/
snow_flakes.go
63 lines (49 loc) · 1.15 KB
/
snow_flakes.go
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package utils
import (
"fmt"
"sync"
"github.com/sony/sonyflake"
"github.com/east-eden/server/define"
)
type Snowflakes struct {
ids []*sonyflake.Sonyflake
once sync.Once
}
var sfs Snowflakes
func init() {
sfs.ids = make([]*sonyflake.Sonyflake, 0, define.SnowFlake_End)
}
// snow flakes machine_id: 10 bits machineID + 6 bits plugin_type
func InitMachineID(machineID int16) {
sfs.once.Do(func() {
for n := 0; n < define.SnowFlake_End; n++ {
var st sonyflake.Settings
st.MachineID = func() (uint16, error) {
newID := uint16(machineID<<6) + uint16(n)
return newID, nil
}
sf := sonyflake.NewSonyflake(st)
if sf == nil {
panic("sonyflake not created")
}
sfs.ids = append(sfs.ids, sf)
}
})
}
func NextID(tp int) (int64, error) {
if tp < 0 || tp >= define.SnowFlake_End {
return -1, fmt.Errorf("wrong id generated, type:%d", tp)
}
id, err := sfs.ids[tp].NextID()
return int64(id), err
}
func MachineID(id int64) int16 {
m := sonyflake.Decompose(uint64(id))
return int16(m["machine-id"])
}
func MachineIDHigh(id int64) int16 {
return MachineID(id) >> 6
}
func MachineIDLow(id int64) int16 {
return MachineID(id) & 15
}