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| 1 | +package kubernetes |
| 2 | + |
| 3 | +import ( |
| 4 | + "errors" |
| 5 | + "fmt" |
| 6 | + "reflect" |
| 7 | + "testing" |
| 8 | + "time" |
| 9 | + |
| 10 | + "github.com/containers/kubernetes-mcp-server/internal/test" |
| 11 | + "github.com/containers/kubernetes-mcp-server/pkg/config" |
| 12 | + "github.com/stretchr/testify/suite" |
| 13 | + "k8s.io/client-go/tools/clientcmd" |
| 14 | + clientcmdapi "k8s.io/client-go/tools/clientcmd/api" |
| 15 | +) |
| 16 | + |
| 17 | +type ProviderWatchTargetsTestSuite struct { |
| 18 | + suite.Suite |
| 19 | + mockServer *test.MockServer |
| 20 | + discoveryClientHandler *test.DiscoveryClientHandler |
| 21 | + kubeconfig *clientcmdapi.Config |
| 22 | + staticConfig *config.StaticConfig |
| 23 | +} |
| 24 | + |
| 25 | +func (s *ProviderWatchTargetsTestSuite) SetupTest() { |
| 26 | + s.mockServer = test.NewMockServer() |
| 27 | + s.discoveryClientHandler = &test.DiscoveryClientHandler{} |
| 28 | + s.mockServer.Handle(s.discoveryClientHandler) |
| 29 | + |
| 30 | + s.T().Setenv("CLUSTER_STATE_POLL_INTERVAL_MS", "100") |
| 31 | + s.T().Setenv("CLUSTER_STATE_DEBOUNCE_WINDOW_MS", "50") |
| 32 | + |
| 33 | + // Add multiple fake contexts to allow testing of context changes |
| 34 | + s.kubeconfig = s.mockServer.Kubeconfig() |
| 35 | + for i := 0; i < 10; i++ { |
| 36 | + name := fmt.Sprintf("context-%d", i) |
| 37 | + s.kubeconfig.Contexts[name] = clientcmdapi.NewContext() |
| 38 | + s.kubeconfig.Contexts[name].Cluster = s.kubeconfig.Contexts[s.kubeconfig.CurrentContext].Cluster |
| 39 | + s.kubeconfig.Contexts[name].AuthInfo = s.kubeconfig.Contexts[s.kubeconfig.CurrentContext].AuthInfo |
| 40 | + } |
| 41 | + |
| 42 | + s.staticConfig = &config.StaticConfig{KubeConfig: test.KubeconfigFile(s.T(), s.kubeconfig)} |
| 43 | +} |
| 44 | + |
| 45 | +func (s *ProviderWatchTargetsTestSuite) TearDownTest() { |
| 46 | + s.mockServer.Close() |
| 47 | +} |
| 48 | + |
| 49 | +func (s *ProviderWatchTargetsTestSuite) TestClusterStateChanges() { |
| 50 | + testCases := []func() (Provider, error){ |
| 51 | + func() (Provider, error) { return newKubeConfigClusterProvider(s.staticConfig) }, |
| 52 | + func() (Provider, error) { |
| 53 | + return newSingleClusterProvider(config.ClusterProviderDisabled)(s.staticConfig) |
| 54 | + }, |
| 55 | + } |
| 56 | + for _, tc := range testCases { |
| 57 | + provider, err := tc() |
| 58 | + s.Require().NoError(err, "Expected no error from provider creation") |
| 59 | + |
| 60 | + s.Run("With provider "+reflect.TypeOf(provider).String(), func() { |
| 61 | + callback, waitForCallback := CallbackWaiter() |
| 62 | + provider.WatchTargets(callback) |
| 63 | + s.Run("Reloads provider on cluster changes", func() { |
| 64 | + s.discoveryClientHandler.Groups = append(s.discoveryClientHandler.Groups, `{"name":"alex.example.com","versions":[{"groupVersion":"alex.example.com/v1","version":"v1"}],"preferredVersion":{"groupVersion":"alex.example.com/v1","version":"v1"}}`) |
| 65 | + |
| 66 | + s.Require().NoError(waitForCallback(5 * time.Second)) |
| 67 | + // Provider-wise the watcher.ClusterState which triggers the callback has no effect. |
| 68 | + // We might consider removing it at some point? (20251202) |
| 69 | + }) |
| 70 | + }) |
| 71 | + } |
| 72 | +} |
| 73 | + |
| 74 | +func (s *ProviderWatchTargetsTestSuite) TestKubeConfigClusterProvider() { |
| 75 | + provider, err := newKubeConfigClusterProvider(s.staticConfig) |
| 76 | + s.Require().NoError(err, "Expected no error from provider creation") |
| 77 | + |
| 78 | + callback, waitForCallback := CallbackWaiter() |
| 79 | + provider.WatchTargets(callback) |
| 80 | + |
| 81 | + s.Run("KubeConfigClusterProvider updates targets (reset) on kubeconfig change", func() { |
| 82 | + s.kubeconfig.CurrentContext = "context-1" |
| 83 | + s.Require().NoError(clientcmd.WriteToFile(*s.kubeconfig, s.staticConfig.KubeConfig)) |
| 84 | + s.Require().NoError(waitForCallback(5 * time.Second)) |
| 85 | + |
| 86 | + s.Run("Replaces default target with new context", func() { |
| 87 | + s.Equal("context-1", provider.GetDefaultTarget(), "Expected default target context to be updated") |
| 88 | + }) |
| 89 | + s.Run("Adds new context to targets", func() { |
| 90 | + targets, err := provider.GetTargets(s.T().Context()) |
| 91 | + s.Require().NoError(err, "Expected no error from GetTargets") |
| 92 | + s.Contains(targets, "context-1") |
| 93 | + }) |
| 94 | + s.Run("Has derived Kubernetes for new context", func() { |
| 95 | + k, err := provider.GetDerivedKubernetes(s.T().Context(), "context-1") |
| 96 | + s.Require().NoError(err, "Expected no error from GetDerivedKubernetes for context-1") |
| 97 | + s.NotNil(k, "Expected Kubernetes from GetDerivedKubernetes for context-1") |
| 98 | + s.Run("Derived Kubernetes points to correct context", func() { |
| 99 | + cfg, err := k.AccessControlClientset().ToRawKubeConfigLoader().RawConfig() |
| 100 | + s.Require().NoError(err, "Expected no error from ToRawKubeConfigLoader") |
| 101 | + s.Equal("context-1", cfg.CurrentContext, "Expected Kubernetes to point to changed-context") |
| 102 | + }) |
| 103 | + }) |
| 104 | + |
| 105 | + s.Run("Keeps watching for further changes", func() { |
| 106 | + s.kubeconfig.CurrentContext = "context-2" |
| 107 | + s.Require().NoError(clientcmd.WriteToFile(*s.kubeconfig, s.staticConfig.KubeConfig)) |
| 108 | + s.Require().NoError(waitForCallback(5 * time.Second)) |
| 109 | + |
| 110 | + s.Run("Replaces default target with new context", func() { |
| 111 | + s.Equal("context-2", provider.GetDefaultTarget(), "Expected default target context to be updated") |
| 112 | + }) |
| 113 | + }) |
| 114 | + }) |
| 115 | +} |
| 116 | + |
| 117 | +func (s *ProviderWatchTargetsTestSuite) TestSingleClusterProvider() { |
| 118 | + provider, err := newSingleClusterProvider(config.ClusterProviderDisabled)(s.staticConfig) |
| 119 | + s.Require().NoError(err, "Expected no error from provider creation") |
| 120 | + |
| 121 | + callback, waitForCallback := CallbackWaiter() |
| 122 | + provider.WatchTargets(callback) |
| 123 | + |
| 124 | + s.Run("SingleClusterProvider reloads/resets on kubeconfig change", func() { |
| 125 | + s.kubeconfig.CurrentContext = "context-1" |
| 126 | + s.Require().NoError(clientcmd.WriteToFile(*s.kubeconfig, s.staticConfig.KubeConfig)) |
| 127 | + s.Require().NoError(waitForCallback(5 * time.Second)) |
| 128 | + |
| 129 | + s.Run("Derived Kubernetes points to updated context", func() { |
| 130 | + k, err := provider.GetDerivedKubernetes(s.T().Context(), "") |
| 131 | + s.Require().NoError(err, "Expected no error from GetDerivedKubernetes for context-1") |
| 132 | + s.NotNil(k, "Expected Kubernetes from GetDerivedKubernetes for context-1") |
| 133 | + s.Run("Derived Kubernetes points to correct context", func() { |
| 134 | + cfg, err := k.AccessControlClientset().ToRawKubeConfigLoader().RawConfig() |
| 135 | + s.Require().NoError(err, "Expected no error from ToRawKubeConfigLoader") |
| 136 | + s.Equal("context-1", cfg.CurrentContext, "Expected Kubernetes to point to changed-context") |
| 137 | + }) |
| 138 | + }) |
| 139 | + |
| 140 | + s.Run("Keeps watching for further changes", func() { |
| 141 | + s.kubeconfig.CurrentContext = "context-2" |
| 142 | + s.Require().NoError(clientcmd.WriteToFile(*s.kubeconfig, s.staticConfig.KubeConfig)) |
| 143 | + s.Require().NoError(waitForCallback(5 * time.Second)) |
| 144 | + |
| 145 | + s.Run("Derived Kubernetes points to updated context", func() { |
| 146 | + k, err := provider.GetDerivedKubernetes(s.T().Context(), "") |
| 147 | + s.Require().NoError(err, "Expected no error from GetDerivedKubernetes for context-2") |
| 148 | + s.NotNil(k, "Expected Kubernetes from GetDerivedKubernetes for context-2") |
| 149 | + cfg, err := k.AccessControlClientset().ToRawKubeConfigLoader().RawConfig() |
| 150 | + s.Require().NoError(err, "Expected no error from ToRawKubeConfigLoader") |
| 151 | + s.Equal("context-2", cfg.CurrentContext, "Expected Kubernetes to point to changed-context") |
| 152 | + }) |
| 153 | + }) |
| 154 | + }) |
| 155 | +} |
| 156 | + |
| 157 | +// CallbackWaiter returns a callback and wait function that can be used multiple times. |
| 158 | +func CallbackWaiter() (callback func() error, waitFunc func(timeout time.Duration) error) { |
| 159 | + signal := make(chan struct{}, 1) |
| 160 | + callback = func() error { |
| 161 | + select { |
| 162 | + case signal <- struct{}{}: |
| 163 | + default: |
| 164 | + } |
| 165 | + return nil |
| 166 | + } |
| 167 | + waitFunc = func(timeout time.Duration) error { |
| 168 | + select { |
| 169 | + case <-signal: |
| 170 | + case <-time.After(timeout): |
| 171 | + return errors.New("timeout waiting for callback") |
| 172 | + } |
| 173 | + return nil |
| 174 | + } |
| 175 | + return |
| 176 | +} |
| 177 | + |
| 178 | +func TestProviderWatchTargetsTestSuite(t *testing.T) { |
| 179 | + suite.Run(t, new(ProviderWatchTargetsTestSuite)) |
| 180 | +} |
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