public void Execute(string code)
{
using (var cts = new CancellationTokenSource((int)Timeout * 1000))
{
try
{
var request = new PythonRequest()
{
RequestType = RequestType.Execute,
Code = code
};
PythonResponse response = RequestAsync(request, cts.Token);
cts.Token.ThrowIfCancellationRequested();
response.ThrowExceptionIfNeeded();
}
catch (Exception e)
{
if (cts.IsCancellationRequested)
{
throw new TimeoutException(UiPath_Python.TimeoutException);
}
Trace.TraceError($"Python exception: {e}");
throw;
}
}
}
public List <Prediction> ParseResponse(PythonResponse pythonResponse)
{
var rawStrings = pythonResponse.Results.Split("\r\n\r\n");
rawStrings = rawStrings.Take(rawStrings.Length - 1).ToArray();
return(rawStrings.Select(x => new Prediction(x)).ToList());
}
/// <summary>
/// Writes the serialized Python request to the named pipe. Waits from the request to be read on Python side.
/// Then reads the response from python(json) an deserializes it to PythonRespnse
/// </summary>
/// <param name="request"></param>
/// <param name="ct"></param>
/// <returns></returns>
public PythonResponse RequestAsync(PythonRequest request, CancellationToken ct)
{
using (CancellationTokenRegistration ctr = ct.Register(() => OnCancellationRequested()))
{
using (var streamWriter = new StreamWriter(ClientStream, _utf8Encoding, _defaultBufferSize,
leaveOpen: true)
{
AutoFlush = true
})
{
Trace.TraceInformation("Sending information to Python.");
streamWriter.WriteLine(request.Serialize());
}
ct.ThrowIfCancellationRequested();
bool isWindows = true;
#if NETCOREAPP
if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
isWindows = false;
}
#endif
if (isWindows)
{
ClientStream.WaitForPipeDrain();
}
using (var streamReader = new StreamReader(ClientStream, _utf8Encoding, false, _defaultBufferSize,
leaveOpen: true))
{
return(PythonResponse.Deserialize(streamReader.ReadLine()));
}
}
}
public Argument Convert(Guid obj, string t)
{
using (var cts = new CancellationTokenSource((int)Timeout * 1000))
{
try
{
var request = new PythonRequest()
{
RequestType = RequestType.Convert,
Instance = obj,
Type = t
};
PythonResponse response = RequestAsync(request, cts.Token);
cts.Token.ThrowIfCancellationRequested();
response.ThrowExceptionIfNeeded();
return(response.Argument);
}
catch (Exception e)
{
if (cts.IsCancellationRequested)
{
throw new TimeoutException(UiPath_Python.TimeoutException);
}
Trace.TraceError($"Python exception: {e}");
throw;
}
}
}
public Guid LoadScript(string code)
{
using (var cts = new CancellationTokenSource((int)Timeout * 1000))
{
try
{
var request = new PythonRequest()
{
RequestType = RequestType.LoadScript,
Code = code
};
PythonResponse response = RequestAsync(request, cts.Token);
cts.Token.ThrowIfCancellationRequested();
Trace.TraceInformation("LoadScript Guid:: " + response.Guid);
return(response.Guid);
}
catch (Exception e)
{
if (cts.IsCancellationRequested)
{
throw new TimeoutException(UiPath_Python.TimeoutException);
}
Trace.TraceError($"Python exception: {e}");
throw;
}
}
}
public Guid InvokeMethod(Guid instance, string method, IEnumerable <Argument> args)
{
using (var cts = new CancellationTokenSource((int)Timeout * 1000))
{
try
{
var request = new PythonRequest()
{
RequestType = RequestType.InvokeMethod,
Instance = instance,
Method = method,
Arguments = args
};
PythonResponse response = RequestAsync(request, cts.Token);
cts.Token.ThrowIfCancellationRequested();
response.ThrowExceptionIfNeeded();
return(response.Guid);
}
catch (Exception e)
{
if (cts.IsCancellationRequested)
{
throw new TimeoutException(UiPath_Python.TimeoutException);
}
Trace.TraceError($"Python exception: {e}");
throw;
}
}
}
public void Initialize(string path, string libraryPath, Version version, string workingFolder)
{
using (var cts = new CancellationTokenSource((int)Timeout * 1000))
{
try
{
var request = new PythonRequest()
{
RequestType = RequestType.Initialize,
ScriptPath = path,
LibraryPath = libraryPath,
PythonVersion = version.ToString(),
WorkingFolder = workingFolder
};
PythonResponse response = RequestAsync(request, Token);
Token.ThrowIfCancellationRequested();
response.ThrowExceptionIfNeeded();
}
catch (Exception e)
{
if (cts.IsCancellationRequested)
{
throw new TimeoutException(UiPath_Python.TimeoutException);
}
Trace.TraceError($"Python exception: {e}");
throw;
}
}
}
public void Shutdown()
{
using (var cts = new CancellationTokenSource((int)Timeout * 1000))
{
var request = new PythonRequest()
{
RequestType = RequestType.Shutdown
};
PythonResponse response = RequestAsync(request, cts.Token);
cts.Token.ThrowIfCancellationRequested();
}
}
internal async void RunServer()
{
PythonResponse response = new PythonResponse
{
ResultState = ResultState.Successful
};
pipeName = Process.GetCurrentProcess().Id.ToString();
pipeServer = new NamedPipeServerStream(pipeName, PipeDirection.InOut, 1, PipeTransmissionMode.Byte,
PipeOptions.Asynchronous);
pipeServer.WaitForConnection();
using (var streamReader = new StreamReader(pipeServer, _utf8Encoding, false, _defaultBufferSize,
leaveOpen: true))
using (var streamWriter = new StreamWriter(pipeServer, _utf8Encoding, _defaultBufferSize,
leaveOpen: true)
{
AutoFlush = true
})
while (true)
{
try
{
var request = PythonRequest.Deserialize(await streamReader.ReadLineAsync());
switch (request.RequestType)
{
case RequestType.Initialize:
Initialize(request.ScriptPath, request.LibraryPath, (Version)Enum.Parse(typeof(Version), request.PythonVersion), request.WorkingFolder);
response.ResultState = ResultState.Successful;
streamWriter.WriteLine(response.Serialize());
break;
case RequestType.Shutdown:
response = new PythonResponse
{
ResultState = ResultState.Successful
};
streamWriter.WriteLine(response.Serialize());
Shutdown();
break;
case RequestType.Execute:
Execute(request.Code);
response = new PythonResponse
{
ResultState = ResultState.Successful
};
streamWriter.WriteLine(response.Serialize());
break;
case RequestType.LoadScript:
var guid = LoadScript(request.Code);
response = new PythonResponse
{
ResultState = ResultState.Successful,
Guid = guid
};
streamWriter.WriteLine(response.Serialize());
break;
case RequestType.InvokeMethod:
var guidI = InvokeMethod(request.Instance, request.Method, request.Arguments);
response = new PythonResponse
{
ResultState = ResultState.Successful
};
response.Guid = guidI;
streamWriter.WriteLine(response.Serialize());
break;
case RequestType.Convert:
Argument arg = Convert(request.Instance, request.Type);
response = new PythonResponse
{
Argument = arg,
ResultState = ResultState.Successful
};
streamWriter.WriteLine(response.Serialize());
break;
default:
Shutdown();
break;
}
WaitForPipeDrain(pipeServer);
}
catch (Exception ex)
{
response = new PythonResponse
{
ResultState = ResultState.InstantiationException,
};
response.Errors = new List <string>();
response.Errors.Add(ex.Message);
streamWriter.WriteLine(response.Serialize());
WaitForPipeDrain(pipeServer);
throw;
}
}
}
