[#1223] lens/tui: Add TUI app for write cache

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

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 +1,78 @@
+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:   "tui",
+	Short: "Write cache TUI",
+	Long: `Launch a TUI to browse 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)
+	common.ExitOnErr(cmd, 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, fmt.Errorf("couldn't open database: %w", err)
+	}
+	return db, nil
+}