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main.go
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main.go
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package main
import (
"flag"
"fmt"
"os"
"reflect"
"strconv"
"strings"
"text/template"
"github.com/target/goalert/config"
)
func hasType(typeName string, fields []field) bool {
for _, f := range fields {
if f.Type == typeName {
return true
}
}
return false
}
var tmpl = template.Must(
template.
New("mapconfig.go").
Funcs(template.FuncMap{
"quote": strconv.Quote,
"hasBool": func(fields []field) bool { return hasType("ConfigTypeBoolean", fields) },
"hasStrList": func(fields []field) bool { return hasType("ConfigTypeStringList", fields) },
"hasInt": func(fields []field) bool { return hasType("ConfigTypeInteger", fields) },
}).
Parse(`
import (
"github.com/target/goalert/config"
"github.com/target/goalert/validation"
)
func MapConfigHints(cfg config.Hints) []ConfigHint {
return []ConfigHint{
{{- range .HintFields }}
{ID: {{quote .ID}}, Value: {{.Value}}},
{{- end}}
}
}
// MapConfigValues will map a Config struct into a flat list of ConfigValue structs.
func MapConfigValues(cfg config.Config) []ConfigValue {
return []ConfigValue{
{{- range .ConfigFields }}
{ID: {{quote .ID}}, Type: {{.Type}}, Description: {{quote .Desc}}, Value: {{.Value}}{{if .Password}}, Password: true{{end}}},
{{- end}}
}
}
// MapPublicConfigValues will map a Config struct into a flat list of ConfigValue structs.
func MapPublicConfigValues(cfg config.Config) []ConfigValue {
return []ConfigValue{
{{- range .ConfigFields }}
{{- if .Public}}
{ID: {{quote .ID}}, Type: {{.Type}}, Description: {{quote .Desc}}, Value: {{.Value}}{{if .Password}}, Password: true{{end}}},
{{- end}}
{{- end}}
}
}
// ApplyConfigValues will apply a list of ConfigValues to a Config struct.
func ApplyConfigValues(cfg config.Config, vals []ConfigValueInput) (config.Config, error) {
{{- if hasStrList .ConfigFields}}
parseStringList := func(v string) []string {
if v == "" {
return nil
}
return strings.Split(v, "\n")
}
{{- end}}
{{- if hasInt .ConfigFields}}
parseInt := func(id, v string) (int, error) {
if v == "" {
return 0, nil
}
val, err := strconv.ParseInt(v, 10, 64)
if err != nil {
return 0, validation.NewFieldError("\""+id+"\".Value", "integer value invalid: " + err.Error())
}
return int(val), nil
}
{{- end}}
{{- if hasBool .ConfigFields}}
parseBool := func(id, v string) (bool, error) {
switch v {
case "true":
return true, nil
case "false":
return false, nil
default:
return false, validation.NewFieldError("\""+id+"\".Value", "boolean value invalid: expected 'true' or 'false'")
}
}
{{- end}}
for _, v := range vals {
switch v.ID {
{{- range .ConfigFields}}
case {{quote .ID}}:
{{- if eq .Type "ConfigTypeString"}}
cfg.{{.ID}} = v.Value
{{- else if eq .Type "ConfigTypeStringList"}}
cfg.{{.ID}} = parseStringList(v.Value)
{{- else if eq .Type "ConfigTypeInteger"}}
val, err := parseInt(v.ID, v.Value)
if err != nil {
return cfg, err
}
cfg.{{.ID}} = val
{{- else if eq .Type "ConfigTypeBoolean"}}
val, err := parseBool(v.ID, v.Value)
if err != nil {
return cfg, err
}
cfg.{{.ID}} = val
{{- end}}
{{- end}}
default:
return cfg, validation.NewFieldError("ID", fmt.Sprintf("unknown config ID '%s'", v.ID))
}
}
return cfg, nil
}
`))
type field struct {
ID, Type, Desc, Value string
Public, Password bool
}
func main() {
out := flag.String("out", "", "Output file.")
flag.Parse()
w := os.Stdout
if *out != "" {
fd, err := os.Create(*out)
if err != nil {
panic(err)
}
defer fd.Close()
w = fd
}
fmt.Fprintln(w, `// Code generated by devtools/configparams DO NOT EDIT.
package graphql2`)
var input struct {
ConfigFields []field
HintFields []field
}
input.ConfigFields = printType("", reflect.TypeOf(config.Config{}), "", false, false)
input.HintFields = printType("", reflect.TypeOf(config.Hints{}), "", false, false)
err := tmpl.Execute(w, input)
if err != nil {
panic(err)
}
}
func printField(prefix string, f reflect.StructField) []field {
fPrefix := prefix + f.Name + "."
if f.Type.Kind() == reflect.Slice && f.Type.Elem().Kind() == reflect.Struct {
fPrefix = prefix + f.Name + "[]."
}
return printType(fPrefix, f.Type, f.Tag.Get("info"), f.Tag.Get("public") == "true", f.Tag.Get("password") == "true")
}
func printType(prefix string, v reflect.Type, details string, public, pass bool) []field {
var f []field
key := strings.TrimSuffix(prefix, ".")
var typ, value string
switch v.Kind() {
case reflect.Struct:
for i := 0; i < v.NumField(); i++ {
if v.Field(i).PkgPath != "" {
// skip unexported fields
continue
}
f = append(f, printField(prefix, v.Field(i))...)
}
return f
case reflect.Bool:
typ = "ConfigTypeBoolean"
value = fmt.Sprintf(`fmt.Sprintf("%%t", cfg.%s)`, key)
case reflect.String:
typ = "ConfigTypeString"
value = fmt.Sprintf(`cfg.%s`, key)
case reflect.Int:
typ = "ConfigTypeInteger"
value = fmt.Sprintf(`fmt.Sprintf("%%d", cfg.%s)`, key)
case reflect.Slice:
switch v.Elem().Kind() {
case reflect.String:
typ = "ConfigTypeStringList"
value = fmt.Sprintf(`strings.Join(cfg.%s, "\n")`, key)
default:
panic(fmt.Sprintf("not implemented for type []%v", v.Elem().Kind()))
}
default:
panic(fmt.Sprintf("not implemented for type %T", v.Kind()))
}
f = append(f, field{ID: key, Type: typ, Desc: details, Value: value, Public: public, Password: pass})
return f
}