f51a5a6458
Running "go test -v" will show the serialization and deserialization. Doing the rest of the wire stuff should be *much* faster since I figured everything out...
430 lines
8.7 KiB
Go
430 lines
8.7 KiB
Go
package lnwire
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"github.com/btcsuite/btcd/btcec"
|
|
"github.com/btcsuite/btcd/wire"
|
|
"github.com/btcsuite/btcutil"
|
|
"io"
|
|
"io/ioutil"
|
|
)
|
|
|
|
//Actual pkScript, not redeemScript
|
|
type PkScript []byte
|
|
|
|
//Subsatoshi amount
|
|
type MicroSatoshi int32
|
|
|
|
type CreateChannel struct {
|
|
ChannelType uint8
|
|
|
|
FundingAmount btcutil.Amount
|
|
ReserveAmount btcutil.Amount
|
|
MinFeePerKb btcutil.Amount
|
|
|
|
//Should double-check the total funding later
|
|
MinTotalFundingAmount btcutil.Amount
|
|
|
|
//CLTV 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
|
|
DeliveryPkScript PkScript //*MUST* be either P2PKH or P2SH
|
|
|
|
Inputs []*wire.TxIn
|
|
}
|
|
|
|
func (c *CreateChannel) String() string {
|
|
|
|
var inputs string
|
|
for i, in := range c.Inputs {
|
|
inputs += fmt.Sprintf("\n Slice\t%d\n", i)
|
|
inputs += fmt.Sprintf("\tHash\t%s\n", in.PreviousOutPoint.Hash)
|
|
inputs += fmt.Sprintf("\tIndex\t%d\n", in.PreviousOutPoint.Index)
|
|
}
|
|
return fmt.Sprintf("\n--- Begin CreateChannel ---\n") +
|
|
fmt.Sprintf("ChannelType:\t\t%x\n", c.ChannelType) +
|
|
fmt.Sprintf("FundingAmount:\t\t%s\n", c.FundingAmount.String()) +
|
|
fmt.Sprintf("ReserveAmount:\t\t%s\n", c.ReserveAmount.String()) +
|
|
fmt.Sprintf("MinFeePerKb:\t\t%s\n", c.MinFeePerKb.String()) +
|
|
fmt.Sprintf("MinTotalFundingAmount\t%s\n", c.MinTotalFundingAmount.String()) +
|
|
fmt.Sprintf("LockTime\t\t%d\n", c.LockTime) +
|
|
fmt.Sprintf("FeePayer\t\t%x\n", c.FeePayer) +
|
|
fmt.Sprintf("RevocationHash\t\t%x\n", c.RevocationHash) +
|
|
fmt.Sprintf("Pubkey\t\t\t%x\n", c.Pubkey.SerializeCompressed()) +
|
|
fmt.Sprintf("DeliveryPkScript\t%x\n", c.DeliveryPkScript) +
|
|
fmt.Sprintf("Inputs:") +
|
|
inputs +
|
|
fmt.Sprintf("--- End CreateChannel ---\n")
|
|
}
|
|
|
|
//Writes the big endian representation of element
|
|
//Unified function to call when writing different types
|
|
//Pre-allocate a byte-array of the correct size for cargo-cult security
|
|
//More copies but whatever...
|
|
func writeElement(w io.Writer, element interface{}) error {
|
|
var err error
|
|
switch e := element.(type) {
|
|
case uint8:
|
|
var b [1]byte
|
|
b[0] = byte(e)
|
|
_, err = w.Write(b[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case uint32:
|
|
var b [4]byte
|
|
binary.BigEndian.PutUint32(b[:], uint32(e))
|
|
_, err = w.Write(b[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case btcutil.Amount:
|
|
err = binary.Write(w, binary.BigEndian, int64(e))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case *btcec.PublicKey:
|
|
var b [33]byte
|
|
serializedPubkey := e.SerializeCompressed()
|
|
if len(serializedPubkey) != 33 {
|
|
return fmt.Errorf("Wrong size pubkey")
|
|
}
|
|
copy(b[:], serializedPubkey)
|
|
_, err = w.Write(b[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case [20]byte:
|
|
_, err = w.Write(e[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case PkScript:
|
|
scriptLength := len(e)
|
|
//Make sure it's P2PKH or P2SH size or less
|
|
if scriptLength > 25 {
|
|
return fmt.Errorf("PkScript too long!")
|
|
}
|
|
//Write the size (1-byte)
|
|
err = binary.Write(w, binary.BigEndian, uint8(scriptLength))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
//Write the data
|
|
_, err = w.Write(e)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case []*wire.TxIn:
|
|
//Append the unsigned(!!!) txins
|
|
//Write the size (1-byte)
|
|
if len(e) > 127 {
|
|
return fmt.Errorf("Too many txins")
|
|
}
|
|
err = binary.Write(w, binary.BigEndian, uint8(len(e)))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
//Append the actual TxIns (Size: NumOfTxins * 36)
|
|
//Do not include the sequence number to eliminate funny business
|
|
for _, in := range e {
|
|
//Hash
|
|
var h [32]byte
|
|
copy(h[:], in.PreviousOutPoint.Hash.Bytes())
|
|
_, err = w.Write(h[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
//Index
|
|
var idx [4]byte
|
|
binary.BigEndian.PutUint32(idx[:], in.PreviousOutPoint.Index)
|
|
_, err = w.Write(idx[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
default:
|
|
return fmt.Errorf("Unknown type in writeElement: %T", e)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func readElement(r io.Reader, element interface{}) error {
|
|
var err error
|
|
switch e := element.(type) {
|
|
case *uint8:
|
|
var b [1]uint8
|
|
_, err = r.Read(b[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
*e = b[0]
|
|
case *uint32:
|
|
var b [4]byte
|
|
_, err = io.ReadFull(r, b[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
*e = binary.BigEndian.Uint32(b[:])
|
|
case *btcutil.Amount:
|
|
var b [8]byte
|
|
_, err = io.ReadFull(r, b[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
*e = btcutil.Amount(int64(binary.BigEndian.Uint64(b[:])))
|
|
case **btcec.PublicKey:
|
|
var b [33]byte
|
|
_, err = io.ReadFull(r, b[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
x, err := btcec.ParsePubKey(b[:], btcec.S256())
|
|
*e = &*x
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case *[20]byte:
|
|
_, err = io.ReadFull(r, e[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case *PkScript:
|
|
//Get the script length first
|
|
var scriptLength [1]uint8
|
|
_, err = r.Read(scriptLength[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if scriptLength[0] > 25 {
|
|
return fmt.Errorf("PkScript too long!")
|
|
}
|
|
|
|
//Read the script length
|
|
l := io.LimitReader(r, int64(scriptLength[0]))
|
|
*e, _ = ioutil.ReadAll(l)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
case *[]*wire.TxIn:
|
|
//Read the size (1-byte number of txins)
|
|
var numScripts [1]uint8
|
|
_, err = r.Read(numScripts[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if numScripts[0] > 127 {
|
|
return fmt.Errorf("Too many txins")
|
|
}
|
|
|
|
//Append the actual TxIns
|
|
var txins []*wire.TxIn
|
|
for i := uint8(0); i < numScripts[0]; i++ {
|
|
//Hash
|
|
var h [32]byte
|
|
_, err = io.ReadFull(r, h[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
shaHash, err := wire.NewShaHash(h[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
//Index
|
|
var idxBytes [4]byte
|
|
_, err = io.ReadFull(r, idxBytes[:])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
index := binary.BigEndian.Uint32(idxBytes[:])
|
|
outPoint := wire.NewOutPoint(shaHash, index)
|
|
|
|
//Create TxIn
|
|
txins = append(txins, wire.NewTxIn(outPoint, nil))
|
|
}
|
|
*e = *&txins
|
|
|
|
default:
|
|
return fmt.Errorf("Unknown type in readElement: %T", e)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *CreateChannel) DeserializeFundingRequest(r io.Reader) error {
|
|
var err error
|
|
|
|
//Message Type (0/1)
|
|
var messageType uint8
|
|
err = readElement(r, &messageType)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if messageType != 0x30 {
|
|
return fmt.Errorf("Message type does not match FundingRequest")
|
|
}
|
|
|
|
//Channel Type (1/1)
|
|
err = readElement(r, &c.ChannelType)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Funding Amount (2/8)
|
|
err = readElement(r, &c.FundingAmount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Channel Minimum Capacity (10/8)
|
|
err = readElement(r, &c.MinTotalFundingAmount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Revocation Hash (18/20)
|
|
err = readElement(r, &c.RevocationHash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Commitment Pubkey (38/32)
|
|
err = readElement(r, &c.Pubkey)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Reserve Amount (70/8)
|
|
err = readElement(r, &c.ReserveAmount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//Minimum Transaction Fee Per Kb (78/8)
|
|
err = readElement(r, &c.MinFeePerKb)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//LockTime (86/4)
|
|
err = readElement(r, &c.LockTime)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//FeePayer (90/1)
|
|
err = readElement(r, &c.FeePayer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Delivery PkScript
|
|
err = readElement(r, &c.DeliveryPkScript)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//Create the TxIns
|
|
err = readElement(r, &c.Inputs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
//Serializes the fundingRequest from the CreateChannel struct
|
|
//Writes the data to w
|
|
func (c *CreateChannel) SerializeFundingRequest(w io.Writer) error {
|
|
var err error
|
|
|
|
//Fund request byte
|
|
err = writeElement(w, uint8(0x30))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//Channel Type
|
|
//default to 0 for CLTV-only
|
|
err = writeElement(w, c.ChannelType)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//Funding Amont
|
|
err = writeElement(w, c.FundingAmount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Channel Minimum Capacity
|
|
err = writeElement(w, c.MinTotalFundingAmount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Revocation Hash
|
|
err = writeElement(w, c.RevocationHash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Commitment Pubkey
|
|
err = writeElement(w, c.Pubkey)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Reserve Amount
|
|
err = writeElement(w, c.ReserveAmount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//Minimum Transaction Fee Per KB
|
|
err = writeElement(w, c.MinFeePerKb)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//LockTime
|
|
err = writeElement(w, c.LockTime)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//FeePayer
|
|
err = writeElement(w, c.FeePayer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Delivery PkScript
|
|
//First byte length then pkscript
|
|
err = writeElement(w, c.DeliveryPkScript)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
//Append the actual Txins
|
|
//First byte is number of inputs
|
|
//For each input, it's 32bytes txin & 4bytes index
|
|
err = writeElement(w, c.Inputs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|