Implement streaming CRI methods in dockershim

pkg/kubelet/server/streaming/BUILD

@@ -12,7 +12,10 @@ load(
 
 go_library(
     name = "go_default_library",
-    srcs = ["server.go"],
+    srcs = [
+        "errors.go",
+        "server.go",
+    ],
     tags = ["automanaged"],
     deps = [
         "//pkg/kubelet/api/v1alpha1/runtime:go_default_library",
@@ -21,6 +24,7 @@ go_library(
         "//pkg/types:go_default_library",
         "//pkg/util/term:go_default_library",
         "//vendor:github.com/emicklei/go-restful",
+        "//vendor:google.golang.org/grpc/codes",
         "//vendor:k8s.io/client-go/pkg/api",
     ],
 )

pkg/kubelet/server/streaming/errors.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2016 The Kubernetes 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 streaming
+
+import (
+	"fmt"
+	"time"
+
+	"google.golang.org/grpc/codes"
+)
+
+type ResponseError struct {
+	Err  string
+	Code codes.Code
+}
+
+func (e *ResponseError) Error() string {
+	return e.Err
+}
+
+func ErrorStreamingDisabled(method string) error {
+	return &ResponseError{
+		Err:  fmt.Sprintf("streaming method %s disabled", method),
+		Code: codes.NotFound,
+	}
+}
+
+func ErrorTimeout(op string, timeout time.Duration) error {
+	return &ResponseError{
+		Err:  fmt.Sprintf("%s timed out after %s", op, timeout.String()),
+		Code: codes.DeadlineExceeded,
+	}
+}