Sandbox API: Move remote impls to /sandbox/proxy

Following how some of the other stores/services are returned in the
client package, it makes sense to me to move the remoteFooBars in
the sandbox API to a proxy sub-package under /sandbox. Given this
has only been in a 1.7 beta, I hope this is fine to move around still.

Signed-off-by: Danny Canter <danny@dcantah.dev>

sandbox/proxy/controller.go

@@ -0,0 +1,91 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package proxy
+
+import (
+	"context"
+
+	api "github.com/containerd/containerd/api/services/sandbox/v1"
+	"github.com/containerd/containerd/errdefs"
+	sb "github.com/containerd/containerd/sandbox"
+)
+
+// remoteSandboxController is a low level GRPC client for containerd's sandbox controller service
+type remoteSandboxController struct {
+	client api.ControllerClient
+}
+
+var _ sb.Controller = (*remoteSandboxController)(nil)
+
+// NewSandboxController creates a client for a sandbox controller
+func NewSandboxController(client api.ControllerClient) sb.Controller {
+	return &remoteSandboxController{client: client}
+}
+
+func (s *remoteSandboxController) Create(ctx context.Context, sandboxID string) error {
+	_, err := s.client.Create(ctx, &api.ControllerCreateRequest{SandboxID: sandboxID})
+	if err != nil {
+		return errdefs.FromGRPC(err)
+	}
+
+	return nil
+}
+
+func (s *remoteSandboxController) Start(ctx context.Context, sandboxID string) (*api.ControllerStartResponse, error) {
+	resp, err := s.client.Start(ctx, &api.ControllerStartRequest{SandboxID: sandboxID})
+	if err != nil {
+		return nil, errdefs.FromGRPC(err)
+	}
+
+	return resp, nil
+}
+
+func (s *remoteSandboxController) Stop(ctx context.Context, sandboxID string) (*api.ControllerStopResponse, error) {
+	resp, err := s.client.Stop(ctx, &api.ControllerStopRequest{SandboxID: sandboxID})
+	if err != nil {
+		return nil, errdefs.FromGRPC(err)
+	}
+
+	return resp, nil
+}
+
+func (s *remoteSandboxController) Delete(ctx context.Context, sandboxID string) (*api.ControllerDeleteResponse, error) {
+	resp, err := s.client.Delete(ctx, &api.ControllerDeleteRequest{SandboxID: sandboxID})
+	if err != nil {
+		return nil, errdefs.FromGRPC(err)
+	}
+
+	return resp, nil
+}
+
+func (s *remoteSandboxController) Wait(ctx context.Context, sandboxID string) (*api.ControllerWaitResponse, error) {
+	resp, err := s.client.Wait(ctx, &api.ControllerWaitRequest{SandboxID: sandboxID})
+	if err != nil {
+		return nil, errdefs.FromGRPC(err)
+	}
+
+	return resp, nil
+}
+
+func (s *remoteSandboxController) Status(ctx context.Context, sandboxID string) (*api.ControllerStatusResponse, error) {
+	resp, err := s.client.Status(ctx, &api.ControllerStatusRequest{SandboxID: sandboxID})
+	if err != nil {
+		return nil, errdefs.FromGRPC(err)
+	}
+
+	return resp, nil
+}