[#1401] services/tree: Retransmit queries to container nodes

Also fix a bug with replicator using the multiaddress instead of
<host>:<port> format expected by gRPC library.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/services/tree/redirect.go

@@ -0,0 +1,69 @@
+package tree
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neofs-node/pkg/network"
+	cidSDK "github.com/nspcc-dev/neofs-sdk-go/container/id"
+	"go.uber.org/zap"
+	"google.golang.org/grpc"
+)
+
+var errNoSuitableNode = errors.New("no node was found to execute the request")
+
+// forEachNode executes callback for each node in the container.
+// If the node belongs to a container, nil error is returned.
+// Otherwise, f is executed for each node, stopping if true is returned.
+func (s *Service) forEachNode(ctx context.Context, cid cidSDK.ID, f func(c TreeServiceClient) bool) error {
+	cntNodes, err := s.getContainerNodes(cid)
+	if err != nil {
+		return fmt.Errorf("can't get container nodes for %s: %w", cid, err)
+	}
+
+	rawPub := (*keys.PublicKey)(&s.key.PublicKey).Bytes()
+	for _, n := range cntNodes {
+		if bytes.Equal(n.PublicKey(), rawPub) {
+			return nil
+		}
+	}
+
+	var called bool
+	for _, n := range cntNodes {
+		var stop bool
+		n.IterateNetworkEndpoints(func(endpoint string) bool {
+			c, err := dialTreeService(ctx, endpoint)
+			if err != nil {
+				return false
+			}
+
+			s.log.Debug("redirecting tree service query", zap.String("endpoint", endpoint))
+			called = true
+			stop = f(c)
+			return true
+		})
+		if stop {
+			return nil
+		}
+	}
+	if !called {
+		return errNoSuitableNode
+	}
+	return nil
+}
+
+func dialTreeService(ctx context.Context, netmapAddr string) (TreeServiceClient, error) {
+	var netAddr network.Address
+	if err := netAddr.FromString(netmapAddr); err != nil {
+		return nil, err
+	}
+
+	cc, err := grpc.DialContext(ctx, netAddr.URIAddr(), grpc.WithInsecure())
+	if err != nil {
+		return nil, err
+	}
+	return NewTreeServiceClient(cc), nil
+}