Move etcd storage to pkg/storage/etcd

pkg/storage/util.go

@@ -0,0 +1,51 @@
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+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 storage
+
+import (
+	"strconv"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/fielderrors"
+)
+
+type SimpleUpdateFunc func(runtime.Object) (runtime.Object, error)
+
+// SimpleUpdateFunc converts SimpleUpdateFunc into UpdateFunc
+func SimpleUpdate(fn SimpleUpdateFunc) UpdateFunc {
+	return func(input runtime.Object, _ ResponseMeta) (runtime.Object, *uint64, error) {
+		out, err := fn(input)
+		return out, nil, err
+	}
+}
+
+// ParseWatchResourceVersion takes a resource version argument and converts it to
+// the etcd version we should pass to helper.Watch(). Because resourceVersion is
+// an opaque value, the default watch behavior for non-zero watch is to watch
+// the next value (if you pass "1", you will see updates from "2" onwards).
+func ParseWatchResourceVersion(resourceVersion, kind string) (uint64, error) {
+	if resourceVersion == "" || resourceVersion == "0" {
+		return 0, nil
+	}
+	version, err := strconv.ParseUint(resourceVersion, 10, 64)
+	if err != nil {
+		// TODO: Does this need to be a ValidationErrorList?  I can't convince myself it does.
+		return 0, errors.NewInvalid(kind, "", fielderrors.ValidationErrorList{fielderrors.NewFieldInvalid("resourceVersion", resourceVersion, err.Error())})
+	}
+	return version + 1, nil
+}