cmd/frostfs-lens/internal/blobovnicza/root.go

@@ -19,7 +19,7 @@ var Root = &cobra.Command{
 }
 
 func init() {
-	Root.AddCommand(listCMD, inspectCMD)
+	Root.AddCommand(listCMD, inspectCMD, tuiCMD)
 }
 
 func openBlobovnicza(cmd *cobra.Command) *blobovnicza.Blobovnicza {

cmd/frostfs-lens/internal/blobovnicza/tui.go

@@ -0,0 +1,79 @@
+package blobovnicza
+
+import (
+	"context"
+	"fmt"
+
+	common "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal"
+	schema "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/blobovnicza"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/tui"
+	"github.com/rivo/tview"
+	"github.com/spf13/cobra"
+	"go.etcd.io/bbolt"
+)
+
+var tuiCMD = &cobra.Command{
+	Use:   "explore",
+	Short: "Blobovnicza exploration with a terminal UI",
+	Long: `Launch a terminal UI to explore blobovnicza and search for data.
+
+Available search filters:
+- cid  CID
+- oid  OID
+- addr CID/OID
+`,
+	Run: tuiFunc,
+}
+
+var initialPrompt string
+
+func init() {
+	common.AddComponentPathFlag(tuiCMD, &vPath)
+
+	tuiCMD.Flags().StringVar(
+		&initialPrompt,
+		"filter",
+		"",
+		"Filter prompt to start with, format 'tag:value [+ tag:value]...'",
+	)
+}
+
+func tuiFunc(cmd *cobra.Command, _ []string) {
+	common.ExitOnErr(cmd, runTUI(cmd))
+}
+
+func runTUI(cmd *cobra.Command) error {
+	db, err := openDB(false)
+	if err != nil {
+		return fmt.Errorf("couldn't open database: %w", err)
+	}
+	defer db.Close()
+
+	ctx, cancel := context.WithCancel(cmd.Context())
+	defer cancel()
+
+	app := tview.NewApplication()
+	ui := tui.NewUI(ctx, app, db, schema.BlobovniczaParser, nil)
+
+	_ = ui.AddFilter("cid", tui.CIDParser, "CID")
+	_ = ui.AddFilter("oid", tui.OIDParser, "OID")
+	_ = ui.AddCompositeFilter("addr", tui.AddressParser, "CID/OID")
+
+	err = ui.WithPrompt(initialPrompt)
+	if err != nil {
+		return fmt.Errorf("invalid filter prompt: %w", err)
+	}
+
+	app.SetRoot(ui, true).SetFocus(ui)
+	return app.Run()
+}
+
+func openDB(writable bool) (*bbolt.DB, error) {
+	db, err := bbolt.Open(vPath, 0o600, &bbolt.Options{
+		ReadOnly: !writable,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return db, nil
+}

cmd/frostfs-lens/internal/meta/root.go

@@ -32,6 +32,7 @@ func init() {
 		inspectCMD,
 		listGraveyardCMD,
 		listGarbageCMD,
+		tuiCMD,
 	)
 }
 

cmd/frostfs-lens/internal/meta/tui.go

@@ -0,0 +1,82 @@
+package meta
+
+import (
+	"context"
+	"fmt"
+
+	common "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal"
+	schema "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/metabase"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/tui"
+	"github.com/rivo/tview"
+	"github.com/spf13/cobra"
+	"go.etcd.io/bbolt"
+)
+
+var tuiCMD = &cobra.Command{
+	Use:   "explore",
+	Short: "Metabase exploration with a terminal UI",
+	Long: `Launch a terminal UI to explore metabase and search for data.
+
+Available search filters:
+- cid  CID
+- oid  OID
+- addr CID/OID
+- attr key[/value]
+`,
+	Run: tuiFunc,
+}
+
+var initialPrompt string
+
+func init() {
+	common.AddComponentPathFlag(tuiCMD, &vPath)
+
+	tuiCMD.Flags().StringVar(
+		&initialPrompt,
+		"filter",
+		"",
+		"Filter prompt to start with, format 'tag:value [+ tag:value]...'",
+	)
+}
+
+func tuiFunc(cmd *cobra.Command, _ []string) {
+	common.ExitOnErr(cmd, runTUI(cmd))
+}
+
+func runTUI(cmd *cobra.Command) error {
+	db, err := openDB(false)
+	if err != nil {
+		return fmt.Errorf("couldn't open database: %w", err)
+	}
+	defer db.Close()
+
+	// Need if app was stopped with Ctrl-C.
+	ctx, cancel := context.WithCancel(cmd.Context())
+	defer cancel()
+
+	app := tview.NewApplication()
+	ui := tui.NewUI(ctx, app, db, schema.MetabaseParser, nil)
+
+	_ = ui.AddFilter("cid", tui.CIDParser, "CID")
+	_ = ui.AddFilter("oid", tui.OIDParser, "OID")
+	_ = ui.AddCompositeFilter("addr", tui.AddressParser, "CID/OID")
+	_ = ui.AddCompositeFilter("attr", tui.AttributeParser, "key[/value]")
+
+	err = ui.WithPrompt(initialPrompt)
+	if err != nil {
+		return fmt.Errorf("invalid filter prompt: %w", err)
+	}
+
+	app.SetRoot(ui, true).SetFocus(ui)
+	return app.Run()
+}
+
+func openDB(writable bool) (*bbolt.DB, error) {
+	db, err := bbolt.Open(vPath, 0o600, &bbolt.Options{
+		ReadOnly: !writable,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return db, nil
+}

cmd/frostfs-lens/internal/schema/blobovnicza/parsers.go

@@ -0,0 +1,96 @@
+package blobovnicza
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"strings"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/mr-tron/base58"
+)
+
+var BlobovniczaParser = common.WithFallback(
+	common.Any(
+		MetaBucketParser,
+		BucketParser,
+	),
+	common.RawParser.ToFallbackParser(),
+)
+
+func MetaBucketParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if value != nil {
+		return nil, nil, errors.New("not a bucket")
+	}
+
+	if string(key) != "META" {
+		return nil, nil, errors.New("invalid bucket name")
+	}
+
+	return &MetaBucket{}, MetaRecordParser, nil
+}
+
+func MetaRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	var r MetaRecord
+
+	if len(key) == 0 {
+		return nil, nil, errors.New("invalid key")
+	}
+
+	r.label = string(key)
+	r.count = binary.LittleEndian.Uint64(value)
+
+	return &r, nil, nil
+}
+
+func BucketParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if value != nil {
+		return nil, nil, errors.New("not a bucket")
+	}
+
+	size, n := binary.Varint(key)
+	if n <= 0 {
+		return nil, nil, errors.New("invalid size")
+	}
+
+	return &Bucket{size: size}, RecordParser, nil
+}
+
+func RecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	parts := strings.Split(string(key), "/")
+
+	if len(parts) != 2 {
+		return nil, nil, errors.New("invalid key, expected address string <CID>/<OID>")
+	}
+
+	cnrRaw, err := base58.Decode(parts[0])
+	if err != nil {
+		return nil, nil, errors.New("can't decode CID string")
+	}
+	objRaw, err := base58.Decode(parts[1])
+	if err != nil {
+		return nil, nil, errors.New("can't decode OID string")
+	}
+
+	cnr := cid.ID{}
+	if err := cnr.Decode(cnrRaw); err != nil {
+		return nil, nil, fmt.Errorf("can't decode CID: %w", err)
+	}
+	obj := oid.ID{}
+	if err := obj.Decode(objRaw); err != nil {
+		return nil, nil, fmt.Errorf("can't decode OID: %w", err)
+	}
+
+	var r Record
+
+	r.addr.SetContainer(cnr)
+	r.addr.SetObject(obj)
+
+	if err := r.object.Unmarshal(value); err != nil {
+		return nil, nil, errors.New("can't unmarshal object")
+	}
+
+	return &r, nil, nil
+}

cmd/frostfs-lens/internal/schema/blobovnicza/types.go

@@ -0,0 +1,101 @@
+package blobovnicza
+
+import (
+	"fmt"
+	"strconv"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/davecgh/go-spew/spew"
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+type (
+	MetaBucket struct{}
+
+	MetaRecord struct {
+		label string
+		count uint64
+	}
+
+	Bucket struct {
+		size int64
+	}
+
+	Record struct {
+		addr   oid.Address
+		object objectSDK.Object
+	}
+)
+
+func (b *MetaBucket) String() string {
+	return common.FormatSimple("META", tcell.ColorLime)
+}
+
+func (b *MetaBucket) DetailedString() string {
+	return spew.Sdump(*b)
+}
+
+func (b *MetaBucket) Filter(string, any) common.FilterResult {
+	return common.No
+}
+
+func (r *MetaRecord) String() string {
+	return fmt.Sprintf("%-11s %c %d", r.label, tview.Borders.Vertical, r.count)
+}
+
+func (r *MetaRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *MetaRecord) Filter(string, any) common.FilterResult {
+	return common.No
+}
+
+func (b *Bucket) String() string {
+	return common.FormatSimple(strconv.FormatInt(b.size, 10), tcell.ColorLime)
+}
+
+func (b *Bucket) DetailedString() string {
+	return spew.Sdump(*b)
+}
+
+func (b *Bucket) Filter(typ string, _ any) common.FilterResult {
+	switch typ {
+	case "cid":
+		return common.Maybe
+	case "oid":
+		return common.Maybe
+	default:
+		return common.No
+	}
+}
+
+func (r *Record) String() string {
+	return fmt.Sprintf(
+		"CID %s OID %s %c Object {...}",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.addr.Container()), tcell.ColorAqua),
+		common.FormatSimple(fmt.Sprintf("%-44s", r.addr.Object()), tcell.ColorAqua),
+		tview.Borders.Vertical,
+	)
+}
+
+func (r *Record) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *Record) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return common.IfThenElse(r.addr.Container().Equals(id), common.Yes, common.No)
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.addr.Object().Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}

cmd/frostfs-lens/internal/schema/common/format.go

@@ -0,0 +1,43 @@
+package common
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+type FormatOptions struct {
+	Color tcell.Color
+
+	Bold,
+	Italic,
+	Underline,
+	StrikeThrough bool
+}
+
+func Format(s string, opts FormatOptions) string {
+	var boldTag, italicTag, underlineTag, strikeThroughTag string
+
+	switch {
+	case opts.Bold:
+		boldTag = "b"
+	case opts.Italic:
+		italicTag = "i"
+	case opts.Underline:
+		underlineTag = "u"
+	case opts.StrikeThrough:
+		strikeThroughTag = "s"
+	}
+
+	attrs := fmt.Sprintf(
+		"%s%s%s%s", boldTag, italicTag, underlineTag, strikeThroughTag,
+	)
+	color := strconv.FormatInt(int64(opts.Color.Hex()), 16)
+
+	return fmt.Sprintf("[#%06s::%s]%s[-::-]", color, attrs, s)
+}
+
+func FormatSimple(s string, c tcell.Color) string {
+	return Format(s, FormatOptions{Color: c})
+}

cmd/frostfs-lens/internal/schema/common/raw.go

@@ -0,0 +1,29 @@
+package common
+
+import (
+	"github.com/davecgh/go-spew/spew"
+	"github.com/gdamore/tcell/v2"
+	"github.com/mr-tron/base58"
+)
+
+type RawEntry struct {
+	key, value []byte
+}
+
+var RawParser Parser = rawParser
+
+func rawParser(key, value []byte) (SchemaEntry, Parser, error) {
+	return &RawEntry{key: key, value: value}, rawParser, nil
+}
+
+func (r *RawEntry) String() string {
+	return FormatSimple(base58.Encode(r.key), tcell.ColorRed)
+}
+
+func (r *RawEntry) DetailedString() string {
+	return spew.Sdump(r)
+}
+
+func (r *RawEntry) Filter(string, any) FilterResult {
+	return No
+}

cmd/frostfs-lens/internal/schema/common/schema.go

@@ -0,0 +1,81 @@
+package common
+
+import (
+	"errors"
+	"fmt"
+)
+
+type FilterResult byte
+
+const (
+	No FilterResult = iota
+	Maybe
+	Yes
+)
+
+func IfThenElse(condition bool, onSuccess, onFailure FilterResult) FilterResult {
+	var res FilterResult
+	if condition {
+		res = onSuccess
+	} else {
+		res = onFailure
+	}
+	return res
+}
+
+type SchemaEntry interface {
+	String() string
+	DetailedString() string
+	Filter(typ string, val any) FilterResult
+}
+
+type (
+	Parser         func(key, value []byte) (SchemaEntry, Parser, error)
+	FallbackParser func(key, value []byte) (SchemaEntry, Parser)
+)
+
+func Any(parsers ...Parser) Parser {
+	return func(key, value []byte) (SchemaEntry, Parser, error) {
+		var errs error
+		for _, parser := range parsers {
+			ret, next, err := parser(key, value)
+			if err == nil {
+				return ret, next, nil
+			}
+			errs = errors.Join(errs, err)
+		}
+		return nil, nil, fmt.Errorf("no parser succeeded: %w", errs)
+	}
+}
+
+func WithFallback(parser Parser, fallback FallbackParser) Parser {
+	if parser == nil {
+		return fallback.ToParser()
+	}
+	return func(key, value []byte) (SchemaEntry, Parser, error) {
+		entry, next, err := parser(key, value)
+		if err == nil {
+			return entry, WithFallback(next, fallback), nil
+		}
+		return fallback.ToParser()(key, value)
+	}
+}
+
+func (fp FallbackParser) ToParser() Parser {
+	return func(key, value []byte) (SchemaEntry, Parser, error) {
+		entry, next := fp(key, value)
+		return entry, next, nil
+	}
+}
+
+func (p Parser) ToFallbackParser() FallbackParser {
+	return func(key, value []byte) (SchemaEntry, Parser) {
+		entry, next, err := p(key, value)
+		if err != nil {
+			panic(fmt.Errorf(
+				"couldn't use that parser as a fallback parser, it returned an error: %w", err,
+			))
+		}
+		return entry, next
+	}
+}

cmd/frostfs-lens/internal/schema/metabase/buckets/detailed.go

@@ -0,0 +1,29 @@
+package buckets
+
+import (
+	"github.com/davecgh/go-spew/spew"
+)
+
+func (b *PrefixBucket) DetailedString() string {
+	return spew.Sdump(*b)
+}
+
+func (b *PrefixContainerBucket) DetailedString() string {
+	return spew.Sdump(*b)
+}
+
+func (b *UserBucket) DetailedString() string {
+	return spew.Sdump(*b)
+}
+
+func (b *ContainerBucket) DetailedString() string {
+	return spew.Sdump(*b)
+}
+
+func (b *UserAttributeKeyBucket) DetailedString() string {
+	return spew.Sdump(*b)
+}
+
+func (b *UserAttributeValueBucket) DetailedString() string {
+	return spew.Sdump(*b)
+}

cmd/frostfs-lens/internal/schema/metabase/buckets/filter.go

@@ -0,0 +1,81 @@
+package buckets
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+)
+
+func (b *PrefixBucket) Filter(typ string, _ any) common.FilterResult {
+	switch typ {
+	case "cid":
+		return b.resolvers.cidResolver(false)
+	case "oid":
+		return b.resolvers.oidResolver(false)
+	default:
+		return common.No
+	}
+}
+
+func (b *PrefixContainerBucket) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return b.resolvers.cidResolver(b.id.Equals(id))
+	case "oid":
+		return b.resolvers.oidResolver(false)
+	default:
+		return common.No
+	}
+}
+
+func (b *UserBucket) Filter(typ string, _ any) common.FilterResult {
+	switch typ {
+	case "cid":
+		return b.resolvers.cidResolver(false)
+	case "oid":
+		return b.resolvers.oidResolver(false)
+	default:
+		return common.No
+	}
+}
+
+func (b *ContainerBucket) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return b.resolvers.cidResolver(b.id.Equals(id))
+	case "oid":
+		return b.resolvers.oidResolver(false)
+	default:
+		return common.No
+	}
+}
+
+func (b *UserAttributeKeyBucket) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return common.IfThenElse(b.id.Equals(id), common.Yes, common.No)
+	case "oid":
+		return common.Maybe
+	case "key":
+		key := val.(string)
+		return common.IfThenElse(b.key == key, common.Yes, common.No)
+	case "value":
+		return common.Maybe
+	default:
+		return common.No
+	}
+}
+
+func (b *UserAttributeValueBucket) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		return common.Maybe
+	case "value":
+		value := val.(string)
+		return common.IfThenElse(b.value == value, common.Yes, common.No)
+	default:
+		return common.No
+	}
+}

cmd/frostfs-lens/internal/schema/metabase/buckets/parsers.go

@@ -0,0 +1,111 @@
+package buckets
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/metabase/records"
+)
+
+var (
+	GraveyardParser = NewPrefixBucketParser(Graveyard, records.GraveyardRecordParser, Resolvers{
+		cidResolver: LenientResolver,
+		oidResolver: LenientResolver,
+	})
+
+	GarbageParser = NewPrefixBucketParser(Garbage, records.GarbageRecordParser, Resolvers{
+		cidResolver: LenientResolver,
+		oidResolver: LenientResolver,
+	})
+
+	ContainerVolumeParser = NewPrefixBucketParser(ContainerVolume, records.ContainerVolumeRecordParser, Resolvers{
+		cidResolver: LenientResolver,
+		oidResolver: StrictResolver,
+	})
+
+	LockedParser = NewPrefixBucketParser(
+		Locked,
+		NewContainerBucketParser(
+			records.LockedRecordParser,
+			Resolvers{
+				cidResolver: StrictResolver,
+				oidResolver: LenientResolver,
+			},
+		),
+		Resolvers{
+			cidResolver: LenientResolver,
+			oidResolver: LenientResolver,
+		},
+	)
+
+	ShardInfoParser = NewPrefixBucketParser(ShardInfo, records.ShardInfoRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: StrictResolver,
+	})
+
+	PrimaryParser = NewPrefixContainerBucketParser(Primary, records.ObjectRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: LenientResolver,
+	})
+
+	LockersParser = NewPrefixContainerBucketParser(Lockers, records.ObjectRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: LenientResolver,
+	})
+
+	TombstoneParser = NewPrefixContainerBucketParser(Tombstone, records.ObjectRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: LenientResolver,
+	})
+
+	SmallParser = NewPrefixContainerBucketParser(Small, records.SmallRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: LenientResolver,
+	})
+
+	RootParser = NewPrefixContainerBucketParser(Root, records.RootRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: LenientResolver,
+	})
+
+	OwnerParser = NewPrefixContainerBucketParser(
+		Owner,
+		NewUserBucketParser(
+			records.OwnerRecordParser,
+			Resolvers{
+				cidResolver: StrictResolver,
+				oidResolver: LenientResolver,
+			},
+		),
+		Resolvers{
+			cidResolver: StrictResolver,
+			oidResolver: LenientResolver,
+		},
+	)
+
+	UserAttributeParser = NewUserAttributeKeyBucketParser(
+		NewUserAttributeValueBucketParser(records.UserAttributeRecordParser),
+	)
+
+	PayloadHashParser = NewPrefixContainerBucketParser(PayloadHash, records.PayloadHashRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: StrictResolver,
+	})
+
+	ParentParser = NewPrefixContainerBucketParser(Parent, records.ParentRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: LenientResolver,
+	})
+
+	SplitParser = NewPrefixContainerBucketParser(Split, records.SplitRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: StrictResolver,
+	})
+
+	ContainerCountersParser = NewPrefixBucketParser(ContainerCounters, records.ContainerCountersRecordParser, Resolvers{
+		cidResolver: LenientResolver,
+		oidResolver: StrictResolver,
+	})
+
+	ECInfoParser = NewPrefixContainerBucketParser(ECInfo, records.ECInfoRecordParser, Resolvers{
+		cidResolver: StrictResolver,
+		oidResolver: LenientResolver,
+	})
+)

cmd/frostfs-lens/internal/schema/metabase/buckets/prefix.go

@@ -0,0 +1,53 @@
+package buckets
+
+type Prefix byte
+
+const (
+	Graveyard Prefix = iota
+	Garbage
+	ToMoveIt
+	ContainerVolume
+	Locked
+	ShardInfo
+	Primary
+	Lockers
+	_
+	Tombstone
+	Small
+	Root
+	Owner
+	UserAttribute
+	PayloadHash
+	Parent
+	Split
+	ContainerCounters
+	ECInfo
+)
+
+var x = map[Prefix]string{
+	Graveyard:         "Graveyard",
+	Garbage:           "Garbage",
+	ToMoveIt:          "To Move It",
+	ContainerVolume:   "Container Volume",
+	Locked:            "Locked",
+	ShardInfo:         "Shard Info",
+	Primary:           "Primary",
+	Lockers:           "Lockers",
+	Tombstone:         "Tombstone",
+	Small:             "Small",
+	Root:              "Root",
+	Owner:             "Owner",
+	UserAttribute:     "User Attribute",
+	PayloadHash:       "Payload Hash",
+	Parent:            "Parent",
+	Split:             "Split",
+	ContainerCounters: "Container Counters",
+	ECInfo:            "EC Info",
+}
+
+func (p Prefix) String() string {
+	if s, ok := x[p]; ok {
+		return s
+	}
+	return "Unknown Prefix"
+}

cmd/frostfs-lens/internal/schema/metabase/buckets/string.go

@@ -0,0 +1,48 @@
+package buckets
+
+import (
+	"fmt"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	"github.com/gdamore/tcell/v2"
+)
+
+func (b *PrefixBucket) String() string {
+	return common.FormatSimple(
+		fmt.Sprintf("(%2d %-18s)", b.prefix, b.prefix), tcell.ColorLime,
+	)
+}
+
+func (b *PrefixContainerBucket) String() string {
+	return fmt.Sprintf(
+		"%s CID %s",
+		common.FormatSimple(
+			fmt.Sprintf("(%2d %-18s)", b.prefix, b.prefix), tcell.ColorLime,
+		),
+		common.FormatSimple(b.id.String(), tcell.ColorAqua),
+	)
+}
+
+func (b *UserBucket) String() string {
+	return "UID " + common.FormatSimple(b.id.String(), tcell.ColorAqua)
+}
+
+func (b *ContainerBucket) String() string {
+	return "CID " + common.FormatSimple(b.id.String(), tcell.ColorAqua)
+}
+
+func (b *UserAttributeKeyBucket) String() string {
+	return fmt.Sprintf("%s CID %s ATTR-KEY %s",
+		common.FormatSimple(
+			fmt.Sprintf("(%2d %-18s)", b.prefix, b.prefix), tcell.ColorLime,
+		),
+		common.FormatSimple(
+			fmt.Sprintf("%-44s", b.id), tcell.ColorAqua,
+		),
+		common.FormatSimple(b.key, tcell.ColorAqua),
+	)
+}
+
+func (b *UserAttributeValueBucket) String() string {
+	return "ATTR-VALUE " + common.FormatSimple(b.value, tcell.ColorAqua)
+}

cmd/frostfs-lens/internal/schema/metabase/buckets/types.go

@@ -0,0 +1,166 @@
+package buckets
+
+import (
+	"errors"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+	"github.com/mr-tron/base58"
+)
+
+type (
+	PrefixBucket struct {
+		prefix    Prefix
+		resolvers Resolvers
+	}
+
+	PrefixContainerBucket struct {
+		prefix    Prefix
+		id        cid.ID
+		resolvers Resolvers
+	}
+
+	ContainerBucket struct {
+		id        cid.ID
+		resolvers Resolvers
+	}
+
+	UserBucket struct {
+		id        user.ID
+		resolvers Resolvers
+	}
+
+	UserAttributeKeyBucket struct {
+		prefix Prefix
+		id     cid.ID
+		key    string
+	}
+
+	UserAttributeValueBucket struct {
+		value string
+	}
+)
+
+type (
+	FilterResolver = func(result bool) common.FilterResult
+
+	Resolvers struct {
+		cidResolver FilterResolver
+		oidResolver FilterResolver
+	}
+)
+
+var (
+	StrictResolver  = func(x bool) common.FilterResult { return common.IfThenElse(x, common.Yes, common.No) }
+	LenientResolver = func(x bool) common.FilterResult { return common.IfThenElse(x, common.Yes, common.Maybe) }
+)
+
+var (
+	ErrNotBucket          = errors.New("not a bucket")
+	ErrInvalidKeyLength   = errors.New("invalid key length")
+	ErrInvalidValueLength = errors.New("invalid value length")
+	ErrInvalidPrefix      = errors.New("invalid prefix")
+)
+
+func NewPrefixBucketParser(prefix Prefix, next common.Parser, resolvers Resolvers) common.Parser {
+	return func(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+		if value != nil {
+			return nil, nil, ErrNotBucket
+		}
+		if len(key) != 1 {
+			return nil, nil, ErrInvalidKeyLength
+		}
+		var b PrefixBucket
+		if b.prefix = Prefix(key[0]); b.prefix != prefix {
+			return nil, nil, ErrInvalidPrefix
+		}
+		b.resolvers = resolvers
+		return &b, next, nil
+	}
+}
+
+func NewPrefixContainerBucketParser(prefix Prefix, next common.Parser, resolvers Resolvers) common.Parser {
+	return func(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+		if value != nil {
+			return nil, nil, ErrNotBucket
+		}
+		if len(key) != 33 {
+			return nil, nil, ErrInvalidKeyLength
+		}
+		var b PrefixContainerBucket
+		if b.prefix = Prefix(key[0]); b.prefix != prefix {
+			return nil, nil, ErrInvalidPrefix
+		}
+		if err := b.id.Decode(key[1:]); err != nil {
+			return nil, nil, err
+		}
+		b.resolvers = resolvers
+		return &b, next, nil
+	}
+}
+
+func NewUserBucketParser(next common.Parser, resolvers Resolvers) common.Parser {
+	return func(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+		if value != nil {
+			return nil, nil, ErrNotBucket
+		}
+		var b UserBucket
+		if err := b.id.DecodeString(base58.Encode(key)); err != nil {
+			return nil, nil, err
+		}
+		b.resolvers = resolvers
+		return &b, next, nil
+	}
+}
+
+func NewContainerBucketParser(next common.Parser, resolvers Resolvers) common.Parser {
+	return func(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+		if value != nil {
+			return nil, nil, ErrNotBucket
+		}
+		if len(key) != 32 {
+			return nil, nil, ErrInvalidKeyLength
+		}
+		var b ContainerBucket
+		if err := b.id.Decode(key); err != nil {
+			return nil, nil, err
+		}
+		b.resolvers = resolvers
+		return &b, next, nil
+	}
+}
+
+func NewUserAttributeKeyBucketParser(next common.Parser) common.Parser {
+	return func(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+		if value != nil {
+			return nil, nil, ErrNotBucket
+		}
+		if len(key) < 34 {
+			return nil, nil, ErrInvalidKeyLength
+		}
+		var b UserAttributeKeyBucket
+		if b.prefix = Prefix(key[0]); b.prefix != UserAttribute {
+			return nil, nil, ErrInvalidPrefix
+		}
+		if err := b.id.Decode(key[1:33]); err != nil {
+			return nil, nil, err
+		}
+		b.key = string(key[33:])
+		return &b, next, nil
+	}
+}
+
+func NewUserAttributeValueBucketParser(next common.Parser) common.Parser {
+	return func(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+		if value != nil {
+			return nil, nil, ErrNotBucket
+		}
+		if len(key) == 0 {
+			return nil, nil, ErrInvalidKeyLength
+		}
+		var b UserAttributeValueBucket
+		b.value = string(key)
+		return &b, next, nil
+	}
+}

cmd/frostfs-lens/internal/schema/metabase/parser.go

@@ -0,0 +1,29 @@
+package metabase
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/metabase/buckets"
+)
+
+var MetabaseParser = common.WithFallback(
+	common.Any(
+		buckets.GraveyardParser,
+		buckets.GarbageParser,
+		buckets.ContainerVolumeParser,
+		buckets.LockedParser,
+		buckets.ShardInfoParser,
+		buckets.PrimaryParser,
+		buckets.LockersParser,
+		buckets.TombstoneParser,
+		buckets.SmallParser,
+		buckets.RootParser,
+		buckets.OwnerParser,
+		buckets.UserAttributeParser,
+		buckets.PayloadHashParser,
+		buckets.ParentParser,
+		buckets.SplitParser,
+		buckets.ContainerCountersParser,
+		buckets.ECInfoParser,
+	),
+	common.RawParser.ToFallbackParser(),
+)

cmd/frostfs-lens/internal/schema/metabase/records/detailed.go

@@ -0,0 +1,65 @@
+package records
+
+import (
+	"github.com/davecgh/go-spew/spew"
+)
+
+func (r *GraveyardRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *GarbageRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *ContainerVolumeRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *LockedRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *ShardInfoRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *ObjectRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *SmallRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *RootRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *OwnerRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *UserAttributeRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *PayloadHashRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *ParentRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *SplitRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *ContainerCountersRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (r *ECInfoRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}

cmd/frostfs-lens/internal/schema/metabase/records/filter.go

@@ -0,0 +1,145 @@
+package records
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+)
+
+func (r *GraveyardRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return common.IfThenElse(r.object.Container().Equals(id), common.Yes, common.No)
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.object.Object().Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *GarbageRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return common.IfThenElse(r.addr.Container().Equals(id), common.Yes, common.No)
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.addr.Object().Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *ContainerVolumeRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *ShardInfoRecord) Filter(string, any) common.FilterResult {
+	return common.No
+}
+
+func (r *LockedRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *ObjectRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *SmallRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *RootRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *OwnerRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *UserAttributeRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *PayloadHashRecord) Filter(string, any) common.FilterResult {
+	return common.No
+}
+
+func (r *ParentRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.parent.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *SplitRecord) Filter(string, any) common.FilterResult {
+	return common.No
+}
+
+func (r *ContainerCountersRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}
+
+func (r *ECInfoRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.id.Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}

cmd/frostfs-lens/internal/schema/metabase/records/parsers.go

@@ -0,0 +1,251 @@
+package records
+
+import (
+	"encoding/binary"
+	"errors"
+	"strconv"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+)
+
+var (
+	ErrInvalidKeyLength   = errors.New("invalid key length")
+	ErrInvalidValueLength = errors.New("invalid value length")
+	ErrInvalidPrefix      = errors.New("invalid prefix")
+)
+
+func GraveyardRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if len(key) != 64 {
+		return nil, nil, ErrInvalidKeyLength
+	}
+	if len(value) != 64 {
+		return nil, nil, ErrInvalidValueLength
+	}
+	var (
+		cnr cid.ID
+		obj oid.ID
+		r   GraveyardRecord
+	)
+
+	_ = cnr.Decode(key[:32])
+	_ = obj.Decode(key[32:])
+
+	r.object.SetContainer(cnr)
+	r.object.SetObject(obj)
+
+	_ = cnr.Decode(value[:32])
+	_ = obj.Decode(value[32:])
+
+	r.tombstone.SetContainer(cnr)
+	r.tombstone.SetObject(obj)
+
+	return &r, nil, nil
+}
+
+func GarbageRecordParser(key, _ []byte) (common.SchemaEntry, common.Parser, error) {
+	if len(key) != 64 {
+		return nil, nil, ErrInvalidKeyLength
+	}
+	var (
+		cnr cid.ID
+		obj oid.ID
+		r   GarbageRecord
+	)
+
+	_ = cnr.Decode(key[:32])
+	_ = obj.Decode(key[32:])
+
+	r.addr.SetContainer(cnr)
+	r.addr.SetObject(obj)
+
+	return &r, nil, nil
+}
+
+func ContainerVolumeRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if len(key) != 32 {
+		return nil, nil, ErrInvalidKeyLength
+	}
+	if len(value) != 8 {
+		return nil, nil, ErrInvalidValueLength
+	}
+	var r ContainerVolumeRecord
+
+	_ = r.id.Decode(key)
+	r.volume = binary.LittleEndian.Uint64(value)
+
+	return &r, nil, nil
+}
+
+func LockedRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	var (
+		r   LockedRecord
+		err error
+	)
+
+	if err := r.id.Decode(key); err != nil {
+		return nil, nil, err
+	}
+	if r.ids, err = DecodeOIDs(value); err != nil {
+		return nil, nil, err
+	}
+	return &r, nil, nil
+}
+
+func ShardInfoRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if len(key) == 0 {
+		return nil, nil, ErrInvalidKeyLength
+	}
+
+	var r ShardInfoRecord
+	if string(key) == "id" {
+		r.label = string(key)
+		r.value = shard.ID(value).String()
+
+		return &r, nil, nil
+	}
+
+	if len(value) != 8 {
+		return nil, nil, ErrInvalidValueLength
+	}
+	r.label = string(key)
+	r.value = strconv.FormatUint(binary.LittleEndian.Uint64(value), 10)
+
+	return &r, nil, nil
+}
+
+func ObjectRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if len(key) != 32 {
+		return nil, nil, ErrInvalidKeyLength
+	}
+	var r ObjectRecord
+
+	_ = r.id.Decode(key)
+	if err := r.object.Unmarshal(value); err != nil {
+		return nil, nil, err
+	}
+
+	return &r, nil, nil
+}
+
+func SmallRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	var r SmallRecord
+	if err := r.id.Decode(key); err != nil {
+		return nil, nil, err
+	}
+	if len(value) != 0 {
+		x := string(value)
+		r.storageID = &x
+	}
+	return &r, nil, nil
+}
+
+func RootRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	var r RootRecord
+	if err := r.id.Decode(key); err != nil {
+		return nil, nil, err
+	}
+	if len(value) == 0 {
+		return &r, nil, nil
+	}
+	r.info = &objectSDK.SplitInfo{}
+	if err := r.info.Unmarshal(value); err != nil {
+		return nil, nil, err
+	}
+	return &r, nil, nil
+}
+
+func OwnerRecordParser(key, _ []byte) (common.SchemaEntry, common.Parser, error) {
+	var r OwnerRecord
+	if err := r.id.Decode(key); err != nil {
+		return nil, nil, err
+	}
+	return &r, nil, nil
+}
+
+func UserAttributeRecordParser(key, _ []byte) (common.SchemaEntry, common.Parser, error) {
+	var r UserAttributeRecord
+	if err := r.id.Decode(key); err != nil {
+		return nil, nil, err
+	}
+	return &r, nil, nil
+}
+
+func PayloadHashRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if len(key) != 32 {
+		return nil, nil, ErrInvalidKeyLength
+	}
+	var (
+		err error
+		r   PayloadHashRecord
+	)
+
+	r.checksum.SetSHA256([32]byte(key))
+	if r.ids, err = DecodeOIDs(value); err != nil {
+		return nil, nil, err
+	}
+	return &r, nil, nil
+}
+
+func ParentRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	var (
+		r   ParentRecord
+		err error
+	)
+	if err = r.parent.Decode(key); err != nil {
+		return nil, nil, err
+	}
+	if r.ids, err = DecodeOIDs(value); err != nil {
+		return nil, nil, err
+	}
+	return &r, nil, nil
+}
+
+func SplitRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	var (
+		err error
+		r   SplitRecord
+	)
+	if err = r.id.UnmarshalBinary(key); err != nil {
+		return nil, nil, err
+	}
+	if r.ids, err = DecodeOIDs(value); err != nil {
+		return nil, nil, err
+	}
+	return &r, nil, nil
+}
+
+func ContainerCountersRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if len(value) != 24 {
+		return nil, nil, ErrInvalidValueLength
+	}
+
+	var r ContainerCountersRecord
+	if err := r.id.Decode(key); err != nil {
+		return nil, nil, err
+	}
+
+	r.logical = binary.LittleEndian.Uint64(value[:8])
+	r.physical = binary.LittleEndian.Uint64(value[8:16])
+	r.user = binary.LittleEndian.Uint64(value[16:24])
+
+	return &r, nil, nil
+}
+
+func ECInfoRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	var (
+		r   ECInfoRecord
+		err error
+	)
+
+	if err := r.id.Decode(key); err != nil {
+		return nil, nil, err
+	}
+	if r.ids, err = DecodeOIDs(value); err != nil {
+		return nil, nil, err
+	}
+	return &r, nil, nil
+}

cmd/frostfs-lens/internal/schema/metabase/records/string.go

@@ -0,0 +1,135 @@
+package records
+
+import (
+	"fmt"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+func (r *GraveyardRecord) String() string {
+	return fmt.Sprintf(
+		"Object CID %s OID %s %c Tombstone CID %s OID %s",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.object.Container()), tcell.ColorAqua),
+		common.FormatSimple(fmt.Sprintf("%-44s", r.object.Object()), tcell.ColorAqua),
+		tview.Borders.Vertical,
+		common.FormatSimple(fmt.Sprintf("%-44s", r.tombstone.Container()), tcell.ColorAqua),
+		common.FormatSimple(fmt.Sprintf("%-44s", r.tombstone.Object()), tcell.ColorAqua),
+	)
+}
+
+func (r *GarbageRecord) String() string {
+	return fmt.Sprintf(
+		"CID %-44s OID %-44s",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.addr.Container()), tcell.ColorAqua),
+		common.FormatSimple(fmt.Sprintf("%-44s", r.addr.Object()), tcell.ColorAqua),
+	)
+}
+
+func (r *ContainerVolumeRecord) String() string {
+	return fmt.Sprintf(
+		"CID %-44s %c %d",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.id), tcell.ColorAqua),
+		tview.Borders.Vertical,
+		r.volume,
+	)
+}
+
+func (r *LockedRecord) String() string {
+	return fmt.Sprintf(
+		"Locker OID %s %c Locked [%d]OID {...}",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.id), tcell.ColorAqua),
+		tview.Borders.Vertical,
+		len(r.ids),
+	)
+}
+
+func (r *ShardInfoRecord) String() string {
+	return fmt.Sprintf("%-13s %c %s", r.label, tview.Borders.Vertical, r.value)
+}
+
+func (r *ObjectRecord) String() string {
+	return fmt.Sprintf(
+		"OID %s %c Object {...}",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.id), tcell.ColorAqua),
+		tview.Borders.Vertical,
+	)
+}
+
+func (r *SmallRecord) String() string {
+	s := fmt.Sprintf(
+		"OID %s %c",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.id), tcell.ColorAqua),
+		tview.Borders.Vertical,
+	)
+	if r.storageID != nil {
+		s = fmt.Sprintf("%s %s", s, *r.storageID)
+	}
+	return s
+}
+
+func (r *RootRecord) String() string {
+	s := fmt.Sprintf(
+		"Root OID %s %c",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.id), tcell.ColorAqua),
+		tview.Borders.Vertical,
+	)
+	if r.info != nil {
+		s += " Split info {...}"
+	}
+	return s
+}
+
+func (r *OwnerRecord) String() string {
+	return "OID " + common.FormatSimple(r.id.String(), tcell.ColorAqua)
+}
+
+func (r *UserAttributeRecord) String() string {
+	return "OID " + common.FormatSimple(r.id.String(), tcell.ColorAqua)
+}
+
+func (r *PayloadHashRecord) String() string {
+	return fmt.Sprintf(
+		"Checksum %s %c [%d]OID {...}",
+		common.FormatSimple(r.checksum.String(), tcell.ColorAqua),
+		tview.Borders.Vertical,
+		len(r.ids),
+	)
+}
+
+func (r *ParentRecord) String() string {
+	return fmt.Sprintf(
+		"Parent OID %s %c [%d]OID {...}",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.parent), tcell.ColorAqua),
+		tview.Borders.Vertical,
+		len(r.ids),
+	)
+}
+
+func (r *SplitRecord) String() string {
+	return fmt.Sprintf(
+		"Split ID %s %c [%d]OID {...}",
+		common.FormatSimple(r.id.String(), tcell.ColorAqua),
+		tview.Borders.Vertical,
+		len(r.ids),
+	)
+}
+
+func (r *ContainerCountersRecord) String() string {
+	return fmt.Sprintf(
+		"CID %s %c logical %d, physical %d, user %d",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.id), tcell.ColorAqua),
+		tview.Borders.Vertical,
+		r.logical, r.physical, r.user,
+	)
+}
+
+func (r *ECInfoRecord) String() string {
+	return fmt.Sprintf(
+		"OID %s %c [%d]OID {...}",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.id), tcell.ColorAqua),
+		tview.Borders.Vertical,
+		len(r.ids),
+	)
+}

cmd/frostfs-lens/internal/schema/metabase/records/types.go

@@ -0,0 +1,82 @@
+package records
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/checksum"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/google/uuid"
+)
+
+type (
+	GraveyardRecord struct {
+		object, tombstone oid.Address
+	}
+
+	GarbageRecord struct {
+		addr oid.Address
+	}
+
+	ContainerVolumeRecord struct {
+		id     cid.ID
+		volume uint64
+	}
+
+	LockedRecord struct {
+		id  oid.ID
+		ids []oid.ID
+	}
+
+	ShardInfoRecord struct {
+		label string
+		value string
+	}
+
+	ObjectRecord struct {
+		id     oid.ID
+		object objectSDK.Object
+	}
+
+	SmallRecord struct {
+		id        oid.ID
+		storageID *string // optional
+	}
+
+	RootRecord struct {
+		id   oid.ID
+		info *objectSDK.SplitInfo // optional
+	}
+
+	OwnerRecord struct {
+		id oid.ID
+	}
+
+	UserAttributeRecord struct {
+		id oid.ID
+	}
+
+	PayloadHashRecord struct {
+		checksum checksum.Checksum
+		ids      []oid.ID
+	}
+
+	ParentRecord struct {
+		parent oid.ID
+		ids    []oid.ID
+	}
+
+	SplitRecord struct {
+		id  uuid.UUID
+		ids []oid.ID
+	}
+
+	ContainerCountersRecord struct {
+		id                      cid.ID
+		logical, physical, user uint64
+	}
+
+	ECInfoRecord struct {
+		id  oid.ID
+		ids []oid.ID
+	}
+)

cmd/frostfs-lens/internal/schema/metabase/records/util.go

@@ -0,0 +1,20 @@
+package records
+
+import (
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/nspcc-dev/neo-go/pkg/io"
+)
+
+func DecodeOIDs(data []byte) ([]oid.ID, error) {
+	r := io.NewBinReaderFromBuf(data)
+
+	size := r.ReadVarUint()
+	oids := make([]oid.ID, size)
+
+	for i := uint64(0); i < size; i++ {
+		if err := oids[i].Decode(r.ReadVarBytes()); err != nil {
+			return nil, err
+		}
+	}
+	return oids, nil
+}

cmd/frostfs-lens/internal/schema/writecache/parsers.go

@@ -0,0 +1,63 @@
+package writecache
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"strings"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/mr-tron/base58"
+)
+
+var WritecacheParser = common.WithFallback(
+	DefaultBucketParser,
+	common.RawParser.ToFallbackParser(),
+)
+
+func DefaultBucketParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	if value != nil {
+		return nil, nil, errors.New("not a bucket")
+	}
+	if !bytes.Equal(key, []byte{0}) {
+		return nil, nil, errors.New("invalid key")
+	}
+	return &DefaultBucket{}, DefaultRecordParser, nil
+}
+
+func DefaultRecordParser(key, value []byte) (common.SchemaEntry, common.Parser, error) {
+	parts := strings.Split(string(key), "/")
+
+	if len(parts) != 2 {
+		return nil, nil, errors.New("invalid key, expected address string <CID>/<OID>")
+	}
+
+	cnrRaw, err := base58.Decode(parts[0])
+	if err != nil {
+		return nil, nil, errors.New("can't decode CID string")
+	}
+	objRaw, err := base58.Decode(parts[1])
+	if err != nil {
+		return nil, nil, errors.New("can't decode OID string")
+	}
+
+	cnr := cid.ID{}
+	if err := cnr.Decode(cnrRaw); err != nil {
+		return nil, nil, fmt.Errorf("can't decode CID: %w", err)
+	}
+	obj := oid.ID{}
+	if err := obj.Decode(objRaw); err != nil {
+		return nil, nil, fmt.Errorf("can't decode OID: %w", err)
+	}
+
+	var r DefaultRecord
+
+	r.addr.SetContainer(cnr)
+	r.addr.SetObject(obj)
+
+	r.data = value[:]
+
+	return &r, nil, nil
+}

cmd/frostfs-lens/internal/schema/writecache/types.go

@@ -0,0 +1,66 @@
+package writecache
+
+import (
+	"fmt"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/davecgh/go-spew/spew"
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+type (
+	DefaultBucket struct{}
+
+	DefaultRecord struct {
+		addr oid.Address
+		data []byte
+	}
+)
+
+func (b *DefaultBucket) String() string {
+	return common.FormatSimple("0 Default", tcell.ColorLime)
+}
+
+func (r *DefaultRecord) String() string {
+	return fmt.Sprintf(
+		"CID %s OID %s %c Data {...}",
+		common.FormatSimple(fmt.Sprintf("%-44s", r.addr.Container()), tcell.ColorAqua),
+		common.FormatSimple(fmt.Sprintf("%-44s", r.addr.Object()), tcell.ColorAqua),
+		tview.Borders.Vertical,
+	)
+}
+
+func (b *DefaultBucket) DetailedString() string {
+	return spew.Sdump(*b)
+}
+
+func (r *DefaultRecord) DetailedString() string {
+	return spew.Sdump(*r)
+}
+
+func (b *DefaultBucket) Filter(typ string, _ any) common.FilterResult {
+	switch typ {
+	case "cid":
+		return common.Maybe
+	case "oid":
+		return common.Maybe
+	default:
+		return common.No
+	}
+}
+
+func (r *DefaultRecord) Filter(typ string, val any) common.FilterResult {
+	switch typ {
+	case "cid":
+		id := val.(cid.ID)
+		return common.IfThenElse(r.addr.Container().Equals(id), common.Yes, common.No)
+	case "oid":
+		id := val.(oid.ID)
+		return common.IfThenElse(r.addr.Object().Equals(id), common.Yes, common.No)
+	default:
+		return common.No
+	}
+}

cmd/frostfs-lens/internal/tui/buckets.go

@@ -0,0 +1,257 @@
+package tui
+
+import (
+	"context"
+	"sync"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+type BucketsView struct {
+	*tview.Box
+
+	mu sync.Mutex
+
+	view         *tview.TreeView
+	nodeToUpdate *tview.TreeNode
+
+	ui     *UI
+	filter *Filter
+}
+
+type bucketNode struct {
+	bucket *Bucket
+	filter *Filter
+}
+
+func NewBucketsView(ui *UI, filter *Filter) *BucketsView {
+	return &BucketsView{
+		Box:    tview.NewBox(),
+		view:   tview.NewTreeView(),
+		ui:     ui,
+		filter: filter,
+	}
+}
+
+func (v *BucketsView) Mount(_ context.Context) error {
+	root := tview.NewTreeNode(".")
+	root.SetExpanded(false)
+	root.SetSelectable(false)
+	root.SetReference(&bucketNode{
+		bucket: &Bucket{NextParser: v.ui.rootParser},
+		filter: v.filter,
+	})
+
+	v.nodeToUpdate = root
+
+	v.view.SetRoot(root)
+	v.view.SetCurrentNode(root)
+
+	return nil
+}
+
+func (v *BucketsView) Update(ctx context.Context) error {
+	if v.nodeToUpdate == nil {
+		return nil
+	}
+	defer func() { v.nodeToUpdate = nil }()
+
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	ready := make(chan struct{})
+	errCh := make(chan error)
+
+	tmp := tview.NewTreeNode(v.nodeToUpdate.GetText())
+	tmp.SetReference(v.nodeToUpdate.GetReference())
+
+	node := v.nodeToUpdate.GetReference().(*bucketNode)
+
+	go func() {
+		defer close(ready)
+
+		hasBuckets, err := HasBuckets(ctx, v.ui.db, node.bucket.Path)
+		if err != nil {
+			errCh <- err
+		}
+
+		// Show the selected bucket's records instead.
+		if !hasBuckets && node.bucket.NextParser != nil {
+			v.ui.moveNextPage(NewRecordsView(v.ui, node.bucket, node.filter))
+		}
+
+		if v.nodeToUpdate.IsExpanded() {
+			return
+		}
+
+		err = v.loadNodeChildren(ctx, tmp, node.filter)
+		if err != nil {
+			errCh <- err
+		}
+	}()
+
+	select {
+	case <-ctx.Done():
+	case <-ready:
+		v.mu.Lock()
+		v.nodeToUpdate.SetChildren(tmp.GetChildren())
+		v.nodeToUpdate.SetExpanded(!v.nodeToUpdate.IsExpanded())
+		v.mu.Unlock()
+	case err := <-errCh:
+		return err
+	}
+
+	return nil
+}
+
+func (v *BucketsView) Unmount() {
+}
+
+func (v *BucketsView) Draw(screen tcell.Screen) {
+	x, y, width, height := v.GetInnerRect()
+	v.view.SetRect(x, y, width, height)
+
+	v.view.Draw(screen)
+}
+
+func (v *BucketsView) loadNodeChildren(
+	ctx context.Context, node *tview.TreeNode, filter *Filter,
+) error {
+	parentBucket := node.GetReference().(*bucketNode).bucket
+
+	path := parentBucket.Path
+	parser := parentBucket.NextParser
+
+	buffer, err := LoadBuckets(ctx, v.ui.db, path, v.ui.loadBufferSize)
+	if err != nil {
+		return err
+	}
+
+	for item := range buffer {
+		if item.err != nil {
+			return item.err
+		}
+		bucket := item.val
+
+		bucket.Entry, bucket.NextParser, err = parser(bucket.Name, nil)
+		if err != nil {
+			return err
+		}
+
+		satisfies, err := v.bucketSatisfiesFilter(ctx, bucket, filter)
+		if err != nil {
+			return err
+		}
+		if !satisfies {
+			continue
+		}
+
+		child := tview.NewTreeNode(bucket.Entry.String()).
+			SetSelectable(true).
+			SetExpanded(false).
+			SetReference(&bucketNode{
+				bucket: bucket,
+				filter: filter.Apply(bucket.Entry),
+			})
+
+		node.AddChild(child)
+	}
+
+	return nil
+}
+
+func (v *BucketsView) bucketSatisfiesFilter(
+	ctx context.Context, bucket *Bucket, filter *Filter,
+) (bool, error) {
+	// Does the current bucket satisfies the filter?
+	filter = filter.Apply(bucket.Entry)
+
+	if filter.Result() == common.Yes {
+		return true, nil
+	}
+
+	if filter.Result() == common.No {
+		return false, nil
+	}
+
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	// Check the current bucket's nested buckets if exist
+	bucketsBuffer, err := LoadBuckets(ctx, v.ui.db, bucket.Path, v.ui.loadBufferSize)
+	if err != nil {
+		return false, err
+	}
+
+	for item := range bucketsBuffer {
+		if item.err != nil {
+			return false, item.err
+		}
+		b := item.val
+
+		b.Entry, b.NextParser, err = bucket.NextParser(b.Name, nil)
+		if err != nil {
+			return false, err
+		}
+
+		satisfies, err := v.bucketSatisfiesFilter(ctx, b, filter)
+		if err != nil {
+			return false, err
+		}
+		if satisfies {
+			return true, nil
+		}
+	}
+
+	// Check the current bucket's nested records if exist
+	recordsBuffer, err := LoadRecords(ctx, v.ui.db, bucket.Path, v.ui.loadBufferSize)
+	if err != nil {
+		return false, err
+	}
+
+	for item := range recordsBuffer {
+		if item.err != nil {
+			return false, item.err
+		}
+		r := item.val
+
+		r.Entry, _, err = bucket.NextParser(r.Key, r.Value)
+		if err != nil {
+			return false, err
+		}
+
+		if filter.Apply(r.Entry).Result() == common.Yes {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+func (v *BucketsView) InputHandler() func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {
+	return v.WrapInputHandler(func(event *tcell.EventKey, _ func(tview.Primitive)) {
+		currentNode := v.view.GetCurrentNode()
+		if currentNode == nil {
+			return
+		}
+
+		switch event.Key() {
+		case tcell.KeyEnter:
+			// Expand or collapse the selected bucket's nested buckets,
+			// otherwise, navigate to that bucket's records.
+			v.nodeToUpdate = currentNode
+		case tcell.KeyCtrlR:
+			// Navigate to the selected bucket's records.
+			bucketNode := currentNode.GetReference().(*bucketNode)
+			v.ui.moveNextPage(NewRecordsView(v.ui, bucketNode.bucket, bucketNode.filter))
+		case tcell.KeyCtrlD:
+			// Navigate to the selected bucket's detailed view.
+			bucketNode := currentNode.GetReference().(*bucketNode)
+			v.ui.moveNextPage(NewDetailedView(bucketNode.bucket.Entry.DetailedString()))
+		default:
+			v.view.InputHandler()(event, func(tview.Primitive) {})
+		}
+	})
+}

cmd/frostfs-lens/internal/tui/db.go

@@ -0,0 +1,160 @@
+package tui
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"go.etcd.io/bbolt"
+)
+
+type Item[T any] struct {
+	val T
+	err error
+}
+
+func resolvePath(tx *bbolt.Tx, path [][]byte) (*bbolt.Bucket, error) {
+	if len(path) == 0 {
+		return nil, errors.New("can't find bucket without path")
+	}
+
+	name := path[0]
+	bucket := tx.Bucket(name)
+	if bucket == nil {
+		return nil, fmt.Errorf("no bucket with name %s", name)
+	}
+	for _, name := range path[1:] {
+		bucket = bucket.Bucket(name)
+		if bucket == nil {
+			return nil, fmt.Errorf("no bucket with name %s", name)
+		}
+	}
+	return bucket, nil
+}
+
+func load[T any](
+	ctx context.Context, db *bbolt.DB, path [][]byte, bufferSize int,
+	filter func(key, value []byte) bool, transform func(key, value []byte) T,
+) (<-chan Item[T], error) {
+	buffer := make(chan Item[T], bufferSize)
+
+	go func() {
+		defer close(buffer)
+
+		err := db.View(func(tx *bbolt.Tx) error {
+			var cursor *bbolt.Cursor
+			if len(path) == 0 {
+				cursor = tx.Cursor()
+			} else {
+				bucket, err := resolvePath(tx, path)
+				if err != nil {
+					buffer <- Item[T]{err: fmt.Errorf("can't find bucket: %w", err)}
+					return nil
+				}
+				cursor = bucket.Cursor()
+			}
+
+			key, value := cursor.First()
+			for {
+				if key == nil {
+					return nil
+				}
+				if filter != nil && !filter(key, value) {
+					key, value = cursor.Next()
+					continue
+				}
+
+				select {
+				case <-ctx.Done():
+					return nil
+				case buffer <- Item[T]{val: transform(key, value)}:
+					key, value = cursor.Next()
+				}
+			}
+		})
+		if err != nil {
+			buffer <- Item[T]{err: err}
+		}
+	}()
+
+	return buffer, nil
+}
+
+func LoadBuckets(
+	ctx context.Context, db *bbolt.DB, path [][]byte, bufferSize int,
+) (<-chan Item[*Bucket], error) {
+	buffer, err := load(
+		ctx, db, path, bufferSize,
+		func(_, value []byte) bool {
+			return value == nil
+		},
+		func(key, _ []byte) *Bucket {
+			base := make([][]byte, 0, len(path))
+			base = append(base, path...)
+
+			return &Bucket{
+				Name: key,
+				Path: append(base, key),
+			}
+		},
+	)
+	if err != nil {
+		return nil, fmt.Errorf("can't start iterating bucket: %w", err)
+	}
+
+	return buffer, nil
+}
+
+func LoadRecords(
+	ctx context.Context, db *bbolt.DB, path [][]byte, bufferSize int,
+) (<-chan Item[*Record], error) {
+	buffer, err := load(
+		ctx, db, path, bufferSize,
+		func(_, value []byte) bool {
+			return value != nil
+		},
+		func(key, value []byte) *Record {
+			base := make([][]byte, 0, len(path))
+			base = append(base, path...)
+
+			return &Record{
+				Key:   key,
+				Value: value,
+				Path:  append(base, key),
+			}
+		},
+	)
+	if err != nil {
+		return nil, fmt.Errorf("can't start iterating bucket: %w", err)
+	}
+
+	return buffer, nil
+}
+
+// HasBuckets checks if a bucket has nested buckets. It relies on assumption
+// that a bucket can have either nested buckets or records but not both.
+func HasBuckets(ctx context.Context, db *bbolt.DB, path [][]byte) (bool, error) {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	buffer, err := load(
+		ctx, db, path, 1,
+		nil,
+		func(_, value []byte) []byte { return value },
+	)
+	if err != nil {
+		return false, err
+	}
+
+	x, ok := <-buffer
+	if !ok {
+		return false, nil
+	}
+	if x.err != nil {
+		return false, err
+	}
+	if x.val != nil {
+		return false, err
+	}
+	return true, nil
+}

cmd/frostfs-lens/internal/tui/detailed.go

@@ -0,0 +1,24 @@
+package tui
+
+import (
+	"context"
+
+	"github.com/rivo/tview"
+)
+
+type DetailedView struct {
+	*tview.TextView
+}
+
+func NewDetailedView(detailed string) *DetailedView {
+	v := &DetailedView{
+		TextView: tview.NewTextView(),
+	}
+	v.SetDynamicColors(true)
+	v.SetText(detailed)
+	return v
+}
+
+func (v *DetailedView) Mount(_ context.Context) error  { return nil }
+func (v *DetailedView) Update(_ context.Context) error { return nil }
+func (v *DetailedView) Unmount()                       {}

cmd/frostfs-lens/internal/tui/filter.go

@@ -0,0 +1,44 @@
+package tui
+
+import (
+	"maps"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+)
+
+type Filter struct {
+	values  map[string]any
+	results map[string]common.FilterResult
+}
+
+func NewFilter(values map[string]any) *Filter {
+	f := &Filter{
+		values:  maps.Clone(values),
+		results: make(map[string]common.FilterResult),
+	}
+	for tag := range values {
+		f.results[tag] = common.No
+	}
+	return f
+}
+
+func (f *Filter) Apply(e common.SchemaEntry) *Filter {
+	filter := &Filter{
+		values:  f.values,
+		results: maps.Clone(f.results),
+	}
+
+	for tag, value := range filter.values {
+		filter.results[tag] = max(filter.results[tag], e.Filter(tag, value))
+	}
+
+	return filter
+}
+
+func (f *Filter) Result() common.FilterResult {
+	current := common.Yes
+	for _, r := range f.results {
+		current = min(r, current)
+	}
+	return current
+}

cmd/frostfs-lens/internal/tui/help-pages/hotkeys.txt

@@ -0,0 +1,38 @@
+[green::b]HOTKEYS[-::-]
+
+    [green::b]Navigation[-::-]
+
+        [yellow::b]Down Arrow[-::-] / [yellow::b]j[-::-]
+            Scroll down.
+
+        [yellow::b]Up Arrow[-::-] / [yellow::b]k[-::-]
+            Scroll up.
+
+        [yellow::b]Page Down[-::-] / [yellow::b]Ctrl-f[-::-]
+            Scroll down by a full page.
+
+        [yellow::b]Page Up[-::-] / [yellow::b]Ctrl-b[-::-]
+            Scroll up by a full page.
+
+    [green::b]Actions[-::-]
+
+        [yellow::b]Enter[-::-]
+            Perform actions based on the current context:
+            - In Buckets View:
+                - Expand/collapse the selected bucket to show/hide its nested buckets.
+                - If no nested buckets exist, navigate to the selected bucket's records.
+            - In Records View: Open the detailed view of the selected record.
+
+        [yellow::b]Escape[-::-]
+            Return to the previous page, opposite of [yellow::b]Enter[-::-].
+
+        Refer to the [green::b]SEARCHING[-::-] section for more specific actions.
+
+
+    [green::b]Alternative Action Hotkeys[-::-]
+
+        [yellow::b]Ctrl-r[-::-]
+            Directly navigate to the selected bucket's records.
+
+        [yellow::b]Ctrl-d[-::-]
+            Access the detailed view of the selected bucket.

cmd/frostfs-lens/internal/tui/help-pages/searching.txt

@@ -0,0 +1,26 @@
+[green::b]SEARCHING[-::-]
+
+	[green::b]Hotkeys[-::-]
+
+		[yellow::b]/[-::-]
+			Initiate the search prompt.
+			- The prompt follows this syntax: [yellow::b]tag:value [+ tag:value]...[-::-]
+			- Multiple filter can be combined with [yellow::b]+[-::-], the result is an intersection of those filters' result sets.
+			- Any leading and trailing whitespace will be ignored.
+			- An empty prompt will return all results with no filters applied.
+			- Refer to the [green::b]Available Search Filters[-::-] section below for a list of valid filter tags.
+
+		[yellow::b]Enter[-::-]
+			Execute the search based on the entered prompt.
+			- If the prompt is invalid, an error message will be displayed.
+
+		[yellow::b]Escape[-::-]
+			Exit the search prompt without performing a search.
+
+		[yellow::b]Down Arrow[-::-], [yellow::b]Up Arrow[-::-]
+			Scroll through the search history.
+
+
+	[green::b]Available Search Filters[-::-]
+
+%s

cmd/frostfs-lens/internal/tui/help.go

@@ -0,0 +1,101 @@
+package tui
+
+import (
+	_ "embed"
+	"fmt"
+	"strings"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+var (
+	//go:embed help-pages/hotkeys.txt
+	hotkeysHelpText string
+
+	//go:embed help-pages/searching.txt
+	searchingHelpText string
+)
+
+type HelpPage struct {
+	*tview.Box
+	pages       []*tview.TextView
+	currentPage int
+
+	filters     []string
+	filterHints map[string]string
+}
+
+func NewHelpPage(filters []string, hints map[string]string) *HelpPage {
+	hp := &HelpPage{
+		Box:         tview.NewBox(),
+		filters:     filters,
+		filterHints: hints,
+	}
+
+	page := tview.NewTextView().
+		SetDynamicColors(true).
+		SetText(hotkeysHelpText)
+	hp.addPage(page)
+
+	page = tview.NewTextView().
+		SetDynamicColors(true).
+		SetText(fmt.Sprintf(searchingHelpText, hp.getFiltersText()))
+	hp.addPage(page)
+
+	return hp
+}
+
+func (hp *HelpPage) addPage(page *tview.TextView) {
+	hp.pages = append(hp.pages, page)
+}
+
+func (hp *HelpPage) getFiltersText() string {
+	if len(hp.filters) == 0 {
+		return "\t\tNo filters defined.\n"
+	}
+
+	filtersText := strings.Builder{}
+	gapSize := 4
+
+	tagMaxWidth := 3
+	for _, filter := range hp.filters {
+		tagMaxWidth = max(tagMaxWidth, len(filter))
+	}
+	filtersText.WriteString("\t\t[yellow::b]Tag")
+	filtersText.WriteString(strings.Repeat(" ", gapSize))
+	filtersText.WriteString("\tValue[-::-]\n\n")
+
+	for _, filter := range hp.filters {
+		filtersText.WriteString("\t\t")
+		filtersText.WriteString(filter)
+		filtersText.WriteString(strings.Repeat(" ", tagMaxWidth-len(filter)+gapSize))
+		filtersText.WriteString(hp.filterHints[filter])
+		filtersText.WriteRune('\n')
+	}
+
+	return filtersText.String()
+}
+
+func (hp *HelpPage) Draw(screen tcell.Screen) {
+	x, y, width, height := hp.GetInnerRect()
+	hp.pages[hp.currentPage].SetRect(x+1, y+1, width-2, height-2)
+	hp.pages[hp.currentPage].Draw(screen)
+}
+
+func (hp *HelpPage) InputHandler() func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {
+	return hp.WrapInputHandler(func(event *tcell.EventKey, _ func(tview.Primitive)) {
+		if event.Key() == tcell.KeyEnter {
+			hp.currentPage++
+			hp.currentPage %= len(hp.pages)
+			return
+		}
+		hp.pages[hp.currentPage].InputHandler()(event, func(tview.Primitive) {})
+	})
+}
+
+func (hp *HelpPage) MouseHandler() func(action tview.MouseAction, event *tcell.EventMouse, setFocus func(p tview.Primitive)) (consumed bool, capture tview.Primitive) {
+	return hp.WrapMouseHandler(func(action tview.MouseAction, event *tcell.EventMouse, _ func(tview.Primitive)) (consumed bool, capture tview.Primitive) {
+		return hp.pages[hp.currentPage].MouseHandler()(action, event, func(tview.Primitive) {})
+	})
+}

cmd/frostfs-lens/internal/tui/input.go

@@ -0,0 +1,77 @@
+package tui
+
+import (
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+type InputFieldWithHistory struct {
+	*tview.InputField
+	history        []string
+	historyLimit   int
+	historyPointer int
+	currentContent string
+}
+
+func NewInputFieldWithHistory(historyLimit int) *InputFieldWithHistory {
+	return &InputFieldWithHistory{
+		InputField:   tview.NewInputField(),
+		historyLimit: historyLimit,
+	}
+}
+
+func (f *InputFieldWithHistory) AddToHistory(s string) {
+	// Stop scrolling history on history change, need to start scrolling again.
+	defer func() { f.historyPointer = len(f.history) }()
+
+	// Used history data for search prompt, so just make that data recent.
+	if f.historyPointer != len(f.history) && s == f.history[f.historyPointer] {
+		f.history = append(f.history[:f.historyPointer], f.history[f.historyPointer+1:]...)
+		f.history = append(f.history, s)
+	}
+
+	if len(f.history) == f.historyLimit {
+		f.history = f.history[1:]
+	}
+	f.history = append(f.history, s)
+}
+
+func (f *InputFieldWithHistory) InputHandler() func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {
+	return f.WrapInputHandler(func(event *tcell.EventKey, _ func(tview.Primitive)) {
+		switch event.Key() {
+		case tcell.KeyDown:
+			if len(f.history) == 0 {
+				return
+			}
+			// Need to start iterating before.
+			if f.historyPointer == len(f.history) {
+				return
+			}
+			// Iterate to most recent prompts.
+			f.historyPointer++
+			// Stop iterating over history.
+			if f.historyPointer == len(f.history) {
+				f.InputField.SetText(f.currentContent)
+				return
+			}
+			f.InputField.SetText(f.history[f.historyPointer])
+		case tcell.KeyUp:
+			if len(f.history) == 0 {
+				return
+			}
+			// Start iterating over history.
+			if f.historyPointer == len(f.history) {
+				f.currentContent = f.InputField.GetText()
+			}
+			// End of history.
+			if f.historyPointer == 0 {
+				return
+			}
+			// Iterate to least recent prompts.
+			f.historyPointer--
+			f.InputField.SetText(f.history[f.historyPointer])
+		default:
+			f.InputField.InputHandler()(event, func(tview.Primitive) {})
+		}
+	})
+}

cmd/frostfs-lens/internal/tui/loading.go

@@ -0,0 +1,72 @@
+package tui
+
+import (
+	"context"
+	"fmt"
+	"sync/atomic"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+type LoadingBar struct {
+	*tview.Box
+	view           *tview.TextView
+	secondsElapsed atomic.Int64
+	needDrawFunc   func()
+	reset          func()
+}
+
+func NewLoadingBar(needDrawFunc func()) *LoadingBar {
+	b := &LoadingBar{
+		Box:          tview.NewBox(),
+		view:         tview.NewTextView(),
+		needDrawFunc: needDrawFunc,
+	}
+	b.view.SetBackgroundColor(tview.Styles.PrimaryTextColor)
+	b.view.SetTextColor(b.GetBackgroundColor())
+
+	return b
+}
+
+func (b *LoadingBar) Start(ctx context.Context) {
+	ctx, b.reset = context.WithCancel(ctx)
+
+	go func() {
+		ticker := time.NewTicker(1 * time.Second)
+		defer ticker.Stop()
+
+		b.secondsElapsed.Store(0)
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-ticker.C:
+				b.secondsElapsed.Add(1)
+				b.needDrawFunc()
+			}
+		}
+	}()
+}
+
+func (b *LoadingBar) Stop() {
+	b.reset()
+}
+
+func (b *LoadingBar) Draw(screen tcell.Screen) {
+	seconds := b.secondsElapsed.Load()
+
+	var time string
+	switch {
+	case seconds < 60:
+		time = fmt.Sprintf("%ds", seconds)
+	default:
+		time = fmt.Sprintf("%dm%ds", seconds/60, seconds%60)
+	}
+	b.view.SetText(fmt.Sprintf(" Loading... %s (press Escape to cancel) ", time))
+
+	x, y, width, _ := b.GetInnerRect()
+	b.view.SetRect(x, y, width, 1)
+	b.view.Draw(screen)
+}

cmd/frostfs-lens/internal/tui/records.go

@@ -0,0 +1,271 @@
+package tui
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"math"
+	"sync"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+type updateType int
+
+const (
+	other updateType = iota
+	moveToPrevPage
+	moveToNextPage
+	moveUp
+	moveDown
+	moveHome
+	moveEnd
+)
+
+type RecordsView struct {
+	*tview.Box
+
+	mu sync.RWMutex
+
+	onUnmount func()
+
+	bucket  *Bucket
+	records []*Record
+
+	buffer chan *Record
+
+	firstRecordIndex    int
+	lastRecordIndex     int
+	selectedRecordIndex int
+
+	updateType updateType
+
+	ui     *UI
+	filter *Filter
+}
+
+func NewRecordsView(ui *UI, bucket *Bucket, filter *Filter) *RecordsView {
+	return &RecordsView{
+		Box:    tview.NewBox(),
+		bucket: bucket,
+		ui:     ui,
+		filter: filter,
+	}
+}
+
+func (v *RecordsView) Mount(ctx context.Context) error {
+	if v.onUnmount != nil {
+		return errors.New("try to mount already mounted component")
+	}
+
+	ctx, v.onUnmount = context.WithCancel(ctx)
+
+	tempBuffer, err := LoadRecords(ctx, v.ui.db, v.bucket.Path, v.ui.loadBufferSize)
+	if err != nil {
+		return err
+	}
+
+	v.buffer = make(chan *Record, v.ui.loadBufferSize)
+	go func() {
+		defer close(v.buffer)
+
+		for item := range tempBuffer {
+			if item.err != nil {
+				v.ui.stopOnError(err)
+				break
+			}
+			record := item.val
+
+			record.Entry, _, err = v.bucket.NextParser(record.Key, record.Value)
+			if err != nil {
+				v.ui.stopOnError(err)
+				break
+			}
+
+			if v.filter.Apply(record.Entry).Result() != common.Yes {
+				continue
+			}
+
+			v.buffer <- record
+		}
+	}()
+
+	return nil
+}
+
+func (v *RecordsView) Unmount() {
+	if v.onUnmount == nil {
+		panic("try to unmount not mounted component")
+	}
+	v.onUnmount()
+	v.onUnmount = nil
+}
+
+func (v *RecordsView) Update(ctx context.Context) error {
+	_, _, _, recordsPerPage := v.GetInnerRect()
+	firstRecordIndex, lastRecordIndex, selectedRecordIndex := v.getNewIndexes()
+
+loop:
+	for len(v.records) < lastRecordIndex {
+		select {
+		case <-ctx.Done():
+			return nil
+		case record, ok := <-v.buffer:
+			if !ok {
+				break loop
+			}
+			v.records = append(v.records, record)
+		}
+	}
+
+	// Set the update type to its default value after some specific key event
+	// has been handled.
+	v.updateType = other
+
+	firstRecordIndex = max(0, min(firstRecordIndex, len(v.records)-recordsPerPage))
+	lastRecordIndex = min(firstRecordIndex+recordsPerPage, len(v.records))
+	selectedRecordIndex = min(selectedRecordIndex, lastRecordIndex-1)
+
+	v.mu.Lock()
+	v.firstRecordIndex = firstRecordIndex
+	v.lastRecordIndex = lastRecordIndex
+	v.selectedRecordIndex = selectedRecordIndex
+	v.mu.Unlock()
+
+	return nil
+}
+
+func (v *RecordsView) getNewIndexes() (int, int, int) {
+	v.mu.RLock()
+	firstRecordIndex := v.firstRecordIndex
+	lastRecordIndex := v.lastRecordIndex
+	selectedRecordIndex := v.selectedRecordIndex
+	v.mu.RUnlock()
+
+	_, _, _, recordsPerPage := v.GetInnerRect()
+
+	switch v.updateType {
+	case moveUp:
+		if selectedRecordIndex != firstRecordIndex {
+			selectedRecordIndex--
+			break
+		}
+		firstRecordIndex = max(0, firstRecordIndex-1)
+		lastRecordIndex = min(firstRecordIndex+recordsPerPage, len(v.records))
+		selectedRecordIndex = firstRecordIndex
+	case moveToPrevPage:
+		if selectedRecordIndex != firstRecordIndex {
+			selectedRecordIndex = firstRecordIndex
+			break
+		}
+		firstRecordIndex = max(0, firstRecordIndex-recordsPerPage)
+		lastRecordIndex = firstRecordIndex + recordsPerPage
+		selectedRecordIndex = firstRecordIndex
+	case moveDown:
+		if selectedRecordIndex != lastRecordIndex-1 {
+			selectedRecordIndex++
+			break
+		}
+		firstRecordIndex++
+		lastRecordIndex++
+		selectedRecordIndex++
+	case moveToNextPage:
+		if selectedRecordIndex != lastRecordIndex-1 {
+			selectedRecordIndex = lastRecordIndex - 1
+			break
+		}
+		firstRecordIndex += recordsPerPage
+		lastRecordIndex = firstRecordIndex + recordsPerPage
+		selectedRecordIndex = lastRecordIndex - 1
+	case moveHome:
+		firstRecordIndex = 0
+		lastRecordIndex = firstRecordIndex + recordsPerPage
+		selectedRecordIndex = 0
+	case moveEnd:
+		lastRecordIndex = math.MaxInt32
+		firstRecordIndex = lastRecordIndex - recordsPerPage
+		selectedRecordIndex = lastRecordIndex - 1
+	default:
+		lastRecordIndex = firstRecordIndex + recordsPerPage
+	}
+
+	return firstRecordIndex, lastRecordIndex, selectedRecordIndex
+}
+
+func (v *RecordsView) GetInnerRect() (int, int, int, int) {
+	x, y, width, height := v.Box.GetInnerRect()
+
+	// Left padding.
+	x = min(x+3, x+width-1)
+	width = max(width-3, 0)
+
+	return x, y, width, height
+}
+
+func (v *RecordsView) Draw(screen tcell.Screen) {
+	v.mu.RLock()
+	firstRecordIndex := v.firstRecordIndex
+	lastRecordIndex := v.lastRecordIndex
+	selectedRecordIndex := v.selectedRecordIndex
+	records := v.records
+	v.mu.RUnlock()
+
+	v.DrawForSubclass(screen, v)
+
+	x, y, width, height := v.GetInnerRect()
+	if height == 0 {
+		return
+	}
+
+	// No records in that bucket.
+	if firstRecordIndex == lastRecordIndex {
+		tview.Print(
+			screen, "Empty Bucket", x, y, width, tview.AlignCenter, tview.Styles.PrimaryTextColor,
+		)
+		return
+	}
+
+	for index := firstRecordIndex; index < lastRecordIndex; index++ {
+		result := records[index].Entry
+		text := result.String()
+
+		if index == selectedRecordIndex {
+			text = fmt.Sprintf("[:white]%s[:-]", text)
+			tview.Print(screen, text, x, y, width, tview.AlignLeft, tview.Styles.PrimitiveBackgroundColor)
+		} else {
+			tview.Print(screen, text, x, y, width, tview.AlignLeft, tview.Styles.PrimaryTextColor)
+		}
+
+		y++
+	}
+}
+
+func (v *RecordsView) InputHandler() func(event *tcell.EventKey, _ func(p tview.Primitive)) {
+	return v.WrapInputHandler(func(event *tcell.EventKey, _ func(p tview.Primitive)) {
+		switch m, k := event.Modifiers(), event.Key(); {
+		case m == 0 && k == tcell.KeyPgUp:
+			v.updateType = moveToPrevPage
+		case m == 0 && k == tcell.KeyPgDn:
+			v.updateType = moveToNextPage
+		case m == 0 && k == tcell.KeyUp:
+			v.updateType = moveUp
+		case m == 0 && k == tcell.KeyDown:
+			v.updateType = moveDown
+		case m == 0 && k == tcell.KeyHome:
+			v.updateType = moveHome
+		case m == 0 && k == tcell.KeyEnd:
+			v.updateType = moveEnd
+		case k == tcell.KeyEnter:
+			v.mu.RLock()
+			selectedRecordIndex := v.selectedRecordIndex
+			records := v.records
+			v.mu.RUnlock()
+			if len(records) != 0 {
+				current := records[selectedRecordIndex]
+				v.ui.moveNextPage(NewDetailedView(current.Entry.DetailedString()))
+			}
+		}
+	})
+}

cmd/frostfs-lens/internal/tui/types.go

@@ -0,0 +1,18 @@
+package tui
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+)
+
+type Bucket struct {
+	Name       []byte
+	Path       [][]byte
+	Entry      common.SchemaEntry
+	NextParser common.Parser
+}
+
+type Record struct {
+	Key, Value []byte
+	Path       [][]byte
+	Entry      common.SchemaEntry
+}

cmd/frostfs-lens/internal/tui/ui.go

@@ -0,0 +1,561 @@
+package tui
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+	"sync/atomic"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/common"
+	"github.com/davecgh/go-spew/spew"
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+	"go.etcd.io/bbolt"
+)
+
+type Config struct {
+	LoadBufferSize      int
+	SearchHistorySize   int
+	LoadingIndicatorLag time.Duration
+}
+
+var DefaultConfig = Config{
+	LoadBufferSize:      100,
+	SearchHistorySize:   100,
+	LoadingIndicatorLag: 500 * time.Millisecond,
+}
+
+type Primitive interface {
+	tview.Primitive
+
+	Mount(ctx context.Context) error
+	Update(ctx context.Context) error
+	Unmount()
+}
+
+type UI struct {
+	*tview.Box
+
+	// Need to use context while updating pages those read data from a database.
+	// Context should be shared among all mount and updates. Current TUI library
+	// doesn't use contexts at all, so I do that feature by myself.
+	//nolint:containedctx
+	ctx    context.Context
+	onStop func()
+
+	app *tview.Application
+	db  *bbolt.DB
+
+	pageHistory []Primitive
+	mountedPage Primitive
+
+	pageToMount Primitive
+
+	pageStub tview.Primitive
+
+	infoBar    *tview.TextView
+	searchBar  *InputFieldWithHistory
+	loadingBar *LoadingBar
+	helpBar    *tview.TextView
+
+	helpPage *HelpPage
+
+	searchErrorBar *tview.TextView
+
+	isSearching    bool
+	isLoading      atomic.Bool
+	isShowingError bool
+	isShowingHelp  bool
+
+	loadBufferSize int
+
+	rootParser common.Parser
+
+	loadingIndicatorLag time.Duration
+
+	cancelLoading func()
+
+	filters          map[string]func(string) (any, error)
+	compositeFilters map[string]func(string) (map[string]any, error)
+	filterHints      map[string]string
+}
+
+func NewUI(
+	ctx context.Context,
+	app *tview.Application,
+	db *bbolt.DB,
+	rootParser common.Parser,
+	cfg *Config,
+) *UI {
+	spew.Config.DisableMethods = true
+
+	if cfg == nil {
+		cfg = &DefaultConfig
+	}
+
+	ui := &UI{
+		Box: tview.NewBox(),
+
+		app:        app,
+		db:         db,
+		rootParser: rootParser,
+
+		filters:          make(map[string]func(string) (any, error)),
+		compositeFilters: make(map[string]func(string) (map[string]any, error)),
+		filterHints:      make(map[string]string),
+
+		loadBufferSize:      cfg.LoadBufferSize,
+		loadingIndicatorLag: cfg.LoadingIndicatorLag,
+	}
+
+	ui.ctx, ui.onStop = context.WithCancel(ctx)
+
+	backgroundColor := ui.GetBackgroundColor()
+	textColor := tview.Styles.PrimaryTextColor
+
+	inverseBackgroundColor := textColor
+	inverseTextColor := backgroundColor
+
+	alertTextColor := tcell.ColorRed
+
+	ui.pageStub = tview.NewBox()
+
+	ui.infoBar = tview.NewTextView()
+	ui.infoBar.SetBackgroundColor(inverseBackgroundColor)
+	ui.infoBar.SetTextColor(inverseTextColor)
+	ui.infoBar.SetText(
+		fmt.Sprintf(" %s (press h for help, q to quit) ", db.Path()),
+	)
+
+	ui.searchBar = NewInputFieldWithHistory(cfg.SearchHistorySize)
+	ui.searchBar.SetFieldBackgroundColor(backgroundColor)
+	ui.searchBar.SetFieldTextColor(textColor)
+	ui.searchBar.SetLabelColor(textColor)
+	ui.searchBar.Focus(nil)
+	ui.searchBar.SetLabel("/")
+
+	ui.searchErrorBar = tview.NewTextView()
+	ui.searchErrorBar.SetBackgroundColor(backgroundColor)
+	ui.searchErrorBar.SetTextColor(alertTextColor)
+
+	ui.helpBar = tview.NewTextView()
+	ui.helpBar.SetBackgroundColor(inverseBackgroundColor)
+	ui.helpBar.SetTextColor(inverseTextColor)
+	ui.helpBar.SetText(" Press Enter for next page or Escape to exit help ")
+
+	ui.loadingBar = NewLoadingBar(ui.triggerDraw)
+
+	ui.pageToMount = NewBucketsView(ui, NewFilter(nil))
+
+	return ui
+}
+
+func (ui *UI) checkFilterExists(typ string) bool {
+	if _, ok := ui.filters[typ]; ok {
+		return true
+	}
+	if _, ok := ui.compositeFilters[typ]; ok {
+		return true
+	}
+	return false
+}
+
+func (ui *UI) AddFilter(
+	typ string,
+	parser func(string) (any, error),
+	helpHint string,
+) error {
+	if ui.checkFilterExists(typ) {
+		return fmt.Errorf("filter %s already exists", typ)
+	}
+	ui.filters[typ] = parser
+	ui.filterHints[typ] = helpHint
+	return nil
+}
+
+func (ui *UI) AddCompositeFilter(
+	typ string,
+	parser func(string) (map[string]any, error),
+	helpHint string,
+) error {
+	if ui.checkFilterExists(typ) {
+		return fmt.Errorf("filter %s already exists", typ)
+	}
+	ui.compositeFilters[typ] = parser
+	ui.filterHints[typ] = helpHint
+	return nil
+}
+
+func (ui *UI) stopOnError(err error) {
+	if err != nil {
+		ui.onStop()
+		ui.app.QueueEvent(tcell.NewEventError(err))
+	}
+}
+
+func (ui *UI) stop() {
+	ui.onStop()
+	ui.app.Stop()
+}
+
+func (ui *UI) movePrevPage() {
+	if len(ui.pageHistory) != 0 {
+		ui.mountedPage.Unmount()
+		ui.mountedPage = ui.pageHistory[len(ui.pageHistory)-1]
+		ui.pageHistory = ui.pageHistory[:len(ui.pageHistory)-1]
+		ui.triggerDraw()
+	}
+}
+
+func (ui *UI) moveNextPage(page Primitive) {
+	ui.pageToMount = page
+	ui.triggerDraw()
+}
+
+func (ui *UI) triggerDraw() {
+	go ui.app.QueueUpdateDraw(func() {})
+}
+
+func (ui *UI) Draw(screen tcell.Screen) {
+	if ui.isLoading.Load() {
+		ui.draw(screen)
+		return
+	}
+
+	ui.isLoading.Store(true)
+
+	ctx, cancel := context.WithCancel(ui.ctx)
+
+	ready := make(chan struct{})
+	go func() {
+		ui.load(ctx)
+
+		cancel()
+		close(ready)
+		ui.isLoading.Store(false)
+	}()
+
+	select {
+	case <-ready:
+	case <-time.After(ui.loadingIndicatorLag):
+		ui.loadingBar.Start(ui.ctx)
+		ui.cancelLoading = cancel
+
+		go func() {
+			<-ready
+			ui.loadingBar.Stop()
+			ui.triggerDraw()
+		}()
+	}
+
+	ui.draw(screen)
+}
+
+func (ui *UI) load(ctx context.Context) {
+	if ui.mountedPage == nil && ui.pageToMount == nil {
+		ui.stop()
+		return
+	}
+
+	if ui.pageToMount != nil {
+		ui.mountAndUpdate(ctx)
+	} else {
+		ui.update(ctx)
+	}
+}
+
+func (ui *UI) draw(screen tcell.Screen) {
+	ui.DrawForSubclass(screen, ui)
+	x, y, width, height := ui.GetInnerRect()
+
+	var (
+		pageToDraw tview.Primitive
+		barToDraw  tview.Primitive
+	)
+
+	switch {
+	case ui.isShowingHelp:
+		if ui.helpPage == nil {
+			var filters []string
+			for f := range ui.filters {
+				filters = append(filters, f)
+			}
+			for f := range ui.compositeFilters {
+				filters = append(filters, f)
+			}
+			ui.helpPage = NewHelpPage(filters, ui.filterHints)
+		}
+		pageToDraw = ui.helpPage
+	case ui.mountedPage != nil:
+		pageToDraw = ui.mountedPage
+	default:
+		pageToDraw = ui.pageStub
+	}
+
+	pageToDraw.SetRect(x, y, width, height-1)
+	pageToDraw.Draw(screen)
+
+	// Search bar uses cursor and we need to hide it when another bar is drawn.
+	screen.HideCursor()
+
+	switch {
+	case ui.isLoading.Load():
+		barToDraw = ui.loadingBar
+	case ui.isSearching:
+		barToDraw = ui.searchBar
+	case ui.isShowingError:
+		barToDraw = ui.searchErrorBar
+	case ui.isShowingHelp:
+		barToDraw = ui.helpBar
+	default:
+		barToDraw = ui.infoBar
+	}
+
+	barToDraw.SetRect(x, y+height-1, width, 1)
+	barToDraw.Draw(screen)
+}
+
+func (ui *UI) mountAndUpdate(ctx context.Context) {
+	defer func() {
+		// Operation succeeded or was canceled, either way reset page to mount.
+		ui.pageToMount = nil
+	}()
+
+	// Mount should use app global context.
+	//nolint:contextcheck
+	err := ui.pageToMount.Mount(ui.ctx)
+	if err != nil {
+		ui.stopOnError(err)
+		return
+	}
+
+	x, y, width, height := ui.GetInnerRect()
+	ui.pageToMount.SetRect(x, y, width, height-1)
+
+	s := loadOp(ctx, ui.pageToMount.Update)
+	if s.err != nil {
+		ui.pageToMount.Unmount()
+		ui.stopOnError(s.err)
+		return
+	}
+	// Update was canceled.
+	if !s.done {
+		ui.pageToMount.Unmount()
+		return
+	}
+
+	if ui.mountedPage != nil {
+		ui.pageHistory = append(ui.pageHistory, ui.mountedPage)
+	}
+	ui.mountedPage = ui.pageToMount
+}
+
+func (ui *UI) update(ctx context.Context) {
+	x, y, width, height := ui.GetInnerRect()
+	ui.mountedPage.SetRect(x, y, width, height-1)
+
+	s := loadOp(ctx, ui.mountedPage.Update)
+	if s.err != nil {
+		ui.stopOnError(s.err)
+		return
+	}
+}
+
+type status struct {
+	done bool
+	err  error
+}
+
+func loadOp(ctx context.Context, op func(ctx context.Context) error) status {
+	errCh := make(chan error)
+	go func() {
+		errCh <- op(ctx)
+	}()
+
+	select {
+	case <-ctx.Done():
+		return status{done: false, err: nil}
+	case err := <-errCh:
+		return status{done: true, err: err}
+	}
+}
+
+func (ui *UI) InputHandler() func(event *tcell.EventKey, setFocus func(p tview.Primitive)) {
+	return ui.WrapInputHandler(func(event *tcell.EventKey, _ func(tview.Primitive)) {
+		switch {
+		case ui.isLoading.Load():
+			ui.handleInputOnLoading(event)
+		case ui.isShowingHelp:
+			ui.handleInputOnShowingHelp(event)
+		case ui.isShowingError:
+			ui.handleInputOnShowingError()
+		case ui.isSearching:
+			ui.handleInputOnSearching(event)
+		default:
+			ui.handleInput(event)
+		}
+	})
+}
+
+func (ui *UI) handleInput(event *tcell.EventKey) {
+	m, k, r := event.Modifiers(), event.Key(), event.Rune()
+
+	switch {
+	case k == tcell.KeyEsc:
+		ui.movePrevPage()
+	case m == 0 && k == tcell.KeyRune && r == 'h':
+		ui.isShowingHelp = true
+	case m == 0 && k == tcell.KeyRune && r == '/':
+		ui.isSearching = true
+	case m == 0 && k == tcell.KeyRune && r == 'q':
+		ui.stop()
+	default:
+		if ui.mountedPage != nil {
+			ui.mountedPage.InputHandler()(event, func(tview.Primitive) {})
+		}
+	}
+}
+
+func (ui *UI) handleInputOnLoading(event *tcell.EventKey) {
+	switch k, r := event.Key(), event.Rune(); {
+	case k == tcell.KeyEsc:
+		ui.cancelLoading()
+	case k == tcell.KeyRune && r == 'q':
+		ui.stop()
+	}
+}
+
+func (ui *UI) handleInputOnShowingError() {
+	ui.isShowingError = false
+	ui.isSearching = true
+}
+
+func (ui *UI) handleInputOnShowingHelp(event *tcell.EventKey) {
+	k, r := event.Key(), event.Rune()
+
+	switch {
+	case k == tcell.KeyEsc:
+		ui.isShowingHelp = false
+	case k == tcell.KeyRune && r == 'q':
+		ui.stop()
+	default:
+		ui.helpPage.InputHandler()(event, func(tview.Primitive) {})
+	}
+}
+
+func (ui *UI) handleInputOnSearching(event *tcell.EventKey) {
+	m, k := event.Modifiers(), event.Key()
+
+	switch {
+	case k == tcell.KeyEnter:
+		prompt := ui.searchBar.GetText()
+
+		res, err := ui.processPrompt(prompt)
+		if err != nil {
+			ui.isShowingError = true
+			ui.isSearching = false
+			ui.searchErrorBar.SetText(err.Error() + " (press any key to continue)")
+			return
+		}
+
+		switch ui.mountedPage.(type) {
+		case *BucketsView:
+			ui.moveNextPage(NewBucketsView(ui, res))
+		case *RecordsView:
+			bucket := ui.mountedPage.(*RecordsView).bucket
+			ui.moveNextPage(NewRecordsView(ui, bucket, res))
+		}
+
+		if ui.searchBar.GetText() != "" {
+			ui.searchBar.AddToHistory(ui.searchBar.GetText())
+		}
+
+		ui.searchBar.SetText("")
+		ui.isSearching = false
+	case k == tcell.KeyEsc:
+		ui.isSearching = false
+	case (k == tcell.KeyBackspace2 || m&tcell.ModCtrl != 0 && k == tcell.KeyETB) && len(ui.searchBar.GetText()) == 0:
+		ui.isSearching = false
+	default:
+		ui.searchBar.InputHandler()(event, func(tview.Primitive) {})
+	}
+
+	ui.Box.MouseHandler()
+}
+
+func (ui *UI) WithPrompt(prompt string) error {
+	filter, err := ui.processPrompt(prompt)
+	if err != nil {
+		return err
+	}
+
+	ui.pageToMount = NewBucketsView(ui, filter)
+
+	if prompt != "" {
+		ui.searchBar.AddToHistory(prompt)
+	}
+
+	return nil
+}
+
+func (ui *UI) processPrompt(prompt string) (filter *Filter, err error) {
+	if prompt == "" {
+		return NewFilter(nil), nil
+	}
+
+	filterMap := make(map[string]any)
+
+	for _, filterString := range strings.Split(prompt, "+") {
+		parts := strings.Split(filterString, ":")
+		if len(parts) != 2 {
+			return nil, errors.New("expected 'tag:value [+ tag:value]...'")
+		}
+
+		filterTag := strings.TrimSpace(parts[0])
+		filterValueString := strings.TrimSpace(parts[1])
+
+		if _, exists := filterMap[filterTag]; exists {
+			return nil, fmt.Errorf("duplicate filter tag '%s'", filterTag)
+		}
+
+		parser, ok := ui.filters[filterTag]
+		if ok {
+			filterValue, err := parser(filterValueString)
+			if err != nil {
+				return nil, fmt.Errorf("can't parse '%s' filter value: %w", filterTag, err)
+			}
+
+			filterMap[filterTag] = filterValue
+			continue
+		}
+
+		compositeParser, ok := ui.compositeFilters[filterTag]
+		if ok {
+			compositeFilterValue, err := compositeParser(filterValueString)
+			if err != nil {
+				return nil, fmt.Errorf(
+					"can't parse '%s' filter value '%s': %w",
+					filterTag, filterValueString, err,
+				)
+			}
+
+			for tag, value := range compositeFilterValue {
+				if _, exists := filterMap[tag]; exists {
+					return nil, fmt.Errorf(
+						"found duplicate filter tag '%s' while processing composite filter with tag '%s'",
+						tag, filterTag,
+					)
+				}
+
+				filterMap[tag] = value
+			}
+			continue
+		}
+
+		return nil, fmt.Errorf("unknown filter tag '%s'", filterTag)
+	}
+
+	return NewFilter(filterMap), nil
+}

cmd/frostfs-lens/internal/tui/util.go

@@ -0,0 +1,97 @@
+package tui
+
+import (
+	"errors"
+	"strings"
+
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/mr-tron/base58"
+)
+
+func CIDParser(s string) (any, error) {
+	data, err := base58.Decode(s)
+	if err != nil {
+		return nil, err
+	}
+	var id cid.ID
+	if err = id.Decode(data); err != nil {
+		return nil, err
+	}
+	return id, nil
+}
+
+func OIDParser(s string) (any, error) {
+	data, err := base58.Decode(s)
+	if err != nil {
+		return nil, err
+	}
+	var id oid.ID
+	if err = id.Decode(data); err != nil {
+		return nil, err
+	}
+	return id, nil
+}
+
+func AddressParser(s string) (map[string]any, error) {
+	m := make(map[string]any)
+
+	parts := strings.Split(s, "/")
+	if len(parts) != 2 {
+		return nil, errors.New("expected <cid>/<oid>")
+	}
+	cnr, err := CIDParser(parts[0])
+	if err != nil {
+		return nil, err
+	}
+	obj, err := OIDParser(parts[1])
+	if err != nil {
+		return nil, err
+	}
+
+	m["cid"] = cnr
+	m["oid"] = obj
+
+	return m, nil
+}
+
+func keyParser(s string) (any, error) {
+	if s == "" {
+		return nil, errors.New("empty attribute key")
+	}
+	return s, nil
+}
+
+func valueParser(s string) (any, error) {
+	if s == "" {
+		return nil, errors.New("empty attribute value")
+	}
+	return s, nil
+}
+
+func AttributeParser(s string) (map[string]any, error) {
+	m := make(map[string]any)
+
+	parts := strings.Split(s, "/")
+	if len(parts) != 1 && len(parts) != 2 {
+		return nil, errors.New("expected <key> or <key>/<value>")
+	}
+
+	key, err := keyParser(parts[0])
+	if err != nil {
+		return nil, err
+	}
+	m["key"] = key
+
+	if len(parts) == 1 {
+		return m, nil
+	}
+
+	value, err := valueParser(parts[1])
+	if err != nil {
+		return nil, err
+	}
+	m["value"] = value
+
+	return m, nil
+}

cmd/frostfs-lens/internal/writecache/root.go

@@ -17,5 +17,5 @@ var Root = &cobra.Command{
 }
 
 func init() {
-	Root.AddCommand(listCMD, inspectCMD)
+	Root.AddCommand(listCMD, inspectCMD, tuiCMD)
 }

cmd/frostfs-lens/internal/writecache/tui.go

@@ -0,0 +1,79 @@
+package writecache
+
+import (
+	"context"
+	"fmt"
+
+	common "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal"
+	schema "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/schema/writecache"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-lens/internal/tui"
+	"github.com/rivo/tview"
+	"github.com/spf13/cobra"
+	"go.etcd.io/bbolt"
+)
+
+var tuiCMD = &cobra.Command{
+	Use:   "explore",
+	Short: "Write cache exploration with a terminal UI",
+	Long: `Launch a terminal UI to explore write cache and search for data.
+
+Available search filters:
+- cid  CID
+- oid  OID
+- addr CID/OID
+`,
+	Run: tuiFunc,
+}
+
+var initialPrompt string
+
+func init() {
+	common.AddComponentPathFlag(tuiCMD, &vPath)
+
+	tuiCMD.Flags().StringVar(
+		&initialPrompt,
+		"filter",
+		"",
+		"Filter prompt to start with, format 'tag:value [+ tag:value]...'",
+	)
+}
+
+func tuiFunc(cmd *cobra.Command, _ []string) {
+	common.ExitOnErr(cmd, runTUI(cmd))
+}
+
+func runTUI(cmd *cobra.Command) error {
+	db, err := openDB(false)
+	if err != nil {
+		return fmt.Errorf("couldn't open database: %w", err)
+	}
+	defer db.Close()
+
+	ctx, cancel := context.WithCancel(cmd.Context())
+	defer cancel()
+
+	app := tview.NewApplication()
+	ui := tui.NewUI(ctx, app, db, schema.WritecacheParser, nil)
+
+	_ = ui.AddFilter("cid", tui.CIDParser, "CID")
+	_ = ui.AddFilter("oid", tui.OIDParser, "OID")
+	_ = ui.AddCompositeFilter("addr", tui.AddressParser, "CID/OID")
+
+	err = ui.WithPrompt(initialPrompt)
+	if err != nil {
+		return fmt.Errorf("invalid filter prompt: %w", err)
+	}
+
+	app.SetRoot(ui, true).SetFocus(ui)
+	return app.Run()
+}
+
+func openDB(writable bool) (*bbolt.DB, error) {
+	db, err := bbolt.Open(vPath, 0o600, &bbolt.Options{
+		ReadOnly: !writable,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return db, nil
+}

go.mod

@@ -17,7 +17,9 @@ require (
 	github.com/VictoriaMetrics/easyproto v0.1.4
 	github.com/cheggaaa/pb v1.0.29
 	github.com/chzyer/readline v1.5.1
+	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc
 	github.com/flynn-archive/go-shlex v0.0.0-20150515145356-3f9db97f8568
+	github.com/gdamore/tcell/v2 v2.7.4
 	github.com/go-pkgz/expirable-cache/v3 v3.0.0
 	github.com/google/uuid v1.6.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
@@ -30,6 +32,7 @@ require (
 	github.com/olekukonko/tablewriter v0.0.5
 	github.com/panjf2000/ants/v2 v2.9.0
 	github.com/prometheus/client_golang v1.19.0
+	github.com/rivo/tview v0.0.0-20240625185742-b0a7293b8130
 	github.com/spf13/cast v1.6.0
 	github.com/spf13/cobra v1.8.1
 	github.com/spf13/pflag v1.0.5
@@ -65,10 +68,10 @@ require (
 	github.com/consensys/bavard v0.1.13 // indirect
 	github.com/consensys/gnark-crypto v0.12.2-0.20231222162921-eb75782795d2 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
-	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/davidmz/go-pageant v1.0.2 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/gdamore/encoding v1.0.0 // indirect
 	github.com/go-fed/httpsig v1.1.0 // indirect
 	github.com/go-logr/logr v1.4.1 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
@@ -85,6 +88,7 @@ require (
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.6 // indirect
 	github.com/klauspost/reedsolomon v1.12.1 // indirect
+	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mattn/go-runewidth v0.0.15 // indirect
 	github.com/minio/sha256-simd v1.0.1 // indirect
@@ -103,7 +107,7 @@ require (
 	github.com/prometheus/client_model v0.5.0 // indirect
 	github.com/prometheus/common v0.48.0 // indirect
 	github.com/prometheus/procfs v0.12.0 // indirect
-	github.com/rivo/uniseg v0.4.4 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
 	github.com/spf13/afero v1.11.0 // indirect

go.sum

@@ -75,6 +75,10 @@ github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4
 github.com/fsnotify/fsnotify v1.5.4/go.mod h1:OVB6XrOHzAwXMpEM7uPOzcehqUV2UqJxmVXmkdnm1bU=
 github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
+github.com/gdamore/encoding v1.0.0 h1:+7OoQ1Bc6eTm5niUzBa0Ctsh6JbMW6Ra+YNuAtDBdko=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/gdamore/tcell/v2 v2.7.4 h1:sg6/UnTM9jGpZU+oFYAsDahfchWAFW8Xx2yFinNSAYU=
+github.com/gdamore/tcell/v2 v2.7.4/go.mod h1:dSXtXTSK0VsW1biw65DZLZ2NKr7j0qP/0J7ONmsraWg=
 github.com/go-fed/httpsig v1.1.0 h1:9M+hb0jkEICD8/cAiNqEB66R87tTINszBRTjwjQzWcI=
 github.com/go-fed/httpsig v1.1.0/go.mod h1:RCMrTZvN1bJYtofsG4rd5NaO5obxQ5xBkdiS7xsT7bM=
 github.com/go-logr/logr v1.2.2/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
@@ -142,6 +146,8 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/leanovate/gopter v0.2.9 h1:fQjYxZaynp97ozCzfOyOuAGOU4aU/z37zf/tOujFk7c=
 github.com/leanovate/gopter v0.2.9/go.mod h1:U2L/78B+KVFIx2VmW6onHJQzXtFb+p5y3y2Sh+Jxxv8=
+github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
+github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
 github.com/magiconair/properties v1.8.7/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
@@ -217,9 +223,12 @@ github.com/prometheus/common v0.48.0 h1:QO8U2CdOzSn1BBsmXJXduaaW+dY/5QLjfB8svtSz
 github.com/prometheus/common v0.48.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5EC6ILDTlAPc=
 github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
 github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
+github.com/rivo/tview v0.0.0-20240625185742-b0a7293b8130 h1:o1CYtoFOm6xJK3DvDAEG5wDJPLj+SoxUtUDFaQgt1iY=
+github.com/rivo/tview v0.0.0-20240625185742-b0a7293b8130/go.mod h1:02iFIz7K/A9jGCvrizLPvoqr4cEIx7q54RH5Qudkrss=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
-github.com/rivo/uniseg v0.4.4 h1:8TfxU8dW6PdqD27gjM8MVNuicgxIjxpm4K7x4jp8sis=
+github.com/rivo/uniseg v0.4.3/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
-github.com/rivo/uniseg v0.4.4/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
+github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
+github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/rogpeppe/go-internal v1.11.0 h1:cWPaGQEPrBb5/AsnsZesgZZ9yb1OQ+GOISoDNXVBh4M=
 github.com/rogpeppe/go-internal v1.11.0/go.mod h1:ddIwULY96R17DhadqLgMfk9H9tvdUzkipdSkR5nkCZA=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
@@ -352,6 +361,7 @@ golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
 golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
@@ -359,6 +369,7 @@ golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuX
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
 golang.org/x/term v0.8.0/go.mod h1:xPskH00ivmX89bAKVGSKKtLOWNx2+17Eiy94tnKShWo=
 golang.org/x/term v0.15.0/go.mod h1:BDl952bC7+uMoWR75FIrCDx79TPU9oHkTZ9yRbYOrX0=
+golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk=
 golang.org/x/term v0.18.0 h1:FcHjZXDMxI8mM3nwhX9HlKop4C0YQvCVCdwYl2wOtE8=
 golang.org/x/term v0.18.0/go.mod h1:ILwASektA3OnRv7amZ1xhE/KTR+u50pbXfZ03+6Nx58=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

scripts/populate-metabase/internal/generate.go

@@ -0,0 +1,132 @@
+package internal
+
+import (
+	"crypto/sha256"
+	"fmt"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/checksum"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id/test"
+	objecttest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/test"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+	usertest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user/test"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/version"
+	"git.frostfs.info/TrueCloudLab/tzhash/tz"
+	"golang.org/x/exp/rand"
+)
+
+func GeneratePayloadPool(count uint, size uint) [][]byte {
+	pool := [][]byte{}
+	for i := uint(0); i < count; i++ {
+		payload := make([]byte, size)
+		_, _ = rand.Read(payload)
+
+		pool = append(pool, payload)
+	}
+	return pool
+}
+
+func GenerateAttributePool(count uint) []objectSDK.Attribute {
+	pool := []objectSDK.Attribute{}
+	for i := uint(0); i < count; i++ {
+		for j := uint(0); j < count; j++ {
+			attr := *objectSDK.NewAttribute()
+			attr.SetKey(fmt.Sprintf("key%d", i))
+			attr.SetValue(fmt.Sprintf("value%d", j))
+			pool = append(pool, attr)
+		}
+	}
+	return pool
+}
+
+func GenerateOwnerPool(count uint) []user.ID {
+	pool := []user.ID{}
+	for i := uint(0); i < count; i++ {
+		pool = append(pool, usertest.ID())
+	}
+	return pool
+}
+
+type ObjectOption func(obj *objectSDK.Object)
+
+func GenerateObject(options ...ObjectOption) *objectSDK.Object {
+	var ver version.Version
+	ver.SetMajor(2)
+	ver.SetMinor(1)
+
+	payload := make([]byte, 0)
+
+	var csum checksum.Checksum
+	csum.SetSHA256(sha256.Sum256(payload))
+
+	var csumTZ checksum.Checksum
+	csumTZ.SetTillichZemor(tz.Sum(csum.Value()))
+
+	obj := objectSDK.New()
+	obj.SetID(oidtest.ID())
+	obj.SetOwnerID(usertest.ID())
+	obj.SetContainerID(cidtest.ID())
+
+	header := objecttest.Object().GetECHeader()
+	header.SetParent(oidtest.ID())
+	obj.SetECHeader(header)
+
+	obj.SetVersion(&ver)
+	obj.SetPayload(payload)
+	obj.SetPayloadSize(uint64(len(payload)))
+	obj.SetPayloadChecksum(csum)
+	obj.SetPayloadHomomorphicHash(csumTZ)
+
+	for _, option := range options {
+		option(obj)
+	}
+
+	return obj
+}
+
+func WithContainerID(cid cid.ID) ObjectOption {
+	return func(obj *objectSDK.Object) {
+		obj.SetContainerID(cid)
+	}
+}
+
+func WithType(typ objectSDK.Type) ObjectOption {
+	return func(obj *objectSDK.Object) {
+		obj.SetType(typ)
+	}
+}
+
+func WithPayloadFromPool(pool [][]byte) ObjectOption {
+	payload := pool[rand.Intn(len(pool))]
+
+	var csum checksum.Checksum
+	csum.SetSHA256(sha256.Sum256(payload))
+
+	var csumTZ checksum.Checksum
+	csumTZ.SetTillichZemor(tz.Sum(csum.Value()))
+
+	return func(obj *objectSDK.Object) {
+		obj.SetPayload(payload)
+		obj.SetPayloadSize(uint64(len(payload)))
+		obj.SetPayloadChecksum(csum)
+		obj.SetPayloadHomomorphicHash(csumTZ)
+	}
+}
+
+func WithAttributesFromPool(pool []objectSDK.Attribute, count uint) ObjectOption {
+	return func(obj *objectSDK.Object) {
+		attrs := []objectSDK.Attribute{}
+		for i := uint(0); i < count; i++ {
+			attrs = append(attrs, pool[rand.Intn(len(pool))])
+		}
+		obj.SetAttributes(attrs...)
+	}
+}
+
+func WithOwnerIDFromPool(pool []user.ID) ObjectOption {
+	return func(obj *objectSDK.Object) {
+		obj.SetOwnerID(pool[rand.Intn(len(pool))])
+	}
+}

scripts/populate-metabase/internal/populate.go

@@ -0,0 +1,263 @@
+package internal
+
+import (
+	"context"
+	"fmt"
+	"math/rand"
+	"sync"
+
+	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/transformer"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"golang.org/x/sync/errgroup"
+)
+
+type EpochState struct{}
+
+func (s EpochState) CurrentEpoch() uint64 {
+	return 0
+}
+
+func PopulateWithObjects(
+	ctx context.Context,
+	db *meta.DB,
+	group *errgroup.Group,
+	count uint,
+	factory func() *objectSDK.Object,
+) {
+	digits := "0123456789"
+
+	for i := uint(0); i < count; i++ {
+		obj := factory()
+
+		id := []byte(fmt.Sprintf(
+			"%c/%c/%c",
+			digits[rand.Int()%len(digits)],
+			digits[rand.Int()%len(digits)],
+			digits[rand.Int()%len(digits)],
+		))
+
+		prm := meta.PutPrm{}
+		prm.SetObject(obj)
+		prm.SetStorageID(id)
+
+		group.Go(func() error {
+			if _, err := db.Put(ctx, prm); err != nil {
+				return fmt.Errorf("couldn't put an object: %w", err)
+			}
+			return nil
+		})
+	}
+}
+
+func PopulateWithBigObjects(
+	ctx context.Context,
+	db *meta.DB,
+	group *errgroup.Group,
+	count uint,
+	factory func() *objectSDK.Object,
+) {
+	for i := uint(0); i < count; i++ {
+		group.Go(func() error {
+			if err := populateWithBigObject(ctx, db, factory); err != nil {
+				return fmt.Errorf("couldn't put a big object: %w", err)
+			}
+			return nil
+		})
+	}
+}
+
+func populateWithBigObject(
+	ctx context.Context,
+	db *meta.DB,
+	factory func() *objectSDK.Object,
+) error {
+	t := &target{db: db}
+
+	pk, _ := keys.NewPrivateKey()
+	p := transformer.NewPayloadSizeLimiter(transformer.Params{
+		Key:            &pk.PrivateKey,
+		NextTargetInit: func() transformer.ObjectWriter { return t },
+		NetworkState:   EpochState{},
+		MaxSize:        10,
+	})
+
+	obj := factory()
+	payload := make([]byte, 30)
+
+	err := p.WriteHeader(ctx, obj)
+	if err != nil {
+		return err
+	}
+
+	_, err = p.Write(ctx, payload)
+	if err != nil {
+		return err
+	}
+
+	_, err = p.Close(ctx)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+type target struct {
+	db *meta.DB
+}
+
+func (t *target) WriteObject(ctx context.Context, obj *objectSDK.Object) error {
+	prm := meta.PutPrm{}
+	prm.SetObject(obj)
+
+	_, err := t.db.Put(ctx, prm)
+	return err
+}
+
+func PopulateGraveyard(
+	ctx context.Context,
+	db *meta.DB,
+	group *errgroup.Group,
+	workBufferSize int,
+	count uint,
+	factory func() *objectSDK.Object,
+) {
+	ts := factory()
+	ts.SetType(objectSDK.TypeTombstone)
+
+	prm := meta.PutPrm{}
+	prm.SetObject(ts)
+
+	group.Go(func() error {
+		if _, err := db.Put(ctx, prm); err != nil {
+			return fmt.Errorf("couldn't put a tombstone object: %w", err)
+		}
+		return nil
+	})
+
+	cID, _ := ts.ContainerID()
+	oID, _ := ts.ID()
+
+	var tsAddr oid.Address
+
+	tsAddr.SetContainer(cID)
+	tsAddr.SetObject(oID)
+
+	addrs := make(chan oid.Address, workBufferSize)
+
+	go func() {
+		defer close(addrs)
+
+		wg := &sync.WaitGroup{}
+		wg.Add(int(count))
+
+		for i := uint(0); i < count; i++ {
+			obj := factory()
+
+			prm := meta.PutPrm{}
+			prm.SetObject(obj)
+
+			group.Go(func() error {
+				defer wg.Done()
+
+				if _, err := db.Put(ctx, prm); err != nil {
+					return fmt.Errorf("couldn't put an object: %w", err)
+				}
+
+				cID, _ := obj.ContainerID()
+				oID, _ := obj.ID()
+
+				var addr oid.Address
+				addr.SetContainer(cID)
+				addr.SetObject(oID)
+
+				addrs <- addr
+				return nil
+			})
+		}
+		wg.Wait()
+	}()
+
+	go func() {
+		for addr := range addrs {
+			prm := meta.InhumePrm{}
+			prm.SetAddresses(addr)
+			prm.SetTombstoneAddress(tsAddr)
+
+			group.Go(func() error {
+				if _, err := db.Inhume(ctx, prm); err != nil {
+					return fmt.Errorf("couldn't inhume an object: %w", err)
+				}
+				return nil
+			})
+		}
+	}()
+}
+
+func PopulateLocked(
+	ctx context.Context,
+	db *meta.DB,
+	group *errgroup.Group,
+	workBufferSize int,
+	count uint,
+	factory func() *objectSDK.Object,
+) {
+	locker := factory()
+	locker.SetType(objectSDK.TypeLock)
+
+	prm := meta.PutPrm{}
+	prm.SetObject(locker)
+
+	group.Go(func() error {
+		if _, err := db.Put(ctx, prm); err != nil {
+			return fmt.Errorf("couldn't put a locker object: %w", err)
+		}
+		return nil
+	})
+
+	ids := make(chan oid.ID, workBufferSize)
+
+	go func() {
+		defer close(ids)
+
+		wg := &sync.WaitGroup{}
+		wg.Add(int(count))
+
+		for i := uint(0); i < count; i++ {
+			defer wg.Done()
+
+			obj := factory()
+
+			prm := meta.PutPrm{}
+			prm.SetObject(obj)
+
+			group.Go(func() error {
+				if _, err := db.Put(ctx, prm); err != nil {
+					return fmt.Errorf("couldn't put an object: %w", err)
+				}
+
+				id, _ := obj.ID()
+				ids <- id
+				return nil
+			})
+		}
+		wg.Wait()
+	}()
+
+	go func() {
+		for id := range ids {
+			lockerCID, _ := locker.ContainerID()
+			lockerOID, _ := locker.ID()
+
+			group.Go(func() error {
+				if err := db.Lock(ctx, lockerCID, lockerOID, []oid.ID{id}); err != nil {
+					return fmt.Errorf("couldn't lock an object: %w", err)
+				}
+				return nil
+			})
+		}
+	}()
+}

scripts/populate-metabase/main.go

@@ -0,0 +1,159 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"flag"
+	"fmt"
+	"os"
+
+	meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/scripts/populate-metabase/internal"
+	cidtest "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id/test"
+	objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	"golang.org/x/sync/errgroup"
+)
+
+var (
+	path  string
+	force bool
+	jobs  uint
+
+	numContainers,
+	numObjects,
+	numAttributesPerObj,
+	numOwners,
+	numPayloads,
+	numAttributes uint
+)
+
+func main() {
+	flag.StringVar(&path, "path", "", "Path to metabase")
+	flag.BoolVar(&force, "force", false, "Rewrite existing database")
+	flag.UintVar(&jobs, "j", 10000, "Number of jobs to run")
+
+	flag.UintVar(&numContainers, "containers", 0, "Number of containers to be created")
+	flag.UintVar(&numObjects, "objects", 0, "Number of objects per container")
+	flag.UintVar(&numAttributesPerObj, "attributes", 0, "Number of attributes per object")
+
+	flag.UintVar(&numOwners, "distinct-owners", 10, "Number of distinct owners to be used")
+	flag.UintVar(&numPayloads, "distinct-payloads", 10, "Number of distinct payloads to be used")
+	flag.UintVar(&numAttributes, "distinct-attributes", 10, "Number of distinct attributes to be used")
+
+	flag.Parse()
+
+	exitIf(numPayloads == 0, "must have payloads\n")
+	exitIf(numAttributes == 0, "must have attributes\n")
+	exitIf(numOwners == 0, "must have owners\n")
+	exitIf(len(path) == 0, "path to metabase not specified\n")
+	exitIf(
+		numAttributesPerObj > numAttributes,
+		"object can't have more attributes than available\n",
+	)
+
+	info, err := os.Stat(path)
+	exitIf(
+		err != nil && !errors.Is(err, os.ErrNotExist),
+		"couldn't get path info: %s\n", err,
+	)
+
+	// Path exits.
+	if err == nil {
+		exitIf(info.IsDir(), "path is a directory\n")
+		exitIf(!force, "couldn't rewrite existing file, use '-force' flag\n")
+
+		err = os.Remove(path)
+		exitIf(err != nil, "couldn't remove existing file: %s\n", err)
+	}
+
+	err = populate()
+	exitIf(err != nil, "couldn't populate the metabase: %s\n", err)
+}
+
+func getObjectFactory(opts ...internal.ObjectOption) func() *objectSDK.Object {
+	return func() *objectSDK.Object {
+		return internal.GenerateObject(opts...)
+	}
+}
+
+func populate() (err error) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	db := meta.New([]meta.Option{
+		meta.WithPath(path),
+		meta.WithPermissions(0o600),
+		meta.WithEpochState(internal.EpochState{}),
+	}...)
+
+	if err = db.Open(ctx, mode.ReadWrite); err != nil {
+		return fmt.Errorf("couldn't open the metabase: %w", err)
+	}
+	defer func() {
+		if errOnClose := db.Close(); errOnClose != nil {
+			err = errors.Join(
+				err,
+				fmt.Errorf("couldn't close the metabase: %w", db.Close()),
+			)
+		}
+	}()
+
+	if err = db.Init(); err != nil {
+		return fmt.Errorf("couldn't init the metabase: %w", err)
+	}
+
+	payloads := internal.GeneratePayloadPool(numPayloads, 32)
+	attributes := internal.GenerateAttributePool(numAttributes)
+	owners := internal.GenerateOwnerPool(numOwners)
+
+	types := []objectSDK.Type{
+		objectSDK.TypeRegular,
+		objectSDK.TypeLock,
+		objectSDK.TypeTombstone,
+	}
+
+	eg, ctx := errgroup.WithContext(ctx)
+	eg.SetLimit(int(jobs))
+
+	for i := uint(0); i < numContainers; i++ {
+		cid := cidtest.ID()
+
+		for _, typ := range types {
+			internal.PopulateWithObjects(ctx, db, eg, numObjects, getObjectFactory(
+				internal.WithContainerID(cid),
+				internal.WithType(typ),
+				internal.WithPayloadFromPool(payloads),
+				internal.WithOwnerIDFromPool(owners),
+				internal.WithAttributesFromPool(attributes, numAttributesPerObj),
+			))
+		}
+		internal.PopulateWithBigObjects(ctx, db, eg, numObjects, getObjectFactory(
+			internal.WithContainerID(cid),
+			internal.WithType(objectSDK.TypeRegular),
+			internal.WithAttributesFromPool(attributes, numAttributesPerObj),
+			internal.WithOwnerIDFromPool(owners),
+		))
+		internal.PopulateGraveyard(ctx, db, eg, int(jobs), numObjects, getObjectFactory(
+			internal.WithContainerID(cid),
+			internal.WithType(objectSDK.TypeRegular),
+			internal.WithAttributesFromPool(attributes, numAttributesPerObj),
+			internal.WithOwnerIDFromPool(owners),
+		))
+		internal.PopulateLocked(ctx, db, eg, int(jobs), numObjects, getObjectFactory(
+			internal.WithContainerID(cid),
+			internal.WithType(objectSDK.TypeRegular),
+			internal.WithAttributesFromPool(attributes, numAttributesPerObj),
+			internal.WithOwnerIDFromPool(owners),
+		))
+	}
+
+	return eg.Wait()
+}
+
+func exitIf(cond bool, format string, args ...any) {
+	if cond {
+		fmt.Fprintf(os.Stderr, format, args...)
+		os.Exit(1)
+	}
+}