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author | Péter Szilágyi <peterke@gmail.com> | 2016-07-14 16:22:58 +0800 |
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committer | Péter Szilágyi <peterke@gmail.com> | 2016-07-15 21:52:55 +0800 |
commit | 2c2e389b778b490fcaf14d9cc45a750647ca5c68 (patch) | |
tree | 0534f50f26ce5f62b1acaf0c18667b6cc0998103 /core/dao.go | |
parent | 3291235711082759cd7b70253c02150a80d57011 (diff) | |
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cmd, core, eth, miner, params, tests: finalize the DAO fork
Diffstat (limited to 'core/dao.go')
-rw-r--r-- | core/dao.go | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/core/dao.go b/core/dao.go new file mode 100644 index 000000000..e315c9884 --- /dev/null +++ b/core/dao.go @@ -0,0 +1,74 @@ +// Copyright 2016 The go-ethereum Authors +// This file is part of the go-ethereum library. +// +// The go-ethereum 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 go-ethereum 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>. + +package core + +import ( + "bytes" + "math/big" + + "github.com/ethereum/go-ethereum/core/state" + "github.com/ethereum/go-ethereum/core/types" + "github.com/ethereum/go-ethereum/params" +) + +// ValidateDAOHeaderExtraData 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 ValidateDAOHeaderExtraData(config *ChainConfig, header *types.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 whether we support or oppose the fork, validate the extra-data contents + if config.DAOForkSupport { + if bytes.Compare(header.Extra, params.DAOForkBlockExtra) != 0 { + return ValidationError("DAO pro-fork bad block extra-data: 0x%x", header.Extra) + } + } else { + if bytes.Compare(header.Extra, params.DAOForkBlockExtra) == 0 { + return ValidationError("DAO no-fork bad block extra-data: 0x%x", header.Extra) + } + } + // 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.StateDB) { + // Retrieve the contract to refund balances into + refund := statedb.GetOrNewStateObject(params.DAORefundContract) + + // Move every DAO account and extra-balance account funds into the refund contract + for _, addr := range params.DAODrainList { + if account := statedb.GetStateObject(addr); account != nil { + refund.AddBalance(account.Balance()) + account.SetBalance(new(big.Int)) + } + } +} |