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Merge pull request #311 from ethereum-optimism/axel/1_13_15_merge
merge upstream v1.13.15
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2024 The go-ethereum Authors | ||
| // This file is part of the go-ethereum library. | ||
| // | ||
| // The go-ethereum library is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Lesser General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // The go-ethereum library is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Lesser General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Lesser General Public License | ||
| // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| package snap | ||
|
|
||
| import ( | ||
| "bytes" | ||
|
|
||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/core/rawdb" | ||
| "github.com/ethereum/go-ethereum/ethdb" | ||
| "github.com/ethereum/go-ethereum/trie" | ||
| ) | ||
|
|
||
| // genTrie interface is used by the snap syncer to generate merkle tree nodes | ||
| // based on a received batch of states. | ||
| type genTrie interface { | ||
| // update inserts the state item into generator trie. | ||
| update(key, value []byte) error | ||
|
|
||
| // commit flushes the right boundary nodes if complete flag is true. This | ||
| // function must be called before flushing the associated database batch. | ||
| commit(complete bool) common.Hash | ||
| } | ||
|
|
||
| // pathTrie is a wrapper over the stackTrie, incorporating numerous additional | ||
| // logics to handle the semi-completed trie and potential leftover dangling | ||
| // nodes in the database. It is utilized for constructing the merkle tree nodes | ||
| // in path mode during the snap sync process. | ||
| type pathTrie struct { | ||
| owner common.Hash // identifier of trie owner, empty for account trie | ||
| tr *trie.StackTrie // underlying raw stack trie | ||
| first []byte // the path of first committed node by stackTrie | ||
| last []byte // the path of last committed node by stackTrie | ||
|
|
||
| // This flag indicates whether nodes on the left boundary are skipped for | ||
| // committing. If set, the left boundary nodes are considered incomplete | ||
| // due to potentially missing left children. | ||
| skipLeftBoundary bool | ||
| db ethdb.KeyValueReader | ||
| batch ethdb.Batch | ||
| } | ||
|
|
||
| // newPathTrie initializes the path trie. | ||
| func newPathTrie(owner common.Hash, skipLeftBoundary bool, db ethdb.KeyValueReader, batch ethdb.Batch) *pathTrie { | ||
| tr := &pathTrie{ | ||
| owner: owner, | ||
| skipLeftBoundary: skipLeftBoundary, | ||
| db: db, | ||
| batch: batch, | ||
| } | ||
| tr.tr = trie.NewStackTrie(tr.onTrieNode) | ||
| return tr | ||
| } | ||
|
|
||
| // onTrieNode is invoked whenever a new node is committed by the stackTrie. | ||
| // | ||
| // As the committed nodes might be incomplete if they are on the boundaries | ||
| // (left or right), this function has the ability to detect the incomplete | ||
| // ones and filter them out for committing. | ||
| // | ||
| // Additionally, the assumption is made that there may exist leftover dangling | ||
| // nodes in the database. This function has the ability to detect the dangling | ||
| // nodes that fall within the path space of committed nodes (specifically on | ||
| // the path covered by internal extension nodes) and remove them from the | ||
| // database. This property ensures that the entire path space is uniquely | ||
| // occupied by committed nodes. | ||
| // | ||
| // Furthermore, all leftover dangling nodes along the path from committed nodes | ||
| // to the trie root (left and right boundaries) should be removed as well; | ||
| // otherwise, they might potentially disrupt the state healing process. | ||
| func (t *pathTrie) onTrieNode(path []byte, hash common.Hash, blob []byte) { | ||
| // Filter out the nodes on the left boundary if skipLeftBoundary is | ||
| // configured. Nodes are considered to be on the left boundary if | ||
| // it's the first one to be committed, or the parent/ancestor of the | ||
| // first committed node. | ||
| if t.skipLeftBoundary && (t.first == nil || bytes.HasPrefix(t.first, path)) { | ||
| if t.first == nil { | ||
| // Memorize the path of first committed node, which is regarded | ||
| // as left boundary. Deep-copy is necessary as the path given | ||
| // is volatile. | ||
| t.first = append([]byte{}, path...) | ||
|
|
||
| // The left boundary can be uniquely determined by the first committed node | ||
| // from stackTrie (e.g., N_1), as the shared path prefix between the first | ||
| // two inserted state items is deterministic (the path of N_3). The path | ||
| // from trie root towards the first committed node is considered the left | ||
| // boundary. The potential leftover dangling nodes on left boundary should | ||
| // be cleaned out. | ||
| // | ||
| // +-----+ | ||
| // | N_3 | shared path prefix of state_1 and state_2 | ||
| // +-----+ | ||
| // /- -\ | ||
| // +-----+ +-----+ | ||
| // First committed node | N_1 | | N_2 | latest inserted node (contain state_2) | ||
| // +-----+ +-----+ | ||
| // | ||
| // The node with the path of the first committed one (e.g, N_1) is not | ||
| // removed because it's a sibling of the nodes we want to commit, not | ||
| // the parent or ancestor. | ||
| for i := 0; i < len(path); i++ { | ||
| t.delete(path[:i], false) | ||
| } | ||
| } | ||
| return | ||
| } | ||
| // If boundary filtering is not configured, or the node is not on the left | ||
| // boundary, commit it to database. | ||
| // | ||
| // Note: If the current committed node is an extension node, then the nodes | ||
| // falling within the path between itself and its standalone (not embedded | ||
| // in parent) child should be cleaned out for exclusively occupy the inner | ||
| // path. | ||
| // | ||
| // This is essential in snap sync to avoid leaving dangling nodes within | ||
| // this range covered by extension node which could potentially break the | ||
| // state healing. | ||
| // | ||
| // The extension node is detected if its path is the prefix of last committed | ||
| // one and path gap is larger than one. If the path gap is only one byte, | ||
| // the current node could either be a full node, or a extension with single | ||
| // byte key. In either case, no gaps will be left in the path. | ||
| if t.last != nil && bytes.HasPrefix(t.last, path) && len(t.last)-len(path) > 1 { | ||
| for i := len(path) + 1; i < len(t.last); i++ { | ||
| t.delete(t.last[:i], true) | ||
| } | ||
| } | ||
| t.write(path, blob) | ||
|
|
||
| // Update the last flag. Deep-copy is necessary as the provided path is volatile. | ||
| if t.last == nil { | ||
| t.last = append([]byte{}, path...) | ||
| } else { | ||
| t.last = append(t.last[:0], path...) | ||
| } | ||
| } | ||
|
|
||
| // write commits the node write to provided database batch in path mode. | ||
| func (t *pathTrie) write(path []byte, blob []byte) { | ||
| if t.owner == (common.Hash{}) { | ||
| rawdb.WriteAccountTrieNode(t.batch, path, blob) | ||
| } else { | ||
| rawdb.WriteStorageTrieNode(t.batch, t.owner, path, blob) | ||
| } | ||
| } | ||
|
|
||
| func (t *pathTrie) deleteAccountNode(path []byte, inner bool) { | ||
| if inner { | ||
| accountInnerLookupGauge.Inc(1) | ||
| } else { | ||
| accountOuterLookupGauge.Inc(1) | ||
| } | ||
| if !rawdb.ExistsAccountTrieNode(t.db, path) { | ||
| return | ||
| } | ||
| if inner { | ||
| accountInnerDeleteGauge.Inc(1) | ||
| } else { | ||
| accountOuterDeleteGauge.Inc(1) | ||
| } | ||
| rawdb.DeleteAccountTrieNode(t.batch, path) | ||
| } | ||
|
|
||
| func (t *pathTrie) deleteStorageNode(path []byte, inner bool) { | ||
| if inner { | ||
| storageInnerLookupGauge.Inc(1) | ||
| } else { | ||
| storageOuterLookupGauge.Inc(1) | ||
| } | ||
| if !rawdb.ExistsStorageTrieNode(t.db, t.owner, path) { | ||
| return | ||
| } | ||
| if inner { | ||
| storageInnerDeleteGauge.Inc(1) | ||
| } else { | ||
| storageOuterDeleteGauge.Inc(1) | ||
| } | ||
| rawdb.DeleteStorageTrieNode(t.batch, t.owner, path) | ||
| } | ||
|
|
||
| // delete commits the node deletion to provided database batch in path mode. | ||
| func (t *pathTrie) delete(path []byte, inner bool) { | ||
| if t.owner == (common.Hash{}) { | ||
| t.deleteAccountNode(path, inner) | ||
| } else { | ||
| t.deleteStorageNode(path, inner) | ||
| } | ||
| } | ||
|
|
||
| // update implements genTrie interface, inserting a (key, value) pair into the | ||
| // stack trie. | ||
| func (t *pathTrie) update(key, value []byte) error { | ||
| return t.tr.Update(key, value) | ||
| } | ||
|
|
||
| // commit implements genTrie interface, flushing the right boundary if it's | ||
| // considered as complete. Otherwise, the nodes on the right boundary are | ||
| // discarded and cleaned up. | ||
| // | ||
| // Note, this function must be called before flushing database batch, otherwise, | ||
| // dangling nodes might be left in database. | ||
| func (t *pathTrie) commit(complete bool) common.Hash { | ||
| // If the right boundary is claimed as complete, flush them out. | ||
| // The nodes on both left and right boundary will still be filtered | ||
| // out if left boundary filtering is configured. | ||
| if complete { | ||
| // Commit all inserted but not yet committed nodes(on the right | ||
| // boundary) in the stackTrie. | ||
| hash := t.tr.Hash() | ||
| if t.skipLeftBoundary { | ||
| return common.Hash{} // hash is meaningless if left side is incomplete | ||
| } | ||
| return hash | ||
| } | ||
| // Discard nodes on the right boundary as it's claimed as incomplete. These | ||
| // nodes might be incomplete due to missing children on the right side. | ||
| // Furthermore, the potential leftover nodes on right boundary should also | ||
| // be cleaned out. | ||
| // | ||
| // The right boundary can be uniquely determined by the last committed node | ||
| // from stackTrie (e.g., N_1), as the shared path prefix between the last | ||
| // two inserted state items is deterministic (the path of N_3). The path | ||
| // from trie root towards the last committed node is considered the right | ||
| // boundary (root to N_3). | ||
| // | ||
| // +-----+ | ||
| // | N_3 | shared path prefix of last two states | ||
| // +-----+ | ||
| // /- -\ | ||
| // +-----+ +-----+ | ||
| // Last committed node | N_1 | | N_2 | latest inserted node (contain last state) | ||
| // +-----+ +-----+ | ||
| // | ||
| // Another interesting scenario occurs when the trie is committed due to | ||
| // too many items being accumulated in the batch. To flush them out to | ||
| // the database, the path of the last inserted node (N_2) is temporarily | ||
| // treated as an incomplete right boundary, and nodes on this path are | ||
| // removed (e.g. from root to N_3). | ||
| // However, this path will be reclaimed as an internal path by inserting | ||
| // more items after the batch flush. New nodes on this path can be committed | ||
| // with no issues as they are actually complete. Also, from a database | ||
| // perspective, first deleting and then rewriting is a valid data update. | ||
| for i := 0; i < len(t.last); i++ { | ||
| t.delete(t.last[:i], false) | ||
| } | ||
| return common.Hash{} // the hash is meaningless for incomplete commit | ||
| } | ||
|
|
||
| // hashTrie is a wrapper over the stackTrie for implementing genTrie interface. | ||
| type hashTrie struct { | ||
| tr *trie.StackTrie | ||
| } | ||
|
|
||
| // newHashTrie initializes the hash trie. | ||
| func newHashTrie(batch ethdb.Batch) *hashTrie { | ||
| return &hashTrie{tr: trie.NewStackTrie(func(path []byte, hash common.Hash, blob []byte) { | ||
| rawdb.WriteLegacyTrieNode(batch, hash, blob) | ||
| })} | ||
| } | ||
|
|
||
| // update implements genTrie interface, inserting a (key, value) pair into | ||
| // the stack trie. | ||
| func (t *hashTrie) update(key, value []byte) error { | ||
| return t.tr.Update(key, value) | ||
| } | ||
|
|
||
| // commit implements genTrie interface, committing the nodes on right boundary. | ||
| func (t *hashTrie) commit(complete bool) common.Hash { | ||
| if !complete { | ||
| return common.Hash{} // the hash is meaningless for incomplete commit | ||
| } | ||
| return t.tr.Hash() // return hash only if it's claimed as complete | ||
| } |
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