57 lines
2.2 KiB
C#
57 lines
2.2 KiB
C#
|
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
|
||
|
|
using NodaTime;
|
||
|
|
|
||
|
|
namespace Foxnouns.Backend.Database;
|
||
|
|
|
||
|
|
public readonly struct Snowflake(ulong value)
|
||
|
|
{
|
||
|
|
public const long Epoch = 1_640_995_200_000; // 2022-01-01 at 00:00:00 UTC
|
||
|
|
public readonly ulong Value = value;
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The time this snowflake was created.
|
||
|
|
/// </summary>
|
||
|
|
public Instant Time => Instant.FromUnixTimeMilliseconds(Timestamp);
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The Unix timestamp embedded in this snowflake, in milliseconds.
|
||
|
|
/// </summary>
|
||
|
|
public long Timestamp => (long)((Value >> 22) + Epoch);
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The process ID embedded in this snowflake.
|
||
|
|
/// </summary>
|
||
|
|
public byte ProcessId => (byte)((Value & 0x3E0000) >> 17);
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The thread ID embedded in this snowflake.
|
||
|
|
/// </summary>
|
||
|
|
public byte ThreadId => (byte)((Value & 0x1F000) >> 12);
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The increment embedded in this snowflake.
|
||
|
|
/// </summary>
|
||
|
|
public short Increment => (short)(Value & 0xFFF);
|
||
|
|
|
||
|
|
public static bool operator <(Snowflake arg1, Snowflake arg2) => arg1.Value < arg2.Value;
|
||
|
|
public static bool operator >(Snowflake arg1, Snowflake arg2) => arg1.Value > arg2.Value;
|
||
|
|
public static bool operator ==(Snowflake arg1, Snowflake arg2) => arg1.Value == arg2.Value;
|
||
|
|
public static bool operator !=(Snowflake arg1, Snowflake arg2) => arg1.Value != arg2.Value;
|
||
|
|
|
||
|
|
public static implicit operator ulong(Snowflake s) => s.Value;
|
||
|
|
public static implicit operator long(Snowflake s) => (long)s.Value;
|
||
|
|
public static implicit operator Snowflake(ulong n) => new(n);
|
||
|
|
public static implicit operator Snowflake(long n) => new((ulong)n);
|
||
|
|
|
||
|
|
public override bool Equals(object? obj) => obj is Snowflake other && Value == other.Value;
|
||
|
|
public override int GetHashCode() => Value.GetHashCode();
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// An Entity Framework ValueConverter for Snowflakes to longs.
|
||
|
|
/// </summary>
|
||
|
|
// ReSharper disable once ClassNeverInstantiated.Global
|
||
|
|
public class ValueConverter() : ValueConverter<Snowflake, long>(
|
||
|
|
convertToProviderExpression: x => x,
|
||
|
|
convertFromProviderExpression: x => x
|
||
|
|
);
|
||
|
|
}
|