mirror of https://github.com/docker/cli.git
73 lines
2.2 KiB
Go
73 lines
2.2 KiB
Go
/*
|
|
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 versioned
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
"k8s.io/apimachinery/pkg/runtime/serializer/streaming"
|
|
"k8s.io/apimachinery/pkg/watch"
|
|
)
|
|
|
|
// Decoder implements the watch.Decoder interface for io.ReadClosers that
|
|
// have contents which consist of a series of watchEvent objects encoded
|
|
// with the given streaming decoder. The internal objects will be then
|
|
// decoded by the embedded decoder.
|
|
type Decoder struct {
|
|
decoder streaming.Decoder
|
|
embeddedDecoder runtime.Decoder
|
|
}
|
|
|
|
// NewDecoder creates an Decoder for the given writer and codec.
|
|
func NewDecoder(decoder streaming.Decoder, embeddedDecoder runtime.Decoder) *Decoder {
|
|
return &Decoder{
|
|
decoder: decoder,
|
|
embeddedDecoder: embeddedDecoder,
|
|
}
|
|
}
|
|
|
|
// Decode blocks until it can return the next object in the reader. Returns an error
|
|
// if the reader is closed or an object can't be decoded.
|
|
func (d *Decoder) Decode() (watch.EventType, runtime.Object, error) {
|
|
var got metav1.WatchEvent
|
|
res, _, err := d.decoder.Decode(nil, &got)
|
|
if err != nil {
|
|
return "", nil, err
|
|
}
|
|
if res != &got {
|
|
return "", nil, fmt.Errorf("unable to decode to metav1.Event")
|
|
}
|
|
switch got.Type {
|
|
case string(watch.Added), string(watch.Modified), string(watch.Deleted), string(watch.Error), string(watch.Bookmark):
|
|
default:
|
|
return "", nil, fmt.Errorf("got invalid watch event type: %v", got.Type)
|
|
}
|
|
|
|
obj, err := runtime.Decode(d.embeddedDecoder, got.Object.Raw)
|
|
if err != nil {
|
|
return "", nil, fmt.Errorf("unable to decode watch event: %v", err)
|
|
}
|
|
return watch.EventType(got.Type), obj, nil
|
|
}
|
|
|
|
// Close closes the underlying r.
|
|
func (d *Decoder) Close() {
|
|
d.decoder.Close()
|
|
}
|