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lnwire: channels are now identified by outpoint

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This commit modifies most of the wire messages to uniquely identify any
*active* channels by their funding output. This allows the wire
protocol to support funding transactions which open several channels in
parallel.

Any pending channels created by partial completion of the funding
workflow are to be identified by a uint64 initialized by both sides as
follows: the initiator of the connection starts from 0, while the
listening node starts from (1 << 63). These pending channel identifiers
are expected to be monotonically increasing with each new funding
workflow between two nodes. This identifier is volatile w.r.t to each
connection initiation.
This commit is contained in:
Olaoluwa Osuntokun
2016-06-20 21:55:07 -07:00
parent 7b7d572984
commit 6c7880ef76
25 changed files with 236 additions and 202 deletions
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17
lnwire/commit_signature.go
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@@ -5,6 +5,7 @@ import (
"io"
"github.com/roasbeef/btcd/btcec"
"github.com/roasbeef/btcd/wire"
"github.com/roasbeef/btcutil"
)
@@ -16,9 +17,9 @@ import (
// messages in order to batch add several HTLC's with a single signature
// covering all implicitly accepted HTLC's.
type CommitSignature struct {
// ChannelID uniquely identifies to which currently active channel this
// ChannelPoint uniquely identifies to which currently active channel this
// CommitSignature applies to.
ChannelID uint64
ChannelPoint *wire.OutPoint
// Fee represents the total miner's fee that was used when constructing
// the new commitment transaction.
@@ -47,11 +48,11 @@ var _ Message = (*CommitSignature)(nil)
//
// This is part of the lnwire.Message interface.
func (c *CommitSignature) Decode(r io.Reader, pver uint32) error {
// ChannelID(8)
// ChannelPoint(8)
// Fee(8)
// RequesterCommitSig(73max+2)
err := readElements(r,
&c.ChannelID,
&c.ChannelPoint,
&c.Fee,
&c.CommitSig,
)
@@ -69,7 +70,7 @@ func (c *CommitSignature) Decode(r io.Reader, pver uint32) error {
func (c *CommitSignature) Encode(w io.Writer, pver uint32) error {
// TODO(roasbeef): make similar modificaiton to all other encode/decode
// messags
return writeElements(w, c.ChannelID, c.Fee, c.CommitSig)
return writeElements(w, c.ChannelPoint, c.Fee, c.CommitSig)
}
// Command returns the integer uniquely identifying this message type on the
@@ -85,8 +86,8 @@ func (c *CommitSignature) Command() uint32 {
//
// This is part of the lnwire.Message interface.
func (c *CommitSignature) MaxPayloadLength(uint32) uint32 {
// 8 + 8 + 73
return 89
// 36 + 8 + 73
return 117
}
// Validate performs any necessary sanity checks to ensure all fields present
@@ -114,7 +115,7 @@ func (c *CommitSignature) String() string {
}
return fmt.Sprintf("\n--- Begin CommitSignature ---\n") +
fmt.Sprintf("ChannelID:\t%d\n", c.ChannelID) +
fmt.Sprintf("ChannelPoint:\t%d\n", c.ChannelPoint) +
fmt.Sprintf("Fee:\t\t\t%s\n", c.Fee.String()) +
fmt.Sprintf("CommitSig:\t\t%x\n", serializedSig) +
fmt.Sprintf("--- End CommitSignature ---\n")