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add cache list on next method #7

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7 changes: 7 additions & 0 deletions main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,12 @@ func main() {
Value: 0,
Usage: "snowflake machine id, 0-1023",
},
&cli.IntFlag{
Name: "incr-step",
Value: 1,
Usage: "auto increment step for cache",
EnvVars: []string{"INCR_STEP"},
},
&cli.StringFlag{
Name: "pk-root",
Value: "/seqs",
Expand All @@ -52,6 +58,7 @@ func main() {
log.Println("machine-id:", c.Int("machine-id"))
log.Println("pk-root:", c.String("pk-root"))
log.Println("uuid-key:", c.String("uuid-key"))
log.Println("incr-step:", c.Int("incr-step"))
// 监听
lis, err := net.Listen("tcp", c.String("listen"))
if err != nil {
Expand Down
86 changes: 60 additions & 26 deletions service.go
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Original file line number Diff line number Diff line change
Expand Up @@ -29,11 +29,14 @@ const (
)

type server struct {
pkroot string
uuidkey string
machine_id uint64 // 10-bit machine id
ch_proc chan chan uint64
muNext sync.Mutex
pkroot string
uuidkey string
machine_id uint64 // 10-bit machine id
ch_proc chan chan uint64
incr_step int64
incr_pendings map[string][]int64
incr_use_cache bool
muNext sync.Mutex
}

func (s *server) init(c *cli.Context) {
Expand All @@ -43,39 +46,70 @@ func (s *server) init(c *cli.Context) {
s.machine_id = (uint64(c.Int("machine-id")) & MACHINE_ID_MASK) << 12
s.pkroot = c.String("pk-root")
s.uuidkey = c.String("uuid-key")
s.incr_step = int64(c.Int("incr-step"))

if s.incr_step > 1 {
s.incr_use_cache = true
s.incr_pendings = make(map[string][]int64)
}

go s.uuid_task()
}

// get next value of a key, like auto-increment in mysql
func (s *server) Next(ctx context.Context, in *pb.Snowflake_Key) (*pb.Snowflake_Value, error) {
s.muNext.Lock()
defer s.muNext.Unlock()
client := etcdclient.KeysAPI()
key := s.pkroot + "/" + in.Name
for {
// get the key
resp, err := client.Get(context.Background(), key, nil)
if err != nil {
log.Error(err)
return nil, errors.New("Key not exists, need to create first")
}

// get prevValue & prevIndex
prevValue, err := strconv.Atoi(resp.Node.Value)
if err != nil {
log.Error(err)
return nil, errors.New("marlformed value")
if s.incr_use_cache {
if _, ok := s.incr_pendings[in.Name]; !ok {
s.incr_pendings[in.Name] = make([]int64, 0, int(s.incr_step))
}
prevIndex := resp.Node.ModifiedIndex
}

if !s.incr_use_cache || len(s.incr_pendings[in.Name]) == 0 {
client := etcdclient.KeysAPI()
key := s.pkroot + "/" + in.Name
for {
// get the key
resp, err := client.Get(context.Background(), key, nil)
if err != nil {
log.Error(err)
return nil, errors.New("Key not exists, need to create first")
}

// CompareAndSwap
resp, err = client.Set(context.Background(), key, fmt.Sprint(prevValue+1), &etcd.SetOptions{PrevIndex: prevIndex})
if err != nil {
log.Warn(err)
continue
// get prevValue & prevIndex
prevValue, err := strconv.ParseInt(resp.Node.Value, 10, 64)
if err != nil {
log.Error(err)
return nil, errors.New("marlformed value")
}
prevIndex := resp.Node.ModifiedIndex

nextValue := prevValue + s.incr_step
// CompareAndSwap
resp, err = client.Set(context.Background(), key, fmt.Sprint(nextValue), &etcd.SetOptions{PrevIndex: prevIndex})
if err != nil {
log.Warn(err)
continue
}

// cache value list
if s.incr_use_cache {
for i := prevValue + 1; i <= nextValue; i++ {
s.incr_pendings[in.Name] = append(s.incr_pendings[in.Name], i)
}

break
}

return &pb.Snowflake_Value{nextValue}, nil
}
return &pb.Snowflake_Value{int64(prevValue + 1)}, nil
}

nextId := s.incr_pendings[in.Name][0]
s.incr_pendings[in.Name] = s.incr_pendings[in.Name][1:]
return &pb.Snowflake_Value{nextId}, nil
}

// generate an unique uuid
Expand Down