add: anowflake email kafka, refa: redis connectg

2026-02-25 01:16:13 +08:00
parent fdbcde13b2
commit 300058ad01
67 changed files with 3596 additions and 139 deletions
@@ -0,0 +1,94 @@
+package generator
+
+import (
+	"errors"
+	"sync"
+	"time"
+)
+
+const (
+	epoch            = int64(1609459200000)
+	datacenterIdBits = uint(5)
+	workerIdBits     = uint(5)
+	sequenceBits     = uint(12)
+
+	maxDatacenterId = -1 ^ (-1 << datacenterIdBits)
+	maxWorkerId     = -1 ^ (-1 << workerIdBits)
+	maxSequence     = -1 ^ (-1 << sequenceBits)
+
+	workerIdShift      = sequenceBits
+	datacenterIdShift  = sequenceBits + workerIdBits
+	timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits
+)
+
+type Snowflake struct {
+	mu           sync.Mutex
+	timestamp    int64
+	datacenterId int64
+	workerId     int64
+	sequence     int64
+}
+
+func NewSnowflake(datacenterId, workerId int64) (*Snowflake, error) {
+	if datacenterId < 0 || datacenterId > maxDatacenterId {
+		return nil, errors.New("datacenter id must be between 0 and 31")
+	}
+	if workerId < 0 || workerId > maxWorkerId {
+		return nil, errors.New("worker id must be between 0 and 31")
+	}
+
+	return &Snowflake{
+		timestamp:    0,
+		datacenterId: datacenterId,
+		workerId:     workerId,
+		sequence:     0,
+	}, nil
+}
+
+func (s *Snowflake) NextID() (int64, error) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	now := time.Now().UnixMilli()
+
+	if now < s.timestamp {
+		return 0, errors.New("clock moved backwards")
+	}
+
+	if now == s.timestamp {
+		s.sequence = (s.sequence + 1) & maxSequence
+		if s.sequence == 0 {
+			for now <= s.timestamp {
+				now = time.Now().UnixMilli()
+			}
+		}
+	} else {
+		s.sequence = 0
+	}
+
+	s.timestamp = now
+
+	id := ((now - epoch) << timestampLeftShift) |
+		(s.datacenterId << datacenterIdShift) |
+		(s.workerId << workerIdShift) |
+		s.sequence
+
+	return id, nil
+}
+
+func (s *Snowflake) NextIDs(count int) ([]int64, error) {
+	if count <= 0 || count > 1000 {
+		return nil, errors.New("count must be between 1 and 1000")
+	}
+
+	ids := make([]int64, count)
+	for i := 0; i < count; i++ {
+		id, err := s.NextID()
+		if err != nil {
+			return nil, err
+		}
+		ids[i] = id
+	}
+
+	return ids, nil
+}