doc: include recent BOLT recommendation on grace period.

This includes the recommendation that we use 10 minute grace period, so add quotes to where we use that. Signed-off-by: Rusty Russell <[email protected]>
ElementsProject · Aug 27, 2022 · a86468d · a86468d
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commit a86468d
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diff --git a/lightningd/peer_control.c b/lightningd/peer_control.c
@@ -2585,6 +2585,10 @@ static struct command_result *json_setchannelfee(struct command *cmd,
 			     &base, cmd->ld->config.fee_base),
 		   p_opt_def("ppm", param_number, &ppm,
 			     cmd->ld->config.fee_per_satoshi),
+		   /* BOLT #7:
+		    * If it creates a new `channel_update` with updated channel parameters:
+		    *    - SHOULD keep accepting the previous channel parameters for 10 minutes
+		    */
 		   p_opt_def("enforcedelay", param_number, &delaysecs, 600),
 		   NULL))
 		return command_param_failed();

diff --git a/lightningd/peer_htlcs.c b/lightningd/peer_htlcs.c
@@ -720,7 +720,10 @@ static void forward_htlc(struct htlc_in *hin,
 	if (!check_fwd_amount(hin, amt_to_forward, hin->msat,
 			      next->feerate_base,
 			      next->feerate_ppm)) {
-		/* Are we in old-fee grace-period? */
+		/* BOLT #7:
+		 * - If it creates a new `channel_update` with updated channel parameters:
+		 *    - SHOULD keep accepting the previous channel parameters for 10 minutes
+		 */
 		if (!time_before(time_now(), next->old_feerate_timeout)
 		    || !check_fwd_amount(hin, amt_to_forward, hin->msat,
 					 next->old_feerate_base,