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value_extractor.go
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/
value_extractor.go
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// Copyright 2018 The ksonnet 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 schema
import (
"strings"
rice "github.com/GeertJohan/go.rice"
"github.com/ksonnet/ksonnet-lib/ksonnet-gen/astext"
"github.com/ksonnet/ksonnet/pkg/node"
jsonnetutil "github.com/ksonnet/ksonnet/pkg/util/jsonnet"
"github.com/pkg/errors"
)
//go:generate rice embed-go
var valueExtractor *ValueExtractor
// ValueExtractorFactory returns a value extractor.
func ValueExtractorFactory() (*ValueExtractor, error) {
if valueExtractor != nil {
return valueExtractor, nil
}
assetsBox, err := rice.FindBox("assets")
if err != nil {
return nil, err
}
source, err := assetsBox.String("k8s.libsonnet")
if err != nil {
return nil, err
}
obj, err := jsonnetutil.Parse("k8s.libsonnet", source)
if err != nil {
return nil, err
}
valueExtractor = NewValueExtractor(obj)
return valueExtractor, nil
}
// Values are values extracted from a manifest.
type Values struct {
Lookup []string
Setter string
Value interface{}
}
// ValueExtractor extracts Values from a manifest.
type ValueExtractor struct {
object *node.Node
}
// NewValueExtractor creates an instance of ValueExtractor.
func NewValueExtractor(root *astext.Object) *ValueExtractor {
return &ValueExtractor{
object: node.New("root", root),
}
}
// Extract extracts values from an object.
func (ve *ValueExtractor) Extract(gvk GVK, props Properties) (map[string]Values, error) {
m := make(map[string]Values)
cache := make(map[string]bool)
paths := props.Paths(gvk)
for _, path := range paths {
item, err := ve.object.Search(path.Path...)
if err != nil {
continue
}
var manifestPath []string
var found bool
for _, p := range item.Path {
if p == gvk.Kind {
found = true
continue
}
if !found {
continue
}
manifestPath = append(manifestPath, p)
}
cachedPath := strings.Join(manifestPath, ".")
if _, ok := cache[cachedPath]; ok {
continue
}
cache[cachedPath] = true
v, err := props.Value(manifestPath)
if err != nil {
return nil, errors.Wrapf(err, "retrieve values for %s", strings.Join(manifestPath, "."))
}
lookupPath := manifestPath
if manifestPath[0] == "mixin" {
lookupPath = manifestPath[1:]
}
p := strings.Join(item.Path, ".")
dv := Values{
Lookup: lookupPath,
Setter: item.Name,
Value: v,
}
m[p] = dv
}
return m, nil
}