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Fix comment spelling and clarify algebra a bit.

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This commit is contained in:
Matt Corallo 2019-01-11 16:31:30 -05:00
parent d8707c2b20
commit f065a62d40
1 changed files with 6 additions and 3 deletions
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9
src/ln/channelmonitor.rs
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@ -1821,9 +1821,12 @@ impl ChannelMonitor {
// least CLTV_CLAIM_BUFFER blocks prior to the inbound HTLC.
// aka outbound_cltv + HTLC_FAIL_TIMEOUT_BLOCKS == height - CLTV_CLAIM_BUFFER
// inbound_cltv == height + CLTV_CLAIM_BUFFER
// outbound_cltv + HTLC_FAIL_TIMEOUT_BLOCKS + CLTV_CLAIM_BUFER <= inbound_cltv - CLTV_CLAIM_BUFFER
// HTLC_FAIL_TIMEOUT_BLOCKS + 2*CLTV_CLAIM_BUFER <= inbound_cltv - outbound_cltv
// HTLC_FAIL_TIMEOUT_BLOCKS + 2*CLTV_CLAIM_BUFER <= CLTV_EXPIRY_DELTA
// outbound_cltv + HTLC_FAIL_TIMEOUT_BLOCKS + CLTV_CLAIM_BUFFER <= inbound_cltv - CLTV_CLAIM_BUFFER
// HTLC_FAIL_TIMEOUT_BLOCKS + 2*CLTV_CLAIM_BUFFER <= inbound_cltv - outbound_cltv
// CLTV_EXPIRY_DELTA <= inbound_cltv - outbound_cltv (by check in ChannelManager::decode_update_add_htlc_onion)
// HTLC_FAIL_TIMEOUT_BLOCKS + 2*CLTV_CLAIM_BUFFER <= CLTV_EXPIRY_DELTA
// The final, above, condition is checked for statically in channelmanager
// with CHECK_CLTV_EXPIRY_SANITY_2.
let htlc_outbound = $local_tx == htlc.offered;
if ( htlc_outbound && htlc.cltv_expiry + HTLC_FAIL_TIMEOUT_BLOCKS <= height) ||
(!htlc_outbound && htlc.cltv_expiry <= height + CLTV_CLAIM_BUFFER && self.payment_preimages.contains_key(&htlc.payment_hash)) {