istio.io/istio@v0.0.0-20240520182934-d79c90f27776/pkg/xds/server_test.go (about)

     1  // Copyright Istio Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package xds
    16  
    17  import (
    18  	"testing"
    19  
    20  	discovery "github.com/envoyproxy/go-control-plane/envoy/service/discovery/v3"
    21  
    22  	"istio.io/istio/pkg/model"
    23  )
    24  
    25  type TestProxy struct {
    26  	WatchedResources map[string]*WatchedResource
    27  }
    28  
    29  func (p *TestProxy) DeleteWatchedResource(url string) {
    30  	delete(p.WatchedResources, url)
    31  }
    32  
    33  func (p *TestProxy) GetWatchedResource(url string) *WatchedResource {
    34  	return p.WatchedResources[url]
    35  }
    36  
    37  func (p *TestProxy) NewWatchedResource(url string, names []string) {
    38  	p.WatchedResources[url] = &WatchedResource{ResourceNames: names}
    39  }
    40  
    41  func (p *TestProxy) UpdateWatchedResource(url string, f func(*WatchedResource) *WatchedResource) {
    42  	p.WatchedResources[url] = f(p.WatchedResources[url])
    43  }
    44  
    45  func (p *TestProxy) GetID() string {
    46  	return ""
    47  }
    48  
    49  func TestShouldRespond(t *testing.T) {
    50  	tests := []struct {
    51  		name     string
    52  		proxy    *TestProxy
    53  		request  *discovery.DiscoveryRequest
    54  		response bool
    55  	}{
    56  		{
    57  			name: "initial request",
    58  			proxy: &TestProxy{
    59  				WatchedResources: map[string]*WatchedResource{},
    60  			},
    61  			request: &discovery.DiscoveryRequest{
    62  				TypeUrl: model.ClusterType,
    63  			},
    64  			response: true,
    65  		},
    66  		{
    67  			name: "ack",
    68  			proxy: &TestProxy{
    69  				WatchedResources: map[string]*WatchedResource{
    70  					model.ClusterType: {
    71  						NonceSent: "nonce",
    72  					},
    73  				},
    74  			},
    75  			request: &discovery.DiscoveryRequest{
    76  				TypeUrl:       model.ClusterType,
    77  				VersionInfo:   "v1",
    78  				ResponseNonce: "nonce",
    79  			},
    80  			response: false,
    81  		},
    82  		{
    83  			name: "ack forced",
    84  			proxy: &TestProxy{
    85  				WatchedResources: map[string]*WatchedResource{
    86  					model.EndpointType: {
    87  						NonceSent:     "nonce",
    88  						AlwaysRespond: true,
    89  						ResourceNames: []string{"my-resource"},
    90  					},
    91  				},
    92  			},
    93  			request: &discovery.DiscoveryRequest{
    94  				TypeUrl:       model.EndpointType,
    95  				VersionInfo:   "v1",
    96  				ResponseNonce: "nonce",
    97  				ResourceNames: []string{"my-resource"},
    98  			},
    99  			response: true,
   100  		},
   101  		{
   102  			name: "nack",
   103  			proxy: &TestProxy{
   104  				WatchedResources: map[string]*WatchedResource{
   105  					model.ClusterType: {
   106  						NonceSent: "nonce",
   107  					},
   108  				},
   109  			},
   110  			request: &discovery.DiscoveryRequest{
   111  				TypeUrl:       model.ClusterType,
   112  				VersionInfo:   "v1",
   113  				ResponseNonce: "stale nonce",
   114  			},
   115  			response: false,
   116  		},
   117  		{
   118  			name: "reconnect",
   119  			proxy: &TestProxy{
   120  				WatchedResources: map[string]*WatchedResource{},
   121  			},
   122  			request: &discovery.DiscoveryRequest{
   123  				TypeUrl:       model.ClusterType,
   124  				VersionInfo:   "v1",
   125  				ResponseNonce: "reconnect nonce",
   126  			},
   127  			response: true,
   128  		},
   129  		{
   130  			name: "resources change",
   131  			proxy: &TestProxy{
   132  				WatchedResources: map[string]*WatchedResource{
   133  					model.EndpointType: {
   134  						NonceSent:     "nonce",
   135  						ResourceNames: []string{"cluster1"},
   136  					},
   137  				},
   138  			},
   139  			request: &discovery.DiscoveryRequest{
   140  				TypeUrl:       model.EndpointType,
   141  				VersionInfo:   "v1",
   142  				ResponseNonce: "nonce",
   143  				ResourceNames: []string{"cluster1", "cluster2"},
   144  			},
   145  			response: true,
   146  		},
   147  		{
   148  			name: "ack with same resources",
   149  			proxy: &TestProxy{
   150  				WatchedResources: map[string]*WatchedResource{
   151  					model.EndpointType: {
   152  						NonceSent:     "nonce",
   153  						ResourceNames: []string{"cluster2", "cluster1"},
   154  					},
   155  				},
   156  			},
   157  			request: &discovery.DiscoveryRequest{
   158  				TypeUrl:       model.EndpointType,
   159  				VersionInfo:   "v1",
   160  				ResponseNonce: "nonce",
   161  				ResourceNames: []string{"cluster1", "cluster2"},
   162  			},
   163  			response: false,
   164  		},
   165  		{
   166  			name: "unsubscribe EDS",
   167  			proxy: &TestProxy{
   168  				WatchedResources: map[string]*WatchedResource{
   169  					model.EndpointType: {
   170  						NonceSent:     "nonce",
   171  						ResourceNames: []string{"cluster2", "cluster1"},
   172  					},
   173  				},
   174  			},
   175  			request: &discovery.DiscoveryRequest{
   176  				TypeUrl:       model.EndpointType,
   177  				VersionInfo:   "v1",
   178  				ResponseNonce: "nonce",
   179  				ResourceNames: []string{},
   180  			},
   181  			response: false,
   182  		},
   183  	}
   184  
   185  	for _, tt := range tests {
   186  		t.Run(tt.name, func(t *testing.T) {
   187  			if response, _ := ShouldRespond(tt.proxy, "test", tt.request); response != tt.response {
   188  				t.Fatalf("Unexpected value for response, expected %v, got %v", tt.response, response)
   189  			}
   190  			if tt.name != "reconnect" && tt.response {
   191  				if tt.proxy.WatchedResources[tt.request.TypeUrl].NonceAcked != tt.request.ResponseNonce {
   192  					t.Fatalf("Version & Nonce not updated properly")
   193  				}
   194  			}
   195  		})
   196  	}
   197  }