85 lines
2.3 KiB
Go
85 lines
2.3 KiB
Go
|
package lnwire
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"io"
|
||
|
|
"io/ioutil"
|
||
|
|
|
||
|
|
"github.com/lightningnetwork/lnd/tlv"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ExtraOpaqueData is the set of data that was appended to this message, some
|
||
|
|
// of which we may not actually know how to iterate or parse. By holding onto
|
||
|
|
// this data, we ensure that we're able to properly validate the set of
|
||
|
|
// signatures that cover these new fields, and ensure we're able to make
|
||
|
|
// upgrades to the network in a forwards compatible manner.
|
||
|
|
type ExtraOpaqueData []byte
|
||
|
|
|
||
|
|
// Encode attempts to encode the raw extra bytes into the passed io.Writer.
|
||
|
|
func (e *ExtraOpaqueData) Encode(w io.Writer) error {
|
||
|
|
eBytes := []byte((*e)[:])
|
||
|
|
if err := WriteElements(w, eBytes); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Decode attempts to unpack the raw bytes encoded in the passed io.Reader as a
|
||
|
|
// set of extra opaque data.
|
||
|
|
func (e *ExtraOpaqueData) Decode(r io.Reader) error {
|
||
|
|
// First, we'll attempt to read a set of bytes contained within the
|
||
|
|
// passed io.Reader (if any exist).
|
||
|
|
rawBytes, err := ioutil.ReadAll(r)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// If we _do_ have some bytes, then we'll swap out our backing pointer.
|
||
|
|
// This ensures that any struct that embeds this type will properly
|
||
|
|
// store the bytes once this method exits.
|
||
|
|
if len(rawBytes) > 0 {
|
||
|
|
*e = ExtraOpaqueData(rawBytes)
|
||
|
|
} else {
|
||
|
|
*e = make([]byte, 0)
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// PackRecords attempts to encode the set of tlv records into the target
|
||
|
|
// ExtraOpaqueData instance. The records will be encoded as a raw TLV stream
|
||
|
|
// and stored within the backing slice pointer.
|
||
|
|
func (e *ExtraOpaqueData) PackRecords(records ...tlv.Record) error {
|
||
|
|
tlvStream, err := tlv.NewStream(records...)
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
var extraBytesWriter bytes.Buffer
|
||
|
|
if err := tlvStream.Encode(&extraBytesWriter); err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
*e = ExtraOpaqueData(extraBytesWriter.Bytes())
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ExtractRecords attempts to decode any types in the internal raw bytes as if
|
||
|
|
// it were a tlv stream. The set of raw parsed types is returned, and any
|
||
|
|
// passed records (if found in the stream) will be parsed into the proper
|
||
|
|
// tlv.Record.
|
||
|
|
func (e *ExtraOpaqueData) ExtractRecords(records ...tlv.Record) (
|
||
|
|
tlv.TypeMap, error) {
|
||
|
|
|
||
|
|
extraBytesReader := bytes.NewReader(*e)
|
||
|
|
|
||
|
|
tlvStream, err := tlv.NewStream(records...)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return tlvStream.DecodeWithParsedTypes(extraBytesReader)
|
||
|
|
}
|