Implement option_simple_close
#2747
Draft
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
Codecov ReportAttention: Patch coverage is
❗ Your organization needs to install the Codecov GitHub app to enable full functionality. Additional details and impacted files@@ Coverage Diff @@
## master #2747 +/- ##
==========================================
- Coverage 86.30% 86.18% -0.13%
==========================================
Files 224 224
Lines 19867 20326 +459
Branches 795 805 +10
==========================================
+ Hits 17147 17517 +370
- Misses 2720 2809 +89
|
24 tasks
t-bast
force-pushed
the
option-simple-close
branch
2 times, most recently
from
77023c5
to
db7a79d
Compare
t-bast
force-pushed
the
option-simple-close
branch
2 times, most recently
from
a223c78
to
e05d16e
Compare
t-bast
force-pushed
the
option-simple-close
branch
from
e05d16e
to
57ae172
Compare
t-bast
force-pushed
the
option-simple-close
branch
from
3b6879b
to
4420858
Compare
t-bast
force-pushed
the
option-simple-close
branch
from
4420858
to
7fda599
Compare
t-bast
force-pushed
the
option-simple-close
branch
3 times, most recently
from
f8b957d
to
f0571b2
Compare
t-bast
force-pushed
the
option-simple-close
branch
from
f0571b2
to
623b371
Compare
This feature adds two new messages: - `closing_complete` sent after exchanging `shutdown` - `closing_sig` sent in response to `closing_complete`
The spec allows the closer to use an OP_RETURN output if their amount is too low when using `option_simple_close`.
We introduce a new `NEGOTIATING_SIMPLE` state where we exchange the `closing_complete` and `closing_sig` messages, and allow RBF-ing previous transactions and updating our closing script. We stay in that state until one of the transactions confirms, or a force close is detected. This is important to ensure we're able to correctly reconnect and negotiate RBF candidates. We keep this separate from the previous NEGOTIATING state to make it easier to remove support for the older mutual close protocols once we're confident the network has been upgraded.
Whenever one side sends `shutdown`, we restart a signing round from scratch. To be compatible with future taproot channels, we require the receiver to also send `shutdown` before moving on to exchanging `closing_complete` and `closing_sig`. This will give nodes a message to exchange fresh musig2 nonces before producing signatures. On reconnection, we also restart a signing session from scratch and discard pending partial signatures.
t-bast
force-pushed
the
option-simple-close
branch
from
36ff0c3
to
3708ab9
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Implement
option_simple_closeas defined in lightning/bolts#1096Hopefully this is the last time we change the mutual close protocol! And at some point that will let us entirely remove all the code supporting the two previous mutual close protocols (this is why I kept the code as separate as possible instead of trying to fit into the existing
NEGOTIATINGstate).Note that this is a prerequisite for taproot channels: this protocol allows nodes to safely exchange nonces in
shutdownandclosing_completeto spend a musig2 channel output.