67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
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package helpers
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import (
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"crypto/rand"
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"encoding/binary"
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"fmt"
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"time"
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)
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const (
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// UUID v7 格式常量.
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uuidRandomBytesSize = 10 // UUID中随机字节部分的大小
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uuidVersion7 = 0x7000 // UUID v7的版本位
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uuidVariant = 0x80 // UUID的变体位
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uuidTimeMask = 0xFFFF // 时间戳掩码
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uuidTimeShift = 16 // 时间戳位移
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uuidVariantMask = 0x3F // 变体掩码
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)
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// NewUUIDv7 生成 UUID v7 并去除连字符.
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func NewUUIDv7() string {
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// 获取当前时间戳（Unix 毫秒时间戳）
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now := time.Now().UnixMilli()
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// 生成随机字节
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randBytes := make([]byte, uuidRandomBytesSize)
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_, err := rand.Read(randBytes)
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if err != nil {
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// 如果随机数生成失败，使用时间戳加一些伪随机值作为备选方案
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return fmt.Sprintf("%016x%016x", now, time.Now().UnixNano())
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}
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// 版本和变体位
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// 版本: 0x7 (0111) << 12
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// 变体: 0x2 (10) << 6
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versionVariant := uint16(uuidVersion7 | uuidVariant)
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// 构建 UUID 字节数组
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var uuid [16]byte
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// 时间戳低32位 (4 bytes)
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//nolint:gosec // UUID格式要求的类型转换
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binary.BigEndian.PutUint32(uuid[0:4], uint32(now>>uuidTimeShift))
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// 时间戳中16位 + 版本 (2 bytes)
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//nolint:gosec // UUID格式要求的类型转换
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binary.BigEndian.PutUint16(uuid[4:6], uint16(now&uuidTimeMask))
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// 时间戳高16位 + 变体 (2 bytes)
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binary.BigEndian.PutUint16(uuid[6:8], versionVariant)
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// 随机数部分 (8 bytes)
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copy(uuid[8:16], randBytes[:8])
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// 设置变体位 (第8个字节的高两位为10)
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uuid[8] = (uuid[8] & uuidVariantMask) | uuidVariant
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// 转换为十六进制字符串并去除连字符
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return fmt.Sprintf("%08x%04x%04x%04x%08x%04x",
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binary.BigEndian.Uint32(uuid[0:4]),
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binary.BigEndian.Uint16(uuid[4:6]),
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binary.BigEndian.Uint16(uuid[6:8]),
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binary.BigEndian.Uint16(uuid[8:10]),
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binary.BigEndian.Uint32(uuid[10:14]),
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binary.BigEndian.Uint16(uuid[14:16]))
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}
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