If the `ChainMonitor` gets an async monitor update completion, this
means the `ChannelManager` needs to be polled for event processing.
Here we wake it using the new multi-`Future`-await `Sleeper`, or
the existing `select` block in the async BP.
Fixes#2052.
Rather than having three ways to await a `ChannelManager` being
persistable, this moves to just exposing the awaitable `Future` and
having sleep functions on that.
As `futures` apparently makes no guarantees on MSRVs even in patch
releases we really can't rely on it at all, and while it currently
has an acceptable MSRV without the macros feature, its best to just
remove it wholesale.
Luckily, removing it is relatively trivial, even if it requires
the most trivial of unsafe tags.
`futures` recently broke our MSRV by bumping the `syn` major
version in a patch release. This makes it impractical for us to
use, instead here we replace the usage of its `select_biased` macro
with a trivial enum.
Given its simplicity we likely should have done this without ever
taking the dependency.
This is largely motivated by some follow-up work for anchors that will
introduce an event handler for `BumpTransaction` events, which we can
now include in this new top-level `events` module.
`poll`ing completed futures invokes undefined behavior in Rust
(panics, etc, obviously not memory corruption as its not unsafe).
Sadly, in our futures-based version of
`lightning-background-processor` we have one case where we can
`poll` a completed future - if the timer for the network graph
prune + persist completes without a network graph to prune +
persist we'll happily poll the same future over and over again,
likely panicing in user code.
This field was previous useful in manual retries for users to know when all
paths of a payment have failed and it is safe to retry. Now that we support
automatic retries in ChannelManager and no longer support manual retries, the
field is no longer useful.
For backwards compat, we now always write false for this field. If we didn't do
this, previous versions would default this field's value to true, which can be
problematic because some clients have relied on the field to indicate when a
full payment retry is safe.
Forcing users to pass a genesis block hash has ended up being
error-prone largely due to byte-swapping questions for bindings
users. Further, our API is currently inconsistent - in
`ChannelManager` we take a `Bitcoin::Network` but in `NetworkGraph`
we take the genesis block hash.
Luckily `NetworkGraph` is the only remaining place where we require
users pass the genesis block hash, so swapping it for a `Network`
is a simple change.
The `chain::Access` trait (and the `chain::AccessError` enum) is a
bit strange - it only really makes sense if users import it via the
`chain` module, otherwise they're left with a trait just called
`Access`. Worse, for bindings users its always just called
`Access`, in part because many downstream languages don't have a
mechanism to import a module and then refer to it.
Further, its stuck dangling in the `chain` top-level mod.rs file,
sitting in a module that doesn't use it at all (it's only used in
`routing::gossip`).
Instead, we give it its full name - `UtxoLookup` (and rename the
error enum `UtxoLookupError`) and put it in the a new
`routing::utxo` module, next to `routing::gossip`.
Secrets should not be exposed in-memory at the interface level as it
would be impossible the implement it against a hardware security
module/secure element.
This makes `background-processor` build without `std` at all. This
isn't particularly useful in the general no-std case as
`background-processor` is only useful with the `futures` feature,
and async will generally need `std` in some way or another. Still,
it ensures we don't end up reintroducing a dependency on the
current time, which breaks `wasm` use-cases.
`background-processor` does a number of jobs on various timers.
Instead of doing those by interrogating `std::time::Instant`, this
change swaps to using the existing user-provided sleep future.
Fixes#1864.
`background-processor` does a number of jobs on various timers.
Currently, those are all done by checking the timers every 100ms
by interrogating `std::time::Instant`. This is fine for the
threaded version, but we'd like more flexibility in the `futures`-
based `background-processor`.
Here we swap the `std::time::Instant` interrogation for a lambda
which we will switch out to the user-provided sleeper in the next
commit.
As of HEAD the `ChannelManager` is parametrized by a `Router`, while
`InvoicePayer` also owns a `Router`. In order to allow for a single
object being reused, we make the `InvoicePayer` side `Deref`.
This is purely a refactor that does not change the InitFeatures
advertised by a ChannelManager. This allows users to configure which
features should be advertised based on the values of `UserConfig`. While
there aren't any existing features currently leveraging this behavior,
it will be used by the upcoming anchors_zero_fee_htlc_tx feature.
The UserConfig dependency on provided_init_features caused most
callsites of the main test methods responsible for opening channels to
be updated. This commit foregos that completely by no longer requiring
the InitFeatures of each side to be provided to these methods. The
methods already require a reference to each node's ChannelManager to
open the channel, so we use that same reference to obtain their
InitFeatures. A way to override such features was required for some
tests, so a new `override_init_features` config option now exists on
the test harness.
If no network graph is provided to the `BackgroundProcessor`, we
log every time the processor loop goes around (at least every
100ms, if not more) which fille up logs with useless indications
that we have no network graph.
