[#1255] node/session: Create separate dir for in-memory storage

Move in-memory session storage to the separate directory of `storage`. It is
done for future support of different kind of session storages.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

cmd/neofs-node/config.go

@@ -37,7 +37,7 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/services/object/acl/eacl"
 	trustcontroller "github.com/nspcc-dev/neofs-node/pkg/services/reputation/local/controller"
 	truststorage "github.com/nspcc-dev/neofs-node/pkg/services/reputation/local/storage"
-	tokenStorage "github.com/nspcc-dev/neofs-node/pkg/services/session/storage"
+	tokenStorage "github.com/nspcc-dev/neofs-node/pkg/services/session/storage/temporary"
 	"github.com/nspcc-dev/neofs-node/pkg/services/util/response"
 	"github.com/nspcc-dev/neofs-node/pkg/util"
 	"github.com/nspcc-dev/neofs-node/pkg/util/logger"

cmd/neofs-node/session.go

@@ -6,11 +6,11 @@ import (
 	"github.com/nspcc-dev/neofs-node/pkg/morph/event/netmap"
 	sessionTransportGRPC "github.com/nspcc-dev/neofs-node/pkg/network/transport/session/grpc"
 	sessionSvc "github.com/nspcc-dev/neofs-node/pkg/services/session"
-	"github.com/nspcc-dev/neofs-node/pkg/services/session/storage"
+	"github.com/nspcc-dev/neofs-node/pkg/services/session/storage/temporary"
 )
 
 func initSessionService(c *cfg) {
-	c.privateTokenStore = storage.New()
+	c.privateTokenStore = temporary.NewTokenStore()
 	addNewEpochNotificationHandler(c, func(ev event.Event) {
 		c.privateTokenStore.RemoveOld(ev.(netmap.NewEpoch).EpochNumber())
 	})

pkg/services/object/util/key.go

@@ -4,7 +4,7 @@ import (
 	"crypto/ecdsa"
 
 	"github.com/nspcc-dev/neofs-node/pkg/core/netmap"
-	"github.com/nspcc-dev/neofs-node/pkg/services/session/storage"
+	"github.com/nspcc-dev/neofs-node/pkg/services/session/storage/temporary"
 	apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
 	"github.com/nspcc-dev/neofs-sdk-go/session"
 )
@@ -13,13 +13,13 @@ import (
 type KeyStorage struct {
 	key *ecdsa.PrivateKey
 
-	tokenStore *storage.TokenStore
+	tokenStore *temporary.TokenStore
 
 	networkState netmap.State
 }
 
 // NewKeyStorage creates, initializes and returns new KeyStorage instance.
-func NewKeyStorage(localKey *ecdsa.PrivateKey, tokenStore *storage.TokenStore, net netmap.State) *KeyStorage {
+func NewKeyStorage(localKey *ecdsa.PrivateKey, tokenStore *temporary.TokenStore, net netmap.State) *KeyStorage {
 	return &KeyStorage{
 		key:          localKey,
 		tokenStore:   tokenStore,

pkg/services/object/util/key_test.go

@@ -9,7 +9,7 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	sessionV2 "github.com/nspcc-dev/neofs-api-go/v2/session"
 	"github.com/nspcc-dev/neofs-node/pkg/services/object/util"
-	tokenStorage "github.com/nspcc-dev/neofs-node/pkg/services/session/storage"
+	tokenStorage "github.com/nspcc-dev/neofs-node/pkg/services/session/storage/temporary"
 	"github.com/nspcc-dev/neofs-sdk-go/session"
 	"github.com/stretchr/testify/require"
 )
@@ -18,7 +18,7 @@ func TestNewKeyStorage(t *testing.T) {
 	nodeKey, err := keys.NewPrivateKey()
 	require.NoError(t, err)
 
-	tokenStor := tokenStorage.New()
+	tokenStor := tokenStorage.NewTokenStore()
 	stor := util.NewKeyStorage(&nodeKey.PrivateKey, tokenStor, mockedNetworkState{42})
 
 	t.Run("node key", func(t *testing.T) {

pkg/services/session/storage/temporary/executor.go

@@ -1,4 +1,4 @@
-package storage
+package temporary
 
 import (
 	"context"
@@ -8,6 +8,7 @@ import (
 	"github.com/mr-tron/base58"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neofs-api-go/v2/session"
+	"github.com/nspcc-dev/neofs-node/pkg/services/session/storage"
 	"github.com/nspcc-dev/neofs-sdk-go/owner"
 )
 
@@ -32,14 +33,15 @@ func (s *TokenStore) Create(ctx context.Context, body *session.CreateRequestBody
 		return nil, err
 	}
 
+	privateToken := new(storage.PrivateToken)
+	privateToken.SetSessionKey(&sk.PrivateKey)
+	privateToken.SetExpiredAt(body.GetExpiration())
+
 	s.mtx.Lock()
 	s.tokens[key{
 		tokenID: base58.Encode(uidBytes),
 		ownerID: base58.Encode(ownerBytes),
-	}] = &PrivateToken{
-		sessionKey: &sk.PrivateKey,
-		exp:        body.GetExpiration(),
-	}
+	}] = privateToken
 	s.mtx.Unlock()
 
 	res := new(session.CreateResponseBody)

pkg/services/session/storage/temporary/storage.go

@@ -1,9 +1,10 @@
-package storage
+package temporary
 
 import (
 	"sync"
 
 	"github.com/mr-tron/base58"
+	"github.com/nspcc-dev/neofs-node/pkg/services/session/storage"
 	"github.com/nspcc-dev/neofs-sdk-go/owner"
 )
 
@@ -12,26 +13,30 @@ type key struct {
 	ownerID string
 }
 
+// TokenStore is an in-memory session token store.
+// It allows creating (storing), retrieving and
+// expiring (removing) session tokens.
+// Must be created only via calling NewTokenStore.
 type TokenStore struct {
 	mtx *sync.RWMutex
 
-	tokens map[key]*PrivateToken
+	tokens map[key]*storage.PrivateToken
 }
 
-// New creates, initializes and returns a new TokenStore instance.
+// NewTokenStore creates, initializes and returns a new TokenStore instance.
 //
 // The elements of the instance are stored in the map.
-func New() *TokenStore {
+func NewTokenStore() *TokenStore {
 	return &TokenStore{
 		mtx:    new(sync.RWMutex),
-		tokens: make(map[key]*PrivateToken),
+		tokens: make(map[key]*storage.PrivateToken),
 	}
 }
 
 // Get returns private token corresponding to the given identifiers.
 //
 // Returns nil is there is no element in storage.
-func (s *TokenStore) Get(ownerID *owner.ID, tokenID []byte) *PrivateToken {
+func (s *TokenStore) Get(ownerID *owner.ID, tokenID []byte) *storage.PrivateToken {
 	ownerBytes, err := ownerID.Marshal()
 	if err != nil {
 		panic(err)

pkg/services/session/storage/types.go

@@ -11,6 +11,16 @@ type PrivateToken struct {
 	exp uint64
 }
 
+// SetSessionKey sets a private session key.
+func (t *PrivateToken) SetSessionKey(sessionKey *ecdsa.PrivateKey) {
+	t.sessionKey = sessionKey
+}
+
+// SetExpiredAt sets epoch number until token is valid.
+func (t *PrivateToken) SetExpiredAt(exp uint64) {
+	t.exp = exp
+}
+
 // SessionKey returns the private session key.
 func (t *PrivateToken) SessionKey() *ecdsa.PrivateKey {
 	return t.sessionKey