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parse.go
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parse.go
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package manifest
import (
"bufio"
"bytes"
"fmt"
"log"
"strings"
yaml "gopkg.in/yaml.v2"
"k8s.io/helm/pkg/proto/hapi/release"
)
const (
hookAnnotation = "helm.sh/hook"
)
var yamlSeperator = []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], "/")
}
return fmt.Sprintf("%s, %s, %s (%s)", m.Metadata.Namespace, m.Metadata.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, yamlSeperator); i >= 0 {
// We have a full newline-terminated line.
return i + len(yamlSeperator), 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
}
func splitSpec(token string) (string, string) {
if i := strings.Index(token, "\n"); i >= 0 {
return token[0:i], token[i+1:]
}
return "", ""
}
// ParseRelease parses release objects into MappingResult
func ParseRelease(release *release.Release, includeTests bool) map[string]*MappingResult {
manifest := release.Manifest
for _, hook := range release.Hooks {
if !includeTests && isTestHook(hook.Events) {
continue
}
manifest += "\n---\n"
manifest += fmt.Sprintf("# Source: %s\n", hook.Path)
manifest += hook.Manifest
}
return Parse(manifest, release.Namespace)
}
// Parse parses manifest strings into MappingResult
func Parse(manifest string, defaultNamespace string, excludedHooks ...string) map[string]*MappingResult {
scanner := bufio.NewScanner(strings.NewReader(manifest))
scanner.Split(scanYamlSpecs)
//Allow for tokens (specs) up to 1M in size
scanner.Buffer(make([]byte, bufio.MaxScanTokenSize), 1048576)
//Discard the first result, we only care about everything after the first separator
scanner.Scan()
result := make(map[string]*MappingResult)
for scanner.Scan() {
content := strings.TrimSpace(scanner.Text())
if content == "" {
continue
}
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 == "" {
continue
}
if isHook(parsedMetadata, excludedHooks...) {
continue
}
if parsedMetadata.Metadata.Namespace == "" {
parsedMetadata.Metadata.Namespace = defaultNamespace
}
name := parsedMetadata.String()
if _, ok := result[name]; ok {
log.Printf("Error: Found duplicate key %#v in manifest", name)
} else {
result[name] = &MappingResult{
Name: name,
Kind: parsedMetadata.Kind,
Content: content,
}
}
}
if err := scanner.Err(); err != nil {
log.Fatalf("Error reading input: %s", err)
}
return result
}
func isHook(metadata metadata, hooks ...string) bool {
for _, hook := range hooks {
if metadata.Metadata.Annotations[hookAnnotation] == hook {
return true
}
}
return false
}
func isTestHook(hookEvents []release.Hook_Event) bool {
for _, event := range hookEvents {
if event == release.Hook_RELEASE_TEST_FAILURE || event == release.Hook_RELEASE_TEST_SUCCESS {
return true
}
}
return false
}