[#1223] lens/tui: Add metabase schema

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

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
+	}
+}