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ab9d9ef3b8
(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>
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
#ifndef LIGHTNING_COMMON_READ_PEER_MSG_H
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#define LIGHTNING_COMMON_READ_PEER_MSG_H
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#include "config.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/tal/tal.h>
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#include <ccan/typesafe_cb/typesafe_cb.h>
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struct crypto_state;
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struct channel_id;
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/**
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* read_peer_msg - read & decode in a peer message, handling common ones.
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* @ctx: context to allocate return packet from.
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* @cs: the cryptostate (updated)
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* @chanid: the channel id (for identifying errors)
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* @send_reply: the way to send a reply packet (eg. sync_crypto_write_arg)
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* @io_error: what to do if there's an IO error (eg. status_fail_io)
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* (MUST NOT RETURN!)
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*
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* This returns NULL if it handled the message, so it's normally called in
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* a loop.
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*/
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#define read_peer_msg(ctx, cs, chanid, send_reply, io_error, arg) \
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read_peer_msg_((ctx), PEER_FD, GOSSIP_FD, (cs), \
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(chanid), \
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typesafe_cb_preargs(bool, void *, (send_reply), (arg), \
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struct crypto_state *, int, \
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const u8 *), \
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typesafe_cb(void, void *, (io_error), (arg)), \
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arg)
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/* Helper: sync_crypto_write, with extra args it ignores */
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bool sync_crypto_write_arg(struct crypto_state *cs, int fd, const u8 *TAKES,
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void *unused);
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/* Helper: calls peer_failed_connection_lost. */
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void status_fail_io(void *unused);
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u8 *read_peer_msg_(const tal_t *ctx,
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int peer_fd, int gossip_fd,
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struct crypto_state *cs,
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const struct channel_id *channel,
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bool (*send_reply)(struct crypto_state *cs, int fd,
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const u8 *TAKES, void *arg),
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void (*io_error)(void *arg),
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void *arg);
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#endif /* LIGHTNING_COMMON_READ_PEER_MSG_H */
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