* Channels larger than 16777215 sats (Wumbo!) are now supported and can be
enabled for inbound channels using
`ChannelHandshakeLimits::max_funding_satoshis` (#1425).
* Support for feature `option_zeroconf`, allowing immediate forwarding of
payments after channel opening. This is configured for outbound channels
using `ChannelHandshakeLimits::trust_own_funding_0conf` whereas
`ChannelManager::accept_inbound_channel_from_trusted_peer_0conf` has to be
used for accepting inbound channels (#1401, #1505).
* `ChannelManager::claim_funds` no longer returns a `bool` to indicate success.
Instead, an `Event::PaymentClaimed` is generated if the claim was successful.
Likewise, `ChannelManager::fail_htlc_backwards` no longer has a return value
(#1434).
* `lightning-rapid-gossip-sync` is a new crate for syncing gossip data from a
server, primarily aimed at mobile devices (#1155).
* `RapidGossipSync` can be passed to `BackgroundProcessor` in order to persist
the `NetworkGraph` and handle `NetworkUpdate`s during event handling (#1433,
#1517).
* `NetGraphMsgHandler` has been renamed to `P2PGossipSync`, the `network_graph`
module has been renamed to `gossip`, and `NetworkUpdate::ChannelClosed` has
been renamed `NetworkUpdate::ChannelFailure` (#1159).
* Added a `filtered_block_connected` method to `chain::Listen` and a default
implementation of `block_connected` for those fetching filtered instead of
full blocks (#1453).
* The `lightning-block-sync` crate's `BlockSource` trait methods now take
`&self` instead of `&mut self` (#1307).
* `inbound_payment` module is now public to allow for creating invoices without
a `ChannelManager` (#1384).
* `lightning-block-sync`'s `init` and `poll` modules support `&dyn BlockSource`
which can be determined at runtime (#1423).
* `lightning-invoice` crate's `utils` now accept an expiration time (#1422,
#1474).
* `Event::PaymentForwarded` includes `prev_channel_id` and `next_channel_id`
(#1419, #1475).
* `chain::Watch::release_pending_monitor_events`' return type now associates
`MonitorEvent`s with funding `OutPoints` (#1475).
* `lightning-background-processor` crate's `Persister` trait has been moved to
`lightning` crate's `util::persist` module, which now has a general
`KVStorePersister` trait. Blanket implementations of `Persister` and
`chainmonitor::Persist` are given for types implementing `KVStorePersister`.
` lightning-persister`'s `FilesystemPersister` implements `KVStorePersister`
(#1417).
* `ChannelDetails` and `ChannelCounterparty` include fields for HTLC minimum
and maximum values (#1378).
* Added a `max_inbound_htlc_value_in_flight_percent_of_channel` field to
`ChannelHandshakeConfig`, capping the total value of outstanding inbound
HTLCs for a channel (#1444).
* `ProbabilisticScorer` is parameterized by a `Logger`, which it uses to log
channel liquidity updates or lack thereof (#1405).
* `ChannelDetails` has an `outbound_htlc_limit_msat` field, which should be
used in routing instead of `outbound_capacity_msat` (#1435).
* `ProbabilisticScorer`'s channel liquidities can be logged via
`debug_log_liquidity_stats` (#1460).
* `BackgroundProcessor` now takes an optional `WriteableScore` which it will
persist using the `Persister` trait's new `persist_scorer` method (#1416).
* Upgraded to `bitcoin` crate version 0.28.1 (#1389).
* `ShutdownScript::new_witness_program` now takes a `WitnessVersion` instead of
a `NonZeroU8` (#1389).
* Channels will no longer be automatically force closed when the counterparty
is disconnected due to incompatibility (#1429).
* `ChannelManager` methods for funding, accepting, and closing channels now
take a `counterparty_node_id` parameter, which has also been added as a field
to `Event::FundingGenerationReady` (#1479, #1485).
* `InvoicePayer::new` now takes a `Retry` enum (replacing the `RetryAttempts`
struct), which supports both attempt- and timeout-based retrying (#1418).
* `Score::channel_penalty_msat` takes a `ChannelUsage` struct, which contains
the capacity as an `EffectiveCapacity` enum and any potential in-flight HTLC
value, rather than a single `u64`. Used by `ProbabilisticScorer` for more
accurate penalties (#1456).
* `build_route_from_hops` is a new function useful for constructing a `Route`
given a specific list of public keys (#1491).
* `FundingLocked` message has been renamed `ChannelReady`, and related
identifiers have been renamed accordingly (#1506).
* `core2::io` or `std::io` (depending on feature flags `no-std` or `std`) is
exported as a `lightning::io` module (#1504).
* The deprecated `Scorer` has been removed in favor or `ProbabilisticScorer`
(#1512).
Performance Improvements
========================
* `lightning-persister` crate's `FilesystemPersister` is faster by 15x (#1404).
* Log gossip query messages at `GOSSIP` instead of `TRACE` to avoid
overwhelming default logging (#1421).
* `PeerManager` supports processing messages from different peers in parallel,
and this is taken advantage of in gossip processing (#1023).
* Greatly reduced per-channel and per-node memory usage due to upgrade of
`secp256k1` crate to 0.22.1 and `bitcoin` crate to 0.28.1
* Reduced per-peer memory usage in `PeerManager` (#1472).
Spec Compliance
===============
* `find_route` now assumes variable-length onions by default for nodes where
support for the feature is unknown (#1414).
* A `warn` message is now sent when receiving a `channel_reestablish` with an
old commitment transaction number rather than immediately force-closing the
channel (#1430).
* When a `channel_update` message is included in an onion error's `failuremsg`,
its message type is now encoded. Reading such messages is also supported
(#1465).
Bug Fixes
=========
* Fixed a bug where crashing while persisting a `ChannelMonitorUpdate` for a
part of a multi-path payment could cause loss of funds due to a partial
payment claim on restart (#1434).
* `BackgroundProcessor` has been fixed to improve serialization reliability on
slow systems which can avoid force-closes (#1436).
* `gossip_timestamp_filter` filters are now honored when sending gossip to
peers (#1452).
* During a reorg, only force-close a channel if its funding transaction is
unconfirmed rather than as it loses confirmations (#1461).
* Fixed a rare panic in `lightning-net-tokio` when fetching a peer's socket
address after the connection has been closed caused by a race condition
(#1449).
* `find_route` will no longer return routes that would cause onion construction
to fail in some cases (#1476).
* `ProbabilisticScorer` uses more precision when approximating `log10` (#1406).
* All above new events/fields are ignored by prior clients. All above new
events/fields are not present when reading objects serialized by prior
versions of the library.
* `ChannelManager` serialization is no longer compatible with versions prior to
0.0.99 (#1401).
* Channels with `option_zeroconf` feature enabled (not required for 0-conf
channel use) will be unreadable by versions prior to 0.0.107 (#1401, #1505).
In total, this release features 96 files changed, 9304 insertions, 4503
deletions in 153 commits from 18 authors, in alphabetical order:
* Arik Sosman
* Devrandom
* Duncan Dean
* Elias Rohrer
* Jeffrey Czyz
* John Cantrell
* John Corser
* Jurvis Tan
* Justin Moon
* KaFai Choi
* Mateusz Faltyn
* Matt Corallo
* Valentine Wallace
* Viktor Tigerström
* Vincenzo Palazzo
* atalw
* dependabot[bot]
* shamardy
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projects / rust-lightning / tag