mirror of https://github.com/docker/cli.git
73 lines
2.2 KiB
Go
73 lines
2.2 KiB
Go
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/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package versioned
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import (
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"fmt"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/serializer/streaming"
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"k8s.io/apimachinery/pkg/watch"
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)
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// Decoder implements the watch.Decoder interface for io.ReadClosers that
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// have contents which consist of a series of watchEvent objects encoded
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// with the given streaming decoder. The internal objects will be then
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// decoded by the embedded decoder.
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type Decoder struct {
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decoder streaming.Decoder
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embeddedDecoder runtime.Decoder
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}
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// NewDecoder creates an Decoder for the given writer and codec.
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func NewDecoder(decoder streaming.Decoder, embeddedDecoder runtime.Decoder) *Decoder {
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return &Decoder{
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decoder: decoder,
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embeddedDecoder: embeddedDecoder,
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}
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}
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// Decode blocks until it can return the next object in the reader. Returns an error
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// if the reader is closed or an object can't be decoded.
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func (d *Decoder) Decode() (watch.EventType, runtime.Object, error) {
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var got metav1.WatchEvent
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res, _, err := d.decoder.Decode(nil, &got)
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if err != nil {
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return "", nil, err
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}
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if res != &got {
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return "", nil, fmt.Errorf("unable to decode to metav1.Event")
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}
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switch got.Type {
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case string(watch.Added), string(watch.Modified), string(watch.Deleted), string(watch.Error):
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default:
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return "", nil, fmt.Errorf("got invalid watch event type: %v", got.Type)
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}
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obj, err := runtime.Decode(d.embeddedDecoder, got.Object.Raw)
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if err != nil {
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return "", nil, fmt.Errorf("unable to decode watch event: %v", err)
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}
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return watch.EventType(got.Type), obj, nil
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}
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// Close closes the underlying r.
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func (d *Decoder) Close() {
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d.decoder.Close()
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}
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