async Task BuildTransition <T>(WorkflowData workflow, T source, T target, Transition data, Func <T, IInstanceNode> nodegetter)
{
IScript condition = string.IsNullOrEmpty(data.Condition) ? null : await compiler.CompileCodeAsync(data.Condition, data.Language ?? workflow.Language ?? ScriptLanguage.NCScript);
List <InstanceTransition> transitions;
switch (data.Type)
{
case TransitionType.Standard:
transitions = nodegetter(source).Transitions;
break;
case TransitionType.Error:
transitions = nodegetter(source).ErrorTransitions;
break;
case TransitionType.Loop:
transitions = nodegetter(source).LoopTransitions;
break;
default:
throw new ArgumentException($"Invalid type '{data.Type}'");
}
transitions.Add(new InstanceTransition {
Target = nodegetter(target),
Condition = condition,
Log = string.IsNullOrEmpty(data.Log) ? null : await compiler.CompileCodeAsync(data.Log, data.Language ?? workflow.Language ?? ScriptLanguage.NCScript)
});
}
/// <inheritdoc />
public override async Task <object> Execute(WorkflowInstanceState state, CancellationToken token)
{
logparameter ??= await compiler.CompileCodeAsync(Parameters.Text, state.Language ?? ScriptLanguage.NCScript);
state.Logger.Log(Parameters.Type, await logparameter.ExecuteAsync <string>(state.Variables, token));
return(null);
}
async Task <IEnumerator> CreateEnumerator(WorkflowInstanceState state, CancellationToken token)
{
IScript enumerationscript = await compiler.CompileCodeAsync(Parameters.Collection, state.Language ?? ScriptLanguage.NCScript);
object collection = await enumerationscript.ExecuteAsync(state.Variables, token);
if (!(collection is IEnumerable enumerable))
{
throw new WorkflowException("Can not enumerate null");
}
return(enumerable.GetEnumerator());
}
/// <inheritdoc />
public async Task <WorkableTask> Execute(NamedCode code, IDictionary <string, object> variables = null, TimeSpan?wait = null)
{
IDictionary <string, object> runtimevariables = await variables.TranslateVariables(scriptcompiler, ScriptLanguage.NCScript);
WorkableTask scripttask = scriptinstances.CreateTask(WorkableType.Script, 0, 0, code.Name, runtimevariables);
try {
return(await Execute(await scriptcompiler.CompileCodeAsync(code.Code, code.Language), scripttask, runtimevariables, wait));
}
catch (Exception e) {
scripttask.Log.Add(e.ToString());
scripttask.Status = TaskStatus.Failure;
await scriptinstances.FinishTask(scripttask.Id);
}
return(scripttask);
}
/// <inheritdoc />
public override async Task <object> Execute(WorkflowInstanceState state, CancellationToken token)
{
expression ??= await compiler.CompileCodeAsync(GenerateCode(state.Language ?? ScriptLanguage.NCScript), state.Language ?? ScriptLanguage.NCScript);
object result = await expression.ExecuteAsync(state.Variables, token);
if (result is Task task)
{
await task;
PropertyInfo resultproperty = task.GetType().GetProperty("Result");
if (resultproperty != null)
{
return(resultproperty.GetValue(task));
}
return(null);
}
return(result);
}
/// <summary>
/// translates workable variables to parameter values
/// </summary>
/// <param name="variables">variables to translate</param>
/// <param name="compiler">compiler to use to parse variable scripts</param>
/// <returns>workable parameter variables</returns>
public static async Task <IDictionary <string, object> > TranslateVariables(this IDictionary <string, object> variables, IScriptCompiler compiler, ScriptLanguage?language)
{
if (variables == null)
{
return(null);
}
Dictionary <string, object> translated = new Dictionary <string, object>();
foreach (KeyValuePair <string, object> kvp in variables)
{
if (kvp.Value is string code)
{
translated[kvp.Key] = await(await compiler.CompileCodeAsync(code, language ?? ScriptLanguage.NCScript)).ExecuteAsync();
}
else
{
translated[kvp.Key] = kvp.Value;
}
}
return(translated);
}
/// <inheritdoc />
public override async Task <object> Execute(WorkflowInstanceState state, CancellationToken token)
{
if (Parameters?.Parameters?.Length > 0)
{
foreach (ParameterDeclaration parameter in Parameters.Parameters)
{
// not sure whether type specs are possible in every script language
Type type = (await compiler.CompileCodeAsync(parameter.Type, ScriptLanguage.NCScript)).Execute <Type>();
if (!state.Variables.TryGetValue(parameter.Name, out object parametervalue))
{
if (string.IsNullOrEmpty(parameter.Default))
{
throw new WorkflowException($"Missing required parameter '{parameter.Name}'");
}
parametervalue = await(await compiler.CompileCodeAsync(parameter.Default, state.Language ?? ScriptLanguage.NCScript)).ExecuteAsync(state.Variables, token);
}
if (parametervalue == null)
{
if (type.IsValueType)
{
throw new WorkflowException($"Unable to pass null to the value parameter '{parameter.Name}'");
}
state.Variables[parameter.Name] = null;
}
else
{
if (!type.IsInstanceOfType(parametervalue))
{
try {
if (type.IsArray)
{
Type elementtype = type.GetElementType();
if (parametervalue is IEnumerable enumeration)
{
object[] items = enumeration.Cast <object>().ToArray();
Array array = Array.CreateInstance(elementtype, items.Length);
int index = 0;
foreach (object item in items)
{
if (item is IDictionary dic)
{
array.SetValue(dic.ToType(elementtype), index++);
}
else
{
array.SetValue(Converter.Convert(item, elementtype), index++);
}
}
parametervalue = array;
}
else
{
Array array = Array.CreateInstance(elementtype, 1);
array.SetValue(Converter.Convert(parametervalue, elementtype), 0);
parametervalue = array;
}
}
else
{
if (parametervalue is IDictionary dic)
{
parametervalue = dic.ToType(type);
}
else if (parametervalue is IDictionary <string, object> expando)
{
parametervalue = expando.ToType(type);
}
else
{
parametervalue = Converter.Convert(parametervalue, type);
}
}
}
catch (Exception e) {
throw new WorkflowException($"Unable to convert parameter '{parametervalue}' to '{type.Name}'", e);
}
}
state.Variables[parameter.Name] = parametervalue;
}
}
}
return(Task.FromResult((object)null));
}
