/// <summary>
/// run the python code in a task
/// </summary>
private void RunTask()
{
PythonRunResult result = new PythonRunResult();
Task task = Task.Factory.StartNew(() => {
result = RunProcess();
//remove the custom output allowing us to extract variables from python
CleanStdout();
if (runInBackground)
{
onTaskEnd?.Invoke(this, result);
}
});
if (!runInBackground)
{
task.Wait();
onTaskEnd?.Invoke(this, result);
}
}
/// <summary>
/// convert the string received from python to a PythonRunResult
/// </summary>
/// <param name="result">output of stdout</param>
/// <param name="error">output of stderr</param>
/// <returns></returns>
private PythonRunResult InterpretResult(string result, string error)
{
//first check if there is and error if so stop
if (!string.IsNullOrWhiteSpace(error))
{
//return run result with the traceback python gave us
return(new PythonRunResult()
{
hasError = true,
errorString = error
});
}
//if the result (stdout) is empty then something wrong happened
//same if the result doesn't contain what our custom code printed
if (string.IsNullOrWhiteSpace(result) || !result.Contains("ENDUSEROUTPUT"))
{
//no stdout that means the process was killed before finishing
//or if there is no "ENDUSEROUTPUT" that means out custom code didn't have time to run
return(new PythonRunResult()
{
hasError = true,
errorString = "the python process was killed"
});
}
//from there on we are sure the process finished sucessfully
//split where the python printed "ENDUSEROUTPUT", this should only have been printed once
//therefore the string[] should only have 2 elements in it
string[] resultArr = result.Split(new string[] { "ENDUSEROUTPUT" }, StringSplitOptions.None);
//if it doesn't have only 2 elements that means the user printed "ENDUSEROUTPUT" himself (weirdo)
if (resultArr.Length != 2)
{
//return run result with custom error message
PythonRunResult pythonRunResult = new PythonRunResult()
{
hasError = true,
errorString = "You can't print \"ENDUSEROUTPUT\", or an unexpected case happened"
};
return(pythonRunResult);
}
else
{
//return run result without and error and a hashtable filled with the extracted variables
Dictionary <string, object> table = new Dictionary <string, object>();
//the output will look something like this : "outVal1=5|outVal2=value"
//each var is separated by a |
string[] vars = resultArr[1].Split('|');
for (int i = 0; i < vars.Length; i++)
{
string[] thisVar = vars[i].Split('=');
//thisVar[0] = varName
//thisVar[1] = varValue
table.Add(thisVar[0], TryConvert(thisVar[1]));
}
PythonRunResult pythonRunResult = new PythonRunResult()
{
hasError = false,
returnedValues = table
};
return(pythonRunResult);
}
}
