We never had the `NetworkGraph::node_failed` method implemented. The
scorer now handles non-permanent failures by downgrading nodes, so we
don't want that implemented.
The method is renamed to `node_failed_permanent` to explicitly indicate
that this is the only case it handles. We also add tracking in the form
of two maps as fields of `NetworkGraph`, namely, `removed_nodes` and
`removed_channels`. We track these removed graph entries to ensure we
don't just resync them right away from gossip soon after removing them.
We stop tracking these removed nodes whenever `remove_stale_channels_and_tracking()`
is called and the entries have been tracked for longer than
`REMOVED_ENTRIES_TRACKING_AGE_LIMIT_SECS` which is currently set to one
week.
We do this to enable users to create routers that do not need a scorer.
This can be useful if they are running a node the delegates pathfinding.
* Move `Score` type parameterization from `InvoicePayer` and `Router` to
`DefaultRouter`
* Adds a new field, `scorer`, to `DefaultRouter`
* Move `AccountsForInFlightHtlcs` to `DefaultRouter`, which we
will use to wrap the new `scorer` field, so scoring only happens in
`DefaultRouter` explicitly.
* Add scoring related functions to `Router` trait that we used to call
directly from `InvoicePayer`.
* Instead of parameterizing `scorer` in `find_route`, we replace it with
inflight_map so `InvoicePayer` can pass on information about inflight
HTLCs to the router.
* Introduced a new tuple struct, InFlightHtlcs, that wraps functionality
for querying used liquidity.
As we move towards specify supported/required feature bits in the
module(s) where they are supported, the global `known` feature set
constructors no longer make sense.
Here we stop relying on the `known` method in the
`lightning-background-processor` and `lightning-persister` crate
tests.
Some `NodeFeatures` will, in the future, represent features which
are not enabled by the `ChannelManager`, but by other message
handlers handlers. Thus, it doesn't make sense to determine the
node feature bits in the `ChannelManager`.
The simplest fix for this is to change to generating the
node_announcement in `PeerManager`, asking all the connected
handlers which feature bits they support and simply OR'ing them
together. While this may not be sufficient in the future as it
doesn't consider feature bit dependencies, support for those could
be handled at the feature level in the future.
This commit moves the `broadcast_node_announcement` function to
`PeerHandler` but does not yet implement feature OR'ing.
Adds the boilerplate needed for PeerManager and OnionMessenger to work
together, with some corresponding docs and misc updates mostly due to the
PeerManager public API changing.
If a user restores from a backup that they know is stale, they'd
like to force-close all of their channels (or at least the ones
they know are stale) *without* broadcasting the latest state,
asking their peers to do so instead. This simply adds methods to do
so, renaming the existing `force_close_channel` and
`force_close_all_channels` methods to disambiguate further.
BackgroundProcessor can take an optional P2PGossipSync and an optional
RapidGossipSync, but doing so may be easy to misuse. Each has a
reference to a NetworkGraph, which could be different between the two,
but only one is actually used.
Instead, allow passing one object wrapped in a GossipSync enum. Also,
fix a bug where the NetworkGraph is not persisted on shutdown if only a
RapidGossipSync is given.
Instead of implementing EventHandler for P2PGossipSync, implement it on
NetworkGraph. This allows RapidGossipSync to handle events, too, by
delegating to its NetworkGraph.
P2PGossipSync logs before delegating to NetworkGraph in its
EventHandler. In order to share this handling with RapidGossipSync,
NetworkGraph needs to take a logger so that it can implement
EventHandler instead.
NetGraphMsgHandler implements RoutingMessageHandler to handle gossip
messages defined in BOLT 7 and maintains a view of the network by
updating NetworkGraph. Rename it to P2PGossipSync, which better
describes its purpose, and to contrast with RapidGossipSync.
Create a wrapper struct for rapid gossip sync that can be passed to
BackgroundProcessor's start method, allowing it to only start pruning
the network graph upon rapid gossip sync's completion.
The main loop of the background processor has this line:
`peer_manager.process_events(); // Note that this may block on ChannelManager's locking`
which does, indeed, sometimes block waiting on the `ChannelManager`
to finish whatever its doing. Specifically, its the only place in
the background processor loop that we block waiting on the
`ChannelManager`, so if the `ChannelManager` is relatively busy, we
may end up being blocked there most of the time.
This should be fine, except today we had a user who's node was
particularly slow in processing some channel updates, resulting in
the background processor being blocked there (as expected). Then,
when the channel updates were completed (and persisted) the next
thing the background processor did was hand the user events to
process, creating yet more channel updates. Ultimately, the users'
node crashed before finishing the event processing. This left us
with an updated monitor on disk and an outdated manager, and they
lost the channel on startup.
Here we simply move the above quoted line to after the normal event
processing, ensuring the next thing we do after blocking on
`ChannelManager` locks is persist the manager, prior to event
handling.
