[#521] cli: Add netmap load command to policy playground

Signed-off-by: Alejandro Lopez <a.lopez@yadro.com>

cmd/frostfs-cli/modules/container/policy_playground.go

@@ -3,6 +3,7 @@ package container
 import (
 	"bufio"
 	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"io"
 	"os"
@@ -39,7 +40,7 @@ func (repl *policyPlaygroundREPL) handleLs(args []string) error {
 	for id, node := range repl.nodes {
 		var attrs []string
 		node.IterateAttributes(func(k, v string) {
-			attrs = append(attrs, fmt.Sprintf("%s:%s", k, v))
+			attrs = append(attrs, fmt.Sprintf("%s:%q", k, v))
 		})
 		fmt.Printf("\t%2d: id=%s attrs={%v}\n", i, id, strings.Join(attrs, " "))
 		i++
@@ -69,6 +70,40 @@ func (repl *policyPlaygroundREPL) handleAdd(args []string) error {
 	return nil
 }
 
+func (repl *policyPlaygroundREPL) handleLoad(args []string) error {
+	if len(args) != 1 {
+		return fmt.Errorf("too few arguments for command 'add': got %d, want 1", len(args))
+	}
+
+	jsonNetmap := map[string]map[string]string{}
+
+	b, err := os.ReadFile(args[0])
+	if err != nil {
+		return fmt.Errorf("reading netmap file %q: %v", args[0], err)
+	}
+
+	if err := json.Unmarshal(b, &jsonNetmap); err != nil {
+		return fmt.Errorf("decoding json netmap: %v", err)
+	}
+
+	repl.nodes = make(map[string]netmap.NodeInfo)
+	for id, attrs := range jsonNetmap {
+		key, err := hex.DecodeString(id)
+		if err != nil {
+			return fmt.Errorf("node id must be a hex string: got %q: %v", id, err)
+		}
+
+		node := repl.nodes[id]
+		node.SetPublicKey(key)
+		for k, v := range attrs {
+			node.SetAttribute(k, v)
+		}
+		repl.nodes[id] = node
+	}
+
+	return nil
+}
+
 func (repl *policyPlaygroundREPL) handleRemove(args []string) error {
 	if len(args) == 0 {
 		return fmt.Errorf("too few arguments for command 'remove': got %d, want >0", len(args))
@@ -150,6 +185,7 @@ func (repl *policyPlaygroundREPL) run() error {
 	cmdHandlers := map[string]func([]string) error{
 		"ls":     repl.handleLs,
 		"add":    repl.handleAdd,
+		"load":   repl.handleLoad,
 		"remove": repl.handleRemove,
 		"eval":   repl.handleEval,
 	}