Foxchat.NET/Foxchat.Chat/Database/ChatContext.cs

using Foxchat.Core;
using Foxchat.Core.Database;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Npgsql;

namespace Foxchat.Chat.Database;

public class ChatContext : IDatabaseContext
{
    private readonly NpgsqlDataSource _dataSource;

    public override DbSet<Instance> Instance { get; set; }

    public ChatContext(InstanceConfig config)
    {
        var connString = new NpgsqlConnectionStringBuilder(config.Database.Url)
        {
            Timeout = config.Database.Timeout ?? 5,
            MaxPoolSize = config.Database.MaxPoolSize ?? 50,
        }.ConnectionString;

        var dataSourceBuilder = new NpgsqlDataSourceBuilder(connString);
        dataSourceBuilder.UseNodaTime();
        _dataSource = dataSourceBuilder.Build();
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
            => optionsBuilder
                .UseNpgsql(_dataSource, o => o.UseNodaTime())
                .UseSnakeCaseNamingConvention();

    protected override void ConfigureConventions(ModelConfigurationBuilder configurationBuilder)
    {
        // ULIDs are stored as UUIDs in the database
        configurationBuilder.Properties<Ulid>().HaveConversion<UlidConverter>();
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
    }
}

public class DesignTimeIdentityContextFactory : IDesignTimeDbContextFactory<ChatContext>
{
    public ChatContext CreateDbContext(string[] args)
    {
        // Read the configuration file
        var config = new ConfigurationBuilder()
            .AddConfiguration("identity.ini")
            .Build()
            // Get the configuration as our config class
            .Get<InstanceConfig>() ?? new();

        return new ChatContext(config);
    }
}