private static void GenerateExecutionLineForStep(Step step, PipelineFile pipelineFile, LinkedList <Step> currentExecutionLine, ISet <string> pathsTaken = null)
{
if (pathsTaken == null)
{
pathsTaken = new HashSet <string>();
}
foreach (var preStepName in step.PreStepNames)
{
if (preStepName == step.Name)
{
throw new StepSelfReferencesException($"Error! step \"{step.Name}\" references it self a a pre-step.");
}
var preStep = pipelineFile.Steps.SingleOrDefault(x => x.Name == preStepName);
if (preStep == null)
{
throw new StepNotDefinedException($"Error! step \"{step.Name}\" references pre-step \"{preStepName}\" which is not defined in the file.");
}
var path = string.Join("-->", step.Name, preStep.Name);
if (pathsTaken.Contains(path))
{
throw new StepCircularReferenceException($"Error! Circular step reference caused by \"{step.Name}\" referencing pre-step \"{preStep.Name}\" which ends up re-entroducing step \"{step.Name}\" and its pre-steps.");
}
pathsTaken.Add(path);
GenerateExecutionLineForStep(preStep, pipelineFile, currentExecutionLine, pathsTaken);
}
currentExecutionLine.AddLast(step);
}
private PipelineFile ReadPipelineFileFrom(string pipelineFilePath)
{
var fileContent = _fileSystem.ReadFileContents(pipelineFilePath);
return(PipelineFile.Parse(fileContent));
}
private static IEnumerable <Step> BuildExecutionPipelineFrom(IEnumerable <string> requestedSteps, PipelineFile pipelineFile)
{
var executionPipeline = new LinkedList <Step>();
foreach (var step in requestedSteps)
{
var existingStep = pipelineFile.Steps.SingleOrDefault(x => x.Name == step);
if (existingStep == null)
{
throw new StepNotDefinedException($"Error! Requested step \"{step}\" is not defined in the file.");
}
GenerateExecutionLineForStep(existingStep, pipelineFile, executionPipeline);
}
// default to first step defined in file if nothing has been specified on command line
if (executionPipeline.Count == 0)
{
executionPipeline.AddLast(pipelineFile.Steps.First());
}
return(executionPipeline);
}
private static Dictionary <string, string> BuildFinalVariablesFrom(IEnumerable <KeyValuePair <string, string> > variables, PipelineFile pipelineFile)
{
var finalVariables = new Dictionary <string, string>(variables);
foreach (var(key, value) in pipelineFile.Variables)
{
if (!finalVariables.ContainsKey(key))
{
finalVariables.Add(key, value);
}
}
return(finalVariables);
}