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Messages for funding flow.

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This is the most different due to segwit (the rest of the messages are
simple).

I still need to simplify/refactor the tests, they're "messy".
This commit is contained in:
Joseph Poon
2015-12-30 05:38:57 -08:00
parent a5f0d3e56e
commit a93b6dcee4
12 changed files with 986 additions and 71 deletions
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54
lnwire/funding_request.go
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@@ -1,7 +1,6 @@
package lnwire
import (
"bytes"
"fmt"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/wire"
@@ -19,7 +18,7 @@ type FundingRequest struct {
//Should double-check the total funding later
MinTotalFundingAmount btcutil.Amount
//CLTV lock-time to use
//CLTV/CSV lock-time to use
LockTime uint32
//Who pays the fees
@@ -31,14 +30,13 @@ type FundingRequest struct {
RevocationHash [20]byte
Pubkey *btcec.PublicKey
DeliveryPkScript PkScript //*MUST* be either P2PKH or P2SH
//FIXME: Need a ChangePkScript PkScript for dual-funder CLTV?
ChangePkScript PkScript //*MUST* be either P2PKH or P2SH
Inputs []*wire.TxIn
}
func (c *FundingRequest) Decode(r io.Reader, pver uint32) error {
//Channel Type (0/1)
// default to 0 for CLTV-only
//Funding Amount (1/8)
//Channel Minimum Capacity (9/8)
//Revocation Hash (17/20)
@@ -47,7 +45,9 @@ func (c *FundingRequest) Decode(r io.Reader, pver uint32) error {
//Minimum Transaction Fee Per Kb (77/8)
//LockTime (85/4)
//FeePayer (89/1)
//DeliveryPkScript
//DeliveryPkScript (final delivery)
// First byte length then pkscript
//ChangePkScript (change for extra from inputs)
// First byte length then pkscript
//Inputs: Create the TxIns
// First byte is number of inputs
@@ -63,12 +63,13 @@ func (c *FundingRequest) Decode(r io.Reader, pver uint32) error {
&c.LockTime,
&c.FeePayer,
&c.DeliveryPkScript,
&c.ChangePkScript,
&c.Inputs)
if err != nil {
return err
}
return c.Validate()
return nil
}
//Creates a new FundingRequest
@@ -89,6 +90,7 @@ func (c *FundingRequest) Encode(w io.Writer, pver uint32) error {
//LockTime
//FeePayer
//DeliveryPkScript
//ChangePkScript
//Inputs: Append the actual Txins
err := writeElements(w, false,
c.ChannelType,
@@ -101,6 +103,7 @@ func (c *FundingRequest) Encode(w io.Writer, pver uint32) error {
c.LockTime,
c.FeePayer,
c.DeliveryPkScript,
c.ChangePkScript,
c.Inputs)
if err != nil {
return err
@@ -114,13 +117,14 @@ func (c *FundingRequest) Command() uint32 {
}
func (c *FundingRequest) MaxPayloadLength(uint32) uint32 {
//90 (base size) + 26 (pkscript) + 1 (numTxes) + 127*36(127 inputs * sha256+idx)
//4690
return 4689
//90 (base size) + 26 (pkscript) + 26 (pkscript) + 1 (numTxes) + 127*36(127 inputs * sha256+idx)
return 4715
}
//Makes sure the struct data is valid (e.g. no negatives or invalid pkscripts)
func (c *FundingRequest) Validate() error {
var err error
//No negative values
if c.FundingAmount < 0 {
return fmt.Errorf("FundingAmount cannot be negative")
@@ -137,28 +141,16 @@ func (c *FundingRequest) Validate() error {
return fmt.Errorf("MinTotalFundingAmount cannot be negative")
}
//PkScript is either P2SH or P2PKH
if len(c.DeliveryPkScript) == 25 {
//P2PKH
//Begins with OP_DUP OP_HASH160 PUSHDATA(20)
if !bytes.Equal(c.DeliveryPkScript[0:3], []byte{118, 169, 20}) &&
//Ends with OP_EQUALVERIFY OP_CHECKSIG
!bytes.Equal(c.DeliveryPkScript[23:25], []byte{136, 172}) {
//If it's not correct, return error
return fmt.Errorf("PkScript only allows P2SH or P2PKH")
}
} else if len(c.DeliveryPkScript) == 23 {
//P2SH
//Begins with OP_HASH160 PUSHDATA(20)
if !bytes.Equal(c.DeliveryPkScript[0:2], []byte{169, 20}) &&
//Ends with OP_EQUAL
!bytes.Equal(c.DeliveryPkScript[22:23], []byte{135}) {
//If it's not correct, return error
return fmt.Errorf("PkScript only allows P2SH or P2PKH")
}
} else {
//Length not 23 or 25
return fmt.Errorf("PkScript only allows P2SH or P2PKH")
//DeliveryPkScript is either P2SH or P2PKH
err = ValidatePkScript(c.DeliveryPkScript)
if err != nil {
return err
}
//ChangePkScript is either P2SH or P2PKH
err = ValidatePkScript(c.ChangePkScript)
if err != nil {
return err
}
//We're good!