55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package rest
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import "reflect"
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// PayloadMember returns the payload field member of i if there is one, or nil.
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func PayloadMember(i interface{}) interface{} {
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if i == nil {
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return nil
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}
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v := reflect.ValueOf(i).Elem()
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if !v.IsValid() {
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return nil
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}
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if field, ok := v.Type().FieldByName("_"); ok {
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if payloadName := field.Tag.Get("payload"); payloadName != "" {
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field, _ := v.Type().FieldByName(payloadName)
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if field.Tag.Get("type") != "structure" {
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return nil
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}
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payload := v.FieldByName(payloadName)
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if payload.IsValid() || (payload.Kind() == reflect.Ptr && !payload.IsNil()) {
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return payload.Interface()
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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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const nopayloadPayloadType = "nopayload"
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// PayloadType returns the type of a payload field member of i if there is one,
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// or "".
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func PayloadType(i interface{}) string {
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v := reflect.Indirect(reflect.ValueOf(i))
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if !v.IsValid() {
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return ""
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}
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if field, ok := v.Type().FieldByName("_"); ok {
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if noPayload := field.Tag.Get(nopayloadPayloadType); noPayload != "" {
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return nopayloadPayloadType
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}
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if payloadName := field.Tag.Get("payload"); payloadName != "" {
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if member, ok := v.Type().FieldByName(payloadName); ok {
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return member.Tag.Get("type")
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}
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}
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}
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return ""
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}
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