/
parse.go
186 lines (157 loc) · 4.65 KB
/
parse.go
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package manifest
import (
"bufio"
"bytes"
"fmt"
"log"
"strings"
"gopkg.in/yaml.v2"
)
const (
hookAnnotation = "helm.sh/hook"
)
var yamlSeparator = []byte("\n---\n")
// MappingResult to store result of diff
type MappingResult struct {
Name string
Kind string
Content string
}
type metadata struct {
APIVersion string `yaml:"apiVersion"`
Kind string
Metadata struct {
Namespace string
Name string
Annotations map[string]string
}
}
func (m metadata) String() string {
apiBase := m.APIVersion
sp := strings.Split(apiBase, "/")
if len(sp) > 1 {
apiBase = strings.Join(sp[:len(sp)-1], "/")
}
name := m.Metadata.Name
if a := m.Metadata.Annotations; a != nil {
if baseName, ok := a["helm-diff/base-name"]; ok {
name = baseName
}
}
return fmt.Sprintf("%s, %s, %s (%s)", m.Metadata.Namespace, name, m.Kind, apiBase)
}
func scanYamlSpecs(data []byte, atEOF bool) (advance int, token []byte, err error) {
if atEOF && len(data) == 0 {
return 0, nil, nil
}
if i := bytes.Index(data, yamlSeparator); i >= 0 {
// We have a full newline-terminated line.
return i + len(yamlSeparator), data[0:i], nil
}
// If we're at EOF, we have a final, non-terminated line. Return it.
if atEOF {
return len(data), data, nil
}
// Request more data.
return 0, nil, nil
}
// Parse parses manifest strings into MappingResult
func Parse(manifest string, defaultNamespace string, normalizeManifests bool, excludedHooks ...string) map[string]*MappingResult {
// Ensure we have a newline in front of the yaml separator
scanner := bufio.NewScanner(strings.NewReader("\n" + manifest))
scanner.Split(scanYamlSpecs)
// Allow for tokens (specs) up to 10MiB in size
scanner.Buffer(make([]byte, bufio.MaxScanTokenSize), 10485760)
result := make(map[string]*MappingResult)
for scanner.Scan() {
content := strings.TrimSpace(scanner.Text())
if content == "" {
continue
}
parsed, err := parseContent(content, defaultNamespace, normalizeManifests, excludedHooks...)
if err != nil {
log.Fatalf("%v", err)
}
for _, p := range parsed {
name := p.Name
if _, ok := result[name]; ok {
log.Printf("Error: Found duplicate key %#v in manifest", name)
} else {
result[name] = p
}
}
}
if err := scanner.Err(); err != nil {
log.Fatalf("Error reading input: %s", err)
}
return result
}
func parseContent(content string, defaultNamespace string, normalizeManifests bool, excludedHooks ...string) ([]*MappingResult, error) {
var parsedMetadata metadata
if err := yaml.Unmarshal([]byte(content), &parsedMetadata); err != nil {
log.Fatalf("YAML unmarshal error: %s\nCan't unmarshal %s", err, content)
}
// Skip content without any metadata. It is probably a template that
// only contains comments in the current state.
if parsedMetadata.APIVersion == "" && parsedMetadata.Kind == "" {
return nil, nil
}
if parsedMetadata.Kind == "List" {
type ListV1 struct {
Items []yaml.MapSlice `yaml:"items"`
}
var list ListV1
if err := yaml.Unmarshal([]byte(content), &list); err != nil {
log.Fatalf("YAML unmarshal error: %s\nCan't unmarshal %s", err, content)
}
var result []*MappingResult
for _, item := range list.Items {
subcontent, err := yaml.Marshal(item)
if err != nil {
log.Printf("YAML marshal error: %s\nCan't marshal %v", err, item)
}
subs, err := parseContent(string(subcontent), defaultNamespace, normalizeManifests, excludedHooks...)
if err != nil {
return nil, fmt.Errorf("Parsing YAML list item: %v", err)
}
result = append(result, subs...)
}
return result, nil
}
if normalizeManifests {
// Unmarshal and marshal again content to normalize yaml structure
// This avoids style differences to show up as diffs but it can
// make the output different from the original template (since it is in normalized form)
var object map[interface{}]interface{}
if err := yaml.Unmarshal([]byte(content), &object); err != nil {
log.Fatalf("YAML unmarshal error: %s\nCan't unmarshal %s", err, content)
}
normalizedContent, err := yaml.Marshal(object)
if err != nil {
log.Fatalf("YAML marshal error: %s\nCan't marshal %v", err, object)
}
content = string(normalizedContent)
}
if isHook(parsedMetadata, excludedHooks...) {
return nil, nil
}
if parsedMetadata.Metadata.Namespace == "" {
parsedMetadata.Metadata.Namespace = defaultNamespace
}
name := parsedMetadata.String()
return []*MappingResult{
{
Name: name,
Kind: parsedMetadata.Kind,
Content: content,
},
}, nil
}
func isHook(metadata metadata, hooks ...string) bool {
for _, hook := range hooks {
if metadata.Metadata.Annotations[hookAnnotation] == hook {
return true
}
}
return false
}