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decoder.go
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decoder.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package decoder
import (
"bytes"
"errors"
"fmt"
"io"
"gopkg.in/yaml.v3"
"github.com/talos-systems/talos/pkg/machinery/config"
"github.com/talos-systems/talos/pkg/machinery/config/encoder"
)
var (
// ErrMissingVersion indicates that the manifest is missing a version.
ErrMissingVersion = errors.New("missing version")
// ErrMissingKind indicates that the manifest is missing a kind.
ErrMissingKind = errors.New("missing kind")
// ErrMissingSpec indicates that the manifest is missing a spec.
ErrMissingSpec = errors.New("missing spec")
// ErrMissingSpecConent indicates that the manifest spec is empty.
ErrMissingSpecConent = errors.New("missing spec content")
)
const (
// ManifestVersionKey is the string indicating a manifest's version.
ManifestVersionKey = "version"
// ManifestKindKey is the string indicating a manifest's kind.
ManifestKindKey = "kind"
// ManifestSpecKey is represents a manifest's spec.
ManifestSpecKey = "spec"
// ManifestDeprecatedKey is represents the deprected v1alpha1 manifest.
ManifestDeprecatedKey = "machine"
)
// Decoder represents a multi-doc YAML decoder.
type Decoder struct {
source []byte
}
// Decode decodes all known manifests.
func (d *Decoder) Decode() ([]interface{}, error) {
return d.decode()
}
// NewDecoder initializes and returns a `Decoder`.
func NewDecoder(source []byte) *Decoder {
return &Decoder{
source: source,
}
}
func (d *Decoder) decode() ([]interface{}, error) {
return parse(d.source)
}
func parse(source []byte) (decoded []interface{}, err error) {
decoded = []interface{}{}
r := bytes.NewReader(source)
dec := yaml.NewDecoder(r)
dec.KnownFields(true)
// Iterate through all defined documents.
for {
var manifests yaml.Node
if err = dec.Decode(&manifests); err != nil {
if errors.Is(err, io.EOF) {
return decoded, nil
}
return nil, fmt.Errorf("decode error: %w", err)
}
if manifests.Kind != yaml.DocumentNode {
return nil, fmt.Errorf("expected a document")
}
for _, manifest := range manifests.Content {
var target interface{}
if target, err = decode(manifest); err != nil {
return nil, err
}
decoded = append(decoded, target)
}
}
}
//nolint:gocyclo,cyclop
func decode(manifest *yaml.Node) (target interface{}, err error) {
var (
version string
kind string
spec *yaml.Node
)
for i, node := range manifest.Content {
switch node.Value {
case ManifestKindKey:
if len(manifest.Content) < i+1 {
return nil, fmt.Errorf("missing manifest content")
}
if err = manifest.Content[i+1].Decode(&kind); err != nil {
return nil, fmt.Errorf("kind decode: %w", err)
}
case ManifestVersionKey:
if len(manifest.Content) < i+1 {
return nil, fmt.Errorf("missing manifest content")
}
if err = manifest.Content[i+1].Decode(&version); err != nil {
return nil, fmt.Errorf("version decode: %w", err)
}
case ManifestSpecKey:
if len(manifest.Content) < i+1 {
return nil, fmt.Errorf("missing manifest content")
}
spec = manifest.Content[i+1]
case ManifestDeprecatedKey:
if target, err = config.New("v1alpha1", ""); err != nil {
return nil, fmt.Errorf("new deprecated config: %w", err)
}
if err = manifest.Decode(target); err != nil {
return nil, fmt.Errorf("deprecated decode: %w", err)
}
if err = validate(target, manifest); err != nil {
return nil, err
}
return target, nil
}
}
if kind == "" {
return nil, ErrMissingKind
}
if version == "" {
return nil, ErrMissingVersion
}
if spec == nil {
return nil, ErrMissingSpec
}
if spec.Content == nil {
return nil, ErrMissingSpecConent
}
if target, err = config.New(kind, version); err != nil {
return nil, fmt.Errorf("new config: %w", err)
}
if err = spec.Decode(target); err != nil {
return nil, fmt.Errorf("spec decode: %w", err)
}
if err = validate(target, spec); err != nil {
return nil, err
}
return target, nil
}
//nolint:gocyclo
func validate(target interface{}, spec *yaml.Node) error {
node, err := encoder.NewEncoder(target, encoder.WithOmitEmpty(false)).Marshal()
if err != nil {
return err
}
src := map[string]interface{}{}
dst := map[string]interface{}{}
err = spec.Decode(src)
if err != nil {
return err
}
err = node.Decode(dst)
if err != nil {
return err
}
var checkUnknown func(interface{}, interface{}) interface{}
checkUnknown = func(left interface{}, right interface{}) interface{} {
switch v := left.(type) {
case map[string]interface{}:
r, ok := right.(map[string]interface{})
if !ok {
return "type mismatch"
}
unknownKeys := map[string]interface{}{}
for key, value := range v {
if _, ok := r[key]; !ok {
unknownKeys[key] = value
continue
}
if d := checkUnknown(value, r[key]); d != nil {
unknownKeys[key] = d
}
}
if len(unknownKeys) > 0 {
return unknownKeys
}
case []interface{}:
r, ok := right.([]interface{})
if !ok {
return "type mismatch"
}
if len(v) != len(r) {
return "slice length differs"
}
var unknownItems []interface{}
for i, item := range v {
if d := checkUnknown(item, r[i]); d != nil {
unknownItems = append(unknownItems, d)
}
}
if len(unknownItems) > 0 {
return unknownItems
}
}
return nil
}
diff := checkUnknown(src, dst)
if diff != nil {
var data []byte
if data, err = yaml.Marshal(diff); err != nil {
return fmt.Errorf("failed to marshal error summary %w", err)
}
return fmt.Errorf("unknown keys found during decoding:\n%s", string(data))
}
return nil
}