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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Sessions.VNCache
* File: WebSession.cs
*
* WebSession.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 VNLib.Net.Http;
using VNLib.Plugins.Essentials.Sessions;
using VNLib.Plugins.Essentials.Extensions;
using VNLib.Plugins.Sessions.Cache.Client;
using static VNLib.Plugins.Essentials.Sessions.ISessionExtensions;
namespace VNLib.Plugins.Sessions.VNCache
{
internal class WebSession : RemoteSession
{
protected const ulong UPGRADE_MSK = 0b0000000000010000UL;
protected readonly Func<IHttpEvent, string, string> UpdateId;
private string? _oldId;
public WebSession(string sessionId, IRemoteCacheStore client, TimeSpan backgroundTimeOut, Func<IHttpEvent, string, string> UpdateId)
: base(sessionId, client, backgroundTimeOut)
{
this.UpdateId = UpdateId;
}
protected override void IndexerSet(string key, string value)
{
//Set value
base.IndexerSet(key, value);
switch (key)
{
//Set the upgrade flag when token data is modified
case LOGIN_TOKEN_ENTRY:
case TOKEN_ENTRY:
Flags.Set(UPGRADE_MSK);
break;
}
}
public override async Task WaitAndLoadAsync(IHttpEvent entity, CancellationToken cancellationToken)
{
//Wait for the session to load
await base.WaitAndLoadAsync(entity, cancellationToken);
//If the session is new, set to web mode
if (IsNew)
{
SessionType = SessionType.Web;
}
}
private async Task ProcessUpgradeAsync()
{
//Setup timeout cancellation for the update, to cancel it
using CancellationTokenSource cts = new(UpdateTimeout);
await Client.AddOrUpdateObjectAsync(_oldId!, SessionID, DataStore, cts.Token);
_oldId = null;
}
protected override ValueTask<Task?> UpdateResource(bool isAsync, IHttpEvent state)
{
Task? result = null;
//Check flags in priority level, Invalid is highest state priority
if (Flags.IsSet(INVALID_MSK))
{
//Clear all stored values
DataStore!.Clear();
//Reset ip-address
UserIP = state.Server.GetTrustedIp();
//Update created time
Created = DateTimeOffset.UtcNow;
//Init the new session-data
this.InitNewSession(state.Server);
//Restore session type
SessionType = SessionType.Web;
//generate new session-id and update the record in the store
_oldId = SessionID;
//Update the session-id
SessionID = UpdateId(state, _oldId);
//write update to server
result = Task.Run(ProcessUpgradeAsync);
}
else if (Flags.IsSet(UPGRADE_MSK | REGEN_ID_MSK))
{
//generate new session-id and update the record in the store
_oldId = SessionID;
//Update the session-id
SessionID = UpdateId(state, _oldId);
//Update created time
Created = DateTimeOffset.UtcNow;
//write update to server
result = Task.Run(ProcessUpgradeAsync);
}
else if (Flags.IsSet(MODIFIED_MSK))
{
//Send update to server
result = Task.Run(ProcessUpdateAsync);
}
//Clear all flags
Flags.ClearAll();
return ValueTask.FromResult<Task?>(null);
}
}
}
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