Matt Corallo [Wed, 18 Sep 2024 18:03:11 +0000 (18:03 +0000)]
Only attempt to `rustfmt` files checked into git
This avoids `rustfmt` failing on Rust files generated by dependent
crates in `target`, eg
```
+ rustfmt --edition 2021 --check ./target/debug/build/thiserror-8230374e07b5c05a/out/probe.rs
Diff in /home/matt/rust-lightning-3/target/debug/build/thiserror-8230374e07b5c05a/out/probe.rs at line 1:
Elias Rohrer [Wed, 4 Sep 2024 09:10:13 +0000 (11:10 +0200)]
Check workspace members with default features individually in CI
Previously, we would only check the workspace as a whole. This however
would mean that we would check/test crates with `lightning`'s default
features enabled, allowing failures-to-build under the crates own
default features to slip through, if they didn't explicitly enable
`lightning/std`, for example.
Here, we extend the CI to check the workspace as a whole but then run
checks, tests, and doc generation on the workspace members individually,
asserting that all of them build even when not built as part of the same
workspace as `lightning`.
Fix bug where we double-pay an offer due to stale manager
This fixes the following bug:
- An outbound payment is AwaitingInvoice
- We receive an invoice and lock the HTLCs into the relevant ChannelMonitors
- The monitors are successfully persisted, but the ChannelManager fails to
persist, so the outbound payment remains AwaitingInvoice
- We restart, causing the channels to close due to a stale ChannelManager
- We receive a duplicate invoice, and attempt to pay it again due to the
payment still being AwaitingInvoice in the stale ChannelManager
After the fix for this, we will notice that the payment is already locked into
the monitor on startup and transition the incorrectly-AwaitingInvoice payment
to Retryable, which prevents double-paying on duplicate invoice receipt.
Jeffrey Czyz [Thu, 1 Aug 2024 15:56:51 +0000 (10:56 -0500)]
Rename Offer::signing_pubkey to Offer::issuer_signing_pubkey
The spec was recently changed to use offer_issuer_id instead of
offer_node_id. LDK always used signing_pubkey to avoid confusion with a
node_id. Rename it to issuer_signing_pubkey now as InvoiceRequest and
Bolt12Invoice will have similarly named methods in upcoming commits.
Move the code that ensures that HTLCs locked into ChannelMonitors are
synchronized with the ChannelManager's OutboundPayments store to the
outbound_payments module.
This is useful both because ChannelManager::read is very long/confusing method,
so it's nice to encapsulate some of its functionality, and because we need to
fix an existing bug in this logic where we may risk double-paying an offer due
to outbound_payments being stale on startup. See the next commit for this
bugfix.
Currently we don't have any visibility if BackgroundProcessor
takes considerably more of time to process events, adding logs
to help debug such issues.
While these variants may sound similar, they are very different. One is so
temporary it's never even persisted to disk, the other is a state we will stay
in for hours or days. See added docs for more info.
Add new Bolt12PaymentError for failed blinded path creation.
Currently used when initiating an async payment via held_htlc_available OM. This
OM needs a reply path back to us, so use this error for our invoice_error OM if
we fail to create said reply path.
See AsyncPaymentsContext::hmac, but this prevents the recipient from
deanonymizing us. Without this, if they are able to guess the correct payment
id, then they could create a blinded path to us and confirm our identity.
We also move the PAYMENT_HASH_HMAC_INPUT const to use &[7; 16], which is safe
because this const was added since the last release. This ordering reads more
smoothly.
Rename Payment{Hash,Id} hmac creation/verification methods for offers.
We want to specify that these methods are only to be used in an outbound offers
payment context, because we'll be adding similar methods for the outbound async
payments context in upcoming commits.
Don't trigger manager persistence on unexpected release_htlc message.
If someone sends us an unexpected or duplicate release_held_htlc onion message,
we should simply ignore it and not persist the entire ChannelManager in
response.
Support abandoning pending outbound async payments.
Async payments may have very high expires because we may be waiting for days
for the recipient to come online, so it's important that users be able to
abandon these payments early if needed.
Support sending async payments as an always-online sender.
Async receive is not yet supported.
Here we process inbound release_htlc onion messages, check that they actually
correspond to one of our outbound payments, and actually forward the HTLCs.
Valid release_htlc receipt indicates that the recipient has now come online to
receive.
Because we may receive a static invoice to pay days before the recipient
actually comes back online to receive the payment, it's good to do as many
checks as we can up-front. Here we ensure that the blinded paths provided
in the invoice won't cause us to exceed the maximum onion packet size.
Support initiating an async payment to a static invoice.
Supported when the sender is an always-online node. Here we send the initial
held_htlc_available onion message upon receipt of a static invoice, next we'll
need to actually send HTLCs upon getting a response to said OM.
Store async payment data in PendingOutboundPayment.
Adds a pending outbound payment variant for async payments, which indicates
that we have received a static invoice to pay and have generated a keysend preimage
for the eventual payment. When the recipient comes back online, we'll
transition from this new state to Retryable and actually forward the HTLCs.
Support checking that a static invoice matches an outbound invreq.
Useful for ensuring that an inbound static invoice matches one of our outbound
invreqs, otherwise it is an unexpected invoice and should be ignored and not
paid.
Upcoming commits will support sending and receiving held_htlc_available and
release_held_htlc messages. These messages need to be enqueued so that they can
be released in ChannelManager's implementation of AsyncPaymentsMessageHandler
to OnionMessenger for sending.
Pass context into held_htlc_available message handling.
Useful for using the payment_id within to look up the corresponding outbound
async payment so we know we can safely release the HTLCs to the now-onlinen
recipient.
This context will be used in reply paths for outbound held_htlc_available
messages, so we can authenticate the corresponding release_held_htlc messages.
Matt Corallo [Sun, 8 Sep 2024 19:05:28 +0000 (19:05 +0000)]
Simplify and fix `AtomicCounter`
`AtomicCounter` was slightly race-y on 32-bit platforms because it
increments the high `AtomicUsize` independently from the low
`AtomicUsize`, leading to a potential race where another thread
could observe the low increment but not the high increment and see
a value of 0 twice.
This isn't a big deal because (a) most platforms are 64-bit these
days, (b) 32-bit platforms aren't super likely to have their
counter overflow 32 bits anyway, and (c) the two writes are
back-to-back so having another thread read during that window is
very unlikely.
However, we can also optimize the counter somewhat by using the
`target_has_atomic = "64"` cfg flag, which we do here, allowing us
to use `AtomicU64` even on 32-bit platforms where 64-bit atomics
are available.
This changes some test behavior slightly, which requires
adaptation.
- Add a test to verify the functionality of the handle_message_received
function.
- Ensure the test covers scenarios where InvoiceRequest messages are retried
for PendingOutboundPayments after a simulated connection loss.
shaavan [Mon, 10 Jun 2024 11:46:08 +0000 (17:16 +0530)]
Introduce message_received in ChannelMessageHandler
- Introduce the `message_received` function to manage the
behavior when a message is received from any peer.
- This function is used within `ChannelManager` to retry `InvoiceRequest`
messages if we haven't received the corresponding invoice yet.
- This change makes the offer communication robust against sudden
connection drops where the initial attempt to send the message
might have failed.