86 lines
2.8 KiB
C#
86 lines
2.8 KiB
C#
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// -----------------------------------------------------------------------------
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// 让 .NET 开发更简单，更通用，更流行。
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// Copyright © 2020-2021 Furion, 百小僧, Baiqian Co.,Ltd.
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//
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// 框架名称：Furion
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// 框架作者：百小僧
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// 框架版本：2.7.9
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// 源码地址：Gitee： https://gitee.com/dotnetchina/Furion
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// Github：https://github.com/monksoul/Furion
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// 开源协议：Apache-2.0（https://gitee.com/dotnetchina/Furion/blob/master/LICENSE）
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// -----------------------------------------------------------------------------
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using System;
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using System.Security.Cryptography;
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namespace HT.Cloud.Code
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{
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/// <summary>
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/// 连续 GUID ID 生成器
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/// <para>代码参考自：https://github.com/PomeloFoundation/Pomelo.EntityFrameworkCore.MySql/blob/ebe011a6f1b2a2a9709fe558cfc7ed3215b55c37/src/EFCore.MySql/ValueGeneration/Internal/MySqlSequentialGuidValueGenerator.cs </para>
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/// </summary>
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public class SequentialGuidIDGenerator : IDistributedIDGenerator
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{
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/// <summary>
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/// 随机数生成器
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/// </summary>
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private static readonly RandomNumberGenerator _rng = RandomNumberGenerator.Create();
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/// <summary>
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/// 生成逻辑
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/// </summary>
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/// <param name="idGeneratorOptions"></param>
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/// <returns></returns>
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public object Create(object idGeneratorOptions = null)
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{
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// According to RFC 4122:
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// dddddddd-dddd-Mddd-Ndrr-rrrrrrrrrrrr
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// - M = RFC version, in this case '4' for random UUID
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// - N = RFC variant (plus other bits), in this case 0b1000 for variant 1
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// - d = nibbles based on UTC date/time in ticks
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// - r = nibbles based on random bytes
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var options = (idGeneratorOptions ?? new SequentialGuidSettings()) as SequentialGuidSettings;
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var randomBytes = new byte[7];
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_rng.GetBytes(randomBytes);
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var ticks = (ulong)options.TimeNow.Ticks;
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var uuidVersion = (ushort)4;
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var uuidVariant = (ushort)0b1000;
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var ticksAndVersion = (ushort)((ticks << 48 >> 52) | (ushort)(uuidVersion << 12));
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var ticksAndVariant = (byte)((ticks << 60 >> 60) | (byte)(uuidVariant << 4));
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if (options.LittleEndianBinary16Format)
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{
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var guidBytes = new byte[16];
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var tickBytes = BitConverter.GetBytes(ticks);
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if (BitConverter.IsLittleEndian)
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{
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Array.Reverse(tickBytes);
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}
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Buffer.BlockCopy(tickBytes, 0, guidBytes, 0, 6);
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guidBytes[6] = (byte)(ticksAndVersion << 8 >> 8);
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guidBytes[7] = (byte)(ticksAndVersion >> 8);
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guidBytes[8] = ticksAndVariant;
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Buffer.BlockCopy(randomBytes, 0, guidBytes, 9, 7);
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return new Guid(guidBytes);
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}
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var guid = new Guid((uint)(ticks >> 32), (ushort)(ticks << 32 >> 48), ticksAndVersion,
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ticksAndVariant,
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randomBytes[0],
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randomBytes[1],
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randomBytes[2],
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randomBytes[3],
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randomBytes[4],
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randomBytes[5],
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randomBytes[6]);
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return guid;
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}
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}
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}
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