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https://github.com/nspcc-dev/neo-go.git
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66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
package nns
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import (
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// RecordState is a type that registered entities are saved as.
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type RecordState struct {
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Name string
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Type RecordType
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Data string
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}
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// RecordType is domain name service record types.
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type RecordType byte
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// Record types are defined in [RFC 1035](https://tools.ietf.org/html/rfc1035)
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const (
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// A represents address record type.
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A RecordType = 1
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// CNAME represents canonical name record type.
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CNAME RecordType = 5
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// TXT represents text record type.
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TXT RecordType = 16
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)
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// Record types are defined in [RFC 3596](https://tools.ietf.org/html/rfc3596)
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const (
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// AAAA represents IPv6 address record type.
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AAAA RecordType = 28
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)
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// FromStackItem fills RecordState with data from the given stack item if it can
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// be correctly converted to RecordState.
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func (r *RecordState) FromStackItem(itm stackitem.Item) error {
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rs, ok := itm.Value().([]stackitem.Item)
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if !ok {
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return errors.New("not a struct")
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}
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if len(rs) != 3 {
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return errors.New("wrong number of elements")
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}
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name, err := rs[0].TryBytes()
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if err != nil {
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return fmt.Errorf("bad name: %w", err)
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}
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typ, err := rs[1].TryInteger()
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if err != nil {
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return fmt.Errorf("bad type: %w", err)
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}
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data, err := rs[2].TryBytes()
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if err != nil {
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return fmt.Errorf("bad data: %w", err)
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}
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u64Typ := typ.Uint64()
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if !typ.IsUint64() || u64Typ > 255 {
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return errors.New("bad type")
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}
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r.Name = string(name)
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r.Type = RecordType(u64Typ)
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r.Data = string(data)
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return nil
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}
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