server: implement update container resources

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

server/container_update_resources.go

@@ -1,13 +1,38 @@
 package server
 
 import (
-	"fmt"
-
+	"github.com/gogo/protobuf/proto"
+	rspec "github.com/opencontainers/runtime-spec/specs-go"
 	"golang.org/x/net/context"
 	pb "k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
 )
 
 // UpdateContainerResources updates ContainerConfig of the container.
 func (s *Server) UpdateContainerResources(ctx context.Context, req *pb.UpdateContainerResourcesRequest) (*pb.UpdateContainerResourcesResponse, error) {
-	return nil, fmt.Errorf("not implemented")
+	c, err := s.GetContainerFromRequest(req.GetContainerId())
+	if err != nil {
+		return nil, err
+	}
+	resources := toOCIResources(req.GetLinux())
+	if err := s.Runtime().UpdateContainer(c, resources); err != nil {
+		return nil, err
+	}
+	return &pb.UpdateContainerResourcesResponse{}, nil
+}
+
+// toOCIResources converts CRI resource constraints to OCI.
+func toOCIResources(r *pb.LinuxContainerResources) *rspec.LinuxResources {
+	return &rspec.LinuxResources{
+		CPU: &rspec.LinuxCPU{
+			Shares: proto.Uint64(uint64(r.GetCpuShares())),
+			Quota:  proto.Int64(r.GetCpuQuota()),
+			Period: proto.Uint64(uint64(r.GetCpuPeriod())),
+			Cpus:   r.GetCpusetCpus(),
+			Mems:   r.GetCpusetMems(),
+		},
+		Memory: &rspec.LinuxMemory{
+			Limit: proto.Int64(r.GetMemoryLimitInBytes()),
+		},
+		// TODO(runcom): OOMScoreAdj is missing
+	}
 }