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Migrate to type-safe model ID structs

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This commit is contained in:
Ske
2020-06-14 21:37:04 +02:00
parent e5ac5edc35
commit b9cbd241de
21 changed files with 167 additions and 41 deletions
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45
PluralKit.Core/Database/Database.cs
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@@ -1,6 +1,8 @@
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using App.Metrics;
@@ -36,13 +38,14 @@ namespace PluralKit.Core
public static void InitStatic()
{
DefaultTypeMap.MatchNamesWithUnderscores = true;
// Dapper by default tries to pass ulongs to Npgsql, which rejects them since PostgreSQL technically
// doesn't support unsigned types on its own.
// Instead we add a custom mapper to encode them as signed integers instead, converting them back and forth.
SqlMapper.RemoveTypeMap(typeof(ulong));
SqlMapper.AddTypeHandler(new UlongEncodeAsLongHandler());
SqlMapper.AddTypeHandler(new UlongArrayHandler());
DefaultTypeMap.MatchNamesWithUnderscores = true;
NpgsqlConnection.GlobalTypeMapper.UseNodaTime();
// With the thing we add above, Npgsql already handles NodaTime integration
@@ -51,6 +54,14 @@ namespace PluralKit.Core
SqlMapper.AddTypeHandler(new PassthroughTypeHandler<Instant>());
SqlMapper.AddTypeHandler(new PassthroughTypeHandler<LocalDate>());
// Add ID types to Dapper
SqlMapper.AddTypeHandler(new NumericIdHandler<SystemId, int>(i => new SystemId(i)));
SqlMapper.AddTypeHandler(new NumericIdHandler<MemberId, int>(i => new MemberId(i)));
SqlMapper.AddTypeHandler(new NumericIdHandler<SwitchId, int>(i => new SwitchId(i)));
SqlMapper.AddTypeHandler(new NumericIdArrayHandler<SystemId, int>(i => new SystemId(i)));
SqlMapper.AddTypeHandler(new NumericIdArrayHandler<MemberId, int>(i => new MemberId(i)));
SqlMapper.AddTypeHandler(new NumericIdArrayHandler<SwitchId, int>(i => new SwitchId(i)));
// Register our custom types to Npgsql
// Without these it'll still *work* but break at the first launch + probably cause other small issues
NpgsqlConnection.GlobalTypeMapper.MapComposite<ProxyTag>("proxy_tag");
@@ -153,5 +164,37 @@ namespace PluralKit.Core
public override ulong[] Parse(object value) => Array.ConvertAll((long[]) value, i => (ulong) i);
}
private class NumericIdHandler<T, TInner>: SqlMapper.TypeHandler<T>
where T: INumericId<T, TInner>
where TInner: IEquatable<TInner>, IComparable<TInner>
{
private readonly Func<TInner, T> _factory;
public NumericIdHandler(Func<TInner, T> factory)
{
_factory = factory;
}
public override void SetValue(IDbDataParameter parameter, T value) => parameter.Value = value.Value;
public override T Parse(object value) => _factory((TInner) value);
}
private class NumericIdArrayHandler<T, TInner>: SqlMapper.TypeHandler<T[]>
where T: INumericId<T, TInner>
where TInner: IEquatable<TInner>, IComparable<TInner>
{
private readonly Func<TInner, T> _factory;
public NumericIdArrayHandler(Func<TInner, T> factory)
{
_factory = factory;
}
public override void SetValue(IDbDataParameter parameter, T[] value) => parameter.Value = Array.ConvertAll(value, v => v.Value);
public override T[] Parse(object value) => Array.ConvertAll((TInner[]) value, v => _factory(v));
}
}
}