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persister.go
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persister.go
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package raft
/*
用于支持 Raft 和 kvraft 的持久化,保存 Raft 状态(日志等)和 k/v 服务器快照。
我们将使用原始的 persister.go 文件对您的代码进行评分测试。
因此,虽然您可以修改此代码以帮助进行调试,请在提交之前使用原始文件进行测试。
*/
import "sync"
type Persister struct {
mu sync.Mutex
raftstate []byte
snapshot []byte
}
func MakePersister() *Persister {
return &Persister{}
}
func clone(orig []byte) []byte {
x := make([]byte, len(orig))
copy(x, orig)
return x
}
func (ps *Persister) Copy() *Persister {
ps.mu.Lock()
defer ps.mu.Unlock()
np := MakePersister()
np.raftstate = ps.raftstate
np.snapshot = ps.snapshot
return np
}
func (ps *Persister) SaveRaftState(state []byte) {
ps.mu.Lock()
defer ps.mu.Unlock()
ps.raftstate = clone(state)
}
func (ps *Persister) ReadRaftState() []byte {
ps.mu.Lock()
defer ps.mu.Unlock()
return clone(ps.raftstate)
}
func (ps *Persister) RaftStateSize() int {
ps.mu.Lock()
defer ps.mu.Unlock()
return len(ps.raftstate)
}
// Save both Raft state and K/V snapshot as a single atomic action,
// to help avoid them getting out of sync.
func (ps *Persister) SaveStateAndSnapshot(state []byte, snapshot []byte) {
ps.mu.Lock()
defer ps.mu.Unlock()
ps.raftstate = clone(state)
ps.snapshot = clone(snapshot)
}
func (ps *Persister) ReadSnapshot() []byte {
ps.mu.Lock()
defer ps.mu.Unlock()
return clone(ps.snapshot)
}
func (ps *Persister) SnapshotSize() int {
ps.mu.Lock()
defer ps.mu.Unlock()
return len(ps.snapshot)
}