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authorPéter Szilágyi <peterke@gmail.com>2016-07-14 16:22:58 +0800
committerPéter Szilágyi <peterke@gmail.com>2016-07-15 21:52:55 +0800
commit2c2e389b778b490fcaf14d9cc45a750647ca5c68 (patch)
tree0534f50f26ce5f62b1acaf0c18667b6cc0998103 /core/dao.go
parent3291235711082759cd7b70253c02150a80d57011 (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.go74
1 files changed, 74 insertions, 0 deletions
diff --git a/core/dao.go b/core/dao.go
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+// 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))
+ }
+ }
+}