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Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
371 lines
8.0 KiB
Go
371 lines
8.0 KiB
Go
package env // import "go.unistack.org/micro-config-env/v4"
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import (
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"context"
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"fmt"
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"os"
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"reflect"
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"strconv"
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"strings"
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"github.com/imdario/mergo"
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"go.unistack.org/micro/v4/config"
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"go.unistack.org/micro/v4/options"
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rutil "go.unistack.org/micro/v4/util/reflect"
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)
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var DefaultStructTag = "env"
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type envConfig struct {
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opts config.Options
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}
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func (c *envConfig) Options() config.Options {
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return c.opts
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}
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func (c *envConfig) 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 := config.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 := config.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 *envConfig) Load(ctx context.Context, opts ...options.Option) error {
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if err := config.DefaultBeforeLoad(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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}
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options := config.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 err = fillValues(ctx, 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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}
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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 := config.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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func fillValue(ctx context.Context, value reflect.Value, val string) error {
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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(ctx, mkey, kv[0]); err != nil {
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return err
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}
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if err := fillValue(ctx, 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(ctx, 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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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(float64(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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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(int64(v)))
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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(uint64(v)))
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}
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return nil
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}
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func (c *envConfig) setValues(ctx context.Context, valueOf reflect.Value) 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 config.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 rutil.IsZero(value) {
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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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if err := c.setValues(ctx, value); 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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value = value.Elem()
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if err := c.setValues(ctx, value); 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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tags, ok := field.Tag.Lookup(c.opts.StructTag)
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if !ok {
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continue
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}
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for _, tag := range strings.Split(tags, ",") {
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if err := os.Setenv(tag, fmt.Sprintf("%v", value.Interface())); err != nil && !c.opts.AllowFail {
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return err
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}
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}
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}
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return nil
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}
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func fillValues(ctx context.Context, valueOf reflect.Value, structTag 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 config.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(ctx, value, structTag); 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(ctx, value, structTag); 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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tags, ok := field.Tag.Lookup(structTag)
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if !ok {
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continue
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}
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var eval string
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for _, tag := range strings.Split(tags, ",") {
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if val, ok := os.LookupEnv(tag); !ok {
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continue
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} else {
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eval = val
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}
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}
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if eval == "" {
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continue
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}
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if err := fillValue(ctx, value, eval); 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 *envConfig) Save(ctx context.Context, opts ...options.Option) error {
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options := config.NewSaveOptions(opts...)
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if err := config.DefaultBeforeSave(ctx, c); err != nil && !c.opts.AllowFail {
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return err
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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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if err := c.setValues(ctx, reflect.ValueOf(dst)); err != nil && !c.opts.AllowFail {
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return err
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}
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if err := config.DefaultAfterSave(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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func (c *envConfig) String() string {
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return "env"
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}
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func (c *envConfig) Name() string {
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return c.opts.Name
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}
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func (c *envConfig) Watch(ctx context.Context, opts ...options.Option) (config.Watcher, error) {
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w := &envWatcher{
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opts: c.opts,
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wopts: config.NewWatchOptions(opts...),
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done: make(chan struct{}),
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vchan: make(chan map[string]interface{}),
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echan: make(chan error),
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}
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go w.run()
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return w, nil
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}
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func NewConfig(opts ...options.Option) config.Config {
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options := config.NewOptions(opts...)
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if len(options.StructTag) == 0 {
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options.StructTag = DefaultStructTag
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}
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return &envConfig{opts: options}
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}
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