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trie: remove Key in MissingNodeError

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The key was constructed from nibbles, which isn't possible for all
nodes. Remove the only use of Key in LightTrie by always retrying with
the original key that was looked up.
This commit is contained in:
Felix Lange
2017-04-18 13:08:17 +02:00
parent c7a4d9cf8a
commit a31d268b76
3 changed files with 4 additions and 17 deletions
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15
light/trie.go
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@ -19,6 +19,7 @@ package light
import (
"context"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/trie"
)
@ -46,26 +47,18 @@ func NewLightTrie(id *TrieID, odr OdrBackend, useFakeMap bool) *LightTrie {
// retrieveKey retrieves a single key, returns true and stores nodes in local
// database if successful
func (t *LightTrie) retrieveKey(ctx context.Context, key []byte) bool {
r := &TrieRequest{Id: t.id, Key: key}
r := &TrieRequest{Id: t.id, Key: crypto.Keccak256(key)}
return t.odr.Retrieve(ctx, r) == nil
}
// do tries and retries to execute a function until it returns with no error or
// an error type other than MissingNodeError
func (t *LightTrie) do(ctx context.Context, fallbackKey []byte, fn func() error) error {
func (t *LightTrie) do(ctx context.Context, key []byte, fn func() error) error {
err := fn()
for err != nil {
mn, ok := err.(*trie.MissingNodeError)
if !ok {
if _, ok := err.(*trie.MissingNodeError); !ok {
return err
}
var key []byte
if mn.PrefixLen+mn.SuffixLen > 0 {
key = mn.Key
} else {
key = fallbackKey
}
if !t.retrieveKey(ctx, key) {
break
}