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core, trie: intermediate mempool between trie and database (#15857)

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This commit reduces database I/O by not writing every state trie to disk.
This commit is contained in:
Péter Szilágyi
2018-02-05 18:40:32 +02:00
committed by Felix Lange
parent 59336283c0
commit 55599ee95d
69 changed files with 1958 additions and 1164 deletions
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38
core/state/statedb.go
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@ -36,6 +36,14 @@ type revision struct {
journalIndex int
}
var (
// emptyState is the known hash of an empty state trie entry.
emptyState = crypto.Keccak256Hash(nil)
// emptyCode is the known hash of the empty EVM bytecode.
emptyCode = crypto.Keccak256Hash(nil)
)
// StateDBs within the ethereum protocol are used to store anything
// within the merkle trie. StateDBs take care of caching and storing
// nested states. It's the general query interface to retrieve:
@ -235,6 +243,11 @@ func (self *StateDB) GetState(a common.Address, b common.Hash) common.Hash {
return common.Hash{}
}
// Database retrieves the low level database supporting the lower level trie ops.
func (self *StateDB) Database() Database {
return self.db
}
// StorageTrie returns the storage trie of an account.
// The return value is a copy and is nil for non-existent accounts.
func (self *StateDB) StorageTrie(a common.Address) Trie {
@ -568,8 +581,8 @@ func (s *StateDB) clearJournalAndRefund() {
s.refund = 0
}
// CommitTo writes the state to the given database.
func (s *StateDB) CommitTo(dbw trie.DatabaseWriter, deleteEmptyObjects bool) (root common.Hash, err error) {
// Commit writes the state to the underlying in-memory trie database.
func (s *StateDB) Commit(deleteEmptyObjects bool) (root common.Hash, err error) {
defer s.clearJournalAndRefund()
// Commit objects to the trie.
@ -583,13 +596,11 @@ func (s *StateDB) CommitTo(dbw trie.DatabaseWriter, deleteEmptyObjects bool) (ro
case isDirty:
// Write any contract code associated with the state object
if stateObject.code != nil && stateObject.dirtyCode {
if err := dbw.Put(stateObject.CodeHash(), stateObject.code); err != nil {
return common.Hash{}, err
}
s.db.TrieDB().Insert(common.BytesToHash(stateObject.CodeHash()), stateObject.code)
stateObject.dirtyCode = false
}
// Write any storage changes in the state object to its storage trie.
if err := stateObject.CommitTrie(s.db, dbw); err != nil {
if err := stateObject.CommitTrie(s.db); err != nil {
return common.Hash{}, err
}
// Update the object in the main account trie.
@ -598,7 +609,20 @@ func (s *StateDB) CommitTo(dbw trie.DatabaseWriter, deleteEmptyObjects bool) (ro
delete(s.stateObjectsDirty, addr)
}
// Write trie changes.
root, err = s.trie.CommitTo(dbw)
root, err = s.trie.Commit(func(leaf []byte, parent common.Hash) error {
var account Account
if err := rlp.DecodeBytes(leaf, &account); err != nil {
return nil
}
if account.Root != emptyState {
s.db.TrieDB().Reference(account.Root, parent)
}
code := common.BytesToHash(account.CodeHash)
if code != emptyCode {
s.db.TrieDB().Reference(code, parent)
}
return nil
})
log.Debug("Trie cache stats after commit", "misses", trie.CacheMisses(), "unloads", trie.CacheUnloads())
return root, err
}