/// <summary>
/// Performs the action specified by the <paramref name="args"/> parameter.
/// </summary>
/// <param name="args">
/// Command-line arguments provided by Splunk when it invokes the
/// modular input program. Implementers should pass the arguments to
/// the main method of the program as the value of this parameter.
/// </param>
/// <returns>
/// <param name="stdin">
/// Reader to use for the stdin stream
/// </param>
/// <param name="stdout">
/// Writer to use for the stdout stream
/// </param>
/// <param name="stderr">
/// Writer to use for the stderr stream
/// </param>
/// <param name="progress">
/// Reports back progress as events are written to the <see cref="EventWriter"/>
/// </param>
/// <param name="attachPoints">
/// Defines the <see cref="DebuggerAttachPoints"/> for this input
/// </param>
/// <param name="timeout">
/// Number of seconds to wait for a debugger to attach before continuing processing.
/// </param>
/// A value which should be used as the exit code from the modular
/// input program. A value of <c>0</c> indicates success. A non-zero
/// value indicates failure.
/// </returns>
/// <remarks>
/// If the <paramref name="args"/> are not in the supported set of values,
/// the method will do nothing and return a non-zero value. Any
/// exceptions and internal progress messages encountered during
/// execution are written to the splunkd log file.
/// </remarks>
public async Task <int> RunAsync(string[] args,
TextReader stdin = null,
TextWriter stdout = null,
TextWriter stderr = null,
IProgress <EventWrittenProgressReport> progress = null,
DebuggerAttachPoints attachPoints = DebuggerAttachPoints.None,
uint timeout = 0
)
{
EventWriter writer = null;
string name = this.GetType().FullName;
try
{
/// Console default is OEM text encoding, which is not handled by Splunk,
//// resulting in loss of chars such as O with an umlaut (\u0150)
//// Splunk's default is UTF8.
if (stdin == null)
{
stdin = Console.In;
Console.InputEncoding = Encoding.UTF8;
}
if (stdout == null)
{
stdout = Console.Out;
Console.OutputEncoding = Encoding.UTF8;
}
if (stderr == null)
{
stderr = Console.Error;
Console.OutputEncoding = Encoding.UTF8;
}
if (progress == null)
{
progress = new Progress <EventWrittenProgressReport>();
}
writer = new EventWriter(stdout, stderr, progress);
// Check if the developer has specified they want to attach a debugger
bool wait = ShouldWaitForDebuggerToAttach(args, attachPoints);
// If a debugger is going to attach
if (wait)
{
WaitForAttach(timeout);
}
if (args.Length == 0)
{
try
{
List <Task> instances = new List <Task>();
InputDefinitionCollection inputDefinitions =
(InputDefinitionCollection) new XmlSerializer(typeof(InputDefinitionCollection)).
Deserialize(stdin);
foreach (InputDefinition inputDefinition in inputDefinitions)
{
var inputTask = this.StreamEventsAsync(inputDefinition, writer);
instances.Add(inputTask);
var inputName = inputDefinition.Name;
inputTask.ContinueWith(t =>
{
if (inputTask.Exception != null)
{
var message = RemoveNewLines(inputTask.Exception.InnerException.ToString());
writer.LogAsync(Severity.Fatal,
string.Format("Exception during streaming: name={0} | {1}", inputName, message))
.Wait();
}
});
}
try
{
await Task.WhenAll(instances.ToArray());
}
catch
{
}
await writer.CompleteAsync();
}
catch (Exception e)
{
var message = RemoveNewLines(e.ToString());
writer.LogAsync(Severity.Fatal,
string.Format("Exception during streaming: name={0} | {1}", name, message))
.Wait();
return(-1);
}
return(0);
}
if (args[0].ToLower().Equals("--scheme"))
{
Scheme scheme = null;
try
{
scheme = this.Scheme;
if (scheme != null)
{
StringWriter stringWriter = new StringWriter();
new XmlSerializer(typeof(Scheme)).Serialize(stringWriter, scheme);
stdout.WriteLine(stringWriter.ToString());
return(0);
}
throw new NullReferenceException("Scheme was null; could not serialize.");
}
catch (Exception e)
{
var message = RemoveNewLines(e.ToString());
writer.LogAsync(Severity.Fatal,
string.Format("Exception getting scheme: name={0} | {1}", name, message))
.Wait();
return(-1);
}
finally
{
writer.CompleteAsync().Wait();
}
}
if (args[0].ToLower().Equals("--validate-arguments"))
{
string errorMessage = null;
string inputDoc = null;
try
{
inputDoc = await stdin.ReadToEndAsync();
inputDoc = RemoveNewLines(inputDoc);
writer.LogAsync(Severity.Info, inputDoc).Wait();
Validation validation = (Validation) new XmlSerializer(typeof(Validation)).
Deserialize(new StringReader(inputDoc));
name = validation.Name;
bool validationSuccessful = true;
Scheme scheme = this.Scheme;
foreach (Argument arg in scheme.Arguments)
{
if (arg.ValidationDelegate != null)
{
if (!arg.ValidationDelegate(validation.Parameters[arg.Name], out errorMessage))
{
validationSuccessful = false;
break;
}
}
}
if (validationSuccessful && this.Validate(validation, out errorMessage))
{
return(0); // Validation succeeded
}
}
catch (Exception e)
{
var message = RemoveNewLines(e.ToString());
errorMessage = e.Message;
writer.LogAsync(Severity.Fatal,
string.Format("Exception during validation: name={0} | {1}", name, message))
.Wait();
}
finally
{
writer.CompleteAsync().Wait();
}
if (errorMessage != null)
{
using (var xmlWriter = XmlWriter.Create(stdout, new XmlWriterSettings
{
Async = true,
ConformanceLevel = ConformanceLevel.Fragment
}))
{
await xmlWriter.WriteStartElementAsync(prefix : null, localName : "error", ns : null);
await
xmlWriter.WriteElementStringAsync(prefix : null, localName : "message", ns : null,
value : errorMessage);
await xmlWriter.WriteEndElementAsync();
}
}
return(-1);
}
}
catch (Exception e)
{
if (writer != null)
{
var message = RemoveNewLines(e.ToString());
writer.LogAsync(Severity.Error, string.Format("Exception during execution: name={0} | {1}", name, message)).Wait();
}
}
finally
{
if (writer != null)
{
writer.CompleteAsync().Wait();
}
}
await writer.LogAsync(Severity.Error, string.Format("Exception during execution: Invalid arguments: name={0}", name));
return(-1);
}
/// <summary>
/// Performs the action specified by the <paramref name="args"/> parameter.
/// </summary>
/// <param name="args">
/// Command-line arguments provided by Splunk when it invokes the
/// modular input program. Implementers should pass the arguments to
/// the main method of the program as the value of this parameter.
/// </param>
/// <returns>
/// A value which should be used as the exit code from the modular
/// input program. A value of <c>0</c> indicates success. A non-zero
/// value indicates failure.
/// </returns>
/// <remarks>
/// If the <paramref name="args"/> are not in the supported set of values,
/// the method will do nothing and return a non-zero value. Any
/// exceptions and internal progress messages encountered during
/// execution are written to the splunkd log file.
/// </remarks>
public async Task <int> RunAsync(string[] args,
TextReader stdin = null,
TextWriter stdout = null,
TextWriter stderr = null,
IProgress <EventWrittenProgressReport> progress = null)
{
if (progress == null)
{
progress = new Progress <EventWrittenProgressReport>();
}
/// Console default is OEM text encoding, which is not handled by Splunk,
//// resulting in loss of chars such as O with an umlaut (\u0150)
//// Splunk's default is UTF8.
if (stdin == null)
{
stdin = Console.In;
Console.InputEncoding = Encoding.UTF8;
}
if (stdout == null)
{
stdout = Console.Out;
Console.OutputEncoding = Encoding.UTF8;
}
if (stderr == null)
{
stderr = Console.Error;
Console.OutputEncoding = Encoding.UTF8;
}
EventWriter writer = new EventWriter(stdout, stderr, progress);
try
{
if (args.Length == 0)
{
List <Task> instances = new List <Task>();
InputDefinitionCollection inputDefinitions =
(InputDefinitionCollection) new XmlSerializer(typeof(InputDefinitionCollection)).
Deserialize(stdin);
foreach (InputDefinition inputDefinition in inputDefinitions)
{
instances.Add(this.StreamEventsAsync(inputDefinition, writer));
}
await Task.WhenAll(instances.ToArray());
return(0);
}
else if (args[0].ToLower().Equals("--scheme"))
{
Scheme scheme = this.Scheme;
if (scheme != null)
{
StringWriter stringWriter = new StringWriter();
new XmlSerializer(typeof(Scheme)).Serialize(stringWriter, scheme);
stdout.WriteLine(stringWriter.ToString());
return(0);
}
else
{
throw new NullReferenceException("Scheme was null; could not serialize.");
}
}
else if (args[0].ToLower().Equals("--validate-arguments"))
{
string errorMessage = null;
Validation validation = (Validation) new XmlSerializer(typeof(Validation)).
Deserialize(stdin);
try
{
bool validationSuccessful = true;
Scheme scheme = this.Scheme;
foreach (Argument arg in scheme.Arguments)
{
if (arg.ValidationDelegate != null)
{
if (!arg.ValidationDelegate(validation.Parameters[arg.Name], out errorMessage))
{
validationSuccessful = false;
break;
}
}
}
if (validationSuccessful && this.Validate(validation, out errorMessage))
{
return(0); // Validation succeeded
}
}
catch (Exception) { }
using (var xmlWriter = XmlWriter.Create(stdout, new XmlWriterSettings
{
Async = true,
ConformanceLevel = ConformanceLevel.Fragment
}))
{
await xmlWriter.WriteStartElementAsync(prefix : null, localName : "error", ns : null);
await xmlWriter.WriteElementStringAsync(prefix : null, localName : "message", ns : null, value : errorMessage);
await xmlWriter.WriteEndElementAsync();
}
return(-1);
}
else
{
await writer.LogAsync("ERROR", "Invalid arguments to modular input.");
return(-1);
}
}
catch (Exception e)
{
var full = e.ToString().Replace(Environment.NewLine, " | ");
writer.LogAsync(string.Format("Unhandled exception: {0}", full), "FATAL").Wait();
return(-1);
}
finally
{
writer.CompleteAsync().Wait();
}
}
