Matt Corallo [Fri, 5 Mar 2021 03:10:48 +0000 (22:10 -0500)]
Create new `InvoiceFeatures` object for Invoice-specific features
In the past we skipped doing this since invoice parsing occurs in a
different crate. However, we need to accept InvoiceFeatures in routing
now that we support MPP route collection, to detect if we can select
multiple paths or not. Further, we should probably take
rust-lightning-invoice as either a module or a subcrate in this repo.
Matt Corallo [Sun, 7 Mar 2021 18:00:11 +0000 (13:00 -0500)]
Make `get_outputs_to_watch` return a `Vec` instead of a `HashMap`
`get_outputs_to_watch` returned a reference to an existing
`HashMap` avoiding extra clones, but there isn't a huge reason to
do so now that we have to clone to copy it out of the
`ChannelMonitor` mutex. Instead, return a `Vec` since it may be
less memory and it allows us to have a bindings C mapping for the
function.
Co-authored-by: Jeffrey Czyz <jkczyz@gmail.com> Co-authored-by: Matt Corallo <git@bluematt.me>
Matt Corallo [Tue, 2 Mar 2021 15:25:37 +0000 (10:25 -0500)]
Make IgnoringMessageHandler and ErroringMessageHandler pub
This is largely useful for bindings, and the off-github discussion
around #814 concluded these should be pub, but the PR was not
updated to capture this. Now that the bindings support generation
for the structs, expose them.
Matt Corallo [Mon, 1 Mar 2021 22:07:29 +0000 (17:07 -0500)]
[bindings] Be explicit when calling pointer.is_null()
When the (somewhat anti-pattern)
`impl Deref for X { type Target = X; .. }` is used, this avoids an
infinite dereference exception trying to figure out what type to
resolve `is_null` against.
Matt Corallo [Fri, 26 Feb 2021 16:28:55 +0000 (11:28 -0500)]
Change ChannelManager::wait to be more descriptive
`wait` doesn't capture enough of what's going on, but also Java
Java doesn't accpet methods just called `wait`, as it conflicts
with existing sync primitives on all Objects.
Matt Corallo [Sun, 7 Mar 2021 17:58:14 +0000 (12:58 -0500)]
Add utility in `ChannelMonitor` to reload `chain::Filter` data
The deserialization process for `ChannelManager`/`ChannelMonitor`
data includes reloading any relevant `chain::Filter` with data
provided from the `ChannelMonitor`, but its nice if we adapt the
data to `chain::Filter` calls for users.
Jeffrey Czyz [Thu, 4 Mar 2021 02:33:54 +0000 (18:33 -0800)]
Correctly update the last block hash on disconnect
When a block is disconnected, the hash of the disconnected block was
used to update the last connected block. However, this amounts to a
no-op because these hashes should be equal. Successive disconnections
would update the hash but leave it one block off.
Normally, this not a problem because the last block_disconnected should
be followed by block_connected since the former is triggered by a chain
re-org. However, this assumes the user calls the API correctly and that
no failure occurs that would prevent block_connected from being called
(e.g., if fetching the connected block fails).
Instead, update the last block hash with the disconnected block's
previous block hash.
Jeffrey Czyz [Fri, 5 Mar 2021 20:37:50 +0000 (12:37 -0800)]
Hold ChannelManager locks independently
ChannelManager reads channel_state and last_block_hash while processing
funding_created and funding_signed messages. It writes these while
processing block_connected and block_disconnected events. To avoid any
potential deadlocks, have each site hold these locks independent of one
another and in a consistent order.
Additionally, use a RwLock instead of Mutex for last_block_hash since
exclusive access is not needed in funding_created / funding_signed and
cannot be guaranteed in block_connected / block_disconnected because of
the reads in the former.
Jeffrey Czyz [Fri, 5 Mar 2021 02:22:37 +0000 (18:22 -0800)]
Pass along ChannelManager's last_block_hash
ChannelMonitor keeps track of the last block connected. However, it is
initialized with the default block hash, which is a problem if the
ChannelMonitor is serialized before a block is connected. Instead, pass
ChannelManager's last_block_hash, which is initialized with a "birthday"
hash, when creating a new ChannelMonitor.
Jeffrey Czyz [Fri, 5 Mar 2021 01:39:21 +0000 (17:39 -0800)]
Remove last_block_connected from Channel
Tracking the last block was only used to de-duplicate block_connected
calls, but this is no longer required as of the previous commit.
Further, the ChannelManager can pass the latest block hash when needing
to create a ChannelMonitor rather than have each Channel maintain an
up-to-date copy. This is implemented in the next commit.
Jeffrey Czyz [Fri, 5 Mar 2021 00:58:26 +0000 (16:58 -0800)]
Remove block_connected de-duplication logic
Calling block_connected for the same block was necessary when clients
were expected to re-fetch filtered blocks with relevant transactions. At
the time, all listeners were notified of the connected block again for
re-scanning. Thus, de-duplication logic was put in place.
Jeffrey Czyz [Wed, 3 Mar 2021 19:24:55 +0000 (11:24 -0800)]
Parameterize ChannelManager::new with a block hash
When ChannelMonitors are persisted, they need to store the most recent
block hash seen. However, for newly created channels the default block
hash is used. If persisted before a block is connected, the funding
output may be missed when syncing after a restart. Instead, initialize
ChannelManager with a "birthday" hash so it can be used later when
creating channels.
Matt Corallo [Fri, 26 Feb 2021 17:02:11 +0000 (12:02 -0500)]
Process monitor update events in block_[dis]connected asynchronously
The instructions for `ChannelManagerReadArgs` indicate that you need
to connect blocks on a newly-deserialized `ChannelManager` in a
separate pass from the newly-deserialized `ChannelMontiors` as the
`ChannelManager` assumes the ability to update the monitors during
block [dis]connected events, saying that users need to:
```
4) Reconnect blocks on your ChannelMonitors
5) Move the ChannelMonitors into your local chain::Watch.
6) Disconnect/connect blocks on the ChannelManager.
```
This is fine for `ChannelManager`'s purpose, but is very awkward
for users. Notably, our new `lightning-block-sync` implemented
on-load reconnection in the most obvious (and performant) way -
connecting the blocks all at once, violating the
`ChannelManagerReadArgs` API.
Luckily, the events in question really don't need to be processed
with the same urgency as most channel monitor updates. The only two
monitor updates which can occur in block_[dis]connected is either
a) in block_connected, we identify a now-confirmed commitment
transaction, closing one of our channels, or
b) in block_disconnected, the funding transaction is reorganized
out of the chain, making our channel no longer funded.
In the case of (a), sending a monitor update which broadcasts a
conflicting holder commitment transaction is far from
time-critical, though we should still ensure we do it. In the case
of (b), we should try to broadcast our holder commitment transaction
when we can, but within a few minutes is fine on the scale of
block mining anyway.
Note that in both cases cannot simply move the logic to
ChannelMonitor::block[dis]_connected, as this could result in us
broadcasting a commitment transaction from ChannelMonitor, then
revoking the now-broadcasted state, and only then receiving the
block_[dis]connected event in the ChannelManager.
Thus, we move both events into an internal invent queue and process
them in timer_chan_freshness_every_min().
Matt Corallo [Fri, 26 Feb 2021 02:55:30 +0000 (21:55 -0500)]
Change ShutdownResult type to better capture the possibilites
The return value from Channel::force_shutdown previously always
returned a `ChannelMonitorUpdate`, but expected it to only be
applied in the case that it *also* returned a Some for the funding
transaction output.
This is confusing, instead we move the `ChannelMontiorUpdate`
inside the Option, making it hold a tuple instead.
Matt Corallo [Sun, 7 Feb 2021 23:06:58 +0000 (18:06 -0500)]
Move functional tests involving reorgs to reorg_test
functional_tests.rs is huge, so anything we can do to split it up
some is helpful. This also exposes a somewhat glaring lack of
reorgs in our existing tests.
Gleb Naumenko [Mon, 1 Mar 2021 10:37:51 +0000 (12:37 +0200)]
Don't underpay htlc_min due to path contribution
We could have possibly constructed a slightly inconsistent
path: since we reduce value being transferred all the way, we
could have violated htlc_minimum_msat on some channels
we already passed (assuming dest->source direction). Here,
we recompute the fees again, so that if that's the case, we
match the currently underpaid htlc_minimum_msat with fees.
Change ChannelManager deserialization to return an optional blockhash
If the ChannelManager never receives any blocks, it'll return a default blockhash
on deserialization. It's preferable for this to be an Option instead.
Jeffrey Czyz [Tue, 2 Mar 2021 18:03:11 +0000 (10:03 -0800)]
Add validate_best_block_header utility
Refactor synchronize_listeners by pulling out a function returning the
validated block header of a BlockSource's best chain tip. This is needed
when a node is started from scratch and has no listeners to sync.
Jeffrey Czyz [Mon, 1 Mar 2021 06:39:01 +0000 (22:39 -0800)]
Implement chain::Listen without using RefCell
The implementation of chain::Listen for ChannelMonitor required using a
RefCell since its block_connected method required a mutable borrow. This
is no longer the case since ChannelMonitor now uses interior mutability
via a Mutex. So the RefCell is no longer needed.
Jeffrey Czyz [Mon, 1 Mar 2021 06:26:41 +0000 (22:26 -0800)]
Change Mutex to RwLock in ChainMonitor
Now that ChannelMonitor uses an internal Mutex to support interior
mutability, ChainMonitor can use a RwLock to manage its ChannelMonitor
map. This allows parallelization of update_channel operations since an
exclusive lock only needs to be held when adding to the map in
watch_channel.
Jeffrey Czyz [Mon, 1 Mar 2021 05:42:27 +0000 (21:42 -0800)]
Move ChannelMonitor state behind a Mutex
ChainMonitor accesses a set of ChannelMonitors behind a single Mutex.
As a result, update_channel operations cannot be parallelized. It also
requires using a RefCell around a ChannelMonitor when implementing
chain::Listen.
Moving the Mutex into ChannelMonitor avoids these problems and aligns it
better with other interfaces. Note, however, that get_funding_txo and
get_outputs_to_watch now clone the underlying data rather than returning
references.
Matt Corallo [Mon, 1 Mar 2021 20:10:59 +0000 (15:10 -0500)]
Provide Dummy routing and channel message handlers for users
We currently "support" not having a router or channel in memory by
forcing users to implement the same, but its trivial to provide our
own dummy implementations.
Matt Corallo [Sat, 9 Jan 2021 02:55:47 +0000 (21:55 -0500)]
[bindings] Build a wasm32-wasi library in genbindings.sh
This will switch to use the clang/C WASM ABI instead of the
wasm_bindgen WASM ABI as of rustc 1.51 (or nightly since [1]),
allowing us to link C and Rust code in a single wasm binary.
Matt Corallo [Fri, 26 Feb 2021 23:16:14 +0000 (18:16 -0500)]
[bindings] Be explicit when calling trait methods in generated code
For ChannelManager, at least, we have two separate functions called
block_connected, one in the Listen trait, one in the struct, we
need to be explicit with which one we're trying to call.
Jeffrey Czyz [Fri, 5 Feb 2021 03:20:03 +0000 (19:20 -0800)]
Utility for syncing a set of chain listeners
Add a utility for syncing a set of chain listeners to a common chain
tip. Required to use before creating an SpvClient when the chain
listener used with the client is actually a set of listeners each of
which may have had left off at a different block. This would occur when
the listeners had been persisted individually at different frequencies
(e.g., a ChainMonitor's individual ChannelMonitors).
Jeffrey Czyz [Thu, 4 Feb 2021 01:41:03 +0000 (17:41 -0800)]
Add SpvClient used to poll for the best chain tip
Adds a lightweight client for polling one or more block sources for the
best chain tip. Notifies listeners of blocks connected or disconnected
since the last poll. Useful for keeping a Lightning node in sync with
the chain.
Jeffrey Czyz [Mon, 1 Feb 2021 21:17:20 +0000 (13:17 -0800)]
Add ChainNotifier and define ChainListener trait
Add an interface for being notified of block connected and disconnected
events, along with a notifier for generating such events. Used while
polling block sources for a new tip in order to feed these events into
ChannelManager and ChainMonitor.