client: move namespaces client to containerd package

Signed-off-by: Jess Valarezo <valarezo.jessica@gmail.com>

namespaces.go

@@ -0,0 +1,97 @@
+package containerd
+
+import (
+	"context"
+	"strings"
+
+	api "github.com/containerd/containerd/api/services/namespaces/v1"
+	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/namespaces"
+	"github.com/gogo/protobuf/types"
+)
+
+// NewNamespaceStoreFromClient returns a new namespace store
+func NewNamespaceStoreFromClient(client api.NamespacesClient) namespaces.Store {
+	return &remoteNamespaces{client: client}
+}
+
+type remoteNamespaces struct {
+	client api.NamespacesClient
+}
+
+func (r *remoteNamespaces) Create(ctx context.Context, namespace string, labels map[string]string) error {
+	var req api.CreateNamespaceRequest
+
+	req.Namespace = api.Namespace{
+		Name:   namespace,
+		Labels: labels,
+	}
+
+	_, err := r.client.Create(ctx, &req)
+	if err != nil {
+		return errdefs.FromGRPC(err)
+	}
+
+	return nil
+}
+
+func (r *remoteNamespaces) Labels(ctx context.Context, namespace string) (map[string]string, error) {
+	var req api.GetNamespaceRequest
+	req.Name = namespace
+
+	resp, err := r.client.Get(ctx, &req)
+	if err != nil {
+		return nil, errdefs.FromGRPC(err)
+	}
+
+	return resp.Namespace.Labels, nil
+}
+
+func (r *remoteNamespaces) SetLabel(ctx context.Context, namespace, key, value string) error {
+	var req api.UpdateNamespaceRequest
+
+	req.Namespace = api.Namespace{
+		Name:   namespace,
+		Labels: map[string]string{key: value},
+	}
+
+	req.UpdateMask = &types.FieldMask{
+		Paths: []string{strings.Join([]string{"labels", key}, ".")},
+	}
+
+	_, err := r.client.Update(ctx, &req)
+	if err != nil {
+		return errdefs.FromGRPC(err)
+	}
+
+	return nil
+}
+
+func (r *remoteNamespaces) List(ctx context.Context) ([]string, error) {
+	var req api.ListNamespacesRequest
+
+	resp, err := r.client.List(ctx, &req)
+	if err != nil {
+		return nil, errdefs.FromGRPC(err)
+	}
+
+	var namespaces []string
+
+	for _, ns := range resp.Namespaces {
+		namespaces = append(namespaces, ns.Name)
+	}
+
+	return namespaces, nil
+}
+
+func (r *remoteNamespaces) Delete(ctx context.Context, namespace string) error {
+	var req api.DeleteNamespaceRequest
+
+	req.Name = namespace
+	_, err := r.client.Delete(ctx, &req)
+	if err != nil {
+		return errdefs.FromGRPC(err)
+	}
+
+	return nil
+}