318 lines
12 KiB
Go
318 lines
12 KiB
Go
// Copyright 2019 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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"fmt"
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"testing"
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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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)
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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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storage := make(map[common.Hash]map[common.Hash][]byte)
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if err := snaps.Update(common.HexToHash("0x02"), common.HexToHash("0x01"), accounts, storage); 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 retrievald 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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storage := make(map[common.Hash]map[common.Hash][]byte)
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if err := snaps.Update(common.HexToHash("0x02"), common.HexToHash("0x01"), accounts, storage); 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"), accounts, storage); 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"), 2); 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 retrievald 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 flattens every diff layer
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// to check internal corner case around the bottom-most memory accumulator.
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func TestDiffLayerExternalInvalidationFullFlatten(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 two 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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storage := make(map[common.Hash]map[common.Hash][]byte)
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if err := snaps.Update(common.HexToHash("0x02"), common.HexToHash("0x01"), accounts, storage); 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"), accounts, storage); 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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ref := snaps.Snapshot(common.HexToHash("0x02"))
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// Flatten the diff layer into the bottom accumulator
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if err := snaps.Cap(common.HexToHash("0x03"), 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 retrievald 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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storage := make(map[common.Hash]map[common.Hash][]byte)
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if err := snaps.Update(common.HexToHash("0x02"), common.HexToHash("0x01"), accounts, storage); 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"), accounts, storage); 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"), accounts, storage); 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"), 2); 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 retrievald 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"), setAccount("0xa1"), nil)
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snaps.Update(common.HexToHash("0xa2"), common.HexToHash("0xa1"), setAccount("0xa2"), nil)
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snaps.Update(common.HexToHash("0xb2"), common.HexToHash("0xa1"), setAccount("0xb2"), nil)
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snaps.Update(common.HexToHash("0xa3"), common.HexToHash("0xa2"), setAccount("0xa3"), nil)
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snaps.Update(common.HexToHash("0xb3"), common.HexToHash("0xb2"), setAccount("0xb3"), nil)
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// checkExist verifies if an account exiss 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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