98471256fa
This commit modifies the SingleFundingOpen message to include the compact channel ID of the finalized transaction rather than a “fake” SPV proof. This change is a stop-gap which allows us to implement portions of BOLT07 without yet fully implementing all parts of BOLT[02, 03].
106 lines
3.3 KiB
Go
106 lines
3.3 KiB
Go
package lnwire
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import (
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"fmt"
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"io"
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)
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// SingleFundingOpenProof is the message sent by the channel initiator to the
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// responder after the previously constructed funding transaction has achieved
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// a sufficient number of confirmations. It is the initiator's duty to present
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// a proof of an open channel to the responder. Otherwise, responding node may
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// be vulnerable to a resource exhaustion attack wherein the requesting node
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// repeatedly negotiates funding transactions which are never broadcast. If the
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// responding node commits resources to watch the chain for each funding
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// transaction, then this attack is very cheap for the initiator.
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type SingleFundingOpenProof struct {
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// ChannelID serves to uniquely identify the future channel created by
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// the initiated single funder workflow.
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ChannelID uint64
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// ChanChainID is the channel ID of the completed channel which
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// compactly encodes the location of the channel within the current
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// main chain.
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ChanChainID ChannelID
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}
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// NewSingleFundingSignComplete creates a new empty SingleFundingOpenProof
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// message.
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func NewSingleFundingOpenProof(chanID uint64, chainID ChannelID) *SingleFundingOpenProof {
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return &SingleFundingOpenProof{
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ChannelID: chanID,
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ChanChainID: chainID,
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}
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}
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// Decode deserializes the serialized SingleFundingOpenProof stored in the
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// passed io.Reader into the target SingleFundingOpenProof using the
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// deserialization rules defined by the passed protocol version.
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//
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// This is part of the lnwire.Message interface.
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func (s *SingleFundingOpenProof) Decode(r io.Reader, pver uint32) error {
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// ChannelID (8)
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// ChanChainID (8)
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err := readElements(r,
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&s.ChannelID,
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&s.ChanChainID)
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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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// Encode serializes the target SingleFundingOpenProof into the passed
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// io.Writer implementation. Serialization will observe the rules defined by
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// the passed protocol version.
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//
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// This is part of the lnwire.Message interface.
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func (s *SingleFundingOpenProof) Encode(w io.Writer, pver uint32) error {
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err := writeElements(w,
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s.ChannelID,
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s.ChanChainID)
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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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// Command returns the uint32 code which uniquely identifies this message as a
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// SingleFundingSignComplete on the wire.
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//
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// This is part of the lnwire.Message interface.
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func (s *SingleFundingOpenProof) Command() uint32 {
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return CmdSingleFundingOpenProof
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}
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// MaxPayloadLength returns the maximum allowed payload length for a
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// SingleFundingComplete. This is calculated by summing the max length of all
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// the fields within a SingleFundingOpenProof.
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//
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// This is part of the lnwire.Message interface.
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func (s *SingleFundingOpenProof) MaxPayloadLength(uint32) uint32 {
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// 8 +
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return 81
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}
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// Validate examines each populated field within the SingleFundingOpenProof for
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// field sanity.
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//
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// This is part of the lnwire.Message interface.
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func (s *SingleFundingOpenProof) Validate() error {
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// We're good!
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return nil
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}
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// String returns the string representation of the SingleFundingOpenProof.
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//
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// This is part of the lnwire.Message interface.
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func (s *SingleFundingOpenProof) String() string {
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return fmt.Sprintf("\n--- Begin SingleFundingOpenProof ---\n") +
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fmt.Sprintf("ChannelID:\t\t%d\n", s.ChannelID) +
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fmt.Sprintf("ChanChainID\t\t%s\n", s.ChanChainID.ToUint64()) +
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fmt.Sprintf("--- End SingleFundingOpenProof ---\n")
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}
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