fcff17c336
This commit will allow the general public to build lnd without jumping through hoops setting up their local git branches nicely with all of our forks.
238 lines
6.4 KiB
Go
238 lines
6.4 KiB
Go
package lnwire
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import (
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"fmt"
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"github.com/roasbeef/btcd/btcec"
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"github.com/roasbeef/btcd/wire"
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"github.com/roasbeef/btcutil"
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"io"
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)
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type FundingRequest struct {
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ReservationID uint64
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ChannelType uint8
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RequesterFundingAmount btcutil.Amount
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RequesterReserveAmount btcutil.Amount
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MinFeePerKb btcutil.Amount
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// The funding requester can request payment
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// This wallet only allows positive values,
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// which is a payment to the responder
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// (This can be used to fund the Reserve)
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// If the responder disagrees, then the funding request fails
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// THIS VALUE GOES INTO THE RESPONDER'S FUNDING AMOUNT
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// total requester input value = RequesterFundingAmount + PaymentAmount + "Total Change" + Fees(?)
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// RequesterFundingAmount = "Available Balance" + RequesterReserveAmount
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// Payment SHOULD NOT be acknowledged until the minimum confirmation has elapsed
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// (Due to double-spend risks the recipient will not want to acknolwedge confirmation until later)
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// This is to make a payment as part of opening the channel
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PaymentAmount btcutil.Amount
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// Minimum number of confirmations to validate transaction
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MinDepth uint32
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// Should double-check the total funding later
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MinTotalFundingAmount btcutil.Amount
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// CLTV/CSV lock-time to use
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LockTime uint32
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// Who pays the fees
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// 0: (default) channel initiator
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// 1: split
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// 2: channel responder
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FeePayer uint8
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RevocationHash [20]byte
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Pubkey *btcec.PublicKey
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DeliveryPkScript PkScript // *MUST* be either P2PKH or P2SH
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ChangePkScript PkScript // *MUST* be either P2PKH or P2SH
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Inputs []*wire.TxIn
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}
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func (c *FundingRequest) Decode(r io.Reader, pver uint32) error {
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// Reservation ID (8)
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// Channel Type (1)
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// Funding Amount (8)
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// Channel Minimum Capacity (8)
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// Revocation Hash (20)
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// Commitment Pubkey (32)
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// Reserve Amount (8)
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// Minimum Transaction Fee Per Kb (8)
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// PaymentAmount (8)
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// MinDepth (4)
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// LockTime (4)
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// FeePayer (1)
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// DeliveryPkScript (final delivery)
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// First byte length then pkscript
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// ChangePkScript (change for extra from inputs)
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// First byte length then pkscript
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// Inputs: Create the TxIns
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// First byte is number of inputs
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// For each input, it's 32bytes txin & 4bytes index
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err := readElements(r,
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&c.ReservationID,
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&c.ChannelType,
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&c.RequesterFundingAmount,
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&c.MinTotalFundingAmount,
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&c.RevocationHash,
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&c.Pubkey,
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&c.RequesterReserveAmount,
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&c.MinFeePerKb,
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&c.PaymentAmount,
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&c.MinDepth,
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&c.LockTime,
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&c.FeePayer,
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&c.DeliveryPkScript,
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&c.ChangePkScript,
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&c.Inputs)
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if err != nil {
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return err
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}
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return nil
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}
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// Creates a new FundingRequest
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func NewFundingRequest() *FundingRequest {
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return &FundingRequest{}
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}
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// Serializes the item from the FundingRequest struct
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// Writes the data to w
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func (c *FundingRequest) Encode(w io.Writer, pver uint32) error {
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// Channel Type
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// Funding Amont
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// Channel Minimum Capacity
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// Revocation Hash
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// Commitment Pubkey
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// Reserve Amount
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// Minimum Transaction Fee Per KB
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// LockTime
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// FeePayer
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// DeliveryPkScript
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// ChangePkScript
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// Inputs: Append the actual Txins
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err := writeElements(w,
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c.ReservationID,
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c.ChannelType,
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c.RequesterFundingAmount,
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c.MinTotalFundingAmount,
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c.RevocationHash,
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c.Pubkey,
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c.RequesterReserveAmount,
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c.MinFeePerKb,
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c.PaymentAmount,
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c.MinDepth,
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c.LockTime,
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c.FeePayer,
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c.DeliveryPkScript,
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c.ChangePkScript,
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c.Inputs)
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if err != nil {
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return err
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}
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return nil
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}
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func (c *FundingRequest) Command() uint32 {
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return CmdFundingRequest
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}
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func (c *FundingRequest) MaxPayloadLength(uint32) uint32 {
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// 110 (base size) + 26 (pkscript) + 26 (pkscript) + 1 (numTxes) + 127*36(127 inputs * sha256+idx)
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return 4735
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}
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// Makes sure the struct data is valid (e.g. no negatives or invalid pkscripts)
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func (c *FundingRequest) Validate() error {
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var err error
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// No negative values
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if c.RequesterFundingAmount < 0 {
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return fmt.Errorf("RequesterFundingAmount cannot be negative")
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}
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if c.RequesterReserveAmount < 0 {
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return fmt.Errorf("RequesterReserveAmount cannot be negative")
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}
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if c.MinFeePerKb < 0 {
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return fmt.Errorf("MinFeePerKb cannot be negative")
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}
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if c.MinTotalFundingAmount < 0 {
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return fmt.Errorf("MinTotalFundingAmount cannot be negative")
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}
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// Validation of what makes sense...
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if c.MinTotalFundingAmount < c.RequesterFundingAmount {
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return fmt.Errorf("Requester's minimum too low.")
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}
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if c.RequesterFundingAmount < c.RequesterReserveAmount {
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return fmt.Errorf("Reserve must be below Funding Amount")
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}
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// This wallet only allows payment from the requester to responder
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if c.PaymentAmount < 0 {
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return fmt.Errorf("This wallet requieres payment to be greater than zero.")
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}
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// Make sure there's not more than 127 inputs
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if len(c.Inputs) > 127 {
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return fmt.Errorf("Too many inputs")
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}
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// DeliveryPkScript is either P2SH or P2PKH
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err = ValidatePkScript(c.DeliveryPkScript)
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if err != nil {
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return err
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}
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// ChangePkScript is either P2SH or P2PKH
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err = ValidatePkScript(c.ChangePkScript)
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if err != nil {
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return err
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}
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// We're good!
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return nil
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}
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func (c *FundingRequest) String() string {
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var inputs string
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for i, in := range c.Inputs {
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inputs += fmt.Sprintf("\n Slice\t%d\n", i)
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if &in != nil {
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inputs += fmt.Sprintf("\tHash\t%s\n", in.PreviousOutPoint.Hash)
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inputs += fmt.Sprintf("\tIndex\t%d\n", in.PreviousOutPoint.Index)
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}
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}
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var serializedPubkey []byte
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if &c.Pubkey != nil && c.Pubkey.X != nil {
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serializedPubkey = c.Pubkey.SerializeCompressed()
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}
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return fmt.Sprintf("\n--- Begin FundingRequest ---\n") +
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fmt.Sprintf("ReservationID:\t\t\t%d\n", c.ReservationID) +
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fmt.Sprintf("ChannelType:\t\t\t%x\n", c.ChannelType) +
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fmt.Sprintf("RequesterFundingAmount:\t\t%s\n", c.RequesterFundingAmount.String()) +
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fmt.Sprintf("RequesterReserveAmount:\t\t%s\n", c.RequesterReserveAmount.String()) +
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fmt.Sprintf("MinFeePerKb:\t\t\t%s\n", c.MinFeePerKb.String()) +
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fmt.Sprintf("PaymentAmount:\t\t\t%s\n", c.PaymentAmount.String()) +
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fmt.Sprintf("MinDepth:\t\t\t%d\n", c.MinDepth) +
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fmt.Sprintf("MinTotalFundingAmount\t\t%s\n", c.MinTotalFundingAmount.String()) +
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fmt.Sprintf("LockTime\t\t\t%d\n", c.LockTime) +
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fmt.Sprintf("FeePayer\t\t\t%x\n", c.FeePayer) +
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fmt.Sprintf("RevocationHash\t\t\t%x\n", c.RevocationHash) +
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fmt.Sprintf("Pubkey\t\t\t\t%x\n", serializedPubkey) +
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fmt.Sprintf("DeliveryPkScript\t\t%x\n", c.DeliveryPkScript) +
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fmt.Sprintf("Inputs:") +
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inputs +
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fmt.Sprintf("--- End FundingRequest ---\n")
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}
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