github.com/GoogleContainerTools/skaffold@v1.39.18/pkg/skaffold/schema/util/upgrade_pipelines.go (about)

     1  /*
     2  Copyright 2019 The Skaffold Authors
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package util
    18  
    19  import (
    20  	"errors"
    21  	"fmt"
    22  	"reflect"
    23  )
    24  
    25  type pipelineUpgrader struct {
    26  	oldConfig reflect.Value
    27  	newConfig reflect.Value
    28  	upgrade   func(o, n interface{}) error
    29  }
    30  
    31  func UpgradePipelines(oldConfig, newConfig interface{}, upgrade func(o, n interface{}) error) (err error) {
    32  	defer func() {
    33  		if r := recover(); r != nil {
    34  			switch x := r.(type) {
    35  			case string:
    36  				err = fmt.Errorf("upgrading pipelines failed: %s", x)
    37  			case error:
    38  				err = x
    39  			default:
    40  				err = errors.New("unknown panic")
    41  			}
    42  		}
    43  	}()
    44  
    45  	upgrader := pipelineUpgrader{
    46  		oldConfig: reflect.Indirect(reflect.ValueOf(oldConfig)),
    47  		newConfig: reflect.Indirect(reflect.ValueOf(newConfig)),
    48  		upgrade:   upgrade,
    49  	}
    50  
    51  	if err := upgrader.mainPipeline(); err != nil {
    52  		return err
    53  	}
    54  
    55  	return upgrader.profiles()
    56  }
    57  
    58  func (u *pipelineUpgrader) mainPipeline() error {
    59  	const fieldMainPipeline = "Pipeline"
    60  
    61  	oldPipeline := u.oldConfig.FieldByName(fieldMainPipeline).Addr().Interface()
    62  	newPipeline := u.newConfig.FieldByName(fieldMainPipeline).Addr().Interface()
    63  
    64  	err := u.upgrade(oldPipeline, newPipeline)
    65  	if err != nil {
    66  		return fmt.Errorf("upgrading main pipeline: %w", err)
    67  	}
    68  
    69  	return nil
    70  }
    71  
    72  func (u *pipelineUpgrader) profiles() error {
    73  	const (
    74  		fieldProfilePipeline = "Pipeline"
    75  		fieldProfiles        = "Profiles"
    76  	)
    77  
    78  	profilesOld := u.oldConfig.FieldByName(fieldProfiles)
    79  	profilesNew := u.newConfig.FieldByName(fieldProfiles)
    80  
    81  	if profilesOld.Len() != profilesNew.Len() {
    82  		return fmt.Errorf("lengths of old and new profiles differ")
    83  	}
    84  
    85  	for i := 0; i < profilesOld.Len(); i++ {
    86  		oldPipeline := profilesOld.Index(i).FieldByName(fieldProfilePipeline).Addr().Interface()
    87  		newPipeline := profilesNew.Index(i).FieldByName(fieldProfilePipeline).Addr().Interface()
    88  
    89  		if err := u.upgrade(oldPipeline, newPipeline); err != nil {
    90  			return fmt.Errorf("upgrading pipeline of profile %d: %w", i+1, err)
    91  		}
    92  	}
    93  
    94  	return nil
    95  }