channeld: cleanup: use the channel_feerate() accessor everywhere.

And also move it to initial_channel, so we can use it there.

This saves churn in the next patch.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

channeld/channeld.c

@@ -1392,11 +1392,11 @@ static void handle_peer_commit_sig(struct peer *peer, const u8 *msg)
 	/* We were supposed to check this was affordable as we go. */
 	if (peer->channel->funder == REMOTE) {
 		status_debug("Feerates are %u/%u",
-			     peer->channel->view[LOCAL].feerate_per_kw,
+			     channel_feerate(peer->channel, LOCAL),
-			     peer->channel->view[REMOTE].feerate_per_kw);
+			     channel_feerate(peer->channel, REMOTE));
 		assert(can_funder_afford_feerate(peer->channel,
-						 peer->channel->view[LOCAL]
+						 channel_feerate(peer->channel,
-						 .feerate_per_kw));
+								 LOCAL)));
 	}
 
 	if (!fromwire_commitment_signed(tmpctx, msg,
@@ -1443,7 +1443,7 @@ static void handle_peer_commit_sig(struct peer *peer, const u8 *msg)
 			    type_to_string(msg, struct pubkey,
 					   &peer->channel->funding_pubkey
 					   [REMOTE]),
-			    peer->channel->view[LOCAL].feerate_per_kw);
+			    channel_feerate(peer->channel, LOCAL));
 	}
 
 	/* BOLT #2:

channeld/full_channel.c

@@ -231,7 +231,7 @@ static void add_htlcs(struct bitcoin_tx ***txs,
 {
 	size_t i;
 	struct bitcoin_txid txid;
-	u32 feerate_per_kw = channel->view[side].feerate_per_kw;
+	u32 feerate_per_kw = channel_feerate(channel, side);
 
 	/* Get txid of commitment transaction */
 	bitcoin_txid((*txs)[0], &txid);
@@ -306,7 +306,7 @@ struct bitcoin_tx **channel_txs(const tal_t *ctx,
 	    ctx, &channel->funding_txid, channel->funding_txout,
 	    channel->funding, channel->funder,
 	    channel->config[!side].to_self_delay, &keyset,
-	    channel->view[side].feerate_per_kw,
+	    channel_feerate(channel, side),
 	    channel->config[side].dust_limit, channel->view[side].owed[side],
 	    channel->view[side].owed[!side], committed, htlcmap,
 	    commitment_number ^ channel->commitment_number_obscurer, side);
@@ -370,7 +370,7 @@ static struct amount_sat fee_for_htlcs(const struct channel *channel,
 				       const struct htlc **removing,
 				       enum side side)
 {
-	u32 feerate = view->feerate_per_kw;
+	u32 feerate = channel_feerate(channel, side);
 	struct amount_sat dust_limit = channel->config[side].dust_limit;
 	size_t untrimmed;
 
@@ -972,11 +972,6 @@ bool channel_update_feerate(struct channel *channel, u32 feerate_per_kw)
 	return true;
 }
 
-u32 channel_feerate(const struct channel *channel, enum side side)
-{
-	return channel->view[side].feerate_per_kw;
-}
-
 bool channel_sending_commit(struct channel *channel,
 			    const struct htlc ***htlcs)
 {

common/initial_channel.c

@@ -100,7 +100,7 @@ struct bitcoin_tx *initial_channel_tx(const tal_t *ctx,
 				 /* They specify our to_self_delay and v.v. */
 				 channel->config[!side].to_self_delay,
 				 &keyset,
-				 channel->view[side].feerate_per_kw,
+				 channel_feerate(channel, side),
 				 channel->config[side].dust_limit,
 				 channel->view[side].owed[side],
 				 channel->view[side].owed[!side],
@@ -110,6 +110,11 @@ struct bitcoin_tx *initial_channel_tx(const tal_t *ctx,
 				 err_reason);
 }
 
+u32 channel_feerate(const struct channel *channel, enum side side)
+{
+	return channel->view[side].feerate_per_kw;
+}
+
 static char *fmt_channel_view(const tal_t *ctx, const struct channel_view *view)
 {
 	return tal_fmt(ctx, "{ feerate_per_kw=%"PRIu32","

common/initial_channel.h

@@ -122,4 +122,11 @@ struct bitcoin_tx *initial_channel_tx(const tal_t *ctx,
 				      enum side side,
 				      char** err_reason);
 
+/**
+ * channel_feerate: Get fee rate for this side of channel.
+ * @channel: The channel
+ * @side: the side
+ */
+u32 channel_feerate(const struct channel *channel, enum side side);
+
 #endif /* LIGHTNING_COMMON_INITIAL_CHANNEL_H */