[#429] Add tree service for notifications

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>

api/layer/notifications.go

@@ -4,11 +4,11 @@ import (
 	"bytes"
 	"context"
 	"encoding/xml"
+	errorsStd "errors"
 	"fmt"
 
 	"github.com/nspcc-dev/neofs-s3-gw/api"
 	"github.com/nspcc-dev/neofs-s3-gw/api/data"
-	"github.com/nspcc-dev/neofs-s3-gw/api/errors"
 	"go.uber.org/zap"
 )
 
@@ -24,20 +24,43 @@ func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBu
 		return fmt.Errorf("marshal notify configuration: %w", err)
 	}
 
+	ids, nodeIds, err := n.treeService.GetNotificationConfigurationNodes(ctx, &p.BktInfo.CID, false)
+	if err != nil && !errorsStd.Is(err, ErrNodeNotFound) {
+		return err
+	}
+
+	sysName := p.BktInfo.NotificationConfigurationObjectName()
+
 	s := &PutSystemObjectParams{
 		BktInfo:  p.BktInfo,
-		ObjName:  p.BktInfo.NotificationConfigurationObjectName(),
+		ObjName:  sysName,
 		Metadata: map[string]string{},
 		Reader:   bytes.NewReader(confXML),
 		Size:     int64(len(confXML)),
 	}
 
-	_, err = n.putSystemObjectIntoNeoFS(ctx, s)
+	obj, err := n.putSystemObjectIntoNeoFS(ctx, s)
 	if err != nil {
 		return err
 	}
 
-	if err = n.systemCache.PutNotificationConfiguration(systemObjectKey(p.BktInfo, s.ObjName), p.Configuration); err != nil {
+	if err = n.treeService.PutNotificationConfigurationNode(ctx, &p.BktInfo.CID, &obj.ID); err != nil {
+		return err
+	}
+
+	for i := 0; i < len(ids); i++ {
+		if err = n.objectDelete(ctx, p.BktInfo, *ids[i]); err != nil {
+			n.log.Error("couldn't delete notification configuration object", zap.Error(err),
+				zap.String("cnrID", p.BktInfo.CID.EncodeToString()),
+				zap.String("bucket name", p.BktInfo.Name),
+				zap.String("objID", ids[i].EncodeToString()))
+		}
+		if err = n.treeService.DeleteNotificationConfigurationNode(ctx, &p.BktInfo.CID, nodeIds[i]); err != nil {
+			return err
+		}
+	}
+
+	if err = n.systemCache.PutNotificationConfiguration(systemObjectKey(p.BktInfo, sysName), p.Configuration); err != nil {
 		n.log.Error("couldn't cache system object", zap.Error(err))
 	}
 
@@ -45,38 +68,33 @@ func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBu
 }
 
 func (n *layer) GetBucketNotificationConfiguration(ctx context.Context, bktInfo *data.BucketInfo) (*data.NotificationConfiguration, error) {
-	conf, err := n.getNotificationConf(ctx, bktInfo, bktInfo.NotificationConfigurationObjectName())
+	systemCacheKey := systemObjectKey(bktInfo, bktInfo.NotificationConfigurationObjectName())
-	if err != nil {
-		if errors.IsS3Error(err, errors.ErrNoSuchKey) {
-			return &data.NotificationConfiguration{}, nil
-		}
-		return nil, err
-	}
 
-	return conf, nil
+	if conf := n.systemCache.GetNotificationConfiguration(systemCacheKey); conf != nil {
-}
-
-func (n *layer) getNotificationConf(ctx context.Context, bkt *data.BucketInfo, sysName string) (*data.NotificationConfiguration, error) {
-	if conf := n.systemCache.GetNotificationConfiguration(systemObjectKey(bkt, sysName)); conf != nil {
 		return conf, nil
 	}
 
-	obj, err := n.getSystemObjectFromNeoFS(ctx, bkt, sysName)
+	ids, _, err := n.treeService.GetNotificationConfigurationNodes(ctx, &bktInfo.CID, true)
-	if err != nil {
+	if err != nil && !errorsStd.Is(err, ErrNodeNotFound) {
 		return nil, err
 	}
 
 	conf := &data.NotificationConfiguration{}
 
-	if err = xml.Unmarshal(obj.Payload(), &conf); err != nil {
+	if len(ids) != 0 {
-		return nil, fmt.Errorf("unmarshal notify configuration: %w", err)
+		obj, err := n.objectGet(ctx, bktInfo, *ids[0])
+		if err != nil {
+			return nil, err
+		}
+
+		if err = xml.Unmarshal(obj.Payload(), &conf); err != nil {
+			return nil, fmt.Errorf("unmarshal notify configuration: %w", err)
+		}
 	}
 
-	if err = n.systemCache.PutNotificationConfiguration(systemObjectKey(bkt, sysName), conf); err != nil {
+	if err = n.systemCache.PutNotificationConfiguration(systemCacheKey, conf); err != nil {
-		objID, _ := obj.ID()
 		n.log.Warn("couldn't put system meta to objects cache",
-			zap.Stringer("object id", &objID),
+			zap.Stringer("bucket id", bktInfo.CID),
-			zap.Stringer("bucket id", bkt.CID),
 			zap.Error(err))
 	}
 

api/layer/tree_service.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/nspcc-dev/neofs-s3-gw/api/data"
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
+	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
 )
 
 // TreeService provide interface to interact with tree service using s3 data models.
@@ -17,6 +18,10 @@ type TreeService interface {
 	//
 	// If node is not found returns ErrNodeNotFound error.
 	GetSettingsNode(context.Context, *cid.ID, string) (*data.BucketSettings, error)
+
+	GetNotificationConfigurationNodes(ctx context.Context, cnrID *cid.ID, latestOnly bool) ([]*oid.ID, []uint64, error)
+	PutNotificationConfigurationNode(ctx context.Context, cnrID *cid.ID, objID *oid.ID) error
+	DeleteNotificationConfigurationNode(ctx context.Context, cnrID *cid.ID, nodeID uint64) error
 }
 
 // ErrNodeNotFound is returned from Tree service in case of not found error.

internal/neofs/tree.go

@@ -37,7 +37,10 @@ const (
 	fileNameKV          = "FileName"
 	systemNameKV        = "SystemName"
 
-	settingsFileName = "bucket-settings"
+	settingsFileName  = "bucket-settings"
+	notifConfFileName = "bucket-notifications"
+
+	notifTreeID = "notifications"
 )
 
 // NewTreeClient creates instance of TreeClient using provided address and create grpc connection.
@@ -126,6 +129,36 @@ func (c *TreeClient) PutSettingsNode(ctx context.Context, cnrID *cid.ID, treeID
 	return c.moveNode(ctx, cnrID, treeID, node.ID, 0, meta)
 }
 
+func (c *TreeClient) GetNotificationConfigurationNodes(ctx context.Context, cnrID *cid.ID, latestOnly bool) ([]*oid.ID, []uint64, error) {
+	nodes, err := c.getSystemNodesWithOID(ctx, cnrID, notifTreeID, notifConfFileName, []string{}, latestOnly)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	ids := make([]*oid.ID, 0, len(nodes))
+	nodeIds := make([]uint64, 0, len(nodes))
+
+	for _, n := range nodes {
+		ids = append(ids, n.ObjID)
+		nodeIds = append(nodeIds, n.ID)
+	}
+
+	return ids, nodeIds, nil
+}
+
+func (c *TreeClient) PutNotificationConfigurationNode(ctx context.Context, cnrID *cid.ID, objID *oid.ID) error {
+	meta := make(map[string]string)
+	meta[systemNameKV] = notifConfFileName
+	meta[oidKv] = objID.EncodeToString()
+
+	_, err := c.addNode(ctx, cnrID, notifTreeID, 0, meta)
+	return err
+}
+
+func (c *TreeClient) DeleteNotificationConfigurationNode(ctx context.Context, cnrID *cid.ID, nodeID uint64) error {
+	return c.removeNode(ctx, cnrID, notifTreeID, nodeID)
+}
+
 func (c *TreeClient) Close() error {
 	if c.conn != nil {
 		return c.conn.Close()
@@ -239,6 +272,18 @@ func (c *TreeClient) moveNode(ctx context.Context, cnrID *cid.ID, treeID string,
 	return err
 }
 
+func (c *TreeClient) removeNode(ctx context.Context, cnrID *cid.ID, treeID string, nodeID uint64) error {
+	r := &tree.RemoveRequest{
+		Body: &tree.RemoveRequest_Body{
+			ContainerId: []byte(cnrID.EncodeToString()),
+			TreeId:      treeID,
+			NodeId:      nodeID,
+		},
+	}
+	_, err := c.service.Remove(ctx, r)
+	return err
+}
+
 func metaToKV(meta map[string]string) []*tree.KeyValue {
 	result := make([]*tree.KeyValue, 0, len(meta))