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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Sessions.VNCache
* File: WebSessionStore.cs
*
* WebSessionStore.cs is part of VNLib.Plugins.Essentials.Sessions.VNCache which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.Sessions.VNCache is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Essentials.Sessions.VNCache is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Threading.Tasks;
using System.Collections.Generic;
using VNLib.Net.Http;
using VNLib.Hashing;
using VNLib.Utils.Logging;
using VNLib.Data.Caching;
using VNLib.Plugins.Extensions.Loading;
using VNLib.Plugins.Sessions.Cache.Client;
using VNLib.Plugins.Extensions.VNCache;
using VNLib.Plugins.Essentials.Sessions;
namespace VNLib.Plugins.Sessions.VNCache
{
[ConfigurationName(WebSessionProviderEntry.WEB_SESSION_CONFIG)]
internal sealed class WebSessionStore : SessionStore<WebSession>
{
private ILogProvider? baseLog;
protected override ISessionIdFactory IdFactory { get; }
protected override IRemoteCacheStore Cache { get; }
protected override ISessionFactory<WebSession> SessionFactory { get; }
protected override ILogProvider Log => baseLog!;
public WebSessionStore(PluginBase pbase, IConfigScope config)
{
//Get id factory
IdFactory = pbase.GetOrCreateSingleton<WebSessionIdFactory>();
//Session factory
SessionFactory = new WebSessionFactory();
/*
* Init prefixed cache, a prefix key is required from
* the config
*/
string cachePrefix = config["cache_prefix"].GetString()
?? throw new KeyNotFoundException($"Missing required element 'cache_prefix' for config '{WebSessionProviderEntry.WEB_SESSION_CONFIG}'");
//Create a simple prefix cache provider
IGlobalCacheProvider cache = pbase.GetOrCreateSingleton<VnGlobalCache>()
.GetPrefixedCache(cachePrefix, HashAlg.SHA256);
//Create cache store from global cache
Cache = new GlobalCacheStore(cache);
//Default log to plugin log
baseLog = pbase.Log;
}
public void InitLog(ILogProvider log)
{
baseLog = log;
}
/// <summary>
/// A value that indicates if the remote cache client is connected
/// </summary>
public bool IsConnected => Cache.IsConnected;
public override ValueTask ReleaseSessionAsync(WebSession session, IHttpEvent entity)
{
//Get status flags first
SessionStatus status = session.GetStatus();
//If status is delete, we need to invalidate the session, and copy its security information
if(status.HasFlag(SessionStatus.Delete))
{
//Run delete/cleanup
Task delete = DeleteSessionAsync(session);
//Regenid and create new session
string newId = IdFactory.RegenerateId(entity);
//Get new session empty session for the connection
WebSession newSession = SessionFactory.GetNewSession(entity, newId, null);
//Reset security information for new session
newSession.InitNewSession(entity.Server);
IDictionary<string, string> data = newSession.GetSessionData();
//commit session to cache
Task add = Cache.AddOrUpdateObjectAsync(newId, null, data);
/*
* Call complete on session for good practice, this SHOULD be
* called after the update has been awaited though.
*
* We also do not need to use the mutal exclusion mechanism because
* no other connections should have this session's id yet.
*/
newSession.SessionUpdateComplete();
//Await the invalidation async
return new(AwaitInvalidate(delete, add));
}
else
{
return base.ReleaseSessionAsync(session, entity);
}
}
private static async Task AwaitInvalidate(Task delete, Task addNew)
{
try
{
await Task.WhenAll(delete, addNew);
}
catch (OperationCanceledException)
{
throw;
}
catch (SessionException)
{
throw;
}
catch(Exception ex)
{
throw new SessionException("An exception occured during session invalidation", ex);
}
}
}
}
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