lightningd: have optional node_id associated with subdaemons.

We'll use this for logging it.

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

lightningd/channel_control.c

@@ -353,6 +353,7 @@ void peer_start_channeld(struct channel *channel,
 	channel_set_owner(channel,
 			  new_channel_subd(ld,
 					   "lightning_channeld", channel,
+					   &channel->peer->id,
 					   channel->log, true,
 					   channel_wire_type_name,
 					   channel_msg,

lightningd/closing_control.c

@@ -195,7 +195,8 @@ void peer_start_closingd(struct channel *channel,
 	channel_set_owner(channel,
 			  new_channel_subd(ld,
 					   "lightning_closingd",
-					   channel, channel->log, true,
+					   channel, &channel->peer->id,
+					   channel->log, true,
 					   closing_wire_type_name, closing_msg,
 					   channel_errmsg,
 					   channel_set_billboard,

lightningd/onchain_control.c

@@ -471,7 +471,7 @@ enum watch_result onchaind_funding_spent(struct channel *channel,
 
 	channel_set_owner(channel, new_channel_subd(ld,
 						    "lightning_onchaind",
-						    channel,
+						    channel, &channel->peer->id,
 						    channel->log, false,
 						    onchain_wire_type_name,
 						    onchain_msg,

lightningd/opening_control.c

@@ -923,7 +923,7 @@ void peer_start_openingd(struct peer *peer,
 
 	uc->openingd = new_channel_subd(peer->ld,
 					"lightning_openingd",
-					uc, uc->log,
+					uc, &peer->id, uc->log,
 					true, opening_wire_type_name,
 					openingd_msg,
 					opening_channel_errmsg,

lightningd/subd.c

@@ -601,6 +601,7 @@ static struct io_plan *msg_setup(struct io_conn *conn, struct subd *sd)
 static struct subd *new_subd(struct lightningd *ld,
 			     const char *name,
 			     void *channel,
+			     const struct node_id *node_id,
 			     struct log *base_log,
 			     bool talks_to_peer,
 			     const char *(*msgname)(int msgtype),
@@ -658,6 +659,10 @@ static struct subd *new_subd(struct lightningd *ld,
 	tal_add_destructor(sd, destroy_subd);
 	list_head_init(&sd->reqs);
 	sd->channel = channel;
+	if (node_id)
+		sd->node_id = tal_dup(sd, struct node_id, node_id);
+	else
+		sd->node_id = NULL;
 
 	/* conn actually owns daemon: we die when it does. */
 	sd->conn = io_new_conn(ld, msg_fd, msg_setup, sd);
@@ -682,7 +687,7 @@ struct subd *new_global_subd(struct lightningd *ld,
 	struct subd *sd;
 
 	va_start(ap, msgcb);
-	sd = new_subd(ld, name, NULL, NULL, false, msgname, msgcb, NULL, NULL, &ap);
+	sd = new_subd(ld, name, NULL, NULL, NULL, false, msgname, msgcb, NULL, NULL, &ap);
 	va_end(ap);
 
 	sd->must_not_exit = true;
@@ -692,6 +697,7 @@ struct subd *new_global_subd(struct lightningd *ld,
 struct subd *new_channel_subd_(struct lightningd *ld,
 			       const char *name,
 			       void *channel,
+			       const struct node_id *node_id,
 			       struct log *base_log,
 			       bool talks_to_peer,
 			       const char *(*msgname)(int msgtype),
@@ -711,8 +717,8 @@ struct subd *new_channel_subd_(struct lightningd *ld,
 	struct subd *sd;
 
 	va_start(ap, billboardcb);
-	sd = new_subd(ld, name, channel, base_log, talks_to_peer, msgname,
-		      msgcb, errcb, billboardcb, &ap);
+	sd = new_subd(ld, name, channel, node_id, base_log, talks_to_peer,
+		      msgname, msgcb, errcb, billboardcb, &ap);
 	va_end(ap);
 	return sd;
 }

lightningd/subd.h

@@ -34,6 +34,7 @@ struct subd {
 
 	/* For logging */
 	struct log *log;
+	const struct node_id *node_id;
 
 	/* Callback when non-reply message comes in (inside db transaction) */
 	unsigned (*msgcb)(struct subd *, const u8 *, const int *);
@@ -97,6 +98,7 @@ struct subd *new_global_subd(struct lightningd *ld,
  * @ld: global state
  * @name: basename of daemon
  * @channel: channel to associate.
+ * @node_id: node_id of peer, for logging.
  * @base_log: log to use (actually makes a copy so it has name in prefix)
  * @msgname: function to get name from messages
  * @msgcb: function to call (inside db transaction) when non-fatal message received (or NULL)
@@ -112,6 +114,7 @@ struct subd *new_global_subd(struct lightningd *ld,
 struct subd *new_channel_subd_(struct lightningd *ld,
 			       const char *name,
 			       void *channel,
+			       const struct node_id *node_id,
 			       struct log *base_log,
 			       bool talks_to_peer,
 			       const char *(*msgname)(int msgtype),
@@ -127,9 +130,10 @@ struct subd *new_channel_subd_(struct lightningd *ld,
 						   const char *happenings),
 			       ...);
 
-#define new_channel_subd(ld, name, channel, log, talks_to_peer, msgname, \
-			 msgcb, errcb, billboardcb, ...)		\
-	new_channel_subd_((ld), (name), (channel), (log), (talks_to_peer), \
+#define new_channel_subd(ld, name, channel, node_id, log, talks_to_peer, \
+			 msgname, msgcb, errcb, billboardcb, ...)	\
+	new_channel_subd_((ld), (name), (channel), (node_id), (log),	\
+			  (talks_to_peer),				\
 			  (msgname), (msgcb),				\
 			  typesafe_cb_postargs(void, void *, (errcb),	\
 					       (channel),		\