servicemappingloader.go

Documentation: github.com/GoogleCloudPlatform/k8s-config-connector/scripts/resource-autogen/servicemapping/servicemappingloader

     1  // Copyright 2022 Google LLC
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package servicemappingloader
    16  
    17  import (
    18  	"fmt"
    19  	"io"
    20  	"path"
    21  	"sort"
    22  	"strings"
    23  
    24  	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/apis/core/v1alpha1"
    25  	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/deepcopy"
    26  	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/k8s"
    27  	"github.com/GoogleCloudPlatform/k8s-config-connector/scripts/resource-autogen/allowlist"
    28  	generatedembed "github.com/GoogleCloudPlatform/k8s-config-connector/scripts/resource-autogen/servicemapping/embed/generated"
    29  
    30  	"github.com/ghodss/yaml"
    31  )
    32  
    33  var emptyIAMConfig v1alpha1.IAMConfig
    34  
    35  func GetServiceMappingMap() (map[string]v1alpha1.ServiceMapping, error) {
    36  	generatedSMMap, err := GetGeneratedSMMap()
    37  	if err != nil {
    38  		return nil, fmt.Errorf("error getting all the generated ServiceMapping map: %w", err)
    39  	}
    40  	return getAllowlistedSMMap(generatedSMMap)
    41  }
    42  
    43  func GetGeneratedSMMap() (map[string]v1alpha1.ServiceMapping, error) {
    44  	baseDirName := "/"
    45  	generatedSMDir, err := generatedembed.Assets.Open(baseDirName)
    46  	if err != nil {
    47  		return nil, fmt.Errorf("error reading generated files in ServiceMapping directory: %v", err)
    48  	}
    49  	defer generatedSMDir.Close()
    50  	generatedFiles, err := generatedSMDir.Readdir(0)
    51  	if err != nil {
    52  		return nil, fmt.Errorf("error reading generated files in ServiceMapping directory: %v", err)
    53  	}
    54  
    55  	serviceMappings := make(map[string]v1alpha1.ServiceMapping)
    56  	for _, file := range generatedFiles {
    57  		smPath := path.Join(baseDirName, file.Name())
    58  		sm, err := fileToServiceMapping(smPath)
    59  		if err != nil {
    60  			return nil, err
    61  		}
    62  		serviceMappings[sm.Name] = *sm
    63  	}
    64  	return serviceMappings, nil
    65  }
    66  
    67  func getAllowlistedSMMap(generatedSMMap map[string]v1alpha1.ServiceMapping) (map[string]v1alpha1.ServiceMapping, error) {
    68  	autoGenAllowlist, err := allowlist.LoadAutoGenAllowList(generatedSMMap)
    69  	if err != nil {
    70  		return nil, err
    71  	}
    72  
    73  	allowlistedSMMap := make(map[string]v1alpha1.ServiceMapping)
    74  	for _, sm := range generatedSMMap {
    75  		if !autoGenAllowlist.HasService(strings.ToLower(sm.Spec.Name)) {
    76  			continue
    77  		}
    78  
    79  		allowlistedSM := deepcopy.DeepCopy(sm).(v1alpha1.ServiceMapping)
    80  		rcList := []v1alpha1.ResourceConfig{}
    81  		for _, rc := range sm.Spec.Resources {
    82  			autoGenType, ok := autoGenAllowlist.GetTFTypeInService(strings.ToLower(sm.Spec.Name), rc.Name)
    83  			if !ok {
    84  				continue
    85  			}
    86  			// Override the version for the allowlisted resource.
    87  			rc.Version = &autoGenType.Version
    88  			allowlistedRC := deepcopy.DeepCopy(rc).(v1alpha1.ResourceConfig)
    89  			// Remove IAM config for v1alpha1 resources.
    90  			if autoGenType.Version == k8s.KCCAPIVersionV1Alpha1 {
    91  				allowlistedRC.IAMConfig = emptyIAMConfig
    92  			}
    93  			// Remove the resource references of the allowlisted resource if the
    94  			// referenced resource is a v1alpha1 resource.
    95  			var resourceReferences []v1alpha1.ReferenceConfig
    96  			for _, rr := range allowlistedRC.ResourceReferences {
    97  				autoGenType, ok := autoGenAllowlist.GetKRMKind(rr.GVK.Kind)
    98  				if ok && autoGenType.Version == k8s.KCCAPIVersionV1Alpha1 {
    99  					continue
   100  				}
   101  				resourceReferences = append(resourceReferences, rr)
   102  			}
   103  			allowlistedRC.ResourceReferences = resourceReferences
   104  			rcList = append(rcList, allowlistedRC)
   105  		}
   106  		sort.Slice(rcList, func(i, j int) bool {
   107  			return rcList[i].Name < rcList[j].Name
   108  		})
   109  		allowlistedSM.Spec.Resources = rcList
   110  		allowlistedSMMap[sm.Name] = allowlistedSM
   111  	}
   112  	return allowlistedSMMap, nil
   113  }
   114  
   115  func fileToServiceMapping(filePath string) (*v1alpha1.ServiceMapping, error) {
   116  	file, err := generatedembed.Assets.Open(filePath)
   117  
   118  	if err != nil {
   119  		return nil, fmt.Errorf("error opening file '%v': %v", filePath, err)
   120  	}
   121  	defer file.Close()
   122  
   123  	sm, err := readerToServiceMapping(file)
   124  	if err != nil {
   125  		return nil, fmt.Errorf("error reading file '%v' to service mapping: %v", filePath, err)
   126  	}
   127  	return sm, nil
   128  }
   129  
   130  func readerToServiceMapping(r io.Reader) (*v1alpha1.ServiceMapping, error) {
   131  	bytes, err := io.ReadAll(r)
   132  	if err != nil {
   133  		return nil, fmt.Errorf("error reading file: %v", err)
   134  	}
   135  	var sm v1alpha1.ServiceMapping
   136  	if err := yaml.Unmarshal(bytes, &sm); err != nil {
   137  		return nil, fmt.Errorf("error unmarshaling byte to service mapping: %v", err)
   138  	}
   139  	return &sm, nil
   140  }
   141
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