public async Task <ITaskResult> TryReadResultAsync(ServiceId serviceId, MethodId methodId, string intentId, Type resultValueType, CancellationToken ct)
{
var tableName = GetTableQualifiedName(serviceId, methodId);
var key = new StorageRecord
{
service = serviceId.Name,
method = methodId.Name,
intent_id = intentId
};
var query = new StringBuilder("SELECT status, outcome, format, task_result, result, error FROM ")
.Append(tableName).Append(" WHERE ");
WriteValues(query, key, delimiter: " AND ");
var result = await ExecuteQueryAsync(serviceId, methodId, query.ToString());
var row = result.FirstOrDefault();
if (row == null)
{
return(null);
}
var record = ReadValues(row);
if (!record.outcome.HasValue)
{
return(null);
}
if (record.outcome.Value == (int)Outcomes.Canceled)
{
return(TaskResult.Create(resultValueType, null, null, isCanceled: true));
}
var serializer = !string.IsNullOrEmpty(record.format)
? _serializerProvider.GetSerializer(record.format)
: _serializer;
var taskResult = TaskResult.CreateEmpty(resultValueType);
serializer.Populate(record.task_result, (IValueContainer)taskResult);
return(taskResult);
}
public static ITaskResult ToTaskResult(this Task task)
{
var status = task.Status;
if (status != TaskStatus.RanToCompletion && status != TaskStatus.Canceled && status != TaskStatus.Faulted)
{
throw new ArgumentException($"The task is not completed and is in '{status}' state.", nameof(task));
}
var exception = (task.Exception is AggregateException aggregateException && aggregateException.InnerExceptions?.Count == 1)
? aggregateException.InnerException
: task.Exception;
var valueType = task.GetResultType();
if (valueType == null ||
valueType == typeof(void) ||
valueType == TaskAccessor.VoidTaskResultType ||
valueType == typeof(object))
{
return(new TaskResult
{
Value = status == TaskStatus.RanToCompletion ? task.GetResult() : null,
Exception = status == TaskStatus.Faulted ? exception : null,
IsCanceled = status == TaskStatus.Canceled
});
}
else
{
return(TaskResult.Create(
valueType,
status == TaskStatus.RanToCompletion ? task.GetResult() : null,
status == TaskStatus.Faulted ? exception : null,
status == TaskStatus.Canceled));
}
}