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core: nuke legacy snapshot supporting (#22663)

This commit is contained in:
gary rong 2021-04-20 13:27:46 +08:00 committed by GitHub
parent 653b7e959d
commit d6ffa14035
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 12 additions and 472 deletions
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15
core/blockchain.go
View File

@ -207,9 +207,8 @@ type BlockChain struct {
processor Processor // Block transaction processor interface processor Processor // Block transaction processor interface
vmConfig vm.Config vmConfig vm.Config
shouldPreserve func(*types.Block) bool // Function used to determine whether should preserve the given block. shouldPreserve func(*types.Block) bool // Function used to determine whether should preserve the given block.
terminateInsert func(common.Hash, uint64) bool // Testing hook used to terminate ancient receipt chain insertion. terminateInsert func(common.Hash, uint64) bool // Testing hook used to terminate ancient receipt chain insertion.
writeLegacyJournal bool // Testing flag used to flush the snapshot journal in legacy format.
} }
// NewBlockChain returns a fully initialised block chain using information // NewBlockChain returns a fully initialised block chain using information
@ -1002,14 +1001,8 @@ func (bc *BlockChain) Stop() {
var snapBase common.Hash var snapBase common.Hash
if bc.snaps != nil { if bc.snaps != nil {
var err error var err error
if bc.writeLegacyJournal { if snapBase, err = bc.snaps.Journal(bc.CurrentBlock().Root()); err != nil {
if snapBase, err = bc.snaps.LegacyJournal(bc.CurrentBlock().Root()); err != nil { log.Error("Failed to journal state snapshot", "err", err)
log.Error("Failed to journal state snapshot", "err", err)
}
} else {
if snapBase, err = bc.snaps.Journal(bc.CurrentBlock().Root()); err != nil {
log.Error("Failed to journal state snapshot", "err", err)
}
} }
} }
// Ensure the state of a recent block is also stored to disk before exiting. // Ensure the state of a recent block is also stored to disk before exiting.

320
core/blockchain_snapshot_test.go
View File

@ -39,7 +39,6 @@ import (
// snapshotTestBasic wraps the common testing fields in the snapshot tests. // snapshotTestBasic wraps the common testing fields in the snapshot tests.
type snapshotTestBasic struct { type snapshotTestBasic struct {
legacy bool // Wether write the snapshot journal in legacy format
chainBlocks int // Number of blocks to generate for the canonical chain chainBlocks int // Number of blocks to generate for the canonical chain
snapshotBlock uint64 // Block number of the relevant snapshot disk layer snapshotBlock uint64 // Block number of the relevant snapshot disk layer
commitBlock uint64 // Block number for which to commit the state to disk commitBlock uint64 // Block number for which to commit the state to disk
@ -104,19 +103,13 @@ func (basic *snapshotTestBasic) prepare(t *testing.T) (*BlockChain, []*types.Blo
chain.stateCache.TrieDB().Commit(blocks[point-1].Root(), true, nil) chain.stateCache.TrieDB().Commit(blocks[point-1].Root(), true, nil)
} }
if basic.snapshotBlock > 0 && basic.snapshotBlock == point { if basic.snapshotBlock > 0 && basic.snapshotBlock == point {
if basic.legacy { // Flushing the entire snap tree into the disk, the
// Here we commit the snapshot disk root to simulate // relavant (a) snapshot root and (b) snapshot generator
// committing the legacy snapshot. // will be persisted atomically.
rawdb.WriteSnapshotRoot(db, blocks[point-1].Root()) chain.snaps.Cap(blocks[point-1].Root(), 0)
} else { diskRoot, blockRoot := chain.snaps.DiskRoot(), blocks[point-1].Root()
// Flushing the entire snap tree into the disk, the if !bytes.Equal(diskRoot.Bytes(), blockRoot.Bytes()) {
// relavant (a) snapshot root and (b) snapshot generator t.Fatalf("Failed to flush disk layer change, want %x, got %x", blockRoot, diskRoot)
// will be persisted atomically.
chain.snaps.Cap(blocks[point-1].Root(), 0)
diskRoot, blockRoot := chain.snaps.DiskRoot(), blocks[point-1].Root()
if !bytes.Equal(diskRoot.Bytes(), blockRoot.Bytes()) {
t.Fatalf("Failed to flush disk layer change, want %x, got %x", blockRoot, diskRoot)
}
} }
} }
} }
@ -129,12 +122,6 @@ func (basic *snapshotTestBasic) prepare(t *testing.T) (*BlockChain, []*types.Blo
basic.db = db basic.db = db
basic.gendb = gendb basic.gendb = gendb
basic.engine = engine basic.engine = engine
// Ugly hack, notify the chain to flush the journal in legacy format
// if it's requested.
if basic.legacy {
chain.writeLegacyJournal = true
}
return chain, blocks return chain, blocks
} }
@ -484,46 +471,6 @@ func TestRestartWithNewSnapshot(t *testing.T) {
// Expected snapshot disk : G // Expected snapshot disk : G
test := &snapshotTest{ test := &snapshotTest{
snapshotTestBasic{ snapshotTestBasic{
legacy: false,
chainBlocks: 8,
snapshotBlock: 0,
commitBlock: 0,
expCanonicalBlocks: 8,
expHeadHeader: 8,
expHeadFastBlock: 8,
expHeadBlock: 8,
expSnapshotBottom: 0, // Initial disk layer built from genesis
},
}
test.test(t)
test.teardown()
}
// Tests a Geth restart with valid but "legacy" snapshot. Before the shutdown,
// all snapshot journal will be persisted correctly. In this case no snapshot
// recovery is required.
func TestRestartWithLegacySnapshot(t *testing.T) {
// Chain:
// G->C1->C2->C3->C4->C5->C6->C7->C8 (HEAD)
//
// Commit: G
// Snapshot: G
//
// SetHead(0)
//
// ------------------------------
//
// Expected in leveldb:
// G->C1->C2->C3->C4->C5->C6->C7->C8
//
// Expected head header : C8
// Expected head fast block: C8
// Expected head block : C8
// Expected snapshot disk : G
t.Skip("Legacy format testing is not supported")
test := &snapshotTest{
snapshotTestBasic{
legacy: true,
chainBlocks: 8, chainBlocks: 8,
snapshotBlock: 0, snapshotBlock: 0,
commitBlock: 0, commitBlock: 0,
@ -563,7 +510,6 @@ func TestNoCommitCrashWithNewSnapshot(t *testing.T) {
// Expected snapshot disk : C4 // Expected snapshot disk : C4
test := &crashSnapshotTest{ test := &crashSnapshotTest{
snapshotTestBasic{ snapshotTestBasic{
legacy: false,
chainBlocks: 8, chainBlocks: 8,
snapshotBlock: 4, snapshotBlock: 4,
commitBlock: 0, commitBlock: 0,
@ -603,7 +549,6 @@ func TestLowCommitCrashWithNewSnapshot(t *testing.T) {
// Expected snapshot disk : C4 // Expected snapshot disk : C4
test := &crashSnapshotTest{ test := &crashSnapshotTest{
snapshotTestBasic{ snapshotTestBasic{
legacy: false,
chainBlocks: 8, chainBlocks: 8,
snapshotBlock: 4, snapshotBlock: 4,
commitBlock: 2, commitBlock: 2,
@ -643,7 +588,6 @@ func TestHighCommitCrashWithNewSnapshot(t *testing.T) {
// Expected snapshot disk : C4 // Expected snapshot disk : C4
test := &crashSnapshotTest{ test := &crashSnapshotTest{
snapshotTestBasic{ snapshotTestBasic{
legacy: false,
chainBlocks: 8, chainBlocks: 8,
snapshotBlock: 4, snapshotBlock: 4,
commitBlock: 6, commitBlock: 6,
@ -658,131 +602,6 @@ func TestHighCommitCrashWithNewSnapshot(t *testing.T) {
test.teardown() test.teardown()
} }
// Tests a Geth was crashed and restarts with a broken and "legacy format"
// snapshot. In this case the entire legacy snapshot should be discared
// and rebuild from the new chain head. The new head here refers to the
// genesis because there is no committed point.
func TestNoCommitCrashWithLegacySnapshot(t *testing.T) {
// Chain:
// G->C1->C2->C3->C4->C5->C6->C7->C8 (HEAD)
//
// Commit: G
// Snapshot: G, C4
//
// CRASH
//
// ------------------------------
//
// Expected in leveldb:
// G->C1->C2->C3->C4->C5->C6->C7->C8
//
// Expected head header : C8
// Expected head fast block: C8
// Expected head block : G
// Expected snapshot disk : G
t.Skip("Legacy format testing is not supported")
test := &crashSnapshotTest{
snapshotTestBasic{
legacy: true,
chainBlocks: 8,
snapshotBlock: 4,
commitBlock: 0,
expCanonicalBlocks: 8,
expHeadHeader: 8,
expHeadFastBlock: 8,
expHeadBlock: 0,
expSnapshotBottom: 0, // Rebuilt snapshot from the latest HEAD(genesis)
},
}
test.test(t)
test.teardown()
}
// Tests a Geth was crashed and restarts with a broken and "legacy format"
// snapshot. In this case the entire legacy snapshot should be discared
// and rebuild from the new chain head. The new head here refers to the
// block-2 because it's committed into the disk.
func TestLowCommitCrashWithLegacySnapshot(t *testing.T) {
// Chain:
// G->C1->C2->C3->C4->C5->C6->C7->C8 (HEAD)
//
// Commit: G, C2
// Snapshot: G, C4
//
// CRASH
//
// ------------------------------
//
// Expected in leveldb:
// G->C1->C2->C3->C4->C5->C6->C7->C8
//
// Expected head header : C8
// Expected head fast block: C8
// Expected head block : C2
// Expected snapshot disk : C2
t.Skip("Legacy format testing is not supported")
test := &crashSnapshotTest{
snapshotTestBasic{
legacy: true,
chainBlocks: 8,
snapshotBlock: 4,
commitBlock: 2,
expCanonicalBlocks: 8,
expHeadHeader: 8,
expHeadFastBlock: 8,
expHeadBlock: 2,
expSnapshotBottom: 2, // Rebuilt snapshot from the latest HEAD
},
}
test.test(t)
test.teardown()
}
// Tests a Geth was crashed and restarts with a broken and "legacy format"
// snapshot. In this case the entire legacy snapshot should be discared
// and rebuild from the new chain head.
//
// The new head here refers to the the genesis, the reason is:
// - the state of block-6 is committed into the disk
// - the legacy disk layer of block-4 is committed into the disk
// - the head is rewound the genesis in order to find an available
// state lower than disk layer
func TestHighCommitCrashWithLegacySnapshot(t *testing.T) {
// Chain:
// G->C1->C2->C3->C4->C5->C6->C7->C8 (HEAD)
//
// Commit: G, C6
// Snapshot: G, C4
//
// CRASH
//
// ------------------------------
//
// Expected in leveldb:
// G->C1->C2->C3->C4->C5->C6->C7->C8
//
// Expected head header : C8
// Expected head fast block: C8
// Expected head block : G
// Expected snapshot disk : G
t.Skip("Legacy format testing is not supported")
test := &crashSnapshotTest{
snapshotTestBasic{
legacy: true,
chainBlocks: 8,
snapshotBlock: 4,
commitBlock: 6,
expCanonicalBlocks: 8,
expHeadHeader: 8,
expHeadFastBlock: 8,
expHeadBlock: 0,
expSnapshotBottom: 0, // Rebuilt snapshot from the latest HEAD(genesis)
},
}
test.test(t)
test.teardown()
}
// Tests a Geth was running with snapshot enabled. Then restarts without // Tests a Geth was running with snapshot enabled. Then restarts without
// enabling snapshot and after that re-enable the snapshot again. In this // enabling snapshot and after that re-enable the snapshot again. In this
// case the snapshot should be rebuilt with latest chain head. // case the snapshot should be rebuilt with latest chain head.
@ -806,47 +625,6 @@ func TestGappedNewSnapshot(t *testing.T) {
// Expected snapshot disk : C10 // Expected snapshot disk : C10
test := &gappedSnapshotTest{ test := &gappedSnapshotTest{
snapshotTestBasic: snapshotTestBasic{ snapshotTestBasic: snapshotTestBasic{
legacy: false,
chainBlocks: 8,
snapshotBlock: 0,
commitBlock: 0,
expCanonicalBlocks: 10,
expHeadHeader: 10,
expHeadFastBlock: 10,
expHeadBlock: 10,
expSnapshotBottom: 10, // Rebuilt snapshot from the latest HEAD
},
gapped: 2,
}
test.test(t)
test.teardown()
}
// Tests a Geth was running with leagcy snapshot enabled. Then restarts
// without enabling snapshot and after that re-enable the snapshot again.
// In this case the snapshot should be rebuilt with latest chain head.
func TestGappedLegacySnapshot(t *testing.T) {
// Chain:
// G->C1->C2->C3->C4->C5->C6->C7->C8 (HEAD)
//
// Commit: G
// Snapshot: G
//
// SetHead(0)
//
// ------------------------------
//
// Expected in leveldb:
// G->C1->C2->C3->C4->C5->C6->C7->C8->C9->C10
//
// Expected head header : C10
// Expected head fast block: C10
// Expected head block : C10
// Expected snapshot disk : C10
t.Skip("Legacy format testing is not supported")
test := &gappedSnapshotTest{
snapshotTestBasic: snapshotTestBasic{
legacy: true,
chainBlocks: 8, chainBlocks: 8,
snapshotBlock: 0, snapshotBlock: 0,
commitBlock: 0, commitBlock: 0,
@ -885,7 +663,6 @@ func TestSetHeadWithNewSnapshot(t *testing.T) {
// Expected snapshot disk : G // Expected snapshot disk : G
test := &setHeadSnapshotTest{ test := &setHeadSnapshotTest{
snapshotTestBasic: snapshotTestBasic{ snapshotTestBasic: snapshotTestBasic{
legacy: false,
chainBlocks: 8, chainBlocks: 8,
snapshotBlock: 0, snapshotBlock: 0,
commitBlock: 0, commitBlock: 0,
@ -901,88 +678,6 @@ func TestSetHeadWithNewSnapshot(t *testing.T) {
test.teardown() test.teardown()
} }
// Tests the Geth was running with snapshot(legacy-format) enabled and resetHead
// is applied. In this case the head is rewound to the target(with state available).
// After that the chain is restarted and the original disk layer is kept.
func TestSetHeadWithLegacySnapshot(t *testing.T) {
// Chain:
// G->C1->C2->C3->C4->C5->C6->C7->C8 (HEAD)
//
// Commit: G
// Snapshot: G
//
// SetHead(4)
//
// ------------------------------
//
// Expected in leveldb:
// G->C1->C2->C3->C4
//
// Expected head header : C4
// Expected head fast block: C4
// Expected head block : C4
// Expected snapshot disk : G
t.Skip("Legacy format testing is not supported")
test := &setHeadSnapshotTest{
snapshotTestBasic: snapshotTestBasic{
legacy: true,
chainBlocks: 8,
snapshotBlock: 0,
commitBlock: 0,
expCanonicalBlocks: 4,
expHeadHeader: 4,
expHeadFastBlock: 4,
expHeadBlock: 4,
expSnapshotBottom: 0, // The initial disk layer is built from the genesis
},
setHead: 4,
}
test.test(t)
test.teardown()
}
// Tests the Geth was running with snapshot(legacy-format) enabled and upgrades
// the disk layer journal(journal generator) to latest format. After that the Geth
// is restarted from a crash. In this case Geth will find the new-format disk layer
// journal but with legacy-format diff journal(the new-format is never committed),
// and the invalid diff journal is expected to be dropped.
func TestRecoverSnapshotFromCrashWithLegacyDiffJournal(t *testing.T) {
// Chain:
// G->C1->C2->C3->C4->C5->C6->C7->C8 (HEAD)
//
// Commit: G
// Snapshot: G
//
// SetHead(0)
//
// ------------------------------
//
// Expected in leveldb:
// G->C1->C2->C3->C4->C5->C6->C7->C8->C9->C10
//
// Expected head header : C10
// Expected head fast block: C10
// Expected head block : C8
// Expected snapshot disk : C10
t.Skip("Legacy format testing is not supported")
test := &restartCrashSnapshotTest{
snapshotTestBasic: snapshotTestBasic{
legacy: true,
chainBlocks: 8,
snapshotBlock: 0,
commitBlock: 0,
expCanonicalBlocks: 10,
expHeadHeader: 10,
expHeadFastBlock: 10,
expHeadBlock: 8, // The persisted state in the first running
expSnapshotBottom: 10, // The persisted disk layer in the second running
},
newBlocks: 2,
}
test.test(t)
test.teardown()
}
// Tests the Geth was running with a complete snapshot and then imports a few // Tests the Geth was running with a complete snapshot and then imports a few
// more new blocks on top without enabling the snapshot. After the restart, // more new blocks on top without enabling the snapshot. After the restart,
// crash happens. Check everything is ok after the restart. // crash happens. Check everything is ok after the restart.
@ -1006,7 +701,6 @@ func TestRecoverSnapshotFromWipingCrash(t *testing.T) {
// Expected snapshot disk : C10 // Expected snapshot disk : C10
test := &wipeCrashSnapshotTest{ test := &wipeCrashSnapshotTest{
snapshotTestBasic: snapshotTestBasic{ snapshotTestBasic: snapshotTestBasic{
legacy: false,
chainBlocks: 8, chainBlocks: 8,
snapshotBlock: 4, snapshotBlock: 4,
commitBlock: 0, commitBlock: 0,

122
core/state/snapshot/journal.go
View File

@ -66,30 +66,6 @@ type journalStorage struct {
Vals [][]byte Vals [][]byte
} }
// loadAndParseLegacyJournal tries to parse the snapshot journal in legacy format.
func loadAndParseLegacyJournal(db ethdb.KeyValueStore, base *diskLayer) (snapshot, journalGenerator, error) {
// Retrieve the journal, for legacy journal it must exist since even for
// 0 layer it stores whether we've already generated the snapshot or are
// in progress only.
journal := rawdb.ReadSnapshotJournal(db)
if len(journal) == 0 {
return nil, journalGenerator{}, errors.New("missing or corrupted snapshot journal")
}
r := rlp.NewStream(bytes.NewReader(journal), 0)
// Read the snapshot generation progress for the disk layer
var generator journalGenerator
if err := r.Decode(&generator); err != nil {
return nil, journalGenerator{}, fmt.Errorf("failed to load snapshot progress marker: %v", err)
}
// Load all the snapshot diffs from the journal
snapshot, err := loadDiffLayer(base, r)
if err != nil {
return nil, generator, err
}
return snapshot, generator, nil
}
// loadAndParseJournal tries to parse the snapshot journal in latest format. // loadAndParseJournal tries to parse the snapshot journal in latest format.
func loadAndParseJournal(db ethdb.KeyValueStore, base *diskLayer) (snapshot, journalGenerator, error) { func loadAndParseJournal(db ethdb.KeyValueStore, base *diskLayer) (snapshot, journalGenerator, error) {
// Retrieve the disk layer generator. It must exist, no matter the // Retrieve the disk layer generator. It must exist, no matter the
@ -163,14 +139,9 @@ func loadSnapshot(diskdb ethdb.KeyValueStore, triedb *trie.Database, cache int,
cache: fastcache.New(cache * 1024 * 1024), cache: fastcache.New(cache * 1024 * 1024),
root: baseRoot, root: baseRoot,
} }
var legacy bool
snapshot, generator, err := loadAndParseJournal(diskdb, base) snapshot, generator, err := loadAndParseJournal(diskdb, base)
if err != nil { if err != nil {
log.Warn("Failed to load new-format journal", "error", err) log.Warn("Failed to load new-format journal", "error", err)
snapshot, generator, err = loadAndParseLegacyJournal(diskdb, base)
legacy = true
}
if err != nil {
return nil, err return nil, err
} }
// Entire snapshot journal loaded, sanity check the head. If the loaded // Entire snapshot journal loaded, sanity check the head. If the loaded
@ -185,7 +156,7 @@ func loadSnapshot(diskdb ethdb.KeyValueStore, triedb *trie.Database, cache int,
// If it's legacy snapshot, or it's new-format snapshot but // If it's legacy snapshot, or it's new-format snapshot but
// it's not in recovery mode, returns the error here for // it's not in recovery mode, returns the error here for
// rebuilding the entire snapshot forcibly. // rebuilding the entire snapshot forcibly.
if legacy || !recovery { if !recovery {
return nil, fmt.Errorf("head doesn't match snapshot: have %#x, want %#x", head, root) return nil, fmt.Errorf("head doesn't match snapshot: have %#x, want %#x", head, root)
} }
// It's in snapshot recovery, the assumption is held that // It's in snapshot recovery, the assumption is held that
@ -346,94 +317,3 @@ func (dl *diffLayer) Journal(buffer *bytes.Buffer) (common.Hash, error) {
log.Debug("Journalled diff layer", "root", dl.root, "parent", dl.parent.Root()) log.Debug("Journalled diff layer", "root", dl.root, "parent", dl.parent.Root())
return base, nil return base, nil
} }
// LegacyJournal writes the persistent layer generator stats into a buffer
// to be stored in the database as the snapshot journal.
//
// Note it's the legacy version which is only used in testing right now.
func (dl *diskLayer) LegacyJournal(buffer *bytes.Buffer) (common.Hash, error) {
// If the snapshot is currently being generated, abort it
var stats *generatorStats
if dl.genAbort != nil {
abort := make(chan *generatorStats)
dl.genAbort <- abort
if stats = <-abort; stats != nil {
stats.Log("Journalling in-progress snapshot", dl.root, dl.genMarker)
}
}
// Ensure the layer didn't get stale
dl.lock.RLock()
defer dl.lock.RUnlock()
if dl.stale {
return common.Hash{}, ErrSnapshotStale
}
// Write out the generator marker
entry := journalGenerator{
Done: dl.genMarker == nil,
Marker: dl.genMarker,
}
if stats != nil {
entry.Accounts = stats.accounts
entry.Slots = stats.slots
entry.Storage = uint64(stats.storage)
}
log.Debug("Legacy journalled disk layer", "root", dl.root)
if err := rlp.Encode(buffer, entry); err != nil {
return common.Hash{}, err
}
return dl.root, nil
}
// Journal writes the memory layer contents into a buffer to be stored in the
// database as the snapshot journal.
//
// Note it's the legacy version which is only used in testing right now.
func (dl *diffLayer) LegacyJournal(buffer *bytes.Buffer) (common.Hash, error) {
// Journal the parent first
base, err := dl.parent.LegacyJournal(buffer)
if err != nil {
return common.Hash{}, err
}
// Ensure the layer didn't get stale
dl.lock.RLock()
defer dl.lock.RUnlock()
if dl.Stale() {
return common.Hash{}, ErrSnapshotStale
}
// Everything below was journalled, persist this layer too
if err := rlp.Encode(buffer, dl.root); err != nil {
return common.Hash{}, err
}
destructs := make([]journalDestruct, 0, len(dl.destructSet))
for hash := range dl.destructSet {
destructs = append(destructs, journalDestruct{Hash: hash})
}
if err := rlp.Encode(buffer, destructs); err != nil {
return common.Hash{}, err
}
accounts := make([]journalAccount, 0, len(dl.accountData))
for hash, blob := range dl.accountData {
accounts = append(accounts, journalAccount{Hash: hash, Blob: blob})
}
if err := rlp.Encode(buffer, accounts); err != nil {
return common.Hash{}, err
}
storage := make([]journalStorage, 0, len(dl.storageData))
for hash, slots := range dl.storageData {
keys := make([]common.Hash, 0, len(slots))
vals := make([][]byte, 0, len(slots))
for key, val := range slots {
keys = append(keys, key)
vals = append(vals, val)
}
storage = append(storage, journalStorage{Hash: hash, Keys: keys, Vals: vals})
}
if err := rlp.Encode(buffer, storage); err != nil {
return common.Hash{}, err
}
log.Debug("Legacy journalled diff layer", "root", dl.root, "parent", dl.parent.Root())
return base, nil
}

27
core/state/snapshot/snapshot.go
View File

@ -137,10 +137,6 @@ type snapshot interface {
// flattening everything down (bad for reorgs). // flattening everything down (bad for reorgs).
Journal(buffer *bytes.Buffer) (common.Hash, error) Journal(buffer *bytes.Buffer) (common.Hash, error)
// LegacyJournal is basically identical to Journal. it's the legacy version for
// flushing legacy journal. Now the only purpose of this function is for testing.
LegacyJournal(buffer *bytes.Buffer) (common.Hash, error)
// Stale return whether this layer has become stale (was flattened across) or // Stale return whether this layer has become stale (was flattened across) or
// if it's still live. // if it's still live.
Stale() bool Stale() bool
@ -622,29 +618,6 @@ func (t *Tree) Journal(root common.Hash) (common.Hash, error) {
return base, nil return base, nil
} }
// LegacyJournal is basically identical to Journal. it's the legacy
// version for flushing legacy journal. Now the only purpose of this
// function is for testing.
func (t *Tree) LegacyJournal(root common.Hash) (common.Hash, error) {
// Retrieve the head snapshot to journal from var snap snapshot
snap := t.Snapshot(root)
if snap == nil {
return common.Hash{}, fmt.Errorf("snapshot [%#x] missing", root)
}
// Run the journaling
t.lock.Lock()
defer t.lock.Unlock()
journal := new(bytes.Buffer)
base, err := snap.(snapshot).LegacyJournal(journal)
if err != nil {
return common.Hash{}, err
}
// Store the journal into the database and return
rawdb.WriteSnapshotJournal(t.diskdb, journal.Bytes())
return base, nil
}
// Rebuild wipes all available snapshot data from the persistent database and // Rebuild wipes all available snapshot data from the persistent database and
// discard all caches and diff layers. Afterwards, it starts a new snapshot // discard all caches and diff layers. Afterwards, it starts a new snapshot
// generator with the given root hash. // generator with the given root hash.