public TransactionSignalScope(AsyncResult result, Transaction transaction)
{
Fx.Assert(transaction != null, "Null Transaction provided to AsyncResult.TransactionSignalScope.");
_parent = result;
_transactionScope = Fx.CreateTransactionScope(transaction);
}
public void DebugVerifyEmpty()
{
Fx.Assert(this.gate == 0, "Finalized with unfinished slot.");
Fx.Assert(this.heldCallback == null, "Finalized with leaked callback.");
Fx.Assert(this.heldState == null, "Finalized with leaked state.");
}
protected bool TryComplete(bool didCompleteSynchronously, Exception exception)
{
lock (ThisLock)
{
if (IsCompleted)
{
return(false);
}
_exception = exception;
IsCompleted = true;
}
#if DEBUG
_marker.AsyncResult = null;
_marker = null;
#endif
CompletedSynchronously = didCompleteSynchronously;
if (OnCompleting != null)
{
// Allow exception replacement, like a catch/throw pattern.
try
{
OnCompleting(this, _exception);
}
catch (Exception e) when(!Fx.IsFatal(e))
{
_exception = e;
}
}
if (didCompleteSynchronously)
{
// If we completedSynchronously, then there's no chance that the manualResetEvent was created so
// we don't need to worry about a race
Fx.Assert(_manualResetEvent == null, "No ManualResetEvent should be created for a synchronous AsyncResult.");
}
else
{
lock (ThisLock)
{
if (_manualResetEvent != null)
{
_manualResetEvent.Set();
}
}
}
if (_callback != null)
{
try
{
if (VirtualCallback != null)
{
VirtualCallback(_callback, this);
}
else
{
_callback(this);
}
}
#pragma warning disable 1634
#pragma warning suppress 56500 // transferring exception to another thread
catch (Exception e)
{
if (Fx.IsFatal(e))
{
throw;
}
throw Fx.Exception.AsError(new InvalidOperationException(CommonResources.AsyncCallbackThrewException, e));
}
#pragma warning restore 1634
}
return(true);
}
public static void End(IAsyncResult result)
{
Fx.AssertAndThrowFatal(result.IsCompleted, "CompletedAsyncResult was not completed!");
AsyncResult.End <CompletedAsyncResult>(result);
}
void CompletionCallback(out Action <object> callback, out object state)
{
int slot = this.headTail;
int slotLowPri;
while (true)
{
Fx.Assert(Bits.Count(slot) != -1, "CompletionCallback called on idle IOTS!");
bool wasEmpty = Bits.Count(slot) == 0;
if (wasEmpty)
{
// We're about to set this to idle. First check the low-priority queue. This alone doesn't
// guarantee we service all the low-pri items - there hasn't even been an Interlocked yet. But
// we take care of that later.
slotLowPri = this.headTailLowPri;
while (Bits.CountNoIdle(slotLowPri) != 0)
{
if (slotLowPri == (slotLowPri = Interlocked.CompareExchange(ref this.headTailLowPri,
Bits.IncrementLo(slotLowPri), slotLowPri)))
{
this.overlapped.Post(this);
this.slotsLowPri[slotLowPri & SlotMaskLowPri].DequeueWorkItem(out callback, out state);
return;
}
}
}
if (slot == (slot = Interlocked.CompareExchange(ref this.headTail, Bits.IncrementLo(slot), slot)))
{
if (!wasEmpty)
{
this.overlapped.Post(this);
this.slots[slot & SlotMask].DequeueWorkItem(out callback, out state);
return;
}
// We just set the IOThreadScheduler to idle. Check if a low-priority item got added in the
// interim.
// Interlocked calls create a thread barrier, so this read will give us the value of
// headTailLowPri at the time of the interlocked that set us to idle, or later. The invariant
// here is that either the low-priority queue was empty at some point after we set the IOTS to
// idle (so that the next enqueue will notice, and issue a Post), or that the IOTS was unidle at
// some point after we set it to idle (so that the next attempt to go idle will verify that the
// low-priority queue is empty).
slotLowPri = this.headTailLowPri;
if (Bits.CountNoIdle(slotLowPri) != 0)
{
// Whoops, go back from being idle (unless someone else already did). If we go back, start
// over. (We still owe a Post.)
slot = Bits.IncrementLo(slot);
if (slot == Interlocked.CompareExchange(ref this.headTail, slot + Bits.HiOne, slot))
{
slot += Bits.HiOne;
continue;
}
// We know that there's a low-priority work item. But we also know that the IOThreadScheduler
// wasn't idle. It's best to let it take care of itself, since according to this method, we
// just set the IOThreadScheduler to idle so shouldn't take on any tasks.
}
break;
}
}
callback = null;
state = null;
return;
}
void IdleTimerCallback()
{
Fx.Assert(this.referenceCount == 0, "Cached IotHubConnection's ref count should be zero when idle timeout occurs!");
this.cache.RemoveHubScopeConnectionPool(this.ConnectionString);
this.Connection.CloseAsync().Fork();
}
/// <summary>
/// Copies the properties from the amqp message to the Message instance.
/// </summary>
public static void UpdateMessageHeaderAndProperties(AmqpMessage amqpMessage, Message data)
{
Fx.AssertAndThrow(amqpMessage.DeliveryTag != null, "AmqpMessage should always contain delivery tag.");
data.DeliveryTag = amqpMessage.DeliveryTag;
SectionFlag sections = amqpMessage.Sections;
if ((sections & SectionFlag.Properties) != 0)
{
// Extract only the Properties that we support
data.MessageId = amqpMessage.Properties.MessageId != null?amqpMessage.Properties.MessageId.ToString() : null;
data.To = amqpMessage.Properties.To != null?amqpMessage.Properties.To.ToString() : null;
if (amqpMessage.Properties.AbsoluteExpiryTime.HasValue)
{
data.ExpiryTimeUtc = amqpMessage.Properties.AbsoluteExpiryTime.Value;
}
data.CorrelationId = amqpMessage.Properties.CorrelationId != null?amqpMessage.Properties.CorrelationId.ToString() : null;
data.UserId = amqpMessage.Properties.UserId.Array != null?Encoding.UTF8.GetString(amqpMessage.Properties.UserId.Array, 0 /*index*/, amqpMessage.Properties.UserId.Array.Length) : null;
if (!string.IsNullOrWhiteSpace(amqpMessage.Properties.ContentType.Value))
{
data.ContentType = amqpMessage.Properties.ContentType.Value;
}
if (!string.IsNullOrWhiteSpace(amqpMessage.Properties.ContentEncoding.Value))
{
data.ContentEncoding = amqpMessage.Properties.ContentEncoding.Value;
}
}
if ((sections & SectionFlag.MessageAnnotations) != 0)
{
string lockToken;
if (amqpMessage.MessageAnnotations.Map.TryGetValue(LockTokenName, out lockToken))
{
data.LockToken = lockToken;
}
ulong sequenceNumber;
if (amqpMessage.MessageAnnotations.Map.TryGetValue(SequenceNumberName, out sequenceNumber))
{
data.SequenceNumber = sequenceNumber;
}
DateTime enqueuedTime;
if (amqpMessage.MessageAnnotations.Map.TryGetValue(MessageSystemPropertyNames.EnqueuedTime, out enqueuedTime))
{
data.EnqueuedTimeUtc = enqueuedTime;
}
byte deliveryCount;
if (amqpMessage.MessageAnnotations.Map.TryGetValue(MessageSystemPropertyNames.DeliveryCount, out deliveryCount))
{
data.DeliveryCount = deliveryCount;
}
}
if ((sections & SectionFlag.ApplicationProperties) != 0)
{
foreach (KeyValuePair <MapKey, object> pair in amqpMessage.ApplicationProperties.Map)
{
object netObject = null;
if (TryGetNetObjectFromAmqpObject(pair.Value, MappingType.ApplicationProperty, out netObject))
{
var stringObject = netObject as string;
if (stringObject != null)
{
switch (pair.Key.ToString())
{
case MessageSystemPropertyNames.Operation:
data.SystemProperties[pair.Key.ToString()] = stringObject;
break;
case MessageSystemPropertyNames.MessageSchema:
data.MessageSchema = stringObject;
break;
case MessageSystemPropertyNames.CreationTimeUtc:
data.CreationTimeUtc = DateTime.Parse(stringObject);
break;
default:
data.Properties[pair.Key.ToString()] = stringObject;
break;
}
}
else
{
// TODO: RDBug 4093369 Handling of non-string property values in Amqp messages
// Drop non-string properties and log an error
Fx.Exception.TraceHandled(new InvalidDataException("IotHub does not accept non-string Amqp properties"), "MessageConverter.UpdateMessageHeaderAndProperties");
}
}
}
}
}
public static void Fork(this Task thisTask, string tracingInfo)
{
Fx.Assert(thisTask != null, "task is required!");
thisTask.ContinueWith(t => Fx.Exception.TraceHandled(t.Exception, tracingInfo), TaskContinuationOptions.OnlyOnFaulted);
}
public async Task <int> ReceiveAsync(byte[] buffer, int offset, int size, TimeSpan timeout)
{
if (Logging.IsEnabled)
{
Logging.Enter(this, timeout, $"{nameof(IotHubClientWebSocket)}.{nameof(ReceiveAsync)}");
}
byte[] header = new byte[2];
Fx.AssertAndThrow(this.State == WebSocketState.Open, ClientWebSocketNotInOpenStateDuringReceive);
this.TcpClient.ReceiveTimeout = TimeoutHelper.ToMilliseconds(timeout);
bool succeeded = false;
try
{
byte payloadLength;
bool pongFrame;
// TODO: rewrite this section to handle all control frames (including ping)
int totalBytesRead;
int bytesRead;
do
{
// Ignore pong frame and start over
totalBytesRead = 0;
do
{
bytesRead = await this.WebSocketStream.ReadAsync(header, totalBytesRead, header.Length - totalBytesRead).ConfigureAwait(false);
if (bytesRead == 0)
{
throw new IOException(FramingPrematureEOF, new InvalidDataException("IotHubClientWebSocket was expecting more bytes"));
}
totalBytesRead += bytesRead;
}while (totalBytesRead < header.Length);
if (!ParseWebSocketFrameHeader(header, out payloadLength, out pongFrame))
{
// Encountered a close frame or error in parsing frame from server. Close connection
var closeHeader = PrepareWebSocketHeader(0, WebSocketMessageType.Close);
await this.WebSocketStream.WriteAsync(closeHeader, 0, closeHeader.Length).ConfigureAwait(false);
this.State = WebSocketState.Closed;
#if !NETSTANDARD1_3
this.WebSocketStream?.Close();
this.TcpClient?.Close();
#else
this.WebSocketStream?.Dispose();
this.TcpClient?.Dispose();
#endif
return(0); // TODO: throw exception?
}
if (pongFrame && payloadLength > 0)
{
totalBytesRead = 0;
var tempBuffer = new byte[payloadLength];
while (totalBytesRead < payloadLength)
{
bytesRead = await this.WebSocketStream.ReadAsync(tempBuffer, totalBytesRead, payloadLength - totalBytesRead).ConfigureAwait(false);
if (bytesRead == 0)
{
throw new IOException(FramingPrematureEOF, new InvalidDataException("IotHubClientWebSocket was expecting more bytes"));
}
totalBytesRead += bytesRead;
}
}
}while (pongFrame);
totalBytesRead = 0;
if (buffer.Length < payloadLength)
{
throw Fx.Exception.AsError(new InvalidOperationException(Resources.SizeExceedsRemainingBufferSpace));
}
if (payloadLength < MediumSizeFrame)
{
while (totalBytesRead < payloadLength)
{
bytesRead = await this.WebSocketStream.ReadAsync(buffer, offset + totalBytesRead, payloadLength - totalBytesRead).ConfigureAwait(false);
if (bytesRead == 0)
{
throw new IOException(FramingPrematureEOF, new InvalidDataException("IotHubClientWebSocket was expecting more bytes"));
}
totalBytesRead += bytesRead;
}
}
else
{
switch (payloadLength)
{
case MediumSizeFrame:
// read payload length (< 64K)
do
{
bytesRead = await this.WebSocketStream.ReadAsync(header, totalBytesRead, header.Length - totalBytesRead).ConfigureAwait(false);
if (bytesRead == 0)
{
throw new IOException(FramingPrematureEOF, new InvalidDataException("IotHubClientWebSocket was expecting more bytes"));
}
totalBytesRead += bytesRead;
}while (totalBytesRead < header.Length);
totalBytesRead = 0;
ushort extendedPayloadLength = (ushort)((header[0] << 8) | header[1]);
// read payload
if (buffer.Length >= extendedPayloadLength)
{
while (totalBytesRead < extendedPayloadLength)
{
bytesRead = await this.WebSocketStream.ReadAsync(buffer, offset + totalBytesRead, extendedPayloadLength - totalBytesRead).ConfigureAwait(false);
if (bytesRead == 0)
{
throw new IOException(FramingPrematureEOF, new InvalidDataException("IotHubClientWebSocket was expecting more bytes"));
}
totalBytesRead += bytesRead;
}
}
else
{
throw Fx.Exception.AsError(new InvalidOperationException(Resources.SizeExceedsRemainingBufferSpace));
}
break;
case LargeSizeFrame:
// read payload length (>= 64K)
var payloadLengthBuffer = new byte[8];
do
{
bytesRead = await this.WebSocketStream.ReadAsync(payloadLengthBuffer, totalBytesRead, payloadLengthBuffer.Length - totalBytesRead).ConfigureAwait(false);
if (bytesRead == 0)
{
throw new IOException(FramingPrematureEOF, new InvalidDataException("IotHubClientWebSocket was expecting more bytes"));
}
totalBytesRead += bytesRead;
}while (totalBytesRead < payloadLengthBuffer.Length);
totalBytesRead = 0;
// ignore bytes 0-3 - length cannot be larger than a 32-bit number
uint superExtendedPayloadLength = (uint)((payloadLengthBuffer[4] << 24) | (payloadLengthBuffer[5] << 16) | (payloadLengthBuffer[6] << 8) | payloadLengthBuffer[7]);
// read payload
if (buffer.Length >= superExtendedPayloadLength)
{
while (totalBytesRead < superExtendedPayloadLength)
{
bytesRead = await this.WebSocketStream.ReadAsync(buffer, offset + totalBytesRead, (int)(superExtendedPayloadLength - totalBytesRead)).ConfigureAwait(false);
if (bytesRead == 0)
{
throw new IOException(FramingPrematureEOF, new InvalidDataException("IotHubClientWebSocket was expecting more bytes"));
}
totalBytesRead += bytesRead;
}
}
else
{
throw Fx.Exception.AsError(new InvalidOperationException(Resources.SizeExceedsRemainingBufferSpace));
}
break;
}
}
succeeded = true;
return(totalBytesRead);
}
finally
{
if (!succeeded)
{
this.Fault();
}
if (Logging.IsEnabled)
{
Logging.Exit(this, timeout, $"{nameof(IotHubClientWebSocket)}.{nameof(ReceiveAsync)}");
}
}
}
void SetDeadline()
{
Fx.Assert(!deadlineSet, "TimeoutHelper deadline set twice.");
this.deadline = DateTime.UtcNow + this.originalTimeout;
this.deadlineSet = true;
}
public static Exception AssertAndThrowFatal(string description)
{
Fx.Assert(description);
throw Fx.Exception.AsError(new FatalException(description));
}
public static Exception AssertAndThrow(string description)
{
Fx.Assert(description);
throw Fx.Exception.AsError(new AssertionFailedException(description));
}
