/
utils.go
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/
utils.go
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/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ontology is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ontology. If not, see <http://www.gnu.org/licenses/>.
*/
package vbft
import (
"bytes"
"crypto/sha256"
"crypto/sha512"
"encoding/json"
"fmt"
"github.com/ontio/ontology-crypto/keypair"
"github.com/ontio/ontology-crypto/vrf"
"github.com/ontio/ontology/account"
"github.com/ontio/ontology/common"
"github.com/ontio/ontology/common/config"
vconfig "github.com/ontio/ontology/consensus/vbft/config"
"github.com/ontio/ontology/core/ledger"
"github.com/ontio/ontology/core/signature"
"github.com/ontio/ontology/core/states"
scommon "github.com/ontio/ontology/core/store/common"
"github.com/ontio/ontology/core/store/overlaydb"
gov "github.com/ontio/ontology/smartcontract/service/native/governance"
nutils "github.com/ontio/ontology/smartcontract/service/native/utils"
)
func SignMsg(account *account.Account, msg ConsensusMsg) ([]byte, error) {
data, err := msg.Serialize()
if err != nil {
return nil, fmt.Errorf("failed to marshal msg when signing: %s", err)
}
return signature.Sign(account, data)
}
func hashData(data []byte) common.Uint256 {
t := sha256.Sum256(data)
f := sha256.Sum256(t[:])
return common.Uint256(f)
}
func HashMsg(msg ConsensusMsg) (common.Uint256, error) {
// FIXME: has to do marshal on each call
data, err := SerializeVbftMsg(msg)
if err != nil {
return common.Uint256{}, fmt.Errorf("failed to marshal block: %s", err)
}
return hashData(data), nil
}
type seedData struct {
BlockNum uint32 `json:"block_num"`
PrevBlockProposer uint32 `json:"prev_block_proposer"`
VrfValue []byte `json:"vrf_value"`
}
func getParticipantSelectionSeed(block *Block) vconfig.VRFValue {
data, err := json.Marshal(&seedData{
BlockNum: block.getBlockNum() + 1,
PrevBlockProposer: block.getProposer(),
VrfValue: block.getVrfValue(),
})
if err != nil {
return vconfig.VRFValue{}
}
t := sha512.Sum512(data)
f := sha512.Sum512(t[:])
return vconfig.VRFValue(f)
}
type vrfData struct {
BlockNum uint32 `json:"block_num"`
PrevVrf []byte `json:"prev_vrf"`
}
func computeVrf(sk keypair.PrivateKey, blkNum uint32, prevVrf []byte) ([]byte, []byte, error) {
data, err := json.Marshal(&vrfData{
BlockNum: blkNum,
PrevVrf: prevVrf,
})
if err != nil {
return nil, nil, fmt.Errorf("computeVrf failed to marshal vrfData: %s", err)
}
return vrf.Vrf(sk, data)
}
func verifyVrf(pk keypair.PublicKey, blkNum uint32, prevVrf, newVrf, proof []byte) error {
data, err := json.Marshal(&vrfData{
BlockNum: blkNum,
PrevVrf: prevVrf,
})
if err != nil {
return fmt.Errorf("verifyVrf failed to marshal vrfData: %s", err)
}
result, err := vrf.Verify(pk, data, newVrf, proof)
if err != nil {
return fmt.Errorf("verifyVrf failed: %s", err)
}
if !result {
return fmt.Errorf("verifyVrf failed")
}
return nil
}
func GetVbftConfigInfo(memdb *overlaydb.MemDB) (*config.VBFTConfig, error) {
//get governance view
goveranceview, err := GetGovernanceView(memdb)
if err != nil {
return nil, err
}
//get preConfig
preCfg := new(gov.PreConfig)
data, err := GetStorageValue(memdb, ledger.DefLedger, nutils.GovernanceContractAddress, []byte(gov.PRE_CONFIG))
if err != nil && err != scommon.ErrNotFound {
return nil, err
}
if data != nil {
err = preCfg.Deserialization(common.NewZeroCopySource(data))
if err != nil {
return nil, err
}
}
var chainconfig *config.VBFTConfig
if preCfg.SetView == goveranceview.View {
chainconfig = &config.VBFTConfig{
N: uint32(preCfg.Configuration.N),
C: uint32(preCfg.Configuration.C),
K: uint32(preCfg.Configuration.K),
L: uint32(preCfg.Configuration.L),
BlockMsgDelay: uint32(preCfg.Configuration.BlockMsgDelay),
HashMsgDelay: uint32(preCfg.Configuration.HashMsgDelay),
PeerHandshakeTimeout: uint32(preCfg.Configuration.PeerHandshakeTimeout),
MaxBlockChangeView: uint32(preCfg.Configuration.MaxBlockChangeView),
}
} else {
data, err := GetStorageValue(memdb, ledger.DefLedger, nutils.GovernanceContractAddress, []byte(gov.VBFT_CONFIG))
if err != nil {
return nil, err
}
cfg := new(gov.Configuration)
err = cfg.Deserialization(common.NewZeroCopySource(data))
if err != nil {
return nil, err
}
chainconfig = &config.VBFTConfig{
N: uint32(cfg.N),
C: uint32(cfg.C),
K: uint32(cfg.K),
L: uint32(cfg.L),
BlockMsgDelay: uint32(cfg.BlockMsgDelay),
HashMsgDelay: uint32(cfg.HashMsgDelay),
PeerHandshakeTimeout: uint32(cfg.PeerHandshakeTimeout),
MaxBlockChangeView: uint32(cfg.MaxBlockChangeView),
}
}
return chainconfig, nil
}
func GetPeersConfig(memdb *overlaydb.MemDB) ([]*config.VBFTPeerStakeInfo, error) {
goveranceview, err := GetGovernanceView(memdb)
if err != nil {
return nil, err
}
viewBytes := gov.GetUint32Bytes(goveranceview.View)
key := append([]byte(gov.PEER_POOL), viewBytes...)
data, err := GetStorageValue(memdb, ledger.DefLedger, nutils.GovernanceContractAddress, key)
if err != nil {
return nil, err
}
peerMap := &gov.PeerPoolMap{
PeerPoolMap: make(map[string]*gov.PeerPoolItem),
}
err = peerMap.Deserialization(common.NewZeroCopySource(data))
if err != nil {
return nil, err
}
var peerstakes []*config.VBFTPeerStakeInfo
for _, id := range peerMap.PeerPoolMap {
if id.Status == gov.CandidateStatus || id.Status == gov.ConsensusStatus {
config := &config.VBFTPeerStakeInfo{
Index: uint32(id.Index),
PeerPubkey: id.PeerPubkey,
InitPos: id.InitPos + id.TotalPos,
}
peerstakes = append(peerstakes, config)
}
}
return peerstakes, nil
}
func isUpdate(memdb *overlaydb.MemDB, view uint32) (bool, error) {
goveranceview, err := GetGovernanceView(memdb)
if err != nil {
return false, err
}
if goveranceview.View > view {
return true, nil
}
return false, nil
}
func getRawStorageItemFromMemDb(memdb *overlaydb.MemDB, addr common.Address, key []byte) (value []byte, unkown bool) {
rawKey := make([]byte, 0, 1+common.ADDR_LEN+len(key))
rawKey = append(rawKey, byte(scommon.ST_STORAGE))
rawKey = append(rawKey, addr[:]...)
rawKey = append(rawKey, key...)
return memdb.Get(rawKey)
}
func GetStorageValue(memdb *overlaydb.MemDB, backend *ledger.Ledger, addr common.Address, key []byte) (value []byte, err error) {
if memdb == nil {
return backend.GetStorageItem(addr, key)
}
rawValue, unknown := getRawStorageItemFromMemDb(memdb, addr, key)
if unknown {
return backend.GetStorageItem(addr, key)
}
if len(rawValue) == 0 {
return nil, scommon.ErrNotFound
}
value, err = states.GetValueFromRawStorageItem(rawValue)
return
}
func GetGovernanceView(memdb *overlaydb.MemDB) (*gov.GovernanceView, error) {
value, err := GetStorageValue(memdb, ledger.DefLedger, nutils.GovernanceContractAddress, []byte(gov.GOVERNANCE_VIEW))
if err != nil {
return nil, err
}
governanceView := new(gov.GovernanceView)
err = governanceView.Deserialize(bytes.NewBuffer(value))
if err != nil {
return nil, err
}
return governanceView, nil
}
func getChainConfig(memdb *overlaydb.MemDB, blkNum uint32) (*vconfig.ChainConfig, error) {
config, err := GetVbftConfigInfo(memdb)
if err != nil {
return nil, fmt.Errorf("failed to get chainconfig from leveldb: %s", err)
}
peersinfo, err := GetPeersConfig(memdb)
if err != nil {
return nil, fmt.Errorf("failed to get peersinfo from leveldb: %s", err)
}
goverview, err := GetGovernanceView(memdb)
if err != nil {
return nil, fmt.Errorf("failed to get governanceview failed:%s", err)
}
cfg, err := vconfig.GenesisChainConfig(config, peersinfo, goverview.TxHash, blkNum)
if err != nil {
return nil, fmt.Errorf("GenesisChainConfig failed: %s", err)
}
cfg.View = goverview.View
return cfg, err
}