/// <summary>
/// Establishes a new send-side HybridConnection and returns the Stream.
/// </summary>
public async Task <HybridConnectionStream> CreateConnectionAsync()
{
TrackingContext trackingContext = CreateTrackingContext(this.Address);
string traceSource = this.GetType().Name + "(" + trackingContext + ")";
var timeoutHelper = new TimeoutHelper(this.OperationTimeout);
RelayEventSource.Log.RelayClientConnectStart(traceSource);
try
{
var webSocket = new ClientWebSocket45();
webSocket.Options.Proxy = this.Proxy;
webSocket.Options.KeepAliveInterval = HybridConnectionConstants.KeepAliveInterval;
webSocket.Options.SetBuffer(this.ConnectionBufferSize, this.ConnectionBufferSize);
if (this.TokenProvider != null)
{
RelayEventSource.Log.GetTokenStart(traceSource);
var token = await this.TokenProvider.GetTokenAsync(
this.Address.GetLeftPart(UriPartial.Path), TokenProvider.DefaultTokenTimeout).ConfigureAwait(false);
RelayEventSource.Log.GetTokenStop(token.ExpiresAtUtc);
webSocket.Options.SetRequestHeader(RelayConstants.ServiceBusAuthorizationHeaderName, token.TokenString);
}
// Build the websocket uri, e.g. "wss://contoso.servicebus.windows.net:443/$hc/endpoint1?sb-hc-action=connect&sb-hc-id=E2E_TRACKING_ID"
Uri webSocketUri = HybridConnectionUtility.BuildUri(
this.Address.Host,
this.Address.Port,
this.Address.AbsolutePath,
this.Address.Query,
HybridConnectionConstants.Actions.Connect,
trackingContext.TrackingId);
using (var cancelSource = new CancellationTokenSource(timeoutHelper.RemainingTime()))
{
await webSocket.ConnectAsync(webSocketUri, cancelSource.Token).ConfigureAwait(false);
}
var trackingId = webSocket.ResponseHeaders[TrackingContext.TrackingIdName];
if (!string.IsNullOrEmpty(trackingId))
{
// Update to the flown trackingId (which has _GX suffix)
trackingContext = TrackingContext.Create(trackingId, trackingContext.SubsystemId);
traceSource = this.GetType().Name + "(" + trackingContext + ")";
}
return(new WebSocketStream(webSocket, trackingContext));
}
catch (WebSocketException wsException)
{
throw RelayEventSource.Log.ThrowingException(WebSocketExceptionHelper.ConvertToRelayContract(wsException), traceSource);
}
finally
{
RelayEventSource.Log.RelayClientConnectStop(traceSource);
}
}
async Task <WebSocket> ConnectAsync(CancellationToken cancellationToken)
{
Fx.Assert(!this.closeCalled, "Shouldn't call ConnectWebSocketAsync if CloseAsync was called.");
try
{
var connectDelay = ConnectDelayIntervals[this.connectDelayIndex];
if (connectDelay != TimeSpan.Zero)
{
await Task.Delay(connectDelay, cancellationToken).ConfigureAwait(false);
}
RelayEventSource.Log.RelayClientConnectStart(this.listener);
var webSocket = new ClientWebSocket45();
webSocket.Options.SetBuffer(this.bufferSize, this.bufferSize);
webSocket.Options.Proxy = this.listener.Proxy;
webSocket.Options.KeepAliveInterval = HybridConnectionConstants.KeepAliveInterval;
webSocket.Options.UserAgent = "ServiceBus/" + ClientAgentFileVersion;
var token = await this.tokenRenewer.GetTokenAsync().ConfigureAwait(false);
webSocket.Options.SetRequestHeader(RelayConstants.ServiceBusAuthorizationHeaderName, token.TokenString);
// When we reconnect we need to remove the "_GXX" suffix otherwise trackingId gets longer after each reconnect
string trackingId = TrackingContext.RemoveSuffix(this.listener.TrackingContext.TrackingId);
// Build the websocket uri, e.g. "wss://contoso.servicebus.windows.net:443/$hc/endpoint1?sb-hc-action=listen&sb-hc-id=E2E_TRACKING_ID"
var webSocketUri = HybridConnectionUtility.BuildUri(
this.address.Host,
this.address.Port,
this.address.AbsolutePath,
this.address.Query,
HybridConnectionConstants.Actions.Listen,
trackingId);
await webSocket.ConnectAsync(webSocketUri, cancellationToken).ConfigureAwait(false);
trackingId = webSocket.ResponseHeaders[TrackingContext.TrackingIdName];
if (!string.IsNullOrEmpty(trackingId))
{
// Update to the flown trackingId (which has _GX suffix)
this.listener.TrackingContext = TrackingContext.Create(trackingId, this.listener.TrackingContext.SubsystemId);
}
this.OnOnline();
return(webSocket);
}
catch (WebSocketException wsException)
{
throw RelayEventSource.Log.ThrowingException(WebSocketExceptionHelper.ConvertToRelayContract(wsException), this.listener);
}
finally
{
RelayEventSource.Log.RelayClientConnectStop(this.listener);
}
}
public async Task AcceptConnectionAsync()
{
try
{
// Performance: Address Resolution (ARP) work-around: When we receive the control message from a TCP connection which hasn't had any
// outbound traffic for 2 minutes the ARP cache no longer has the MAC address required to ACK the control message. If we also begin
// connecting a new socket at exactly the same time there's a known race condition (insert link here) where ARP can only resolve one
// address at a time, which causes the loser of the race to have to retry after 3000ms. To avoid the 3000ms delay we just pause for
// a few ms here instead.
await Task.Delay(TimeSpan.FromMilliseconds(2)).ConfigureAwait(false);
var timeoutHelper = new TimeoutHelper(AcceptTimeout);
var clientWebSocket = new ClientWebSocket45();
clientWebSocket.Options.SetBuffer(this.bufferSize, this.bufferSize);
clientWebSocket.Options.Host = this.Address.Host;
clientWebSocket.Options.Proxy = this.listener.Proxy;
clientWebSocket.Options.KeepAliveInterval = HybridConnectionConstants.KeepAliveInterval;
using (var cancelSource = new CancellationTokenSource(timeoutHelper.RemainingTime()))
{
await clientWebSocket.ConnectAsync(this.rendezvousAddress, cancelSource.Token).ConfigureAwait(false);
}
var webSocketStream = new WebSocketStream(clientWebSocket, this.TrackingContext);
this.AcceptSucceeded(webSocketStream);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
this.AcceptFailed(exception);
}
}
