func StartInstance()

in integration_test/gce-testing-internal/gce/gce_testing.go [1864:1899]

30 lines of code
5 McCabe index (conditional complexity)


func StartInstance(ctx context.Context, logger *log.Logger, vm *VM) error {
	ctx, cancel := context.WithTimeout(ctx, 20*time.Minute)
	defer cancel()

	var output CommandOutput
	tryStart := func() error {
		var err error
		output, err = RunGcloud(ctx, logger, "",
			[]string{
				"compute", "instances", "start",
				"--project=" + vm.Project,
				"--zone=" + vm.Zone,
				vm.Name,
				"--format=json",
			})
		// Sometimes we see errors about running out of CPU quota or IP addresses,
		// Back off and retry in these cases, just like CreateInstance().
		if err != nil && !strings.Contains(err.Error(), "Quota") {
			err = backoff.Permanent(err)
		}
		// Returning a non-permanent error triggers retries.
		return err
	}
	backoffPolicy := backoff.WithContext(backoff.NewConstantBackOff(time.Minute), ctx)
	if err := backoff.Retry(tryStart, backoffPolicy); err != nil {
		return err
	}

	ipAddress, err := extractIPAddress(output.Stdout)
	if err != nil {
		return err
	}
	vm.IPAddress = ipAddress

	return waitForStart(ctx, logger, vm)
}