/// <summary>
/// 将给定的 SubmissionLanguage 枚举值转换为对应的字符串。
/// </summary>
/// <param name="value">要转换的 SubmissionLanguage 枚举值。</param>
/// <returns>转换后的字符串。</returns>
/// <exception cref="ArgumentException"/>
public static string ConvertToString(SubmissionLanguage value)
{
switch (value)
{
case SubmissionLanguage.GnuC:
return(GnuCString);
case SubmissionLanguage.GnuCPlusPlus:
return(GnuCPlusPlusString);
case SubmissionLanguage.GnuCPlusPlus11:
return(GnuCPlusPlus11String);
case SubmissionLanguage.GnuCPlusPlus14:
return(GnuCPlusPlus14String);
case SubmissionLanguage.GnuCPlusPlus17:
return(GnuCPlusPlus17String);
case SubmissionLanguage.MicrosoftCPlusPlus:
return(MicrosoftCPlusPlusString);
case SubmissionLanguage.Java:
return(JavaString);
case SubmissionLanguage.Pascal:
return(PascalString);
case SubmissionLanguage.Python2:
return(Python2String);
case SubmissionLanguage.Python3:
return(Python3String);
default:
throw new ArgumentException("给定的 SubmissionLanguage 枚举值无效。");
}
}
public async Task <UserExerciseSubmission> AddUserExerciseSubmission(
string courseId, Guid slideId,
string code, string compilationError, string output,
string userId, string executionServiceName, string displayName,
SubmissionLanguage language,
AutomaticExerciseCheckingStatus status = AutomaticExerciseCheckingStatus.Waiting)
{
if (string.IsNullOrWhiteSpace(code))
{
code = "// no code";
}
var hash = (await textsRepo.AddText(code)).Hash;
var compilationErrorHash = (await textsRepo.AddText(compilationError)).Hash;
var outputHash = (await textsRepo.AddText(output)).Hash;
AutomaticExerciseChecking automaticChecking;
if (language.HasAutomaticChecking())
{
automaticChecking = new AutomaticExerciseChecking
{
CourseId = courseId,
SlideId = slideId,
UserId = userId,
Timestamp = DateTime.Now,
CompilationErrorHash = compilationErrorHash,
IsCompilationError = !string.IsNullOrWhiteSpace(compilationError),
OutputHash = outputHash,
ExecutionServiceName = executionServiceName,
DisplayName = displayName,
Status = status,
IsRightAnswer = false,
};
db.AutomaticExerciseCheckings.Add(automaticChecking);
}
else
{
automaticChecking = null;
}
var submission = new UserExerciseSubmission
{
CourseId = courseId,
SlideId = slideId,
UserId = userId,
Timestamp = DateTime.Now,
SolutionCodeHash = hash,
CodeHash = code.Split('\n').Select(x => x.Trim()).Aggregate("", (x, y) => x + y).GetHashCode(),
Likes = new List <Like>(),
AutomaticChecking = automaticChecking,
AutomaticCheckingIsRightAnswer = automaticChecking?.IsRightAnswer ?? true,
Language = language,
};
db.UserExerciseSubmissions.Add(submission);
await db.SaveChangesAsync();
return(submission);
}
private async Task <UserExerciseSubmission> TryGetExerciseSubmission(string agentName, SubmissionLanguage language)
{
var notSoLongAgo = DateTime.Now - TimeSpan.FromMinutes(15);
UserExerciseSubmission submission;
using (var transaction = db.Database.BeginTransaction(IsolationLevel.Serializable))
{
var submissionsQueryable = db.UserExerciseSubmissions
.AsNoTracking()
.Where(s =>
s.Timestamp > notSoLongAgo &&
s.AutomaticChecking.Status == AutomaticExerciseCheckingStatus.Waiting &&
s.Language == language);
if (!submissionsQueryable.Any())
{
return(null);
}
var maxId = submissionsQueryable.Select(s => s.Id).DefaultIfEmpty(-1).Max();
submission = submissionsQueryable.FirstOrDefault(s => s.Id == maxId);
if (submission == null)
{
return(null);
}
/* Mark submission as "running" */
submission.AutomaticChecking.Status = AutomaticExerciseCheckingStatus.Running;
submission.AutomaticChecking.CheckingAgentName = agentName;
await SaveAll(new List <AutomaticExerciseChecking> {
submission.AutomaticChecking
});
transaction.Commit();
db.ObjectContext().AcceptAllChanges();
}
unhandledSubmissions.TryRemove(submission.Id, out _);
return(submission);
}
public async Task <UserExerciseSubmission> GetUnhandledSubmission(string agentName, SubmissionLanguage language)
{
log.Info("GetUnhandledSubmission(): trying to acquire semaphore");
var semaphoreLocked = await getSubmissionSemaphore.WaitAsync(TimeSpan.FromSeconds(2));
if (!semaphoreLocked)
{
log.Error("GetUnhandledSubmission(): Can't lock semaphore for 2 seconds");
return(null);
}
log.Info("GetUnhandledSubmission(): semaphore acquired!");
try
{
return(await TryGetExerciseSubmission(agentName, language));
}
catch (Exception e)
{
log.Error("GetUnhandledSubmission() error", e);
return(null);
}
finally
{
log.Info("GetUnhandledSubmission(): trying to release semaphore");
getSubmissionSemaphore.Release();
log.Info("GetUnhandledSubmission(): semaphore released");
}
}
public static bool HasAutomaticChecking(this SubmissionLanguage language)
{
/* For a while only C# has automatic checking on ulearn */
return(language == SubmissionLanguage.CSharp);
}
private async Task <List <UserExerciseSubmission> > TryGetExerciseSubmissions(int count, string agentName, SubmissionLanguage language)
{
var notSoLongAgo = DateTime.Now - TimeSpan.FromMinutes(15);
List <UserExerciseSubmission> submissions;
using (var transaction = db.Database.BeginTransaction(IsolationLevel.Serializable))
{
submissions = db.UserExerciseSubmissions
.AsNoTracking()
.Where(s =>
s.Timestamp > notSoLongAgo &&
s.AutomaticChecking.Status == AutomaticExerciseCheckingStatus.Waiting &&
s.Language == language)
.OrderByDescending(s => s.Timestamp)
.Take(count)
.ToList();
foreach (var submission in submissions)
{
submission.AutomaticChecking.Status = AutomaticExerciseCheckingStatus.Running;
submission.AutomaticChecking.CheckingAgentName = agentName;
}
await SaveAll(submissions.Select(s => s.AutomaticChecking));
transaction.Commit();
db.ObjectContext().AcceptAllChanges();
}
foreach (var submission in submissions)
{
unhandledSubmissions.TryRemove(submission.Id, out _);
}
return(submissions);
}