lnd/docs/release-notes/release-notes-0.16.0.md

Release Notes

BOLT Specs

• Warning messages from peers are now recognized and logged by lnd.

RPC

• The RegisterConfirmationsNtfn call of the chainnotifier RPC sub-server now optionally supports returning the entire block that confirmed the transaction.

• Add macaroon_root_key field to InitWalletRequest to allow specifying a root key for macaroons during wallet init rather than having lnd randomly generate one for you.

• A new SignedInputs field is added to SignPsbtResponse that returns the indices of inputs that were signed by our wallet. Prior to this change SignPsbt didn't indicate whether the Psbt held any inputs for our wallet to sign.

• Add list addresses RPC.

• Add TrackPayments method to the RPC to allow subscribing to updates from any inflight payment. Similar to TrackPaymentV2, but for any inflight payment.

• Catch and throw an error during openchannel if the local funding amount given is zero.

• Extend the HTLC interceptor server implementation with watchdog functionality to cancel back HTLCs for which an interceptor client does not provide a resolution in time. If an HTLC expires, the counterparty will claim it back on-chain and the receiver will lose it. Therefore the receiver can just as well fail off-chain a few blocks before so that the channel is saved.

• Make remote channel reserve amount configurable for openchannel

• ForwardingHistory now enriches each forwarding event with inbound and outbound peer alias names if the new flag PeerAliasLookup in ForwardingHistoryRequest is set to true. lncli fwdinghistory enables this feature by default but adds a new flag skip_peer_alias_lookup to skip the lookup.

• The graph lookups method DescribeGraph, GetNodeInfo and GetChanInfo now expose tlv data that is broadcast over the gossip network.

• Add new HTLC notifier event and lookup RPC for the final settlement of incoming HTLCs. This allows applications to wait for the HTLC to actually disappear from all valid commitment transactions, rather than assume that it will. With the new extensions, situations can be avoided where the application considers an HTLC settled, but in reality the HTLC has timed out.

  Final resolution data will only be available for htlcs that are resolved after upgrading lnd.

• Zero-amount private invoices now provide hop hints, up to maxHopHints (20 currently).

Wallet

• Allows Taproot public keys and tap scripts to be imported as watch-only addresses into the internal wallet. NOTE that funding PSBTs from imported tap scripts is not currently possible.

• The wallet birthday is now used properly when creating a watch-only wallet to avoid scanning the whole chain.

Build

The project has updated to Go 1.19! Go 1.18 is now the minimum version needed to build the project.

The minimum recommended version of the Go 1.19.x series is 1.19.2 because 1.19.1 contained a bug that affected lnd and resulted in a crash.

Use Go's runtime/debug package to get information about the build

A wire parsing bug has been fixed that would cause lnd to be unable decode certain large transactions.

Misc

• Fixed a bug where the Switch did not reforward settles or fails for waiting-close channels

• Fixed a flake in the TestChannelLinkCancelFullCommitment unit test.

• Fixed error typo.

• The macaroon key store implementation was refactored to be more generally usable.

• Fixed a bug where cookie authentication with Tor would fail if the cookie path contained spaces. With the module updated, lnd now parses Tor control port messages correctly.

• Add option to encrypt Tor private key, and update the Tor module to pave the way for this functionality.

• Fixed potential data race on funding manager restart.

• Fixed a flake in the TestBlockCacheMutexes unit test.

• Create a helper function to wait for peer to come online.

• Stop handling peer warning messages as errors

• Stop sending a synchronizing error on the wire when out of sync.

• Update cert module to allow a way to update the tls certificate without restarting lnd.

• Fixed a bug where paying an invoice with a malformed route hint triggers a never-ending retry loop

• Migrated from go-fuzz to Go 1.18's new standard fuzz testing library. Updated build and documentation to reflect this.

• Added missing wire tests for Warning message.

lncli

• Add an insecure flag to skip tls auth as well as a metadata string slice flag that allows the caller to specify key-value string pairs that should be appended to the outgoing context.

• Fix command line argument parsing for lncli sendpayment.

• Fix mapslice cap out of range error that occurs if the number of profiles is zero.

• A new config option, batchwindowduration has been added to sweeper to allow customize sweeper batch duration.

• Add base_fee_msat and fee_rate_ppm flags to openchannel requests so that the user can specify fees during channel creation time in addition to the default configuration.

• Sleep for 10ms when funding locked message is not received to avoid CPU spike.

• A new config option, mailboxdeliverytimeout has been added to htlcswitch.

• Label the openchannel tx first before notifying the channel open event.

Code Health

• test: use T.TempDir to create temporary test directory

• The tlv package now allows decoding records larger than 65535 bytes. The caller is expected to know that doing so with untrusted input is unsafe.

• test: replace defer cleanup with t.Cleanup.

• test: fix loop variables being accessed in closures.

Watchtowers

• Create a towerID-to-sessionID index in the wtclient DB to improve the speed of listing sessions for a particular tower ID. This PR also ensures a closer coupling of Towers and Sessions and ensures that a session cannot be added if the tower it is referring to does not exist.

• Remove AckedUpdates & CommittedUpdates from the ClientSession struct in order to improve the performance of fetching a ClientSession from the DB.

• Allow user to update tower address without requiring a restart. Also allow the removal of a tower address if the current session negotiation is not using the address in question

Tooling and documentation

• The golangci-lint tool was updated to v1.46.2

• Tests in htlcswitch will now clean up the temporary resources they create.

• Updated the github actions to use make fmt-check in its build process.

• Database related code was refactored to allow external tools to use it more easily, in preparation for adding a data migration functionality to lndinit.

• golangci-lint will now check new code using additional linters.

• Update github actions to check commits against the target base branch rather than just using the master branch. And skip the commit check for all non-PR events.

Integration test

The lntest has been refactored to provide a better testing suite for writing integration tests. A new defined structure is implemented, please refer to README for more details. Along the way, several PRs(6776) have been made to refactor the itest for code health and maintenance.

Contributors (Alphabetical Order)

• Alejandro Pedraza
• andreihod
• Carla Kirk-Cohen
• Conner Babinchak
• cutiful
• Daniel McNally
• Elle Mouton
• ErikEk
• Eugene Siegel
• Graham Krizek
• hieblmi
• Jesse de Wit
• Joost Jager
• Jordi Montes
• lsunsi
• Matt Morehouse
• Michael Street
• Jordi Montes
• Olaoluwa Osuntokun
• Oliver Gugger
• Priyansh Rastogi
• Roei Erez
• Yong Yu