327 lines
7.1 KiB
Go
327 lines
7.1 KiB
Go
package config
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import (
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"context"
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"reflect"
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"strconv"
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"strings"
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"time"
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"github.com/google/uuid"
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"github.com/imdario/mergo"
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"go.unistack.org/micro/v4/options"
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mid "go.unistack.org/micro/v4/util/id"
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rutil "go.unistack.org/micro/v4/util/reflect"
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mtime "go.unistack.org/micro/v4/util/time"
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)
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type defaultConfig struct {
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opts Options
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}
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func (c *defaultConfig) Options() Options {
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return c.opts
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}
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func (c *defaultConfig) Init(opts ...options.Option) error {
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for _, o := range opts {
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o(&c.opts)
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}
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if err := DefaultBeforeInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
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return err
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}
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if err := DefaultAfterInit(c.opts.Context, c); err != nil && !c.opts.AllowFail {
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return err
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}
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return nil
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}
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func (c *defaultConfig) Load(ctx context.Context, opts ...options.Option) error {
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if err := DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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}
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options := NewLoadOptions(opts...)
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mopts := []func(*mergo.Config){mergo.WithTypeCheck}
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if options.Override {
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mopts = append(mopts, mergo.WithOverride)
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}
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if options.Append {
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mopts = append(mopts, mergo.WithAppendSlice)
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}
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dst := c.opts.Struct
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if options.Struct != nil {
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dst = options.Struct
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}
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src, err := rutil.Zero(dst)
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if err != nil {
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if !c.opts.AllowFail {
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return err
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}
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if err = DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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}
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}
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if err = fillValues(reflect.ValueOf(src), c.opts.StructTag); err == nil {
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err = mergo.Merge(dst, src, mopts...)
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}
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if err != nil && !c.opts.AllowFail {
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return err
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}
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if err := DefaultAfterLoad(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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}
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return nil
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}
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//nolint:gocyclo
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func fillValue(value reflect.Value, val string) error {
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if !rutil.IsEmpty(value) {
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return nil
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}
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switch value.Kind() {
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case reflect.Map:
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t := value.Type()
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nvals := strings.FieldsFunc(val, func(c rune) bool { return c == ',' || c == ';' })
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if value.IsNil() {
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value.Set(reflect.MakeMapWithSize(t, len(nvals)))
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}
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kt := t.Key()
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et := t.Elem()
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for _, nval := range nvals {
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kv := strings.FieldsFunc(nval, func(c rune) bool { return c == '=' })
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mkey := reflect.Indirect(reflect.New(kt))
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mval := reflect.Indirect(reflect.New(et))
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if err := fillValue(mkey, kv[0]); err != nil {
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return err
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}
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if err := fillValue(mval, kv[1]); err != nil {
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return err
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}
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value.SetMapIndex(mkey, mval)
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}
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case reflect.Slice, reflect.Array:
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nvals := strings.FieldsFunc(val, func(c rune) bool { return c == ',' || c == ';' })
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value.Set(reflect.MakeSlice(reflect.SliceOf(value.Type().Elem()), len(nvals), len(nvals)))
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for idx, nval := range nvals {
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nvalue := reflect.Indirect(reflect.New(value.Type().Elem()))
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if err := fillValue(nvalue, nval); err != nil {
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return err
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}
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value.Index(idx).Set(nvalue)
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}
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case reflect.Bool:
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v, err := strconv.ParseBool(val)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(v))
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case reflect.String:
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switch val {
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case "micro:generate uuid":
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uid, err := uuid.NewRandom()
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if err != nil {
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return err
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}
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val = uid.String()
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case "micro:generate id":
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uid, err := mid.New()
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if err != nil {
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return err
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}
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val = uid
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}
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value.Set(reflect.ValueOf(val))
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case reflect.Float32:
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v, err := strconv.ParseFloat(val, 32)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(float32(v)))
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case reflect.Float64:
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v, err := strconv.ParseFloat(val, 64)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(v))
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case reflect.Int:
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v, err := strconv.ParseInt(val, 10, 0)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(int(v)))
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case reflect.Int8:
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v, err := strconv.ParseInt(val, 10, 8)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(v))
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case reflect.Int16:
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v, err := strconv.ParseInt(val, 10, 16)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(int16(v)))
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case reflect.Int32:
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v, err := strconv.ParseInt(val, 10, 32)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(int32(v)))
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case reflect.Int64:
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switch {
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case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "time":
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v, err := time.ParseDuration(val)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(v))
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case value.Type().String() == "time.Duration" && value.Type().PkgPath() == "go.unistack.org/micro/v4/util/time":
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v, err := mtime.ParseDuration(val)
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if err != nil {
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return err
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}
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value.SetInt(int64(v))
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default:
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v, err := strconv.ParseInt(val, 10, 64)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(v))
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}
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case reflect.Uint:
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v, err := strconv.ParseUint(val, 10, 0)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(uint(v)))
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case reflect.Uint8:
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v, err := strconv.ParseUint(val, 10, 8)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(uint8(v)))
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case reflect.Uint16:
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v, err := strconv.ParseUint(val, 10, 16)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(uint16(v)))
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case reflect.Uint32:
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v, err := strconv.ParseUint(val, 10, 32)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(uint32(v)))
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case reflect.Uint64:
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v, err := strconv.ParseUint(val, 10, 64)
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if err != nil {
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return err
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}
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value.Set(reflect.ValueOf(v))
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}
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return nil
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}
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func fillValues(valueOf reflect.Value, tname string) error {
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var values reflect.Value
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if valueOf.Kind() == reflect.Ptr {
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values = valueOf.Elem()
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} else {
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values = valueOf
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}
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if values.Kind() == reflect.Invalid {
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return ErrInvalidStruct
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}
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fields := values.Type()
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for idx := 0; idx < fields.NumField(); idx++ {
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field := fields.Field(idx)
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value := values.Field(idx)
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if !value.CanSet() {
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continue
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}
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if len(field.PkgPath) != 0 {
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continue
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}
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switch value.Kind() {
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case reflect.Struct:
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value.Set(reflect.Indirect(reflect.New(value.Type())))
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if err := fillValues(value, tname); err != nil {
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return err
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}
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continue
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case reflect.Ptr:
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if value.IsNil() {
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if value.Type().Elem().Kind() != reflect.Struct {
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// nil pointer to a non-struct: leave it alone
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break
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}
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// nil pointer to struct: create a zero instance
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value.Set(reflect.New(value.Type().Elem()))
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}
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value = value.Elem()
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if err := fillValues(value, tname); err != nil {
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return err
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}
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continue
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}
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tag, ok := field.Tag.Lookup(tname)
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if !ok {
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continue
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}
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if err := fillValue(value, tag); err != nil {
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return err
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}
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}
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return nil
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}
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func (c *defaultConfig) Save(ctx context.Context, opts ...options.Option) error {
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if err := DefaultBeforeSave(ctx, c); err != nil {
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return err
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}
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if err := DefaultAfterSave(ctx, c); err != nil {
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return err
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}
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return nil
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}
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func (c *defaultConfig) String() string {
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return "default"
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}
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func (c *defaultConfig) Name() string {
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return c.opts.Name
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}
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func (c *defaultConfig) Watch(ctx context.Context, opts ...options.Option) (Watcher, error) {
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return nil, ErrWatcherNotImplemented
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}
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// NewConfig returns new default config source
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func NewConfig(opts ...options.Option) Config {
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options := NewOptions(opts...)
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if len(options.StructTag) == 0 {
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options.StructTag = "default"
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}
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return &defaultConfig{opts: options}
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}
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