mirror of
https://gitee.com/milvus-io/milvus.git
synced 2024-12-02 20:09:57 +08:00
69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
// Copyright 2016 TiKV Project Authors.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package server
|
|
|
|
import (
|
|
"context"
|
|
"math/rand"
|
|
"time"
|
|
|
|
"github.com/czs007/suvlim/errors"
|
|
"github.com/czs007/suvlim/util/etcdutil"
|
|
"github.com/czs007/suvlim/util/typeutil"
|
|
"go.etcd.io/etcd/clientv3"
|
|
)
|
|
|
|
const (
|
|
requestTimeout = etcdutil.DefaultRequestTimeout
|
|
)
|
|
|
|
func initOrGetClusterID(c *clientv3.Client, key string) (uint64, error) {
|
|
ctx, cancel := context.WithTimeout(c.Ctx(), requestTimeout)
|
|
defer cancel()
|
|
|
|
// Generate a random cluster ID.
|
|
ts := uint64(time.Now().Unix())
|
|
clusterID := (ts << 32) + uint64(rand.Uint32())
|
|
value := typeutil.Uint64ToBytes(clusterID)
|
|
|
|
// Multiple PDs may try to init the cluster ID at the same time.
|
|
// Only one PD can commit this transaction, then other PDs can get
|
|
// the committed cluster ID.
|
|
resp, err := c.Txn(ctx).
|
|
If(clientv3.Compare(clientv3.CreateRevision(key), "=", 0)).
|
|
Then(clientv3.OpPut(key, string(value))).
|
|
Else(clientv3.OpGet(key)).
|
|
Commit()
|
|
if err != nil {
|
|
return 0, errors.WithStack(err)
|
|
}
|
|
|
|
// Txn commits ok, return the generated cluster ID.
|
|
if resp.Succeeded {
|
|
return clusterID, nil
|
|
}
|
|
|
|
// Otherwise, parse the committed cluster ID.
|
|
if len(resp.Responses) == 0 {
|
|
return 0, errors.Errorf("txn returns empty response: %v", resp)
|
|
}
|
|
|
|
response := resp.Responses[0].GetResponseRange()
|
|
if response == nil || len(response.Kvs) != 1 {
|
|
return 0, errors.Errorf("txn returns invalid range response: %v", resp)
|
|
}
|
|
|
|
return typeutil.BytesToUint64(response.Kvs[0].Value)
|
|
}
|