github.com/aclisp/heapster@v0.19.2-0.20160613100040-51756f899a96/Godeps/_workspace/src/k8s.io/kubernetes/pkg/watch/versioned/encoder.go (about)

     1  /*
     2  Copyright 2014 The Kubernetes Authors All rights reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package versioned
    18  
    19  import (
    20  	"encoding/json"
    21  
    22  	"k8s.io/kubernetes/pkg/runtime"
    23  	"k8s.io/kubernetes/pkg/runtime/serializer/streaming"
    24  	"k8s.io/kubernetes/pkg/watch"
    25  )
    26  
    27  // Encoder serializes watch.Events into io.Writer. The internal objects
    28  // are encoded using embedded encoder, and the outer Event is serialized
    29  // using encoder.
    30  type Encoder struct {
    31  	encoder         streaming.Encoder
    32  	embeddedEncoder runtime.Encoder
    33  }
    34  
    35  func NewEncoder(encoder streaming.Encoder, embeddedEncoder runtime.Encoder) *Encoder {
    36  	return &Encoder{
    37  		encoder:         encoder,
    38  		embeddedEncoder: embeddedEncoder,
    39  	}
    40  }
    41  
    42  // Encode writes an event to the writer. Returns an error
    43  // if the writer is closed or an object can't be encoded.
    44  func (e *Encoder) Encode(event *watch.Event) error {
    45  	data, err := runtime.Encode(e.embeddedEncoder, event.Object)
    46  	if err != nil {
    47  		return err
    48  	}
    49  	// FIXME: get rid of json.RawMessage.
    50  	return e.encoder.Encode(&Event{string(event.Type), runtime.RawExtension{Raw: json.RawMessage(data)}})
    51  }