[#1] Add frostfs backend

Signed-off-by: Aleksey Kravchenko <al.kravchenko@yadro.com>

internal/backend/frostfs/utils.go

@@ -0,0 +1,146 @@
+package frostfs
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strconv"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
+	"github.com/nspcc-dev/neo-go/cli/flags"
+	"github.com/nspcc-dev/neo-go/pkg/wallet"
+)
+
+// BuffCloser is wrapper to load files from neofs.
+type BuffCloser struct {
+	io.Reader
+}
+
+func (bc *BuffCloser) Close() error {
+	return nil
+}
+
+func createPool(ctx context.Context, acc *wallet.Account, cfg Config) (*pool.Pool, error) {
+	var prm pool.InitParameters
+	prm.SetKey(&acc.PrivateKey().PrivateKey)
+	prm.SetNodeDialTimeout(cfg.Timeout)
+	prm.SetHealthcheckTimeout(cfg.Timeout)
+	prm.SetClientRebalanceInterval(cfg.RebalanceInterval)
+	prm.AddNode(pool.NewNodeParam(1, cfg.Endpoint, 1))
+
+	p, err := pool.NewPool(prm)
+	if err != nil {
+		return nil, fmt.Errorf("create pool: %w", err)
+	}
+
+	if err = p.Dial(ctx); err != nil {
+		return nil, fmt.Errorf("dial pool: %w", err)
+	}
+
+	return p, nil
+}
+
+func getAccount(cfg Config) (*wallet.Account, error) {
+	w, err := wallet.NewWalletFromFile(cfg.Wallet)
+	if err != nil {
+		return nil, err
+	}
+
+	addr := w.GetChangeAddress()
+	if cfg.Address != "" {
+		addr, err = flags.ParseAddress(cfg.Address)
+		if err != nil {
+			return nil, fmt.Errorf("invalid address")
+		}
+	}
+	acc := w.GetAccount(addr)
+	err = acc.Decrypt(cfg.Password, w.Scrypt)
+	if err != nil {
+		return nil, err
+	}
+
+	return acc, nil
+}
+
+func getContainerID(ctx context.Context, client *pool.Pool, owner user.ID, container string) (cid.ID, error) {
+	var cnrID cid.ID
+	if err := cnrID.DecodeString(container); err != nil {
+		return findContainerID(ctx, client, owner, container)
+	}
+	return cnrID, nil
+}
+
+func findContainerID(ctx context.Context, client *pool.Pool, owner user.ID, containerName string) (cid.ID, error) {
+	prm := pool.PrmContainerList{OwnerID: owner}
+
+	containerIDs, err := client.ListContainers(ctx, prm)
+	if err != nil {
+		return cid.ID{}, fmt.Errorf("list containers: %w", err)
+	}
+
+	for _, cnrID := range containerIDs {
+		prmGet := pool.PrmContainerGet{ContainerID: cnrID}
+
+		cnr, err := client.GetContainer(ctx, prmGet)
+		if err != nil {
+			return cid.ID{}, fmt.Errorf("get container: %w", err)
+		}
+
+		if containerName == container.Name(cnr) {
+			return cnrID, nil
+		}
+	}
+
+	return cid.ID{}, fmt.Errorf("container '%s' not found", containerName)
+}
+
+func formRawObject(own *user.ID, cnrID cid.ID, name string, header map[string]string) *object.Object {
+	attributes := make([]object.Attribute, 0, 2+len(header))
+	filename := object.NewAttribute()
+	filename.SetKey(object.AttributeFileName)
+	filename.SetValue(name)
+
+	createdAt := object.NewAttribute()
+	createdAt.SetKey(object.AttributeTimestamp)
+	createdAt.SetValue(strconv.FormatInt(time.Now().UTC().Unix(), 10))
+
+	attributes = append(attributes, *filename, *createdAt)
+
+	for key, val := range header {
+		attr := object.NewAttribute()
+		attr.SetKey(key)
+		attr.SetValue(val)
+		attributes = append(attributes, *attr)
+	}
+
+	obj := object.New()
+	obj.SetOwnerID(*own)
+	obj.SetContainerID(cnrID)
+	obj.SetAttributes(attributes...)
+
+	return obj
+}
+
+func newAddress(cnrID cid.ID, objID oid.ID) oid.Address {
+	var addr oid.Address
+	addr.SetContainer(cnrID)
+	addr.SetObject(objID)
+	return addr
+}
+
+func getNameAttr(obj object.Object) string {
+	for _, attr := range obj.Attributes() {
+		if attr.Key() == object.AttributeFileName {
+			return attr.Value()
+		}
+	}
+
+	objID, _ := obj.ID()
+	return objID.EncodeToString()
+}