lnd.xprv/record/hop.go
2019-09-04 12:05:10 -07:00

48 lines
1.3 KiB
Go

package record
import (
"github.com/lightningnetwork/lnd/tlv"
)
const (
// AmtOnionType is the type used in the onion to refrence the amount to
// send to the next hop.
AmtOnionType tlv.Type = 2
// LockTimeTLV is the type used in the onion to refenernce the CLTV
// value that should be used for the next hop's HTLC.
LockTimeOnionType tlv.Type = 4
// NextHopOnionType is the type used in the onion to reference the ID
// of the next hop.
NextHopOnionType tlv.Type = 6
)
// NewAmtToFwdRecord creates a tlv.Record that encodes the amount_to_forward
// (type 2) for an onion payload.
func NewAmtToFwdRecord(amt *uint64) tlv.Record {
return tlv.MakeDynamicRecord(
AmtOnionType, amt, func() uint64 {
return tlv.SizeTUint64(*amt)
},
tlv.ETUint64, tlv.DTUint64,
)
}
// NewLockTimeRecord creates a tlv.Record that encodes the outgoing_cltv_value
// (type 4) for an onion payload.
func NewLockTimeRecord(lockTime *uint32) tlv.Record {
return tlv.MakeDynamicRecord(
LockTimeOnionType, lockTime, func() uint64 {
return tlv.SizeTUint32(*lockTime)
},
tlv.ETUint32, tlv.DTUint32,
)
}
// NewNextHopIDRecord creates a tlv.Record that encodes the short_channel_id
// (type 6) for an onion payload.
func NewNextHopIDRecord(cid *uint64) tlv.Record {
return tlv.MakePrimitiveRecord(NextHopOnionType, cid)
}