/// <summary>
/// Checks if the tcp connection is healthy and that the host hasn't been modified,
/// if it has then the connection is reset.
/// </summary>
/// <param name="renderedFluentdHost">Host name of fluentd.</param>
protected void CheckConnectionIsValid(string renderedFluentdHost)
{
if (this._client == null || !this._client.Connected || _fluentdHost != renderedFluentdHost)
{
ResetConnection();
_fluentdHost = renderedFluentdHost;
InitiateTCPConnection();
if (this.UseSsl)
{
SetUpConnectionStream();
}
else
{
SetUpInsecureConnectionStream();
}
this._packer = new FluentdPacker(this._stream);
}
}
protected void Cleanup()
{
try
{
this.stream?.Dispose();
this.client?.Close();
}
catch (Exception ex)
{
NLog.Common.InternalLogger.Warn("Fluentd Close - " + ex.ToString());
}
finally
{
this.stream = null;
this.client = null;
this.emitter = null;
}
}
/// <summary>
/// Resets all objects related to the fluentd connection.
/// </summary>
protected void ResetConnection()
{
try
{
this._stream?.Dispose();
this._client?.Close();
}
catch (Exception ex)
{
NLog.Common.InternalLogger.Warn("Fluentd: Connection Reset Error - " + ex.ToString());
}
finally
{
this._stream = null;
this._client = null;
this._packer = null;
}
}
private void ConnectClient()
{
NLog.Common.InternalLogger.Debug("Fluentd Connecting to {0}:{1}, SSL:{2}", this.Host, this.Port, this.useSsl);
try
{
this.client.Connect(this.Host, this.Port);
}
catch (SocketException se)
{
InternalLogger.Error("Fluentd Extension Failed to connect against {0}:{1}", this.Host, this.Port);
throw;
}
if (this.useSsl)
{
SslStream sslStream = new SslStream(new BufferedStream(this.client.GetStream()),
false,
new RemoteCertificateValidationCallback(ValidateServerCertificate),
null,
EncryptionPolicy.RequireEncryption);
try
{
sslStream.AuthenticateAsClient(this.Host, null, SslProtocols.Tls12, true);
this.stream = sslStream;
}
catch (AuthenticationException e)
{
InternalLogger.Error("Fluentd Extension Failed to authenticate against {0}:{1}", this.Host, this.Port);
InternalLogger.Error("Exception: {0}", e.Message);
client.Close();
throw;
}
}
else
{
this.stream = new BufferedStream(this.client.GetStream());
}
this.emitter = new FluentdPacker(this.stream);
}