/// <summary>
/// Create a new instance of a python algorithm
/// </summary>
/// <param name="assemblyPath"></param>
/// <param name="algorithmInstance"></param>
/// <param name="errorMessage"></param>
/// <returns></returns>
private bool TryCreatePythonAlgorithm(string assemblyPath, out IAlgorithm algorithmInstance, out string errorMessage)
{
algorithmInstance = null;
errorMessage = string.Empty;
//File does not exist.
if (!File.Exists(assemblyPath))
{
errorMessage = $"Loader.TryCreatePythonAlgorithm(): Unable to find py file: {assemblyPath}";
return(false);
}
try
{
var pythonFile = new FileInfo(assemblyPath);
var moduleName = pythonFile.Name.Replace(".pyc", "").Replace(".py", "");
//Help python find the module
Environment.SetEnvironmentVariable("PYTHONPATH", pythonFile.DirectoryName);
// Initialize Python Engine
if (!PythonEngine.IsInitialized)
{
PythonEngine.Initialize();
PythonEngine.BeginAllowThreads();
}
// Import Python module
using (Py.GIL())
{
Log.Trace($"Loader.TryCreatePythonAlgorithm(): Python version {PythonEngine.Version}");
Log.Trace($"Loader.TryCreatePythonAlgorithm(): Importing python module {moduleName}");
var module = Py.Import(moduleName);
if (module == null)
{
errorMessage = $"Loader.TryCreatePythonAlgorithm(): Unable to import python module {assemblyPath}. Check for errors in the python scripts.";
return(false);
}
Log.Trace("Loader.TryCreatePythonAlgorithm(): Creating IAlgorithm instance.");
algorithmInstance = new AlgorithmPythonWrapper(module);
ObjectActivator.SetPythonModule(module);
}
}
catch (Exception e)
{
Log.Error(e);
errorMessage = $"Loader.TryCreatePythonAlgorithm(): Unable to import python module {assemblyPath}. {e.Message}";
}
//Successful load.
return(algorithmInstance != null);
}
/// <summary>
/// Create a new instance of a python algorithm
/// </summary>
/// <param name="assemblyPath"></param>
/// <param name="algorithmInstance"></param>
/// <param name="errorMessage"></param>
/// <returns></returns>
private bool TryCreatePythonAlgorithm(string assemblyPath, out IAlgorithm algorithmInstance, out string errorMessage)
{
algorithmInstance = null;
errorMessage = string.Empty;
//File does not exist.
if (!File.Exists(assemblyPath))
{
errorMessage = "Loader.TryCreatePythonAlgorithm(): Unable to find py file: " + assemblyPath;
return(false);
}
try
{
//Copy the util to cache and set the
var cache = new FileInfo(assemblyPath).DirectoryName;
var util = Path.Combine(cache, "AlgorithmPythonUtil.py");
if (!File.Exists(util))
{
File.Copy("AlgorithmPythonUtil.py", util);
}
//Help python find the module
Environment.SetEnvironmentVariable("PYTHONPATH", cache);
// Initialize Python Engine
if (!PythonEngine.IsInitialized)
{
PythonEngine.Initialize();
PythonEngine.BeginAllowThreads();
}
// Import Python module
using (Py.GIL())
{
Log.Trace("Loader.TryCreatePythonAlgorithm(): Locating module name..");
var pythonFile = new FileInfo(assemblyPath);
var moduleName = pythonFile.Name.Replace(".pyc", "").Replace(".py", "");
Log.Trace("Loader.TryCreatePythonAlgorithm(): Importing python module " + moduleName);
var module = Py.Import(moduleName);
if (module == null)
{
errorMessage = "Loader.TryCreatePythonAlgorithm(): Unable to import python module " + assemblyPath + ". Check for errors in the python scripts.";
return(false);
}
Log.Trace("Loader.TryCreatePythonAlgorithm(): Creating IAlgorithm instance.");
algorithmInstance = new AlgorithmPythonWrapper(module);
ObjectActivator.SetPythonModule(module);
}
}
catch (Exception e)
{
Log.Error(e);
errorMessage = "Loader.TryCreatePythonAlgorithm(): Unable to import python module " + assemblyPath + ". " + e.Message;
}
//Successful load.
return(algorithmInstance != null);
}
