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async locking for VikingSession

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Spirtix 2025-06-30 19:33:49 +02:00
parent bca383c4d0
commit 7dbcc456b9
1 changed files with 28 additions and 5 deletions
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33
src/Attributes/VikingSession.cs
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@ -1,5 +1,6 @@
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using sodoff.Model;
namespace sodoff.Attributes;
@ -12,6 +13,9 @@ public class VikingSession : Attribute, IAsyncActionFilter {
public Modes Mode { get; set; } = Modes.VIKING;
public bool UseLock = false;
private static Dictionary<string, SemaphoreSlim> semaphores = new();
private static SemaphoreSlim dictSemaphore = new(1, 1);
public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next) {
DBContext ctx = context.HttpContext.RequestServices.GetService(typeof(DBContext)) as DBContext;
@ -22,7 +26,7 @@ public class VikingSession : Attribute, IAsyncActionFilter {
return;
}
Session? session = ctx.Sessions.FirstOrDefault(x => x.ApiToken == Guid.Parse(context.HttpContext.Request.Form[ApiToken].ToString()));
Session? session = await ctx.Sessions.FirstOrDefaultAsync(x => x.ApiToken == Guid.Parse(context.HttpContext.Request.Form[ApiToken].ToString()));
// get viking / user id from session
@ -44,15 +48,16 @@ public class VikingSession : Attribute, IAsyncActionFilter {
// NOTE: we can't refer to session.User / session.Viking here,
// because it may cause to ignore modifications from the threads we are waiting for
// we can use its only after vikingMutex.WaitOne()
Mutex vikingMutex = new Mutex(false, "SoDOffViking:" + userVikingId);
string semKey = "SoDOffViking:" + userVikingId;
SemaphoreSlim semaphore = await GetSemaphore(semKey);
try {
vikingMutex.WaitOne();
await semaphore.WaitAsync();
context.ActionArguments["user"] = session.User;
context.ActionArguments["viking"] = session.Viking;
await next();
} finally {
vikingMutex.ReleaseMutex();
semaphore.Release();
await RemoveSemaphore(semKey, semaphore);
}
} else {
context.ActionArguments["user"] = session.User;
@ -60,4 +65,22 @@ public class VikingSession : Attribute, IAsyncActionFilter {
await next();
}
}
private static async Task<SemaphoreSlim> GetSemaphore(string key) {
await dictSemaphore.WaitAsync();
if (!semaphores.TryGetValue(key, out SemaphoreSlim semaphore)) {
semaphore = new SemaphoreSlim(1, 1);
semaphores.Add(key, semaphore);
}
dictSemaphore.Release();
return semaphore;
}
private static async Task RemoveSemaphore(string key, SemaphoreSlim sem) {
await dictSemaphore.WaitAsync();
if (sem.CurrentCount == 1) {
semaphores.Remove(key);
}
dictSemaphore.Release();
}
}