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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Loading
* File: RoutingExtensions.cs
*
* RoutingExtensions.cs is part of VNLib.Plugins.Extensions.Loading which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Loading 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.Extensions.Loading 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.Reflection;
using System.Threading.Tasks;
using System.Collections.Frozen;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Runtime.CompilerServices;
using VNLib.Net.Http;
using VNLib.Utils.Logging;
using VNLib.Utils.Resources;
using VNLib.Plugins.Essentials.Runtime;
using VNLib.Plugins.Essentials;
using VNLib.Plugins.Essentials.Endpoints;
using VNLib.Plugins.Extensions.Loading.Routing.Mvc;
namespace VNLib.Plugins.Extensions.Loading.Routing
{
/// <summary>
/// Provides advanced QOL features to plugin loading
/// </summary>
public static partial class RoutingExtensions
{
private static readonly ConditionalWeakTable<IEndpoint, PluginBase?> _pluginRefs = new();
private static readonly ConditionalWeakTable<PluginBase, EndpointCollection> _pluginEndpoints = new();
/// <summary>
/// Constructs and routes the specific endpoint type for the current plugin
/// </summary>
/// <typeparam name="T">The <see cref="IEndpoint"/> type</typeparam>
/// <param name="plugin"></param>
/// <exception cref="TargetInvocationException"></exception>
public static T Route<T>(this PluginBase plugin) where T : IEndpoint
{
//Create the endpoint service, then route it
T endpoint = plugin.CreateService<T>();
//Route the endpoint
Route(plugin, endpoint);
//Store ref to plugin for endpoint
_pluginRefs.Add(endpoint, plugin);
//Function that initalizes the endpoint's path and logging variables
InitEndpointSettings(plugin, endpoint);
return endpoint;
}
/// <summary>
/// Routes a single endpoint for the current plugin and exports the collection to the
/// service pool
/// </summary>
/// <param name="plugin"></param>
/// <param name="endpoint">The endpoint to add to the collection</param>
public static void Route(this PluginBase plugin, IEndpoint endpoint)
{
/*
* Export the new collection to the service pool in the constructor
* function to ensure it's only export once per plugin
*/
static EndpointCollection OnCreate(PluginBase plugin)
{
EndpointCollection collection = new();
plugin.ExportService<IVirtualEndpointDefinition>(collection);
return collection;
}
//Get the endpoint collection for the current plugin
EndpointCollection endpoints = _pluginEndpoints.GetValue(plugin, OnCreate);
//Add the endpoint to the collection
endpoints.Endpoints.Add(endpoint);
}
/// <summary>
/// Gets the plugin that loaded the current endpoint
/// </summary>
/// <param name="ep"></param>
/// <returns>The plugin that loaded the current endpoint</returns>
/// <exception cref="InvalidOperationException"></exception>
public static PluginBase GetPlugin(this IEndpoint ep)
{
_ = _pluginRefs.TryGetValue(ep, out PluginBase? pBase);
return pBase ?? throw new InvalidOperationException("Endpoint was not dynamically routed");
}
private static readonly Regex ConfigSyntaxParser = ParserRegex();
private delegate void InitFunc(string path, ILogProvider log);
[GeneratedRegex("{{(.*?)}}", RegexOptions.Compiled)]
private static partial Regex ParserRegex();
private static void InitEndpointSettings<T>(PluginBase plugin, T endpoint) where T : IEndpoint
{
//Load optional config
IConfigScope config = plugin.GetConfigForType<T>();
ILogProvider logger = plugin.Log;
EndpointPathAttribute? pathAttr = typeof(T).GetCustomAttribute<EndpointPathAttribute>();
/*
* gets the protected function for assigning the endpoint path
* and logger instance.
*/
InitFunc? initPathAndLog = ManagedLibrary.TryGetMethod<InitFunc>(endpoint, "InitPathAndLog", BindingFlags.NonPublic);
if (pathAttr is null || initPathAndLog is null)
{
return;
}
string? logName = typeof(T).GetCustomAttribute<EndpointLogNameAttribute>()?.LogName;
if (!string.IsNullOrWhiteSpace(logName))
{
logger = plugin.Log.CreateScope(SubsituteValue(logName, config));
}
try
{
//Invoke init function and pass in variable names
initPathAndLog(
path: SubsituteValue(pathAttr.Path, config),
logger
);
}
catch (ConfigurationException)
{
throw;
}
catch(Exception e)
{
throw new ConfigurationException($"Failed to initalize endpoint {endpoint.GetType().Name}", e);
}
static string SubsituteValue(string pathVar, IConfigScope? config)
{
if (config is null)
{
return pathVar;
}
// Replace the matched pattern with the corresponding value from the dictionary
return ConfigSyntaxParser.Replace(pathVar, match =>
{
string varName = match.Groups[1].Value;
//Get the value from the config scope or return the original variable unmodified
return config.GetValueOrDefault(varName, varName);
});
}
}
private sealed class EndpointCollection : IVirtualEndpointDefinition
{
public List<IEndpoint> Endpoints { get; } = new();
///<inheritdoc/>
IEnumerable<IEndpoint> IVirtualEndpointDefinition.GetEndpoints() => Endpoints;
}
private delegate ValueTask<VfReturnType> EndpointWorkFunc(HttpEntity entity);
sealed record class HttpControllerEndpoint(MethodInfo MethodInfo, HttpEndpointAttribute Attr)
{
public string Path => Attr.Path;
public HttpMethod Method => Attr.Method;
public EndpointWorkFunc Func { get; } = MethodInfo.CreateDelegate<EndpointWorkFunc>();
}
private sealed class EndpointWrapper
: ResourceEndpointBase
{
private readonly FrozenDictionary<HttpMethod, EndpointWorkFunc> _wrappers;
public EndpointWrapper(FrozenDictionary<HttpMethod, EndpointWorkFunc> table, string path, ILogProvider log)
{
_wrappers = table;
InitPathAndLog(path, log);
}
protected override ValueTask<VfReturnType> OnProcessAsync(HttpEntity entity)
{
ref readonly EndpointWorkFunc func = ref _wrappers.GetValueRefOrNullRef(entity.Server.Method);
if (Unsafe.IsNullRef(in func))
{
return ValueTask.FromResult(VfReturnType.ProcessAsFile);
}
return func(entity);
}
}
}
}
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