lightningd: peer_fail helper to fail/reconnect peer.

This will eventually hook into restart logic.

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

lightningd/gossip_control.c

@@ -38,9 +38,8 @@ static void peer_bad_message(struct subd *gossip, const u8 *msg)
 	log_debug(gossip->log, "Peer %s gave bad msg %s",
 		  type_to_string(msg, struct pubkey, peer->id),
 		  tal_hex(msg, msg));
-	peer_set_condition(peer, "Bad message %s during gossip phase",
-			   gossip_wire_type_name(fromwire_peektype(msg)));
-	tal_free(peer);
+	peer_fail(peer, "Bad message %s during gossip phase",
+		  gossip_wire_type_name(fromwire_peektype(msg)));
 }
 
 static void peer_failed(struct subd *gossip, const u8 *msg)
@@ -61,8 +60,7 @@ static void peer_failed(struct subd *gossip, const u8 *msg)
 	log_unusual(gossip->log, "Peer %s failed: %.*s",
 		    type_to_string(msg, struct pubkey, peer->id),
 		    (int)tal_len(err), (const char *)err);
-	peer_set_condition(peer, "Error during gossip phase");
-	tal_free(peer);
+	peer_fail(peer, "Error during gossip phase");
 }
 
 static void peer_nongossip(struct subd *gossip, const u8 *msg,

lightningd/peer_control.c

@@ -43,6 +43,18 @@ static void destroy_peer(struct peer *peer)
 			     peer->condition);
 }
 
+void peer_fail(struct peer *peer, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	log_unusual(peer->log, "Peer has failed: ");
+	logv(peer->log, -1, fmt, ap);
+	va_end(ap);
+
+	tal_free(peer);
+}
+
 void peer_set_condition(struct peer *peer, const char *fmt, ...)
 {
 	va_list ap;
@@ -169,8 +181,8 @@ static bool peer_got_handshake_hsmfd(struct subd *hsm, const u8 *msg,
 
 	assert(tal_count(fds) == 1);
 	if (!fromwire_hsmctl_hsmfd_ecdh_fd_reply(msg, NULL)) {
-		log_unusual(peer->ld->log, "Malformed hsmfd response: %s",
-			    tal_hex(peer, msg));
+		peer_fail(peer, "Malformed hsmfd response: %s",
+			  tal_hex(peer, msg));
 		goto error;
 	}
 
@@ -182,9 +194,8 @@ static bool peer_got_handshake_hsmfd(struct subd *hsm, const u8 *msg,
 			       NULL, NULL,
 			       fds[0], peer->fd, -1);
 	if (!peer->owner) {
-		log_unusual(peer->ld->log, "Could not subdaemon handshake: %s",
-			    strerror(errno));
-		peer_set_condition(peer, "Failed to subdaemon handshake");
+		peer_fail(peer, "Could not subdaemon handshake: %s",
+			  strerror(errno));
 		goto error;
 	}
 
@@ -207,7 +218,6 @@ static bool peer_got_handshake_hsmfd(struct subd *hsm, const u8 *msg,
 
 error:
 	close(fds[0]);
-	tal_free(peer);
 	return true;
 }
 
@@ -1391,8 +1401,7 @@ static bool peer_start_channeld_hsmfd(struct subd *hsm, const u8 *resp,
 	if (!cds->peer->owner) {
 		log_unusual(cds->peer->log, "Could not subdaemon channel: %s",
 			    strerror(errno));
-		peer_set_condition(cds->peer, "Failed to subdaemon channel");
-		tal_free(cds->peer);
+		peer_fail(cds->peer, "Failed to subdaemon channel");
 		return true;
 	}
 	cds->peer->fd = -1;
@@ -1672,8 +1681,8 @@ void peer_accept_open(struct peer *peer,
 	if (fromwire_peektype(from_peer) != WIRE_OPEN_CHANNEL) {
 		log_unusual(peer->log, "Strange message to exit gossip: %u",
 			    fromwire_peektype(from_peer));
-		peer_set_condition(peer, "Bad message during gossiping");
-		tal_free(peer);
+		peer_fail(peer, "Bad message during gossiping: %s",
+			  tal_hex(peer, from_peer));
 		return;
 	}
 
@@ -1683,10 +1692,8 @@ void peer_accept_open(struct peer *peer,
 			       NULL, NULL,
 			       peer->fd, -1);
 	if (!peer->owner) {
-		log_unusual(ld->log, "Could not subdaemon opening: %s",
-			    strerror(errno));
-		peer_set_condition(peer, "Failed to subdaemon opening");
-		tal_free(peer);
+		peer_fail(peer, "Failed to subdaemon opening: %s",
+			  strerror(errno));
 		return;
 	}
 	/* We handed off peer fd */
@@ -1716,8 +1723,7 @@ void peer_accept_open(struct peer *peer,
 
 	/* Careful here!  Their message could push us overlength! */
 	if (tal_len(msg) >= 65536) {
-		peer_set_condition(peer, "Unacceptably long open_channel");
-		tal_free(peer);
+		peer_fail(peer, "Unacceptably long open_channel");
 		return;
 	}
 	subd_req(peer, peer->owner, take(msg), -1, 0, opening_accept_reply, peer);
@@ -1756,10 +1762,8 @@ static bool gossip_peer_released(struct subd *gossip,
 			   NULL, NULL,
 			   fc->peer->fd, -1);
 	if (!opening) {
-		log_unusual(ld->log, "Could not subdaemon opening: %s",
-			    strerror(errno));
-		peer_set_condition(fc->peer, "Failed to subdaemon opening");
-		tal_free(fc->peer);
+		peer_fail(fc->peer, "Failed to subdaemon opening: %s",
+			  strerror(errno));
 		return true;
 	}
 	fc->peer->owner = opening;

lightningd/peer_control.h

@@ -76,6 +76,9 @@ struct peer *peer_from_json(struct lightningd *ld,
 void peer_accept_open(struct peer *peer,
 		      const struct crypto_state *cs, const u8 *msg);
 
+/* Peer has failed. */
+PRINTF_FMT(2,3) void peer_fail(struct peer *peer, const char *fmt, ...);
+
 PRINTF_FMT(2,3) void peer_set_condition(struct peer *peer, const char *fmt, ...);
 void setup_listeners(struct lightningd *ld);
 #endif /* LIGHTNING_LIGHTNINGD_PEER_CONTROL_H */

lightningd/peer_failed.c

@@ -30,6 +30,8 @@ void peer_failed(int peer_fd, struct crypto_state *cs,
 	va_start(ap, fmt);
 	errmsg = tal_vfmt(NULL, fmt, ap);
 	va_end(ap);
+	/* Make sure it's correct length for error. */
+	tal_resize(&errmsg, strlen(errmsg)+1);
 	msg = towire_error(errmsg, channel_id, (const u8 *)errmsg);
 
 	/* This is only best-effort; don't block. */