f3849f5c10
* Structs and wire messages for HTLCs * Wire protocol for a state machine with no blocking(!!!) (I will write the state machine) TL;DR: Can do multiple HTLC modifications in-flight, dead simple wire protocol. Both sides can update their Commitments unliaterally without waiting for the other party's signature. Will have basic/preliminary notes in the README * Added **swp to .gitignore because of vim annoyances
131 lines
3.2 KiB
Go
131 lines
3.2 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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CommitmentHeight uint64
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//The last staging included by both parties
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//Basically, the state is updated to this point on both parties'
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//staging
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//Staging inclusion is in order.
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CommitterLastStaging uint64
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ReceiverLastStaging uint64
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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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//CommiterLastStaging(8)
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//ReceiverLastStaging(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.CommitterLastStaging,
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&c.ReceiverLastStaging,
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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.CommitterLastStaging,
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c.ReceiverLastStaging,
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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 135
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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.CommitterLastStaging,
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//c.ReceiverLastStaging,
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//c.RevocationHash,
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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("CommitterLastStaging:\t%d\n", c.CommitterLastStaging) +
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fmt.Sprintf("ReceiverLastStaging:\t%d\n", c.ReceiverLastStaging) +
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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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