public SimpleLoggerWriter()
{
// Look to see if Lambda's telemetry log file descriptor is available. If so use that for logging.
// This will make sure multiline log messages use a single CloudWatch Logs record.
var fileDescriptorLogId = Environment.GetEnvironmentVariable(Constants.ENVIRONMENT_VARIABLE_TELEMETRY_LOG_FD);
if (fileDescriptorLogId != null)
{
try
{
_writer = FileDescriptorLogFactory.GetWriter(fileDescriptorLogId);
InternalLogger.GetDefaultLogger().LogInformation("Using file descriptor stream writer for logging");
}
catch (Exception ex)
{
_writer = Console.Out;
InternalLogger.GetDefaultLogger().LogError(ex, "Error creating file descriptor log stream writer. Fallback to stdout.");
}
}
else
{
_writer = Console.Out;
InternalLogger.GetDefaultLogger().LogInformation("Using stdout for logging");
}
}
/// <summary>
/// Constructor used by bootstrap to put in place a wrapper TextWriter around stdout and stderror so all Console.Writeline calls
/// will be formatted.
///
/// Stdoud will default log messages to be Information
/// Stderror will default log messages to be Error
/// </summary>
public LogLevelLoggerWriter()
{
// Look to see if Lambda's telemetry log file descriptor is available. If so use that for logging.
// This will make sure multiline log messages use a single CloudWatch Logs record.
var fileDescriptorLogId = Environment.GetEnvironmentVariable(Constants.ENVIRONMENT_VARIABLE_TELEMETRY_LOG_FD);
if (fileDescriptorLogId != null)
{
try
{
var stdOutWriter = FileDescriptorLogFactory.GetWriter(fileDescriptorLogId);
var stdErrorWriter = FileDescriptorLogFactory.GetWriter(fileDescriptorLogId);
Initialize(stdOutWriter, stdErrorWriter);
InternalLogger.GetDefaultLogger().LogInformation("Using file descriptor stream writer for logging.");
}
catch (Exception ex)
{
InternalLogger.GetDefaultLogger().LogError(ex, "Error creating file descriptor log stream writer. Fallback to stdout and stderr.");
Initialize(Console.Out, Console.Error);
}
}
else
{
Initialize(Console.Out, Console.Error);
InternalLogger.GetDefaultLogger().LogInformation("Using stdout and stderr for logging.");
}
// SetOut will wrap our WrapperTextWriter with a synchronized TextWriter. Pass in the new synchronized
// TextWriter into our writer to make sure we obtain a lock on that instance before writing to the stdout.
Console.SetOut(_wrappedStdOutWriter);
_wrappedStdOutWriter.LockObject = Console.Out;
Console.SetError(_wrappedStdErrorWriter);
_wrappedStdErrorWriter.LockObject = Console.Error;
ConfigureLoggingActionField();
}
