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BOLT 12 Offers utilities #2578

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merged 15 commits into from Oct 19, 2023

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jkczyz
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@jkczyz jkczyz commented Sep 14, 2023

Add utility methods to ChannelManager for:

  • creating OfferBuilder such that derived keys are used for the signing pubkey,
  • creating RefundBuilder such that derived keys are used for the payer id, and
  • sending an InvoiceRequest for an Offer such that derived keys are used for the payer id

When the ChannelManager is the payer (i.e., when creating Refund and InvoiceRequest), a PaymentId is required and used for tracking the outbound payment once the Bolt12Invoice is received.

One-hop blinded paths are used throughout until multi-hop blinded paths are supported.

Offer message handling and sending a Bolt12Invoice for a Refund such that derived keys are used for the signing pubkey are in #2039, which is based on this PR.

@jkczyz jkczyz marked this pull request as ready for review September 14, 2023 22:44
/// The message contents to send in an [`OnionMessage`].
///
/// [`OnionMessage`]: crate::ln::msgs::OnionMessage
pub contents: T,
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Hmm, if we leave a totally unbounded type that's gonna be a problem for bindings. Can we bound this by CustomOnionMessageContents (or if we need a general bound we could create an OnionMessageContents trait that we impl for BOLT12 messages as well)?

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We'll need a more general bound since OffersMessage is used, too.

/// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
/// [`InvoiceRequestBuilder`]: crate::offers::invoice_request::InvoiceRequestBuilder
/// [`Bolt12Invoice`]: crate::offers::invoice::Bolt12Invoice
pub fn request_invoice(
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Does this need to be pub? I'm not sure what the use is for this outside of simply paying an offer, which is presumably a different method.

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Ah, this is the "paying for an offer" method. I guess that I can rename it to be more user- rather than implementation-focused.

@@ -118,6 +118,13 @@ pub enum OnionMessageContents<T: CustomOnionMessageContents> {
Custom(T),
}

/// A type used within a variant of [`OnionMessageContents`].
pub trait OnionMessageContentsType {}
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Rather than an empty trait, should we just rename CustomOnionMessageContents to OnionMessageContents and impl it for Bolt12/etc? Its already basically what we want - extends Write and has a tlv_type.

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Hmmm... we already have an OnionMessageContents enum.

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Oh, then lets use that in PendingOnionMessage instead of a generic type T?

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It also seems arbitrary that a custom message handler isn't allowed to send BOLT12 messages.

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But we don't want a BOLT 12 handler to be able to send arbitrary ones. A custom handler can alway have their type wrap OffersMessage in a variant.

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I mean...why not? We could also drop OnionMessageContents or make it priv, and replace most usages with a trait.

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Discussed offline and made the following changes:

  • Renamed OnionMessageContents to ParsedOnionMessageContents and gave it pub(super) visibility
  • Renamed CustomOnionMessageContents to OnionMessageContents and used it as a trait bound on most methods
  • Changed Payload to hold T instead of ParsedOnionMessageContents<T> where T: OnionMessageContents
  • Implemented OnionMessageContents for OffersMessage and ParsedOnionMessageContents. The latter is needed so that arbitrary Payload contents can be read and specific contents can be written

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codecov-commenter commented Sep 19, 2023

Codecov Report

Attention: 91 lines in your changes are missing coverage. Please review.

Comparison is base (0357caf) 89.04% compared to head (905028b) 88.96%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #2578      +/-   ##
==========================================
- Coverage   89.04%   88.96%   -0.09%     
==========================================
  Files         112      112              
  Lines       87527    87632     +105     
  Branches    87527    87632     +105     
==========================================
+ Hits        77942    77963      +21     
- Misses       7345     7435      +90     
+ Partials     2240     2234       -6     
Files Coverage Δ
lightning/src/events/mod.rs 28.97% <ø> (-4.86%) ⬇️
lightning/src/ln/msgs.rs 76.81% <ø> (ø)
lightning/src/offers/offer.rs 94.65% <100.00%> (+0.01%) ⬆️
lightning/src/offers/parse.rs 92.30% <ø> (ø)
lightning/src/offers/refund.rs 93.67% <100.00%> (+0.02%) ⬆️
lightning/src/onion_message/functional_tests.rs 96.95% <100.00%> (+0.07%) ⬆️
lightning/src/routing/router.rs 94.07% <ø> (ø)
lightning/src/ln/outbound_payment.rs 87.69% <90.32%> (+0.16%) ⬆️
lightning/src/ln/peer_handler.rs 58.79% <25.00%> (-0.10%) ⬇️
lightning/src/blinded_path/mod.rs 70.14% <33.33%> (-5.66%) ⬇️
... and 4 more

... and 7 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

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Initial look, just nits

@@ -208,19 +211,6 @@ mod tests {

#[test]
fn test_no_onion_message_breakage() {
let one_hop_om = "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";
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I don't mind too much, but why remove this?

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@jkczyz jkczyz Sep 20, 2023

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Restored it but now the test needs to check against InvalidFirstHop, which I'm not sure if that is intended?

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Mm that shouldn't be intended. It looks like that's because the first-hop peer in the reply path isn't connected.

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Will reexamine this but want to get the other changes pushed for now.

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Sure, I'd also be fine with saving this for follow-up if you want to note it in #1970.

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Ok, other than the introduction node being wrong, when hardcoding a fix I'm also seeing this logging:

Received an onion message with path_id Some([]) and a reply_path

Instead of the expected:

Received an onion message with path_id None and a reply_path

But I don't understand how my change would affect the path_id. Any ideas?

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Oh, nevermind on this. That was just because I had been building using some unpublished commits instead of during the rebase. 🤦‍♂️

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Opened #2671

lightning/src/blinded_path/mod.rs Outdated Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Outdated Show resolved Hide resolved
lightning/src/ln/msgs.rs Outdated Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Outdated Show resolved Hide resolved
@jkczyz jkczyz added this to the 0.0.117 milestone Sep 20, 2023
@jkczyz jkczyz mentioned this pull request Sep 18, 2023
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@TheBlueMatt TheBlueMatt modified the milestones: 0.0.117, 0.0.118 Sep 25, 2023
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jkczyz commented Oct 11, 2023

Rebased as there were a lot of merge conflicts from the last release.

lightning/src/onion_message/messenger.rs Outdated Show resolved Hide resolved
@@ -208,19 +211,6 @@ mod tests {

#[test]
fn test_no_onion_message_breakage() {
let one_hop_om = "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";
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Mm that shouldn't be intended. It looks like that's because the first-hop peer in the reply path isn't connected.

lightning/src/ln/channelmanager.rs Outdated Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Outdated Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Outdated Show resolved Hide resolved
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Need to look into addressing the fuzz test comment still.

lightning/src/ln/channelmanager.rs Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Outdated Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Outdated Show resolved Hide resolved
lightning/src/onion_message/offers.rs Outdated Show resolved Hide resolved
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I think this LGTM, I guess its now based on #2662, but once that lands feel free to squash.

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There's probably gonna be some conflicts between this and #2599

@jkczyz jkczyz force-pushed the 2023-09-offer-utilities branch 2 times, most recently from 4f520cc to 6b96866 Compare October 16, 2023 13:54
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LGTM, some tiny nits, feel free to squash.

lightning/src/onion_message/messenger.rs Show resolved Hide resolved

let builder = RefundBuilder::deriving_payer_id(
description, node_id, expanded_key, entropy, secp_ctx, amount_msats, payment_id
)?
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Pretty awkward to return a full huge enum just if the user provided an amount > MAX_VALUE_MSAT. Can we check it first and unwrap the builder? Then we don't have to add a dup payment id to Bolt12 errors, which feels wrong.

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Wouldn't we still need two different errors? One for the amount and one for duplicate payment id?

If we are fine just using () then an explicit check isn't needed, as we can just use map_err on builder result.

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I mean we can almost just panic if the amount is too high, but I think its fine to tell users "we return an error if you duplicate the payment id or the amount is greater than max-amount". Users can figure out if the amount isnt invalid and just assume the payment id is duplicative, basically.

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I'm going to leave this as-is. We have a similar problem in pay_for_offer only there are many more ways the builder can fail there.

@@ -1216,6 +1223,8 @@ where
event_persist_notifier: Notifier,
needs_persist_flag: AtomicBool,

pending_offers_messages: Mutex<Vec<PendingOnionMessage<OffersMessage>>>,
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Since this is unused in this PR can we move this commit to the next PR? Maybe the pay_for_offer impl too.

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Yeah, this is used in pay_for_offer, so will need to move both.

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Moved these to #2039.

lightning/src/ln/channelmanager.rs Show resolved Hide resolved
.path(path);

self.pending_outbound_payments
.add_new_awaiting_invoice(payment_id, retry_strategy, max_total_routing_fee_msat)
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I was assuming we'd min them, but honestly I'm fine with either version (as-is or with a min against the ticks).

@@ -691,6 +731,8 @@ fn packet_payloads_and_keys<T: CustomOnionMessageContents, S: secp256k1::Signing
next_node_id: intro_node_id,
next_blinding_override: Some(blinding_pt),
})), control_tlvs_ss));
} else {
prev_control_tlvs_ss = Some(control_tlvs_ss);
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Tests seem to pass fine with this line omitted (and it looks like this is init'd in the else in the below if).

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Yeah, looks like it is no longer needed after rebasing as the new code was added in 7c1726b.

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jkczyz commented Oct 18, 2023

Speaking of timeouts, we should check if the payment has timed out per the AwaitingInvoice::retry_stragety (assuming its a time-based one) in the timer tick too.

Discussed offline. It would be better to keep the retry strategy separate from when to expire waiting for an invoice.

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Only comment left form my end is #2578 (comment), which you can fix or not, but either way lets squash and I'll ack :)

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Sorry needs a small-ish rebase after #2599.

OnionMessageProvider is a super-trait of OnionMessageHandler, but they
don't need to be used separately. Additionally, the former is misplaced
in the events module. Remove OnionMessageProvider and add it's only
method, next_onion_message_for_peer, into OnionMessageHandler.
OnionMessenger can send onion message responses from its handlers using
respond_with_onion_message, which finds a path to the destination and
enqueues the response for sending. Generalize this as it can be used not
only for responses but for initial sends as well.
In preparation for needing the name OnionMessageContents for a trait to
bound methods, rename it to ParsedOnionMessageContents. In the next
commit, it's use will be limited to reading only, and the new trait will
be a bound on method parameters instead.
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LGTM after rebase

lightning/src/ln/channelmanager.rs Outdated Show resolved Hide resolved
lightning/src/ln/channelmanager.rs Show resolved Hide resolved
lightning/src/onion_message/messenger.rs Outdated Show resolved Hide resolved
Rename CustomOnionMessageContents to OnionMessageContents and use it as
a trait bound on messages passed to OnionMessenger methods. This allows
using the trait in an upcoming commit as a bound on the contents of
PendingOnionMessage.

Also, make ParsedOnionMessageContent implement OnionMessageContents so
that Payload can be bounded by OnionMessageContents directly, but used
when either reading a ParsedOnionMessageContent or writing a specific
type of OnionMessageContents (e.g., OffersMessage).
When constructing onion messages to send initially (opposed to replying
to one from a handler), the user must construct an OnionMessagePath first
before calling OnionMessener::send_onion_message. Additionally, having a
reference to OnionMessener isn't always desirable. For instance, in an
upcoming commit, ChannelManager will implement OffersMessageHandler,
which OnionMessenger needs a reference to. If ChannelManager had a
reference to OnionMessenger, too, there would be a dependency cycle.

Instead, modify OffersMessageHandler and CustomOnionMessageHandler's
interfaces to include a method for releasing pending onion messages.
That way, ChannelManager may, for instance, construct and enqueue an
InvoiceRequest for sending without needing a reference to
OnionMessenger.

Additionally, OnionMessenger has responsibility for path finding just as
it does when replying to messages from a handler. It performs this when
extracting messages from the handlers before returning the next message
to send to a peer.
This allows for specifying the introduction node as the message
recipient.
PendingOutboundPayment::AwaitingInvoice counts the number of timer ticks
that have passed awaiting a Bolt12Invoice for an InvoiceRequest. When a
constant INVOICE_REQUEST_TIMEOUT_TICKS has passed, the payment is
forgotten. However, this mechanism is insufficient for the Refund
scenario, where the Refund's expiration should be used instead.

Change AwaitingInvoice to store an absolute expiry instead. When
removing stale payments, pass the `SystemTime` in `std` and the highest
block time minus two hours in `no-std`.
Add utility functions to ChannelManager for creating OfferBuilder,
and RefundBuilder such that derived keys are used for the signing
pubkey and payer id, respectively. This allows for stateless
verification of any InvoiceRequest and Invoice messages.

Later, blinded paths can be included in the returned builders.

Also tracks future payments using the given PaymentId such that the
corresponding Invoice is paid only once.
While this doesn't add much privacy over not including any blinded
paths, it allows us to exercise code for receiving on blinded paths.
For consistency with other functions and doc cleanliness.
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jkczyz commented Oct 18, 2023

Sorry needs a small-ish rebase after #2599.

Rebased. Needed to expose ParsedOnionMessageContents because of this.

/// Creates a [`RefundBuilder`] such that the [`Refund`] it builds is recognized by the
/// [`ChannelManager`] when handling [`Bolt12Invoice`] messages for the refund. The builder will
/// have the provided expiration set. Any changes to the expiration on the returned builder will
/// not be honored by [`ChannelManager`].
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We need to mention the two-hour thing here, its a bit awkward its buried in the timer_tick_occurred docs. Can happen in a followup, though.

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Updated in #2039.

@TheBlueMatt TheBlueMatt merged commit 1852715 into lightningdevkit:main Oct 19, 2023
14 of 15 checks passed
/// [`ChannelManager`] when handling [`Bolt12Invoice`] messages for the refund. The builder will
/// have the provided expiration set. Any changes to the expiration on the returned builder will
/// not be honored by [`ChannelManager`].
///
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Oh also we should probably say something about how you can use abandon_payment to revoke a refund once issued (if it hasn't been paid). Its somewhat non-intuitive to me that that is true.

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Updated in #2039.

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5 participants