/// <summary>
/// Runs one step of the pipeline using propertyBag as the pipeline input
/// Saves last outputed object
/// Saves whether the pipeline returned 0 or 1 object
/// throws exception if pipeline outputed more than 1 object
/// <param name="propertyBag">The property bag to run the powershell script's pipeline on</param>
public void StepPipeline(
IFsrmPropertyBag propertyBag
)
{
ResetRuleResults();
m_waitHandleIndex lockIndex;
bool readAValue = false;
bool tooManyValues = false;
m_ruleNoApply = false;
// insert the property bag into the pipeline after adding the GetStream Method
PSObject psPropertyBag = new PSObject(propertyBag);
psPropertyBag.Methods.Add(new PSCodeMethod("GetStream", m_getStreamMethodInfo));
m_propertyBagWriter.InsertData(psPropertyBag);
// wait for either the pipeline to close or
// for another property to be requested from the enumerator
// If for input a in the script value 1 is emitted, it must be emitted before value b is requested
// Handle multiple values being emitted but fail the current property bag if it happens
do
{
lockIndex = (m_waitHandleIndex)WaitHandle.WaitAny(m_powershellPaused);
//pipeline terminated unexpectedly save message and restart it
if (m_pipeLine.Output.EndOfPipeline)
{
string message;
if (m_pipeLine.PipelineStateInfo.State == PipelineState.Failed)
{
message = string.Format(CultureInfo.InvariantCulture,
"Powershell Classifier terminated abruptly due to failuer while processing file [{0}] in rule [{1}] - failure details: [{2}]",
propertyBag.VolumeName + propertyBag.RelativePath + "\\" + propertyBag.Name,
m_ruleName,
m_pipeLine.PipelineStateInfo.Reason.Message);
}
else
{
message = string.Format(CultureInfo.InvariantCulture,
"Powershell Classifier exited abruptly without failures while processing file [{0}] in rule [{1}].",
propertyBag.VolumeName + propertyBag.RelativePath + "\\" + propertyBag.Name,
m_ruleName);
}
propertyBag.AddMessage(message);
CreateAndBeginPipeline();
throw new COMException(message, m_pipeLine.PipelineStateInfo.Reason);
}
// if we haven't read a value pop one off and save it
if (m_pipeLine.Output.Count >= 1 && !readAValue)
{
readAValue = true;
m_propertyValue = m_pipeLine.Output.Read();
}
// if we have read a value and there are values in the pipeline, then
// set the tooManyValues flag and eat everythign in the pipeline
while (m_pipeLine.Output.Count > 0 && readAValue)
{
// if the m_propertyValue currently points to the first value ouput for the pipeline
// the add a message for it, other wise output messages for duplicate values after popping them off
if (!tooManyValues)
{
string message1 = string.Format(CultureInfo.InvariantCulture,
"Powershell Classifier returned too many values while processing file [{0}] in rule [{1}] - returned object of type [{2}], and value [{3}]",
propertyBag.VolumeName + propertyBag.RelativePath + "\\" + propertyBag.Name,
m_ruleName,
m_propertyValue.BaseObject.GetType().ToString(),
m_propertyValue.BaseObject.ToString());
propertyBag.AddMessage(message1);
}
// cleanup pipeline
m_propertyValue = m_pipeLine.Output.Read();
// ouput message for current object
string message2 = string.Format(CultureInfo.InvariantCulture,
"Powershell Classifier returned too many values while processing file [{0}] in rule [{1}] - returned object of type [{2}], and value [{3}]",
propertyBag.VolumeName + propertyBag.RelativePath + "\\" + propertyBag.Name,
m_ruleName,
m_propertyValue.BaseObject.GetType().ToString(),
m_propertyValue.BaseObject.ToString());
propertyBag.AddMessage(message2);
tooManyValues = true;
}
} while (lockIndex != m_waitHandleIndex.Enumerator && m_pipeLine.Output.IsOpen);
// if script didn't output any values for this property bag record it
if (!readAValue)
{
m_ruleNoApply = true;
}
// if output too many values finish failing this property
if (tooManyValues)
{
//already added messages for reason why we are failing
string message3 = string.Format(CultureInfo.InvariantCulture,
"Powershell Classifier returned too many values while processing file [{0}] in rule [{1}]",
propertyBag.VolumeName + propertyBag.RelativePath + "\\" + propertyBag.Name,
m_ruleName);
throw new COMException(message3, HRESULTS.PS_CLS_E_TOO_MANY_VALUES);
}
// if there were errors in the pipeline pop them all off and then fail current property bag
if (m_pipeLine.Error.Count > 0)
{
Exception firstError = null;
while (m_pipeLine.Error.Count > 0)
{
Exception exception = (Exception)m_pipeLine.Error.Read();
if (firstError == null)
{
firstError = exception;
}
// add message to pipeline
propertyBag.AddMessage(exception.Message);
}
throw (Exception)firstError;
}
}
