c4ebd80669
Implements conf.Load to populate tagged structs from a chain of Sources (env, .env, YAML/JSON/TOML, custom). Supports default values, slice separators, nested structs, pointer fields, and a Validator hook. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
package conf
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import (
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"reflect"
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"strconv"
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"strings"
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"time"
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"git.juancwu.dev/juancwu/errx"
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)
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var (
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durationType = reflect.TypeOf(time.Duration(0))
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timeType = reflect.TypeOf(time.Time{})
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byteSliceTyp = reflect.TypeOf([]byte(nil))
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)
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// assignString parses raw into the value pointed to by v. v must be settable.
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func assignString(v reflect.Value, raw, sep string) error {
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const op = "conf.assignString"
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if v.Kind() == reflect.Pointer {
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if v.IsNil() {
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v.Set(reflect.New(v.Type().Elem()))
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}
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return assignString(v.Elem(), raw, sep)
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}
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switch v.Type() {
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case durationType:
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d, err := time.ParseDuration(raw)
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if err != nil {
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return errx.Wrapf(op, err, "parse duration %q", raw)
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}
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v.SetInt(int64(d))
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return nil
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case timeType:
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t, err := time.Parse(time.RFC3339, raw)
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if err != nil {
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return errx.Wrapf(op, err, "parse time %q", raw)
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}
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v.Set(reflect.ValueOf(t))
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return nil
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case byteSliceTyp:
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v.SetBytes([]byte(raw))
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return nil
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}
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switch v.Kind() {
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case reflect.String:
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v.SetString(raw)
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case reflect.Bool:
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b, err := strconv.ParseBool(raw)
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if err != nil {
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return errx.Wrapf(op, err, "parse bool %q", raw)
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}
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v.SetBool(b)
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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n, err := strconv.ParseInt(raw, 10, v.Type().Bits())
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if err != nil {
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return errx.Wrapf(op, err, "parse int %q", raw)
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}
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v.SetInt(n)
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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n, err := strconv.ParseUint(raw, 10, v.Type().Bits())
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if err != nil {
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return errx.Wrapf(op, err, "parse uint %q", raw)
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}
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v.SetUint(n)
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case reflect.Float32, reflect.Float64:
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f, err := strconv.ParseFloat(raw, v.Type().Bits())
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if err != nil {
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return errx.Wrapf(op, err, "parse float %q", raw)
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}
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v.SetFloat(f)
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case reflect.Slice:
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if sep == "" {
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sep = ","
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}
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parts := strings.Split(raw, sep)
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out := reflect.MakeSlice(v.Type(), len(parts), len(parts))
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for i, p := range parts {
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if err := assignString(out.Index(i), strings.TrimSpace(p), sep); err != nil {
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return err
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}
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}
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v.Set(out)
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default:
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return errx.Newf(op, "unsupported field type %s", v.Type())
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}
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return nil
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}
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