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Add migration to fix refs to non-existent registers
This commit adds --fix-testnet-slabs-with-broken-references flag to the migration program. It uses a feature from onflow/atree#388 to fix 10 testnet registers affecting 9 testnet accounts. The 9 testnet accounts are hardcoded in this commit to prevent accidentally applying this fix to any other accounts. In testnet, broken references seem to have resulted from a bug that was fixed 2 years ago by onflow/cadence#1565. A broken reference is a `StorageID` referencing a non-existent register. So far, only 10 registers in testnet (none on mainnet) were found to contain broken references.
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191 changes: 191 additions & 0 deletions
191
cmd/util/ledger/migrations/fix_broken_data_migration.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,191 @@ | ||
| package migrations | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
|
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| "github.com/rs/zerolog" | ||
|
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| "github.com/onflow/atree" | ||
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| "github.com/onflow/cadence/runtime/common" | ||
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| "github.com/onflow/flow-go/cmd/util/ledger/reporters" | ||
| "github.com/onflow/flow-go/ledger" | ||
| "github.com/onflow/flow-go/ledger/common/convert" | ||
| "github.com/onflow/flow-go/model/flow" | ||
| ) | ||
|
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| type FixSlabsWithBrokenReferencesMigration struct { | ||
| log zerolog.Logger | ||
| rw reporters.ReportWriter | ||
| accountsToFix map[common.Address]string | ||
| nWorkers int | ||
| } | ||
|
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| var _ AccountBasedMigration = &FixSlabsWithBrokenReferencesMigration{} | ||
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| const fixSlabsWithBrokenReferencesName = "fix-slabs-with-broken-references" | ||
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| func NewFixBrokenReferencesInSlabsMigration( | ||
| rwf reporters.ReportWriterFactory, | ||
| accountsToFix map[common.Address]string, | ||
| ) *FixSlabsWithBrokenReferencesMigration { | ||
| return &FixSlabsWithBrokenReferencesMigration{ | ||
| rw: rwf.ReportWriter(fixSlabsWithBrokenReferencesName), | ||
| accountsToFix: accountsToFix, | ||
| } | ||
| } | ||
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| func (m *FixSlabsWithBrokenReferencesMigration) InitMigration( | ||
| log zerolog.Logger, | ||
| _ []*ledger.Payload, | ||
| nWorkers int, | ||
| ) error { | ||
| m.log = log. | ||
| With(). | ||
| Str("migration", fixSlabsWithBrokenReferencesName). | ||
| Logger() | ||
| m.nWorkers = nWorkers | ||
|
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| return nil | ||
| } | ||
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| func (m *FixSlabsWithBrokenReferencesMigration) MigrateAccount( | ||
| _ context.Context, | ||
| address common.Address, | ||
| oldPayloads []*ledger.Payload, | ||
| ) ( | ||
| newPayloads []*ledger.Payload, | ||
| err error, | ||
| ) { | ||
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| if _, exist := m.accountsToFix[address]; !exist { | ||
| return oldPayloads, nil | ||
| } | ||
|
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| migrationRuntime, err := NewAtreeRegisterMigratorRuntime(address, oldPayloads) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to create cadence runtime: %w", err) | ||
| } | ||
|
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| storage := migrationRuntime.Storage | ||
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| // Load all atree registers in storage | ||
| for _, payload := range oldPayloads { | ||
| registerID, _, err := convert.PayloadToRegister(payload) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to convert payload to register: %w", err) | ||
| } | ||
|
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| if !registerID.IsSlabIndex() { | ||
| continue | ||
| } | ||
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| // Convert the register ID to a storage ID. | ||
| slabID := atree.NewStorageID( | ||
| atree.Address([]byte(registerID.Owner)), | ||
| atree.StorageIndex([]byte(registerID.Key[1:]))) | ||
|
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| // Retrieve the slab. | ||
| _, _, err = storage.Retrieve(slabID) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to retrieve slab %s: %w", slabID, err) | ||
| } | ||
| } | ||
|
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| // Fix broken references | ||
| fixedStorageIDs, skippedStorageIDs, err := storage.FixLoadedBrokenReferences(func(old atree.Value) bool { | ||
| // TODO: Cadence may need to export functions to check type info, etc. | ||
| return true | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| if len(skippedStorageIDs) > 0 { | ||
| m.log.Warn(). | ||
| Str("account", address.Hex()). | ||
| Msgf("skipped slabs with broken references: %v", skippedStorageIDs) | ||
| } | ||
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| if len(fixedStorageIDs) == 0 { | ||
| m.log.Warn(). | ||
| Str("account", address.Hex()). | ||
| Msgf("did not fix any slabs with broken references") | ||
|
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| return oldPayloads, nil | ||
| } | ||
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| m.log.Log(). | ||
| Str("account", address.Hex()). | ||
| Msgf("fixed slabs with broken references: %v", fixedStorageIDs) | ||
|
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| err = storage.FastCommit(m.nWorkers) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| // Finalize the transaction | ||
| result, err := migrationRuntime.TransactionState.FinalizeMainTransaction() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to finalize main transaction: %w", err) | ||
| } | ||
|
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| // Merge the changes to the original payloads. | ||
| expectedAddresses := map[flow.Address]struct{}{ | ||
| flow.Address(address): {}, | ||
| } | ||
|
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| newPayloads, err = migrationRuntime.Snapshot.ApplyChangesAndGetNewPayloads( | ||
| result.WriteSet, | ||
| expectedAddresses, | ||
| m.log, | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| // Log fixed payloads | ||
| fixedPayloads := make([]*ledger.Payload, 0, len(fixedStorageIDs)) | ||
| for _, payload := range newPayloads { | ||
| registerID, _, err := convert.PayloadToRegister(payload) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to convert payload to register: %w", err) | ||
| } | ||
|
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| if !registerID.IsSlabIndex() { | ||
| continue | ||
| } | ||
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| storageID := atree.NewStorageID( | ||
| atree.Address([]byte(registerID.Owner)), | ||
| atree.StorageIndex([]byte(registerID.Key[1:])), | ||
| ) | ||
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| if _, ok := fixedStorageIDs[storageID]; ok { | ||
| fixedPayloads = append(fixedPayloads, payload) | ||
| } | ||
| } | ||
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| m.rw.Write(fixedSlabsWithBrokenReferences{ | ||
| Account: address, | ||
| Payloads: fixedPayloads, | ||
| Msg: m.accountsToFix[address], | ||
| }) | ||
|
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| return newPayloads, nil | ||
| } | ||
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| func (m *FixSlabsWithBrokenReferencesMigration) Close() error { | ||
| // close the report writer so it flushes to file | ||
| m.rw.Close() | ||
|
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| return nil | ||
| } | ||
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| type fixedSlabsWithBrokenReferences struct { | ||
| Account common.Address `json:"account"` | ||
| Payloads []*ledger.Payload `json:"payloads"` | ||
| Msg string `json:"msg"` | ||
| } |
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