[#1332] cli: Implement `tree get-by-path` command

It is `TreeService.GetNodeByPath` method implementation.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

cmd/neofs-cli/modules/tree/get_by_path.go

@@ -0,0 +1,98 @@
+package tree
+
+import (
+	"crypto/sha256"
+	"strings"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/common"
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/commonflags"
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/key"
+	"github.com/nspcc-dev/neofs-node/pkg/services/tree"
+	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
+	"github.com/nspcc-dev/neofs-sdk-go/object"
+	"github.com/spf13/cobra"
+)
+
+var getByPathCmd = &cobra.Command{
+	Use:   "get-by-path",
+	Short: "Get a node by its path",
+	Run:   getByPath,
+	PersistentPreRun: func(cmd *cobra.Command, _ []string) {
+		commonflags.Bind(cmd)
+	},
+}
+
+func initGetByPathCmd() {
+	commonflags.Init(getByPathCmd)
+	initCTID(getByPathCmd)
+
+	ff := getByPathCmd.Flags()
+
+	// tree service does not allow any attribute except
+	// the 'FileName' but that's a limitation of the
+	// current implementation, not the rule
+	//ff.String(pathAttributeFlagKey, "", "Path attribute")
+	ff.String(pathFlagKey, "", "Path to a node")
+
+	ff.Bool(latestOnlyFlagKey, false, "Look only for the latest version of a node")
+
+	_ = cobra.MarkFlagRequired(ff, commonflags.RPC)
+}
+
+func getByPath(cmd *cobra.Command, _ []string) {
+	pk := key.GetOrGenerate(cmd)
+
+	cidRaw, _ := cmd.Flags().GetString(containerIDFlagKey)
+
+	var cnr cid.ID
+	err := cnr.DecodeString(cidRaw)
+	common.ExitOnErr(cmd, "decode container ID string: %w", err)
+
+	tid, _ := cmd.Flags().GetString(treeIDFlagKey)
+	ctx := cmd.Context()
+
+	cli, err := _client(ctx)
+	common.ExitOnErr(cmd, "client: %w", err)
+
+	rawCID := make([]byte, sha256.Size)
+	cnr.Encode(rawCID)
+
+	latestOnly, _ := cmd.Flags().GetBool(latestOnlyFlagKey)
+	path, _ := cmd.Flags().GetString(pathFlagKey)
+	//pAttr, _ := cmd.Flags().GetString(pathAttributeFlagKey)
+
+	req := new(tree.GetNodeByPathRequest)
+	req.Body = &tree.GetNodeByPathRequest_Body{
+		ContainerId:   rawCID,
+		TreeId:        tid,
+		PathAttribute: object.AttributeFileName,
+		//PathAttribute: pAttr,
+		Path:          strings.Split(path, "/"),
+		LatestOnly:    latestOnly,
+		AllAttributes: true,
+		BearerToken:   nil, // TODO: #1891 add token handling
+	}
+
+	common.ExitOnErr(cmd, "message signing: %w", tree.SignMessage(req, pk))
+
+	resp, err := cli.GetNodeByPath(ctx, req)
+	common.ExitOnErr(cmd, "rpc call: %w", err)
+
+	nn := resp.GetBody().GetNodes()
+	if len(nn) == 0 {
+		cmd.Println("The node is not found")
+		return
+	}
+
+	for _, n := range nn {
+		cmd.Printf("%d:\n", n.GetNodeId())
+
+		cmd.Println("\tParent ID: ", n.GetParentId())
+		cmd.Println("\tTimestamp: ", n.GetTimestamp())
+
+		cmd.Println("\tMeta pairs: ")
+		for _, kv := range n.GetMeta() {
+			cmd.Printf("\t\t%s: %s\n", kv.GetKey(), string(kv.GetValue()))
+		}
+	}
+}

cmd/neofs-cli/modules/tree/root.go

@@ -11,8 +11,10 @@ var Cmd = &cobra.Command{
 
 func init() {
 	Cmd.AddCommand(addCmd)
+	Cmd.AddCommand(getByPathCmd)
 
 	initAddCmd()
+	initGetByPathCmd()
 }
 
 const (
@@ -21,6 +23,11 @@ const (
 	parentIDFlagKey    = "pid"
 
 	metaFlagKey = "meta"
+
+	pathFlagKey          = "path"
+	pathAttributeFlagKey = "pattr"
+
+	latestOnlyFlagKey = "latest"
 )
 
 func initCTID(cmd *cobra.Command) {