[#1681] node: Block only Object service ops under maintenance

In previous implementation node blocked any operation of local object
storage in maintenance mode. There is a need to perform some storage
operations like data evacuation or restoration.

Do not call block storage engine in maintenance mode. Make all Object
service operations to return `apistatus.NodeUnderMaintenance` error from
each local op.

Signed-off-by: Leonard Lyubich <ctulhurider@gmail.com>

pkg/services/object/get/service.go

@@ -130,3 +130,10 @@ func WithKeyStorage(store *util.KeyStorage) Option {
 		c.keyStore = store
 	}
 }
+
+// WithNodeState provides util.NodeState to Service.
+func WithNodeState(v util.NodeState) Option {
+	return func(c *cfg) {
+		c.localStorage.(*storageEngineWrapper).state = v
+	}
+}

pkg/services/object/get/util.go

@@ -8,6 +8,8 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/engine"
 	internal "github.com/nspcc-dev/neofs-node/pkg/services/object/internal/client"
 	internalclient "github.com/nspcc-dev/neofs-node/pkg/services/object/internal/client"
+	"github.com/nspcc-dev/neofs-node/pkg/services/object/util"
+	apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
 	"github.com/nspcc-dev/neofs-sdk-go/object"
 )
 
@@ -26,6 +28,8 @@ type clientWrapper struct {
 }
 
 type storageEngineWrapper struct {
+	state util.NodeState
+
 	engine *engine.StorageEngine
 }
 
@@ -170,6 +174,11 @@ func (c *clientWrapper) getObject(exec *execCtx, info coreclient.NodeInfo) (*obj
 }
 
 func (e *storageEngineWrapper) get(exec *execCtx) (*object.Object, error) {
+	if e.state != nil && e.state.IsMaintenance() {
+		var st apistatus.NodeUnderMaintenance
+		return nil, st
+	}
+
 	if exec.headOnly() {
 		var headPrm engine.HeadPrm
 		headPrm.WithAddress(exec.address())

pkg/services/object/search/service.go

@@ -81,9 +81,12 @@ func WithLogger(l *logger.Logger) Option {
 
 // WithLocalStorageEngine returns option to set local storage
 // instance.
-func WithLocalStorageEngine(e *engine.StorageEngine) Option {
+func WithLocalStorageEngine(e *engine.StorageEngine, state util.NodeState) Option {
 	return func(c *cfg) {
-		c.localStorage = (*storageEngineWrapper)(e)
+		c.localStorage = &storageEngineWrapper{
+			state:   state,
+			storage: e,
+		}
 	}
 }
 

pkg/services/object/search/util.go

@@ -9,6 +9,7 @@ import (
 	internalclient "github.com/nspcc-dev/neofs-node/pkg/services/object/internal/client"
 	"github.com/nspcc-dev/neofs-node/pkg/services/object/util"
 	"github.com/nspcc-dev/neofs-node/pkg/services/object_manager/placement"
+	apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
 	cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
 	oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
 )
@@ -29,7 +30,11 @@ type clientWrapper struct {
 	client client.MultiAddressClient
 }
 
-type storageEngineWrapper engine.StorageEngine
+type storageEngineWrapper struct {
+	state util.NodeState
+
+	storage *engine.StorageEngine
+}
 
 type traverseGeneratorWrapper util.TraverserGenerator
 
@@ -120,11 +125,16 @@ func (c *clientWrapper) searchObjects(exec *execCtx, info client.NodeInfo) ([]oi
 }
 
 func (e *storageEngineWrapper) search(exec *execCtx) ([]oid.ID, error) {
+	if e.state != nil && e.state.IsMaintenance() {
+		var st apistatus.NodeUnderMaintenance
+		return nil, st
+	}
+
 	var selectPrm engine.SelectPrm
 	selectPrm.WithFilters(exec.searchFilters())
 	selectPrm.WithContainerID(exec.containerID())
 
-	r, err := (*engine.StorageEngine)(e).Select(selectPrm)
+	r, err := e.storage.Select(selectPrm)
 	if err != nil {
 		return nil, err
 	}

pkg/services/object/util/node_state.go

@@ -0,0 +1,9 @@
+package util
+
+// NodeState is storage node state processed by Object service.
+type NodeState interface {
+	// IsMaintenance checks if node is under maintenance. Node MUST NOT serve
+	// local object operations. Node MUST respond with apistatus.NodeUnderMaintenance
+	// error if IsMaintenance returns true.
+	IsMaintenance() bool
+}