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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Sessions.VNCache
* File: WebSessionProviderEntry.cs
*
* WebSessionProviderEntry.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.Text.Json;
using VNLib.Net.Http;
using VNLib.Utils.Memory;
using VNLib.Utils.Logging;
using VNLib.Utils.Extensions;
using VNLib.Plugins.Extensions.Loading;
using VNLib.Plugins.Essentials.Sessions.Runtime;
using VNLib.Data.Caching.Extensions;
namespace VNLib.Plugins.Essentials.Sessions.VNCache
{
public sealed class WebSessionProviderEntry : IRuntimeSessionProvider
{
const string VNCACHE_CONFIG_KEY = "vncache";
const string WEB_SESSION_CONFIG = "web";
private WebSessionProvider? _sessions;
public bool CanProcess(IHttpEvent entity)
{
//Web sessions can always be provided so long as cache is loaded
return _sessions != null;
}
public ValueTask<SessionHandle> GetSessionAsync(IHttpEvent entity, CancellationToken cancellationToken)
{
return _sessions!.GetSessionAsync(entity, cancellationToken);
}
void IRuntimeSessionProvider.Load(PluginBase plugin, ILogProvider localized)
{
//Try get vncache config element
IReadOnlyDictionary<string, JsonElement> cacheConfig = plugin.GetConfig(VNCACHE_CONFIG_KEY);
IReadOnlyDictionary<string, JsonElement> webSessionConfig = plugin.GetConfig(WEB_SESSION_CONFIG);
uint cookieSize = webSessionConfig["cookie_size"].GetUInt32();
string cookieName = webSessionConfig["cookie_name"].GetString() ?? throw new KeyNotFoundException($"Missing required element 'cookie_name' for config '{WEB_SESSION_CONFIG}'");
string cachePrefix = webSessionConfig["cache_prefix"].GetString() ?? throw new KeyNotFoundException($"Missing required element 'cache_prefix' for config '{WEB_SESSION_CONFIG}'");
TimeSpan validFor = webSessionConfig["valid_for_sec"].GetTimeSpan(TimeParseType.Seconds);
//Init id factory
WebSessionIdFactoryImpl idFactory = new(cookieSize, cookieName, cachePrefix, validFor);
//Run client connection
_ = plugin.DeferTask(() => WokerDoWorkAsync(plugin, localized, idFactory, cacheConfig, webSessionConfig));
}
/*
* Starts and monitors the VNCache connection
*/
private async Task WokerDoWorkAsync(
PluginBase plugin,
ILogProvider localized,
WebSessionIdFactoryImpl idFactory,
IReadOnlyDictionary<string, JsonElement> cacheConfig,
IReadOnlyDictionary<string, JsonElement> webSessionConfig)
{
//Init cache client
using VnCacheClient cache = new(plugin.IsDebug() ? localized : null, Memory.Shared);
try
{
int cacheLimit = (int)webSessionConfig["cache_size"].GetUInt32();
uint maxConnections = webSessionConfig["max_waiting_connections"].GetUInt32();
//Try loading config
await cache.LoadConfigAsync(plugin, cacheConfig);
//Init provider
_sessions = new(cache.Resource!, cacheLimit, maxConnections, idFactory);
localized.Information("Session provider loaded");
//Listen for cache table events
_ = plugin.DeferTask(() => _sessions.CleanupExpiredSessionsAsync(localized, plugin.UnloadToken));
//Run and wait for exit
await cache.RunAsync(localized, plugin.UnloadToken);
}
catch (OperationCanceledException)
{ }
catch (KeyNotFoundException e)
{
localized.Error("Missing required configuration variable for VnCache client: {0}", e.Message);
}
catch (FBMServerNegiationException fne)
{
localized.Error("Failed to negotiate connection with cache server {reason}", fne.Message);
}
catch (Exception ex)
{
localized.Error(ex, "Cache client error occured in session provider");
}
finally
{
_sessions = null;
}
localized.Information("Cache client exited");
}
}
}
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