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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Loading.Sql
* File: SqlDbConnectionLoader.cs
*
* SqlDbConnectionLoader.cs is part of VNLib.Plugins.Extensions.Loading.Sql which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Loading.Sql 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.Sql 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.Text.Json;
using System.Data.Common;
using System.Collections.Generic;
using MySqlConnector;
using Microsoft.Data.Sqlite;
using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;
using VNLib.Utils.Logging;
using VNLib.Utils.Extensions;
namespace VNLib.Plugins.Extensions.Loading.Sql
{
/// <summary>
/// Provides common basic SQL loading extensions for plugins
/// </summary>
public static class SqlDbConnectionLoader
{
public const string SQL_CONFIG_KEY = "sql";
public const string DB_PASSWORD_KEY = "db_password";
/// <summary>
/// Gets (or loads) the ambient sql connection factory for the current plugin
/// </summary>
/// <param name="plugin"></param>
/// <returns>The ambient <see cref="DbConnection"/> factory</returns>
/// <exception cref="KeyNotFoundException"></exception>
/// <exception cref="ObjectDisposedException"></exception>
public static Func<DbConnection> GetConnectionFactory(this PluginBase plugin)
{
plugin.ThrowIfUnloaded();
//Get or load
return LoadingExtensions.GetOrCreateSingleton(plugin, FactoryLoader);
}
private static Func<DbConnection> FactoryLoader(PluginBase plugin)
{
IReadOnlyDictionary<string, JsonElement> sqlConf = plugin.GetConfig(SQL_CONFIG_KEY);
//Get the db-type
string? type = sqlConf.GetPropString("db_type");
if ("sqlite".Equals(type, StringComparison.OrdinalIgnoreCase))
{
//Use connection builder
DbConnectionStringBuilder sqlBuilder = new SqliteConnectionStringBuilder()
{
DataSource = sqlConf["source"].GetString(),
};
string connectionString = sqlBuilder.ToString();
DbConnection DbFactory() => new SqliteConnection(connectionString);
return DbFactory;
}
else if("mysql".Equals(type, StringComparison.OrdinalIgnoreCase))
{
using SecretResult? password = plugin.TryGetSecretAsync(DB_PASSWORD_KEY).Result;
DbConnectionStringBuilder sqlBuilder = new MySqlConnectionStringBuilder()
{
Server = sqlConf["hostname"].GetString(),
Database = sqlConf["database"].GetString(),
UserID = sqlConf["username"].GetString(),
Password = password?.Result.ToString(),
Pooling = true,
LoadBalance = MySqlLoadBalance.LeastConnections,
MinimumPoolSize = sqlConf["min_pool_size"].GetUInt32()
};
string connectionString = sqlBuilder.ToString();
DbConnection DbFactory() => new MySqlConnection(connectionString);
return DbFactory;
}
//Default to mssql
else
{
using SecretResult? password = plugin.TryGetSecretAsync(DB_PASSWORD_KEY).Result;
//Use connection builder
DbConnectionStringBuilder sqlBuilder = new SqlConnectionStringBuilder()
{
DataSource = sqlConf["hostname"].GetString(),
UserID = sqlConf["username"].GetString(),
Password = password?.Result.ToString(),
InitialCatalog = sqlConf["catalog"].GetString(),
IntegratedSecurity = sqlConf["ms_security"].GetBoolean(),
Pooling = true,
MinPoolSize = sqlConf["min_pool_size"].GetInt32(),
Replication = true
};
string connectionString = sqlBuilder.ToString();
DbConnection DbFactory() => new SqlConnection(connectionString);
return DbFactory;
}
}
/// <summary>
/// Gets (or loads) the ambient <see cref="DbContextOptions"/> configured from
/// the ambient sql factory
/// </summary>
/// <param name="plugin"></param>
/// <returns>The ambient <see cref="DbContextOptions"/> for the current plugin</returns>
/// <exception cref="KeyNotFoundException"></exception>
/// <exception cref="ObjectDisposedException"></exception>
/// <remarks>If plugin is in debug mode, writes log data to the default log</remarks>
public static DbContextOptions GetContextOptions(this PluginBase plugin)
{
plugin.ThrowIfUnloaded();
return LoadingExtensions.GetOrCreateSingleton(plugin, GetDbOptionsLoader);
}
private static DbContextOptions GetDbOptionsLoader(PluginBase plugin)
{
//Get a db connection object
using DbConnection connection = plugin.GetConnectionFactory().Invoke();
DbContextOptionsBuilder builder = new();
//Determine connection type
if(connection is SqlConnection sql)
{
//Use sql server from connection
builder.UseSqlServer(sql.ConnectionString);
}
else if(connection is SqliteConnection slc)
{
builder.UseSqlite(slc.ConnectionString);
}
else if(connection is MySqlConnection msconn)
{
//Detect version
ServerVersion version = ServerVersion.AutoDetect(msconn);
builder.UseMySql(msconn.ConnectionString, version);
}
//Enable logging
if(plugin.IsDebug())
{
builder.LogTo(plugin.Log.Debug);
}
//Get context and freez it before returning
DbContextOptions options = builder.Options;
options.Freeze();
return options;
}
}
}
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