decoder_test.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_test
    18  
    19  import (
    20  	"encoding/json"
    21  	"fmt"
    22  	"io"
    23  	"testing"
    24  	"time"
    25  
    26  	"k8s.io/api/core/v1"
    27  	apiequality "k8s.io/apimachinery/pkg/api/equality"
    28  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    29  	"k8s.io/apimachinery/pkg/runtime"
    30  	runtimejson "k8s.io/apimachinery/pkg/runtime/serializer/json"
    31  	"k8s.io/apimachinery/pkg/runtime/serializer/streaming"
    32  	"k8s.io/apimachinery/pkg/util/wait"
    33  	"k8s.io/apimachinery/pkg/watch"
    34  	"k8s.io/client-go/kubernetes/scheme"
    35  	restclientwatch "k8s.io/client-go/rest/watch"
    36  )
    37  
    38  // getDecoder mimics how k8s.io/client-go/rest.createSerializers creates a decoder
    39  func getDecoder() runtime.Decoder {
    40  	jsonSerializer := runtimejson.NewSerializer(runtimejson.DefaultMetaFactory, scheme.Scheme, scheme.Scheme, false)
    41  	directCodecFactory := scheme.Codecs.WithoutConversion()
    42  	return directCodecFactory.DecoderToVersion(jsonSerializer, v1.SchemeGroupVersion)
    43  }
    44  
    45  func TestDecoder(t *testing.T) {
    46  	table := []watch.EventType{watch.Added, watch.Deleted, watch.Modified, watch.Error, watch.Bookmark}
    47  
    48  	for _, eventType := range table {
    49  		out, in := io.Pipe()
    50  
    51  		decoder := restclientwatch.NewDecoder(streaming.NewDecoder(out, getDecoder()), getDecoder())
    52  		expect := &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "foo"}}
    53  		encoder := json.NewEncoder(in)
    54  		eType := eventType
    55  		errc := make(chan error)
    56  
    57  		go func() {
    58  			data, err := runtime.Encode(scheme.Codecs.LegacyCodec(v1.SchemeGroupVersion), expect)
    59  			if err != nil {
    60  				errc <- fmt.Errorf("Unexpected error %v", err)
    61  				return
    62  			}
    63  			event := metav1.WatchEvent{
    64  				Type:   string(eType),
    65  				Object: runtime.RawExtension{Raw: json.RawMessage(data)},
    66  			}
    67  			if err := encoder.Encode(&event); err != nil {
    68  				t.Errorf("Unexpected error %v", err)
    69  			}
    70  			in.Close()
    71  		}()
    72  
    73  		done := make(chan struct{})
    74  		go func() {
    75  			action, got, err := decoder.Decode()
    76  			if err != nil {
    77  				errc <- fmt.Errorf("Unexpected error %v", err)
    78  				return
    79  			}
    80  			if e, a := eType, action; e != a {
    81  				t.Errorf("Expected %v, got %v", e, a)
    82  			}
    83  			if e, a := expect, got; !apiequality.Semantic.DeepDerivative(e, a) {
    84  				t.Errorf("Expected %v, got %v", e, a)
    85  			}
    86  			t.Logf("Exited read")
    87  			close(done)
    88  		}()
    89  		select {
    90  		case err := <-errc:
    91  			t.Fatal(err)
    92  		case <-done:
    93  		}
    94  
    95  		done = make(chan struct{})
    96  		go func() {
    97  			_, _, err := decoder.Decode()
    98  			if err == nil {
    99  				t.Errorf("Unexpected nil error")
   100  			}
   101  			close(done)
   102  		}()
   103  		<-done
   104  
   105  		decoder.Close()
   106  	}
   107  }
   108  
   109  func TestDecoder_SourceClose(t *testing.T) {
   110  	out, in := io.Pipe()
   111  	decoder := restclientwatch.NewDecoder(streaming.NewDecoder(out, getDecoder()), getDecoder())
   112  
   113  	done := make(chan struct{})
   114  
   115  	go func() {
   116  		_, _, err := decoder.Decode()
   117  		if err == nil {
   118  			t.Errorf("Unexpected nil error")
   119  		}
   120  		close(done)
   121  	}()
   122  
   123  	in.Close()
   124  
   125  	select {
   126  	case <-done:
   127  		break
   128  	case <-time.After(wait.ForeverTestTimeout):
   129  		t.Error("Timeout")
   130  	}
   131  }
   132
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