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authorPéter Szilágyi <peterke@gmail.com>2016-01-20 18:09:24 +0800
committerPéter Szilágyi <peterke@gmail.com>2016-01-20 18:09:24 +0800
commit886478b18b73bbe8421531f1a71664a2bc0f5eeb (patch)
tree230986c30bc908eadfcd8b3f862e43ee2dba7d4d /trie
parent5945a33350ea6e8bfc6308826efe16aab0e2e93d (diff)
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core/state, trie: don't leak database writes before commit
Diffstat (limited to 'trie')
-rw-r--r--trie/secure_trie.go49
1 files changed, 44 insertions, 5 deletions
diff --git a/trie/secure_trie.go b/trie/secure_trie.go
index caeef3c3a..ca515aacb 100644
--- a/trie/secure_trie.go
+++ b/trie/secure_trie.go
@@ -40,9 +40,10 @@ var secureKeyPrefix = []byte("secure-key-")
type SecureTrie struct {
*Trie
- hash hash.Hash
- secKeyBuf []byte
- hashKeyBuf []byte
+ hash hash.Hash
+ hashKeyBuf []byte
+ secKeyBuf []byte
+ secKeyCache map[string][]byte
}
// NewSecure creates a trie with an existing root node from db.
@@ -59,7 +60,10 @@ func NewSecure(root common.Hash, db Database) (*SecureTrie, error) {
if err != nil {
return nil, err
}
- return &SecureTrie{Trie: trie}, nil
+ return &SecureTrie{
+ Trie: trie,
+ secKeyCache: make(map[string][]byte),
+ }, nil
}
// Get returns the value for key stored in the trie.
@@ -105,7 +109,7 @@ func (t *SecureTrie) TryUpdate(key, value []byte) error {
if err != nil {
return err
}
- t.Trie.db.Put(t.secKey(hk), key)
+ t.secKeyCache[string(hk)] = key
return nil
}
@@ -125,10 +129,45 @@ func (t *SecureTrie) TryDelete(key []byte) error {
// GetKey returns the sha3 preimage of a hashed key that was
// previously used to store a value.
func (t *SecureTrie) GetKey(shaKey []byte) []byte {
+ if key, ok := t.secKeyCache[string(shaKey)]; ok {
+ return key
+ }
key, _ := t.Trie.db.Get(t.secKey(shaKey))
return key
}
+// Commit writes all nodes and the secure hash pre-images to the trie's database.
+// Nodes are stored with their sha3 hash as the key.
+//
+// Committing flushes nodes from memory. Subsequent Get calls will load nodes
+// from the database.
+func (t *SecureTrie) Commit() (root common.Hash, err error) {
+ return t.CommitTo(t.db)
+}
+
+// CommitTo writes all nodes and the secure hash pre-images to the given database.
+// Nodes are stored with their sha3 hash as the key.
+//
+// Committing flushes nodes from memory. Subsequent Get calls will load nodes from
+// the trie's database. Calling code must ensure that the changes made to db are
+// written back to the trie's attached database before using the trie.
+func (t *SecureTrie) CommitTo(db DatabaseWriter) (root common.Hash, err error) {
+ if len(t.secKeyCache) > 0 {
+ for hk, key := range t.secKeyCache {
+ if err := db.Put(t.secKey([]byte(hk)), key); err != nil {
+ return common.Hash{}, err
+ }
+ }
+ t.secKeyCache = make(map[string][]byte)
+ }
+ n, err := t.hashRoot(db)
+ if err != nil {
+ return (common.Hash{}), err
+ }
+ t.root = n
+ return common.BytesToHash(n.(hashNode)), nil
+}
+
func (t *SecureTrie) secKey(key []byte) []byte {
t.secKeyBuf = append(t.secKeyBuf[:0], secureKeyPrefix...)
t.secKeyBuf = append(t.secKeyBuf, key...)