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core/state: fix bug in copy of copy State

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This commit is contained in:
Martin Holst Swende 2018-04-10 20:59:07 +02:00
parent 2e247705cd
commit 0c7b99b8cc
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2 changed files with 26 additions and 0 deletions
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10
core/state/statedb.go
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@ -474,6 +474,16 @@ func (self *StateDB) Copy() *StateDB {
state.stateObjects[addr] = self.stateObjects[addr].deepCopy(state)
state.stateObjectsDirty[addr] = struct{}{}
}
// Above, we don't copy the actual journal. This means that if the copy is copied, the
// loop above will be a no-op, since the copy's journal is empty.
// Thus, here we iterate over stateObjects, to enable copies of copies
for addr := range self.stateObjectsDirty {
if _, exist := state.stateObjects[addr]; !exist {
state.stateObjects[addr] = self.stateObjects[addr].deepCopy(state)
state.stateObjectsDirty[addr] = struct{}{}
}
}
for hash, logs := range self.logs {
state.logs[hash] = make([]*types.Log, len(logs))
copy(state.logs[hash], logs)

16
core/state/statedb_test.go
View File

@ -422,3 +422,19 @@ func (s *StateSuite) TestTouchDelete(c *check.C) {
c.Fatal("expected no dirty state object")
}
}
// TestCopyOfCopy tests that modified objects are carried over to the copy, and the copy of the copy.
// See https://github.com/ethereum/go-ethereum/pull/15225#issuecomment-380191512
func TestCopyOfCopy(t *testing.T) {
db, _ := ethdb.NewMemDatabase()
sdb, _ := New(common.Hash{}, NewDatabase(db))
addr := common.HexToAddress("aaaa")
sdb.SetBalance(addr, big.NewInt(42))
if got := sdb.Copy().GetBalance(addr).Uint64(); got != 42 {
t.Fatalf("1st copy fail, expected 42, got %v", got)
}
if got := sdb.Copy().Copy().GetBalance(addr).Uint64(); got != 42 {
t.Fatalf("2nd copy fail, expected 42, got %v", got)
}
}