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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Runtime;
using System.Runtime.Diagnostics;
using System.ServiceModel.Diagnostics;
using System.ServiceModel.Security;
using System.Threading;
using System.Threading.Tasks;
namespace System.ServiceModel.Channels
{
internal abstract class TransportDuplexSessionChannel : TransportOutputChannel, IDuplexSessionChannel, IAsyncDuplexSessionChannel
{
private bool _isInputSessionClosed;
private bool _isOutputSessionClosed;
private Uri _localVia;
private static Action<object> s_onWriteComplete = new Action<object>(OnWriteComplete);
protected TransportDuplexSessionChannel(
ChannelManagerBase manager,
ITransportFactorySettings settings,
EndpointAddress localAddress,
Uri localVia,
EndpointAddress remoteAddress,
Uri via)
: base(manager, remoteAddress, via, settings.ManualAddressing, settings.MessageVersion)
{
LocalAddress = localAddress;
_localVia = localVia;
BufferManager = settings.BufferManager;
SendLock = new SemaphoreSlim(1);
MessageEncoder = settings.MessageEncoderFactory.CreateSessionEncoder();
Session = new ConnectionDuplexSession(this);
}
public EndpointAddress LocalAddress { get; }
public SecurityMessageProperty RemoteSecurity { get; protected set; }
public IDuplexSession Session { get; protected set; }
protected SemaphoreSlim SendLock { get; }
protected BufferManager BufferManager { get; }
protected MessageEncoder MessageEncoder { get; set; }
internal SynchronizedMessageSource MessageSource { get; private set; }
protected abstract bool IsStreamedOutput { get; }
IAsyncDuplexSession ISessionChannel<IAsyncDuplexSession>.Session => Session as IAsyncDuplexSession;
public Message Receive()
{
return Receive(DefaultReceiveTimeout);
}
public Message Receive(TimeSpan timeout)
{
return ReceiveAsync(timeout).GetAwaiter().GetResult();
}
public Task<Message> ReceiveAsync()
{
return ReceiveAsync(DefaultReceiveTimeout);
}
public async Task<Message> ReceiveAsync(TimeSpan timeout)
{
Message message = null;
if (DoneReceivingInCurrentState())
{
return null;
}
bool shouldFault = true;
try
{
await TaskHelpers.EnsureDefaultTaskScheduler();
message = await MessageSource.ReceiveAsync(timeout);
OnReceiveMessage(message);
shouldFault = false;
return message;
}
finally
{
if (shouldFault)
{
if (message != null)
{
message.Close();
}
Fault();
}
}
}
public IAsyncResult BeginReceive(AsyncCallback callback, object state)
{
return BeginReceive(DefaultReceiveTimeout, callback, state);
}
public IAsyncResult BeginReceive(TimeSpan timeout, AsyncCallback callback, object state)
{
return ReceiveAsync(timeout).ToApm(callback, state);
}
public Message EndReceive(IAsyncResult result)
{
return result.ToApmEnd<Message>();
}
public IAsyncResult BeginTryReceive(TimeSpan timeout, AsyncCallback callback, object state)
{
return ReceiveAsync(timeout).ToApm(callback, state);
}
public bool EndTryReceive(IAsyncResult result, out Message message)
{
try
{
message = result.ToApmEnd<Message>();
return true;
}
catch (TimeoutException e)
{
if (WcfEventSource.Instance.ReceiveTimeoutIsEnabled())
{
WcfEventSource.Instance.ReceiveTimeout(e.Message);
}
message = null;
return false;
}
}
public async Task<(bool, Message)> TryReceiveAsync(TimeSpan timeout)
{
try
{
await TaskHelpers.EnsureDefaultTaskScheduler();
return (true, await ReceiveAsync(timeout));
}
catch(TimeoutException e)
{
if (WcfEventSource.Instance.ReceiveTimeoutIsEnabled())
{
WcfEventSource.Instance.ReceiveTimeout(e.Message);
}
return (false, null);
}
}
public bool TryReceive(TimeSpan timeout, out Message message)
{
try
{
message = Receive(timeout);
return true;
}
catch (TimeoutException e)
{
if (WcfEventSource.Instance.ReceiveTimeoutIsEnabled())
{
WcfEventSource.Instance.ReceiveTimeout(e.Message);
}
message = null;
return false;
}
}
public async Task<bool> WaitForMessageAsync(TimeSpan timeout)
{
if (DoneReceivingInCurrentState())
{
return true;
}
bool shouldFault = true;
try
{
await TaskHelpers.EnsureDefaultTaskScheduler();
bool success = await MessageSource.WaitForMessageAsync(timeout);
shouldFault = !success; // need to fault if we've timed out because we're now toast
return success;
}
finally
{
if (shouldFault)
{
Fault();
}
}
}
public bool WaitForMessage(TimeSpan timeout)
{
return WaitForMessageAsync(timeout).GetAwaiter().GetResult();
}
public IAsyncResult BeginWaitForMessage(TimeSpan timeout, AsyncCallback callback, object state)
{
return WaitForMessageAsync(timeout).ToApm(callback, state);
}
public bool EndWaitForMessage(IAsyncResult result)
{
return result.ToApmEnd<bool>();
}
protected void SetMessageSource(IMessageSource messageSource)
{
MessageSource = new SynchronizedMessageSource(messageSource);
}
protected abstract Task CloseOutputSessionCoreAsync(TimeSpan timeout);
protected abstract void CloseOutputSessionCore(TimeSpan timeout);
protected async Task CloseOutputSessionAsync(TimeSpan timeout)
{
ThrowIfNotOpened();
ThrowIfFaulted();
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
// If timeout == TimeSpan.MaxValue, then we want to pass Timeout.Infinite as
// SemaphoreSlim doesn't accept timeouts > Int32.MaxValue.
// Using TimeoutHelper.RemainingTime() would yield a value less than TimeSpan.MaxValue
// and would result in the value Int32.MaxValue so we must use the original timeout specified.
if (!await SendLock.WaitAsync(TimeoutHelper.ToMilliseconds(timeout)))
{
if (WcfEventSource.Instance.CloseTimeoutIsEnabled())
{
WcfEventSource.Instance.CloseTimeout(SRP.Format(SRP.CloseTimedOut, timeout));
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new TimeoutException(
SRP.Format(SRP.CloseTimedOut, timeout),
TimeoutHelper.CreateEnterTimedOutException(timeout)));
}
try
{
// check again in case the previous send faulted while we were waiting for the lock
ThrowIfFaulted();
// we're synchronized by sendLock here
if (_isOutputSessionClosed)
{
return;
}
_isOutputSessionClosed = true;
bool shouldFault = true;
try
{
await CloseOutputSessionCoreAsync(timeout);
OnOutputSessionClosed(ref timeoutHelper);
shouldFault = false;
}
finally
{
if (shouldFault)
{
Fault();
}
}
}
finally
{
SendLock.Release();
}
}
protected void CloseOutputSession(TimeSpan timeout)
{
ThrowIfNotOpened();
ThrowIfFaulted();
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
// If timeout == TimeSpan.MaxValue, then we want to pass Timeout.Infinite as
// SemaphoreSlim doesn't accept timeouts > Int32.MaxValue.
// Using TimeoutHelper.RemainingTime() would yield a value less than TimeSpan.MaxValue
// and would result in the value Int32.MaxValue so we must use the original timeout specified.
if (!SendLock.Wait(TimeoutHelper.ToMilliseconds(timeout)))
{
if (WcfEventSource.Instance.CloseTimeoutIsEnabled())
{
WcfEventSource.Instance.CloseTimeout(SRP.Format(SRP.CloseTimedOut, timeout));
}
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new TimeoutException(
SRP.Format(SRP.CloseTimedOut, timeout),
TimeoutHelper.CreateEnterTimedOutException(timeout)));
}
try
{
// check again in case the previous send faulted while we were waiting for the lock
ThrowIfFaulted();
// we're synchronized by sendLock here
if (_isOutputSessionClosed)
{
return;
}
_isOutputSessionClosed = true;
bool shouldFault = true;
try
{
CloseOutputSessionCore(timeout);
OnOutputSessionClosed(ref timeoutHelper);
shouldFault = false;
}
finally
{
if (shouldFault)
{
Fault();
}
}
}
finally
{
SendLock.Release();
}
}
// used to return cached connection to the pool/reader pool
protected abstract void ReturnConnectionIfNecessary(bool abort, TimeSpan timeout);
protected override void OnAbort()
{
ReturnConnectionIfNecessary(true, TimeSpan.Zero);
}
protected override void OnFaulted()
{
base.OnFaulted();
ReturnConnectionIfNecessary(true, TimeSpan.Zero);
}
protected internal override async Task OnCloseAsync(TimeSpan timeout)
{
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
await CloseOutputSessionAsync(timeoutHelper.RemainingTime());
// close input session if necessary
if (!_isInputSessionClosed)
{
await EnsureInputClosedAsync(timeoutHelper.RemainingTime());
OnInputSessionClosed();
}
CompleteClose(timeoutHelper.RemainingTime());
}
protected override void OnClose(TimeSpan timeout)
{
OnCloseAsync(timeout).GetAwaiter().GetResult();
}
protected override IAsyncResult OnBeginClose(TimeSpan timeout, AsyncCallback callback, object state)
{
return OnCloseAsync(timeout).ToApm(callback, state);
}
protected override void OnEndClose(IAsyncResult result)
{
result.ToApmEnd();
}
protected override void OnClosed()
{
base.OnClosed();
// clean up the CBT after transitioning to the closed state
//ChannelBindingUtility.Dispose(ref this.channelBindingToken);
}
protected virtual void OnReceiveMessage(Message message)
{
if (message == null)
{
OnInputSessionClosed();
}
else
{
PrepareMessage(message);
}
}
protected void ApplyChannelBinding(Message message)
{
//ChannelBindingUtility.TryAddToMessage(this.channelBindingToken, message, false);
}
protected virtual void PrepareMessage(Message message)
{
message.Properties.Via = _localVia;
ApplyChannelBinding(message);
if (FxTrace.Trace.IsEnd2EndActivityTracingEnabled)
{
EventTraceActivity eventTraceActivity = EventTraceActivityHelper.TryExtractActivity(message);
Guid relatedActivityId = EventTraceActivity.GetActivityIdFromThread();
if (eventTraceActivity == null)
{
eventTraceActivity = EventTraceActivity.GetFromThreadOrCreate();
EventTraceActivityHelper.TryAttachActivity(message, eventTraceActivity);
}
if (WcfEventSource.Instance.MessageReceivedByTransportIsEnabled())
{
WcfEventSource.Instance.MessageReceivedByTransport(
eventTraceActivity,
LocalAddress != null && LocalAddress.Uri != null ? LocalAddress.Uri.AbsoluteUri : string.Empty,
relatedActivityId);
}
}
}
protected abstract AsyncCompletionResult StartWritingBufferedMessage(Message message, ArraySegment<byte> messageData, bool allowOutputBatching, TimeSpan timeout, Action<object> callback, object state);
protected abstract AsyncCompletionResult BeginCloseOutput(TimeSpan timeout, Action<object> callback, object state);
protected virtual void FinishWritingMessage()
{
}
protected abstract ArraySegment<byte> EncodeMessage(Message message);
protected abstract void OnSendCore(Message message, TimeSpan timeout);
protected abstract AsyncCompletionResult StartWritingStreamedMessage(Message message, TimeSpan timeout, Action<object> callback, object state);
protected override async Task OnSendAsync(Message message, TimeSpan timeout)
{
ThrowIfDisposedOrNotOpen();
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
// If timeout == TimeSpan.MaxValue, then we want to pass Timeout.Infinite as
// SemaphoreSlim doesn't accept timeouts > Int32.MaxValue.
// Using TimeoutHelper.RemainingTime() would yield a value less than TimeSpan.MaxValue
// and would result in the value Int32.MaxValue so we must use the original timeout specified.
if (!await SendLock.WaitAsync(TimeoutHelper.ToMilliseconds(timeout)))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new TimeoutException(
SRP.Format(SRP.SendToViaTimedOut, Via, timeout),
TimeoutHelper.CreateEnterTimedOutException(timeout)));
}
byte[] buffer = null;
try
{
// check again in case the previous send faulted while we were waiting for the lock
ThrowIfDisposedOrNotOpen();
ThrowIfOutputSessionClosed();
bool success = false;
try
{
ApplyChannelBinding(message);
var tcs = new TaskCompletionSource<bool>(this);
AsyncCompletionResult completionResult;
if (IsStreamedOutput)
{
completionResult = StartWritingStreamedMessage(message, timeoutHelper.RemainingTime(), s_onWriteComplete, tcs);
}
else
{
bool allowOutputBatching;
ArraySegment<byte> messageData;
allowOutputBatching = message.Properties.AllowOutputBatching;
messageData = EncodeMessage(message);
buffer = messageData.Array;
completionResult = StartWritingBufferedMessage(
message,
messageData,
allowOutputBatching,
timeoutHelper.RemainingTime(),
s_onWriteComplete,
tcs);
}
if (completionResult == AsyncCompletionResult.Completed)
{
tcs.TrySetResult(true);
}
await tcs.Task;
FinishWritingMessage();
success = true;
if (WcfEventSource.Instance.MessageSentByTransportIsEnabled())
{
EventTraceActivity eventTraceActivity = EventTraceActivityHelper.TryExtractActivity(message);
WcfEventSource.Instance.MessageSentByTransport(eventTraceActivity, RemoteAddress.Uri.AbsoluteUri);
}
}
finally
{
if (!success)
{
Fault();
}
}
}
finally
{
SendLock.Release();
}
if (buffer != null)
{
BufferManager.ReturnBuffer(buffer);
}
}
private static void OnWriteComplete(object state)
{
if (state == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull(nameof(state));
}
var tcs = state as TaskCompletionSource<bool>;
if (tcs == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument("state", SRP.SPS_InvalidAsyncResult);
}
tcs.TrySetResult(true);
}
protected override void OnSend(Message message, TimeSpan timeout)
{
ThrowIfDisposedOrNotOpen();
TimeoutHelper timeoutHelper = new TimeoutHelper(timeout);
// If timeout == TimeSpan.MaxValue, then we want to pass Timeout.Infinite as
// SemaphoreSlim doesn't accept timeouts > Int32.MaxValue.
// Using TimeoutHelper.RemainingTime() would yield a value less than TimeSpan.MaxValue
// and would result in the value Int32.MaxValue so we must use the original timeout specified.
if (!SendLock.Wait(TimeoutHelper.ToMilliseconds(timeout)))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new TimeoutException(
SRP.Format(SRP.SendToViaTimedOut, Via, timeout),
TimeoutHelper.CreateEnterTimedOutException(timeout)));
}
try
{
// check again in case the previous send faulted while we were waiting for the lock
ThrowIfDisposedOrNotOpen();
ThrowIfOutputSessionClosed();
bool success = false;
try
{
ApplyChannelBinding(message);
OnSendCore(message, timeoutHelper.RemainingTime());
success = true;
if (WcfEventSource.Instance.MessageSentByTransportIsEnabled())
{
EventTraceActivity eventTraceActivity = EventTraceActivityHelper.TryExtractActivity(message);
WcfEventSource.Instance.MessageSentByTransport(eventTraceActivity, RemoteAddress.Uri.AbsoluteUri);
}
}
finally
{
if (!success)
{
Fault();
}
}
}
finally
{
SendLock.Release();
}
}
// cleanup after the framing handshake has completed
protected abstract void CompleteClose(TimeSpan timeout);
// must be called under sendLock
private void ThrowIfOutputSessionClosed()
{
if (_isOutputSessionClosed)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SRP.SendCannotBeCalledAfterCloseOutputSession));
}
}
private async Task EnsureInputClosedAsync(TimeSpan timeout)
{
Message message = await MessageSource.ReceiveAsync(timeout);
if (message != null)
{
using (message)
{
ProtocolException error = ProtocolException.ReceiveShutdownReturnedNonNull(message);
throw TraceUtility.ThrowHelperError(error, message);
}
}
}
private void OnInputSessionClosed()
{
lock (ThisLock)
{
if (_isInputSessionClosed)
{
return;
}
_isInputSessionClosed = true;
}
}
private void OnOutputSessionClosed(ref TimeoutHelper timeoutHelper)
{
bool releaseConnection = false;
lock (ThisLock)
{
if (_isInputSessionClosed)
{
// we're all done, release the connection
releaseConnection = true;
}
}
if (releaseConnection)
{
ReturnConnectionIfNecessary(false, timeoutHelper.RemainingTime());
}
}
public class ConnectionDuplexSession : IDuplexSession, IAsyncDuplexSession
{
private static UriGenerator s_uriGenerator;
private string _id;
public ConnectionDuplexSession(TransportDuplexSessionChannel channel)
: base()
{
Channel = channel;
}
public string Id
{
get
{
if (_id == null)
{
lock (Channel)
{
if (_id == null)
{
_id = UriGenerator.Next();
}
}
}
return _id;
}
}
public TransportDuplexSessionChannel Channel { get; }
private static UriGenerator UriGenerator
{
get
{
if (s_uriGenerator == null)
{
s_uriGenerator = new UriGenerator();
}
return s_uriGenerator;
}
}
public IAsyncResult BeginCloseOutputSession(AsyncCallback callback, object state)
{
return BeginCloseOutputSession(Channel.DefaultCloseTimeout, callback, state);
}
public IAsyncResult BeginCloseOutputSession(TimeSpan timeout, AsyncCallback callback, object state)
{
return Channel.CloseOutputSessionAsync(timeout).ToApm(callback, state);
}
public void EndCloseOutputSession(IAsyncResult result)
{
result.ToApmEnd();
}
public void CloseOutputSession()
{
CloseOutputSession(Channel.DefaultCloseTimeout);
}
public void CloseOutputSession(TimeSpan timeout)
{
Channel.CloseOutputSession(timeout);
}
public Task CloseOutputSessionAsync()
{
return CloseOutputSessionAsync(Channel.DefaultCloseTimeout);
}
public Task CloseOutputSessionAsync(TimeSpan timeout)
{
return Channel.CloseOutputSessionAsync(timeout);
}
}
}
}
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