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dao.go
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dao.go
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// Copyright 2023 The AmazeChain Authors
// This file is part of the AmazeChain library.
//
// The AmazeChain library 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 AmazeChain library 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 AmazeChain library. If not, see <http://www.gnu.org/licenses/>.
package misc
import (
"errors"
"github.com/amazechain/amc/params"
"github.com/amazechain/amc/modules/state"
"github.com/holiman/uint256"
)
var (
// ErrBadProDAOExtra is returned if a header doesn't support the DAO fork on a
// pro-fork client.
ErrBadProDAOExtra = errors.New("bad DAO pro-fork extra-data")
// ErrBadNoDAOExtra is returned if a header does support the DAO fork on a no-
// fork client.
ErrBadNoDAOExtra = errors.New("bad DAO no-fork extra-data")
)
// VerifyDAOHeaderExtraData validates the extra-data field of a block header to
// ensure it conforms to DAO hard-fork rules.
//
// DAO hard-fork extension to the header validity:
//
// a) if the node is no-fork, do not accept blocks in the [fork, fork+10) range
// with the fork specific extra-data set
// b) if the node is pro-fork, require blocks in the specific range to have the
// unique extra-data set.
//func VerifyDAOHeaderExtraData(config *params.ChainConfig, header *block.Header) error {
// // Short circuit validation if the node doesn't care about the DAO fork
// if config.DAOForkBlock == nil {
// return nil
// }
// // Make sure the block is within the fork's modified extra-data range
// limit := new(big.Int).Add(config.DAOForkBlock, params.DAOForkExtraRange)
// if header.Number.Cmp(config.DAOForkBlock) < 0 || header.Number.Cmp(limit) >= 0 {
// return nil
// }
// // Depending on whether we support or oppose the fork, validate the extra-data contents
// if config.DAOForkSupport {
// if !bytes.Equal(header.Extra, params.DAOForkBlockExtra) {
// return ErrBadProDAOExtra
// }
// } else {
// if bytes.Equal(header.Extra, params.DAOForkBlockExtra) {
// return ErrBadNoDAOExtra
// }
// }
// // All ok, header has the same extra-data we expect
// return nil
//}
// ApplyDAOHardFork modifies the state database according to the DAO hard-fork
// rules, transferring all balances of a set of DAO accounts to a single refund
// contract.
func ApplyDAOHardFork(statedb *state.IntraBlockState) {
// Retrieve the contract to refund balances into
if !statedb.Exist(params.DAORefundContract) {
statedb.CreateAccount(params.DAORefundContract, false)
}
// Move every DAO account and extra-balance account funds into the refund contract
for _, addr := range params.DAODrainList() {
statedb.AddBalance(params.DAORefundContract, statedb.GetBalance(addr))
statedb.SetBalance(addr, new(uint256.Int))
}
}