feat(uuid):完成UUID和短UUID生成功能。

serial_code/uuid/short_uuid.go

@@ -0,0 +1,65 @@
+package uuid
+
+import (
+	"unsafe"
+
+	"github.com/google/uuid"
+)
+
+const (
+	letters    = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
+	MIN_LENGTH = 2 // 最小长度为2的原因是Go中整型长度最大为64位，而UUID v4是128位长，所以最小长度为2。
+	MAX_LENGTH = 128
+)
+
+// 将一个字节拆分成8个比特位，并以一个8位长字节数组输出。
+func breakByte(b byte) []byte {
+	bytes := make([]byte, 8)
+	for i := byte(0); i < 8; i++ {
+		mask := byte(0x1) << (7 - i)
+		bytes[i] = (b & mask) >> (7 - i)
+	}
+	return bytes
+}
+
+// 根据UUID v4生成一个指定长度的短UUID字符串。
+func ShortUUID(length uint) string {
+	var uuidLength uint
+	if length < MIN_LENGTH {
+		uuidLength = MIN_LENGTH
+	} else if length > MAX_LENGTH {
+		uuidLength = MAX_LENGTH
+	} else {
+		uuidLength = length
+	}
+	// UUID是一个16字节长的字节数组，每个字节都可以拆分成8个比特位，共128比特位。
+	newUUID := uuid.New()
+	uuidBits := make([]byte, 0)
+	for _, b := range newUUID[:] {
+		uuidBits = append(uuidBits, breakByte(b)...)
+	}
+	var partitionLength uint = 0
+	if 128%uuidLength == 0 {
+		partitionLength = 128 / uuidLength
+	} else {
+		partitionLength = 128/uuidLength + 1
+	}
+	var paritionedUUID = make([][]byte, uuidLength)
+	for i := uint(0); i < uuidLength; i++ {
+		if i != uuidLength-1 {
+			paritionedUUID[i] = uuidBits[i*partitionLength : (i+1)*partitionLength]
+		} else {
+			paritionedUUID[i] = uuidBits[i*partitionLength:]
+		}
+	}
+	result := make([]byte, uuidLength)
+	for i := uint(0); i < uuidLength; i++ {
+		var assembledRune uint64 = 0
+		for j := uint(0); j < uint(len(paritionedUUID[i])); j++ {
+			assembledRune |= uint64(paritionedUUID[i][j]) << (partitionLength - j - 1)
+		}
+		result[i] = letters[assembledRune%uint64(len(letters))]
+	}
+
+	return *(*string)(unsafe.Pointer(&result))
+}

serial_code/uuid/uuid.go

@@ -0,0 +1,19 @@
+// 提供UUID v4生成功能以及基于UUID v4生成短UUID的功能。
+package uuid
+
+import (
+	"encoding/hex"
+
+	"github.com/google/uuid"
+)
+
+// 生成一个UUID v4字节数组。
+func New() []byte {
+	newID := uuid.New()
+	return newID[:]
+}
+
+// 生成一个UUID v4字符串。
+func NewString() string {
+	return hex.EncodeToString(New())
+}