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connectd: add counters to each peer connection.

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This allows us to detect when lightningd hasn't seen our latest
disconnect/reconnect; in particular, we would hit the following pattern:

1. lightningd says to connect a subd.
2. connectd disconnects and reconnects.
3. connectd reads message, connects subd.
4. lightningd reads disconnect and reconnect, sends msg to connect to subd again.
5. connectd asserts because subd is alreacy connected.

This way connectd can tell if lightningd is talking about the previous
connection, and ignoere it.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2022-07-18 21:42:27 +09:30
committed by neil saitug
parent 41b379ed89
commit d31420211a
12 changed files with 82 additions and 30 deletions
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3
lightningd/connect_control.c
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@@ -662,7 +662,8 @@ void maybe_disconnect_peer(struct lightningd *ld, struct peer *peer)
* tell it to discard again: it might have reconnected! */
if (peer->connected == PEER_CONNECTED)
subd_send_msg(ld->connectd,
take(towire_connectd_discard_peer(NULL, &peer->id)));
take(towire_connectd_discard_peer(NULL, &peer->id,
peer->connectd_counter)));
}
static struct command_result *json_sendcustommsg(struct command *cmd,