public override void Stop()
{
base.Stop();
// Shutdown currently open streaming connections.
lock (_currentStreamingRequests.SyncRoot) {
foreach (DictionaryEntry entry in _currentStreamingRequests)
{
EndpointPushNotifier notifier = entry.Value as EndpointPushNotifier;
notifier.Close();
}
_currentStreamingRequests = null;
}
}
private void HandleFlexClientStreamingOpenRequest(HttpRequest request, HttpResponse response, IClient flexClient)
{
Session session = FluorineContext.Current.Session as Session;
if (session == null)
{
string msg = string.Format("Cannot grant streaming connection when ASP.NET session state is disabled", this.Id);
if (log.IsWarnEnabled)
{
log.Warn(msg);
}
try {
HandleBadRequest(msg, HttpContext.Current.Response);
} catch (HttpException) { }
return;
}
if (!_canStream || !session.CanStream)
{
string msg = string.Format("Cannot grant streaming connection, limit has been reached", this.Id);
try {
HandleBadRequest(msg, HttpContext.Current.Response);
} catch (HttpException) { }
return;
}
bool canStream = false;
lock (this.SyncRoot) {
_streamingClientsCount.Increment();
if (_streamingClientsCount.Value == this.MaxStreamingClients)
{
canStream = true; // This thread got the last spot.
_canStream = false;
}
else if (_streamingClientsCount.Value > this.MaxStreamingClients)
{
canStream = false; // This thread lost the last spot.
_streamingClientsCount.Decrement(); // We're not going to grant the streaming right to the client.
}
else
{
// Allow this thread to stream.
canStream = true;
}
}
if (!canStream)
{
string msg = string.Format("Cannot service streaming request, max-streaming-clients reached in endpoint {0}", this.Id);
try {
HandleBadRequest(msg, HttpContext.Current.Response);
} catch (HttpException) { }
return;
}
UserAgent userAgent = this.ChannelDefinition.Properties.UserAgentSettings[request.Browser.Browser];
if (userAgent != null)
{
lock (session.SyncRoot) {
session.MaxConnectionsPerSession = userAgent.MaxStreamingConnectionsPerSession;
}
}
lock (session.SyncRoot) {
session.StreamingConnectionsCount++;
if (session.StreamingConnectionsCount == session.MaxConnectionsPerSession)
{
canStream = true; // This thread got the last spot in the session.
session.CanStream = false;
}
else if (session.StreamingConnectionsCount > session.MaxConnectionsPerSession)
{
canStream = false;
session.StreamingConnectionsCount--;
_streamingClientsCount.Decrement();
}
else
{
canStream = true;
}
}
if (!canStream)
{
string msg = string.Format("Cannot grant streaming connection, limit has been reached", this.Id);
try {
HandleBadRequest(msg, HttpContext.Current.Response);
} catch (HttpException) { }
return;
}
EndpointPushNotifier notifier = null;
try {
response.ContentType = ContentType.AMF;
response.AppendHeader("Cache-Control", "no-cache");
response.AppendHeader("Pragma", "no-cache");
response.AppendHeader("Connection", "close");
//response.AppendHeader("Transfer-Encoding", "chunked");
response.Flush();
// Setup for specific user agents.
byte[] kickStartBytesToStream = null;
int kickStartBytes = userAgent != null ? userAgent.KickstartBytes : 0;
if (kickStartBytes > 0)
{
// The minimum number of actual bytes that need to be sent to kickstart, taking into account transfer-encoding overhead.
try {
int chunkLengthHeaderSize = System.Text.Encoding.ASCII.GetBytes(System.Convert.ToString(kickStartBytes, 0x10)).Length; //System.Text.ASCIIEncoding.ASCII.GetBytes(kickStartBytes.ToString("X")).Length;
int chunkOverhead = chunkLengthHeaderSize + 4; // 4 for the 2 wrapping CRLF tokens.
int minimumKickstartBytes = kickStartBytes - chunkOverhead;
kickStartBytesToStream = new byte[(minimumKickstartBytes > 0) ? minimumKickstartBytes : kickStartBytes];
} catch {
kickStartBytesToStream = new byte[kickStartBytes];
}
}
if (kickStartBytesToStream != null)
{
StreamChunk(kickStartBytesToStream, response);
}
try {
notifier = new EndpointPushNotifier(this, flexClient);
lock (_currentStreamingRequests.SyncRoot) {
_currentStreamingRequests.Add(notifier.Id, notifier);
}
// Push down an acknowledgement for the 'connect' request containing the unique id for this specific stream.
AcknowledgeMessage connectAck = new AcknowledgeMessage();
connectAck.body = notifier.Id;
connectAck.correlationId = OpenCommand;
StreamMessage(connectAck, response);
} catch (MessageException) {
}
if (log.IsDebugEnabled)
{
string msg = string.Format("Start streaming for endpoint with id {0} and client with id {1}", this.Id, flexClient.Id);
log.Debug(msg);
}
int serverToClientHeartbeatMillis = this.ChannelDefinition.Properties.ServerToClientHeartbeatMillis >= 0 ? this.ChannelDefinition.Properties.ServerToClientHeartbeatMillis : 0;
serverToClientHeartbeatMillis = 100;
while (!notifier.IsClosed)
{
IList messages = notifier.GetPendingMessages();
StreamMessages(messages, response);
lock (notifier.SyncRoot) {
Monitor.Wait(notifier.SyncRoot, serverToClientHeartbeatMillis);
messages = notifier.GetPendingMessages();
// If there are no messages to send to the client, send a 0
// byte as a heartbeat to make sure the client is still valid.
if ((messages == null || messages.Count == 0) && serverToClientHeartbeatMillis > 0)
{
try {
StreamChunk(Heartbeat, response);
response.Flush();
} catch (HttpException) {
break;
} catch (IOException) {
break;
}
}
else
{
StreamMessages(messages, response);
}
}
}
// Terminate the response.
StreamChunk(null, response);
if (log.IsDebugEnabled)
{
string msg = string.Format("Releasing streaming connection for endpoint with id {0} and and client with id {1}", this.Id, flexClient.Id);
log.Debug(msg);
}
} catch (IOException ex) //HttpException?
{
if (log.IsWarnEnabled)
{
log.Warn("Streaming thread for endpoint with id " + this.Id + " is closing connection due to an IO error.", ex);
}
} catch (Exception ex) {
if (log.IsErrorEnabled)
{
log.Error("Streaming thread for endpoint with id " + this.Id + " is closing connection due to an error.", ex);
}
} finally {
if (notifier != null && _currentStreamingRequests != null)
{
if (_currentStreamingRequests != null)
{
lock (_currentStreamingRequests.SyncRoot) {
_currentStreamingRequests.Remove(notifier.Id);
}
}
notifier.Close();
}
_streamingClientsCount.Decrement();
lock (session.SyncRoot) {
session.StreamingConnectionsCount--;
session.CanStream = session.StreamingConnectionsCount < session.MaxConnectionsPerSession;
}
}
}
private void HandleFlexClientStreamingOpenRequest(HttpRequest request, HttpResponse response, IClient flexClient) {
Session session = FluorineContext.Current.Session as Session;
if (session == null) {
string msg = string.Format("Cannot grant streaming connection when ASP.NET session state is disabled", this.Id);
if (log.IsWarnEnabled)
log.Warn(msg);
try {
HandleBadRequest(msg, HttpContext.Current.Response);
} catch (HttpException) { }
return;
}
if (!_canStream || !session.CanStream) {
string msg = string.Format("Cannot grant streaming connection, limit has been reached", this.Id);
try {
HandleBadRequest(msg, HttpContext.Current.Response);
} catch (HttpException) { }
return;
}
bool canStream = false;
lock (this.SyncRoot) {
_streamingClientsCount.Increment();
if (_streamingClientsCount.Value == this.MaxStreamingClients) {
canStream = true; // This thread got the last spot.
_canStream = false;
} else if (_streamingClientsCount.Value > this.MaxStreamingClients) {
canStream = false; // This thread lost the last spot.
_streamingClientsCount.Decrement();// We're not going to grant the streaming right to the client.
} else {
// Allow this thread to stream.
canStream = true;
}
}
if (!canStream) {
string msg = string.Format("Cannot service streaming request, max-streaming-clients reached in endpoint {0}", this.Id);
try {
HandleBadRequest(msg, HttpContext.Current.Response);
} catch (HttpException) { }
return;
}
UserAgent userAgent = this.ChannelDefinition.Properties.UserAgentSettings[request.Browser.Browser];
if (userAgent != null) {
lock (session.SyncRoot) {
session.MaxConnectionsPerSession = userAgent.MaxStreamingConnectionsPerSession;
}
}
lock (session.SyncRoot) {
session.StreamingConnectionsCount++;
if (session.StreamingConnectionsCount == session.MaxConnectionsPerSession) {
canStream = true; // This thread got the last spot in the session.
session.CanStream = false;
} else if (session.StreamingConnectionsCount > session.MaxConnectionsPerSession) {
canStream = false;
session.StreamingConnectionsCount--;
_streamingClientsCount.Decrement();
} else {
canStream = true;
}
}
if (!canStream) {
string msg = string.Format("Cannot grant streaming connection, limit has been reached", this.Id);
try {
HandleBadRequest(msg, HttpContext.Current.Response);
} catch (HttpException) { }
return;
}
EndpointPushNotifier notifier = null;
try {
response.ContentType = ContentType.AMF;
response.AppendHeader("Cache-Control", "no-cache");
response.AppendHeader("Pragma", "no-cache");
response.AppendHeader("Connection", "close");
//response.AppendHeader("Transfer-Encoding", "chunked");
response.Flush();
// Setup for specific user agents.
byte[] kickStartBytesToStream = null;
int kickStartBytes = userAgent != null ? userAgent.KickstartBytes : 0;
if (kickStartBytes > 0) {
// The minimum number of actual bytes that need to be sent to kickstart, taking into account transfer-encoding overhead.
try {
int chunkLengthHeaderSize = System.Text.Encoding.ASCII.GetBytes(System.Convert.ToString(kickStartBytes, 0x10)).Length; //System.Text.ASCIIEncoding.ASCII.GetBytes(kickStartBytes.ToString("X")).Length;
int chunkOverhead = chunkLengthHeaderSize + 4; // 4 for the 2 wrapping CRLF tokens.
int minimumKickstartBytes = kickStartBytes - chunkOverhead;
kickStartBytesToStream = new byte[(minimumKickstartBytes > 0) ? minimumKickstartBytes : kickStartBytes];
} catch {
kickStartBytesToStream = new byte[kickStartBytes];
}
}
if (kickStartBytesToStream != null) {
StreamChunk(kickStartBytesToStream, response);
}
try {
notifier = new EndpointPushNotifier(this, flexClient);
lock (_currentStreamingRequests.SyncRoot) {
_currentStreamingRequests.Add(notifier.Id, notifier);
}
// Push down an acknowledgement for the 'connect' request containing the unique id for this specific stream.
AcknowledgeMessage connectAck = new AcknowledgeMessage();
connectAck.body = notifier.Id;
connectAck.correlationId = OpenCommand;
StreamMessage(connectAck, response);
} catch (MessageException) {
}
if (log.IsDebugEnabled) {
string msg = string.Format("Start streaming for endpoint with id {0} and client with id {1}", this.Id, flexClient.Id);
log.Debug(msg);
}
int serverToClientHeartbeatMillis = this.ChannelDefinition.Properties.ServerToClientHeartbeatMillis >= 0 ? this.ChannelDefinition.Properties.ServerToClientHeartbeatMillis : 0;
serverToClientHeartbeatMillis = 100;
while (!notifier.IsClosed) {
IList messages = notifier.GetPendingMessages();
StreamMessages(messages, response);
lock (notifier.SyncRoot) {
Monitor.Wait(notifier.SyncRoot, serverToClientHeartbeatMillis);
messages = notifier.GetPendingMessages();
// If there are no messages to send to the client, send a 0
// byte as a heartbeat to make sure the client is still valid.
if ((messages == null || messages.Count == 0) && serverToClientHeartbeatMillis > 0) {
try {
StreamChunk(Heartbeat, response);
response.Flush();
} catch (HttpException) {
break;
} catch (IOException) {
break;
}
} else {
StreamMessages(messages, response);
}
}
}
// Terminate the response.
StreamChunk(null, response);
if (log.IsDebugEnabled) {
string msg = string.Format("Releasing streaming connection for endpoint with id {0} and and client with id {1}", this.Id, flexClient.Id);
log.Debug(msg);
}
} catch (IOException ex)//HttpException?
{
if (log.IsWarnEnabled)
log.Warn("Streaming thread for endpoint with id " + this.Id + " is closing connection due to an IO error.", ex);
} catch (Exception ex) {
if (log.IsErrorEnabled)
log.Error("Streaming thread for endpoint with id " + this.Id + " is closing connection due to an error.", ex);
} finally {
if (notifier != null && _currentStreamingRequests != null) {
if (_currentStreamingRequests != null) {
lock (_currentStreamingRequests.SyncRoot) {
_currentStreamingRequests.Remove(notifier.Id);
}
}
notifier.Close();
}
_streamingClientsCount.Decrement();
lock (session.SyncRoot) {
session.StreamingConnectionsCount--;
session.CanStream = session.StreamingConnectionsCount < session.MaxConnectionsPerSession;
}
}
}
