// UpdateNode updates a Node referenced by NodeID with the given NodeSpec.
// - Returns `NotFound` if the Node is not found.
// - Returns `InvalidArgument` if the NodeSpec is malformed.
// - Returns an error if the update fails.
func (s *Server) UpdateNode(ctx context.Context, request *api.UpdateNodeRequest) (*api.UpdateNodeResponse, error) {
if request.NodeID == "" || request.NodeVersion == nil {
return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
if err := validateNodeSpec(request.Spec); err != nil {
return nil, err
}
var (
node *api.Node
demote bool
)
err := s.store.Update(func(tx store.Tx) error {
node = store.GetNode(tx, request.NodeID)
if node == nil {
return nil
}
// Demotion sanity checks.
if node.Spec.Role == api.NodeRoleManager && request.Spec.Role == api.NodeRoleWorker {
demote = true
managers, err := store.FindNodes(tx, store.ByRole(api.NodeRoleManager))
if err != nil {
return grpc.Errorf(codes.Internal, "internal store error: %v", err)
}
if len(managers) == 1 && managers[0].ID == node.ID {
return grpc.Errorf(codes.FailedPrecondition, "attempting to demote the last manager of the swarm")
}
}
node.Meta.Version = *request.NodeVersion
node.Spec = *request.Spec.Copy()
return store.UpdateNode(tx, node)
})
if err != nil {
return nil, err
}
if node == nil {
return nil, grpc.Errorf(codes.NotFound, "node %s not found", request.NodeID)
}
if demote && s.raft != nil {
memberlist := s.raft.GetMemberlist()
for raftID, member := range memberlist {
if member.NodeID == request.NodeID {
if err := s.raft.RemoveMember(ctx, raftID); err != nil {
return nil, err
}
break
}
}
}
return &api.UpdateNodeResponse{
Node: node,
}, nil
}
// UpdateNode updates a Node referenced by NodeID with the given NodeSpec.
// - Returns `NotFound` if the Node is not found.
// - Returns `InvalidArgument` if the NodeSpec is malformed.
// - Returns an error if the update fails.
func (s *Server) UpdateNode(ctx context.Context, request *api.UpdateNodeRequest) (*api.UpdateNodeResponse, error) {
if request.NodeID == "" || request.NodeVersion == nil {
return nil, grpc.Errorf(codes.InvalidArgument, errInvalidArgument.Error())
}
if err := validateNodeSpec(request.Spec); err != nil {
return nil, err
}
var (
node *api.Node
member *membership.Member
)
err := s.store.Update(func(tx store.Tx) error {
node = store.GetNode(tx, request.NodeID)
if node == nil {
return grpc.Errorf(codes.NotFound, "node %s not found", request.NodeID)
}
// Demotion sanity checks.
if node.Spec.DesiredRole == api.NodeRoleManager && request.Spec.DesiredRole == api.NodeRoleWorker {
// Check for manager entries in Store.
managers, err := store.FindNodes(tx, store.ByRole(api.NodeRoleManager))
if err != nil {
return grpc.Errorf(codes.Internal, "internal store error: %v", err)
}
if len(managers) == 1 && managers[0].ID == node.ID {
return grpc.Errorf(codes.FailedPrecondition, "attempting to demote the last manager of the swarm")
}
// Check for node in memberlist
if member = s.raft.GetMemberByNodeID(request.NodeID); member == nil {
return grpc.Errorf(codes.NotFound, "can't find manager in raft memberlist")
}
// Quorum safeguard
if !s.raft.CanRemoveMember(member.RaftID) {
return grpc.Errorf(codes.FailedPrecondition, "can't remove member from the raft: this would result in a loss of quorum")
}
}
node.Meta.Version = *request.NodeVersion
node.Spec = *request.Spec.Copy()
return store.UpdateNode(tx, node)
})
if err != nil {
return nil, err
}
return &api.UpdateNodeResponse{
Node: node,
}, nil
}