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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: CMNext
* Package: Content.Publishing.Blog.Admin
* File: ChannelManager.cs
*
* CMNext 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.
*
* CMNext 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.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Generic;
using VNLib.Utils.IO;
using VNLib.Hashing;
using VNLib.Plugins;
using VNLib.Plugins.Extensions.Loading;
using Content.Publishing.Blog.Admin.Storage;
namespace Content.Publishing.Blog.Admin.Model
{
[ConfigurationName("blog_channels")]
internal sealed class ChannelManager : IChannelContextManager
{
private readonly ISimpleFilesystem Storage;
private readonly string _indexPath;
public ChannelManager(PluginBase plugin, IConfigScope config)
{
//Init minio client
Storage = plugin.GetOrCreateSingleton<ManagedStorage>();
_indexPath = config["index_file_name"].GetString() ?? "channels.json";
}
///<inheritdoc/>
public async Task<bool> CreateChannelAsync(BlogChannel context, CancellationToken cancellation)
{
_ = context.Id ?? throw new ArgumentNullException(nameof(context.Id));
IRecordDb<BlogChannel> db = await LoadDb(cancellation);
BlogChannel? existing = db.GetRecord(context.Id);
//Make sure the id is unique
if (existing != null)
{
return false;
}
//Add to the index
db.SetRecord(context);
//Publish updated index to storage
await StoreDb(db, cancellation);
return true;
}
///<inheritdoc/>
public async Task<bool> UpdateChannelAsync(BlogChannel channel, CancellationToken cancellation)
{
_ = channel.Id ?? throw new ArgumentNullException(nameof(channel.Id));
IRecordDb<BlogChannel> db = await LoadDb(cancellation);
//Get the original context for the channel
_ = db.GetRecord(channel.Id) ?? throw new KeyNotFoundException("The requested channel does not exist");
//Add the updated context to the index
db.SetRecord(channel);
//Publish updated index to storage
await StoreDb(db, cancellation);
return true;
}
///<inheritdoc/>
public async Task DeleteChannelAsync(IChannelContext context, CancellationToken cancellation)
{
_ = context?.Id ?? throw new ArgumentNullException(nameof(context));
IRecordDb<BlogChannel> db = await LoadDb(cancellation);
//Remove from the index
db.RemoveRecord(context.Id);
//Delete the channel dir
await Storage.DeleteFileAsync(context.BaseDir, cancellation);
//Publish updated index to storage
await StoreDb(db, cancellation);
}
/// <summary>
/// Computes the unique id for a context
/// </summary>
/// <param name="context">The context to produce the context id for</param>
/// <returns>The unique context id</returns>
public static string ComputeContextId(IChannelContext context)
{
//Context-id is the hash of the base dir and index file path
return ManagedHash.ComputeHexHash($"{context.BaseDir}/{context.IndexPath}", HashAlg.SHA1).ToLowerInvariant();
}
///<inheritdoc/>
public async Task<IChannelContext?> GetChannelAsync(string id, CancellationToken cancellation)
{
//Recover the db
IRecordDb<BlogChannel> db = await LoadDb(cancellation);
//Get the channel
return db.GetRecord(id);
}
///<inheritdoc/>
public async Task<object[]> GetAllContextsAsync(CancellationToken cancellation)
{
//Recover the db
IRecordDb<BlogChannel> db = await LoadDb(cancellation);
//Get the channel
return db.GetRecords().ToArray();
}
private Task<IRecordDb<BlogChannel>> LoadDb(CancellationToken cancellation)
{
return Storage.LoadDbAsync<BlogChannel>(_indexPath, cancellation);
}
private Task StoreDb(IRecordDb<BlogChannel> db, CancellationToken cancellation)
{
return Storage.StoreAsync(_indexPath, db, cancellation);
}
}
}
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