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72 lines
2.2 KiB
72 lines
2.2 KiB
/* |
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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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