487 lines
18 KiB
Go
487 lines
18 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package snapshot
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import (
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"encoding/binary"
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"fmt"
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"math/big"
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"math/rand"
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"testing"
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"time"
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"github.com/VictoriaMetrics/fastcache"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// randomHash generates a random blob of data and returns it as a hash.
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func randomHash() common.Hash {
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var hash common.Hash
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if n, err := rand.Read(hash[:]); n != common.HashLength || err != nil {
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panic(err)
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}
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return hash
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}
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// randomAccount generates a random account and returns it RLP encoded.
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func randomAccount() []byte {
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root := randomHash()
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a := Account{
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Balance: big.NewInt(rand.Int63()),
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Nonce: rand.Uint64(),
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Root: root[:],
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CodeHash: emptyCode[:],
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}
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data, _ := rlp.EncodeToBytes(a)
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return data
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}
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// randomAccountSet generates a set of random accounts with the given strings as
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// the account address hashes.
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func randomAccountSet(hashes ...string) map[common.Hash][]byte {
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accounts := make(map[common.Hash][]byte)
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for _, hash := range hashes {
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accounts[common.HexToHash(hash)] = randomAccount()
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}
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return accounts
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}
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// randomStorageSet generates a set of random slots with the given strings as
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// the slot addresses.
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func randomStorageSet(accounts []string, hashes [][]string, nilStorage [][]string) map[common.Hash]map[common.Hash][]byte {
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storages := make(map[common.Hash]map[common.Hash][]byte)
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for index, account := range accounts {
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storages[common.HexToHash(account)] = make(map[common.Hash][]byte)
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if index < len(hashes) {
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hashes := hashes[index]
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for _, hash := range hashes {
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storages[common.HexToHash(account)][common.HexToHash(hash)] = randomHash().Bytes()
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}
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}
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if index < len(nilStorage) {
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nils := nilStorage[index]
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for _, hash := range nils {
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storages[common.HexToHash(account)][common.HexToHash(hash)] = nil
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}
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}
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}
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return storages
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}
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// Tests that if a disk layer becomes stale, no active external references will
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// be returned with junk data. This version of the test flattens every diff layer
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// to check internal corner case around the bottom-most memory accumulator.
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func TestDiskLayerExternalInvalidationFullFlatten(t *testing.T) {
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// Create an empty base layer and a snapshot tree out of it
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base := &diskLayer{
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diskdb: rawdb.NewMemoryDatabase(),
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root: common.HexToHash("0x01"),
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cache: fastcache.New(1024 * 500),
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}
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snaps := &Tree{
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layers: map[common.Hash]snapshot{
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base.root: base,
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},
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}
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// Retrieve a reference to the base and commit a diff on top
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ref := snaps.Snapshot(base.root)
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accounts := map[common.Hash][]byte{
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common.HexToHash("0xa1"): randomAccount(),
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}
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if err := snaps.Update(common.HexToHash("0x02"), common.HexToHash("0x01"), nil, accounts, nil); err != nil {
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t.Fatalf("failed to create a diff layer: %v", err)
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}
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if n := len(snaps.layers); n != 2 {
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t.Errorf("pre-cap layer count mismatch: have %d, want %d", n, 2)
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}
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// Commit the diff layer onto the disk and ensure it's persisted
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if err := snaps.Cap(common.HexToHash("0x02"), 0); err != nil {
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t.Fatalf("failed to merge diff layer onto disk: %v", err)
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}
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// Since the base layer was modified, ensure that data retrieval on the external reference fail
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if acc, err := ref.Account(common.HexToHash("0x01")); err != ErrSnapshotStale {
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t.Errorf("stale reference returned account: %#x (err: %v)", acc, err)
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}
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if slot, err := ref.Storage(common.HexToHash("0xa1"), common.HexToHash("0xb1")); err != ErrSnapshotStale {
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t.Errorf("stale reference returned storage slot: %#x (err: %v)", slot, err)
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}
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if n := len(snaps.layers); n != 1 {
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t.Errorf("post-cap layer count mismatch: have %d, want %d", n, 1)
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fmt.Println(snaps.layers)
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}
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}
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// Tests that if a disk layer becomes stale, no active external references will
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// be returned with junk data. This version of the test retains the bottom diff
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// layer to check the usual mode of operation where the accumulator is retained.
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func TestDiskLayerExternalInvalidationPartialFlatten(t *testing.T) {
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// Create an empty base layer and a snapshot tree out of it
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base := &diskLayer{
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diskdb: rawdb.NewMemoryDatabase(),
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root: common.HexToHash("0x01"),
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cache: fastcache.New(1024 * 500),
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}
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snaps := &Tree{
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layers: map[common.Hash]snapshot{
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base.root: base,
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},
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}
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// Retrieve a reference to the base and commit two diffs on top
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ref := snaps.Snapshot(base.root)
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accounts := map[common.Hash][]byte{
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common.HexToHash("0xa1"): randomAccount(),
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}
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if err := snaps.Update(common.HexToHash("0x02"), common.HexToHash("0x01"), nil, accounts, nil); err != nil {
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t.Fatalf("failed to create a diff layer: %v", err)
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}
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if err := snaps.Update(common.HexToHash("0x03"), common.HexToHash("0x02"), nil, accounts, nil); err != nil {
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t.Fatalf("failed to create a diff layer: %v", err)
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}
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if n := len(snaps.layers); n != 3 {
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t.Errorf("pre-cap layer count mismatch: have %d, want %d", n, 3)
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}
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// Commit the diff layer onto the disk and ensure it's persisted
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defer func(memcap uint64) { aggregatorMemoryLimit = memcap }(aggregatorMemoryLimit)
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aggregatorMemoryLimit = 0
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if err := snaps.Cap(common.HexToHash("0x03"), 1); err != nil {
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t.Fatalf("failed to merge accumulator onto disk: %v", err)
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}
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// Since the base layer was modified, ensure that data retrievals on the external reference fail
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if acc, err := ref.Account(common.HexToHash("0x01")); err != ErrSnapshotStale {
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t.Errorf("stale reference returned account: %#x (err: %v)", acc, err)
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}
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if slot, err := ref.Storage(common.HexToHash("0xa1"), common.HexToHash("0xb1")); err != ErrSnapshotStale {
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t.Errorf("stale reference returned storage slot: %#x (err: %v)", slot, err)
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}
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if n := len(snaps.layers); n != 2 {
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t.Errorf("post-cap layer count mismatch: have %d, want %d", n, 2)
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fmt.Println(snaps.layers)
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}
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}
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// Tests that if a diff layer becomes stale, no active external references will
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// be returned with junk data. This version of the test retains the bottom diff
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// layer to check the usual mode of operation where the accumulator is retained.
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func TestDiffLayerExternalInvalidationPartialFlatten(t *testing.T) {
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// Create an empty base layer and a snapshot tree out of it
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base := &diskLayer{
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diskdb: rawdb.NewMemoryDatabase(),
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root: common.HexToHash("0x01"),
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cache: fastcache.New(1024 * 500),
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}
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snaps := &Tree{
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layers: map[common.Hash]snapshot{
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base.root: base,
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},
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}
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// Commit three diffs on top and retrieve a reference to the bottommost
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accounts := map[common.Hash][]byte{
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common.HexToHash("0xa1"): randomAccount(),
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}
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if err := snaps.Update(common.HexToHash("0x02"), common.HexToHash("0x01"), nil, accounts, nil); err != nil {
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t.Fatalf("failed to create a diff layer: %v", err)
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}
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if err := snaps.Update(common.HexToHash("0x03"), common.HexToHash("0x02"), nil, accounts, nil); err != nil {
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t.Fatalf("failed to create a diff layer: %v", err)
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}
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if err := snaps.Update(common.HexToHash("0x04"), common.HexToHash("0x03"), nil, accounts, nil); err != nil {
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t.Fatalf("failed to create a diff layer: %v", err)
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}
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if n := len(snaps.layers); n != 4 {
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t.Errorf("pre-cap layer count mismatch: have %d, want %d", n, 4)
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}
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ref := snaps.Snapshot(common.HexToHash("0x02"))
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// Doing a Cap operation with many allowed layers should be a no-op
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exp := len(snaps.layers)
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if err := snaps.Cap(common.HexToHash("0x04"), 2000); err != nil {
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t.Fatalf("failed to flatten diff layer into accumulator: %v", err)
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}
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if got := len(snaps.layers); got != exp {
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t.Errorf("layers modified, got %d exp %d", got, exp)
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}
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// Flatten the diff layer into the bottom accumulator
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if err := snaps.Cap(common.HexToHash("0x04"), 1); err != nil {
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t.Fatalf("failed to flatten diff layer into accumulator: %v", err)
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}
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// Since the accumulator diff layer was modified, ensure that data retrievals on the external reference fail
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if acc, err := ref.Account(common.HexToHash("0x01")); err != ErrSnapshotStale {
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t.Errorf("stale reference returned account: %#x (err: %v)", acc, err)
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}
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if slot, err := ref.Storage(common.HexToHash("0xa1"), common.HexToHash("0xb1")); err != ErrSnapshotStale {
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t.Errorf("stale reference returned storage slot: %#x (err: %v)", slot, err)
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}
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if n := len(snaps.layers); n != 3 {
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t.Errorf("post-cap layer count mismatch: have %d, want %d", n, 3)
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fmt.Println(snaps.layers)
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}
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}
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// TestPostCapBasicDataAccess tests some functionality regarding capping/flattening.
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func TestPostCapBasicDataAccess(t *testing.T) {
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// setAccount is a helper to construct a random account entry and assign it to
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// an account slot in a snapshot
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setAccount := func(accKey string) map[common.Hash][]byte {
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return map[common.Hash][]byte{
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common.HexToHash(accKey): randomAccount(),
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}
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}
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// Create a starting base layer and a snapshot tree out of it
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base := &diskLayer{
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diskdb: rawdb.NewMemoryDatabase(),
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root: common.HexToHash("0x01"),
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cache: fastcache.New(1024 * 500),
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}
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snaps := &Tree{
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layers: map[common.Hash]snapshot{
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base.root: base,
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},
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}
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// The lowest difflayer
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snaps.Update(common.HexToHash("0xa1"), common.HexToHash("0x01"), nil, setAccount("0xa1"), nil)
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snaps.Update(common.HexToHash("0xa2"), common.HexToHash("0xa1"), nil, setAccount("0xa2"), nil)
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snaps.Update(common.HexToHash("0xb2"), common.HexToHash("0xa1"), nil, setAccount("0xb2"), nil)
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snaps.Update(common.HexToHash("0xa3"), common.HexToHash("0xa2"), nil, setAccount("0xa3"), nil)
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snaps.Update(common.HexToHash("0xb3"), common.HexToHash("0xb2"), nil, setAccount("0xb3"), nil)
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// checkExist verifies if an account exists in a snapshot
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checkExist := func(layer *diffLayer, key string) error {
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if data, _ := layer.Account(common.HexToHash(key)); data == nil {
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return fmt.Errorf("expected %x to exist, got nil", common.HexToHash(key))
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}
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return nil
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}
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// shouldErr checks that an account access errors as expected
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shouldErr := func(layer *diffLayer, key string) error {
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if data, err := layer.Account(common.HexToHash(key)); err == nil {
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return fmt.Errorf("expected error, got data %x", data)
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}
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return nil
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}
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// check basics
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snap := snaps.Snapshot(common.HexToHash("0xb3")).(*diffLayer)
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if err := checkExist(snap, "0xa1"); err != nil {
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t.Error(err)
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}
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if err := checkExist(snap, "0xb2"); err != nil {
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t.Error(err)
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}
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if err := checkExist(snap, "0xb3"); err != nil {
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t.Error(err)
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}
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// Cap to a bad root should fail
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if err := snaps.Cap(common.HexToHash("0x1337"), 0); err == nil {
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t.Errorf("expected error, got none")
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}
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// Now, merge the a-chain
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snaps.Cap(common.HexToHash("0xa3"), 0)
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// At this point, a2 got merged into a1. Thus, a1 is now modified, and as a1 is
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// the parent of b2, b2 should no longer be able to iterate into parent.
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// These should still be accessible
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if err := checkExist(snap, "0xb2"); err != nil {
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t.Error(err)
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}
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if err := checkExist(snap, "0xb3"); err != nil {
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t.Error(err)
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}
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// But these would need iteration into the modified parent
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if err := shouldErr(snap, "0xa1"); err != nil {
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t.Error(err)
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}
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if err := shouldErr(snap, "0xa2"); err != nil {
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t.Error(err)
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}
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if err := shouldErr(snap, "0xa3"); err != nil {
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t.Error(err)
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}
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// Now, merge it again, just for fun. It should now error, since a3
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// is a disk layer
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if err := snaps.Cap(common.HexToHash("0xa3"), 0); err == nil {
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t.Error("expected error capping the disk layer, got none")
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}
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}
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// TestSnaphots tests the functionality for retrieving the snapshot
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// with given head root and the desired depth.
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func TestSnaphots(t *testing.T) {
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// setAccount is a helper to construct a random account entry and assign it to
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// an account slot in a snapshot
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setAccount := func(accKey string) map[common.Hash][]byte {
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return map[common.Hash][]byte{
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common.HexToHash(accKey): randomAccount(),
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}
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}
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makeRoot := func(height uint64) common.Hash {
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var buffer [8]byte
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binary.BigEndian.PutUint64(buffer[:], height)
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return common.BytesToHash(buffer[:])
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}
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// Create a starting base layer and a snapshot tree out of it
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base := &diskLayer{
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diskdb: rawdb.NewMemoryDatabase(),
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root: makeRoot(1),
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cache: fastcache.New(1024 * 500),
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}
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snaps := &Tree{
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layers: map[common.Hash]snapshot{
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base.root: base,
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},
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}
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// Construct the snapshots with 129 layers, flattening whatever's above that
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var (
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last = common.HexToHash("0x01")
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head common.Hash
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)
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for i := 0; i < 129; i++ {
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head = makeRoot(uint64(i + 2))
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snaps.Update(head, last, nil, setAccount(fmt.Sprintf("%d", i+2)), nil)
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last = head
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snaps.Cap(head, 128) // 130 layers (128 diffs + 1 accumulator + 1 disk)
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}
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var cases = []struct {
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headRoot common.Hash
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limit int
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nodisk bool
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expected int
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expectBottom common.Hash
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}{
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{head, 0, false, 0, common.Hash{}},
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{head, 64, false, 64, makeRoot(129 + 2 - 64)},
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{head, 128, false, 128, makeRoot(3)}, // Normal diff layers, no accumulator
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{head, 129, true, 129, makeRoot(2)}, // All diff layers, including accumulator
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{head, 130, false, 130, makeRoot(1)}, // All diff layers + disk layer
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}
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for i, c := range cases {
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layers := snaps.Snapshots(c.headRoot, c.limit, c.nodisk)
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if len(layers) != c.expected {
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t.Errorf("non-overflow test %d: returned snapshot layers are mismatched, want %v, got %v", i, c.expected, len(layers))
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}
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if len(layers) == 0 {
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continue
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}
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bottommost := layers[len(layers)-1]
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if bottommost.Root() != c.expectBottom {
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t.Errorf("non-overflow test %d: snapshot mismatch, want %v, get %v", i, c.expectBottom, bottommost.Root())
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}
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}
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// Above we've tested the normal capping, which leaves the accumulator live.
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// Test that if the bottommost accumulator diff layer overflows the allowed
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// memory limit, the snapshot tree gets capped to one less layer.
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// Commit the diff layer onto the disk and ensure it's persisted
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defer func(memcap uint64) { aggregatorMemoryLimit = memcap }(aggregatorMemoryLimit)
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aggregatorMemoryLimit = 0
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snaps.Cap(head, 128) // 129 (128 diffs + 1 overflown accumulator + 1 disk)
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cases = []struct {
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headRoot common.Hash
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limit int
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nodisk bool
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expected int
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expectBottom common.Hash
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}{
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{head, 0, false, 0, common.Hash{}},
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{head, 64, false, 64, makeRoot(129 + 2 - 64)},
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{head, 128, false, 128, makeRoot(3)}, // All diff layers, accumulator was flattened
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{head, 129, true, 128, makeRoot(3)}, // All diff layers, accumulator was flattened
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{head, 130, false, 129, makeRoot(2)}, // All diff layers + disk layer
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}
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for i, c := range cases {
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layers := snaps.Snapshots(c.headRoot, c.limit, c.nodisk)
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if len(layers) != c.expected {
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t.Errorf("overflow test %d: returned snapshot layers are mismatched, want %v, got %v", i, c.expected, len(layers))
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}
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if len(layers) == 0 {
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continue
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}
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bottommost := layers[len(layers)-1]
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if bottommost.Root() != c.expectBottom {
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t.Errorf("overflow test %d: snapshot mismatch, want %v, get %v", i, c.expectBottom, bottommost.Root())
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}
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}
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}
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// TestReadStateDuringFlattening tests the scenario that, during the
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// bottom diff layers are merging which tags these as stale, the read
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// happens via a pre-created top snapshot layer which tries to access
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// the state in these stale layers. Ensure this read can retrieve the
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// right state back(block until the flattening is finished) instead of
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// an unexpected error(snapshot layer is stale).
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func TestReadStateDuringFlattening(t *testing.T) {
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// setAccount is a helper to construct a random account entry and assign it to
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// an account slot in a snapshot
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setAccount := func(accKey string) map[common.Hash][]byte {
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return map[common.Hash][]byte{
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common.HexToHash(accKey): randomAccount(),
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}
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}
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// Create a starting base layer and a snapshot tree out of it
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base := &diskLayer{
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diskdb: rawdb.NewMemoryDatabase(),
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|
root: common.HexToHash("0x01"),
|
|
cache: fastcache.New(1024 * 500),
|
|
}
|
|
snaps := &Tree{
|
|
layers: map[common.Hash]snapshot{
|
|
base.root: base,
|
|
},
|
|
}
|
|
// 4 layers in total, 3 diff layers and 1 disk layers
|
|
snaps.Update(common.HexToHash("0xa1"), common.HexToHash("0x01"), nil, setAccount("0xa1"), nil)
|
|
snaps.Update(common.HexToHash("0xa2"), common.HexToHash("0xa1"), nil, setAccount("0xa2"), nil)
|
|
snaps.Update(common.HexToHash("0xa3"), common.HexToHash("0xa2"), nil, setAccount("0xa3"), nil)
|
|
|
|
// Obtain the topmost snapshot handler for state accessing
|
|
snap := snaps.Snapshot(common.HexToHash("0xa3"))
|
|
|
|
// Register the testing hook to access the state after flattening
|
|
var result = make(chan *Account)
|
|
snaps.onFlatten = func() {
|
|
// Spin up a thread to read the account from the pre-created
|
|
// snapshot handler. It's expected to be blocked.
|
|
go func() {
|
|
account, _ := snap.Account(common.HexToHash("0xa1"))
|
|
result <- account
|
|
}()
|
|
select {
|
|
case res := <-result:
|
|
t.Fatalf("Unexpected return %v", res)
|
|
case <-time.NewTimer(time.Millisecond * 300).C:
|
|
}
|
|
}
|
|
// Cap the snap tree, which will mark the bottom-most layer as stale.
|
|
snaps.Cap(common.HexToHash("0xa3"), 1)
|
|
select {
|
|
case account := <-result:
|
|
if account == nil {
|
|
t.Fatal("Failed to retrieve account")
|
|
}
|
|
case <-time.NewTimer(time.Millisecond * 300).C:
|
|
t.Fatal("Unexpected blocker")
|
|
}
|
|
}
|