private async Task DataReceiver()
{
DisconnectReason reason = DisconnectReason.Normal;
while (true)
{
bool readLocked = false;
try
{
#region Check-for-Connection
if (_Client == null || !_Client.Connected)
{
_Settings.Logger?.Invoke(_Header + "disconnect detected");
break;
}
#endregion
#region Read-Message
while (true)
{
readLocked = await _ReadLock.WaitAsync(10, _Token).ConfigureAwait(false);
if (readLocked)
{
break;
}
await Task.Delay(10, _Token).ConfigureAwait(false);
}
WatsonMessage msg = new WatsonMessage(_DataStream, (_Settings.DebugMessages ? _Settings.Logger : null));
bool buildSuccess = await msg.BuildFromStream(_Token).ConfigureAwait(false);
if (!buildSuccess)
{
_Settings.Logger?.Invoke(_Header + "disconnect detected");
break;
}
if (msg == null)
{
await Task.Delay(30, _Token).ConfigureAwait(false);
continue;
}
#endregion
#region Process-by-Status
if (msg.Status == MessageStatus.Removed)
{
_Settings.Logger?.Invoke(_Header + "disconnect due to server-side removal");
reason = DisconnectReason.Removed;
break;
}
else if (msg.Status == MessageStatus.Shutdown)
{
_Settings.Logger?.Invoke(_Header + "disconnect due to server shutdown");
reason = DisconnectReason.Shutdown;
break;
}
else if (msg.Status == MessageStatus.Timeout)
{
_Settings.Logger?.Invoke(_Header + "disconnect due to timeout");
reason = DisconnectReason.Timeout;
break;
}
else if (msg.Status == MessageStatus.AuthSuccess)
{
_Settings.Logger?.Invoke(_Header + "authentication successful");
Task unawaited = Task.Run(() => _Events.HandleAuthenticationSucceeded(this, EventArgs.Empty), _Token);
continue;
}
else if (msg.Status == MessageStatus.AuthFailure)
{
_Settings.Logger?.Invoke(_Header + "authentication failed");
Task unawaited = Task.Run(() => _Events.HandleAuthenticationFailure(this, EventArgs.Empty), _Token);
continue;
}
else if (msg.Status == MessageStatus.AuthRequired)
{
_Settings.Logger?.Invoke(_Header + "authentication required by server; please authenticate using pre-shared key");
string psk = _Callbacks.HandleAuthenticationRequested();
if (!String.IsNullOrEmpty(psk))
{
Authenticate(psk);
}
continue;
}
#endregion
#region Process-Message
if (msg.SyncRequest != null && msg.SyncRequest.Value)
{
DateTime expiration = WatsonCommon.GetExpirationTimestamp(msg);
byte[] msgData = await WatsonCommon.ReadMessageDataAsync(msg, _Settings.StreamBufferSize).ConfigureAwait(false);
if (DateTime.Now < expiration)
{
SyncRequest syncReq = new SyncRequest(
_ServerIp + ":" + _ServerPort,
msg.ConversationGuid,
msg.Expiration.Value,
msg.Metadata,
msgData);
SyncResponse syncResp = _Callbacks.HandleSyncRequestReceived(syncReq);
if (syncResp != null)
{
WatsonCommon.BytesToStream(syncResp.Data, out long contentLength, out Stream stream);
WatsonMessage respMsg = new WatsonMessage(
syncResp.Metadata,
contentLength,
stream,
false,
true,
msg.Expiration.Value,
msg.ConversationGuid,
(_Settings.DebugMessages ? _Settings.Logger : null));
SendInternal(respMsg, contentLength, stream);
}
}
else
{
_Settings.Logger?.Invoke(_Header + "expired synchronous request received and discarded");
}
}
else if (msg.SyncResponse != null && msg.SyncResponse.Value)
{
// No need to amend message expiration; it is copied from the request, which was set by this node
// DateTime expiration = WatsonCommon.GetExpirationTimestamp(msg);
byte[] msgData = await WatsonCommon.ReadMessageDataAsync(msg, _Settings.StreamBufferSize).ConfigureAwait(false);
if (DateTime.Now < msg.Expiration.Value)
{
lock (_SyncResponseLock)
{
_SyncResponses.Add(msg.ConversationGuid, new SyncResponse(msg.Expiration.Value, msg.Metadata, msgData));
}
}
else
{
_Settings.Logger?.Invoke(_Header + "expired synchronous response received and discarded");
}
}
else
{
byte[] msgData = null;
if (_Events.IsUsingMessages)
{
msgData = await WatsonCommon.ReadMessageDataAsync(msg, _Settings.StreamBufferSize).ConfigureAwait(false);
MessageReceivedEventArgs args = new MessageReceivedEventArgs((_ServerIp + ":" + _ServerPort), msg.Metadata, msgData);
await Task.Run(() => _Events.HandleMessageReceived(this, args));
}
else if (_Events.IsUsingStreams)
{
StreamReceivedEventArgs sr = null;
WatsonStream ws = null;
if (msg.ContentLength >= _Settings.MaxProxiedStreamSize)
{
ws = new WatsonStream(msg.ContentLength, msg.DataStream);
sr = new StreamReceivedEventArgs((_ServerIp + ":" + _ServerPort), msg.Metadata, msg.ContentLength, ws);
// sr = new StreamReceivedFromServerEventArgs(msg.Metadata, msg.ContentLength, msg.DataStream);
// must run synchronously, data exists in the underlying stream
_Events.HandleStreamReceived(this, sr);
}
else
{
MemoryStream ms = WatsonCommon.DataStreamToMemoryStream(msg.ContentLength, msg.DataStream, _Settings.StreamBufferSize);
ws = new WatsonStream(msg.ContentLength, ms);
sr = new StreamReceivedEventArgs((_ServerIp + ":" + _ServerPort), msg.Metadata, msg.ContentLength, ws);
// sr = new StreamReceivedFromServerEventArgs(msg.Metadata, msg.ContentLength, ms);
// data has been read, can continue to next message
Task unawaited = Task.Run(() => _Events.HandleStreamReceived(this, sr), _Token);
}
}
else
{
_Settings.Logger?.Invoke(_Header + "event handler not set for either MessageReceived or StreamReceived");
break;
}
}
#endregion
_Statistics.IncrementReceivedMessages();
_Statistics.AddReceivedBytes(msg.ContentLength);
}
catch (ObjectDisposedException)
{
break;
}
catch (TaskCanceledException)
{
break;
}
catch (OperationCanceledException)
{
break;
}
catch (Exception e)
{
_Settings.Logger?.Invoke(
_Header + "data receiver exception for " + _ServerIp + ":" + _ServerPort + ":" +
Environment.NewLine +
SerializationHelper.SerializeJson(e, true) +
Environment.NewLine);
_Events.HandleExceptionEncountered(this, new ExceptionEventArgs(e));
break;
}
finally
{
if (readLocked && _ReadLock != null)
{
_ReadLock.Release();
}
}
}
Connected = false;
_Settings.Logger?.Invoke(_Header + "data receiver terminated for " + _ServerIp + ":" + _ServerPort);
_Events.HandleServerDisconnected(this, new DisconnectionEventArgs((_ServerIp + ":" + _ServerPort), reason));
}