Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/k8s.io/apimachinery/pkg/runtime/serializer/recognizer/recognizer.go b/vendor/k8s.io/apimachinery/pkg/runtime/serializer/recognizer/recognizer.go
new file mode 100644
index 0000000..38497ab
--- /dev/null
+++ b/vendor/k8s.io/apimachinery/pkg/runtime/serializer/recognizer/recognizer.go
@@ -0,0 +1,127 @@
+/*
+Copyright 2014 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 recognizer
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "io"
+
+ "k8s.io/apimachinery/pkg/runtime"
+ "k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+type RecognizingDecoder interface {
+ runtime.Decoder
+ // RecognizesData should return true if the input provided in the provided reader
+ // belongs to this decoder, or an error if the data could not be read or is ambiguous.
+ // Unknown is true if the data could not be determined to match the decoder type.
+ // Decoders should assume that they can read as much of peek as they need (as the caller
+ // provides) and may return unknown if the data provided is not sufficient to make a
+ // a determination. When peek returns EOF that may mean the end of the input or the
+ // end of buffered input - recognizers should return the best guess at that time.
+ RecognizesData(peek io.Reader) (ok, unknown bool, err error)
+}
+
+// NewDecoder creates a decoder that will attempt multiple decoders in an order defined
+// by:
+//
+// 1. The decoder implements RecognizingDecoder and identifies the data
+// 2. All other decoders, and any decoder that returned true for unknown.
+//
+// The order passed to the constructor is preserved within those priorities.
+func NewDecoder(decoders ...runtime.Decoder) runtime.Decoder {
+ return &decoder{
+ decoders: decoders,
+ }
+}
+
+type decoder struct {
+ decoders []runtime.Decoder
+}
+
+var _ RecognizingDecoder = &decoder{}
+
+func (d *decoder) RecognizesData(peek io.Reader) (bool, bool, error) {
+ var (
+ lastErr error
+ anyUnknown bool
+ )
+ data, _ := bufio.NewReaderSize(peek, 1024).Peek(1024)
+ for _, r := range d.decoders {
+ switch t := r.(type) {
+ case RecognizingDecoder:
+ ok, unknown, err := t.RecognizesData(bytes.NewBuffer(data))
+ if err != nil {
+ lastErr = err
+ continue
+ }
+ anyUnknown = anyUnknown || unknown
+ if !ok {
+ continue
+ }
+ return true, false, nil
+ }
+ }
+ return false, anyUnknown, lastErr
+}
+
+func (d *decoder) Decode(data []byte, gvk *schema.GroupVersionKind, into runtime.Object) (runtime.Object, *schema.GroupVersionKind, error) {
+ var (
+ lastErr error
+ skipped []runtime.Decoder
+ )
+
+ // try recognizers, record any decoders we need to give a chance later
+ for _, r := range d.decoders {
+ switch t := r.(type) {
+ case RecognizingDecoder:
+ buf := bytes.NewBuffer(data)
+ ok, unknown, err := t.RecognizesData(buf)
+ if err != nil {
+ lastErr = err
+ continue
+ }
+ if unknown {
+ skipped = append(skipped, t)
+ continue
+ }
+ if !ok {
+ continue
+ }
+ return r.Decode(data, gvk, into)
+ default:
+ skipped = append(skipped, t)
+ }
+ }
+
+ // try recognizers that returned unknown or didn't recognize their data
+ for _, r := range skipped {
+ out, actual, err := r.Decode(data, gvk, into)
+ if err != nil {
+ lastErr = err
+ continue
+ }
+ return out, actual, nil
+ }
+
+ if lastErr == nil {
+ lastErr = fmt.Errorf("no serialization format matched the provided data")
+ }
+ return nil, nil, lastErr
+}