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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
`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.
Fixes#3000
- 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.
