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