connectd: add "use_uniform_writes" per-peer helper.

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

Author: rustyrussell

connectd/multiplex.c

@@ -481,14 +481,18 @@ static bool have_empty_encrypted_queue(const struct peer *peer)
 	return membuf_num_elems(&peer->encrypted_peer_out) == 0;
 }
 
+static bool use_uniform_writes(const struct peer *peer)
+{
+	return peer->daemon->dev_uniform_padding;
+}
+
 /* (Continue) writing the encrypted_peer_out array */
 static struct io_plan *write_encrypted_to_peer(struct peer *peer)
 {
 	size_t avail = membuf_num_elems(&peer->encrypted_peer_out);
 	/* With padding: always a full uniform-size chunk.
 	 * Without: flush whatever we have (caller ensures non-zero). */
-	size_t write_size = peer->daemon->dev_uniform_padding
-		? UNIFORM_MESSAGE_SIZE : avail;
+	size_t write_size = use_uniform_writes(peer) ? UNIFORM_MESSAGE_SIZE : avail;
 
 	assert(avail >= write_size && write_size > 0);
 	return io_write_partial(peer->to_peer,
@@ -1250,8 +1254,8 @@ static struct io_plan *write_to_peer(struct io_conn *peer_conn,
 				/* Wait for them to wake us */
 				return msg_queue_wait(peer_conn, peer->peer_outq, write_to_peer, peer);
 			}
-			/* OK, add padding (only if --dev-uniform-padding enabled). */
-			if (peer->daemon->dev_uniform_padding)
+			/* OK, add padding (only if supported). */
+			if (use_uniform_writes(peer))
 				pad_encrypted_queue(peer);
 			else
 				break;