kubernetes map_element 源码
kubernetes map_element 代码
文件路径：/staging/src/k8s.io/kubectl/pkg/apply/parse/map_element.go
/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package parse
import (
"k8s.io/kube-openapi/pkg/util/proto"
"k8s.io/kubectl/pkg/apply"
)
// mapElement builds a new mapElement from a mapItem
func (v ElementBuildingVisitor) mapElement(meta apply.FieldMetaImpl, item *mapItem) (*apply.MapElement, error) {
// Function to return schema type of the map values
var fn schemaFn = func(string) proto.Schema {
// All map values share the same schema
if item.Map != nil && item.Map.SubType != nil {
return item.Map.SubType
}
return nil
}
// Collect same fields from multiple maps into a map of elements
values, err := v.createMapValues(fn, meta, item.MapElementData)
if err != nil {
return nil, err
}
// Return the result
return &apply.MapElement{
FieldMetaImpl: meta,
MapElementData: item.MapElementData,
Values: values,
}, nil
}
// schemaFn returns the schema for a field or map value based on its name or key
type schemaFn func(key string) proto.Schema
// createMapValues combines the recorded, local and remote values from
// data into a map of elements.
func (v ElementBuildingVisitor) createMapValues(
schemaFn schemaFn,
meta apply.FieldMetaImpl,
data apply.MapElementData) (map[string]apply.Element, error) {
// Collate each key in the map
values := map[string]apply.Element{}
for _, key := range keysUnion(data.GetRecordedMap(), data.GetLocalMap(), data.GetRemoteMap()) {
combined := apply.RawElementData{}
if recorded, recordedSet := nilSafeLookup(key, data.GetRecordedMap()); recordedSet {
combined.SetRecorded(recorded)
}
if local, localSet := nilSafeLookup(key, data.GetLocalMap()); localSet {
combined.SetLocal(local)
}
if remote, remoteSet := nilSafeLookup(key, data.GetRemoteMap()); remoteSet {
combined.SetRemote(remote)
}
// Create an item for the field
field, err := v.getItem(schemaFn(key), key, combined)
if err != nil {
return nil, err
}
// Build the element for this field
element, err := field.CreateElement(v)
if err != nil {
return nil, err
}
// Add the field element to the map
values[key] = element
}
return values, nil
}
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