/
label_manager.go
91 lines (71 loc) · 2.17 KB
/
label_manager.go
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package builder
import (
"encoding/json"
"fmt"
"github.com/buildpacks/pack/pkg/dist"
"github.com/buildpacks/pack/internal/stack"
)
type LabelManager struct {
inspectable Inspectable
}
func NewLabelManager(inspectable Inspectable) *LabelManager {
return &LabelManager{inspectable: inspectable}
}
func (m *LabelManager) Metadata() (Metadata, error) {
var parsedMetadata Metadata
err := m.labelJSON(metadataLabel, &parsedMetadata)
return parsedMetadata, err
}
func (m *LabelManager) StackID() (string, error) {
return m.labelContent(stackLabel)
}
func (m *LabelManager) Mixins() ([]string, error) {
parsedMixins := []string{}
err := m.labelJSONDefaultEmpty(stack.MixinsLabel, &parsedMixins)
return parsedMixins, err
}
func (m *LabelManager) Order() (dist.Order, error) {
parsedOrder := dist.Order{}
err := m.labelJSONDefaultEmpty(OrderLabel, &parsedOrder)
return parsedOrder, err
}
func (m *LabelManager) BuildpackLayers() (dist.BuildpackLayers, error) {
parsedLayers := dist.BuildpackLayers{}
err := m.labelJSONDefaultEmpty(dist.BuildpackLayersLabel, &parsedLayers)
return parsedLayers, err
}
func (m *LabelManager) labelContent(labelName string) (string, error) {
content, err := m.inspectable.Label(labelName)
if err != nil {
return "", fmt.Errorf("getting label %s: %w", labelName, err)
}
if content == "" {
return "", fmt.Errorf("builder missing label %s -- try recreating builder", labelName)
}
return content, nil
}
func (m *LabelManager) labelJSON(labelName string, targetObject interface{}) error {
rawContent, err := m.labelContent(labelName)
if err != nil {
return err
}
err = json.Unmarshal([]byte(rawContent), targetObject)
if err != nil {
return fmt.Errorf("parsing label content for %s: %w", labelName, err)
}
return nil
}
func (m *LabelManager) labelJSONDefaultEmpty(labelName string, targetObject interface{}) error {
rawContent, err := m.inspectable.Label(labelName)
if err != nil {
return fmt.Errorf("getting label %s: %w", labelName, err)
}
if rawContent == "" {
return nil
}
err = json.Unmarshal([]byte(rawContent), targetObject)
if err != nil {
return fmt.Errorf("parsing label content for %s: %w", labelName, err)
}
return nil
}