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server+funding: allow scid-alias, zero-conf chantypes, scid-alias

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feature-bit channels

This allows opening zero-conf chan-type, scid-alias chan-type, and
scid-alias feature-bit channels. scid-alias chan-type channels are
required to be private. Two paths are available for opening a zero-conf
channel:

* explicit chan-type negotiation
* LDK carve-out where chan-types are not used, LND is on the
  receiving end, and a ChannelAcceptor is used to enable zero-conf

When a zero-conf channel is negotiated, the funding manager:
* sends a FundingLocked with an alias
* waits for a FundingLocked from the remote peer
* calls addToRouterGraph to persist the channel using our alias in
  the graph. The peer's alias is used to send them a ChannelUpdate.
* wait for six confirmations. If public, the alias edge in the
  graph is deleted and replaced (not atomically) with the confirmed
  edge. Our policy is also read-and-replaced, but the counterparty's
  policy won't exist until they send it to us.

When a scid-alias-feature channel is negotiated, the funding manager:
* sends a FundingLocked with an alias:
* calls addToRouterGraph, sends ChannelUpdate with the confirmed SCID
  since it exists.
* when six confirmations occurs, the edge is deleted and re-inserted
  since the peer may have sent us an alias ChannelUpdate that we are
  storing in the graph.

Since it is possible for a user to toggle the scid-alias-feature-bit
to on while channels exist in the funding manager, care has been taken
to ensure that an alias is ALWAYS sent in the funding_locked message
if this happens.
This commit is contained in:
eugene
2022-04-04 16:47:05 -04:00
parent 13c15e8038
commit 1aa9626606
19 changed files with 3883 additions and 2697 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
chanacceptor/acceptor_test.go
View File

@@ -184,13 +184,15 @@ func TestMultipleAcceptClients(t *testing.T) {
queries = map[*lnwire.OpenChannel]*ChannelAcceptResponse{
chan1: NewChannelAcceptResponse(
true, nil, testUpfront, 1, 2, 3, 4, 5, 6,
false,
),
chan2: NewChannelAcceptResponse(
false, errChannelRejected, nil, 0, 0, 0,
0, 0, 0,
0, 0, 0, false,
),
chan3: NewChannelAcceptResponse(
false, customError, nil, 0, 0, 0, 0, 0, 0,
false,
),
}
@@ -245,7 +247,7 @@ func TestInvalidResponse(t *testing.T) {
PendingChannelID: chan1,
}: NewChannelAcceptResponse(
false, errChannelRejected, nil, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0, false,
),
}
@@ -288,7 +290,7 @@ func TestInvalidReserve(t *testing.T) {
DustLimit: dustLimit,
}: NewChannelAcceptResponse(
false, errChannelRejected, nil, 0, 0,
0, reserve, 0, 0,
0, reserve, 0, 0, false,
),
}