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TRA-3234 Fetch command (#54)
* preparation to fetch command * get har as zip from server * no message * no message
This commit is contained in:
gadotroee
GitHub
189
cli/cmd/tapRunner.go
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189
cli/cmd/tapRunner.go
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@@ -0,0 +1,189 @@
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package cmd
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import (
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"context"
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"fmt"
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"github.com/up9inc/mizu/cli/kubernetes"
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"github.com/up9inc/mizu/cli/mizu"
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"os"
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"os/signal"
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"regexp"
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"syscall"
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"time"
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)
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func RunMizuTap(podRegexQuery *regexp.Regexp, tappingOptions *MizuTapOptions) {
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kubernetesProvider := kubernetes.NewProvider(tappingOptions.KubeConfigPath, tappingOptions.Namespace)
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel() // cancel will be called when this function exits
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nodeToTappedPodIPMap, err := getNodeHostToTappedPodIpsMap(ctx, kubernetesProvider, podRegexQuery)
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if err != nil {
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cleanUpMizuResources(kubernetesProvider)
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return
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}
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err = createMizuResources(ctx, kubernetesProvider, nodeToTappedPodIPMap, tappingOptions)
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if err != nil {
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cleanUpMizuResources(kubernetesProvider)
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return
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}
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go portForwardApiPod(ctx, kubernetesProvider, cancel, tappingOptions) //TODO convert this to job for built in pod ttl or have the running app handle this
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waitForFinish(ctx, cancel) //block until exit signal or error
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// TODO handle incoming traffic from tapper using a channel
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//cleanup
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fmt.Printf("\nRemoving mizu resources\n")
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cleanUpMizuResources(kubernetesProvider)
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}
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func createMizuResources(ctx context.Context, kubernetesProvider *kubernetes.Provider, nodeToTappedPodIPMap map[string][]string, tappingOptions *MizuTapOptions) error {
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mizuServiceAccountExists := createRBACIfNecessary(ctx, kubernetesProvider)
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_, err := kubernetesProvider.CreateMizuAggregatorPod(ctx, mizu.ResourcesNamespace, mizu.AggregatorPodName, tappingOptions.MizuImage, mizuServiceAccountExists)
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if err != nil {
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fmt.Printf("Error creating mizu collector pod: %v\n", err)
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return err
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}
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aggregatorService, err := kubernetesProvider.CreateService(ctx, mizu.ResourcesNamespace, mizu.AggregatorPodName, mizu.AggregatorPodName)
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if err != nil {
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fmt.Printf("Error creating mizu collector service: %v\n", err)
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return err
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}
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err = kubernetesProvider.CreateMizuTapperDaemonSet(ctx, mizu.ResourcesNamespace, mizu.TapperDaemonSetName, tappingOptions.MizuImage, mizu.TapperPodName, fmt.Sprintf("%s.%s.svc.cluster.local", aggregatorService.Name, aggregatorService.Namespace), nodeToTappedPodIPMap, mizuServiceAccountExists)
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if err != nil {
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fmt.Printf("Error creating mizu tapper daemonset: %v\n", err)
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return err
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}
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return nil
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}
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func cleanUpMizuResources(kubernetesProvider *kubernetes.Provider) {
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removalCtx, _ := context.WithTimeout(context.Background(), 5 * time.Second)
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if err := kubernetesProvider.RemovePod(removalCtx, mizu.ResourcesNamespace, mizu.AggregatorPodName); err != nil {
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fmt.Printf("Error removing Pod %s in namespace %s: %s (%v,%+v)\n", mizu.AggregatorPodName, mizu.ResourcesNamespace, err, err, err);
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}
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if err := kubernetesProvider.RemoveService(removalCtx, mizu.ResourcesNamespace, mizu.AggregatorPodName); err != nil {
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fmt.Printf("Error removing Service %s in namespace %s: %s (%v,%+v)\n", mizu.AggregatorPodName, mizu.ResourcesNamespace, err, err, err);
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}
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if err := kubernetesProvider.RemoveDaemonSet(removalCtx, mizu.ResourcesNamespace, mizu.TapperDaemonSetName); err != nil {
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fmt.Printf("Error removing DaemonSet %s in namespace %s: %s (%v,%+v)\n", mizu.TapperDaemonSetName, mizu.ResourcesNamespace, err, err, err);
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}
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}
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// will be relevant in the future
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//func watchPodsForTapping(ctx context.Context, kubernetesProvider *kubernetes.Provider, cancel context.CancelFunc, podRegex *regexp.Regexp) {
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// added, modified, removed, errorChan := kubernetes.FilteredWatch(ctx, kubernetesProvider.GetPodWatcher(ctx, kubernetesProvider.Namespace), podRegex)
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// for {
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// select {
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// case newTarget := <- added:
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// fmt.Printf("+%s\n", newTarget.Name)
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//
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// case removedTarget := <- removed:
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// fmt.Printf("-%s\n", removedTarget.Name)
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//
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// case <- modified:
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// continue
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//
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// case <- errorChan:
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// cancel()
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//
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// case <- ctx.Done():
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// return
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// }
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// }
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//}
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func portForwardApiPod(ctx context.Context, kubernetesProvider *kubernetes.Provider, cancel context.CancelFunc, tappingOptions *MizuTapOptions) {
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podExactRegex := regexp.MustCompile(fmt.Sprintf("^%s$", mizu.AggregatorPodName))
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added, modified, removed, errorChan := kubernetes.FilteredWatch(ctx, kubernetesProvider.GetPodWatcher(ctx, mizu.ResourcesNamespace), podExactRegex)
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isPodReady := false
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var portForward *kubernetes.PortForward
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for {
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select {
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case <- added:
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continue
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case <- removed:
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fmt.Printf("%s removed\n", mizu.AggregatorPodName)
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cancel()
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return
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case modifiedPod := <- modified:
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if modifiedPod.Status.Phase == "Running" && !isPodReady {
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isPodReady = true
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var err error
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portForward, err = kubernetes.NewPortForward(kubernetesProvider, mizu.ResourcesNamespace, mizu.AggregatorPodName, tappingOptions.GuiPort, tappingOptions.MizuPodPort, cancel)
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fmt.Printf("Web interface is now available at http://localhost:%d\n", tappingOptions.GuiPort)
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if err != nil {
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fmt.Printf("error forwarding port to pod %s\n", err)
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cancel()
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}
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}
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case <- time.After(25 * time.Second):
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if !isPodReady {
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fmt.Printf("error: %s pod was not ready in time", mizu.AggregatorPodName)
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cancel()
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}
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case <- errorChan:
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cancel()
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case <- ctx.Done():
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if portForward != nil {
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portForward.Stop()
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}
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return
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}
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}
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}
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func createRBACIfNecessary(ctx context.Context, kubernetesProvider *kubernetes.Provider) bool {
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mizuRBACExists, err := kubernetesProvider.DoesMizuRBACExist(ctx, mizu.ResourcesNamespace)
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if err != nil {
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fmt.Printf("warning: could not ensure mizu rbac resources exist %v\n", err)
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return false
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}
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if !mizuRBACExists {
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var versionString = mizu.Version
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if mizu.GitCommitHash != "" {
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versionString += "-" + mizu.GitCommitHash
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}
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err := kubernetesProvider.CreateMizuRBAC(ctx, mizu.ResourcesNamespace, versionString)
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if err != nil {
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fmt.Printf("warning: could not create mizu rbac resources %v\n", err)
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return false
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}
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}
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return true
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}
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func getNodeHostToTappedPodIpsMap(ctx context.Context, kubernetesProvider *kubernetes.Provider, regex *regexp.Regexp) (map[string][]string, error) {
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matchingPods, err := kubernetesProvider.GetAllPodsMatchingRegex(ctx, regex)
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if err != nil {
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return nil, err
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}
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nodeToTappedPodIPMap := make(map[string][]string, 0)
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for _, pod := range matchingPods {
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existingList := nodeToTappedPodIPMap[pod.Spec.NodeName]
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if existingList == nil {
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nodeToTappedPodIPMap[pod.Spec.NodeName] = []string {pod.Status.PodIP}
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} else {
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nodeToTappedPodIPMap[pod.Spec.NodeName] = append(nodeToTappedPodIPMap[pod.Spec.NodeName], pod.Status.PodIP)
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}
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}
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return nodeToTappedPodIPMap, nil
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}
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func waitForFinish(ctx context.Context, cancel context.CancelFunc) {
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sigChan := make(chan os.Signal, 1)
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signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
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// block until ctx cancel is called or termination signal is received
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select {
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case <- ctx.Done():
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break
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case <- sigChan:
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cancel()
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}
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}
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