lightningd: return `features` in connect response.

This is useful in general, but in particular it allows fundchannel to avoid YA
query to figure out if it can wumbo.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Added: JSON: `connect` returns `features` of the connected peer on success.

doc/lightning-connect.7

@@ -42,7 +42,8 @@ another node\. Once the peer is connected a channel can be opened with
 
 .SH RETURN VALUE
 
-On success the peer \fIid\fR is returned\.
+On success the peer \fIid\fR is returned, as well as a hexidecimal \fIfeatures\fR
+bitmap\.
 
 .SH ERRORS
 

doc/lightning-connect.7.md

@@ -39,7 +39,8 @@ lightning-fundchannel(7).
 RETURN VALUE
 ------------
 
-On success the peer *id* is returned.
+On success the peer *id* is returned, as well as a hexidecimal *features*
+bitmap.
 
 ERRORS
 ------

lightningd/connect_control.c

@@ -68,10 +68,11 @@ static struct connect *find_connect(struct lightningd *ld,
 }
 
 static struct command_result *connect_cmd_succeed(struct command *cmd,
-						  const struct node_id *id)
+						  const struct peer *peer)
 {
 	struct json_stream *response = json_stream_success(cmd);
-	json_add_node_id(response, "id", id);
+	json_add_node_id(response, "id", &peer->id);
+	json_add_hex_talarr(response, "features", peer->features);
 	return command_success(cmd, response);
 }
 
@@ -139,7 +140,7 @@ static struct command_result *json_connect(struct command *cmd,
 
 		if (peer->uncommitted_channel
 		    || (channel && channel->connected)) {
-			return connect_cmd_succeed(cmd, &id);
+			return connect_cmd_succeed(cmd, peer);
 		}
 	}
 
@@ -256,14 +257,14 @@ static void connect_failed(struct lightningd *ld, const u8 *msg)
 		delay_then_reconnect(channel, seconds_to_delay, addrhint);
 }
 
-void connect_succeeded(struct lightningd *ld, const struct node_id *id)
+void connect_succeeded(struct lightningd *ld, const struct peer *peer)
 {
 	struct connect *c;
 
 	/* We can have multiple connect commands: fail them all */
-	while ((c = find_connect(ld, id)) != NULL) {
+	while ((c = find_connect(ld, &peer->id)) != NULL) {
 		/* They delete themselves from list */
-		connect_cmd_succeed(c->cmd, id);
+		connect_cmd_succeed(c->cmd, peer);
 	}
 }
 

lightningd/connect_control.h

@@ -12,7 +12,7 @@ void connectd_activate(struct lightningd *ld);
 
 void delay_then_reconnect(struct channel *channel, u32 seconds_delay,
 			  const struct wireaddr_internal *addrhint TAKES);
-void connect_succeeded(struct lightningd *ld, const struct node_id *id);
+void connect_succeeded(struct lightningd *ld, const struct peer *peer);
 void gossip_connect_result(struct lightningd *ld, const u8 *msg);
 
 #endif /* LIGHTNING_LIGHTNINGD_CONNECT_CONTROL_H */

lightningd/peer_control.c

@@ -996,9 +996,6 @@ void peer_connected(struct lightningd *ld, const u8 *msg,
 	per_peer_state_set_fds(hook_payload->pps,
 			       peer_fd, gossip_fd, gossip_store_fd);
 
-	/* Complete any outstanding connect commands. */
-	connect_succeeded(ld, &id);
-
 	/* If we're already dealing with this peer, hand off to correct
 	 * subdaemon.  Otherwise, we'll hand to openingd to wait there. */
 	peer = peer_by_id(ld, &id);
@@ -1010,6 +1007,9 @@ void peer_connected(struct lightningd *ld, const u8 *msg,
 
 	peer_update_features(peer, features);
 
+	/* Complete any outstanding connect commands. */
+	connect_succeeded(ld, peer);
+
 	/* Can't be opening, since we wouldn't have sent peer_disconnected. */
 	assert(!peer->uncommitted_channel);
 	hook_payload->channel = peer_active_channel(peer);

lightningd/test/run-invoice-select-inchan.c

@@ -78,7 +78,7 @@ struct command_result *command_success(struct command *cmd UNNEEDED,
 
 { fprintf(stderr, "command_success called!\n"); abort(); }
 /* Generated stub for connect_succeeded */
-void connect_succeeded(struct lightningd *ld UNNEEDED, const struct node_id *id UNNEEDED)
+void connect_succeeded(struct lightningd *ld UNNEEDED, const struct peer *peer UNNEEDED)
 { fprintf(stderr, "connect_succeeded called!\n"); abort(); }
 /* Generated stub for delay_then_reconnect */
 void delay_then_reconnect(struct channel *channel UNNEEDED, u32 seconds_delay UNNEEDED,

wallet/test/run-wallet.c

@@ -80,7 +80,7 @@ struct command_result *command_success(struct command *cmd UNNEEDED,
 
 { fprintf(stderr, "command_success called!\n"); abort(); }
 /* Generated stub for connect_succeeded */
-void connect_succeeded(struct lightningd *ld UNNEEDED, const struct node_id *id UNNEEDED)
+void connect_succeeded(struct lightningd *ld UNNEEDED, const struct peer *peer UNNEEDED)
 { fprintf(stderr, "connect_succeeded called!\n"); abort(); }
 /* Generated stub for create_onionreply */
 struct onionreply *create_onionreply(const tal_t *ctx UNNEEDED,