107 lines
3.3 KiB
Go
107 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 vulernable to a resource exhasution attack wherein the a 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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// SpvProof is an merkle proof of the inclusion of the funding
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// transaction within a block.
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// TODO(roasbeef): spec out format for SPV proof, only of single tx so
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// can be compact
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SpvProof []byte
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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, spvProof []byte) *SingleFundingOpenProof {
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return &SingleFundingOpenProof{
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ChannelID: chanID,
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SpvProof: spvProof,
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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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// SpvProof (?)
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err := readElements(r,
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&s.ChannelID,
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&s.SpvProof)
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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.SpvProof)
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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 FundingSignComplete ---\n") +
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fmt.Sprintf("ChannelID:\t\t%d\n", s.ChannelID) +
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fmt.Sprintf("SpvProof\t\t%s\n", s.SpvProof) +
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fmt.Sprintf("--- End FundingSignComplete ---\n")
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}
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