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// Copyright 2022 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package filtersutil
import (
"sigs.k8s.io/kustomize/kyaml/yaml"
)
// SetFn is a function that accepts an RNode to possibly modify.
type SetFn func(*yaml.RNode) error
// SetScalar returns a SetFn to set a scalar value
func SetScalar(value string) SetFn {
return SetEntry("", value, yaml.NodeTagEmpty)
}
// SetEntry returns a SetFn to set a field or a map entry to a value.
// It can be used with an empty name to set both a value and a tag on a scalar node.
// When setting only a value on a scalar node, use SetScalar instead.
func SetEntry(name, value, tag string) SetFn {
n := &yaml.Node{
Kind: yaml.ScalarNode,
Value: value,
Tag: tag,
}
return func(node *yaml.RNode) error {
return node.PipeE(yaml.FieldSetter{
Name: name,
Value: yaml.NewRNode(n),
})
}
}
type TrackableSetter struct {
// SetValueCallback will be invoked each time a field is set
setValueCallback func(name, value, tag string, node *yaml.RNode)
}
// WithMutationTracker registers a callback which will be invoked each time a field is mutated
func (s *TrackableSetter) WithMutationTracker(callback func(key, value, tag string, node *yaml.RNode)) *TrackableSetter {
s.setValueCallback = callback
return s
}
// SetScalar returns a SetFn to set a scalar value.
// if a mutation tracker has been registered, the tracker will be invoked each
// time a scalar is set
func (s TrackableSetter) SetScalar(value string) SetFn {
return s.SetEntry("", value, yaml.NodeTagEmpty)
}
// SetScalarIfEmpty returns a SetFn to set a scalar value only if it isn't already set.
// If a mutation tracker has been registered, the tracker will be invoked each
// time a scalar is actually set.
func (s TrackableSetter) SetScalarIfEmpty(value string) SetFn {
return s.SetEntryIfEmpty("", value, yaml.NodeTagEmpty)
}
// SetEntry returns a SetFn to set a field or a map entry to a value.
// It can be used with an empty name to set both a value and a tag on a scalar node.
// When setting only a value on a scalar node, use SetScalar instead.
// If a mutation tracker has been registered, the tracker will be invoked each
// time an entry is set.
func (s TrackableSetter) SetEntry(name, value, tag string) SetFn {
origSetEntry := SetEntry(name, value, tag)
return func(node *yaml.RNode) error {
if s.setValueCallback != nil {
s.setValueCallback(name, value, tag, node)
}
return origSetEntry(node)
}
}
// SetEntryIfEmpty returns a SetFn to set a field or a map entry to a value only if it isn't already set.
// It can be used with an empty name to set both a value and a tag on a scalar node.
// When setting only a value on a scalar node, use SetScalar instead.
// If a mutation tracker has been registered, the tracker will be invoked each
// time an entry is actually set.
func (s TrackableSetter) SetEntryIfEmpty(key, value, tag string) SetFn {
origSetEntry := SetEntry(key, value, tag)
return func(node *yaml.RNode) error {
if hasExistingValue(node, key) {
return nil
}
if s.setValueCallback != nil {
s.setValueCallback(key, value, tag, node)
}
return origSetEntry(node)
}
}
func hasExistingValue(node *yaml.RNode, key string) bool {
if node.IsNilOrEmpty() {
return false
}
if err := yaml.ErrorIfInvalid(node, yaml.ScalarNode); err == nil {
return yaml.GetValue(node) != ""
}
entry := node.Field(key)
if entry.IsNilOrEmpty() {
return false
}
return yaml.GetValue(entry.Value) != ""
}
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