127 lines
3.1 KiB
Go
127 lines
3.1 KiB
Go
package lnwire
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import (
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"fmt"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcutil"
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"io"
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)
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// Multiple Clearing Requests are possible by putting this inside an array of
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// clearing requests
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type CommitSignature struct {
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// We can use a different data type for this if necessary...
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ChannelID uint64
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// Height of the commitment
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// You should have the most recent commitment height stored locally
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// This should be validated!
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// This is used for shachain.
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// Each party increments their own CommitmentHeight, they can differ for
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// each part of the Commitment.
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//FIXME This might be superfluous
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CommitmentHeight uint64
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// List of HTLC Keys which are updated from all parties
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//UpdatedHTLCKeys []uint64
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LastCommittedKeyAlice HTLCKey
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LastCommittedKeyBob HTLCKey
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// Hash of the revocation to use
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RevocationHash [20]byte
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// Total miners' fee that was used
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Fee btcutil.Amount
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// Signature for the new Commitment
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CommitSig *btcec.Signature // Requester's Commitment
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}
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func (c *CommitSignature) Decode(r io.Reader, pver uint32) error {
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// ChannelID(8)
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// CommitmentHeight(8)
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// RevocationHash(20)
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// Fee(8)
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// RequesterCommitSig(73max+2)
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err := readElements(r,
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&c.ChannelID,
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&c.CommitmentHeight,
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&c.LastCommittedKeyAlice,
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&c.LastCommittedKeyBob,
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&c.RevocationHash,
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&c.Fee,
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&c.CommitSig,
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)
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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 CommitSignature
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func NewCommitSignature() *CommitSignature {
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return &CommitSignature{}
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}
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// Serializes the item from the CommitSignature struct
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// Writes the data to w
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func (c *CommitSignature) Encode(w io.Writer, pver uint32) error {
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err := writeElements(w,
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c.ChannelID,
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c.CommitmentHeight,
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c.LastCommittedKeyAlice,
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c.LastCommittedKeyBob,
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c.RevocationHash,
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c.Fee,
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c.CommitSig,
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)
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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 *CommitSignature) Command() uint32 {
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return CmdCommitSignature
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}
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func (c *CommitSignature) MaxPayloadLength(uint32) uint32 {
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return 8192
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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 *CommitSignature) Validate() error {
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if c.Fee < 0 {
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// While fees can be negative, it's too confusing to allow
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// negative payments. Maybe for some wallets, but not this one!
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return fmt.Errorf("Amount paid cannot be negative.")
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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 *CommitSignature) String() string {
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// c.ChannelID,
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// c.CommitmentHeight,
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// c.RevocationHash,
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// c.UpdatedHTLCKeys,
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// c.Fee,
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// c.CommitSig,
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var serializedSig []byte
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if c.CommitSig != nil && c.CommitSig.R != nil {
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serializedSig = c.CommitSig.Serialize()
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}
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return fmt.Sprintf("\n--- Begin CommitSignature ---\n") +
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fmt.Sprintf("ChannelID:\t\t%d\n", c.ChannelID) +
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fmt.Sprintf("CommitmentHeight:\t%d\n", c.CommitmentHeight) +
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fmt.Sprintf("LastCommittedKeyAlice:\t%d\n", c.LastCommittedKeyAlice) +
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fmt.Sprintf("LastCommittedKeyBob:\t%d\n", c.LastCommittedKeyBob) +
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fmt.Sprintf("RevocationHash:\t\t%x\n", c.RevocationHash) +
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fmt.Sprintf("Fee:\t\t\t%s\n", c.Fee.String()) +
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fmt.Sprintf("CommitSig:\t\t%x\n", serializedSig) +
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fmt.Sprintf("--- End CommitSignature ---\n")
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}
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