/// <summary>
/// Constructor.
/// </summary>
/// <param name="host">Hostname to log to.</param>
/// <param name="port">Port on remote host.</param>
/// <param name="policy">An object embodying a reconnection policy for if the
/// TCP session drops (defaults to ExponentialBackoffTcpConnectionPolicy).</param>
/// <param name="maxQueueSize">The maximum number of events to queue if the
/// TCP session goes down. If more events are queued, old ones will be dropped
/// (defaults to 10,000).</param>
/// <param name="progress">An IProgress instance that will be triggered when
/// an event is pulled from the queue and written to the TCP port (defaults to a new
/// Progress object accessible via the Progress property).</param>
public TcpTraceListener(string host, int port, ITcpReconnectionPolicy policy,
int maxQueueSize = 10000)
: this(host.HostnameToIPAddress(), port, policy, maxQueueSize)
{
}
/// <summary>
/// Construct a TCP socket writer that writes to the given host and port.
/// </summary>
/// <param name="host">IPAddress of the host to open a TCP socket to.</param>
/// <param name="port">TCP port to use on the target host.</param>
/// <param name="policy">A TcpConnectionPolicy object defining reconnect behavior.</param>
/// <param name="maxQueueSize">The maximum number of log entries to queue before starting to drop entries.</param>
/// <param name="progress">An IProgress object that reports when the queue of entries to be written reaches empty or there is
/// a reconnection failure. This is used for testing purposes only.</param>
public TcpSocketWriter(IPAddress host, int port, ITcpReconnectionPolicy policy,
int maxQueueSize, Func <IPAddress, int, Socket> connect = null)
{
this.host = host;
this.port = port;
this.reconnectPolicy = policy;
this.eventQueue = new FixedSizeQueue <string>(maxQueueSize);
this.tokenSource = new CancellationTokenSource();
if (connect == null)
{
this.tryOpenSocket = (h, p) =>
{
try
{
var socket = new Socket(SocketType.Stream, ProtocolType.Tcp);
socket.Connect(host, port);
return(socket);
}
catch (SocketException e)
{
LoggingFailureHandler(e);
throw;
}
};
}
else
{
this.tryOpenSocket = (h, p) =>
{
try
{
return(connect(h, p));
}
catch (SocketException e)
{
LoggingFailureHandler(e);
throw;
}
};
}
var threadReady = new TaskCompletionSource <bool>();
queueListener = new Thread(() =>
{
try
{
this.socket = this.reconnectPolicy.Connect(tryOpenSocket, host, port, tokenSource.Token);
threadReady.SetResult(true); // Signal the calling thread that we are ready.
string entry = null;
while (this.socket != null) // null indicates that the thread has been cancelled and cleaned up.
{
if (tokenSource.Token.IsCancellationRequested)
{
eventQueue.CompleteAdding();
// Post-condition: no further items will be added to the queue, so there will be a finite number of items to handle.
while (eventQueue.Count > 0)
{
entry = eventQueue.Dequeue();
try
{
this.socket.Send(Encoding.UTF8.GetBytes(entry));
}
catch (SocketException ex)
{
LoggingFailureHandler(ex);
}
}
break;
}
else if (entry == null)
{
entry = eventQueue.Dequeue(tokenSource.Token);
}
else if (entry != null)
{
try
{
if (this.socket.Send(Encoding.UTF8.GetBytes(entry)) != -1)
{
entry = null;
}
}
catch (SocketException ex)
{
LoggingFailureHandler(ex);
this.socket = this.reconnectPolicy.Connect(tryOpenSocket, host, port, tokenSource.Token);
}
}
}
}
catch (Exception e)
{
LoggingFailureHandler(e);
}
finally
{
if (socket != null)
{
socket.Dispose();
}
disposed.SetResult(true);
}
});
queueListener.IsBackground = true; // Prevent the thread from blocking the process from exiting.
queueListener.Start();
threadReady.Task.Wait();
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="host">IP address to log to.</param>
/// <param name="port">Port on remote host.</param>
/// <param name="policy">An object embodying a reconnection policy for if the
/// TCP session drops (defaults to ExponentialBackoffTcpConnectionPolicy).</param>
/// <param name="maxQueueSize">The maximum number of events to queue if the
/// TCP session goes down. If more events are queued, old ones will be dropped
/// (defaults to 10,000).</param>
/// <param name="progress">An IProgress instance that will be triggered when
/// an event is pulled from the queue and written to the TCP port (defaults to a new
/// Progress object accessible via the Progress property).</param>
public TcpTraceListener(IPAddress host, int port, ITcpReconnectionPolicy policy,
int maxQueueSize = 10000)
: base()
{
this.writer = new TcpSocketWriter(host, port, policy, maxQueueSize);
}
/// <summary>
/// Set up a sink.
/// </summary>
/// <param name="host">Hostname of the host to write to.</param>
/// <param name="port">TCP port to write to.</param>
/// <param name="formatter">An object to specify the format events should be
/// written in (default to <code>{timestamp} EventId={...} EventName={...} Level={...} "FormattedMessage={...}"</code>).</param>
/// <param name="policy">An object defining the reconnect policy in the event
/// of TCP errors (default: an ExponentialBackoffTcpConnectionPolicy object).</param>
/// <param name="maxQueueSize">The maximum number of events to queue in the event of
/// the TCP session dropping before events start to be dropped (defaults to 10,000).</param>
/// <param name="progress">A progress reporter that triggers when events are written from
/// the queue to the TCP port (defaults to a new Progress object). It is reachable
/// via the Progress property.</param>
public TcpEventSink(string host, int port, ITcpReconnectionPolicy policy,
IEventTextFormatter formatter = null, int maxQueueSize = 10000) :
this(host.HostnameToIPAddress(), port, policy, formatter, maxQueueSize)
{
}
/// <summary>
/// Set up a sink.
/// </summary>
/// <param name="host">IP address of the host to write to.</param>
/// <param name="port">TCP port to write to.</param>
/// <param name="formatter">An object to specify the format events should be
/// written in (defaults to <code>{timestamp} EventId={...} EventName={...} Level={...} "FormattedMessage={...}"</code>).</param>
/// <param name="policy">An object defining the reconnect policy in the event
/// of TCP errors (default: an ExponentialBackoffTcpConnectionPolicy object).</param>
/// <param name="maxQueueSize">The maximum number of events to queue in the event of
/// the TCP session dropping before events start to be dropped (defaults to 10,000).</param>
/// <param name="progress">A progress reporter that triggers when events are written from
/// the queue to the TCP port (defaults to a new Progress object). It is reachable
/// via the Progress property.</param>
public TcpEventSink(IPAddress host, int port, ITcpReconnectionPolicy policy,
IEventTextFormatter formatter = null, int maxQueueSize = 10000)
{
this.writer = new TcpSocketWriter(host, port, policy, maxQueueSize);
this.formatter = formatter;
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="host">Hostname to log to.</param>
/// <param name="port">Port on remote host.</param>
/// <param name="policy">An object embodying a reconnection policy for if the
/// TCP session drops (defaults to ExponentialBackoffTcpConnectionPolicy).</param>
/// <param name="maxQueueSize">The maximum number of events to queue if the
/// TCP session goes down. If more events are queued, old ones will be dropped
/// (defaults to 10,000).</param>
/// <param name="progress">An IProgress instance that will be triggered when
/// an event is pulled from the queue and written to the TCP port (defaults to a new
/// Progress object accessible via the Progress property).</param>
public TcpTraceListener(string host, int port, ITcpReconnectionPolicy policy,
int maxQueueSize = 10000) :
this(host.HostnameToIPAddress(), port, policy, maxQueueSize)
{
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="host">IP address to log to.</param>
/// <param name="port">Port on remote host.</param>
/// <param name="policy">An object embodying a reconnection policy for if the
/// TCP session drops (defaults to ExponentialBackoffTcpConnectionPolicy).</param>
/// <param name="maxQueueSize">The maximum number of events to queue if the
/// TCP session goes down. If more events are queued, old ones will be dropped
/// (defaults to 10,000).</param>
/// <param name="progress">An IProgress instance that will be triggered when
/// an event is pulled from the queue and written to the TCP port (defaults to a new
/// Progress object accessible via the Progress property).</param>
public TcpTraceListener(IPAddress host, int port, ITcpReconnectionPolicy policy,
int maxQueueSize = 10000) : base()
{
this.writer = new TcpSocketWriter(host, port, policy, maxQueueSize);
}
