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core, core/state: move gas tracking out of core/state

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The amount of gas available for tx execution was tracked in the
StateObject representing the coinbase account. This commit makes the gas
counter a separate type in package core, which avoids unintended
consequences of intertwining the counter with state logic.
This commit is contained in:
Felix Lange
2015-09-02 12:55:11 +02:00
parent 10ed107ba2
commit de8d5aaa92
10 changed files with 92 additions and 142 deletions
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39
core/state/errors.go
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@ -1,39 +0,0 @@
// Copyright 2014 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 state
import (
"fmt"
"math/big"
)
type GasLimitErr struct {
Message string
Is, Max *big.Int
}
func IsGasLimitErr(err error) bool {
_, ok := err.(*GasLimitErr)
return ok
}
func (err *GasLimitErr) Error() string {
return err.Message
}
func GasLimitError(is, max *big.Int) *GasLimitErr {
return &GasLimitErr{Message: fmt.Sprintf("GasLimit error. Max %s, transaction would take it to %s", max, is), Is: is, Max: max}
}

37
core/state/state_object.go
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@ -75,11 +75,6 @@ type StateObject struct {
// Cached storage (flushed when updated)
storage Storage
// Total gas pool is the total amount of gas currently
// left if this object is the coinbase. Gas is directly
// purchased of the coinbase.
gasPool *big.Int
// Mark for deletion
// When an object is marked for deletion it will be delete from the trie
// during the "update" phase of the state transition
@ -89,10 +84,9 @@ type StateObject struct {
}
func NewStateObject(address common.Address, db ethdb.Database) *StateObject {
object := &StateObject{db: db, address: address, balance: new(big.Int), gasPool: new(big.Int), dirty: true}
object := &StateObject{db: db, address: address, balance: new(big.Int), dirty: true}
object.trie, _ = trie.NewSecure(common.Hash{}, db)
object.storage = make(Storage)
object.gasPool = new(big.Int)
return object
}
@ -121,7 +115,6 @@ func NewStateObjectFromBytes(address common.Address, data []byte, db ethdb.Datab
object.codeHash = extobject.CodeHash
object.trie = trie
object.storage = make(map[string]common.Hash)
object.gasPool = new(big.Int)
object.code, _ = db.Get(extobject.CodeHash)
return object
}
@ -209,36 +202,9 @@ func (c *StateObject) St() Storage {
return c.storage
}
//
// Gas setters and getters
//
// Return the gas back to the origin. Used by the Virtual machine or Closures
func (c *StateObject) ReturnGas(gas, price *big.Int) {}
func (self *StateObject) SetGasLimit(gasLimit *big.Int) {
self.gasPool = new(big.Int).Set(gasLimit)
self.dirty = true
if glog.V(logger.Core) {
glog.Infof("%x: gas (+ %v)", self.Address(), self.gasPool)
}
}
func (self *StateObject) SubGas(gas, price *big.Int) error {
if self.gasPool.Cmp(gas) < 0 {
return GasLimitError(self.gasPool, gas)
}
self.gasPool.Sub(self.gasPool, gas)
self.dirty = true
return nil
}
func (self *StateObject) AddGas(gas, price *big.Int) {
self.gasPool.Add(self.gasPool, gas)
self.dirty = true
}
func (self *StateObject) Copy() *StateObject {
stateObject := NewStateObject(self.Address(), self.db)
stateObject.balance.Set(self.balance)
@ -248,7 +214,6 @@ func (self *StateObject) Copy() *StateObject {
stateObject.code = common.CopyBytes(self.code)
stateObject.initCode = common.CopyBytes(self.initCode)
stateObject.storage = self.storage.Copy()
stateObject.gasPool.Set(self.gasPool)
stateObject.remove = self.remove
stateObject.dirty = self.dirty
stateObject.deleted = self.deleted

5
core/state/state_test.go
View File

@ -138,7 +138,6 @@ func TestSnapshot2(t *testing.T) {
so0 := state.GetStateObject(stateobjaddr0)
so0.balance = big.NewInt(42)
so0.nonce = 43
so0.gasPool = big.NewInt(44)
so0.code = []byte{'c', 'a', 'f', 'e'}
so0.codeHash = so0.CodeHash()
so0.remove = true
@ -150,7 +149,6 @@ func TestSnapshot2(t *testing.T) {
so1 := state.GetStateObject(stateobjaddr1)
so1.balance = big.NewInt(52)
so1.nonce = 53
so1.gasPool = big.NewInt(54)
so1.code = []byte{'c', 'a', 'f', 'e', '2'}
so1.codeHash = so1.CodeHash()
so1.remove = true
@ -207,9 +205,6 @@ func compareStateObjects(so0, so1 *StateObject, t *testing.T) {
}
}
if so0.gasPool.Cmp(so1.gasPool) != 0 {
t.Fatalf("GasPool mismatch: have %v, want %v", so0.gasPool, so1.gasPool)
}
if so0.remove != so1.remove {
t.Fatalf("Remove mismatch: have %v, want %v", so0.remove, so1.remove)
}