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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.ServiceStack
* File: ServiceGroup.cs
*
* ServiceGroup.cs is part of VNLib.Plugins.Essentials.ServiceStack which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.ServiceStack 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 2 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Essentials.ServiceStack 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.Net;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using VNLib.Utils.Extensions;
using VNLib.Plugins.Runtime;
using VNLib.Plugins.Essentials.Content;
using VNLib.Plugins.Essentials.Sessions;
namespace VNLib.Plugins.Essentials.ServiceStack
{
/// <summary>
/// Represents a collection of virtual hosts that share a
/// common transport (interface, port, and SSL status)
/// and may be loaded by a single server instance.
/// </summary>
public sealed class ServiceGroup
{
private readonly LinkedList<IServiceHost> _vHosts;
private readonly ConditionalWeakTable<RuntimePluginLoader, IEndpoint[]> _endpointsForPlugins;
/// <summary>
/// The <see cref="IPEndPoint"/> transport endpoint for all loaded service hosts
/// </summary>
public IPEndPoint ServiceEndpoint { get; }
/// <summary>
/// The collection of hosts that are loaded by this group
/// </summary>
public IReadOnlyCollection<IServiceHost> Hosts => _vHosts;
/// <summary>
/// Initalizes a new <see cref="ServiceGroup"/> of virtual hosts
/// with common transport
/// </summary>
/// <param name="serviceEndpoint">The <see cref="IPEndPoint"/> to listen for connections on</param>
/// <param name="hosts">The hosts that share a common interface endpoint</param>
public ServiceGroup(IPEndPoint serviceEndpoint, IEnumerable<IServiceHost> hosts)
{
_endpointsForPlugins = new();
_vHosts = new(hosts);
ServiceEndpoint = serviceEndpoint;
}
/// <summary>
/// Sets the specified page rotuer for all virtual hosts
/// </summary>
/// <param name="router">The page router to user</param>
internal void UpdatePageRouter(IPageRouter router) => _vHosts.TryForeach(v => v.Processor.SetPageRouter(router));
/// <summary>
/// Sets the specified session provider for all virtual hosts
/// </summary>
/// <param name="current">The session provider to use</param>
internal void UpdateSessionProvider(ISessionProvider current) => _vHosts.TryForeach(v => v.Processor.SetSessionProvider(current));
/// <summary>
/// Adds or updates all endpoints exported by all plugins
/// within the specified loader. All endpoints exposed
/// by a previously loaded instance are removed and all
/// currently exposed endpoints are added to all virtual
/// hosts
/// </summary>
/// <param name="loader">The plugin loader to get add/update endpoints from</param>
internal void AddOrUpdateEndpointsForPlugin(RuntimePluginLoader loader)
{
//Get all new endpoints for plugin
IEndpoint[] newEndpoints = loader.LivePlugins.SelectMany(static pl => pl.Plugin!.GetEndpoints()).ToArray();
//See if
if(_endpointsForPlugins.TryGetValue(loader, out IEndpoint[]? oldEps))
{
//Remove old endpoints
_vHosts.TryForeach(v => v.Processor.RemoveEndpoint(oldEps));
}
//Add endpoints to dict
_endpointsForPlugins.AddOrUpdate(loader, newEndpoints);
//Add endpoints to hosts
_vHosts.TryForeach(v => v.Processor.AddEndpoint(newEndpoints));
}
/// <summary>
/// Unloads all previously stored endpoints, router, session provider, and
/// clears all internal data structures
/// </summary>
internal void UnloadAll()
{
//Remove all loaded endpoints
_vHosts.TryForeach(v => _endpointsForPlugins.TryForeach(eps => v.Processor.RemoveEndpoint(eps.Value)));
//Remove all routers
_vHosts.TryForeach(static v => v.Processor.SetPageRouter(null));
//Remove all session providers
_vHosts.TryForeach(static v => v.Processor.SetSessionProvider(null));
//Clear all hosts
_vHosts.Clear();
//Clear all endpoints
_endpointsForPlugins.Clear();
}
}
}
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