[#1704] Add command container nodes to output list of nodes for container, grouped by replica (#1704)

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

cmd/neofs-cli/modules/container/nodes.go

@@ -0,0 +1,62 @@
+package container
+
+import (
+	"crypto/sha256"
+
+	internalclient "github.com/nspcc-dev/neofs-node/cmd/neofs-cli/internal/client"
+	"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"
+	containerAPI "github.com/nspcc-dev/neofs-sdk-go/container"
+	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
+	"github.com/nspcc-dev/neofs-sdk-go/netmap"
+	"github.com/spf13/cobra"
+)
+
+var short bool
+
+var containerNodesCmd = &cobra.Command{
+	Use:   "nodes",
+	Short: "Show nodes for container",
+	Long:  "Show nodes taking part in a container at the current epoch.",
+	Run: func(cmd *cobra.Command, args []string) {
+		var cnr, pkey = getContainer(cmd)
+
+		if pkey == nil {
+			pkey = key.GetOrGenerate(cmd)
+		}
+
+		cli := internalclient.GetSDKClientByFlag(cmd, pkey, commonflags.RPC)
+
+		var prm internalclient.NetMapSnapshotPrm
+		prm.SetClient(cli)
+
+		resmap, err := internalclient.NetMapSnapshot(prm)
+		common.ExitOnErr(cmd, "unable to get netmap snapshot", err)
+
+		var id cid.ID
+		containerAPI.CalculateID(&id, cnr)
+		binCnr := make([]byte, sha256.Size)
+		id.Encode(binCnr)
+
+		var cnrNodes [][]netmap.NodeInfo
+		cnrNodes, err = resmap.NetMap().ContainerNodes(cnr.PlacementPolicy(), binCnr)
+		common.ExitOnErr(cmd, "could not build container nodes for given container: %w", err)
+
+		for i := range cnrNodes {
+			cmd.Printf("Rep %d\n", i+1)
+			for j := range cnrNodes[i] {
+				common.PrettyPrintNodeInfo(cmd, cnrNodes[i][j], j, "\t", short)
+			}
+		}
+	},
+}
+
+func initContainerNodesCmd() {
+	commonflags.Init(containerNodesCmd)
+
+	flags := containerNodesCmd.Flags()
+	flags.StringVar(&containerID, cidFlag, "", cidFlagUsage)
+	flags.StringVar(&containerPathFrom, fromFlag, "", fromFlagUsage)
+	flags.BoolVar(&short, "short", false, "Shortens output of node info")
+}