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core/state: improve journal

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This commit is contained in:
Felix Lange 2016-09-27 12:22:34 +02:00
parent 4f2b554b35
commit 916666c3db
1 changed files with 2 additions and 10 deletions
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12
core/state/statedb.go
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@ -106,7 +106,8 @@ func (self *StateDB) Reset(root common.Hash) error {
return nil
}
// openTrie creates a trie. If a trie is available from the journal.
// openTrie creates a trie. It uses an existing trie if one is available
// from the journal if available.
func (self *StateDB) openTrie(root common.Hash) (*trie.SecureTrie, error) {
if self.trie != nil && self.trie.Hash() == root {
return self.trie, nil
@ -121,15 +122,6 @@ func (self *StateDB) openTrie(root common.Hash) (*trie.SecureTrie, error) {
}
func (self *StateDB) pushTrie(t *trie.SecureTrie) {
// Remove t's equivalent if it's already in the journal.
root := t.Hash()
for i := len(self.pastTries) - 1; i >= 0; i-- {
if self.pastTries[i].Hash() == root {
self.pastTries = append(self.pastTries[i:i], self.pastTries[i+1:]...)
break
}
}
// Insert.
if len(self.pastTries) >= maxJournalLength {
copy(self.pastTries, self.pastTries[1:])
self.pastTries[len(self.pastTries)-1] = t