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42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
#include <common/htlc_trim.h>
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#include <common/htlc_tx.h>
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/* If this htlc too small to create an output on @side's commitment tx? */
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bool htlc_is_trimmed(enum side htlc_owner,
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struct amount_msat htlc_amount,
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u32 feerate_per_kw,
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struct amount_sat dust_limit,
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enum side side)
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{
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struct amount_sat htlc_fee, htlc_min;
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/* BOLT #3:
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*
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* - for every offered HTLC:
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* - if the HTLC amount minus the HTLC-timeout fee would be less than
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* `dust_limit_satoshis` set by the transaction owner:
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* - MUST NOT contain that output.
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* - otherwise:
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* - MUST be generated as specified in
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* [Offered HTLC Outputs](#offered-htlc-outputs).
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*/
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if (htlc_owner == side)
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htlc_fee = htlc_timeout_fee(feerate_per_kw);
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/* BOLT #3:
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*
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* - for every received HTLC:
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* - if the HTLC amount minus the HTLC-success fee would be less than
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* `dust_limit_satoshis` set by the transaction owner:
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* - MUST NOT contain that output.
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* - otherwise:
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* - MUST be generated as specified in
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*/
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else
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htlc_fee = htlc_success_fee(feerate_per_kw);
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/* If these overflow, it implies htlc must be less. */
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if (!amount_sat_add(&htlc_min, dust_limit, htlc_fee))
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return true;
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return amount_msat_less_sat(htlc_amount, htlc_min);
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}
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