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store_id.go
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store_id.go
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// Copyright 2016 DeepFabric, Inc.
//
// 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 pdserver
import (
"github.com/coreos/etcd/clientv3"
"github.com/fagongzi/util/format"
)
// GetID returns current id
func (s *pdStore) GetID() (uint64, error) {
resp, err := s.getValue(pdIDPath)
if err != nil {
return 0, err
}
if resp == nil {
return 0, nil
}
return format.BytesToUint64(resp)
}
// CreateID create id alloc info.
func (s *pdStore) CreateID(leaderSignature string, value uint64) error {
cmp := clientv3.Compare(clientv3.CreateRevision(pdIDPath), "=", 0)
op := clientv3.OpPut(pdIDPath, string(format.Uint64ToBytes(value)))
resp, err := s.leaderTxn(leaderSignature, cmp).Then(op).Commit()
if err != nil {
return err
}
if !resp.Succeeded {
return errMaybeNotLeader
}
return nil
}
// UpdateID update id for alloc.
func (s *pdStore) UpdateID(leaderSignature string, old, value uint64) error {
cmp := clientv3.Compare(clientv3.Value(pdIDPath), "=", string(format.Uint64ToBytes(old)))
op := clientv3.OpPut(pdIDPath, string(format.Uint64ToBytes(value)))
resp, err := s.leaderTxn(leaderSignature, cmp).Then(op).Commit()
if err != nil {
return err
}
if !resp.Succeeded {
return errMaybeNotLeader
}
return nil
}