Include payment hash in more early payment logs #2515
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If a user has issues with a payment, the most obvious thing they'll do is check logs for the payment hash. Thus, we should ensure our logs that show a payment's lifecycle include the payment hash and are emitted (a) as soon as LDK learns of the payment, (b) once the payment goes out to the peer (which is already reasonably covered in the commitment transaction building logs) and (c) when the payment ultimately is fulfilled or fails. Here we improve our logs for both (a) and (c).
Currently, when we receive an HTLC claim from a peer, we first hash the preimage they gave us before removing the HTLC, then immediately pass the preimage to the inbound channel and hash the preimage again before removing the HTLC and sending our peer an `update_fulfill_htlc`. This second hash is actually only asserted on, never used in any meaningful way as we have the htlc data present in the same code. Here we simply drop this second hash and move it into a `debug_assert`.
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wpaulino
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Aug 23, 2023
valentinewallace
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Aug 23, 2023
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Based on #2492,If a user has issues with a payment, the most obvious thing they'll
do is check logs for the payment hash. Thus, we should ensure our
logs that show a payment's lifecycle include the payment hash and
are emitted (a) as soon as LDK learns of the payment, (b) once the
payment goes out to the peer (which is already reasonably covered
in the commitment transaction building logs) and (c) when the
payment ultimately is fulfilled or fails.
Here we improve our logs for both (a) and (c).
As a nice bonus, we also remove a sha256 hash of a payment preimage in every forwarded HTLC claim :).