Function runDaemonMetrics

cmd/tailscale/cli/debug.go:882–933

(ctx context.Context, args []string)

}

func runDaemonMetrics(ctx context.Context, args []string) error {
	last := map[string]int64{}
	for {
		out, err := localClient.DaemonMetrics(ctx)
		if err != nil {
			return err
		}
		if !metricsArgs.watch {
			Stdout.Write(out)
			return nil
		}
		bs := bufio.NewScanner(bytes.NewReader(out))
		type change struct {
			name     string
			from, to int64
		}
		var changes []change
		var maxNameLen int
		for bs.Scan() {
			line := bytes.TrimSpace(bs.Bytes())
			if len(line) == 0 || line[0] == '#' {
				continue
			}
			f := strings.Fields(string(line))
			if len(f) != 2 {
				continue
			}
			name := f[0]
			n, _ := strconv.ParseInt(f[1], 10, 64)
			prev, ok := last[name]
			if ok && prev == n {
				continue
			}
			last[name] = n
			if !ok {
				continue
			}
			changes = append(changes, change{name, prev, n})
			if len(name) > maxNameLen {
				maxNameLen = len(name)
			}
		}
		if len(changes) > 0 {
			format := fmt.Sprintf("%%-%ds %%+5d => %%v\n", maxNameLen)
			for _, c := range changes {
				fmt.Fprintf(Stdout, format, c.name, c.to-c.from, c.to)
			}
			io.WriteString(Stdout, "\n")
		}
		time.Sleep(time.Second)
	}
}

func runVia(ctx context.Context, args []string) error {
	switch len(args) {