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/
merge.go
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/
merge.go
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package generators
import (
"encoding/json"
"errors"
"fmt"
"time"
argoprojiov1alpha1 "github.com/argoproj/applicationset/api/v1alpha1"
"github.com/argoproj/applicationset/pkg/utils"
)
var _ Generator = (*MergeGenerator)(nil)
var (
ErrLessThanTwoGeneratorsInMerge = errors.New("found less than two generators, Merge requires two or more")
ErrNoMergeKeys = errors.New("no merge keys were specified, Merge requires at least one")
ErrNonUniqueParamSets = errors.New("the parameters from a generator were not unique by the given mergeKeys, Merge requires all param sets to be unique")
)
type MergeGenerator struct {
// The inner generators supported by the merge generator (cluster, git, list...)
supportedGenerators map[string]Generator
}
// NewMergeGenerator returns a MergeGenerator which allows the given supportedGenerators as child generators.
func NewMergeGenerator(supportedGenerators map[string]Generator) Generator {
m := &MergeGenerator{
supportedGenerators: supportedGenerators,
}
return m
}
// getParamSetsForAllGenerators generates params for each child generator in a MergeGenerator. Param sets are returned
// in slices ordered according to the order of the given generators.
func (m *MergeGenerator) getParamSetsForAllGenerators(generators []argoprojiov1alpha1.ApplicationSetNestedGenerator, appSet *argoprojiov1alpha1.ApplicationSet) ([][]map[string]string, error) {
var paramSets [][]map[string]string
for _, generator := range generators {
generatorParamSets, err := m.getParams(generator, appSet)
if err != nil {
return nil, err
}
// concatenate param lists produced by each generator
paramSets = append(paramSets, generatorParamSets)
}
return paramSets, nil
}
// GenerateParams gets the params produced by the MergeGenerator.
func (m *MergeGenerator) GenerateParams(appSetGenerator *argoprojiov1alpha1.ApplicationSetGenerator, appSet *argoprojiov1alpha1.ApplicationSet) ([]map[string]string, error) {
if appSetGenerator.Merge == nil {
return nil, EmptyAppSetGeneratorError
}
if len(appSetGenerator.Merge.Generators) < 2 {
return nil, ErrLessThanTwoGeneratorsInMerge
}
paramSetsFromGenerators, err := m.getParamSetsForAllGenerators(appSetGenerator.Merge.Generators, appSet)
if err != nil {
return nil, err
}
baseParamSetsByMergeKey, err := getParamSetsByMergeKey(appSetGenerator.Merge.MergeKeys, paramSetsFromGenerators[0])
if err != nil {
return nil, err
}
for _, paramSets := range paramSetsFromGenerators[1:] {
paramSetsByMergeKey, err := getParamSetsByMergeKey(appSetGenerator.Merge.MergeKeys, paramSets)
if err != nil {
return nil, err
}
for mergeKeyValue, baseParamSet := range baseParamSetsByMergeKey {
if overrideParamSet, exists := paramSetsByMergeKey[mergeKeyValue]; exists {
overriddenParamSet, err := utils.CombineStringMapsAllowDuplicates(baseParamSet, overrideParamSet)
if err != nil {
return nil, err
}
baseParamSetsByMergeKey[mergeKeyValue] = overriddenParamSet
}
}
}
mergedParamSets := make([]map[string]string, len(baseParamSetsByMergeKey))
var i = 0
for _, mergedParamSet := range baseParamSetsByMergeKey {
mergedParamSets[i] = mergedParamSet
i += 1
}
return mergedParamSets, nil
}
// getParamSetsByMergeKey converts the given list of parameter sets to a map of parameter sets where the key is the
// unique key of the parameter set as determined by the given mergeKeys. If any two parameter sets share the same merge
// key, getParamSetsByMergeKey will throw NonUniqueParamSets.
func getParamSetsByMergeKey(mergeKeys []string, paramSets []map[string]string) (map[string]map[string]string, error) {
if len(mergeKeys) < 1 {
return nil, ErrNoMergeKeys
}
deDuplicatedMergeKeys := make(map[string]bool, len(mergeKeys))
for _, mergeKey := range mergeKeys {
deDuplicatedMergeKeys[mergeKey] = false
}
paramSetsByMergeKey := make(map[string]map[string]string, len(paramSets))
for _, paramSet := range paramSets {
paramSetKey := make(map[string]string)
for mergeKey := range deDuplicatedMergeKeys {
paramSetKey[mergeKey] = paramSet[mergeKey]
}
paramSetKeyJson, err := json.Marshal(paramSetKey)
if err != nil {
return nil, err
}
paramSetKeyString := string(paramSetKeyJson)
if _, exists := paramSetsByMergeKey[paramSetKeyString]; exists {
return nil, fmt.Errorf("%w. Duplicate key was %s", ErrNonUniqueParamSets, paramSetKeyString)
}
paramSetsByMergeKey[paramSetKeyString] = paramSet
}
return paramSetsByMergeKey, nil
}
// getParams get the parameters generated by this generator.
func (m *MergeGenerator) getParams(appSetBaseGenerator argoprojiov1alpha1.ApplicationSetNestedGenerator, appSet *argoprojiov1alpha1.ApplicationSet) ([]map[string]string, error) {
var matrix *argoprojiov1alpha1.MatrixGenerator
if appSetBaseGenerator.Matrix != nil {
nestedMatrix, err := argoprojiov1alpha1.ToNestedMatrixGenerator(appSetBaseGenerator.Matrix)
if err != nil {
return nil, err
}
if nestedMatrix != nil {
matrix = nestedMatrix.ToMatrixGenerator()
}
}
var mergeGenerator *argoprojiov1alpha1.MergeGenerator
if appSetBaseGenerator.Merge != nil {
nestedMerge, err := argoprojiov1alpha1.ToNestedMergeGenerator(appSetBaseGenerator.Merge)
if err != nil {
return nil, err
}
if nestedMerge != nil {
mergeGenerator = nestedMerge.ToMergeGenerator()
}
}
t, err := Transform(
argoprojiov1alpha1.ApplicationSetGenerator{
List: appSetBaseGenerator.List,
Clusters: appSetBaseGenerator.Clusters,
Git: appSetBaseGenerator.Git,
SCMProvider: appSetBaseGenerator.SCMProvider,
ClusterDecisionResource: appSetBaseGenerator.ClusterDecisionResource,
PullRequest: appSetBaseGenerator.PullRequest,
Matrix: matrix,
Merge: mergeGenerator,
},
m.supportedGenerators,
argoprojiov1alpha1.ApplicationSetTemplate{},
appSet)
if err != nil {
return nil, fmt.Errorf("child generator returned an error on parameter generation: %v", err)
}
if len(t) == 0 {
return nil, fmt.Errorf("child generator generated no parameters")
}
if len(t) > 1 {
return nil, ErrMoreThenOneInnerGenerators
}
return t[0].Params, nil
}
func (m *MergeGenerator) GetRequeueAfter(appSetGenerator *argoprojiov1alpha1.ApplicationSetGenerator) time.Duration {
res := maxDuration
var found bool
for _, r := range appSetGenerator.Merge.Generators {
base := &argoprojiov1alpha1.ApplicationSetGenerator{
List: r.List,
Clusters: r.Clusters,
Git: r.Git,
}
generators := GetRelevantGenerators(base, m.supportedGenerators)
for _, g := range generators {
temp := g.GetRequeueAfter(base)
if temp < res && temp != NoRequeueAfter {
found = true
res = temp
}
}
}
if found {
return res
} else {
return NoRequeueAfter
}
}
// GetTemplate gets the Template field for the MergeGenerator.
func (m *MergeGenerator) GetTemplate(appSetGenerator *argoprojiov1alpha1.ApplicationSetGenerator) *argoprojiov1alpha1.ApplicationSetTemplate {
return &appSetGenerator.Merge.Template
}