Fix keysend not being sent in OutboundPayment::send_payment_internal
#2475
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Fixes a bug where we wouldn't use the provided keysend preimage when piping through OutboundPayment::pay_route_internal. Also simplifies and refactors existing keysend tests to make sure this gets hit.
Codecov ReportPatch coverage:
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## main #2475 +/- ##
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- Coverage 90.34% 90.34% -0.01%
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Files 106 106
Lines 55784 55771 -13
Branches 55784 55771 -13
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- Hits 50398 50386 -12
+ Misses 5386 5385 -1
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| nodes[0].logger, &scorer, &(), &random_seed_bytes | ||
| ).unwrap(); | ||
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| let test_preimage = PaymentPreimage([42; 32]); |
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The real issue is that the test just reused the preimage instead of extracting it from the event. Can you put the preimage and send in a {}, that way the claiming logic further down has no access to it at all.
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I think that's okay since pass_along_path checks that the preimage from Event::PaymentClaimable matches the expected one passed in?
I had mainly noticed that a problem was that we never tested a full payment using spontaneous_with_retry which uses OutboundPayment::send_payment_internal whereas the method without retries doesn't
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Not really a big deal, I wrote up more of what I was suggesting as #2481, which I'm fine with not merging if anyone disagrees, but I like the explicit scope to demonstrate information lifetime.
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LGTM, new test fails when I revert the change. Not the first time we've unknowingly broken keysend :( We have existing coverage of keysend retrying when initiated with send_spontaneous_payment_with_retry, but were missing first-try-success coverage.
I don't quite get @TheBlueMatt's comment but it sounds like it can be addressed in follow-up so I'll merge
Following up on #2465. I kept thinking that it doesn't make sense that we'd reject a keysend payment based on our feature bit not being set. After some digging, I found the issue was that we weren't sending the preimage.