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Source file src/k8s.io/client-go/rest/watch/encoder.go

Documentation: k8s.io/client-go/rest/watch

     1  /*
     2  Copyright 2014 The Kubernetes Authors.
     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  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    23  	"k8s.io/apimachinery/pkg/runtime"
    24  	"k8s.io/apimachinery/pkg/runtime/serializer/streaming"
    25  	"k8s.io/apimachinery/pkg/watch"
    26  )
    27  
    28  // Encoder serializes watch.Events into io.Writer. The internal objects
    29  // are encoded using embedded encoder, and the outer Event is serialized
    30  // using encoder.
    31  // TODO: this type is only used by tests
    32  type Encoder struct {
    33  	encoder         streaming.Encoder
    34  	embeddedEncoder runtime.Encoder
    35  }
    36  
    37  func NewEncoder(encoder streaming.Encoder, embeddedEncoder runtime.Encoder) *Encoder {
    38  	return &Encoder{
    39  		encoder:         encoder,
    40  		embeddedEncoder: embeddedEncoder,
    41  	}
    42  }
    43  
    44  // Encode writes an event to the writer. Returns an error
    45  // if the writer is closed or an object can't be encoded.
    46  func (e *Encoder) Encode(event *watch.Event) error {
    47  	data, err := runtime.Encode(e.embeddedEncoder, event.Object)
    48  	if err != nil {
    49  		return err
    50  	}
    51  	// FIXME: get rid of json.RawMessage.
    52  	return e.encoder.Encode(&metav1.WatchEvent{
    53  		Type:   string(event.Type),
    54  		Object: runtime.RawExtension{Raw: json.RawMessage(data)},
    55  	})
    56  }
    57  

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