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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.ServiceStack
* File: HttpServiceStackBuilder.cs
*
* HttpServiceStackBuilder.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;
using System.Collections.Generic;
using VNLib.Net.Http;
namespace VNLib.Plugins.Essentials.ServiceStack
{
/// <summary>
/// A data structure used to build/create a <see cref="HttpServiceStack"/>
/// around a <see cref="ServiceDomain"/>
/// </summary>
public sealed class HttpServiceStackBuilder
{
/// <summary>
/// Initializes a new <see cref="HttpServiceStack"/> that will
/// generate servers to listen for services exposed by the
/// specified host context
/// </summary>
public HttpServiceStackBuilder()
{}
private Action<ICollection<IServiceHost>>? _hostBuilder;
private Func<ServiceGroup, IHttpServer>? _getServers;
/// <summary>
/// Uses the supplied callback to get a collection of virtual hosts
/// to build the current domain with
/// </summary>
/// <param name="hostBuilder">The callback method to build virtual hosts</param>
/// <returns>A value that indicates if any virtual hosts were successfully loaded</returns>
public HttpServiceStackBuilder WithDomainBuilder(Action<ICollection<IServiceHost>> hostBuilder)
{
_hostBuilder = hostBuilder;
return this;
}
/// <summary>
/// Spcifies a callback function that builds <see cref="IHttpServer"/> instances from the hosts
/// </summary>
/// <param name="getServers">A callback method that gets the http server implementation for the service group</param>
public HttpServiceStackBuilder WithHttp(Func<ServiceGroup, IHttpServer> getServers)
{
_getServers = getServers;
return this;
}
/// <summary>
/// Builds the new <see cref="HttpServiceStack"/> from the configured callbacks, WITHOUT loading plugins
/// </summary>
/// <returns>The newly constructed <see cref="HttpServiceStack"/> that may be used to manage your http services</returns>
/// <exception cref="ArgumentNullException"></exception>
public HttpServiceStack Build()
{
_ = _hostBuilder ?? throw new ArgumentNullException("WithDomainBuilder", "You have not configured a service domain configuration callback");
_ = _getServers ?? throw new ArgumentNullException("WithHttp", "You have not configured a IHttpServer configuration callback");
//Inint the service domain
ServiceDomain sd = new();
try
{
if (!sd.BuildDomain(_hostBuilder))
{
throw new ArgumentException("Failed to configure the service domain, you must expose at least one service host");
}
LinkedList<IHttpServer> servers = new();
//enumerate hosts groups
foreach (ServiceGroup hosts in sd.ServiceGroups)
{
//Create new server
IHttpServer server = _getServers.Invoke(hosts);
//Add server to internal list
servers.AddLast(server);
}
//Return the service stack
return new HttpServiceStack(servers, sd);
}
catch
{
sd.Dispose();
throw;
}
}
}
}
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