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core, eth, trie: prepare trie sync for path based operation

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pull/21504/head
Péter Szilágyi 4 years ago
parent 5883afb3ef
commit eeaf191633
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GPG Key ID: E9AE538CEDF8293D
6 changed files with 480 additions and 105 deletions
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  1. 127
      core/state/sync_test.go
  2. 119
      eth/downloader/statesync.go
  3. 6
      trie/secure_trie.go
  4. 66
      trie/sync.go
  5. 149
      trie/sync_test.go
  6. 84
      trie/trie.go

127
core/state/sync_test.go
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@ -26,6 +26,7 @@ import (
"github.com/ethereum/go-ethereum/crypto" "github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb" "github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/ethdb/memorydb" "github.com/ethereum/go-ethereum/ethdb/memorydb"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie" "github.com/ethereum/go-ethereum/trie"
) )
@ -44,7 +45,7 @@ func makeTestState() (Database, common.Hash, []*testAccount) {
state, _ := New(common.Hash{}, db, nil) state, _ := New(common.Hash{}, db, nil)
// Fill it with some arbitrary data // Fill it with some arbitrary data
accounts := []*testAccount{} var accounts []*testAccount
for i := byte(0); i < 96; i++ { for i := byte(0); i < 96; i++ {
obj := state.GetOrNewStateObject(common.BytesToAddress([]byte{i})) obj := state.GetOrNewStateObject(common.BytesToAddress([]byte{i}))
acc := &testAccount{address: common.BytesToAddress([]byte{i})} acc := &testAccount{address: common.BytesToAddress([]byte{i})}
@ -59,6 +60,11 @@ func makeTestState() (Database, common.Hash, []*testAccount) {
obj.SetCode(crypto.Keccak256Hash([]byte{i, i, i, i, i}), []byte{i, i, i, i, i}) obj.SetCode(crypto.Keccak256Hash([]byte{i, i, i, i, i}), []byte{i, i, i, i, i})
acc.code = []byte{i, i, i, i, i} acc.code = []byte{i, i, i, i, i}
} }
if i%5 == 0 {
for j := byte(0); j < 5; j++ {
obj.SetState(db, crypto.Keccak256Hash([]byte{i, i, i, i, i, j, j}), crypto.Keccak256Hash([]byte{i, i, i, i, i, j, j}))
}
}
state.updateStateObject(obj) state.updateStateObject(obj)
accounts = append(accounts, acc) accounts = append(accounts, acc)
} }
@ -126,44 +132,94 @@ func checkStateConsistency(db ethdb.Database, root common.Hash) error {
// Tests that an empty state is not scheduled for syncing. // Tests that an empty state is not scheduled for syncing.
func TestEmptyStateSync(t *testing.T) { func TestEmptyStateSync(t *testing.T) {
empty := common.HexToHash("56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421") empty := common.HexToHash("56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421")
if req := NewStateSync(empty, rawdb.NewMemoryDatabase(), trie.NewSyncBloom(1, memorydb.New())).Missing(1); len(req) != 0 { sync := NewStateSync(empty, rawdb.NewMemoryDatabase(), trie.NewSyncBloom(1, memorydb.New()))
t.Errorf("content requested for empty state: %v", req) if nodes, paths, codes := sync.Missing(1); len(nodes) != 0 || len(paths) != 0 || len(codes) != 0 {
t.Errorf(" content requested for empty state: %v, %v, %v", nodes, paths, codes)
} }
} }
// Tests that given a root hash, a state can sync iteratively on a single thread, // Tests that given a root hash, a state can sync iteratively on a single thread,
// requesting retrieval tasks and returning all of them in one go. // requesting retrieval tasks and returning all of them in one go.
func TestIterativeStateSyncIndividual(t *testing.T) { testIterativeStateSync(t, 1, false) } func TestIterativeStateSyncIndividual(t *testing.T) {
func TestIterativeStateSyncBatched(t *testing.T) { testIterativeStateSync(t, 100, false) } testIterativeStateSync(t, 1, false, false)
func TestIterativeStateSyncIndividualFromDisk(t *testing.T) { testIterativeStateSync(t, 1, true) } }
func TestIterativeStateSyncBatchedFromDisk(t *testing.T) { testIterativeStateSync(t, 100, true) } func TestIterativeStateSyncBatched(t *testing.T) {
testIterativeStateSync(t, 100, false, false)
}
func TestIterativeStateSyncIndividualFromDisk(t *testing.T) {
testIterativeStateSync(t, 1, true, false)
}
func TestIterativeStateSyncBatchedFromDisk(t *testing.T) {
testIterativeStateSync(t, 100, true, false)
}
func TestIterativeStateSyncIndividualByPath(t *testing.T) {
testIterativeStateSync(t, 1, false, true)
}
func TestIterativeStateSyncBatchedByPath(t *testing.T) {
testIterativeStateSync(t, 100, false, true)
}
func testIterativeStateSync(t *testing.T, count int, commit bool) { func testIterativeStateSync(t *testing.T, count int, commit bool, bypath bool) {
// Create a random state to copy // Create a random state to copy
srcDb, srcRoot, srcAccounts := makeTestState() srcDb, srcRoot, srcAccounts := makeTestState()
if commit { if commit {
srcDb.TrieDB().Commit(srcRoot, false, nil) srcDb.TrieDB().Commit(srcRoot, false, nil)
} }
srcTrie, _ := trie.New(srcRoot, srcDb.TrieDB())
// Create a destination state and sync with the scheduler // Create a destination state and sync with the scheduler
dstDb := rawdb.NewMemoryDatabase() dstDb := rawdb.NewMemoryDatabase()
sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb)) sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb))
queue := append([]common.Hash{}, sched.Missing(count)...) nodes, paths, codes := sched.Missing(count)
for len(queue) > 0 { var (
results := make([]trie.SyncResult, len(queue)) hashQueue []common.Hash
for i, hash := range queue { pathQueue []trie.SyncPath
)
if !bypath {
hashQueue = append(append(hashQueue[:0], nodes...), codes...)
} else {
hashQueue = append(hashQueue[:0], codes...)
pathQueue = append(pathQueue[:0], paths...)
}
for len(hashQueue)+len(pathQueue) > 0 {
results := make([]trie.SyncResult, len(hashQueue)+len(pathQueue))
for i, hash := range hashQueue {
data, err := srcDb.TrieDB().Node(hash) data, err := srcDb.TrieDB().Node(hash)
if err != nil { if err != nil {
data, err = srcDb.ContractCode(common.Hash{}, hash) data, err = srcDb.ContractCode(common.Hash{}, hash)
} }
if err != nil { if err != nil {
t.Fatalf("failed to retrieve node data for %x", hash) t.Fatalf("failed to retrieve node data for hash %x", hash)
} }
results[i] = trie.SyncResult{Hash: hash, Data: data} results[i] = trie.SyncResult{Hash: hash, Data: data}
} }
for i, path := range pathQueue {
if len(path) == 1 {
data, _, err := srcTrie.TryGetNode(path[0])
if err != nil {
t.Fatalf("failed to retrieve node data for path %x: %v", path, err)
}
results[len(hashQueue)+i] = trie.SyncResult{Hash: crypto.Keccak256Hash(data), Data: data}
} else {
var acc Account
if err := rlp.DecodeBytes(srcTrie.Get(path[0]), &acc); err != nil {
t.Fatalf("failed to decode account on path %x: %v", path, err)
}
stTrie, err := trie.New(acc.Root, srcDb.TrieDB())
if err != nil {
t.Fatalf("failed to retriev storage trie for path %x: %v", path, err)
}
data, _, err := stTrie.TryGetNode(path[1])
if err != nil {
t.Fatalf("failed to retrieve node data for path %x: %v", path, err)
}
results[len(hashQueue)+i] = trie.SyncResult{Hash: crypto.Keccak256Hash(data), Data: data}
}
}
for _, result := range results { for _, result := range results {
if err := sched.Process(result); err != nil { if err := sched.Process(result); err != nil {
t.Fatalf("failed to process result %v", err) t.Errorf("failed to process result %v", err)
} }
} }
batch := dstDb.NewBatch() batch := dstDb.NewBatch()
@ -171,7 +227,14 @@ func testIterativeStateSync(t *testing.T, count int, commit bool) {
t.Fatalf("failed to commit data: %v", err) t.Fatalf("failed to commit data: %v", err)
} }
batch.Write() batch.Write()
queue = append(queue[:0], sched.Missing(count)...)
nodes, paths, codes = sched.Missing(count)
if !bypath {
hashQueue = append(append(hashQueue[:0], nodes...), codes...)
} else {
hashQueue = append(hashQueue[:0], codes...)
pathQueue = append(pathQueue[:0], paths...)
}
} }
// Cross check that the two states are in sync // Cross check that the two states are in sync
checkStateAccounts(t, dstDb, srcRoot, srcAccounts) checkStateAccounts(t, dstDb, srcRoot, srcAccounts)
@ -187,7 +250,9 @@ func TestIterativeDelayedStateSync(t *testing.T) {
dstDb := rawdb.NewMemoryDatabase() dstDb := rawdb.NewMemoryDatabase()
sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb)) sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb))
queue := append([]common.Hash{}, sched.Missing(0)...) nodes, _, codes := sched.Missing(0)
queue := append(append([]common.Hash{}, nodes...), codes...)
for len(queue) > 0 { for len(queue) > 0 {
// Sync only half of the scheduled nodes // Sync only half of the scheduled nodes
results := make([]trie.SyncResult, len(queue)/2+1) results := make([]trie.SyncResult, len(queue)/2+1)
@ -211,7 +276,9 @@ func TestIterativeDelayedStateSync(t *testing.T) {
t.Fatalf("failed to commit data: %v", err) t.Fatalf("failed to commit data: %v", err)
} }
batch.Write() batch.Write()
queue = append(queue[len(results):], sched.Missing(0)...)
nodes, _, codes = sched.Missing(0)
queue = append(append(queue[len(results):], nodes...), codes...)
} }
// Cross check that the two states are in sync // Cross check that the two states are in sync
checkStateAccounts(t, dstDb, srcRoot, srcAccounts) checkStateAccounts(t, dstDb, srcRoot, srcAccounts)
@ -232,7 +299,8 @@ func testIterativeRandomStateSync(t *testing.T, count int) {
sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb)) sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb))
queue := make(map[common.Hash]struct{}) queue := make(map[common.Hash]struct{})
for _, hash := range sched.Missing(count) { nodes, _, codes := sched.Missing(count)
for _, hash := range append(nodes, codes...) {
queue[hash] = struct{}{} queue[hash] = struct{}{}
} }
for len(queue) > 0 { for len(queue) > 0 {
@ -259,8 +327,10 @@ func testIterativeRandomStateSync(t *testing.T, count int) {
t.Fatalf("failed to commit data: %v", err) t.Fatalf("failed to commit data: %v", err)
} }
batch.Write() batch.Write()
queue = make(map[common.Hash]struct{}) queue = make(map[common.Hash]struct{})
for _, hash := range sched.Missing(count) { nodes, _, codes = sched.Missing(count)
for _, hash := range append(nodes, codes...) {
queue[hash] = struct{}{} queue[hash] = struct{}{}
} }
} }
@ -279,7 +349,8 @@ func TestIterativeRandomDelayedStateSync(t *testing.T) {
sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb)) sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb))
queue := make(map[common.Hash]struct{}) queue := make(map[common.Hash]struct{})
for _, hash := range sched.Missing(0) { nodes, _, codes := sched.Missing(0)
for _, hash := range append(nodes, codes...) {
queue[hash] = struct{}{} queue[hash] = struct{}{}
} }
for len(queue) > 0 { for len(queue) > 0 {
@ -312,7 +383,11 @@ func TestIterativeRandomDelayedStateSync(t *testing.T) {
t.Fatalf("failed to commit data: %v", err) t.Fatalf("failed to commit data: %v", err)
} }
batch.Write() batch.Write()
for _, hash := range sched.Missing(0) { for _, result := range results {
delete(queue, result.Hash)
}
nodes, _, codes = sched.Missing(0)
for _, hash := range append(nodes, codes...) {
queue[hash] = struct{}{} queue[hash] = struct{}{}
} }
} }
@ -341,8 +416,11 @@ func TestIncompleteStateSync(t *testing.T) {
dstDb := rawdb.NewMemoryDatabase() dstDb := rawdb.NewMemoryDatabase()
sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb)) sched := NewStateSync(srcRoot, dstDb, trie.NewSyncBloom(1, dstDb))
added := []common.Hash{} var added []common.Hash
queue := append([]common.Hash{}, sched.Missing(1)...)
nodes, _, codes := sched.Missing(1)
queue := append(append([]common.Hash{}, nodes...), codes...)
for len(queue) > 0 { for len(queue) > 0 {
// Fetch a batch of state nodes // Fetch a batch of state nodes
results := make([]trie.SyncResult, len(queue)) results := make([]trie.SyncResult, len(queue))
@ -382,7 +460,8 @@ func TestIncompleteStateSync(t *testing.T) {
} }
} }
// Fetch the next batch to retrieve // Fetch the next batch to retrieve
queue = append(queue[:0], sched.Missing(1)...) nodes, _, codes = sched.Missing(1)
queue = append(append(queue[:0], nodes...), codes...)
} }
// Sanity check that removing any node from the database is detected // Sanity check that removing any node from the database is detected
for _, node := range added[1:] { for _, node := range added[1:] {

119
eth/downloader/statesync.go
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@ -35,7 +35,8 @@ import (
// a single data retrieval network packet. // a single data retrieval network packet.
type stateReq struct { type stateReq struct {
nItems uint16 // Number of items requested for download (max is 384, so uint16 is sufficient) nItems uint16 // Number of items requested for download (max is 384, so uint16 is sufficient)
tasks map[common.Hash]*stateTask // Download tasks to track previous attempts trieTasks map[common.Hash]*trieTask // Trie node download tasks to track previous attempts
codeTasks map[common.Hash]*codeTask // Byte code download tasks to track previous attempts
timeout time.Duration // Maximum round trip time for this to complete timeout time.Duration // Maximum round trip time for this to complete
timer *time.Timer // Timer to fire when the RTT timeout expires timer *time.Timer // Timer to fire when the RTT timeout expires
peer *peerConnection // Peer that we're requesting from peer *peerConnection // Peer that we're requesting from
@ -253,7 +254,9 @@ type stateSync struct {
sched *trie.Sync // State trie sync scheduler defining the tasks sched *trie.Sync // State trie sync scheduler defining the tasks
keccak hash.Hash // Keccak256 hasher to verify deliveries with keccak hash.Hash // Keccak256 hasher to verify deliveries with
tasks map[common.Hash]*stateTask // Set of tasks currently queued for retrieval
trieTasks map[common.Hash]*trieTask // Set of trie node tasks currently queued for retrieval
codeTasks map[common.Hash]*codeTask // Set of byte code tasks currently queued for retrieval
numUncommitted int numUncommitted int
bytesUncommitted int bytesUncommitted int
@ -269,9 +272,16 @@ type stateSync struct {
root common.Hash root common.Hash
} }
// stateTask represents a single trie node download task, containing a set of // trieTask represents a single trie node download task, containing a set of
// peers already attempted retrieval from to detect stalled syncs and abort.
type trieTask struct {
path [][]byte
attempts map[string]struct{}
}
// codeTask represents a single byte code download task, containing a set of
// peers already attempted retrieval from to detect stalled syncs and abort. // peers already attempted retrieval from to detect stalled syncs and abort.
type stateTask struct { type codeTask struct {
attempts map[string]struct{} attempts map[string]struct{}
} }
@ -282,7 +292,8 @@ func newStateSync(d *Downloader, root common.Hash) *stateSync {
d: d, d: d,
sched: state.NewStateSync(root, d.stateDB, d.stateBloom), sched: state.NewStateSync(root, d.stateDB, d.stateBloom),
keccak: sha3.NewLegacyKeccak256(), keccak: sha3.NewLegacyKeccak256(),
tasks: make(map[common.Hash]*stateTask), trieTasks: make(map[common.Hash]*trieTask),
codeTasks: make(map[common.Hash]*codeTask),
deliver: make(chan *stateReq), deliver: make(chan *stateReq),
cancel: make(chan struct{}), cancel: make(chan struct{}),
done: make(chan struct{}), done: make(chan struct{}),
@ -411,14 +422,15 @@ func (s *stateSync) assignTasks() {
// Assign a batch of fetches proportional to the estimated latency/bandwidth // Assign a batch of fetches proportional to the estimated latency/bandwidth
cap := p.NodeDataCapacity(s.d.requestRTT()) cap := p.NodeDataCapacity(s.d.requestRTT())
req := &stateReq{peer: p, timeout: s.d.requestTTL()} req := &stateReq{peer: p, timeout: s.d.requestTTL()}
items := s.fillTasks(cap, req)
nodes, _, codes := s.fillTasks(cap, req)
// If the peer was assigned tasks to fetch, send the network request // If the peer was assigned tasks to fetch, send the network request
if len(items) > 0 { if len(nodes)+len(codes) > 0 {
req.peer.log.Trace("Requesting new batch of data", "type", "state", "count", len(items), "root", s.root) req.peer.log.Trace("Requesting batch of state data", "nodes", len(nodes), "codes", len(codes), "root", s.root)
select { select {
case s.d.trackStateReq <- req: case s.d.trackStateReq <- req:
req.peer.FetchNodeData(items) req.peer.FetchNodeData(append(nodes, codes...)) // Unified retrieval under eth/6x
case <-s.cancel: case <-s.cancel:
case <-s.d.cancelCh: case <-s.d.cancelCh:
} }
@ -428,20 +440,34 @@ func (s *stateSync) assignTasks() {
// fillTasks fills the given request object with a maximum of n state download // fillTasks fills the given request object with a maximum of n state download
// tasks to send to the remote peer. // tasks to send to the remote peer.
func (s *stateSync) fillTasks(n int, req *stateReq) []common.Hash { func (s *stateSync) fillTasks(n int, req *stateReq) (nodes []common.Hash, paths []trie.SyncPath, codes []common.Hash) {
// Refill available tasks from the scheduler. // Refill available tasks from the scheduler.
if len(s.tasks) < n { if fill := n - (len(s.trieTasks) + len(s.codeTasks)); fill > 0 {
new := s.sched.Missing(n - len(s.tasks)) nodes, paths, codes := s.sched.Missing(fill)
for _, hash := range new { for i, hash := range nodes {
s.tasks[hash] = &stateTask{make(map[string]struct{})} s.trieTasks[hash] = &trieTask{
path: paths[i],
attempts: make(map[string]struct{}),
}
}
for _, hash := range codes {
s.codeTasks[hash] = &codeTask{
attempts: make(map[string]struct{}),
}
} }
} }
// Find tasks that haven't been tried with the request's peer. // Find tasks that haven't been tried with the request's peer. Prefer code
items := make([]common.Hash, 0, n) // over trie nodes as those can be written to disk and forgotten about.
req.tasks = make(map[common.Hash]*stateTask, n) nodes = make([]common.Hash, 0, n)
for hash, t := range s.tasks { paths = make([]trie.SyncPath, 0, n)
codes = make([]common.Hash, 0, n)
req.trieTasks = make(map[common.Hash]*trieTask, n)
req.codeTasks = make(map[common.Hash]*codeTask, n)
for hash, t := range s.codeTasks {
// Stop when we've gathered enough requests // Stop when we've gathered enough requests
if len(items) == n { if len(nodes)+len(codes) == n {
break break
} }
// Skip any requests we've already tried from this peer // Skip any requests we've already tried from this peer
@ -450,12 +476,30 @@ func (s *stateSync) fillTasks(n int, req *stateReq) []common.Hash {
} }
// Assign the request to this peer // Assign the request to this peer
t.attempts[req.peer.id] = struct{}{} t.attempts[req.peer.id] = struct{}{}
items = append(items, hash) codes = append(codes, hash)
req.tasks[hash] = t req.codeTasks[hash] = t
delete(s.tasks, hash) delete(s.codeTasks, hash)
}
for hash, t := range s.trieTasks {
// Stop when we've gathered enough requests
if len(nodes)+len(codes) == n {
break
}
// Skip any requests we've already tried from this peer
if _, ok := t.attempts[req.peer.id]; ok {
continue
} }
req.nItems = uint16(len(items)) // Assign the request to this peer
return items t.attempts[req.peer.id] = struct{}{}
nodes = append(nodes, hash)
paths = append(paths, t.path)
req.trieTasks[hash] = t
delete(s.trieTasks, hash)
}
req.nItems = uint16(len(nodes) + len(codes))
return nodes, paths, codes
} }
// process iterates over a batch of delivered state data, injecting each item // process iterates over a batch of delivered state data, injecting each item
@ -487,11 +531,28 @@ func (s *stateSync) process(req *stateReq) (int, error) {
default: default:
return successful, fmt.Errorf("invalid state node %s: %v", hash.TerminalString(), err) return successful, fmt.Errorf("invalid state node %s: %v", hash.TerminalString(), err)
} }
delete(req.tasks, hash) // Delete from both queues (one delivery is enough for the syncer)
delete(req.trieTasks, hash)
delete(req.codeTasks, hash)
} }
// Put unfulfilled tasks back into the retry queue // Put unfulfilled tasks back into the retry queue
npeers := s.d.peers.Len() npeers := s.d.peers.Len()
for hash, task := range req.tasks { for hash, task := range req.trieTasks {
// If the node did deliver something, missing items may be due to a protocol
// limit or a previous timeout + delayed delivery. Both cases should permit
// the node to retry the missing items (to avoid single-peer stalls).
if len(req.response) > 0 || req.timedOut() {
delete(task.attempts, req.peer.id)
}
// If we've requested the node too many times already, it may be a malicious
// sync where nobody has the right data. Abort.
if len(task.attempts) >= npeers {
return successful, fmt.Errorf("trie node %s failed with all peers (%d tries, %d peers)", hash.TerminalString(), len(task.attempts), npeers)
}
// Missing item, place into the retry queue.
s.trieTasks[hash] = task
}
for hash, task := range req.codeTasks {
// If the node did deliver something, missing items may be due to a protocol // If the node did deliver something, missing items may be due to a protocol
// limit or a previous timeout + delayed delivery. Both cases should permit // limit or a previous timeout + delayed delivery. Both cases should permit
// the node to retry the missing items (to avoid single-peer stalls). // the node to retry the missing items (to avoid single-peer stalls).
@ -501,10 +562,10 @@ func (s *stateSync) process(req *stateReq) (int, error) {
// If we've requested the node too many times already, it may be a malicious // If we've requested the node too many times already, it may be a malicious
// sync where nobody has the right data. Abort. // sync where nobody has the right data. Abort.
if len(task.attempts) >= npeers { if len(task.attempts) >= npeers {
return successful, fmt.Errorf("state node %s failed with all peers (%d tries, %d peers)", hash.TerminalString(), len(task.attempts), npeers) return successful, fmt.Errorf("byte code %s failed with all peers (%d tries, %d peers)", hash.TerminalString(), len(task.attempts), npeers)
} }
// Missing item, place into the retry queue. // Missing item, place into the retry queue.
s.tasks[hash] = task s.codeTasks[hash] = task
} }
return successful, nil return successful, nil
} }
@ -533,7 +594,7 @@ func (s *stateSync) updateStats(written, duplicate, unexpected int, duration tim
s.d.syncStatsState.unexpected += uint64(unexpected) s.d.syncStatsState.unexpected += uint64(unexpected)
if written > 0 || duplicate > 0 || unexpected > 0 { if written > 0 || duplicate > 0 || unexpected > 0 {
log.Info("Imported new state entries", "count", written, "elapsed", common.PrettyDuration(duration), "processed", s.d.syncStatsState.processed, "pending", s.d.syncStatsState.pending, "retry", len(s.tasks), "duplicate", s.d.syncStatsState.duplicate, "unexpected", s.d.syncStatsState.unexpected) log.Info("Imported new state entries", "count", written, "elapsed", common.PrettyDuration(duration), "processed", s.d.syncStatsState.processed, "pending", s.d.syncStatsState.pending, "trieretry", len(s.trieTasks), "coderetry", len(s.codeTasks), "duplicate", s.d.syncStatsState.duplicate, "unexpected", s.d.syncStatsState.unexpected)
} }
if written > 0 { if written > 0 {
rawdb.WriteFastTrieProgress(s.d.stateDB, s.d.syncStatsState.processed) rawdb.WriteFastTrieProgress(s.d.stateDB, s.d.syncStatsState.processed)

6
trie/secure_trie.go
Unescape View File

@ -79,6 +79,12 @@ func (t *SecureTrie) TryGet(key []byte) ([]byte, error) {
return t.trie.TryGet(t.hashKey(key)) return t.trie.TryGet(t.hashKey(key))
} }
// TryGetNode attempts to retrieve a trie node by compact-encoded path. It is not
// possible to use keybyte-encoding as the path might contain odd nibbles.
func (t *SecureTrie) TryGetNode(path []byte) ([]byte, int, error) {
return t.trie.TryGetNode(path)
}
// Update associates key with value in the trie. Subsequent calls to // Update associates key with value in the trie. Subsequent calls to
// Get will return value. If value has length zero, any existing value // Get will return value. If value has length zero, any existing value
// is deleted from the trie and calls to Get will return nil. // is deleted from the trie and calls to Get will return nil.

66
trie/sync.go
Unescape View File

@ -52,6 +52,39 @@ type request struct {
callback LeafCallback // Callback to invoke if a leaf node it reached on this branch callback LeafCallback // Callback to invoke if a leaf node it reached on this branch
} }
// SyncPath is a path tuple identifying a particular trie node either in a single
// trie (account) or a layered trie (account -> storage).
//
// Content wise the tuple either has 1 element if it addresses a node in a single
// trie or 2 elements if it addresses a node in a stacked trie.
//
// To support aiming arbitrary trie nodes, the path needs to support odd nibble
// lengths. To avoid transferring expanded hex form over the network, the last
// part of the tuple (which needs to index into the middle of a trie) is compact
// encoded. In case of a 2-tuple, the first item is always 32 bytes so that is
// simple binary encoded.
//
// Examples:
// - Path 0x9 -> {0x19}
// - Path 0x99 -> {0x0099}
// - Path 0x01234567890123456789012345678901012345678901234567890123456789019 -> {0x0123456789012345678901234567890101234567890123456789012345678901, 0x19}
// - Path 0x012345678901234567890123456789010123456789012345678901234567890199 -> {0x0123456789012345678901234567890101234567890123456789012345678901, 0x0099}
type SyncPath [][]byte
// newSyncPath converts an expanded trie path from nibble form into a compact
// version that can be sent over the network.
func newSyncPath(path []byte) SyncPath {
// If the hash is from the account trie, append a single item, if it
// is from the a storage trie, append a tuple. Note, the length 64 is
// clashing between account leaf and storage root. It's fine though
// because having a trie node at 64 depth means a hash collision was
// found and we're long dead.
if len(path) < 64 {
return SyncPath{hexToCompact(path)}
}
return SyncPath{hexToKeybytes(path[:64]), hexToCompact(path[64:])}
}
// SyncResult is a response with requested data along with it's hash. // SyncResult is a response with requested data along with it's hash.
type SyncResult struct { type SyncResult struct {
Hash common.Hash // Hash of the originally unknown trie node Hash common.Hash // Hash of the originally unknown trie node
@ -193,10 +226,16 @@ func (s *Sync) AddCodeEntry(hash common.Hash, path []byte, parent common.Hash) {
s.schedule(req) s.schedule(req)
} }
// Missing retrieves the known missing nodes from the trie for retrieval. // Missing retrieves the known missing nodes from the trie for retrieval. To aid
func (s *Sync) Missing(max int) []common.Hash { // both eth/6x style fast sync and snap/1x style state sync, the paths of trie
var requests []common.Hash // nodes are returned too, as well as separate hash list for codes.
for !s.queue.Empty() && (max == 0 || len(requests) < max) { func (s *Sync) Missing(max int) (nodes []common.Hash, paths []SyncPath, codes []common.Hash) {
var (
nodeHashes []common.Hash
nodePaths []SyncPath
codeHashes []common.Hash
)
for !s.queue.Empty() && (max == 0 || len(nodeHashes)+len(codeHashes) < max) {
// Retrieve th enext item in line // Retrieve th enext item in line
item, prio := s.queue.Peek() item, prio := s.queue.Peek()
@ -208,9 +247,16 @@ func (s *Sync) Missing(max int) []common.Hash {
// Item is allowed to be scheduled, add it to the task list // Item is allowed to be scheduled, add it to the task list
s.queue.Pop() s.queue.Pop()
s.fetches[depth]++ s.fetches[depth]++
requests = append(requests, item.(common.Hash))
hash := item.(common.Hash)
if req, ok := s.nodeReqs[hash]; ok {
nodeHashes = append(nodeHashes, hash)
nodePaths = append(nodePaths, newSyncPath(req.path))
} else {
codeHashes = append(codeHashes, hash)
} }
return requests }
return nodeHashes, nodePaths, codeHashes
} }
// Process injects the received data for requested item. Note it can // Process injects the received data for requested item. Note it can
@ -322,9 +368,13 @@ func (s *Sync) children(req *request, object node) ([]*request, error) {
switch node := (object).(type) { switch node := (object).(type) {
case *shortNode: case *shortNode:
key := node.Key
if hasTerm(key) {
key = key[:len(key)-1]
}
children = []child{{ children = []child{{
node: node.Val, node: node.Val,
path: append(append([]byte(nil), req.path...), node.Key...), path: append(append([]byte(nil), req.path...), key...),
}} }}
case *fullNode: case *fullNode:
for i := 0; i < 17; i++ { for i := 0; i < 17; i++ {
@ -344,7 +394,7 @@ func (s *Sync) children(req *request, object node) ([]*request, error) {
// Notify any external watcher of a new key/value node // Notify any external watcher of a new key/value node
if req.callback != nil { if req.callback != nil {
if node, ok := (child.node).(valueNode); ok { if node, ok := (child.node).(valueNode); ok {
if err := req.callback(req.path, node, req.hash); err != nil { if err := req.callback(child.path, node, req.hash); err != nil {
return nil, err return nil, err
} }
} }

149
trie/sync_test.go
Unescape View File

@ -21,14 +21,15 @@ import (
"testing" "testing"
"github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb/memorydb" "github.com/ethereum/go-ethereum/ethdb/memorydb"
) )
// makeTestTrie create a sample test trie to test node-wise reconstruction. // makeTestTrie create a sample test trie to test node-wise reconstruction.
func makeTestTrie() (*Database, *Trie, map[string][]byte) { func makeTestTrie() (*Database, *SecureTrie, map[string][]byte) {
// Create an empty trie // Create an empty trie
triedb := NewDatabase(memorydb.New()) triedb := NewDatabase(memorydb.New())
trie, _ := New(common.Hash{}, triedb) trie, _ := NewSecure(common.Hash{}, triedb)
// Fill it with some arbitrary data // Fill it with some arbitrary data
content := make(map[string][]byte) content := make(map[string][]byte)
@ -59,7 +60,7 @@ func makeTestTrie() (*Database, *Trie, map[string][]byte) {
// content map. // content map.
func checkTrieContents(t *testing.T, db *Database, root []byte, content map[string][]byte) { func checkTrieContents(t *testing.T, db *Database, root []byte, content map[string][]byte) {
// Check root availability and trie contents // Check root availability and trie contents
trie, err := New(common.BytesToHash(root), db) trie, err := NewSecure(common.BytesToHash(root), db)
if err != nil { if err != nil {
t.Fatalf("failed to create trie at %x: %v", root, err) t.Fatalf("failed to create trie at %x: %v", root, err)
} }
@ -76,7 +77,7 @@ func checkTrieContents(t *testing.T, db *Database, root []byte, content map[stri
// checkTrieConsistency checks that all nodes in a trie are indeed present. // checkTrieConsistency checks that all nodes in a trie are indeed present.
func checkTrieConsistency(db *Database, root common.Hash) error { func checkTrieConsistency(db *Database, root common.Hash) error {
// Create and iterate a trie rooted in a subnode // Create and iterate a trie rooted in a subnode
trie, err := New(root, db) trie, err := NewSecure(root, db)
if err != nil { if err != nil {
return nil // Consider a non existent state consistent return nil // Consider a non existent state consistent
} }
@ -94,18 +95,21 @@ func TestEmptySync(t *testing.T) {
emptyB, _ := New(emptyRoot, dbB) emptyB, _ := New(emptyRoot, dbB)
for i, trie := range []*Trie{emptyA, emptyB} { for i, trie := range []*Trie{emptyA, emptyB} {
if req := NewSync(trie.Hash(), memorydb.New(), nil, NewSyncBloom(1, memorydb.New())).Missing(1); len(req) != 0 { sync := NewSync(trie.Hash(), memorydb.New(), nil, NewSyncBloom(1, memorydb.New()))
t.Errorf("test %d: content requested for empty trie: %v", i, req) if nodes, paths, codes := sync.Missing(1); len(nodes) != 0 || len(paths) != 0 || len(codes) != 0 {
t.Errorf("test %d: content requested for empty trie: %v, %v, %v", i, nodes, paths, codes)
} }
} }
} }
// Tests that given a root hash, a trie can sync iteratively on a single thread, // Tests that given a root hash, a trie can sync iteratively on a single thread,
// requesting retrieval tasks and returning all of them in one go. // requesting retrieval tasks and returning all of them in one go.
func TestIterativeSyncIndividual(t *testing.T) { testIterativeSync(t, 1) } func TestIterativeSyncIndividual(t *testing.T) { testIterativeSync(t, 1, false) }
func TestIterativeSyncBatched(t *testing.T) { testIterativeSync(t, 100) } func TestIterativeSyncBatched(t *testing.T) { testIterativeSync(t, 100, false) }
func TestIterativeSyncIndividualByPath(t *testing.T) { testIterativeSync(t, 1, true) }
func TestIterativeSyncBatchedByPath(t *testing.T) { testIterativeSync(t, 100, true) }
func testIterativeSync(t *testing.T, count int) { func testIterativeSync(t *testing.T, count int, bypath bool) {
// Create a random trie to copy // Create a random trie to copy
srcDb, srcTrie, srcData := makeTestTrie() srcDb, srcTrie, srcData := makeTestTrie()
@ -114,16 +118,33 @@ func testIterativeSync(t *testing.T, count int) {
triedb := NewDatabase(diskdb) triedb := NewDatabase(diskdb)
sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb)) sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb))
queue := append([]common.Hash{}, sched.Missing(count)...) nodes, paths, codes := sched.Missing(count)
for len(queue) > 0 { var (
results := make([]SyncResult, len(queue)) hashQueue []common.Hash
for i, hash := range queue { pathQueue []SyncPath
)
if !bypath {
hashQueue = append(append(hashQueue[:0], nodes...), codes...)
} else {
hashQueue = append(hashQueue[:0], codes...)
pathQueue = append(pathQueue[:0], paths...)
}
for len(hashQueue)+len(pathQueue) > 0 {
results := make([]SyncResult, len(hashQueue)+len(pathQueue))
for i, hash := range hashQueue {
data, err := srcDb.Node(hash) data, err := srcDb.Node(hash)
if err != nil { if err != nil {
t.Fatalf("failed to retrieve node data for %x: %v", hash, err) t.Fatalf("failed to retrieve node data for hash %x: %v", hash, err)
} }
results[i] = SyncResult{hash, data} results[i] = SyncResult{hash, data}
} }
for i, path := range pathQueue {
data, _, err := srcTrie.TryGetNode(path[0])
if err != nil {
t.Fatalf("failed to retrieve node data for path %x: %v", path, err)
}
results[len(hashQueue)+i] = SyncResult{crypto.Keccak256Hash(data), data}
}
for _, result := range results { for _, result := range results {
if err := sched.Process(result); err != nil { if err := sched.Process(result); err != nil {
t.Fatalf("failed to process result %v", err) t.Fatalf("failed to process result %v", err)
@ -134,7 +155,14 @@ func testIterativeSync(t *testing.T, count int) {
t.Fatalf("failed to commit data: %v", err) t.Fatalf("failed to commit data: %v", err)
} }
batch.Write() batch.Write()
queue = append(queue[:0], sched.Missing(count)...)
nodes, paths, codes = sched.Missing(count)
if !bypath {
hashQueue = append(append(hashQueue[:0], nodes...), codes...)
} else {
hashQueue = append(hashQueue[:0], codes...)
pathQueue = append(pathQueue[:0], paths...)
}
} }
// Cross check that the two tries are in sync // Cross check that the two tries are in sync
checkTrieContents(t, triedb, srcTrie.Hash().Bytes(), srcData) checkTrieContents(t, triedb, srcTrie.Hash().Bytes(), srcData)
@ -151,7 +179,9 @@ func TestIterativeDelayedSync(t *testing.T) {
triedb := NewDatabase(diskdb) triedb := NewDatabase(diskdb)
sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb)) sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb))
queue := append([]common.Hash{}, sched.Missing(10000)...) nodes, _, codes := sched.Missing(10000)
queue := append(append([]common.Hash{}, nodes...), codes...)
for len(queue) > 0 { for len(queue) > 0 {
// Sync only half of the scheduled nodes // Sync only half of the scheduled nodes
results := make([]SyncResult, len(queue)/2+1) results := make([]SyncResult, len(queue)/2+1)
@ -172,7 +202,9 @@ func TestIterativeDelayedSync(t *testing.T) {
t.Fatalf("failed to commit data: %v", err) t.Fatalf("failed to commit data: %v", err)
} }
batch.Write() batch.Write()
queue = append(queue[len(results):], sched.Missing(10000)...)
nodes, _, codes = sched.Missing(10000)
queue = append(append(queue[len(results):], nodes...), codes...)
} }
// Cross check that the two tries are in sync // Cross check that the two tries are in sync
checkTrieContents(t, triedb, srcTrie.Hash().Bytes(), srcData) checkTrieContents(t, triedb, srcTrie.Hash().Bytes(), srcData)
@ -194,7 +226,8 @@ func testIterativeRandomSync(t *testing.T, count int) {
sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb)) sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb))
queue := make(map[common.Hash]struct{}) queue := make(map[common.Hash]struct{})
for _, hash := range sched.Missing(count) { nodes, _, codes := sched.Missing(count)
for _, hash := range append(nodes, codes...) {
queue[hash] = struct{}{} queue[hash] = struct{}{}
} }
for len(queue) > 0 { for len(queue) > 0 {
@ -218,8 +251,10 @@ func testIterativeRandomSync(t *testing.T, count int) {
t.Fatalf("failed to commit data: %v", err) t.Fatalf("failed to commit data: %v", err)
} }
batch.Write() batch.Write()
queue = make(map[common.Hash]struct{}) queue = make(map[common.Hash]struct{})
for _, hash := range sched.Missing(count) { nodes, _, codes = sched.Missing(count)
for _, hash := range append(nodes, codes...) {
queue[hash] = struct{}{} queue[hash] = struct{}{}
} }
} }
@ -239,7 +274,8 @@ func TestIterativeRandomDelayedSync(t *testing.T) {
sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb)) sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb))
queue := make(map[common.Hash]struct{}) queue := make(map[common.Hash]struct{})
for _, hash := range sched.Missing(10000) { nodes, _, codes := sched.Missing(10000)
for _, hash := range append(nodes, codes...) {
queue[hash] = struct{}{} queue[hash] = struct{}{}
} }
for len(queue) > 0 { for len(queue) > 0 {
@ -270,7 +306,8 @@ func TestIterativeRandomDelayedSync(t *testing.T) {
for _, result := range results { for _, result := range results {
delete(queue, result.Hash) delete(queue, result.Hash)
} }
for _, hash := range sched.Missing(10000) { nodes, _, codes = sched.Missing(10000)
for _, hash := range append(nodes, codes...) {
queue[hash] = struct{}{} queue[hash] = struct{}{}
} }
} }
@ -289,7 +326,8 @@ func TestDuplicateAvoidanceSync(t *testing.T) {
triedb := NewDatabase(diskdb) triedb := NewDatabase(diskdb)
sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb)) sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb))
queue := append([]common.Hash{}, sched.Missing(0)...) nodes, _, codes := sched.Missing(0)
queue := append(append([]common.Hash{}, nodes...), codes...)
requested := make(map[common.Hash]struct{}) requested := make(map[common.Hash]struct{})
for len(queue) > 0 { for len(queue) > 0 {
@ -316,7 +354,9 @@ func TestDuplicateAvoidanceSync(t *testing.T) {
t.Fatalf("failed to commit data: %v", err) t.Fatalf("failed to commit data: %v", err)
} }
batch.Write() batch.Write()
queue = append(queue[:0], sched.Missing(0)...)
nodes, _, codes = sched.Missing(0)
queue = append(append(queue[:0], nodes...), codes...)
} }
// Cross check that the two tries are in sync // Cross check that the two tries are in sync
checkTrieContents(t, triedb, srcTrie.Hash().Bytes(), srcData) checkTrieContents(t, triedb, srcTrie.Hash().Bytes(), srcData)
@ -334,7 +374,10 @@ func TestIncompleteSync(t *testing.T) {
sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb)) sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb))
var added []common.Hash var added []common.Hash
queue := append([]common.Hash{}, sched.Missing(1)...)
nodes, _, codes := sched.Missing(1)
queue := append(append([]common.Hash{}, nodes...), codes...)
for len(queue) > 0 { for len(queue) > 0 {
// Fetch a batch of trie nodes // Fetch a batch of trie nodes
results := make([]SyncResult, len(queue)) results := make([]SyncResult, len(queue))
@ -366,7 +409,8 @@ func TestIncompleteSync(t *testing.T) {
} }
} }
// Fetch the next batch to retrieve // Fetch the next batch to retrieve
queue = append(queue[:0], sched.Missing(1)...) nodes, _, codes = sched.Missing(1)
queue = append(append(queue[:0], nodes...), codes...)
} }
// Sanity check that removing any node from the database is detected // Sanity check that removing any node from the database is detected
for _, node := range added[1:] { for _, node := range added[1:] {
@ -380,3 +424,58 @@ func TestIncompleteSync(t *testing.T) {
diskdb.Put(key, value) diskdb.Put(key, value)
} }
} }
// Tests that trie nodes get scheduled lexicographically when having the same
// depth.
func TestSyncOrdering(t *testing.T) {
// Create a random trie to copy
srcDb, srcTrie, srcData := makeTestTrie()
// Create a destination trie and sync with the scheduler, tracking the requests
diskdb := memorydb.New()
triedb := NewDatabase(diskdb)
sched := NewSync(srcTrie.Hash(), diskdb, nil, NewSyncBloom(1, diskdb))
nodes, paths, _ := sched.Missing(1)
queue := append([]common.Hash{}, nodes...)
reqs := append([]SyncPath{}, paths...)
for len(queue) > 0 {
results := make([]SyncResult, len(queue))
for i, hash := range queue {
data, err := srcDb.Node(hash)
if err != nil {
t.Fatalf("failed to retrieve node data for %x: %v", hash, err)
}
results[i] = SyncResult{hash, data}
}
for _, result := range results {
if err := sched.Process(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
batch := diskdb.NewBatch()
if err := sched.Commit(batch); err != nil {
t.Fatalf("failed to commit data: %v", err)
}
batch.Write()
nodes, paths, _ = sched.Missing(1)
queue = append(queue[:0], nodes...)
reqs = append(reqs, paths...)
}
// Cross check that the two tries are in sync
checkTrieContents(t, triedb, srcTrie.Hash().Bytes(), srcData)
// Check that the trie nodes have been requested path-ordered
for i := 0; i < len(reqs)-1; i++ {
if len(reqs[i]) > 1 || len(reqs[i+1]) > 1 {
// In the case of the trie tests, there's no storage so the tuples
// must always be single items. 2-tuples should be tested in state.
t.Errorf("Invalid request tuples: len(%v) or len(%v) > 1", reqs[i], reqs[i+1])
}
if bytes.Compare(compactToHex(reqs[i][0]), compactToHex(reqs[i+1][0])) > 0 {
t.Errorf("Invalid request order: %v before %v", compactToHex(reqs[i][0]), compactToHex(reqs[i+1][0]))
}
}
}

84
trie/trie.go
Unescape View File

@ -25,6 +25,7 @@ import (
"github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto" "github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log" "github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
) )
var ( var (
@ -102,8 +103,7 @@ func (t *Trie) Get(key []byte) []byte {
// The value bytes must not be modified by the caller. // The value bytes must not be modified by the caller.
// If a node was not found in the database, a MissingNodeError is returned. // If a node was not found in the database, a MissingNodeError is returned.
func (t *Trie) TryGet(key []byte) ([]byte, error) { func (t *Trie) TryGet(key []byte) ([]byte, error) {
key = keybytesToHex(key) value, newroot, didResolve, err := t.tryGet(t.root, keybytesToHex(key), 0)
value, newroot, didResolve, err := t.tryGet(t.root, key, 0)
if err == nil && didResolve { if err == nil && didResolve {
t.root = newroot t.root = newroot
} }
@ -146,6 +146,86 @@ func (t *Trie) tryGet(origNode node, key []byte, pos int) (value []byte, newnode
} }
} }
// TryGetNode attempts to retrieve a trie node by compact-encoded path. It is not
// possible to use keybyte-encoding as the path might contain odd nibbles.
func (t *Trie) TryGetNode(path []byte) ([]byte, int, error) {
item, newroot, resolved, err := t.tryGetNode(t.root, compactToHex(path), 0)
if err != nil {
return nil, resolved, err
}
if resolved > 0 {
t.root = newroot
}
if item == nil {
return nil, resolved, nil
}
enc, err := rlp.EncodeToBytes(item)
if err != nil {
log.Error("Encoding existing trie node failed", "err", err)
return nil, resolved, err
}
return enc, resolved, err
}
func (t *Trie) tryGetNode(origNode node, path []byte, pos int) (item node, newnode node, resolved int, err error) {
// If we reached the requested path, return the current node
if pos >= len(path) {
// Don't return collapsed hash nodes though
if _, ok := origNode.(hashNode); !ok {
// Short nodes have expanded keys, compact them before returning
item := origNode
if sn, ok := item.(*shortNode); ok {
item = &shortNode{
Key: hexToCompact(sn.Key),
Val: sn.Val,
}
}
return item, origNode, 0, nil
}
}
// Path still needs to be traversed, descend into children
switch n := (origNode).(type) {
case nil:
// Non-existent path requested, abort
return nil, nil, 0, nil
case valueNode:
// Path prematurely ended, abort
return nil, nil, 0, nil
case *shortNode:
if len(path)-pos < len(n.Key) || !bytes.Equal(n.Key, path[pos:pos+len(n.Key)]) {
// Path branches off from short node
return nil, n, 0, nil
}
item, newnode, resolved, err = t.tryGetNode(n.Val, path, pos+len(n.Key))
if err == nil && resolved > 0 {
n = n.copy()
n.Val = newnode
}
return item, n, resolved, err
case *fullNode:
item, newnode, resolved, err = t.tryGetNode(n.Children[path[pos]], path, pos+1)
if err == nil && resolved > 0 {
n = n.copy()
n.Children[path[pos]] = newnode
}
return item, n, resolved, err
case hashNode:
child, err := t.resolveHash(n, path[:pos])
if err != nil {
return nil, n, 1, err
}
item, newnode, resolved, err := t.tryGetNode(child, path, pos)
return item, newnode, resolved + 1, err
default:
panic(fmt.Sprintf("%T: invalid node: %v", origNode, origNode))
}
}
// Update associates key with value in the trie. Subsequent calls to // Update associates key with value in the trie. Subsequent calls to
// Get will return value. If value has length zero, any existing value // Get will return value. If value has length zero, any existing value
// is deleted from the trie and calls to Get will return nil. // is deleted from the trie and calls to Get will return nil.

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