dev-npgsql/npgsql: Npgsql is the .NET data provider for PostgreSQL.

src/Npgsql.NodaTime/Internal/TimestampTzHandler.cs
126 строк6 KB
Shay Rojansky
Fix reading of NodaTime DateInterval with infinite upper bound (#4718)
14 окт 2022, 16:54
14 окт 2022, 16:54dcd34dc
using System;
using NodaTime;
using Npgsql.BackendMessages;
using Npgsql.Internal;
using Npgsql.Internal.TypeHandling;
using Npgsql.NodaTime.Properties;
using Npgsql.PostgresTypes;
using BclTimestampTzHandler = Npgsql.Internal.TypeHandlers.DateTimeHandlers.TimestampTzHandler;
using static Npgsql.NodaTime.Internal.NodaTimeUtils;

namespace Npgsql.NodaTime.Internal;

sealed partial class TimestampTzHandler : NpgsqlSimpleTypeHandler<Instant>, INpgsqlSimpleTypeHandler<ZonedDateTime>,
    INpgsqlSimpleTypeHandler<OffsetDateTime>, INpgsqlSimpleTypeHandler<DateTimeOffset>,
    INpgsqlSimpleTypeHandler<DateTime>, INpgsqlSimpleTypeHandler<long>
{
    readonly BclTimestampTzHandler _bclHandler;

    public TimestampTzHandler(PostgresType postgresType)
        : base(postgresType)
        => _bclHandler = new BclTimestampTzHandler(postgresType);

    #region Read

    public override Instant Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription = null)
        => ReadInstant(buf);

    internal static Instant ReadInstant(NpgsqlReadBuffer buf)
        => buf.ReadInt64() switch
        {
            long.MaxValue => DisableDateTimeInfinityConversions
                ? throw new InvalidCastException(NpgsqlNodaTimeStrings.CannotReadInfinityValue)
                : Instant.MaxValue,
            long.MinValue => DisableDateTimeInfinityConversions
                ? throw new InvalidCastException(NpgsqlNodaTimeStrings.CannotReadInfinityValue)
                : Instant.MinValue,
            var value => DecodeInstant(value)
        };

    ZonedDateTime INpgsqlSimpleTypeHandler<ZonedDateTime>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)
        => Read(buf, len, fieldDescription).InUtc();

    OffsetDateTime INpgsqlSimpleTypeHandler<OffsetDateTime>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)
        => Read(buf, len, fieldDescription).WithOffset(Offset.Zero);

    DateTimeOffset INpgsqlSimpleTypeHandler<DateTimeOffset>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)
        => _bclHandler.Read<DateTimeOffset>(buf, len, fieldDescription);

    DateTime INpgsqlSimpleTypeHandler<DateTime>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)
        => _bclHandler.Read<DateTime>(buf, len, fieldDescription);

    long INpgsqlSimpleTypeHandler<long>.Read(NpgsqlReadBuffer buf, int len, FieldDescription? fieldDescription)
        => ((INpgsqlSimpleTypeHandler<long>)_bclHandler).Read(buf, len, fieldDescription);

    #endregion Read

    #region Write

    public override int ValidateAndGetLength(Instant value, NpgsqlParameter? parameter)
        => 8;

    int INpgsqlSimpleTypeHandler<ZonedDateTime>.ValidateAndGetLength(ZonedDateTime value, NpgsqlParameter? parameter)
        => value.Zone == DateTimeZone.Utc || LegacyTimestampBehavior
            ? 8
            : throw new InvalidCastException(
                $"Cannot write ZonedDateTime with Zone={value.Zone} to PostgreSQL type 'timestamp with time zone', " +
                "only UTC is supported. " +
                "See the Npgsql.EnableLegacyTimestampBehavior AppContext switch to enable legacy behavior.");

    public int ValidateAndGetLength(OffsetDateTime value, NpgsqlParameter? parameter)
        => value.Offset == Offset.Zero || LegacyTimestampBehavior
            ? 8
            : throw new InvalidCastException(
                $"Cannot write OffsetDateTime with Offset={value.Offset} to PostgreSQL type 'timestamp with time zone', " +
                "only offset 0 (UTC) is supported. " +
                "See the Npgsql.EnableLegacyTimestampBehavior AppContext switch to enable legacy behavior.");

    public override void Write(Instant value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
        => WriteInstant(value, buf);

    internal static void WriteInstant(Instant value, NpgsqlWriteBuffer buf)
    {
        if (!DisableDateTimeInfinityConversions)
        {
            if (value == Instant.MaxValue)
            {
                buf.WriteInt64(long.MaxValue);
                return;
            }

            if (value == Instant.MinValue)
            {
                buf.WriteInt64(long.MinValue);
                return;
            }
        }

        buf.WriteInt64(EncodeInstant(value));
    }

    void INpgsqlSimpleTypeHandler<ZonedDateTime>.Write(ZonedDateTime value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
        => Write(value.ToInstant(), buf, parameter);

    public void Write(OffsetDateTime value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
        => Write(value.ToInstant(), buf, parameter);

    int INpgsqlSimpleTypeHandler<DateTimeOffset>.ValidateAndGetLength(DateTimeOffset value, NpgsqlParameter? parameter)
        => _bclHandler.ValidateAndGetLength(value, parameter);

    void INpgsqlSimpleTypeHandler<DateTimeOffset>.Write(DateTimeOffset value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
        => _bclHandler.Write(value, buf, parameter);

    int INpgsqlSimpleTypeHandler<DateTime>.ValidateAndGetLength(DateTime value, NpgsqlParameter? parameter)
        => ((INpgsqlSimpleTypeHandler<DateTime>)_bclHandler).ValidateAndGetLength(value, parameter);

    public int ValidateAndGetLength(long value, NpgsqlParameter? parameter)
        => ((INpgsqlSimpleTypeHandler<long>)_bclHandler).ValidateAndGetLength(value, parameter);

    void INpgsqlSimpleTypeHandler<DateTime>.Write(DateTime value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
        => _bclHandler.Write(value, buf, parameter);

    void INpgsqlSimpleTypeHandler<long>.Write(long value, NpgsqlWriteBuffer buf, NpgsqlParameter? parameter)
        => ((INpgsqlSimpleTypeHandler<long>)_bclHandler).Write(value, buf, parameter);

    #endregion Write
}