lnd/docs/release-notes/release-notes-0.17.0.md

Release Notes

DB

• Split channeldb UpdateInvoice implementation logic in different update types.

• Add invoice SQL schema and queries

Watchtowers

• Let the task pipeline only carry wtdb.BackupIDs instead of the entire retribution struct. This reduces the amount of data that needs to be held in memory.

• Replace in-mem task pipeline with a disk-overflow queue

• Replay pending and un-acked updates onto the main task pipeline if a tower is being removed

• Add defaults to the wtclient and watchtower config structs and use these to populate the defaults of the main LND config struct so that the defaults appear in the lnd --help command output.

• The deprecated "wtclient.private-tower-uris" option has also been removed. This field was deprecated in v0.8.0-beta.

Misc

• Ensure that both the byte and string form of a TXID is populated in the lnrpc.Outpoint message.

• Fix Benchmark Test (BenchmarkReadMessage/Channel_Ready) in the lnwire package

• Fix unit test flake (TestLightningWallet) in the neutrino package via version bump of btcsuite/btcwallet

• HTLC serialization updated to allow storing extra data transmitted in TLVs.

• MaxLocalCSVDelay now has a default value of 2016. It is still possible to override this value with the config option --maxlocaldelay for those who rely on the old value of 10000.

RPC

• SendOutputs now adheres to the anchor channel reserve requirement.

• Enforce provided fee rate is no less than the relay or minimum mempool fee when calling OpenChannel, CloseChannel, SendCoins, and SendMany.

• The UpdateNodeAnnouncement API can no longer be used to set/unset protocol features that are defined by LND.

• Neutrinorpc getblockhash has been deprecated. Endpoint has been moved to the chainrpc sub-server.

  Custom node announcement feature bits can also be specified in config using the dev build tag and --protocol.custom-nodeann, --protocol.custom-init and --protocol.custom-invoice flags to set feature bits for various feature "sets", as defined in BOLT 9.

• OpenChannel now accepts an optional memo argument for specifying a helpful note-to-self containing arbitrary useful information about the channel.

• PendingOpenChannel now has the field funding_expiry_blocks that indicates the number of blocks until the funding transaction is considered expired.

• gRPC keepalive parameters can now be set in the configuration. The lnd configuration settings grpc.server-ping-time and grpc.server-ping-timeout configure how often lnd pings its clients and how long a pong response is allowed to take. The default values for there settings are improved over the gRPC protocol internal default values, so most users won't need to change those. The grpc.client-ping-min-wait setting defines how often a client is allowed to ping lnd to check for connection healthiness. The lnd default value of 5 seconds is much lower than the previously used protocol internal value, which means clients can now check connection health more often. For this to be activated on the client side, gRPC clients are encouraged to set the keepalive setting on their end as well (using the grpc.keepalive_time_ms option in JavaScript or Python, or the equivalent setting in the gRPC library they are using, might be an environment variable or a different syntax depending on the programming language used) when creating long open streams over a network topology that might silently fail connections. A value of grpc.keepalive_time_ms=5100 is recommended on the client side (adding 100ms to account for slightly different clock speeds).

• Fixed a bug where we didn't check for correct networks when submitting onchain transactions.

• Fix non-deterministic behaviour in RPC calls for custom accounts. In theory, it should be only one custom account with a given name. However, due to a lack of check, users could have created custom accounts with various key scopes. The non-deterministic behaviours linked to this case are fixed, and users can no longer create two custom accounts with the same name.

• OpenChannel adds a new utxo flag that allows the specification of multiple UTXOs as a basis for funding a channel opening.

Misc

• Generate default macaroons independently on wallet unlock or create.

• Restore support for PKCS8-encoded cert private keys.

• Add --unused to lncli newaddr command.

Code Health

• Updated our fork for serializing protobuf as JSON to be based on the latest version of google.golang.org/protobuf instead of the deprecated github.com/golang/protobuf/jsonpb module.

Testing

• Started running fuzz tests in CI.

• Derandomized the BOLT 8 fuzz tests.

• Improved invoice fuzz tests.

• Added fuzz tests for signature parsing and conversion.

• Added a fuzz test for watchtower address iterators.

• Simplify fuzz tests using the require package.

lncli

• Added ability to use ENV variables to override lncli global flags. Flags will have preference over ENVs.

• The lncli sendcoins command now asks for manual confirmation when invoked on the command line. This can be skipped by adding the --force (or -f) flag, similar to how lncli payinvoice works. To not break any existing scripts the confirmation is also skipped if stdout is not a terminal/tty (e.g. when capturing the output in a shell script variable or piping the output to another program).

Bug Fix

• Make sure payment stream returns all the events by subscribing it before sending.

• Fixed a memory leak found in mempool management handled by btcwallet.

• Updated bbolt to v1.3.7 in order to address mmap issues affecting certain older iPhone devices.

• Stop rejecting payments that overpay or over-timelock the final hop

• Fix let's encrypt autocert generation

• Fix an issue where IPv6 couldn't be dialed when using Tor, even when tor.skip-proxy-for-clearnet-targets=true was set.

Tooling and documentation

• Add support for custom RPCHOST and RPCCRTPATH to the lnd Docker image main script (/start-lnd.sh).

• Fix bug in scripts/verify-install.sh that caused the release binary signature verification script to not properly import signing keys when being run with new version of gpg (which is the case in the latest Docker image).

Contributors (Alphabetical Order)

• Aljaz Ceru
• BhhagBoseDK
• Carla Kirk-Cohen
• Daniel McNally
• Elle Mouton
• Erik Arvstedt
• ErikEk
• gabbyprecious
• Guillermo Caracuel
• Hampus Sjöberg
• hieblmi
• Jordi Montes
• Keagan McClelland
• Konstantin Nick
• Lele Calo
• Matt Morehouse
• Maxwell Sayles
• Michael Street
• MG-ng
• Oliver Gugger
• Pierre Beugnet
• Satarupa Deb
• Shaurya Arora
• Torkel Rogstad
• Yong Yu
• ziggie1984
• zx9r