fix: round up sub-satoshi invoice amounts to prevent underpayment#85
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fix: round up sub-satoshi invoice amounts to prevent underpayment#85
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Lightning invoices can have millisatoshi precision (e.g. 18557538 msat = 18557.538 sats). The previous floor division (/ 1000) truncated this to 18557 sats, causing payments to fail when the app converted back to msat (18557000 < 18557538 required). Use ceiling division (div_ceil) so amount_satoshis is always sufficient to cover the invoice's msat amount. Closes synonymdev/bitkit-ios#511 Closes synonymdev/bitkit-android#877
Code reviewNo issues found. Checked for bugs and CLAUDE.md compliance. |
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Summary
18557538 msat=18557.538 sats) were truncated by floor division to18557 sats, causingsendUsingAmountto send18557000 msat— less than the invoice requires — and LDK to reject the payment.amount_satoshisfrom floor (/ 1000) to ceiling (div_ceil(1000)) so the sats value always covers the invoice's msat amount..5), exact sat amounts, and boundary cases.Test plan
cargo test scanner— 19 tests passlnd.addInvoice({ valueMsat })using amounts222538,222222,500500msatCloses synonymdev/bitkit-ios#511
Closes synonymdev/bitkit-android#877
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