go/oasis-node: Add the debug dumpdb command

.changelog/2359.feature.md

@@ -0,0 +1,17 @@
+go/oasis-node/cmd/debug: Add the `dumpdb` command
+
+This command will attempt to extract the ABCI state from a combination
+of a shutdown node's on-disk database and the genesis document currently
+being used by the network, and will write the output as a JSON formatted
+genesis document.
+
+Some caveats:
+
+- It is not guaranteed that the dumped output will be usable as an
+  actual genesis document without manual intervention.
+
+- Only the state that would be exported via a normal dump from a running
+  node will be present in the dump.
+
+- The epochtime base will be that of the original genesis document, and
+  not the most recent epoch (different from a genesis dump).

go/consensus/tendermint/abci/mux.go

@@ -72,6 +72,9 @@ type ApplicationConfig struct {
 
 	// MemoryOnlyStorage forces in-memory storage to be used for the state storage.
 	MemoryOnlyStorage bool
+
+	// ReadOnlyStorage forces read-only access for the state storage.
+	ReadOnlyStorage bool
 }
 
 // TransactionAuthHandler is the interface for ABCI applications that handle

go/consensus/tendermint/abci/state.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"os"
 	"path/filepath"
 	"sync"
 	"time"
@@ -359,16 +360,31 @@ func (s *applicationState) pruneWorker() {
 	}
 }
 
-func newApplicationState(ctx context.Context, cfg *ApplicationConfig) (*applicationState, error) {
+// InitStateStorage initializes the internal ABCI state storage.
+func InitStateStorage(ctx context.Context, cfg *ApplicationConfig) (storage.LocalBackend, storage.NodeDB, *storage.Root, error) {
 	baseDir := filepath.Join(cfg.DataDir, appStateDir)
-	if err := common.Mkdir(baseDir); err != nil {
-		return nil, fmt.Errorf("failed to create application state directory: %w", err)
+	switch cfg.ReadOnlyStorage {
+	case true:
+		// Note: I'm not sure what badger does when given a path that
+		// doesn't actually contain a database, when it's set to
+		// read-only.  Hopefully it's something sensible.
+		fi, err := os.Lstat(baseDir)
+		if err != nil {
+			return nil, nil, nil, fmt.Errorf("failed to stat application state directory: %w", err)
+		}
+		if !fi.Mode().IsDir() {
+			return nil, nil, nil, fmt.Errorf("application state path is not a directory: %v", fi.Mode())
+		}
+	default:
+		if err := common.Mkdir(baseDir); err != nil {
+			return nil, nil, nil, fmt.Errorf("failed to create application state directory: %w", err)
+		}
 	}
 
 	switch cfg.StorageBackend {
 	case storageDB.BackendNameBadgerDB:
 	default:
-		return nil, fmt.Errorf("unsupported storage backend: %s", cfg.StorageBackend)
+		return nil, nil, nil, fmt.Errorf("unsupported storage backend: %s", cfg.StorageBackend)
 	}
 
 	db, err := storageDB.New(&storage.Config{
@@ -378,9 +394,10 @@ func newApplicationState(ctx context.Context, cfg *ApplicationConfig) (*applicat
 		DiscardWriteLogs: true,
 		NoFsync:          true, // This is safe as Tendermint will replay on crash.
 		MemoryOnly:       cfg.MemoryOnlyStorage,
+		ReadOnly:         cfg.ReadOnlyStorage,
 	})
 	if err != nil {
-		return nil, err
+		return nil, nil, nil, err
 	}
 	ldb := db.(storage.LocalBackend)
 	ndb := ldb.NodeDB()
@@ -396,33 +413,46 @@ func newApplicationState(ctx context.Context, cfg *ApplicationConfig) (*applicat
 	// Figure out the latest version/hash if any, and use that as the block height/hash.
 	latestVersion, err := ndb.GetLatestVersion(ctx)
 	if err != nil {
-		return nil, err
+		return nil, nil, nil, err
 	}
 	roots, err := ndb.GetRootsForVersion(ctx, latestVersion)
 	if err != nil {
-		return nil, err
+		return nil, nil, nil, err
 	}
-	stateRoot := storage.Root{
+	stateRoot := &storage.Root{
 		Version: latestVersion,
 	}
 	switch len(roots) {
 	case 0:
 		// No roots -- empty database.
 		if latestVersion != 0 {
-			return nil, fmt.Errorf("state: no roots at non-zero height, corrupted database?")
+			return nil, nil, nil, fmt.Errorf("state: no roots at non-zero height, corrupted database?")
 		}
 		stateRoot.Hash.Empty()
 	case 1:
 		// Exactly one root -- the usual case.
 		stateRoot.Hash = roots[0]
 	default:
 		// More roots -- should not happen for our use case.
-		return nil, fmt.Errorf("state: more than one root, corrupted database?")
+		return nil, nil, nil, fmt.Errorf("state: more than one root, corrupted database?")
 	}
 
+	ok = true
+
+	return ldb, ndb, stateRoot, nil
+}
+
+func newApplicationState(ctx context.Context, cfg *ApplicationConfig) (*applicationState, error) {
+	// Initialize the state storage.
+	ldb, ndb, stateRoot, err := InitStateStorage(ctx, cfg)
+	if err != nil {
+		return nil, err
+	}
+	latestVersion := stateRoot.Version
+
 	// Use the node database directly to avoid going through the syncer interface.
-	deliverTxTree := mkvs.NewWithRoot(nil, ndb, stateRoot, mkvs.WithoutWriteLog())
-	checkTxTree := mkvs.NewWithRoot(nil, ndb, stateRoot, mkvs.WithoutWriteLog())
+	deliverTxTree := mkvs.NewWithRoot(nil, ndb, *stateRoot, mkvs.WithoutWriteLog())
+	checkTxTree := mkvs.NewWithRoot(nil, ndb, *stateRoot, mkvs.WithoutWriteLog())
 
 	// Initialize the state pruner.
 	statePruner, err := newStatePruner(&cfg.Pruning, ndb, latestVersion)
@@ -443,7 +473,7 @@ func newApplicationState(ctx context.Context, cfg *ApplicationConfig) (*applicat
 		cancelCtx:       cancelCtx,
 		deliverTxTree:   deliverTxTree,
 		checkTxTree:     checkTxTree,
-		stateRoot:       stateRoot,
+		stateRoot:       *stateRoot,
 		storage:         ldb,
 		statePruner:     statePruner,
 		prunerClosedCh:  make(chan struct{}),
@@ -462,8 +492,6 @@ func newApplicationState(ctx context.Context, cfg *ApplicationConfig) (*applicat
 		}
 	}
 
-	ok = true
-
 	go s.metricsWorker()
 	go s.pruneWorker()
 

go/consensus/tendermint/abci/state/state.go

@@ -24,7 +24,7 @@ type ImmutableState struct {
 }
 
 // NewImmutableState creates a new immutable consensus backend state wrapper.
-func NewImmutableState(ctx context.Context, state api.ApplicationState, version int64) (*ImmutableState, error) {
+func NewImmutableState(ctx context.Context, state api.ApplicationQueryState, version int64) (*ImmutableState, error) {
 	is, err := api.NewImmutableState(ctx, state, version)
 	if err != nil {
 		return nil, err

go/consensus/tendermint/api/state.go

@@ -25,11 +25,7 @@ var (
 
 // ApplicationState is the overall past, present and future state of all multiplexed applications.
 type ApplicationState interface {
-	// Storage returns the storage backend.
-	Storage() storage.LocalBackend
-
-	// BlockHeight returns the last committed block height.
-	BlockHeight() int64
+	ApplicationQueryState
 
 	// BlockHash returns the last committed block hash.
 	BlockHash() []byte
@@ -49,9 +45,6 @@ type ApplicationState interface {
 	// GetBaseEpoch returns the base epoch.
 	GetBaseEpoch() (epochtime.EpochTime, error)
 
-	// GetEpoch returns epoch at block height.
-	GetEpoch(ctx context.Context, blockHeight int64) (epochtime.EpochTime, error)
-
 	// GetCurrentEpoch returns the epoch at the current block height.
 	GetCurrentEpoch(ctx context.Context) (epochtime.EpochTime, error)
 
@@ -69,6 +62,19 @@ type ApplicationState interface {
 	NewContext(mode ContextMode, now time.Time) *Context
 }
 
+// ApplicationQueryState is minimum methods required to service
+// ApplicationState queries.
+type ApplicationQueryState interface {
+	// Storage returns the storage backend.
+	Storage() storage.LocalBackend
+
+	// BlockHeight returns the last committed block height.
+	BlockHeight() int64
+
+	// GetEpoch returns epoch at block height.
+	GetEpoch(ctx context.Context, blockHeight int64) (epochtime.EpochTime, error)
+}
+
 // MockApplicationStateConfig is the configuration for the mock application state.
 type MockApplicationStateConfig struct {
 	BlockHeight int64
@@ -203,7 +209,7 @@ func (s *ImmutableState) Close() {
 }
 
 // NewImmutableState creates a new immutable state wrapper.
-func NewImmutableState(ctx context.Context, state ApplicationState, version int64) (*ImmutableState, error) {
+func NewImmutableState(ctx context.Context, state ApplicationQueryState, version int64) (*ImmutableState, error) {
 	if state == nil {
 		return nil, ErrNoState
 	}

go/consensus/tendermint/apps/beacon/query.go

@@ -4,6 +4,7 @@ import (
 	"context"
 
 	beacon "github.com/oasislabs/oasis-core/go/beacon/api"
+	abciAPI "github.com/oasislabs/oasis-core/go/consensus/tendermint/api"
 	beaconState "github.com/oasislabs/oasis-core/go/consensus/tendermint/apps/beacon/state"
 )
 
@@ -15,12 +16,12 @@ type Query interface {
 
 // QueryFactory is the beacon query factory.
 type QueryFactory struct {
-	app *beaconApplication
+	state abciAPI.ApplicationQueryState
 }
 
 // QueryAt returns the beacon query interface for a specific height.
 func (sf *QueryFactory) QueryAt(ctx context.Context, height int64) (Query, error) {
-	state, err := beaconState.NewImmutableState(ctx, sf.app.state, height)
+	state, err := beaconState.NewImmutableState(ctx, sf.state, height)
 	if err != nil {
 		return nil, err
 	}
@@ -36,5 +37,11 @@ func (bq *beaconQuerier) Beacon(ctx context.Context) ([]byte, error) {
 }
 
 func (app *beaconApplication) QueryFactory() interface{} {
-	return &QueryFactory{app}
+	return &QueryFactory{app.state}
+}
+
+// NewQueryFactory returns a new QueryFactory backed by the given state
+// instance.
+func NewQueryFactory(state abciAPI.ApplicationQueryState) *QueryFactory {
+	return &QueryFactory{state}
 }

go/consensus/tendermint/apps/beacon/state/state.go

@@ -28,7 +28,7 @@ type ImmutableState struct {
 	is *abciAPI.ImmutableState
 }
 
-func NewImmutableState(ctx context.Context, state abciAPI.ApplicationState, version int64) (*ImmutableState, error) {
+func NewImmutableState(ctx context.Context, state abciAPI.ApplicationQueryState, version int64) (*ImmutableState, error) {
 	is, err := abciAPI.NewImmutableState(ctx, state, version)
 	if err != nil {
 		return nil, err

go/consensus/tendermint/apps/epochtime_mock/query.go

@@ -3,6 +3,7 @@ package epochtimemock
 import (
 	"context"
 
+	abciAPI "github.com/oasislabs/oasis-core/go/consensus/tendermint/api"
 	epochtime "github.com/oasislabs/oasis-core/go/epochtime/api"
 )
 
@@ -13,12 +14,12 @@ type Query interface {
 
 // QueryFactory is the mock epochtime query factory.
 type QueryFactory struct {
-	app *epochTimeMockApplication
+	state abciAPI.ApplicationQueryState
 }
 
 // QueryAt returns the mock epochtime query interface for a specific height.
 func (sf *QueryFactory) QueryAt(ctx context.Context, height int64) (Query, error) {
-	state, err := newImmutableState(ctx, sf.app.state, height)
+	state, err := newImmutableState(ctx, sf.state, height)
 	if err != nil {
 		return nil, err
 	}
@@ -34,5 +35,11 @@ func (eq *epochtimeMockQuerier) Epoch(ctx context.Context) (epochtime.EpochTime,
 }
 
 func (app *epochTimeMockApplication) QueryFactory() interface{} {
-	return &QueryFactory{app}
+	return &QueryFactory{app.state}
+}
+
+// NewQueryFactory returns a new QueryFactory backed by the given state
+// instance.
+func NewQueryFactory(state abciAPI.ApplicationQueryState) *QueryFactory {
+	return &QueryFactory{state}
 }

go/consensus/tendermint/apps/epochtime_mock/state.go

@@ -63,7 +63,7 @@ func (s *immutableState) getFutureEpoch(ctx context.Context) (*mockEpochTimeStat
 	return &state, nil
 }
 
-func newImmutableState(ctx context.Context, state abciAPI.ApplicationState, version int64) (*immutableState, error) {
+func newImmutableState(ctx context.Context, state abciAPI.ApplicationQueryState, version int64) (*immutableState, error) {
 	is, err := abciAPI.NewImmutableState(ctx, state, version)
 	if err != nil {
 		return nil, err

go/consensus/tendermint/apps/keymanager/query.go

@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"github.com/oasislabs/oasis-core/go/common"
+	abciAPI "github.com/oasislabs/oasis-core/go/consensus/tendermint/api"
 	keymanagerState "github.com/oasislabs/oasis-core/go/consensus/tendermint/apps/keymanager/state"
 	keymanager "github.com/oasislabs/oasis-core/go/keymanager/api"
 )
@@ -17,12 +18,12 @@ type Query interface {
 
 // QueryFactory is the key manager query factory.
 type QueryFactory struct {
-	app *keymanagerApplication
+	state abciAPI.ApplicationQueryState
 }
 
 // QueryAt returns the key manager query interface for a specific height.
 func (sf *QueryFactory) QueryAt(ctx context.Context, height int64) (Query, error) {
-	state, err := keymanagerState.NewImmutableState(ctx, sf.app.state, height)
+	state, err := keymanagerState.NewImmutableState(ctx, sf.state, height)
 	if err != nil {
 		return nil, err
 	}
@@ -42,5 +43,11 @@ func (kq *keymanagerQuerier) Statuses(ctx context.Context) ([]*keymanager.Status
 }
 
 func (app *keymanagerApplication) QueryFactory() interface{} {
-	return &QueryFactory{app}
+	return &QueryFactory{app.state}
+}
+
+// NewQueryFactory returns a new QueryFactory backed by the given state
+// instance.
+func NewQueryFactory(state abciAPI.ApplicationQueryState) *QueryFactory {
+	return &QueryFactory{state}
 }

go/consensus/tendermint/apps/keymanager/state/state.go

@@ -74,7 +74,7 @@ func (st *ImmutableState) Status(ctx context.Context, id common.Namespace) (*api
 	return &status, nil
 }
 
-func NewImmutableState(ctx context.Context, state abciAPI.ApplicationState, version int64) (*ImmutableState, error) {
+func NewImmutableState(ctx context.Context, state abciAPI.ApplicationQueryState, version int64) (*ImmutableState, error) {
 	is, err := abciAPI.NewImmutableState(ctx, state, version)
 	if err != nil {
 		return nil, err