout, address, deviceId, messageId);
}
catch
{
_socket.Close();
throw;
}
}
/// <summary>
/// Tests if incoming message header has proper RelatedTo element
/// </summary>
/// <param name="header">Incoming SOAP message header</param>
/// <returns>true, if incoming message header has proper RelatedTo element</returns>
protected bool IsExpectedMessageHeader(ICollection <XmlElement> header)
{
if (!string.IsNullOrEmpty(_listenMessage))
{
string relatedTo = DiscoveryUtils.ExtractRelatesTo(header);
if (!DiscoveryUtils.CompareUUID(_listenMessage, relatedTo))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Tests if incoming message header has proper RelatedTo element
/// </summary>
/// <param name="header">Incoming SOAP message header</param>
/// <returns>true, if incoming message header has proper RelatedTo element</returns>
protected bool IsExpectedMessageHeader(ICollection <XmlElement> header)
{
if (_listenMessages.Count() > 0)
{
string relatedTo = DiscoveryUtils.ExtractRelatesTo(header);
foreach (string listenMessage in _listenMessages)
{
if (DiscoveryUtils.CompareUUID(listenMessage, relatedTo))
{
return(true);
}
}
return(false);
}
return(true);
}
/// <summary>
/// Parse UDP packet
/// </summary>
/// <typeparam name="T">Type of expected object</typeparam>
/// <param name="e">Event arguments, containing endpoint address and incoming bytes</param>
/// <param name="action">Post-processing action</param>
protected void ProcessIncomingPacket <T>(DiscoverySocketEventArgs e, Action action)
where T : class
{
if ((_listenAddress == null) || DiscoveryUtils.CompareAddresses(e.Source.Address, _listenAddress))
{
try
{
//try to parse message according to expected type
SoapMessage <T> message = DiscoverySoapBuilder.ParseMessage <T>(e.Message, _discoverySchemas);
if (IsExpectedMessage <T>(message))
{
EventHandler <DiscoveryMessageEventArgs> handler = GetHandler(message.Object.GetType());
DiscoveryMessageEventArgs args = new DiscoveryMessageEventArgs(
message.ToSoapMessage <object>(),
e.Source.Address);
if (handler != null)
{
handler(this, args);
}
action();
}
}
catch (SoapFaultException ex)
{
if (ex.Message != null)
{
if (IsExpectedMessage <Fault>(ex.FaultMessage))
{
if (SoapFaultReceived != null)
{
SoapFaultReceived(this, new DiscoveryErrorEventArgs(ex, ex.Fault));
}
action();
}
}
}
catch (UnxpectedElementException ex)
{
if ((_listenMessages.Count() > 0) && IsExpectedMessageHeader(ex.Headers))
{
//throw this exception only is message contains proper RelatedTo, otherwise just ignore message
if (ReceiveError != null)
{
ReceiveError(this, new DiscoveryErrorEventArgs(ex, null));
}
action();
throw;
}
}
catch (Exception ex)
{
if (ReceiveError != null)
{
ReceiveError(this, new DiscoveryErrorEventArgs(ex, null));
}
System.Diagnostics.Trace.WriteLine(string.Format("Discovery::OnMessageReceived error [{0}]",
ex.Message));
System.Diagnostics.Trace.Flush();
}
}
}
