lightningnetwork / lnd / 15736109134

package zpay32

import (

        "github.com/btcsuite/btcd/btcec/v2"

        "github.com/lightningnetwork/lnd/lnwire"

)

const (

        // DefaultAssumedFinalCLTVDelta is the default value to be used as the

        // final CLTV delta for a route if one is unspecified in the payment

        // request.

        // We adhere to the recommendation in BOLT 02 for terminal payments.

        // See also:

        // https://github.com/lightning/bolts/blob/master/02-peer-protocol.md

        DefaultAssumedFinalCLTVDelta = 18

        // feeRateParts is the total number of parts used to express fee rates.

        feeRateParts = 1e6

)

// HopHint is a routing hint that contains the minimum information of a channel

// required for an intermediate hop in a route to forward the payment to the

// next. This should be ideally used for private channels, since they are not

// publicly advertised to the network for routing.

type HopHint struct {

        // NodeID is the public key of the node at the start of the channel.

        NodeID *btcec.PublicKey

        // ChannelID is the unique identifier of the channel.

        ChannelID uint64

        // FeeBaseMSat is the base fee of the channel in millisatoshis.

        FeeBaseMSat uint32

        // FeeProportionalMillionths is the fee rate, in millionths of a

        // satoshi, for every satoshi sent through the channel.

        FeeProportionalMillionths uint32

        // CLTVExpiryDelta is the time-lock delta of the channel.

        CLTVExpiryDelta uint16

}

// Copy returns a deep copy of the hop hint.

// HopFee calculates the fee for a given amount that is forwarded over a hop.

// The amount has to be denoted in milli satoshi. The returned fee is also

// denoted in milli satoshi.