plugeth/core/state/sync_test.go

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// Copyright 2015 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 state
import (
"bytes"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
"github.com/ethereum/go-ethereum/triedb"
"github.com/ethereum/go-ethereum/triedb/hashdb"
"github.com/ethereum/go-ethereum/triedb/pathdb"
"github.com/holiman/uint256"
)
// testAccount is the data associated with an account used by the state tests.
type testAccount struct {
address common.Address
balance *uint256.Int
nonce uint64
code []byte
}
// makeTestState create a sample test state to test node-wise reconstruction.
func makeTestState(scheme string) (ethdb.Database, Database, *triedb.Database, common.Hash, []*testAccount) {
// Create an empty state
config := &triedb.Config{Preimages: true}
if scheme == rawdb.PathScheme {
config.PathDB = pathdb.Defaults
} else {
config.HashDB = hashdb.Defaults
}
db := rawdb.NewMemoryDatabase()
nodeDb := triedb.NewDatabase(db, config)
sdb := NewDatabaseWithNodeDB(db, nodeDb)
state, _ := New(types.EmptyRootHash, sdb, nil)
// Fill it with some arbitrary data
var accounts []*testAccount
for i := byte(0); i < 96; i++ {
obj := state.getOrNewStateObject(common.BytesToAddress([]byte{i}))
acc := &testAccount{address: common.BytesToAddress([]byte{i})}
obj.AddBalance(uint256.NewInt(uint64(11 * i)))
acc.balance = uint256.NewInt(uint64(11 * i))
obj.SetNonce(uint64(42 * i))
acc.nonce = uint64(42 * i)
if i%3 == 0 {
obj.SetCode(crypto.Keccak256Hash([]byte{i, i, i, i, i}), []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++ {
hash := crypto.Keccak256Hash([]byte{i, i, i, i, i, j, j})
obj.SetState(hash, hash)
}
}
accounts = append(accounts, acc)
}
root, _ := state.Commit(0, false)
// Return the generated state
return db, sdb, nodeDb, root, accounts
}
// checkStateAccounts cross references a reconstructed state with an expected
// account array.
func checkStateAccounts(t *testing.T, db ethdb.Database, scheme string, root common.Hash, accounts []*testAccount) {
var config triedb.Config
if scheme == rawdb.PathScheme {
config.PathDB = pathdb.Defaults
}
// Check root availability and state contents
state, err := New(root, NewDatabaseWithConfig(db, &config), nil)
if err != nil {
t.Fatalf("failed to create state trie at %x: %v", root, err)
}
if err := checkStateConsistency(db, scheme, root); err != nil {
t.Fatalf("inconsistent state trie at %x: %v", root, err)
}
for i, acc := range accounts {
if balance := state.GetBalance(acc.address); balance.Cmp(acc.balance) != 0 {
t.Errorf("account %d: balance mismatch: have %v, want %v", i, balance, acc.balance)
}
if nonce := state.GetNonce(acc.address); nonce != acc.nonce {
t.Errorf("account %d: nonce mismatch: have %v, want %v", i, nonce, acc.nonce)
}
if code := state.GetCode(acc.address); !bytes.Equal(code, acc.code) {
t.Errorf("account %d: code mismatch: have %x, want %x", i, code, acc.code)
}
}
}
// checkStateConsistency checks that all data of a state root is present.
func checkStateConsistency(db ethdb.Database, scheme string, root common.Hash) error {
config := &triedb.Config{Preimages: true}
if scheme == rawdb.PathScheme {
config.PathDB = pathdb.Defaults
}
state, err := New(root, NewDatabaseWithConfig(db, config), nil)
if err != nil {
return err
}
it := newNodeIterator(state)
for it.Next() {
}
return it.Error
}
// Tests that an empty state is not scheduled for syncing.
func TestEmptyStateSync(t *testing.T) {
dbA := triedb.NewDatabase(rawdb.NewMemoryDatabase(), nil)
dbB := triedb.NewDatabase(rawdb.NewMemoryDatabase(), &triedb.Config{PathDB: pathdb.Defaults})
sync := NewStateSync(types.EmptyRootHash, rawdb.NewMemoryDatabase(), nil, dbA.Scheme())
if paths, nodes, codes := sync.Missing(1); len(paths) != 0 || len(nodes) != 0 || len(codes) != 0 {
t.Errorf("content requested for empty state: %v, %v, %v", nodes, paths, codes)
}
sync = NewStateSync(types.EmptyRootHash, rawdb.NewMemoryDatabase(), nil, dbB.Scheme())
if paths, nodes, codes := sync.Missing(1); len(paths) != 0 || len(nodes) != 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,
// requesting retrieval tasks and returning all of them in one go.
func TestIterativeStateSyncIndividual(t *testing.T) {
testIterativeStateSync(t, 1, false, false, rawdb.HashScheme)
testIterativeStateSync(t, 1, false, false, rawdb.PathScheme)
}
func TestIterativeStateSyncBatched(t *testing.T) {
testIterativeStateSync(t, 100, false, false, rawdb.HashScheme)
testIterativeStateSync(t, 100, false, false, rawdb.PathScheme)
}
func TestIterativeStateSyncIndividualFromDisk(t *testing.T) {
testIterativeStateSync(t, 1, true, false, rawdb.HashScheme)
testIterativeStateSync(t, 1, true, false, rawdb.PathScheme)
}
func TestIterativeStateSyncBatchedFromDisk(t *testing.T) {
testIterativeStateSync(t, 100, true, false, rawdb.HashScheme)
testIterativeStateSync(t, 100, true, false, rawdb.PathScheme)
}
func TestIterativeStateSyncIndividualByPath(t *testing.T) {
testIterativeStateSync(t, 1, false, true, rawdb.HashScheme)
testIterativeStateSync(t, 1, false, true, rawdb.PathScheme)
}
func TestIterativeStateSyncBatchedByPath(t *testing.T) {
testIterativeStateSync(t, 100, false, true, rawdb.HashScheme)
testIterativeStateSync(t, 100, false, true, rawdb.PathScheme)
}
// stateElement represents the element in the state trie(bytecode or trie node).
type stateElement struct {
path string
hash common.Hash
code common.Hash
syncPath trie.SyncPath
}
func testIterativeStateSync(t *testing.T, count int, commit bool, bypath bool, scheme string) {
// Create a random state to copy
srcDisk, srcDb, ndb, srcRoot, srcAccounts := makeTestState(scheme)
if commit {
ndb.Commit(srcRoot, false)
}
srcTrie, _ := trie.New(trie.StateTrieID(srcRoot), ndb)
// Create a destination state and sync with the scheduler
dstDb := rawdb.NewMemoryDatabase()
sched := NewStateSync(srcRoot, dstDb, nil, ndb.Scheme())
var (
nodeElements []stateElement
codeElements []stateElement
)
paths, nodes, codes := sched.Missing(count)
for i := 0; i < len(paths); i++ {
nodeElements = append(nodeElements, stateElement{
path: paths[i],
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(paths[i])),
})
}
for i := 0; i < len(codes); i++ {
codeElements = append(codeElements, stateElement{code: codes[i]})
}
reader, err := ndb.Reader(srcRoot)
if err != nil {
t.Fatalf("state is not existent, %#x", srcRoot)
}
for len(nodeElements)+len(codeElements) > 0 {
var (
nodeResults = make([]trie.NodeSyncResult, len(nodeElements))
codeResults = make([]trie.CodeSyncResult, len(codeElements))
)
for i, element := range codeElements {
data, err := srcDb.ContractCode(common.Address{}, element.code)
if err != nil {
t.Fatalf("failed to retrieve contract bytecode for hash %x", element.code)
}
codeResults[i] = trie.CodeSyncResult{Hash: element.code, Data: data}
}
for i, node := range nodeElements {
if bypath {
if len(node.syncPath) == 1 {
data, _, err := srcTrie.GetNode(node.syncPath[0])
if err != nil {
t.Fatalf("failed to retrieve node data for path %x: %v", node.syncPath[0], err)
}
nodeResults[i] = trie.NodeSyncResult{Path: node.path, Data: data}
} else {
var acc types.StateAccount
if err := rlp.DecodeBytes(srcTrie.MustGet(node.syncPath[0]), &acc); err != nil {
t.Fatalf("failed to decode account on path %x: %v", node.syncPath[0], err)
}
id := trie.StorageTrieID(srcRoot, common.BytesToHash(node.syncPath[0]), acc.Root)
stTrie, err := trie.New(id, ndb)
if err != nil {
2024-02-05 21:16:32 +00:00
t.Fatalf("failed to retrieve storage trie for path %x: %v", node.syncPath[1], err)
}
data, _, err := stTrie.GetNode(node.syncPath[1])
if err != nil {
t.Fatalf("failed to retrieve node data for path %x: %v", node.syncPath[1], err)
}
nodeResults[i] = trie.NodeSyncResult{Path: node.path, Data: data}
}
} else {
owner, inner := trie.ResolvePath([]byte(node.path))
data, err := reader.Node(owner, inner, node.hash)
if err != nil {
t.Fatalf("failed to retrieve node data for key %v", []byte(node.path))
}
nodeResults[i] = trie.NodeSyncResult{Path: node.path, Data: data}
}
}
for _, result := range codeResults {
if err := sched.ProcessCode(result); err != nil {
t.Errorf("failed to process result %v", err)
}
}
for _, result := range nodeResults {
if err := sched.ProcessNode(result); err != nil {
t.Errorf("failed to process result %v", err)
}
}
batch := dstDb.NewBatch()
if err := sched.Commit(batch); err != nil {
t.Fatalf("failed to commit data: %v", err)
eth/downloader: separate state sync from queue (#14460) * eth/downloader: separate state sync from queue Scheduling of state node downloads hogged the downloader queue lock when new requests were scheduled. This caused timeouts for other requests. With this change, state sync is fully independent of all other downloads and doesn't involve the queue at all. State sync is started and checked on in processContent. This is slightly awkward because processContent doesn't have a select loop. Instead, the queue is closed by an auxiliary goroutine when state sync fails. We tried several alternatives to this but settled on the current approach because it's the least amount of change overall. Handling of the pivot block has changed slightly: the queue previously prevented import of pivot block receipts before the state of the pivot block was available. In this commit, the receipt will be imported before the state. This causes an annoyance where the pivot block is committed as fast block head even when state downloads fail. Stay tuned for more updates in this area ;) * eth/downloader: remove cancelTimeout channel * eth/downloader: retry state requests on timeout * eth/downloader: improve comment * eth/downloader: mark peers idle when state sync is done * eth/downloader: move pivot block splitting to processContent This change also ensures that pivot block receipts aren't imported before the pivot block itself. * eth/downloader: limit state node retries * eth/downloader: improve state node error handling and retry check * eth/downloader: remove maxStateNodeRetries It fails the sync too much. * eth/downloader: remove last use of cancelCh in statesync.go Fixes TestDeliverHeadersHang*Fast and (hopefully) the weird cancellation behaviour at the end of fast sync. * eth/downloader: fix leak in runStateSync * eth/downloader: don't run processFullSyncContent in LightSync mode * eth/downloader: improve comments * eth/downloader: fix vet, megacheck * eth/downloader: remove unrequested tasks anyway * eth/downloader, trie: various polishes around duplicate items This commit explicitly tracks duplicate and unexpected state delieveries done against a trie Sync structure, also adding there to import info logs. The commit moves the db batch used to commit trie changes one level deeper so its flushed after every node insertion. This is needed to avoid a lot of duplicate retrievals caused by inconsistencies between Sync internals and database. A better approach is to track not-yet-written states in trie.Sync and flush on commit, but I'm focuing on correctness first now. The commit fixes a regression around pivot block fail count. The counter previously was reset to 1 if and only if a sync cycle progressed (inserted at least 1 entry to the database). The current code reset it already if a node was delivered, which is not stong enough, because unless it ends up written to disk, an attacker can just loop and attack ad infinitum. The commit also fixes a regression around state deliveries and timeouts. The old downloader tracked if a delivery is stale (none of the deliveries were requestedt), in which case it didn't mark the node idle and did not send further requests, since it signals a past timeout. The current code did mark it idle even on stale deliveries, which eventually caused two requests to be in flight at the same time, making the deliveries always stale and mass duplicating retrievals between multiple peers. * eth/downloader: fix state request leak This commit fixes the hang seen sometimes while doing the state sync. The cause of the hang was a rare combination of events: request state data from peer, peer drops and reconnects almost immediately. This caused a new download task to be assigned to the peer, overwriting the old one still waiting for a timeout, which in turned leaked the requests out, never to be retried. The fix is to ensure that a task assignment moves any pending one back into the retry queue. The commit also fixes a regression with peer dropping due to stalls. The current code considered a peer stalling if they timed out delivering 1 item. However, the downloader never requests only one, the minimum is 2 (attempt to fine tune estimated latency/bandwidth). The fix is simply to drop if a timeout is detected at 2 items. Apart from the above bugfixes, the commit contains some code polishes I made while debugging the hang. * core, eth, trie: support batched trie sync db writes * trie: rename SyncMemCache to syncMemBatch
2017-06-22 12:26:03 +00:00
}
batch.Write()
paths, nodes, codes = sched.Missing(count)
nodeElements = nodeElements[:0]
for i := 0; i < len(paths); i++ {
nodeElements = append(nodeElements, stateElement{
path: paths[i],
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(paths[i])),
})
}
codeElements = codeElements[:0]
for i := 0; i < len(codes); i++ {
codeElements = append(codeElements, stateElement{
code: codes[i],
})
}
}
// Copy the preimages from source db in order to traverse the state.
srcDb.TrieDB().WritePreimages()
copyPreimages(srcDisk, dstDb)
// Cross check that the two states are in sync
checkStateAccounts(t, dstDb, ndb.Scheme(), srcRoot, srcAccounts)
}
// Tests that the trie scheduler can correctly reconstruct the state even if only
// partial results are returned, and the others sent only later.
func TestIterativeDelayedStateSync(t *testing.T) {
testIterativeDelayedStateSync(t, rawdb.HashScheme)
testIterativeDelayedStateSync(t, rawdb.PathScheme)
}
func testIterativeDelayedStateSync(t *testing.T, scheme string) {
// Create a random state to copy
srcDisk, srcDb, ndb, srcRoot, srcAccounts := makeTestState(scheme)
// Create a destination state and sync with the scheduler
dstDb := rawdb.NewMemoryDatabase()
sched := NewStateSync(srcRoot, dstDb, nil, ndb.Scheme())
var (
nodeElements []stateElement
codeElements []stateElement
)
paths, nodes, codes := sched.Missing(0)
for i := 0; i < len(paths); i++ {
nodeElements = append(nodeElements, stateElement{
path: paths[i],
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(paths[i])),
})
}
for i := 0; i < len(codes); i++ {
codeElements = append(codeElements, stateElement{code: codes[i]})
}
reader, err := ndb.Reader(srcRoot)
if err != nil {
t.Fatalf("state is not existent, %#x", srcRoot)
}
for len(nodeElements)+len(codeElements) > 0 {
// Sync only half of the scheduled nodes
var nodeProcessed int
var codeProcessed int
if len(codeElements) > 0 {
codeResults := make([]trie.CodeSyncResult, len(codeElements)/2+1)
for i, element := range codeElements[:len(codeResults)] {
data, err := srcDb.ContractCode(common.Address{}, element.code)
if err != nil {
t.Fatalf("failed to retrieve contract bytecode for %x", element.code)
}
codeResults[i] = trie.CodeSyncResult{Hash: element.code, Data: data}
}
for _, result := range codeResults {
if err := sched.ProcessCode(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
codeProcessed = len(codeResults)
}
if len(nodeElements) > 0 {
nodeResults := make([]trie.NodeSyncResult, len(nodeElements)/2+1)
for i, element := range nodeElements[:len(nodeResults)] {
owner, inner := trie.ResolvePath([]byte(element.path))
data, err := reader.Node(owner, inner, element.hash)
if err != nil {
t.Fatalf("failed to retrieve contract bytecode for %x", element.code)
}
nodeResults[i] = trie.NodeSyncResult{Path: element.path, Data: data}
}
for _, result := range nodeResults {
if err := sched.ProcessNode(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
nodeProcessed = len(nodeResults)
}
batch := dstDb.NewBatch()
if err := sched.Commit(batch); err != nil {
t.Fatalf("failed to commit data: %v", err)
eth/downloader: separate state sync from queue (#14460) * eth/downloader: separate state sync from queue Scheduling of state node downloads hogged the downloader queue lock when new requests were scheduled. This caused timeouts for other requests. With this change, state sync is fully independent of all other downloads and doesn't involve the queue at all. State sync is started and checked on in processContent. This is slightly awkward because processContent doesn't have a select loop. Instead, the queue is closed by an auxiliary goroutine when state sync fails. We tried several alternatives to this but settled on the current approach because it's the least amount of change overall. Handling of the pivot block has changed slightly: the queue previously prevented import of pivot block receipts before the state of the pivot block was available. In this commit, the receipt will be imported before the state. This causes an annoyance where the pivot block is committed as fast block head even when state downloads fail. Stay tuned for more updates in this area ;) * eth/downloader: remove cancelTimeout channel * eth/downloader: retry state requests on timeout * eth/downloader: improve comment * eth/downloader: mark peers idle when state sync is done * eth/downloader: move pivot block splitting to processContent This change also ensures that pivot block receipts aren't imported before the pivot block itself. * eth/downloader: limit state node retries * eth/downloader: improve state node error handling and retry check * eth/downloader: remove maxStateNodeRetries It fails the sync too much. * eth/downloader: remove last use of cancelCh in statesync.go Fixes TestDeliverHeadersHang*Fast and (hopefully) the weird cancellation behaviour at the end of fast sync. * eth/downloader: fix leak in runStateSync * eth/downloader: don't run processFullSyncContent in LightSync mode * eth/downloader: improve comments * eth/downloader: fix vet, megacheck * eth/downloader: remove unrequested tasks anyway * eth/downloader, trie: various polishes around duplicate items This commit explicitly tracks duplicate and unexpected state delieveries done against a trie Sync structure, also adding there to import info logs. The commit moves the db batch used to commit trie changes one level deeper so its flushed after every node insertion. This is needed to avoid a lot of duplicate retrievals caused by inconsistencies between Sync internals and database. A better approach is to track not-yet-written states in trie.Sync and flush on commit, but I'm focuing on correctness first now. The commit fixes a regression around pivot block fail count. The counter previously was reset to 1 if and only if a sync cycle progressed (inserted at least 1 entry to the database). The current code reset it already if a node was delivered, which is not stong enough, because unless it ends up written to disk, an attacker can just loop and attack ad infinitum. The commit also fixes a regression around state deliveries and timeouts. The old downloader tracked if a delivery is stale (none of the deliveries were requestedt), in which case it didn't mark the node idle and did not send further requests, since it signals a past timeout. The current code did mark it idle even on stale deliveries, which eventually caused two requests to be in flight at the same time, making the deliveries always stale and mass duplicating retrievals between multiple peers. * eth/downloader: fix state request leak This commit fixes the hang seen sometimes while doing the state sync. The cause of the hang was a rare combination of events: request state data from peer, peer drops and reconnects almost immediately. This caused a new download task to be assigned to the peer, overwriting the old one still waiting for a timeout, which in turned leaked the requests out, never to be retried. The fix is to ensure that a task assignment moves any pending one back into the retry queue. The commit also fixes a regression with peer dropping due to stalls. The current code considered a peer stalling if they timed out delivering 1 item. However, the downloader never requests only one, the minimum is 2 (attempt to fine tune estimated latency/bandwidth). The fix is simply to drop if a timeout is detected at 2 items. Apart from the above bugfixes, the commit contains some code polishes I made while debugging the hang. * core, eth, trie: support batched trie sync db writes * trie: rename SyncMemCache to syncMemBatch
2017-06-22 12:26:03 +00:00
}
batch.Write()
paths, nodes, codes = sched.Missing(0)
nodeElements = nodeElements[nodeProcessed:]
for i := 0; i < len(paths); i++ {
nodeElements = append(nodeElements, stateElement{
path: paths[i],
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(paths[i])),
})
}
codeElements = codeElements[codeProcessed:]
for i := 0; i < len(codes); i++ {
codeElements = append(codeElements, stateElement{
code: codes[i],
})
}
}
// Copy the preimages from source db in order to traverse the state.
srcDb.TrieDB().WritePreimages()
copyPreimages(srcDisk, dstDb)
// Cross check that the two states are in sync
checkStateAccounts(t, dstDb, ndb.Scheme(), srcRoot, srcAccounts)
}
// 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, however in a
// random order.
func TestIterativeRandomStateSyncIndividual(t *testing.T) {
testIterativeRandomStateSync(t, 1, rawdb.HashScheme)
testIterativeRandomStateSync(t, 1, rawdb.PathScheme)
}
func TestIterativeRandomStateSyncBatched(t *testing.T) {
testIterativeRandomStateSync(t, 100, rawdb.HashScheme)
testIterativeRandomStateSync(t, 100, rawdb.PathScheme)
}
func testIterativeRandomStateSync(t *testing.T, count int, scheme string) {
// Create a random state to copy
srcDisk, srcDb, ndb, srcRoot, srcAccounts := makeTestState(scheme)
// Create a destination state and sync with the scheduler
dstDb := rawdb.NewMemoryDatabase()
sched := NewStateSync(srcRoot, dstDb, nil, ndb.Scheme())
nodeQueue := make(map[string]stateElement)
codeQueue := make(map[common.Hash]struct{})
paths, nodes, codes := sched.Missing(count)
for i, path := range paths {
nodeQueue[path] = stateElement{
path: path,
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(path)),
}
}
for _, hash := range codes {
codeQueue[hash] = struct{}{}
}
reader, err := ndb.Reader(srcRoot)
if err != nil {
t.Fatalf("state is not existent, %#x", srcRoot)
}
for len(nodeQueue)+len(codeQueue) > 0 {
// Fetch all the queued nodes in a random order
if len(codeQueue) > 0 {
results := make([]trie.CodeSyncResult, 0, len(codeQueue))
for hash := range codeQueue {
data, err := srcDb.ContractCode(common.Address{}, hash)
if err != nil {
t.Fatalf("failed to retrieve node data for %x", hash)
}
results = append(results, trie.CodeSyncResult{Hash: hash, Data: data})
}
for _, result := range results {
if err := sched.ProcessCode(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
}
if len(nodeQueue) > 0 {
results := make([]trie.NodeSyncResult, 0, len(nodeQueue))
for path, element := range nodeQueue {
owner, inner := trie.ResolvePath([]byte(element.path))
data, err := reader.Node(owner, inner, element.hash)
if err != nil {
t.Fatalf("failed to retrieve node data for %x %v %v", element.hash, []byte(element.path), element.path)
}
results = append(results, trie.NodeSyncResult{Path: path, Data: data})
}
for _, result := range results {
if err := sched.ProcessNode(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
}
batch := dstDb.NewBatch()
if err := sched.Commit(batch); err != nil {
t.Fatalf("failed to commit data: %v", err)
eth/downloader: separate state sync from queue (#14460) * eth/downloader: separate state sync from queue Scheduling of state node downloads hogged the downloader queue lock when new requests were scheduled. This caused timeouts for other requests. With this change, state sync is fully independent of all other downloads and doesn't involve the queue at all. State sync is started and checked on in processContent. This is slightly awkward because processContent doesn't have a select loop. Instead, the queue is closed by an auxiliary goroutine when state sync fails. We tried several alternatives to this but settled on the current approach because it's the least amount of change overall. Handling of the pivot block has changed slightly: the queue previously prevented import of pivot block receipts before the state of the pivot block was available. In this commit, the receipt will be imported before the state. This causes an annoyance where the pivot block is committed as fast block head even when state downloads fail. Stay tuned for more updates in this area ;) * eth/downloader: remove cancelTimeout channel * eth/downloader: retry state requests on timeout * eth/downloader: improve comment * eth/downloader: mark peers idle when state sync is done * eth/downloader: move pivot block splitting to processContent This change also ensures that pivot block receipts aren't imported before the pivot block itself. * eth/downloader: limit state node retries * eth/downloader: improve state node error handling and retry check * eth/downloader: remove maxStateNodeRetries It fails the sync too much. * eth/downloader: remove last use of cancelCh in statesync.go Fixes TestDeliverHeadersHang*Fast and (hopefully) the weird cancellation behaviour at the end of fast sync. * eth/downloader: fix leak in runStateSync * eth/downloader: don't run processFullSyncContent in LightSync mode * eth/downloader: improve comments * eth/downloader: fix vet, megacheck * eth/downloader: remove unrequested tasks anyway * eth/downloader, trie: various polishes around duplicate items This commit explicitly tracks duplicate and unexpected state delieveries done against a trie Sync structure, also adding there to import info logs. The commit moves the db batch used to commit trie changes one level deeper so its flushed after every node insertion. This is needed to avoid a lot of duplicate retrievals caused by inconsistencies between Sync internals and database. A better approach is to track not-yet-written states in trie.Sync and flush on commit, but I'm focuing on correctness first now. The commit fixes a regression around pivot block fail count. The counter previously was reset to 1 if and only if a sync cycle progressed (inserted at least 1 entry to the database). The current code reset it already if a node was delivered, which is not stong enough, because unless it ends up written to disk, an attacker can just loop and attack ad infinitum. The commit also fixes a regression around state deliveries and timeouts. The old downloader tracked if a delivery is stale (none of the deliveries were requestedt), in which case it didn't mark the node idle and did not send further requests, since it signals a past timeout. The current code did mark it idle even on stale deliveries, which eventually caused two requests to be in flight at the same time, making the deliveries always stale and mass duplicating retrievals between multiple peers. * eth/downloader: fix state request leak This commit fixes the hang seen sometimes while doing the state sync. The cause of the hang was a rare combination of events: request state data from peer, peer drops and reconnects almost immediately. This caused a new download task to be assigned to the peer, overwriting the old one still waiting for a timeout, which in turned leaked the requests out, never to be retried. The fix is to ensure that a task assignment moves any pending one back into the retry queue. The commit also fixes a regression with peer dropping due to stalls. The current code considered a peer stalling if they timed out delivering 1 item. However, the downloader never requests only one, the minimum is 2 (attempt to fine tune estimated latency/bandwidth). The fix is simply to drop if a timeout is detected at 2 items. Apart from the above bugfixes, the commit contains some code polishes I made while debugging the hang. * core, eth, trie: support batched trie sync db writes * trie: rename SyncMemCache to syncMemBatch
2017-06-22 12:26:03 +00:00
}
batch.Write()
nodeQueue = make(map[string]stateElement)
codeQueue = make(map[common.Hash]struct{})
paths, nodes, codes := sched.Missing(count)
for i, path := range paths {
nodeQueue[path] = stateElement{
path: path,
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(path)),
}
}
for _, hash := range codes {
codeQueue[hash] = struct{}{}
}
}
// Copy the preimages from source db in order to traverse the state.
srcDb.TrieDB().WritePreimages()
copyPreimages(srcDisk, dstDb)
// Cross check that the two states are in sync
checkStateAccounts(t, dstDb, ndb.Scheme(), srcRoot, srcAccounts)
}
// Tests that the trie scheduler can correctly reconstruct the state even if only
// partial results are returned (Even those randomly), others sent only later.
func TestIterativeRandomDelayedStateSync(t *testing.T) {
testIterativeRandomDelayedStateSync(t, rawdb.HashScheme)
testIterativeRandomDelayedStateSync(t, rawdb.PathScheme)
}
func testIterativeRandomDelayedStateSync(t *testing.T, scheme string) {
// Create a random state to copy
srcDisk, srcDb, ndb, srcRoot, srcAccounts := makeTestState(scheme)
// Create a destination state and sync with the scheduler
dstDb := rawdb.NewMemoryDatabase()
sched := NewStateSync(srcRoot, dstDb, nil, ndb.Scheme())
nodeQueue := make(map[string]stateElement)
codeQueue := make(map[common.Hash]struct{})
paths, nodes, codes := sched.Missing(0)
for i, path := range paths {
nodeQueue[path] = stateElement{
path: path,
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(path)),
}
}
for _, hash := range codes {
codeQueue[hash] = struct{}{}
}
reader, err := ndb.Reader(srcRoot)
if err != nil {
t.Fatalf("state is not existent, %#x", srcRoot)
}
for len(nodeQueue)+len(codeQueue) > 0 {
// Sync only half of the scheduled nodes, even those in random order
if len(codeQueue) > 0 {
results := make([]trie.CodeSyncResult, 0, len(codeQueue)/2+1)
for hash := range codeQueue {
delete(codeQueue, hash)
data, err := srcDb.ContractCode(common.Address{}, hash)
if err != nil {
t.Fatalf("failed to retrieve node data for %x", hash)
}
results = append(results, trie.CodeSyncResult{Hash: hash, Data: data})
if len(results) >= cap(results) {
break
}
}
for _, result := range results {
if err := sched.ProcessCode(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
}
if len(nodeQueue) > 0 {
results := make([]trie.NodeSyncResult, 0, len(nodeQueue)/2+1)
for path, element := range nodeQueue {
delete(nodeQueue, path)
owner, inner := trie.ResolvePath([]byte(element.path))
data, err := reader.Node(owner, inner, element.hash)
if err != nil {
t.Fatalf("failed to retrieve node data for %x", element.hash)
}
results = append(results, trie.NodeSyncResult{Path: path, Data: data})
if len(results) >= cap(results) {
break
}
}
// Feed the retrieved results back and queue new tasks
for _, result := range results {
if err := sched.ProcessNode(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
}
batch := dstDb.NewBatch()
if err := sched.Commit(batch); err != nil {
t.Fatalf("failed to commit data: %v", err)
eth/downloader: separate state sync from queue (#14460) * eth/downloader: separate state sync from queue Scheduling of state node downloads hogged the downloader queue lock when new requests were scheduled. This caused timeouts for other requests. With this change, state sync is fully independent of all other downloads and doesn't involve the queue at all. State sync is started and checked on in processContent. This is slightly awkward because processContent doesn't have a select loop. Instead, the queue is closed by an auxiliary goroutine when state sync fails. We tried several alternatives to this but settled on the current approach because it's the least amount of change overall. Handling of the pivot block has changed slightly: the queue previously prevented import of pivot block receipts before the state of the pivot block was available. In this commit, the receipt will be imported before the state. This causes an annoyance where the pivot block is committed as fast block head even when state downloads fail. Stay tuned for more updates in this area ;) * eth/downloader: remove cancelTimeout channel * eth/downloader: retry state requests on timeout * eth/downloader: improve comment * eth/downloader: mark peers idle when state sync is done * eth/downloader: move pivot block splitting to processContent This change also ensures that pivot block receipts aren't imported before the pivot block itself. * eth/downloader: limit state node retries * eth/downloader: improve state node error handling and retry check * eth/downloader: remove maxStateNodeRetries It fails the sync too much. * eth/downloader: remove last use of cancelCh in statesync.go Fixes TestDeliverHeadersHang*Fast and (hopefully) the weird cancellation behaviour at the end of fast sync. * eth/downloader: fix leak in runStateSync * eth/downloader: don't run processFullSyncContent in LightSync mode * eth/downloader: improve comments * eth/downloader: fix vet, megacheck * eth/downloader: remove unrequested tasks anyway * eth/downloader, trie: various polishes around duplicate items This commit explicitly tracks duplicate and unexpected state delieveries done against a trie Sync structure, also adding there to import info logs. The commit moves the db batch used to commit trie changes one level deeper so its flushed after every node insertion. This is needed to avoid a lot of duplicate retrievals caused by inconsistencies between Sync internals and database. A better approach is to track not-yet-written states in trie.Sync and flush on commit, but I'm focuing on correctness first now. The commit fixes a regression around pivot block fail count. The counter previously was reset to 1 if and only if a sync cycle progressed (inserted at least 1 entry to the database). The current code reset it already if a node was delivered, which is not stong enough, because unless it ends up written to disk, an attacker can just loop and attack ad infinitum. The commit also fixes a regression around state deliveries and timeouts. The old downloader tracked if a delivery is stale (none of the deliveries were requestedt), in which case it didn't mark the node idle and did not send further requests, since it signals a past timeout. The current code did mark it idle even on stale deliveries, which eventually caused two requests to be in flight at the same time, making the deliveries always stale and mass duplicating retrievals between multiple peers. * eth/downloader: fix state request leak This commit fixes the hang seen sometimes while doing the state sync. The cause of the hang was a rare combination of events: request state data from peer, peer drops and reconnects almost immediately. This caused a new download task to be assigned to the peer, overwriting the old one still waiting for a timeout, which in turned leaked the requests out, never to be retried. The fix is to ensure that a task assignment moves any pending one back into the retry queue. The commit also fixes a regression with peer dropping due to stalls. The current code considered a peer stalling if they timed out delivering 1 item. However, the downloader never requests only one, the minimum is 2 (attempt to fine tune estimated latency/bandwidth). The fix is simply to drop if a timeout is detected at 2 items. Apart from the above bugfixes, the commit contains some code polishes I made while debugging the hang. * core, eth, trie: support batched trie sync db writes * trie: rename SyncMemCache to syncMemBatch
2017-06-22 12:26:03 +00:00
}
batch.Write()
paths, nodes, codes := sched.Missing(0)
for i, path := range paths {
nodeQueue[path] = stateElement{
path: path,
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(path)),
}
}
for _, hash := range codes {
codeQueue[hash] = struct{}{}
}
}
// Copy the preimages from source db in order to traverse the state.
srcDb.TrieDB().WritePreimages()
copyPreimages(srcDisk, dstDb)
// Cross check that the two states are in sync
checkStateAccounts(t, dstDb, ndb.Scheme(), srcRoot, srcAccounts)
}
// Tests that at any point in time during a sync, only complete sub-tries are in
// the database.
func TestIncompleteStateSync(t *testing.T) {
testIncompleteStateSync(t, rawdb.HashScheme)
testIncompleteStateSync(t, rawdb.PathScheme)
}
func testIncompleteStateSync(t *testing.T, scheme string) {
// Create a random state to copy
db, srcDb, ndb, srcRoot, srcAccounts := makeTestState(scheme)
// isCodeLookup to save some hashing
var isCode = make(map[common.Hash]struct{})
for _, acc := range srcAccounts {
if len(acc.code) > 0 {
isCode[crypto.Keccak256Hash(acc.code)] = struct{}{}
}
}
isCode[types.EmptyCodeHash] = struct{}{}
// Create a destination state and sync with the scheduler
dstDb := rawdb.NewMemoryDatabase()
sched := NewStateSync(srcRoot, dstDb, nil, ndb.Scheme())
var (
addedCodes []common.Hash
addedPaths []string
addedHashes []common.Hash
)
reader, err := ndb.Reader(srcRoot)
if err != nil {
t.Fatalf("state is not available %x", srcRoot)
}
nodeQueue := make(map[string]stateElement)
codeQueue := make(map[common.Hash]struct{})
paths, nodes, codes := sched.Missing(1)
for i, path := range paths {
nodeQueue[path] = stateElement{
path: path,
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(path)),
}
}
for _, hash := range codes {
codeQueue[hash] = struct{}{}
}
for len(nodeQueue)+len(codeQueue) > 0 {
// Fetch a batch of state nodes
if len(codeQueue) > 0 {
results := make([]trie.CodeSyncResult, 0, len(codeQueue))
for hash := range codeQueue {
data, err := srcDb.ContractCode(common.Address{}, hash)
if err != nil {
t.Fatalf("failed to retrieve node data for %x", hash)
}
results = append(results, trie.CodeSyncResult{Hash: hash, Data: data})
addedCodes = append(addedCodes, hash)
}
// Process each of the state nodes
for _, result := range results {
if err := sched.ProcessCode(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
}
if len(nodeQueue) > 0 {
results := make([]trie.NodeSyncResult, 0, len(nodeQueue))
for path, element := range nodeQueue {
owner, inner := trie.ResolvePath([]byte(element.path))
data, err := reader.Node(owner, inner, element.hash)
if err != nil {
t.Fatalf("failed to retrieve node data for %x", element.hash)
}
results = append(results, trie.NodeSyncResult{Path: path, Data: data})
if element.hash != srcRoot {
addedPaths = append(addedPaths, element.path)
addedHashes = append(addedHashes, element.hash)
}
}
// Process each of the state nodes
for _, result := range results {
if err := sched.ProcessNode(result); err != nil {
t.Fatalf("failed to process result %v", err)
}
}
}
batch := dstDb.NewBatch()
if err := sched.Commit(batch); err != nil {
t.Fatalf("failed to commit data: %v", err)
eth/downloader: separate state sync from queue (#14460) * eth/downloader: separate state sync from queue Scheduling of state node downloads hogged the downloader queue lock when new requests were scheduled. This caused timeouts for other requests. With this change, state sync is fully independent of all other downloads and doesn't involve the queue at all. State sync is started and checked on in processContent. This is slightly awkward because processContent doesn't have a select loop. Instead, the queue is closed by an auxiliary goroutine when state sync fails. We tried several alternatives to this but settled on the current approach because it's the least amount of change overall. Handling of the pivot block has changed slightly: the queue previously prevented import of pivot block receipts before the state of the pivot block was available. In this commit, the receipt will be imported before the state. This causes an annoyance where the pivot block is committed as fast block head even when state downloads fail. Stay tuned for more updates in this area ;) * eth/downloader: remove cancelTimeout channel * eth/downloader: retry state requests on timeout * eth/downloader: improve comment * eth/downloader: mark peers idle when state sync is done * eth/downloader: move pivot block splitting to processContent This change also ensures that pivot block receipts aren't imported before the pivot block itself. * eth/downloader: limit state node retries * eth/downloader: improve state node error handling and retry check * eth/downloader: remove maxStateNodeRetries It fails the sync too much. * eth/downloader: remove last use of cancelCh in statesync.go Fixes TestDeliverHeadersHang*Fast and (hopefully) the weird cancellation behaviour at the end of fast sync. * eth/downloader: fix leak in runStateSync * eth/downloader: don't run processFullSyncContent in LightSync mode * eth/downloader: improve comments * eth/downloader: fix vet, megacheck * eth/downloader: remove unrequested tasks anyway * eth/downloader, trie: various polishes around duplicate items This commit explicitly tracks duplicate and unexpected state delieveries done against a trie Sync structure, also adding there to import info logs. The commit moves the db batch used to commit trie changes one level deeper so its flushed after every node insertion. This is needed to avoid a lot of duplicate retrievals caused by inconsistencies between Sync internals and database. A better approach is to track not-yet-written states in trie.Sync and flush on commit, but I'm focuing on correctness first now. The commit fixes a regression around pivot block fail count. The counter previously was reset to 1 if and only if a sync cycle progressed (inserted at least 1 entry to the database). The current code reset it already if a node was delivered, which is not stong enough, because unless it ends up written to disk, an attacker can just loop and attack ad infinitum. The commit also fixes a regression around state deliveries and timeouts. The old downloader tracked if a delivery is stale (none of the deliveries were requestedt), in which case it didn't mark the node idle and did not send further requests, since it signals a past timeout. The current code did mark it idle even on stale deliveries, which eventually caused two requests to be in flight at the same time, making the deliveries always stale and mass duplicating retrievals between multiple peers. * eth/downloader: fix state request leak This commit fixes the hang seen sometimes while doing the state sync. The cause of the hang was a rare combination of events: request state data from peer, peer drops and reconnects almost immediately. This caused a new download task to be assigned to the peer, overwriting the old one still waiting for a timeout, which in turned leaked the requests out, never to be retried. The fix is to ensure that a task assignment moves any pending one back into the retry queue. The commit also fixes a regression with peer dropping due to stalls. The current code considered a peer stalling if they timed out delivering 1 item. However, the downloader never requests only one, the minimum is 2 (attempt to fine tune estimated latency/bandwidth). The fix is simply to drop if a timeout is detected at 2 items. Apart from the above bugfixes, the commit contains some code polishes I made while debugging the hang. * core, eth, trie: support batched trie sync db writes * trie: rename SyncMemCache to syncMemBatch
2017-06-22 12:26:03 +00:00
}
batch.Write()
// Fetch the next batch to retrieve
nodeQueue = make(map[string]stateElement)
codeQueue = make(map[common.Hash]struct{})
paths, nodes, codes := sched.Missing(1)
for i, path := range paths {
nodeQueue[path] = stateElement{
path: path,
hash: nodes[i],
syncPath: trie.NewSyncPath([]byte(path)),
}
}
for _, hash := range codes {
codeQueue[hash] = struct{}{}
}
}
// Copy the preimages from source db in order to traverse the state.
srcDb.TrieDB().WritePreimages()
copyPreimages(db, dstDb)
// Sanity check that removing any node from the database is detected
for _, node := range addedCodes {
val := rawdb.ReadCode(dstDb, node)
rawdb.DeleteCode(dstDb, node)
if err := checkStateConsistency(dstDb, ndb.Scheme(), srcRoot); err == nil {
t.Errorf("trie inconsistency not caught, missing: %x", node)
}
rawdb.WriteCode(dstDb, node, val)
}
for i, path := range addedPaths {
owner, inner := trie.ResolvePath([]byte(path))
hash := addedHashes[i]
val := rawdb.ReadTrieNode(dstDb, owner, inner, hash, scheme)
if val == nil {
t.Error("missing trie node")
}
rawdb.DeleteTrieNode(dstDb, owner, inner, hash, scheme)
if err := checkStateConsistency(dstDb, scheme, srcRoot); err == nil {
t.Errorf("trie inconsistency not caught, missing: %v", path)
}
rawdb.WriteTrieNode(dstDb, owner, inner, hash, val, scheme)
}
}
func copyPreimages(srcDb, dstDb ethdb.Database) {
it := srcDb.NewIterator(rawdb.PreimagePrefix, nil)
defer it.Release()
preimages := make(map[common.Hash][]byte)
for it.Next() {
hash := it.Key()[len(rawdb.PreimagePrefix):]
preimages[common.BytesToHash(hash)] = common.CopyBytes(it.Value())
}
rawdb.WritePreimages(dstDb, preimages)
}