/
rollback_proof.go
69 lines (59 loc) · 1.73 KB
/
rollback_proof.go
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package consensus
import (
"time"
"github.com/go-errors/errors"
"github.com/koinotice/vite/common/types"
"github.com/koinotice/vite/ledger"
)
var NotFoundBlock = errors.New("block not found")
type RollbackProof interface {
Proof(hash types.Hash, t time.Time) (*ledger.SnapshotBlock, error)
ProofEmpty(stime time.Time, etime time.Time) (bool, error)
ProofHash(t time.Time) (types.Hash, error)
}
type rollbackProof struct {
rw Chain
}
func (self *rollbackProof) ProofEmpty(stime time.Time, etime time.Time) (bool, error) {
block, err := self.rw.GetSnapshotHeaderBeforeTime(&etime)
if err != nil {
return false, err
}
if block == nil {
return false, errors.Errorf("before time[%s] block not exist", etime.String())
}
if !etime.After(*block.Timestamp) {
return false, errors.Errorf("GetSnapshotHeaderBeforeTime fail. [%s]-[%s]", etime, block.Timestamp)
}
if block.Timestamp.Before(stime) {
return true, nil
} else {
return false, nil
}
}
func (self *rollbackProof) ProofHash(t time.Time) (types.Hash, error) {
block, err := self.rw.GetSnapshotHeaderBeforeTime(&t)
if err != nil {
return types.Hash{}, err
}
if block == nil {
return types.Hash{}, errors.New("before time[" + t.String() + "] block not exist")
}
return block.Hash, err
}
func (self *rollbackProof) Proof(hash types.Hash, t time.Time) (*ledger.SnapshotBlock, error) {
block, err := self.rw.GetSnapshotHeaderBeforeTime(&t)
if err != nil {
return nil, err
}
if block == nil {
return nil, errors.New("before time[" + t.String() + "] block not exist")
}
if block.Hash != hash {
return nil, errors.Errorf("block[%s][%s] proof fail.", hash, block.Hash)
}
return block, nil
}
func newRollbackProof(rw Chain) *rollbackProof {
return &rollbackProof{rw: rw}
}