mirror of https://github.com/linkerd/linkerd2.git
140 lines
3.8 KiB
Go
140 lines
3.8 KiB
Go
package cmd
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import (
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"fmt"
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"os"
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"os/signal"
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"time"
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"github.com/linkerd/linkerd2/pkg/k8s"
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"github.com/pkg/browser"
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"github.com/spf13/cobra"
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)
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// These constants are used by the `show` flag.
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const (
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// showLinkerd opens the Linkerd dashboard in a web browser (default).
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showLinkerd = "linkerd"
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// showGrafana opens the Grafana dashboard in a web browser.
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showGrafana = "grafana"
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// showURL displays dashboard URLs without opening a browser.
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showURL = "url"
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// webDeployment is the name of the web deployment in cli/install/template.go
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webDeployment = "linkerd-web"
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// webPort is the http port from the web pod spec in cli/install/template.go
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webPort = 8084
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)
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type dashboardOptions struct {
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port int
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show string
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wait time.Duration
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}
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func newDashboardOptions() *dashboardOptions {
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return &dashboardOptions{
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port: 0,
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show: showLinkerd,
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wait: 300 * time.Second,
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}
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}
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func newCmdDashboard() *cobra.Command {
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options := newDashboardOptions()
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cmd := &cobra.Command{
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Use: "dashboard [flags]",
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Short: "Open the Linkerd dashboard in a web browser",
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RunE: func(cmd *cobra.Command, args []string) error {
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if options.port < 0 {
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return fmt.Errorf("port must be greater than or equal to zero, was %d", options.port)
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}
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if options.show != showLinkerd && options.show != showGrafana && options.show != showURL {
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return fmt.Errorf("unknown value for 'show' param, was: %s, must be one of: %s, %s, %s",
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options.show, showLinkerd, showGrafana, showURL)
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}
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// ensure we can connect to the public API before starting the proxy
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validatedPublicAPIClient(time.Now().Add(options.wait), true)
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wait := make(chan struct{}, 1)
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signals := make(chan os.Signal, 1)
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signal.Notify(signals, os.Interrupt)
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defer signal.Stop(signals)
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portforward, err := k8s.NewPortForward(
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kubeconfigPath,
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kubeContext,
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controlPlaneNamespace,
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webDeployment,
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options.port,
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webPort,
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verbose,
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)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to initialize port-forward: %s\n", err)
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os.Exit(1)
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}
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go func() {
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err := portforward.Run()
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if err != nil {
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fmt.Fprintf(os.Stderr, "Error running port-forward: %s", err)
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os.Exit(1)
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}
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close(wait)
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}()
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go func() {
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<-signals
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portforward.Stop()
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}()
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<-portforward.Ready()
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webURL := portforward.URLFor("")
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grafanaURL := portforward.URLFor("/grafana")
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fmt.Printf("Linkerd dashboard available at:\n%s\n", webURL)
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fmt.Printf("Grafana dashboard available at:\n%s\n", grafanaURL)
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switch options.show {
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case showLinkerd:
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fmt.Println("Opening Linkerd dashboard in the default browser")
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err = browser.OpenURL(webURL)
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if err != nil {
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fmt.Fprintln(os.Stderr, "Failed to open Linkerd dashboard automatically")
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fmt.Fprintf(os.Stderr, "Visit %s in your browser to view the dashboard\n", webURL)
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}
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case showGrafana:
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fmt.Println("Opening Grafana dashboard in the default browser")
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err = browser.OpenURL(grafanaURL)
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if err != nil {
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fmt.Fprintln(os.Stderr, "Failed to open Grafana dashboard automatically")
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fmt.Fprintf(os.Stderr, "Visit %s in your browser to view the dashboard\n", grafanaURL)
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}
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case showURL:
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// no-op, we already printed the URLs
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}
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<-wait
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return nil
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},
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}
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cmd.Args = cobra.NoArgs
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// This is identical to what `kubectl proxy --help` reports, `--port 0` indicates a random port.
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cmd.PersistentFlags().IntVarP(&options.port, "port", "p", options.port, "The local port on which to serve requests (when set to 0, a random port will be used)")
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cmd.PersistentFlags().StringVar(&options.show, "show", options.show, "Open a dashboard in a browser or show URLs in the CLI (one of: linkerd, grafana, url)")
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cmd.PersistentFlags().DurationVar(&options.wait, "wait", options.wait, "Wait for dashboard to become available if it's not available when the command is run")
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return cmd
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}
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