/
vals.go
114 lines (100 loc) · 2.71 KB
/
vals.go
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package parser
import (
"fmt"
"io"
"net/url"
"os"
"strings"
"gopkg.in/yaml.v3"
"helm.sh/helm/v3/pkg/getter"
"helm.sh/helm/v3/pkg/strvals"
)
type ValueOptions struct {
ValueFiles []string
StringValues []string
Values []string
FileValues []string
}
// MergeValues merges values from files specified via -f/--values and directly
// via --set, --set-string, or --set-file, marshaling them to YAML
func (opts *ValueOptions) MergeValues() (map[string]interface{}, error) {
base := map[string]interface{}{}
// User specified a values files via -f/--values
for _, filePath := range opts.ValueFiles {
currentMap := map[string]interface{}{}
bytes, err := readFile(filePath)
if err != nil {
return nil, err
}
if err := yaml.Unmarshal(bytes, ¤tMap); err != nil {
return nil, fmt.Errorf("failed to parse %s: %w", filePath, err)
}
// Merge with the previous map
base = mergeMaps(base, currentMap)
}
// User specified a value via --set
for _, value := range opts.Values {
if err := strvals.ParseInto(value, base); err != nil {
return nil, fmt.Errorf("failed parsing --set data, %w", err)
}
}
// User specified a value via --set-string
for _, value := range opts.StringValues {
if err := strvals.ParseIntoString(value, base); err != nil {
return nil, fmt.Errorf("failed parsing --set-string data %w", err)
}
}
// User specified a value via --set-file
for _, value := range opts.FileValues {
reader := func(rs []rune) (interface{}, error) {
bytes, err := readFile(string(rs))
if err != nil {
return nil, err
}
return string(bytes), err
}
if err := strvals.ParseIntoFile(value, base, reader); err != nil {
return nil, fmt.Errorf("failed parsing --set-file data: %w", err)
}
}
return base, nil
}
func mergeMaps(a, b map[string]interface{}) map[string]interface{} {
out := make(map[string]interface{}, len(a))
for k, v := range a {
out[k] = v
}
for k, v := range b {
if v, ok := v.(map[string]interface{}); ok {
if bv, ok := out[k]; ok {
if bv, ok := bv.(map[string]interface{}); ok {
out[k] = mergeMaps(bv, v)
continue
}
}
}
out[k] = v
}
return out
}
// readFile load a file from stdin, the local directory, or a remote file with a url.
func readFile(filePath string) ([]byte, error) {
if strings.TrimSpace(filePath) == "-" {
return io.ReadAll(os.Stdin)
}
u, _ := url.Parse(filePath)
// FIXME: maybe someone handle other protocols like ftp.
if u.Scheme == "http" || u.Scheme == "https" {
g, err := getter.NewHTTPGetter()
if err != nil {
return nil, err
}
data, err := g.Get(filePath, getter.WithURL(filePath))
if err != nil {
return nil, err
}
return data.Bytes(), err
} else {
return os.ReadFile(filePath)
}
}