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gossipd: drain fd instead of passing around gossip index.

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(This was sitting in my gossip-enchancement patch queue, but it simplifies
this set too, so I moved it here).

In 94711969f we added an explicit gossip_index so when gossipd gets
peers back from other daemons, it knows what gossip it has sent (since
gossipd can send gossip after the other daemon is already complete).

This solution is insufficient for the more general case where gossipd
wants to send other messages reliably, so replace it with the other
solution: have gossipd drain the "gossip fd" which the daemon returns.

This turns out to be quite simple, and is probably how I should have
done it originally :(

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2018-04-26 14:21:01 +09:30
parent 9430a455ff
commit ab9d9ef3b8
26 changed files with 118 additions and 223 deletions
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12
common/peer_failed.h
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@@ -9,23 +9,21 @@ struct channel_id;
/**
* peer_failed - Exit with error for peer.
* @cs: the peer's current crypto state.
* @gossip_index: the peer's current gossip_index.
* @channel_id: channel with error, or NULL for all.
* @fmt...: format as per status_failed(STATUS_FAIL_PEER_BAD)
*/
#define peer_failed(cs, gossip_index, channel_id, ...) \
peer_failed_(PEER_FD, GOSSIP_FD, (cs), (gossip_index), (channel_id), \
__VA_ARGS__)
#define peer_failed(cs, channel_id, ...) \
peer_failed_(PEER_FD, GOSSIP_FD, (cs), (channel_id), __VA_ARGS__)
void peer_failed_(int peer_fd, int gossip_fd,
struct crypto_state *cs, u64 gossip_index,
struct crypto_state *cs,
const struct channel_id *channel_id,
const char *fmt, ...)
PRINTF_FMT(6,7) NORETURN;
PRINTF_FMT(5,6) NORETURN;
/* We're failing because peer sent us an error message */
void peer_failed_received_errmsg(int peer_fd, int gossip_fd,
struct crypto_state *cs, u64 gossip_index,
struct crypto_state *cs,
const char *desc,
const struct channel_id *channel_id) NORETURN;