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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
//go:generate pluginator
package main
import (
"fmt"
"sigs.k8s.io/kustomize/api/filters/replicacount"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/kustomize/api/types"
"sigs.k8s.io/kustomize/kyaml/resid"
"sigs.k8s.io/yaml"
)
// Find matching replicas declarations and replace the count.
// Eases the kustomization configuration of replica changes.
type plugin struct {
Replica types.Replica `json:"replica,omitempty" yaml:"replica,omitempty"`
FieldSpecs []types.FieldSpec `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
}
var KustomizePlugin plugin //nolint:gochecknoglobals
func (p *plugin) Config(
_ *resmap.PluginHelpers, c []byte) (err error) {
p.Replica = types.Replica{}
p.FieldSpecs = nil
return yaml.Unmarshal(c, p)
}
func (p *plugin) Transform(m resmap.ResMap) error {
found := false
for _, fs := range p.FieldSpecs {
matcher := p.createMatcher(fs)
resList := m.GetMatchingResourcesByAnyId(matcher)
if len(resList) > 0 {
found = true
for _, r := range resList {
// There are redundant checks in the filter
// that we'll live with until resolution of
// https://github.com/kubernetes-sigs/kustomize/issues/2506
err := r.ApplyFilter(replicacount.Filter{
Replica: p.Replica,
FieldSpec: fs,
})
if err != nil {
return err
}
}
}
}
if !found {
gvks := make([]string, len(p.FieldSpecs))
for i, replicaSpec := range p.FieldSpecs {
gvks[i] = replicaSpec.Gvk.String()
}
return fmt.Errorf("resource with name %s does not match a config with the following GVK %v",
p.Replica.Name, gvks)
}
return nil
}
// Match Replica.Name and FieldSpec
func (p *plugin) createMatcher(fs types.FieldSpec) resmap.IdMatcher {
return func(r resid.ResId) bool {
return r.Name == p.Replica.Name && r.Gvk.IsSelected(&fs.Gvk)
}
}
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