lnd.xprv/lnwire/funding_response.go

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package lnwire
import (
"fmt"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"io"
)
type FundingResponse struct {
ChannelType uint8
ReservationID uint64
ResponderFundingAmount btcutil.Amount // Responder's funding amount
ResponderReserveAmount btcutil.Amount // Responder's reserve amount
MinFeePerKb btcutil.Amount // Lock-in min fee
// Minimum depth
MinDepth uint32
// CLTV/CSV lock-time to use
LockTime uint32
// Who pays the fees
// 0: (default) channel initiator
// 1: split
// 2: channel responder
FeePayer uint8
RevocationHash [20]byte
Pubkey *btcec.PublicKey
CommitSig *btcec.Signature // Requester's Commitment
DeliveryPkScript PkScript // *MUST* be either P2PKH or P2SH
ChangePkScript PkScript // *MUST* be either P2PKH or P2SH
Inputs []*wire.TxIn
}
func (c *FundingResponse) Decode(r io.Reader, pver uint32) error {
// ReservationID (8)
// Channel Type (1)
// Funding Amount (8)
// Revocation Hash (20)
// Commitment Pubkey (32)
// Reserve Amount (8)
// Minimum Transaction Fee Per Kb (8)
// MinDepth (4)
// LockTime (4)
// FeePayer (1)
// DeliveryPkScript (final delivery)
// First byte length then pkscript
// ChangePkScript (change for extra from inputs)
// First byte length then pkscript
// CommitSig
// First byte length then sig
// Inputs: Create the TxIns
// First byte is number of inputs
// For each input, it's 32bytes txin & 4bytes index
err := readElements(r,
&c.ReservationID,
&c.ChannelType,
&c.ResponderFundingAmount,
&c.RevocationHash,
&c.Pubkey,
&c.ResponderReserveAmount,
&c.MinFeePerKb,
&c.MinDepth,
&c.LockTime,
&c.FeePayer,
&c.DeliveryPkScript,
&c.ChangePkScript,
&c.CommitSig,
&c.Inputs)
if err != nil {
return err
}
return nil
}
// Creates a new FundingResponse
func NewFundingResponse() *FundingResponse {
return &FundingResponse{}
}
// Serializes the item from the FundingResponse struct
// Writes the data to w
func (c *FundingResponse) Encode(w io.Writer, pver uint32) error {
// ReservationID (8)
// Channel Type (1)
// Funding Amount (8)
// Revocation Hash (20)
// Commitment Pubkey (32)
// Reserve Amount (8)
// Minimum Transaction Fee Per Kb (8)
// LockTime (4)
// FeePayer (1)
// DeliveryPkScript (final delivery)
// ChangePkScript (change for extra from inputs)
// CommitSig
// Inputs
err := writeElements(w,
c.ReservationID,
c.ChannelType,
c.ResponderFundingAmount,
c.RevocationHash,
c.Pubkey,
c.ResponderReserveAmount,
c.MinFeePerKb,
c.MinDepth,
c.LockTime,
c.FeePayer,
c.DeliveryPkScript,
c.ChangePkScript,
c.CommitSig,
c.Inputs)
if err != nil {
return err
}
return nil
}
func (c *FundingResponse) Command() uint32 {
return CmdFundingResponse
}
func (c *FundingResponse) MaxPayloadLength(uint32) uint32 {
// 86 (base size) + 26 (pkscript) + 26 (pkscript) + 74sig + 1 (numTxes) + 127*36(127 inputs * sha256+idx)
return 4785
}
// Makes sure the struct data is valid (e.g. no negatives or invalid pkscripts)
func (c *FundingResponse) Validate() error {
var err error
// No negative values
if c.ResponderFundingAmount < 0 {
return fmt.Errorf("ResponderFundingAmount cannot be negative")
}
if c.ResponderReserveAmount < 0 {
return fmt.Errorf("ResponderReserveAmount cannot be negative")
}
if c.MinFeePerKb < 0 {
return fmt.Errorf("MinFeePerKb cannot be negative")
}
// Validation of what makes sense...
if c.ResponderFundingAmount < c.ResponderReserveAmount {
return fmt.Errorf("Reserve must be below Funding Amount")
}
// Make sure there's not more than 127 inputs
if len(c.Inputs) > 127 {
return fmt.Errorf("Too many inputs")
}
// Delivery PkScript is either P2SH or P2PKH
err = ValidatePkScript(c.DeliveryPkScript)
if err != nil {
return err
}
// Change PkScript is either P2SH or P2PKH
err = ValidatePkScript(c.ChangePkScript)
if err != nil {
return err
}
// We're good!
return nil
}
func (c *FundingResponse) String() string {
var inputs string
for i, in := range c.Inputs {
inputs += fmt.Sprintf("\n Slice\t%d\n", i)
if &in != nil {
inputs += fmt.Sprintf("\tHash\t%s\n", in.PreviousOutPoint.Hash)
inputs += fmt.Sprintf("\tIndex\t%d\n", in.PreviousOutPoint.Index)
}
}
var serializedPubkey []byte
if &c.Pubkey != nil && c.Pubkey.X != nil {
serializedPubkey = c.Pubkey.SerializeCompressed()
}
return fmt.Sprintf("\n--- Begin FundingResponse ---\n") +
fmt.Sprintf("ChannelType:\t\t\t%x\n", c.ChannelType) +
fmt.Sprintf("ReservationID:\t\t\t%d\n", c.ReservationID) +
fmt.Sprintf("ResponderFundingAmount:\t\t%s\n", c.ResponderFundingAmount.String()) +
fmt.Sprintf("ResponderReserveAmount:\t\t%s\n", c.ResponderReserveAmount.String()) +
fmt.Sprintf("MinFeePerKb:\t\t\t%s\n", c.MinFeePerKb.String()) +
fmt.Sprintf("MinDepth:\t\t\t%d\n", c.MinDepth) +
fmt.Sprintf("LockTime\t\t\t%d\n", c.LockTime) +
fmt.Sprintf("FeePayer\t\t\t%x\n", c.FeePayer) +
fmt.Sprintf("RevocationHash\t\t\t%x\n", c.RevocationHash) +
fmt.Sprintf("Pubkey\t\t\t\t%x\n", serializedPubkey) +
fmt.Sprintf("CommitSig\t\t\t%x\n", c.CommitSig.Serialize()) +
fmt.Sprintf("DeliveryPkScript\t\t%x\n", c.DeliveryPkScript) +
fmt.Sprintf("ChangePkScript\t\t%x\n", c.ChangePkScript) +
fmt.Sprintf("Inputs:") +
inputs +
fmt.Sprintf("--- End FundingResponse ---\n")
}