// DeployWithAcceptor scales down from and then scales up to. If
// updateAcceptor is provided and the desired replica count is >1, the first
// replica of to is rolled out and validated before performing the full scale
// up.
//
// This is currently only used in conjunction with the rolling update strategy
// for initial deployments.
func (s *RecreateDeploymentStrategy) DeployWithAcceptor(from *kapi.ReplicationController, to *kapi.ReplicationController, desiredReplicas int, updateAcceptor strat.UpdateAcceptor) error {
	config, err := deployutil.DecodeDeploymentConfig(to, s.codec)
	if err != nil {
		return fmt.Errorf("couldn't decode config from deployment %s: %v", to.Name, err)
	}

	params := config.Spec.Strategy.RecreateParams
	retryParams := kubectl.NewRetryParams(s.retryPeriod, s.retryTimeout)
	waitParams := kubectl.NewRetryParams(s.retryPeriod, s.retryTimeout)

	// Execute any pre-hook.
	if params != nil && params.Pre != nil {
		if err := s.hookExecutor.Execute(params.Pre, to, "prehook"); err != nil {
			return fmt.Errorf("Pre hook failed: %s", err)
		} else {
			glog.Infof("Pre hook finished")
		}
	}

	// Scale down the from deployment.
	if from != nil {
		glog.Infof("Scaling %s down to zero", deployutil.LabelForDeployment(from))
		_, err := s.scaleAndWait(from, 0, retryParams, waitParams)
		if err != nil {
			return fmt.Errorf("couldn't scale %s to 0: %v", deployutil.LabelForDeployment(from), err)
		}
	}

	// Scale up the to deployment.
	if desiredReplicas > 0 {
		// If an UpdateAcceptor is provided, scale up to 1 and validate the replica,
		// aborting if the replica isn't acceptable.
		if updateAcceptor != nil {
			glog.Infof("Scaling %s to 1 before performing acceptance check", deployutil.LabelForDeployment(to))
			updatedTo, err := s.scaleAndWait(to, 1, retryParams, waitParams)
			if err != nil {
				return fmt.Errorf("couldn't scale %s to 1: %v", deployutil.LabelForDeployment(to), err)
			}
			glog.Infof("Performing acceptance check of %s", deployutil.LabelForDeployment(to))
			if err := updateAcceptor.Accept(updatedTo); err != nil {
				return fmt.Errorf("update acceptor rejected %s: %v", deployutil.LabelForDeployment(to), err)
			}
			to = updatedTo
		}
		// Complete the scale up.
		if to.Spec.Replicas != desiredReplicas {
			glog.Infof("Scaling %s to %d", deployutil.LabelForDeployment(to), desiredReplicas)
			updatedTo, err := s.scaleAndWait(to, desiredReplicas, retryParams, waitParams)
			if err != nil {
				return fmt.Errorf("couldn't scale %s to %d: %v", deployutil.LabelForDeployment(to), desiredReplicas, err)
			}
			to = updatedTo
		}
	}

	// Execute any post-hook. Errors are logged and ignored.
	if params != nil && params.Post != nil {
		if err := s.hookExecutor.Execute(params.Post, to, "posthook"); err != nil {
			util.HandleError(fmt.Errorf("post hook failed: %s", err))
		} else {
			glog.Infof("Post hook finished")
		}
	}

	glog.Infof("Deployment %s successfully made active", to.Name)
	return nil
}

// DeployWithAcceptor scales down from and then scales up to. If
// updateAcceptor is provided and the desired replica count is >1, the first
// replica of to is rolled out and validated before performing the full scale
// up.
//
// This is currently only used in conjunction with the rolling update strategy
// for initial deployments.
func (s *RecreateDeploymentStrategy) DeployWithAcceptor(from *kapi.ReplicationController, to *kapi.ReplicationController, desiredReplicas int, updateAcceptor strat.UpdateAcceptor) error {
	config, err := deployutil.DecodeDeploymentConfig(to, s.decoder)
	if err != nil {
		return fmt.Errorf("couldn't decode config from deployment %s: %v", to.Name, err)
	}

	params := config.Spec.Strategy.RecreateParams
	retryParams := kubectl.NewRetryParams(s.retryPeriod, s.retryTimeout)
	waitParams := kubectl.NewRetryParams(s.retryPeriod, s.retryTimeout)

	if updateAcceptor == nil {
		updateAcceptor = s.getUpdateAcceptor(time.Duration(*params.TimeoutSeconds)*time.Second, config.Spec.MinReadySeconds)
	}

	// Execute any pre-hook.
	if params != nil && params.Pre != nil {
		if err := s.hookExecutor.Execute(params.Pre, to, deployapi.PreHookPodSuffix, "pre"); err != nil {
			return fmt.Errorf("pre hook failed: %s", err)
		}
	}

	if s.until == "pre" {
		return strat.NewConditionReachedErr("pre hook succeeded")
	}

	// Record all warnings
	defer stratutil.RecordConfigWarnings(s.eventClient, from, s.decoder, s.out)
	defer stratutil.RecordConfigWarnings(s.eventClient, to, s.decoder, s.out)

	// Scale down the from deployment.
	if from != nil {
		fmt.Fprintf(s.out, "--> Scaling %s down to zero\n", from.Name)
		_, err := s.scaleAndWait(from, 0, retryParams, waitParams)
		if err != nil {
			return fmt.Errorf("couldn't scale %s to 0: %v", from.Name, err)
		}
	}

	if s.until == "0%" {
		return strat.NewConditionReachedErr("Reached 0% (no running pods)")
	}

	if params != nil && params.Mid != nil {
		if err := s.hookExecutor.Execute(params.Mid, to, deployapi.MidHookPodSuffix, "mid"); err != nil {
			return fmt.Errorf("mid hook failed: %s", err)
		}
	}

	if s.until == "mid" {
		return strat.NewConditionReachedErr("mid hook succeeded")
	}

	accepted := false

	// Scale up the to deployment.
	if desiredReplicas > 0 {
		if from != nil {
			// Scale up to 1 and validate the replica,
			// aborting if the replica isn't acceptable.
			fmt.Fprintf(s.out, "--> Scaling %s to 1 before performing acceptance check\n", to.Name)
			updatedTo, err := s.scaleAndWait(to, 1, retryParams, waitParams)
			if err != nil {
				return fmt.Errorf("couldn't scale %s to 1: %v", to.Name, err)
			}
			if err := updateAcceptor.Accept(updatedTo); err != nil {
				return fmt.Errorf("update acceptor rejected %s: %v", to.Name, err)
			}
			accepted = true
			to = updatedTo

			if strat.PercentageBetween(s.until, 1, 99) {
				return strat.NewConditionReachedErr(fmt.Sprintf("Reached %s", s.until))
			}
		}

		// Complete the scale up.
		if to.Spec.Replicas != int32(desiredReplicas) {
			fmt.Fprintf(s.out, "--> Scaling %s to %d\n", to.Name, desiredReplicas)
			updatedTo, err := s.scaleAndWait(to, desiredReplicas, retryParams, waitParams)
			if err != nil {
				return fmt.Errorf("couldn't scale %s to %d: %v", to.Name, desiredReplicas, err)
			}

			to = updatedTo
		}

		if !accepted {
			if err := updateAcceptor.Accept(to); err != nil {
				return fmt.Errorf("update acceptor rejected %s: %v", to.Name, err)
			}
		}
	}

//.........这里部分代码省略.........