common: peer_billboard() helper for updating the billboard.

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

common/Makefile

@@ -25,6 +25,7 @@ COMMON_SRC_NOGEN :=				\
 	common/keyset.c				\
 	common/memleak.c			\
 	common/msg_queue.c			\
+	common/peer_billboard.c			\
 	common/peer_failed.c			\
 	common/permute_tx.c			\
 	common/ping.c				\

common/peer_billboard.c

@@ -0,0 +1,17 @@
+#include <ccan/tal/str/str.h>
+#include <common/gen_status_wire.h>
+#include <common/peer_billboard.h>
+#include <common/status.h>
+
+void peer_billboard(bool perm, const char *fmt, ...)
+{
+	va_list ap;
+	char *str;
+
+	va_start(ap, fmt);
+	str = tal_vfmt(NULL, fmt, ap);
+	va_end(ap);
+
+	status_send(take(towire_status_peer_billboard(NULL, perm, str)));
+	tal_free(str);
+}

common/peer_billboard.h

@@ -0,0 +1,9 @@
+#ifndef LIGHTNING_COMMON_PEER_BILLBOARD_H
+#define LIGHTNING_COMMON_PEER_BILLBOARD_H
+#include "config.h"
+#include <stdbool.h>
+
+/* Key information for RPC display: perm means it outlasts this daemon. */
+void peer_billboard(bool perm, const char *fmt, ...);
+
+#endif /* LIGHTNING_COMMON_PEER_BILLBOARD_H */

common/status.c

@@ -57,7 +57,7 @@ void status_setup_async(struct daemon_conn *master)
 	setup_logging_sighandler();
 }
 
-static void status_send(const u8 *msg TAKES)
+void status_send(const u8 *msg TAKES)
 {
 	if (status_fd >= 0) {
 		int type =fromwire_peektype(msg);

common/status.h

@@ -51,5 +51,6 @@ void status_failed(enum status_failreason code,
  * msg NULL == read failure. */
 void master_badmsg(u32 type_expected, const u8 *msg) NORETURN;
 
+void status_send(const u8 *msg TAKES);
 void status_send_fatal(const u8 *msg TAKES, int fd1, int fd2) NORETURN;
 #endif /* LIGHTNING_COMMON_STATUS_H */