[management] Add peer lock to grpc server (#2859)

* add peer lock to grpc server

* remove sleep and put db update first

* don't export lock method

management/server/grpcserver.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"net/netip"
 	"strings"
+	"sync"
 	"time"
 
 	pb "github.com/golang/protobuf/proto" // nolint
@@ -38,6 +39,7 @@ type GRPCServer struct {
 	jwtClaimsExtractor *jwtclaims.ClaimsExtractor
 	appMetrics         telemetry.AppMetrics
 	ephemeralManager   *EphemeralManager
+	peerLocks          sync.Map
 }
 
 // NewServer creates a new Management server
@@ -148,6 +150,13 @@ func (s *GRPCServer) Sync(req *proto.EncryptedMessage, srv proto.ManagementServi
 	// nolint:staticcheck
 	ctx = context.WithValue(ctx, nbContext.PeerIDKey, peerKey.String())
 
+	unlock := s.acquirePeerLockByUID(ctx, peerKey.String())
+	defer func() {
+		if unlock != nil {
+			unlock()
+		}
+	}()
+
 	accountID, err := s.accountManager.GetAccountIDForPeerKey(ctx, peerKey.String())
 	if err != nil {
 		// nolint:staticcheck
@@ -190,6 +199,9 @@ func (s *GRPCServer) Sync(req *proto.EncryptedMessage, srv proto.ManagementServi
 		s.appMetrics.GRPCMetrics().CountSyncRequestDuration(time.Since(reqStart))
 	}
 
+	unlock()
+	unlock = nil
+
 	return s.handleUpdates(ctx, accountID, peerKey, peer, updates, srv)
 }
 
@@ -245,9 +257,12 @@ func (s *GRPCServer) sendUpdate(ctx context.Context, accountID string, peerKey w
 }
 
 func (s *GRPCServer) cancelPeerRoutines(ctx context.Context, accountID string, peer *nbpeer.Peer) {
+	unlock := s.acquirePeerLockByUID(ctx, peer.Key)
+	defer unlock()
+
+	_ = s.accountManager.OnPeerDisconnected(ctx, accountID, peer.Key)
 	s.peersUpdateManager.CloseChannel(ctx, peer.ID)
 	s.secretsManager.CancelRefresh(peer.ID)
-	_ = s.accountManager.OnPeerDisconnected(ctx, accountID, peer.Key)
 	s.ephemeralManager.OnPeerDisconnected(ctx, peer)
 }
 
@@ -274,6 +289,24 @@ func (s *GRPCServer) validateToken(ctx context.Context, jwtToken string) (string
 	return claims.UserId, nil
 }
 
+func (s *GRPCServer) acquirePeerLockByUID(ctx context.Context, uniqueID string) (unlock func()) {
+	log.WithContext(ctx).Tracef("acquiring peer lock for ID %s", uniqueID)
+
+	start := time.Now()
+	value, _ := s.peerLocks.LoadOrStore(uniqueID, &sync.RWMutex{})
+	mtx := value.(*sync.RWMutex)
+	mtx.Lock()
+	log.WithContext(ctx).Tracef("acquired peer lock for ID %s in %v", uniqueID, time.Since(start))
+	start = time.Now()
+
+	unlock = func() {
+		mtx.Unlock()
+		log.WithContext(ctx).Tracef("released peer lock for ID %s in %v", uniqueID, time.Since(start))
+	}
+
+	return unlock
+}
+
 // maps internal internalStatus.Error to gRPC status.Error
 func mapError(ctx context.Context, err error) error {
 	if e, ok := internalStatus.FromError(err); ok {